Link to correct library

Improve API

.gitignore

@@ -54,3 +54,28 @@ pom.xml.asc
 /fixtures/*.db-shm
 /fixtures/*.db-wal
 /query-parser/out/
+## Build generated
+build/
+DerivedData
+build.xcarchive
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+/sdks/swift/Mentat/*.xcodeproj/project.xcworkspace/xcuserdata
+
+## Other
+*.xccheckout
+*.moved-aside
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa

ffi/Cargo.toml

@@ -1,10 +1,15 @@
 [package]
 name = "mentat_ffi"
-version = "0.1.0"
+version = "0.0.1"
 authors = ["Emily Toop <etoop@mozilla.com>"]
 
+[lib]
+name = "mentat_ffi"
+crate-type = ["lib", "staticlib", "cdylib"]
+
 [dependencies]
-libc = "0.2"
+libc = "0.2.32"
 
 [dependencies.mentat]
-path = ".."
+path = "../"
+

ffi/src/lib.rs

@@ -42,6 +42,7 @@ pub use mentat::{
     Syncable,
     TypedValue,
     TxObserver,
+    TxReport,
     Uuid,
     ValueType,
     Variable,
@@ -62,16 +63,23 @@ pub type TypedValueListIterator = vec::IntoIter<Vec<TypedValue>>;
 
 #[repr(C)]
 #[derive(Debug, Clone)]
-pub struct ExternTxReport {
+pub struct ExternTempId {
+    pub key: *const c_char,
+    pub value: i64,
+}
+
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct TransactionChange {
     pub txid: Entid,
-    pub changes: Box<[Entid]>,
     pub changes_len: usize,
+    pub changes: Box<[Entid]>,
 }
 
 #[repr(C)]
 #[derive(Debug)]
-pub struct ExternTxReportList {
-    pub reports: Box<[ExternTxReport]>,
+pub struct TxChangeList {
+    pub reports: Box<[TransactionChange]>,
     pub len: usize,
 }
 
@@ -137,6 +145,42 @@ pub extern "C" fn store_open(uri: *const c_char) -> *mut Store {
 
 // TODO: begin_transaction
 
+#[no_mangle]
+pub unsafe extern "C" fn store_transact(store: *mut Store, transaction: *const c_char) -> *mut ExternResult {
+    let store = &mut*store;
+    let transaction = c_char_to_string(transaction);
+    let result = store.begin_transaction().and_then(|mut in_progress| {
+        in_progress.transact(&transaction).and_then(|tx_report| {
+            in_progress.commit()
+                       .map(|_| tx_report)
+        })
+    });
+    Box::into_raw(Box::new(result.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tx_report_get_entid(tx_report: *mut TxReport) -> i64 {
+    let tx_report = &*tx_report;
+    tx_report.tx_id
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tx_report_get_tx_instant(tx_report: *mut TxReport) -> i64 {
+    let tx_report = &*tx_report;
+    tx_report.tx_instant.timestamp()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tx_report_entity_for_temp_id(tx_report: *mut TxReport, tempid: *const c_char) -> *mut i64 {
+    let tx_report = &*tx_report;
+    let key = c_char_to_string(tempid);
+    if let Some(entid) = tx_report.tempids.get(&key) {
+        Box::into_raw(Box::new(entid.clone()))
+    } else {
+        std::ptr::null_mut()
+    }
+}
+
 // TODO: cache
 
 // TODO: q_once
@@ -148,14 +192,6 @@ pub unsafe extern "C" fn store_query<'a>(store: *mut Store, query: *const c_char
     Box::into_raw(Box::new(query_builder))
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn query_builder_bind_int(query_builder: *mut QueryBuilder, var: *const c_char, value: c_int) {
-    let var = c_char_to_string(var);
-    let query_builder = &mut*query_builder;
-    let value = value as i32;
-    query_builder.bind_value(&var, value);
-}
-
 #[no_mangle]
 pub unsafe extern "C" fn query_builder_bind_long(query_builder: *mut QueryBuilder, var: *const c_char, value: i64) {
     let var = c_char_to_string(var);
@@ -281,9 +317,9 @@ pub unsafe extern "C" fn typed_value_as_kw(typed_value: *mut TypedValue) ->  *co
 
 //as_boolean
 #[no_mangle]
-pub unsafe extern "C" fn typed_value_as_boolean(typed_value: *mut TypedValue) ->  bool {
+pub unsafe extern "C" fn typed_value_as_boolean(typed_value: *mut TypedValue) -> i32 {
     let typed_value = Box::from_raw(typed_value);
-    typed_value.into_boolean().expect("Typed value cannot be coerced into a Boolean")
+    if typed_value.into_boolean().expect("Typed value cannot be coerced into a Boolean") { 1 } else { 0 }
 }
 
 //as_double
@@ -297,7 +333,8 @@ pub unsafe extern "C" fn typed_value_as_double(typed_value: *mut TypedValue) ->
 #[no_mangle]
 pub unsafe extern "C" fn typed_value_as_timestamp(typed_value: *mut TypedValue) ->  i64 {
     let typed_value = Box::from_raw(typed_value);
-    let val = typed_value.into_timestamp().expect("Typed value cannot be coerced into a Timestamp");
+    let t = typed_value.value_type();
+    let val = typed_value.into_timestamp().expect(&format!("Typed value of type {:?} cannot be coerced into a Timestamp", t));
     val
 }
 
@@ -315,6 +352,13 @@ pub unsafe extern "C" fn typed_value_as_uuid(typed_value: *mut TypedValue) ->  *
     string_to_c_char(typed_value.into_uuid_string().expect("Typed value cannot be coerced into a Uuid"))
 }
 
+//value_type
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_value_type(typed_value: *mut TypedValue) ->  ValueType {
+    let typed_value = &*typed_value;
+    typed_value.value_type()
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn row_at_index(rows: *mut Vec<Vec<TypedValue>>, index: c_int) ->  *mut Vec<TypedValue> {
     let result = &*rows;
@@ -340,9 +384,9 @@ pub unsafe extern "C" fn values_iter(values: *mut Vec<TypedValue>) ->  *mut Type
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn values_iter_next(iter: *mut TypedValueIterator) ->  *const TypedValue {
+pub unsafe extern "C" fn values_iter_next(iter: *mut TypedValueIterator) ->  *mut TypedValue {
     let iter = &mut *iter;
-    iter.next().map_or(std::ptr::null_mut(), |v| &v as *const TypedValue)
+    iter.next().map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v)))
 }
 
 //as_long
@@ -383,7 +427,7 @@ pub unsafe extern "C" fn values_iter_next_as_double(iter: *mut TypedValueIterato
 #[no_mangle]
 pub unsafe extern "C" fn values_iter_next_as_timestamp(iter: *mut TypedValueIterator) ->  *const i64 {
     let iter = &mut *iter;
-    iter.next().map_or(std::ptr::null_mut(), |v| v.into_timestamp().expect("Typed value cannot be coerced into a Timestamp") as *const i64)
+    iter.next().map_or(std::ptr::null_mut(), |v| { let t = v.value_type(); v.into_timestamp().expect(&format!("Typed value of type {:?} cannot be coerced into a Timestamp", t)) as *const i64 })
 }
 
 //as_string
@@ -469,12 +513,6 @@ pub unsafe extern "C" fn value_at_index_as_uuid(values: *mut Vec<TypedValue>, in
     string_to_c_char(value.clone().into_uuid_string().expect("Typed value cannot be coerced into a Uuid"))
 }
 
-// TODO: q_prepare
-
-// TODO: q_explain
-
-// TODO: lookup_values_for_attribute
-
 #[no_mangle]
 pub unsafe extern "C" fn store_value_for_attribute(store: *mut Store, entid: i64, attribute: *const c_char) ->  *mut ExternResult {
     let store = &*store;
@@ -492,24 +530,24 @@ pub unsafe extern "C" fn store_register_observer(store: *mut Store,
                                                    key: *const c_char,
                                             attributes: *const Entid,
                                         attributes_len: usize,
-                                              callback: extern fn(key: *const c_char, reports: &ExternTxReportList)) {
+                                              callback: extern fn(key: *const c_char, reports: &TxChangeList)) {
     let store = &mut*store;
     let mut attribute_set = BTreeSet::new();
     let slice = slice::from_raw_parts(attributes, attributes_len);
     attribute_set.extend(slice.iter());
     let key = c_char_to_string(key);
     let tx_observer = Arc::new(TxObserver::new(attribute_set, move |obs_key, batch| {
-        let extern_reports: Vec<ExternTxReport> = batch.into_iter().map(|(tx_id, changes)| {
+        let extern_reports: Vec<TransactionChange> = batch.into_iter().map(|(tx_id, changes)| {
             let changes: Vec<Entid> = changes.into_iter().map(|i|*i).collect();
             let len = changes.len();
-            ExternTxReport {
+            TransactionChange {
                 txid: *tx_id,
                 changes: changes.into_boxed_slice(),
                 changes_len: len,
             }
         }).collect();
         let len = extern_reports.len();
-        let reports = ExternTxReportList {
+        let reports = TxChangeList {
             reports: extern_reports.into_boxed_slice(),
             len: len,
         };
@@ -536,7 +574,7 @@ pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *con
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn tx_report_list_entry_at(tx_report_list: *mut ExternTxReportList, index: c_int) -> *const ExternTxReport {
+pub unsafe extern "C" fn tx_change_list_entry_at(tx_report_list: *mut TxChangeList, index: c_int) -> *const TransactionChange {
     let tx_report_list = &*tx_report_list;
     let index = index as usize;
     let report = Box::new(tx_report_list.reports[index].clone());
@@ -544,7 +582,7 @@ pub unsafe extern "C" fn tx_report_list_entry_at(tx_report_list: *mut ExternTxRe
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn changelist_entry_at(tx_report: *mut ExternTxReport, index: c_int) -> Entid {
+pub unsafe extern "C" fn changelist_entry_at(tx_report: *mut TransactionChange, index: c_int) -> Entid {
     let tx_report = &*tx_report;
     let index = index as usize;
     tx_report.changes[index].clone()
@@ -633,8 +671,7 @@ pub unsafe extern "C" fn store_set_uuid_for_attribute_on_entid(store: *mut Store
 #[no_mangle]
 pub unsafe extern "C" fn destroy(obj: *mut c_void) {
     if !obj.is_null() {
-        let obj_to_release = Box::from_raw(obj);
-        println!("object to release {:?}", obj_to_release);
+        let _ = Box::from_raw(obj);
     }
 }
 
@@ -650,6 +687,8 @@ define_destructor!(query_builder_destroy, QueryBuilder);
 
 define_destructor!(store_destroy, Store);
 
+define_destructor!(tx_report_destroy, TxReport);
+
 define_destructor!(typed_value_destroy, TypedValue);
 
 define_destructor!(typed_value_list_destroy, Vec<TypedValue>);

query-algebrizer/src/clauses/resolve.rs

@@ -45,12 +45,19 @@ impl ConjoiningClauses {
         use self::FnArg::*;
         match arg {
             FnArg::Variable(var) => {
+                match self.bound_value(&var) {
+                    // The type is already known if it's a bound variable….
+                    Some(TypedValue::Long(v)) => Ok(QueryValue::TypedValue(TypedValue::Long(v))),
+                    Some(TypedValue::Double(v)) => Ok(QueryValue::TypedValue(TypedValue::Double(v))),
+                    _ => {
                         self.constrain_var_to_numeric(var.clone());
                         self.column_bindings
                             .get(&var)
                             .and_then(|cols| cols.first().map(|col| QueryValue::Column(col.clone())))
                             .ok_or_else(|| Error::from_kind(ErrorKind::UnboundVariable(var.name())))
                     },
+                }
+            },
             // Can't be an entid.
             EntidOrInteger(i) => Ok(QueryValue::TypedValue(TypedValue::Long(i))),
             IdentOrKeyword(_) |
@@ -73,12 +80,18 @@ impl ConjoiningClauses {
         use self::FnArg::*;
         match arg {
             FnArg::Variable(var) => {
+                match self.bound_value(&var) {
+                    // The type is already known if it's a bound variable….
+                    Some(TypedValue::Instant(v)) => Ok(QueryValue::TypedValue(TypedValue::Instant(v))),
+                    _ => {
                         self.constrain_var_to_type(var.clone(), ValueType::Instant);
                         self.column_bindings
                             .get(&var)
                             .and_then(|cols| cols.first().map(|col| QueryValue::Column(col.clone())))
                             .ok_or_else(|| Error::from_kind(ErrorKind::UnboundVariable(var.name())))
                     },
+                }
+            },
             Constant(NonIntegerConstant::Instant(v)) => {
                 Ok(QueryValue::TypedValue(TypedValue::Instant(v)))
             },
@@ -144,11 +157,17 @@ impl ConjoiningClauses {
         use self::FnArg::*;
         match arg {
             FnArg::Variable(var) => {
+                match self.bound_value(&var) {
+                    // The type is already known if it's a bound variable….
+                    Some(v) => Ok(QueryValue::TypedValue(v)),
+                    None => {
                         self.column_bindings
                             .get(&var)
                             .and_then(|cols| cols.first().map(|col| QueryValue::Column(col.clone())))
                             .ok_or_else(|| Error::from_kind(ErrorKind::UnboundVariable(var.name())))
                     },
+                }
+            },
             EntidOrInteger(i) => Ok(QueryValue::PrimitiveLong(i)),
             IdentOrKeyword(_) => unimplemented!(),     // TODO
             Constant(NonIntegerConstant::Boolean(val)) => Ok(QueryValue::TypedValue(TypedValue::Boolean(val))),

query-algebrizer/tests/predicate.rs

@@ -17,7 +17,10 @@ mod utils;
 
 use mentat_core::{
     Attribute,
+    DateTime,
     Schema,
+    TypedValue,
+    Utc,
     ValueType,
     ValueTypeSet,
 };
@@ -32,11 +35,13 @@ use mentat_query_algebrizer::{
     EmptyBecause,
     ErrorKind,
     Known,
+    QueryInputs,
 };
 
 use utils::{
     add_attribute,
     alg,
+    alg_with_inputs,
     associate_ident,
     bails,
 };
@@ -45,6 +50,7 @@ fn prepopulated_schema() -> Schema {
     let mut schema = Schema::default();
     associate_ident(&mut schema, NamespacedKeyword::new("foo", "date"), 65);
     associate_ident(&mut schema, NamespacedKeyword::new("foo", "double"), 66);
+    associate_ident(&mut schema, NamespacedKeyword::new("foo", "long"), 67);
     add_attribute(&mut schema, 65, Attribute {
         value_type: ValueType::Instant,
         multival: false,
@@ -55,6 +61,11 @@ fn prepopulated_schema() -> Schema {
         multival: false,
         ..Default::default()
     });
+    add_attribute(&mut schema, 67, Attribute {
+        value_type: ValueType::Long,
+        multival: false,
+        ..Default::default()
+    });
     schema
 }
 
@@ -116,3 +127,60 @@ fn test_instant_predicates_require_instants() {
     assert_eq!(cc.known_type(&Variable::from_valid_name("?t")).expect("?t is known"),
                ValueType::Double);
 }
+
+#[test]
+fn test_instant_predicates_accepts_var() {
+    let schema = prepopulated_schema();
+    let known = Known::for_schema(&schema);
+
+    let instant_var = Variable::from_valid_name("?time");
+    let instant_value = TypedValue::Instant(DateTime::parse_from_rfc3339("2018-04-11T19:17:00.000Z")
+                    .map(|t| t.with_timezone(&Utc))
+                    .expect("expected valid date"));
+
+    let query = r#"[:find ?e
+                    :in ?time
+                    :where
+                    [?e :foo/date ?t]
+                    [(< ?t ?time)]]"#;
+    let cc = alg_with_inputs(known, query, QueryInputs::with_value_sequence(vec![(instant_var.clone(), instant_value.clone())]));
+    assert_eq!(cc.known_type(&instant_var).expect("?time is known"),
+               ValueType::Instant);
+
+    let query = r#"[:find ?e
+                    :in ?time
+                    :where
+                    [?e :foo/date ?t]
+                    [(> ?time, ?t)]]"#;
+    let cc = alg_with_inputs(known, query, QueryInputs::with_value_sequence(vec![(instant_var.clone(), instant_value.clone())]));
+    assert_eq!(cc.known_type(&instant_var).expect("?time is known"),
+               ValueType::Instant);
+}
+
+#[test]
+fn test_numeric_predicates_accepts_var() {
+    let schema = prepopulated_schema();
+    let known = Known::for_schema(&schema);
+
+    let numeric_var = Variable::from_valid_name("?long");
+    let numeric_value = TypedValue::Long(1234567);
+
+    // You can't use a string for an inequality: this is a straight-up error.
+    let query = r#"[:find ?e
+                    :in ?long
+                    :where
+                    [?e :foo/long ?t]
+                    [(> ?t ?long)]]"#;
+    let cc = alg_with_inputs(known, query, QueryInputs::with_value_sequence(vec![(numeric_var.clone(), numeric_value.clone())]));
+    assert_eq!(cc.known_type(&numeric_var).expect("?long is known"),
+               ValueType::Long);
+
+    let query = r#"[:find ?e
+                    :in ?long
+                    :where
+                    [?e :foo/long ?t]
+                    [(> ?long, ?t)]]"#;
+    let cc = alg_with_inputs(known, query, QueryInputs::with_value_sequence(vec![(numeric_var.clone(), numeric_value.clone())]));
+    assert_eq!(cc.known_type(&numeric_var).expect("?long is known"),
+               ValueType::Long);
+}

query-algebrizer/tests/utils/mod.rs

@@ -98,3 +98,8 @@ pub fn alg(known: Known, input: &str) -> ConjoiningClauses {
     let parsed = parse_find_string(input).expect("query input to have parsed");
     algebrize(known, parsed).expect("algebrizing to have succeeded").cc
 }
+
+pub fn alg_with_inputs(known: Known, input: &str, inputs: QueryInputs) -> ConjoiningClauses {
+    let parsed = parse_find_string(input).expect("query input to have parsed");
+    algebrize_with_inputs(known, parsed, 0, inputs).expect("algebrizing to have succeeded").cc
+}

sdks/swift/Mentat/Mentat.xcodeproj/project.pbxproj

@@ -0,0 +1,593 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 50;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		7BDB96942077C299009D0651 /* Mentat.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 7BDB968A2077C299009D0651 /* Mentat.framework */; };
+		7BDB96992077C299009D0651 /* MentatTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BDB96982077C299009D0651 /* MentatTests.swift */; };
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+		7BDB96AF2077C38E009D0651 /* Query.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BDB96A62077C38D009D0651 /* Query.swift */; };
+		7BDB96B02077C38E009D0651 /* Mentat.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BDB96A72077C38D009D0651 /* Mentat.swift */; };
+		7BDB96B12077C38E009D0651 /* store.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BDB96A82077C38E009D0651 /* store.h */; };
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+		7BEB7D2C207D03DA000369AD /* TxReport.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BEB7D2B207D03DA000369AD /* TxReport.swift */; };
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+/* End PBXBuildFile section */
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+			proxyType = 1;
+			remoteGlobalIDString = 7BDB96892077C299009D0651;
+			remoteInfo = Mentat;
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+/* End PBXContainerItemProxy section */
+
+/* Begin PBXFileReference section */
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+		7BDB968D2077C299009D0651 /* Mentat.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Mentat.h; sourceTree = "<group>"; };
+		7BDB968E2077C299009D0651 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		7BDB96932077C299009D0651 /* MentatTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = MentatTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		7BDB96982077C299009D0651 /* MentatTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MentatTests.swift; sourceTree = "<group>"; };
+		7BDB969A2077C299009D0651 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		7BDB96A62077C38D009D0651 /* Query.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Query.swift; sourceTree = "<group>"; };
+		7BDB96A72077C38D009D0651 /* Mentat.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Mentat.swift; sourceTree = "<group>"; };
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+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = 8BHJ767F4Y;
+				INFOPLIST_FILE = MentatTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.mozilla.MentatTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 4.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		7BDB96A32077C299009D0651 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = 8BHJ767F4Y;
+				INFOPLIST_FILE = MentatTests/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.mozilla.MentatTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 4.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		7BDB96842077C299009D0651 /* Build configuration list for PBXProject "Mentat" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				7BDB969C2077C299009D0651 /* Debug */,
+				7BDB969D2077C299009D0651 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		7BDB969E2077C299009D0651 /* Build configuration list for PBXNativeTarget "Mentat" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				7BDB969F2077C299009D0651 /* Debug */,
+				7BDB96A02077C299009D0651 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		7BDB96A12077C299009D0651 /* Build configuration list for PBXNativeTarget "MentatTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				7BDB96A22077C299009D0651 /* Debug */,
+				7BDB96A32077C299009D0651 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 7BDB96812077C299009D0651 /* Project object */;
+}

sdks/swift/Mentat/Mentat.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:Mentat.xcodeproj">
+   </FileRef>
+</Workspace>

sdks/swift/Mentat/Mentat.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

sdks/swift/Mentat/Mentat.xcodeproj/xcshareddata/xcschemes/Mentat Debug.xcscheme

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0930"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7BDB96892077C299009D0651"
+               BuildableName = "Mentat.framework"
+               BlueprintName = "Mentat"
+               ReferencedContainer = "container:Mentat.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7BDB96922077C299009D0651"
+               BuildableName = "MentatTests.xctest"
+               BlueprintName = "MentatTests"
+               ReferencedContainer = "container:Mentat.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

sdks/swift/Mentat/Mentat.xcodeproj/xcshareddata/xcschemes/Mentat.xcscheme

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0930"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7BDB96892077C299009D0651"
+               BuildableName = "Mentat.framework"
+               BlueprintName = "Mentat"
+               ReferencedContainer = "container:Mentat.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7BDB96922077C299009D0651"
+               BuildableName = "MentatTests.xctest"
+               BlueprintName = "MentatTests"
+               ReferencedContainer = "container:Mentat.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Release"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "7BDB96892077C299009D0651"
+            BuildableName = "Mentat.framework"
+            BlueprintName = "Mentat"
+            ReferencedContainer = "container:Mentat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

sdks/swift/Mentat/Mentat.xcodeproj/xcuserdata/emilytoop.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>Mentat Debug.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+		<key>Mentat.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>1</integer>
+		</dict>
+	</dict>
+	<key>SuppressBuildableAutocreation</key>
+	<dict>
+		<key>7BDB96892077C299009D0651</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+		<key>7BDB96922077C299009D0651</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+	</dict>
+</dict>
+</plist>

sdks/swift/Mentat/Mentat/Core/TypedValue.swift

@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+class TypedValue: OptionalRustObject {
+
+    var valueType: ValueType {
+        return typed_value_value_type(self.raw!)
+    }
+
+    func asLong() -> Int64 {
+        defer {
+            self.raw = nil
+        }
+        return typed_value_as_long(self.raw!)
+    }
+
+    func asEntid() -> Int64 {
+        defer {
+            self.raw = nil
+        }
+        return typed_value_as_entid(self.raw!)
+    }
+
+    func asKeyword() -> String {
+        defer {
+            self.raw = nil
+        }
+        return String(cString: typed_value_as_kw(self.raw!))
+    }
+
+    func asBool() -> Bool {
+        defer {
+            self.raw = nil
+        }
+        let v = typed_value_as_boolean(self.raw!)
+        return  v > 0
+    }
+
+    func asDouble() -> Double {
+        defer {
+            self.raw = nil
+        }
+        return typed_value_as_double(self.raw!)
+    }
+
+    func asDate() -> Date {
+        defer {
+            self.raw = nil
+        }
+        let timestamp = typed_value_as_timestamp(self.raw!)
+        return Date(timeIntervalSince1970: TimeInterval(timestamp))
+    }
+
+    func asString() -> String {
+        defer {
+            self.raw = nil
+        }
+        return String(cString: typed_value_as_string(self.raw!))
+    }
+
+    func asUUID() -> UUID? {
+        defer {
+            self.raw = nil
+        }
+        return UUID(uuidString: String(cString: typed_value_as_uuid(self.raw!)))
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        typed_value_destroy(pointer)
+    }
+}

sdks/swift/Mentat/Mentat/Errors/Errors.swift

@@ -0,0 +1,20 @@
+//
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+
+public enum QueryError: Error {
+    case builderConsumed
+    case invalidKeyword(message: String)
+    case executionFailed(message: String)
+}
+
+public enum QueryResultError: Error {
+    case resultsConsumed
+}
+
+public struct MentatError: Error {
+    let message: String
+}

sdks/swift/Mentat/Mentat/Extensions/Date+Int64.swift

@@ -0,0 +1,11 @@
+///* This Source Code Form is subject to the terms of the Mozilla Public
+// * License, v. 2.0. If a copy of the MPL was not distributed with this
+// * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+
+extension Date {
+    func toMicroseconds() -> Int64 {
+        return Int64(self.timeIntervalSince1970 * 1_000_000)
+    }
+}

sdks/swift/Mentat/Mentat/Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

sdks/swift/Mentat/Mentat/Mentat.h

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for Mentat.
+FOUNDATION_EXPORT double MentatVersionNumber;
+
+//! Project version string for Mentat.
+FOUNDATION_EXPORT const unsigned char MentatVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <Mentat/PublicHeader.h>
+

sdks/swift/Mentat/Mentat/Mentat.swift

@@ -0,0 +1,188 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+
+import Mentatlib
+
+protocol Observing {
+    // define functions for store observation
+    func transactionDidOccur(key: String, reports: [TransactionChange])
+}
+
+protocol Observable {
+    func register(key: String, observer: Observing, attributes: [String])
+    func unregister(key: String)
+}
+
+class Mentat: RustObject {
+    fileprivate static var observers = [String: Observing]()
+
+    required override init(raw: OpaquePointer) {
+        super.init(raw: raw)
+    }
+
+    convenience init(storeURI: String = "") {
+        self.init(raw: store_open(storeURI))
+    }
+
+    func transact(transaction: String) throws -> TxReport {
+        let result = store_transact(self.raw, transaction).pointee
+        guard let success = result.ok else {
+            if let error = result.err {
+                throw MentatError(message: String(cString: error))
+            }
+            throw MentatError(message: "Unspecified Error")
+        }
+        return TxReport(raw: success)
+    }
+
+    func entidForAttribute(attribute: String) -> Int64 {
+        return Int64(store_entid_for_attribute(self.raw, attribute))
+    }
+
+    func sync_now() -> Bool {
+        let err = store_sync(self.raw, "00000000-0000-0000-0000-000000000117", "http://mentat.dev.lcip.org/mentatsync/0.1")
+        if let error = err.pointee.err {
+            let str = String(cString: error)
+            print("Sync error \(str)")
+            return false
+        }
+
+        return true
+    }
+
+    func query(query: String) -> Query {
+        return Query(raw: store_query(self.raw, query))
+    }
+
+    func value(forAttribute attribute: String, ofEntity entid: Int64) -> TypedValue? {
+        let result = store_value_for_attribute(self.raw, entid, attribute).pointee
+        guard let success = result.ok else {
+            if let error = result.err {
+                let str = String(cString: error)
+                print("Error: \(str)")
+            }
+            return nil
+        }
+        return TypedValue(raw: success)
+    }
+
+    func set(date value: Date, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_timestamp_for_attribute_on_entid(self.intoRaw(), entid, attribute, value.toMicroseconds())
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(long value: Int64, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_long_for_attribute_on_entid(self.intoRaw(), entid, attribute, value)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(reference value: Int64, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_entid_for_attribute_on_entid(self.intoRaw(), entid, attribute, value)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func setKeywordReference(value: String, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_kw_ref_for_attribute_on_entid(self.intoRaw(), entid, attribute, value)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(boolean value: Bool, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_boolean_for_attribute_on_entid(self.intoRaw(), entid, attribute, value ? 1 : 0)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(double value: Double, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_double_for_attribute_on_entid(self.intoRaw(), entid, attribute, value)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(string value: String, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_string_for_attribute_on_entid(self.intoRaw(), entid, attribute, value)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    func set(uuid value: UUID, forAttribute attribute: String, onEntity entid: Int64) throws {
+        let result = store_set_uuid_for_attribute_on_entid(self.intoRaw(), entid, attribute, value.uuidString)
+        guard let err = result.pointee.err else {
+            return
+        }
+
+        throw QueryError.executionFailed(message: String(cString: err))
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        store_destroy(pointer)
+    }
+}
+
+extension Mentat: Observable {
+    func register(key: String, observer: Observing, attributes: [String]) {
+        let attrEntIds = attributes.map({ (kw) -> Int64 in
+            let entid = Int64(self.entidForAttribute(attribute: kw));
+            return entid
+        })
+
+        let ptr = UnsafeMutablePointer<Int64>.allocate(capacity: attrEntIds.count)
+        let entidPointer = UnsafeMutableBufferPointer(start: ptr, count: attrEntIds.count)
+        var _ = entidPointer.initialize(from: attrEntIds)
+
+        guard let firstElement = entidPointer.baseAddress else {
+            return
+        }
+        Mentat.observers[key] = observer
+        store_register_observer(self.raw, key, firstElement, Int64(attributes.count), transactionObserverCallback)
+
+    }
+
+    func unregister(key: String) {
+        store_unregister_observer(self.raw, key)
+    }
+}
+
+private func transactionObserverCallback(key: UnsafePointer<CChar>, reports: UnsafePointer<TxChangeList>) {
+    // needs to be done in the same thread as the calling thread otherwise the TxReportList might be released before
+    // we can reference it.
+    let key = String(cString: key)
+    guard let observer = Mentat.observers[key] else { return }
+
+//    let len = Int(reports.pointee.len)
+//    var txReports = [TxReport]()
+//    for i in 0..<len {
+//        guard let report = tx_report_list_entry_at(reports, i)?.pointee else { continue }
+//        txReports.append(TxReport(raw: report))
+//    }
+    DispatchQueue.global(qos: .background).async {
+        observer.transactionDidOccur(key: key, reports: [TransactionChange]())
+    }
+}

sdks/swift/Mentat/Mentat/Query/Query.swift

@@ -0,0 +1,218 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+class Query: OptionalRustObject {
+
+    func bind(varName: String, toLong value: Int64) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_long(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toReference value: Int64) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_ref(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toReference value: String) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_ref_kw(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toKeyword value: String) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_kw(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toBoolean value: Bool) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_boolean(r, varName, value ? 1 : 0)
+        return self
+    }
+
+    func bind(varName: String, toDouble value: Double) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_double(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toDate value: Date) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_timestamp(r, varName, value.toMicroseconds())
+        return self
+    }
+
+    func bind(varName: String, toString value: String) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_string(r, varName, value)
+        return self
+    }
+
+    func bind(varName: String, toUuid value: UUID) throws -> Query {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+        query_builder_bind_uuid(r, varName, value.uuidString)
+        return self
+    }
+
+    func executeMap(map: @escaping (TupleResult?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                map(nil, QueryError.executionFailed(message: message))
+                return
+            }
+            guard let rowsPtr = result.pointee.ok else {
+                return
+            }
+            let rows = RelResult(raw: rowsPtr)
+            for row in rows {
+                map(row, nil)
+            }
+        }
+    }
+
+    func execute(callback: @escaping (RelResult?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                callback(nil, QueryError.executionFailed(message: message))
+                return
+            }
+            guard let results = result.pointee.ok else {
+                callback(nil, nil)
+                return
+            }
+            callback(RelResult(raw: results), nil)
+        }
+    }
+
+    func executeScalar(callback: @escaping (TypedValue?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute_scalar(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                callback(nil, QueryError.executionFailed(message: message))
+            }
+            guard let results = result.pointee.ok else {
+                callback(nil, nil)
+                return
+            }
+            callback(TypedValue(raw: OpaquePointer(results)), nil)
+        }
+    }
+
+    func executeColl(callback: @escaping (ColResult?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute_coll(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                callback(nil, QueryError.executionFailed(message: message))
+            }
+            guard let results = result.pointee.ok else {
+                callback(nil, nil)
+                return
+            }
+            callback(ColResult(raw: results), nil)
+        }
+    }
+
+    func executeCollMap(map: @escaping (TypedValue?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                map(nil, QueryError.executionFailed(message: message))
+                return
+            }
+            guard let cols = result.pointee.ok else {
+                return
+            }
+            let rowList = ColResult(raw: cols)
+            for row in rowList {
+                map(row, nil)
+            }
+        }
+    }
+
+    func executeTuple(callback: @escaping (TupleResult?, QueryError?) -> Void) throws {
+        guard let r = self.raw else {
+            throw QueryError.builderConsumed
+        }
+
+        DispatchQueue.global(qos: .background).async {
+            let result = query_builder_execute_tuple(r)
+            self.raw = nil
+
+            if let err = result.pointee.err {
+                let message = String(cString: err)
+                callback(nil, QueryError.executionFailed(message: message))
+            }
+            guard let results = result.pointee.ok else {
+                callback(nil, nil)
+                return
+            }
+            callback(TupleResult(raw: OpaquePointer(results)), nil)
+        }
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        query_builder_destroy(pointer)
+    }
+}

sdks/swift/Mentat/Mentat/Query/RelResult.swift

@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+class RelResult: OptionalRustObject {
+    private func getRaw() throws -> OpaquePointer {
+        guard let r = self.raw else {
+            throw QueryResultError.resultsConsumed
+        }
+        return r
+    }
+
+    func row(index: Int32) throws -> TupleResult? {
+        guard let row = row_at_index(try self.getRaw(), index) else {
+            return nil
+        }
+        return TupleResult(raw: row)
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        destroy(UnsafeMutableRawPointer(pointer))
+    }
+}
+
+class RelResultIterator: OptionalRustObject, IteratorProtocol  {
+    typealias Element = TupleResult
+
+    init(iter: OpaquePointer?) {
+        super.init(raw: iter)
+    }
+
+    func next() -> Element? {
+        guard let iter = self.raw,
+            let rowPtr = rows_iter_next(iter) else {
+            return nil
+        }
+        return TupleResult(raw: rowPtr)
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        typed_value_result_set_iter_destroy(pointer)
+    }
+}
+
+extension RelResult: Sequence {
+    func makeIterator() -> RelResultIterator {
+        do {
+            let rowIter = rows_iter(try self.getRaw())
+            self.raw = nil
+            return RelResultIterator(iter: rowIter)
+        } catch {
+            return RelResultIterator(iter: nil)
+        }
+    }
+}

sdks/swift/Mentat/Mentat/Query/TupleResult.swift

@@ -0,0 +1,85 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+class TupleResult: OptionalRustObject {
+
+    func get(index: Int) -> TypedValue {
+        return TypedValue(raw: value_at_index(self.raw!, Int32(index)))
+    }
+
+    func asLong(index: Int) -> Int64 {
+        return value_at_index_as_long(self.raw!, Int32(index))
+    }
+
+    func asEntid(index: Int) -> Int64 {
+        return value_at_index_as_entid(self.raw!, Int32(index))
+    }
+
+    func asKeyword(index: Int) -> String {
+        return String(cString: value_at_index_as_kw(self.raw!, Int32(index)))
+    }
+
+    func asBool(index: Int) -> Bool {
+        return value_at_index_as_boolean(self.raw!, Int32(index)) == 0 ? false : true
+    }
+
+    func asDouble(index: Int) -> Double {
+        return value_at_index_as_double(self.raw!, Int32(index))
+    }
+
+    func asDate(index: Int) -> Date {
+        return Date(timeIntervalSince1970: TimeInterval(value_at_index_as_timestamp(self.raw!, Int32(index))))
+    }
+
+    func asString(index: Int) -> String {
+        return String(cString: value_at_index_as_string(self.raw!, Int32(index)))
+    }
+
+    func asUUID(index: Int) -> UUID? {
+        return UUID(uuidString: String(cString: value_at_index_as_uuid(self.raw!, Int32(index))))
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        typed_value_list_destroy(pointer)
+    }
+}
+
+class ColResult: TupleResult {
+}
+
+class ColResultIterator: OptionalRustObject, IteratorProtocol  {
+    typealias Element = TypedValue
+
+    init(iter: OpaquePointer?) {
+        super.init(raw: iter)
+    }
+
+    func next() -> Element? {
+        guard let iter = self.raw,
+            let rowPtr = values_iter_next(iter) else {
+                return nil
+        }
+        return TypedValue(raw: rowPtr)
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        typed_value_list_iter_destroy(pointer)
+    }
+}
+
+extension ColResult: Sequence {
+    func makeIterator() -> ColResultIterator {
+        defer {
+            self.raw = nil
+        }
+        guard let raw = self.raw else {
+            return ColResultIterator(iter: nil)
+        }
+        let rowIter = values_iter(raw)
+        return ColResultIterator(iter: rowIter)
+    }
+}

sdks/swift/Mentat/Mentat/Rust/OptionalRustObject.swift

@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+class OptionalRustObject: Destroyable {
+    var raw: OpaquePointer?
+    lazy var uniqueId: ObjectIdentifier = {
+         ObjectIdentifier(self)
+    }()
+
+    init(raw: UnsafeMutableRawPointer) {
+        self.raw = OpaquePointer(raw)
+    }
+
+    init(raw: OpaquePointer?) {
+        self.raw = raw
+    }
+
+    func intoRaw() -> OpaquePointer? {
+        return self.raw
+    }
+
+    deinit {
+        guard let raw = self.raw else { return }
+        self.cleanup(pointer: raw)
+    }
+
+    func cleanup(pointer: OpaquePointer) {
+        fatalError("\(cleanup) is not implemented.")
+    }
+}
+

sdks/swift/Mentat/Mentat/Rust/RustObject.swift

@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Mentatlib
+
+protocol Destroyable {
+    func cleanup(pointer: OpaquePointer)
+}
+
+public class RustObject: Destroyable {
+    var raw: OpaquePointer
+
+    lazy var uniqueId: ObjectIdentifier = {
+        ObjectIdentifier(self)
+    }()
+
+    init(raw: OpaquePointer) {
+        self.raw = raw
+    }
+
+    init(raw: UnsafeMutableRawPointer) {
+        self.raw = OpaquePointer(raw)
+    }
+
+    init?(raw: OpaquePointer?) {
+        guard let r = raw else {
+            return nil
+        }
+        self.raw = r
+    }
+
+    func intoRaw() -> OpaquePointer {
+        return self.raw
+    }
+
+    deinit {
+        self.cleanup(pointer: self.raw)
+    }
+    
+    func cleanup(pointer: OpaquePointer) {
+        fatalError("\(cleanup) is not implemented.")
+    }
+}

sdks/swift/Mentat/Mentat/Transact/TxReport.swift

@@ -0,0 +1,30 @@
+//
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+
+import Mentatlib
+
+class TxReport: RustObject {
+
+    public var txId: Int64 {
+        return tx_report_get_entid(self.raw)
+    }
+
+    public var txInstant: Date {
+        return Date(timeIntervalSince1970: TimeInterval(tx_report_get_tx_instant(self.raw)))
+    }
+
+    public func entidForTmpId(tmpId: String) -> Int64? {
+        guard let entidPtr = tx_report_entity_for_temp_id(self.raw, tmpId) else {
+            return nil
+        }
+        return entidPtr.pointee
+    }
+
+    override func cleanup(pointer: OpaquePointer) {
+        tx_report_destroy(pointer)
+    }
+}

sdks/swift/Mentat/Mentat/module.map

@@ -0,0 +1,4 @@
+module Mentatlib [system][extern_c] {
+    header "store.h"
+    export *
+}

sdks/swift/Mentat/Mentat/store.h

@@ -0,0 +1,151 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef store_h
+#define store_h
+#include <stdint.h>
+#include <Foundation/NSObjCRuntime.h>
+
+struct TransactionChange {
+    int64_t txid;
+    int64_t*_Nonnull* _Nonnull changes;
+    uint64_t len;
+};
+
+struct TxChangeList {
+    struct TransactionChange*_Nonnull* _Nonnull reports;
+    uint64_t len;
+};
+typedef struct TxChangeList TxChangeList;
+
+struct Result {
+    void* _Nullable ok;
+    char* _Nullable err;
+};
+typedef struct Result Result;
+
+struct Option {
+    void* _Nullable value;
+};
+typedef struct Option Option;
+
+typedef NS_ENUM(NSInteger, ValueType) {
+    ValueTypeRef = 1,
+    ValueTypeBoolean,
+    ValueTypeInstant,
+    ValueTypeLong,
+    ValueTypeDouble,
+    ValueTypeString,
+    ValueTypeKeyword,
+    ValueTypeUuid
+};
+
+struct Query;
+struct QueryResultRow;
+struct QueryResultRows;
+struct QueryRowsIterator;
+struct QueryRowIterator;
+struct Store;
+struct TxReport;
+struct TypedValue;
+
+// Store
+struct Store*_Nonnull store_open(const char*_Nonnull uri);
+
+void destroy(void* _Nullable obj);
+void query_builder_destroy(struct Query* _Nullable obj);
+void store_destroy(struct Store* _Nonnull obj);
+void tx_report_destroy(struct TxReport* _Nonnull obj);
+void typed_value_destroy(struct TypedValue* _Nullable obj);
+void typed_value_list_destroy(struct QueryResultRow* _Nullable obj);
+void typed_value_list_iter_destroy(struct QueryRowIterator* _Nullable obj);
+void typed_value_result_set_destroy(struct QueryResultRows* _Nullable obj);
+void typed_value_result_set_iter_destroy(struct QueryRowsIterator* _Nullable obj);
+
+// transact
+struct Result*_Nonnull store_transact(struct Store*_Nonnull store, const char* _Nonnull transaction);
+const int64_t* _Nullable tx_report_entity_for_temp_id(const struct TxReport* _Nonnull report, const char* _Nonnull tempid);
+int64_t tx_report_get_entid(const struct TxReport* _Nonnull report);
+int64_t tx_report_get_tx_instant(const struct TxReport* _Nonnull report);
+
+// Sync
+struct Result*_Nonnull store_sync(struct Store*_Nonnull store, const char* _Nonnull user_uuid, const char* _Nonnull server_uri);
+
+// Observers
+void store_register_observer(struct Store*_Nonnull  store, const char* _Nonnull key, const int64_t* _Nonnull attributes, const int64_t len, void (*_Nonnull callback_fn)(const char* _Nonnull key, const struct TxChangeList* _Nonnull reports));
+void store_unregister_observer(struct Store*_Nonnull  store, const char* _Nonnull key);
+int64_t store_entid_for_attribute(struct Store*_Nonnull store, const char*_Nonnull attr);
+int64_t changelist_entry_at(const struct TransactionChange* _Nonnull report, size_t index);
+
+// Query
+struct Query*_Nonnull store_query(struct Store*_Nonnull store, const char* _Nonnull query);
+struct Result*_Nonnull store_value_for_attribute(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute);
+
+// Query Variable Binding
+void query_builder_bind_int(struct Store*_Nonnull store, const char* _Nonnull var, const int32_t value);
+void query_builder_bind_long(struct Query*_Nonnull query, const char* _Nonnull var, const int64_t value);
+void query_builder_bind_ref(struct Query*_Nonnull query, const char* _Nonnull var, const int64_t value);
+void query_builder_bind_ref_kw(struct Query*_Nonnull query, const char* _Nonnull var, const char* _Nonnull value);
+void query_builder_bind_kw(struct Query*_Nonnull query, const char* _Nonnull var, const char* _Nonnull value);
+void query_builder_bind_boolean(struct Query*_Nonnull query, const char* _Nonnull var, const int32_t value);
+void query_builder_bind_double(struct Query*_Nonnull query, const char* _Nonnull var, const double value);
+void query_builder_bind_timestamp(struct Query*_Nonnull query, const char* _Nonnull var, const int64_t value);
+void query_builder_bind_string(struct Query*_Nonnull query, const char* _Nonnull var, const char* _Nonnull value);
+void query_builder_bind_uuid(struct Query*_Nonnull query, const char* _Nonnull var, const char* _Nonnull value);
+
+// Query execution
+struct Result*_Nonnull query_builder_execute(struct Query*_Nonnull query);
+struct Result*_Nonnull query_builder_execute_scalar(struct Query*_Nonnull query);
+struct Result*_Nonnull query_builder_execute_coll(struct Query*_Nonnull query);
+struct Result*_Nonnull query_builder_execute_tuple(struct Query*_Nonnull query);
+
+// Query Result Processing
+int64_t typed_value_as_long(struct TypedValue*_Nonnull  value);
+int64_t typed_value_as_entid(struct TypedValue*_Nonnull  value);
+const char* _Nonnull typed_value_as_kw(struct TypedValue*_Nonnull  value);
+int32_t typed_value_as_boolean(struct TypedValue*_Nonnull  value);
+double typed_value_as_double(struct TypedValue*_Nonnull  value);
+int64_t typed_value_as_timestamp(struct TypedValue*_Nonnull  value);
+const char* _Nonnull typed_value_as_string(struct TypedValue*_Nonnull  value);
+const char* _Nonnull typed_value_as_uuid(struct TypedValue*_Nonnull  value);
+enum ValueType typed_value_value_type(struct TypedValue*_Nonnull value);
+
+struct QueryResultRow* _Nullable row_at_index(struct QueryResultRows* _Nonnull rows, const int32_t index);
+struct QueryRowsIterator* _Nonnull rows_iter(struct QueryResultRows* _Nonnull rows);
+struct QueryResultRow* _Nullable rows_iter_next(struct QueryRowsIterator* _Nonnull iter);
+struct QueryRowIterator* _Nonnull values_iter(struct QueryResultRow* _Nonnull row);
+struct TypedValue* _Nullable values_iter_next(struct QueryRowIterator* _Nonnull iter);
+const int64_t* _Nullable values_iter_next_as_long(struct QueryRowIterator* _Nonnull iter);
+const int64_t* _Nullable values_iter_next_as_entid(struct QueryRowIterator* _Nonnull iter);
+const char* _Nullable values_iter_next_as_kw(struct QueryRowIterator* _Nonnull iter);
+const int32_t* _Nullable values_iter_next_as_boolean(struct QueryRowIterator* _Nonnull iter);
+const double* _Nullable values_iter_next_as_double(struct QueryRowIterator* _Nonnull iter);
+const int64_t* _Nullable values_iter_next_as_timestamp(struct QueryRowIterator* _Nonnull iter);
+const char* _Nullable values_iter_next_as_string(struct QueryRowIterator* _Nonnull iter);
+const char* _Nullable values_iter_next_as_uuid(struct QueryRowIterator* _Nonnull iter);
+
+struct TypedValue* _Nonnull value_at_index(struct QueryResultRow* _Nonnull row, const int32_t index);
+int64_t value_at_index_as_long(struct QueryResultRow* _Nonnull row, const int32_t index);
+int64_t value_at_index_as_entid(struct QueryResultRow* _Nonnull row, const int32_t index);
+const char* _Nonnull value_at_index_as_kw(struct QueryResultRow* _Nonnull row, const int32_t index);
+int32_t value_at_index_as_boolean(struct QueryResultRow* _Nonnull row, const int32_t index);
+double value_at_index_as_double(struct QueryResultRow* _Nonnull row, const int32_t index);
+int64_t value_at_index_as_timestamp(struct QueryResultRow* _Nonnull row, const int32_t index);
+const char* _Nonnull value_at_index_as_string(struct QueryResultRow* _Nonnull row, const int32_t index);
+const char* _Nonnull value_at_index_as_uuid(struct QueryResultRow* _Nonnull row, const int32_t index);
+
+// Set single values
+struct Result*_Nonnull store_set_long_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const int64_t value);
+struct Result*_Nonnull store_set_entid_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const int64_t value);
+struct Result*_Nonnull store_set_kw_ref_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const char* _Nonnull value);
+struct Result*_Nonnull store_set_boolean_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const int32_t value);
+struct Result*_Nonnull store_set_double_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const double value);
+struct Result*_Nonnull store_set_timestamp_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const int64_t value);
+struct Result*_Nonnull store_set_string_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const char* _Nonnull value);
+struct Result*_Nonnull store_set_uuid_for_attribute_on_entid(struct Store*_Nonnull store, const int64_t entid, const char* _Nonnull attribute, const char* _Nonnull value);
+
+// Transaction change lists
+const struct TransactionChange* _Nullable tx_change_list_entry_at(const struct TxChangeList* _Nonnull list, size_t index);
+
+#endif /* store_h */

sdks/swift/Mentat/MentatTests/Info.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

sdks/swift/Mentat/MentatTests/MentatTests.swift

@@ -0,0 +1,836 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import XCTest
+
+@testable import Mentat
+
+class MentatTests: XCTestCase {
+
+    var schema: String?
+    var edn: String?
+    var store: Mentat?
+    
+    override func setUp() {
+        super.setUp()
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+    
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+        super.tearDown()
+    }
+
+    // test that a store can be opened in memory
+    func testOpenInMemoryStore() {
+        XCTAssertNotNil(Mentat().intoRaw())
+    }
+
+    // test that a store can be opened in a specific location
+    func testOpenStoreInLocation() {
+        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
+        let documentsURL = paths[0]
+        let storeURI = documentsURL.appendingPathComponent("test.db", isDirectory: false).absoluteString
+        XCTAssertNotNil(Mentat(storeURI: storeURI).intoRaw())
+    }
+
+    func readSchema() throws -> String {
+        guard let schema = self.schema else {
+            let bundle = Bundle(for: type(of: self))
+            let schemaUrl = bundle.url(forResource: "cities", withExtension: "schema", subdirectory: "fixtures")!
+            let schema = try String(contentsOf: schemaUrl)
+            self.schema = schema
+            return schema
+        }
+
+        return schema
+    }
+
+    func readEdn() throws -> String {
+        guard let edn = self.edn else {
+            let bundle = Bundle(for: type(of: self))
+            let ednUrl = bundle.url(forResource: "all_seattle", withExtension: "edn", subdirectory: "fixtures")!
+            let edn = try String(contentsOf: ednUrl)
+            self.edn = edn
+            return edn
+        }
+
+        return edn
+    }
+
+    func transactSchema(mentat: Mentat) throws -> TxReport {
+        let vocab = try readSchema()
+        let report = try mentat.transact(transaction: vocab)
+        return report
+    }
+
+    func transactEdn(mentat: Mentat) throws -> TxReport {
+        let edn = try readEdn()
+        let report = try mentat.transact(transaction: edn)
+        return report
+    }
+
+    func newStore() -> Mentat {
+        guard let mentat = self.store else {
+            let mentat = Mentat()
+            let _ = try! self.transactSchema(mentat: mentat)
+            let _ = try! self.transactEdn(mentat: mentat)
+            self.store = mentat
+            return mentat
+        }
+
+        return mentat
+    }
+
+    func populateWithTypesSchema(mentat: Mentat) -> TxReport? {
+        do {
+            let schema = """
+            [
+                [:db/add "b" :db/ident :foo/boolean]
+                [:db/add "b" :db/valueType :db.type/boolean]
+                [:db/add "b" :db/cardinality :db.cardinality/one]
+                [:db/add "l" :db/ident :foo/long]
+                [:db/add "l" :db/valueType :db.type/long]
+                [:db/add "l" :db/cardinality :db.cardinality/one]
+                [:db/add "r" :db/ident :foo/ref]
+                [:db/add "r" :db/valueType :db.type/ref]
+                [:db/add "r" :db/cardinality :db.cardinality/one]
+                [:db/add "i" :db/ident :foo/instant]
+                [:db/add "i" :db/valueType :db.type/instant]
+                [:db/add "i" :db/cardinality :db.cardinality/one]
+                [:db/add "d" :db/ident :foo/double]
+                [:db/add "d" :db/valueType :db.type/double]
+                [:db/add "d" :db/cardinality :db.cardinality/one]
+                [:db/add "s" :db/ident :foo/string]
+                [:db/add "s" :db/valueType :db.type/string]
+                [:db/add "s" :db/cardinality :db.cardinality/one]
+                [:db/add "k" :db/ident :foo/keyword]
+                [:db/add "k" :db/valueType :db.type/keyword]
+                [:db/add "k" :db/cardinality :db.cardinality/one]
+                [:db/add "u" :db/ident :foo/uuid]
+                [:db/add "u" :db/valueType :db.type/uuid]
+                [:db/add "u" :db/cardinality :db.cardinality/one]
+            ]
+            """
+            let report = try mentat.transact(transaction: schema)
+            let stringEntid = report.entidForTmpId(tmpId: "s")!
+
+            let data = """
+            [
+                [:db/add "a" :foo/boolean true]
+                [:db/add "a" :foo/long 25]
+                [:db/add "a" :foo/instant #inst "2017-01-01T11:00:00.000Z"]
+                [:db/add "a" :foo/double 11.23]
+                [:db/add "a" :foo/string "The higher we soar the smaller we appear to those who cannot fly."]
+                [:db/add "a" :foo/keyword :foo/string]
+                [:db/add "a" :foo/uuid #uuid "550e8400-e29b-41d4-a716-446655440000"]
+                [:db/add "b" :foo/boolean false]
+                [:db/add "b" :foo/ref \(stringEntid)]
+                [:db/add "b" :foo/long 50]
+                [:db/add "b" :foo/instant #inst "2018-01-01T11:00:00.000Z"]
+                [:db/add "b" :foo/double 22.46]
+                [:db/add "b" :foo/string "Silence is worse; all truths that are kept silent become poisonous."]
+                [:db/add "b" :foo/uuid #uuid "4cb3f828-752d-497a-90c9-b1fd516d5644"]
+            ]
+            """
+            return try mentat.transact(transaction: data)
+        } catch {
+            assertionFailure(error.localizedDescription)
+        }
+        return nil
+    }
+
+    func test1TransactVocabulary() {
+        do {
+            let mentat = Mentat()
+            let report = try transactSchema(mentat: mentat)
+            XCTAssertNotNil(report)
+            assert(report.txId > 0)
+        } catch {
+            assertionFailure(error.localizedDescription)
+        }
+    }
+
+    func test2TransactEntities() {
+        do {
+            let mentat = Mentat()
+            let _ = try self.transactSchema(mentat: mentat)
+            let report = try self.transactEdn(mentat: mentat)
+            XCTAssertNotNil(report)
+            assert(report.txId > 0)
+            let entid = report.entidForTmpId(tmpId: "a17592186045438")
+            assert(entid == 65566)
+        } catch {
+            assertionFailure(error.localizedDescription)
+        }
+    }
+
+    func testQueryScalar() {
+        let mentat = newStore()
+        let query = "[:find ?n . :in ?name :where [(fulltext $ :community/name ?name) [[?e ?n]]]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query).bind(varName: "?name", toString: "Wallingford").executeScalar(callback: { (scalarResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let result = scalarResult?.asString() else {
+                return assertionFailure("No String value received")
+            }
+            assert(result == "KOMO Communities - Wallingford")
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testQueryColl() {
+        let mentat = newStore()
+        let query = "[:find [?when ...] :where [_ :db/txInstant ?when] :order (asc ?when)]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query).executeColl(callback: { (collResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let rows = collResult else {
+                return assertionFailure("No results received")
+            }
+            // we are expecting 3 results
+            for i in 0..<3 {
+                let _ = rows.asDate(index: i)
+                assert(true)
+            }
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testQueryCollResultIterator() {
+        let mentat = newStore()
+        let query = "[:find [?when ...] :where [_ :db/txInstant ?when] :order (asc ?when)]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query).executeColl(callback: { (collResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let rows = collResult else {
+                return assertionFailure("No results received")
+            }
+
+            rows.forEach({ (value) in
+                assert(value.valueType.rawValue == 2)
+            })
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testQueryTuple() {
+        let mentat = newStore()
+        let query = """
+        [:find [?name ?cat]
+        :where
+        [?c :community/name ?name]
+        [?c :community/type :community.type/website]
+        [(fulltext $ :community/category "food") [[?c ?cat]]]]
+        """
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query).executeTuple(callback: { (tupleResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let tuple = tupleResult else {
+                return assertionFailure("expecting a result")
+            }
+            let name = tuple.asString(index: 0)
+            let category = tuple.asString(index: 1)
+            assert(name == "Community Harvest of Southwest Seattle")
+            assert(category == "sustainable food")
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testQueryRel() {
+        let mentat = newStore()
+        let query = """
+        [:find ?name ?cat
+        :where
+        [?c :community/name ?name]
+        [?c :community/type :community.type/website]
+        [(fulltext $ :community/category "food") [[?c ?cat]]]]
+        """
+        let expect = expectation(description: "Query is executed")
+        let expectedResults = [("InBallard", "food"),
+                               ("Seattle Chinatown Guide", "food"),
+                               ("Community Harvest of Southwest Seattle", "sustainable food"),
+                               ("University District Food Bank", "food bank")]
+        try! mentat.query(query: query).execute(callback: { (relResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let rows = relResult else {
+                return assertionFailure("No results received")
+            }
+
+            for (i, row) in rows.enumerated() {
+                let (name, category) = expectedResults[i]
+                assert( row.asString(index: 0) == name)
+                assert(row.asString(index: 1) == category)
+            }
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testQueryRelResultIterator() {
+        let mentat = newStore()
+        let query = """
+        [:find ?name ?cat
+        :where
+        [?c :community/name ?name]
+        [?c :community/type :community.type/website]
+        [(fulltext $ :community/category "food") [[?c ?cat]]]]
+        """
+        let expect = expectation(description: "Query is executed")
+        let expectedResults = [("InBallard", "food"),
+                               ("Seattle Chinatown Guide", "food"),
+                               ("Community Harvest of Southwest Seattle", "sustainable food"),
+                               ("University District Food Bank", "food bank")]
+        try! mentat.query(query: query).execute(callback: { (relResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let rows = relResult else {
+                return assertionFailure("No results received")
+            }
+            
+            var i = 0
+            rows.forEach({ (row) in
+                let (name, category) = expectedResults[i]
+                i += 1
+                assert(row.asString(index: 0) == name)
+                assert(row.asString(index: 1) == category)
+            })
+            assert(i == 4)
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindLong() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find ?e . :in ?bool :where [?e :foo/boolean ?bool]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+              .bind(varName: "?bool", toBoolean: true)
+              .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindRef() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let stringEntid = mentat.entidForAttribute(attribute: ":foo/string")
+        let bEntid = report.entidForTmpId(tmpId: "b")
+        let query = "[:find ?e . :in ?ref :where [?e :foo/ref ?ref]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?ref", toReference: stringEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == bEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindKwRef() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let bEntid = report.entidForTmpId(tmpId: "b")
+        let query = "[:find ?e . :in ?ref :where [?e :foo/ref ?ref]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?ref", toReference: ":foo/string")
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == bEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindKw() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find ?e . :in ?kw :where [?e :foo/keyword ?kw]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?kw", toKeyword: ":foo/string")
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindDate() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find [?e ?d] :in ?now :where [?e :foo/instant ?d] [(< ?d ?now)]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?now", toDate: Date())
+            .executeTuple { (row, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(row)
+                assert(row?.asEntid(index: 0) == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+
+    func testBindString() {
+        let mentat = newStore()
+        let query = "[:find ?n . :in ?name :where [(fulltext $ :community/name ?name) [[?e ?n]]]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+                   .bind(varName: "?name", toString: "Wallingford")
+                   .executeScalar(callback: { (scalarResult, error) in
+            assert(error == nil, "Unexpected error: \(String(describing: error))")
+            guard let result = scalarResult?.asString() else {
+                return assertionFailure("No String value received")
+            }
+            assert(result == "KOMO Communities - Wallingford")
+            expect.fulfill()
+        })
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindUuid() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find ?e . :in ?uuid :where [?e :foo/uuid ?uuid]]"
+        let uuid = UUID(uuidString: "550e8400-e29b-41d4-a716-446655440000")!
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?uuid", toUuid: uuid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindBoolean() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find ?e . :in ?bool :where [?e :foo/boolean ?bool]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?bool", toBoolean: true)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testBindDouble() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")
+        let query = "[:find ?e . :in ?double :where [?e :foo/double ?double]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?double", toDouble: 11.23)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsLong() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/long ?v]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asLong() == 25)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsRef() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?e . :where [?e :foo/long 25]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asEntid() == aEntid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsKw() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/keyword ?v]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asKeyword() == ":foo/string")
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsBoolean() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/boolean ?v]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asBool() == true)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsDouble() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/double ?v]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asDouble() == 11.23)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsDate() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/instant ?v]]"
+        let expect = expectation(description: "Query is executed")
+
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
+        let expectedDate = formatter.date(from: "2017-01-01T11:00:00+00:00")
+
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asDate() == expectedDate)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsString() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/string ?v]]"
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asString() == "The higher we soar the smaller we appear to those who cannot fly.")
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testTypedValueAsUuid() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let query = "[:find ?v . :in ?e :where [?e :foo/uuid ?v]]"
+        let expectedUuid = UUID(uuidString: "550e8400-e29b-41d4-a716-446655440000")!
+        let expect = expectation(description: "Query is executed")
+        try! mentat.query(query: query)
+            .bind(varName: "?e", toReference: aEntid)
+            .executeScalar { (value, error) in
+                assert(error == nil, "Unexpected error: \(String(describing: error))")
+                XCTAssertNotNil(value)
+                assert(value?.asUUID() == expectedUuid)
+                expect.fulfill()
+        }
+        waitForExpectations(timeout: 1) { error in
+            if let error = error {
+                assertionFailure("waitForExpectationsWithTimeout errored: \(error)")
+            }
+        }
+    }
+
+    func testValueForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let value = mentat.value(forAttribute: ":foo/long", ofEntity: aEntid)
+        XCTAssertNotNil(value)
+        assert(value?.asLong() == 25)
+    }
+
+    func testEntidForAttribute() {
+        let mentat = Mentat()
+        let _ = self.populateWithTypesSchema(mentat: mentat)!
+        let entid = mentat.entidForAttribute(attribute: ":foo/long")
+        assert(entid == 65540)
+    }
+
+    func testSetLongForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/long"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asLong() == 25)
+        XCTAssertNoThrow(try mentat.set(long: 100, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asLong() == 100)
+    }
+
+    func testSetBooleanForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/boolean"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asBool() == true)
+        XCTAssertNoThrow(try mentat.set(boolean: false, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        let p = post?.asBool()
+        assert(p == false)
+    }
+
+    func testSetRefForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let bEntid = report.entidForTmpId(tmpId: "b")!
+        let attr = ":foo/ref"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNil(pre)
+        XCTAssertNoThrow(try mentat.set(reference: bEntid, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asEntid() == bEntid)
+    }
+
+    func testSetRefKwForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/ref"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNil(pre)
+        XCTAssertNoThrow(try mentat.setKeywordReference(value: ":foo/long", forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asEntid() == 65540)
+    }
+
+    func testSetDateForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/instant"
+
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
+        let previousDate = formatter.date(from: "2017-01-01T11:00:00+00:00")
+
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asDate() == previousDate)
+
+        let now = Date()
+        XCTAssertNoThrow(try mentat.set(date: now, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        let p = post?.asDate()
+
+        assert(formatter.string(from: p!) == formatter.string(from: now))
+    }
+
+    func testSetDoubleForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/double"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asDouble() == 11.23)
+        XCTAssertNoThrow(try mentat.set(double: 22.0, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asDouble() == 22.0)
+    }
+
+    func testSetStringForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let attr = ":foo/string"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asString() == "The higher we soar the smaller we appear to those who cannot fly.")
+        XCTAssertNoThrow(try mentat.set(string: "Become who you are!", forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asString() == "Become who you are!")
+    }
+
+    func testSetUuidForAttributeOfEntity() {
+        let mentat = Mentat()
+        let report = self.populateWithTypesSchema(mentat: mentat)!
+        let aEntid = report.entidForTmpId(tmpId: "a")!
+        let previousUuid = UUID(uuidString: "550e8400-e29b-41d4-a716-446655440000")!
+        let attr = ":foo/uuid"
+        let pre = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(pre)
+        assert(pre?.asUUID() == previousUuid)
+
+        let newUuid = UUID()
+        XCTAssertNoThrow(try mentat.set(uuid: newUuid, forAttribute: attr, onEntity: aEntid))
+        let post = mentat.value(forAttribute: attr, ofEntity: aEntid)
+        XCTAssertNotNil(post)
+        assert(post?.asUUID() == newUuid)
+    }
+}

src/lib.rs

@@ -54,6 +54,7 @@ pub use mentat_query::{
 pub use mentat_db::{
     CORE_SCHEMA_VERSION,
     DB_SCHEMA_CORE,
+    AttributeSet,
     TxObserver,
     TxReport,
     new_connection,

src/query_builder.rs

@@ -14,9 +14,11 @@ use std::collections::{
 };
 
 use mentat_core::{
+    DateTime,
     Entid,
     NamespacedKeyword,
     TypedValue,
+    Utc,
     ValueType,
 };
 
@@ -72,6 +74,11 @@ impl<'a> QueryBuilder<'a> {
        self
     }
 
+    pub fn bind_date_time(&mut self, var: &str, value: DateTime<Utc>) -> &mut Self {
+       self.values.insert(Variable::from_valid_name(var), TypedValue::Instant(value));
+       self
+    }
+
     pub fn bind_type(&mut self, var: &str, value_type: ValueType) -> &mut Self {
         self.types.insert(Variable::from_valid_name(var), value_type);
         self
@@ -114,6 +121,11 @@ mod test {
         Store,
     };
 
+    use mentat_core::{
+        DateTime,
+        Utc,
+    };
+
     #[test]
     fn test_scalar_query() {
         let mut store = Store::open("").expect("store connection");
@@ -386,4 +398,45 @@ mod test {
         assert_eq!(results.get(0).map_or(None, |t| t.to_owned().into_boolean()).expect("boolean"), true);
         assert_eq!(results.get(1).map_or(None, |t| t.to_owned().into_long()).expect("long"), 25);
     }
+
+    #[test]
+    fn test_bind_date() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+            [:db/add "i" :db/ident :foo/instant]
+            [:db/add "i" :db/valueType :db.type/instant]
+            [:db/add "i" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+            [:db/add "p" :foo/boolean false]
+            [:db/add "p" :foo/long 28]
+            [:db/add "p" :foo/instant #inst "2018-04-11T15:08:00.000Z"]
+        ]"#).expect("successful transaction");
+
+        let p_entid = report.tempids.get("p").expect("found it").clone();
+
+        let time = DateTime::parse_from_rfc3339("2018-04-11T19:17:00.000Z")
+                        .map(|t| t.with_timezone(&Utc))
+                        .expect("expected valid date");
+        let results = QueryBuilder::new(&mut store, r#"[:find [?e ?d] :in ?now :where [?e :foo/instant ?d] [(< ?d ?now)]]"#)
+                              .bind_date_time("?now", time)
+                              .execute_tuple().expect("TupleResult")
+                              .unwrap_or(vec![]);
+        assert_eq!(results.get(0).map_or(None, |t| t.to_owned().into_entid()).expect("entid"), p_entid);
+        let instant = results.get(1).map_or(None, |t| t.to_owned().into_timestamp()).expect("instant");
+        assert_eq!(instant, 1523459280);
+    }
 }