Add transact FFI function

ffi/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mentat_ffi"
-version = "0.1.0"
+version = "0.0.1"
 authors = ["Emily Toop <etoop@mozilla.com>"]
 
 [lib]

ffi/src/lib.rs

@@ -137,6 +137,19 @@ 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().map(|mut in_progress| {
+        in_progress.transact(&transaction).map(|tx_report| {
+            in_progress.commit()
+                       .map(|_| tx_report)
+        })
+    });
+    Box::into_raw(Box::new(result.into()))
+}
+
 // TODO: cache
 
 // TODO: q_once
@@ -469,12 +482,6 @@ 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;

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
+}