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Write more tests, handle more types for printing and a few other code cleanups for edn types, r=jwalker (#233)

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This commit is contained in:
Victor Porof 2017-02-02 17:23:07 +01:00
commit 816a85f0a3
1 changed files with 129 additions and 62 deletions
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191
edn/src/types.rs
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@ -8,14 +8,12 @@
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
#![allow(unused_imports)]
use std::collections::{BTreeSet, BTreeMap, LinkedList};
use std::cmp::{Ordering, Ord, PartialOrd};
use std::fmt::{Display, Formatter};
use symbols;
use num::bigint::{BigInt, ToBigInt, ParseBigIntError};
use num::BigInt;
use ordered_float::OrderedFloat;
/// Value represents one of the allowed values in an EDN string.
@ -33,6 +31,9 @@ pub enum Value {
Keyword(symbols::Keyword),
NamespacedKeyword(symbols::NamespacedKeyword),
Vector(Vec<Value>),
// We're using a LinkedList here instead of a Vec or VecDeque because the
// LinkedList is faster for appending (which we do a lot of).
// See https://github.com/mozilla/mentat/issues/231
List(LinkedList<Value>),
// We're using BTree{Set, Map} rather than Hash{Set, Map} because the BTree variants
// implement Hash. The Hash variants don't in order to preserve O(n) hashing
@ -45,56 +46,52 @@ pub enum Value {
use self::Value::*;
impl Display for Value {
// TODO: Make sure float syntax is correct, handle NaN and escaping.
// See https://github.com/mozilla/mentat/issues/232
fn fmt(&self, f: &mut Formatter) -> ::std::fmt::Result {
match *self {
Keyword(ref v) => v.fmt(f),
NamespacedKeyword(ref v) => v.fmt(f),
PlainSymbol(ref v) => v.fmt(f),
NamespacedSymbol(ref v) => v.fmt(f),
Nil => write!(f, "null"),
Boolean(v) => write!(f, "{}", v),
Integer(v) => write!(f, "{}", v),
BigInteger(ref v) => write!(f, "{}N", v),
Float(OrderedFloat(v)) => write!(f, "{}", v), // TODO: make sure float syntax is correct.
// TODO: NaN.
Text(ref v) => write!(f, "{}", v), // TODO: EDN escaping.
Float(OrderedFloat(v)) => write!(f, "{}", v),
Text(ref v) => write!(f, "{}", v),
PlainSymbol(ref v) => v.fmt(f),
NamespacedSymbol(ref v) => v.fmt(f),
Keyword(ref v) => v.fmt(f),
NamespacedKeyword(ref v) => v.fmt(f),
Vector(ref v) => {
try!(write!(f, "["));
write!(f, "[")?;
for x in v {
try!(write!(f, " {}", x));
write!(f, " {}", x)?;
}
write!(f, " ]")
}
_ =>
write!(f, "{}",
match *self {
Nil => "null",
Boolean(b) => if b { "true" } else { "false" },
_ => unimplemented!(),
}),
List(ref v) => {
write!(f, "(")?;
for x in v {
write!(f, " {}", x)?;
}
write!(f, " )")
}
Set(ref v) => {
write!(f, "#{{")?;
for x in v {
write!(f, " {}", x)?;
}
write!(f, " }}")
}
Map(ref v) => {
write!(f, "{{")?;
for (key, val) in v {
write!(f, " :{} {}", key, val)?;
}
write!(f, " }}")
}
}
}
}
#[test]
fn test_value_from() {
assert_eq!(Value::from(42f64), Value::Float(OrderedFloat::from(42f64)));
assert_eq!(Value::from_bigint("42").unwrap(), Value::BigInteger(42.to_bigint().unwrap()));
}
#[test]
fn test_print_edn() {
assert_eq!("[ 1 2 [ 3.1 ] [ ] :five :six/seven eight nine/ten true ]",
Value::Vector(vec!(Value::Integer(1),
Value::Integer(2),
Value::Vector(vec!(Value::Float(OrderedFloat(3.1)))),
Value::Vector(vec!()),
Value::Keyword(symbols::Keyword::new("five")),
Value::NamespacedKeyword(symbols::NamespacedKeyword::new("six", "seven")),
Value::PlainSymbol(symbols::PlainSymbol::new("eight")),
Value::NamespacedSymbol(symbols::NamespacedSymbol::new("nine", "ten")),
Value::Boolean(true))).to_string());
}
/// Creates `is_$TYPE` helper functions for Value, like
/// `is_big_integer()` or `is_text()`.
macro_rules! def_is {
@ -155,6 +152,14 @@ impl Value {
pub fn from_bigint(src: &str) -> Option<Value> {
src.parse::<BigInt>().map(Value::BigInteger).ok()
}
pub fn from_symbol<'a, T: Into<Option<&'a str>>>(namespace: T, name: &str) -> Value {
to_symbol(namespace, name)
}
pub fn from_keyword<'a, T: Into<Option<&'a str>>>(namespace: T, name: &str) -> Value {
to_keyword(namespace, name)
}
}
impl From<f64> for Value {
@ -169,28 +174,24 @@ impl PartialOrd for Value {
}
}
// TODO: Check we follow the equality rules at the bottom of https://github.com/edn-format/edn
impl Ord for Value {
fn cmp(&self, other: &Value) -> Ordering {
let ord_order = to_ord(self).cmp(&to_ord(other));
match *self {
Nil => match *other { Nil => Ordering::Equal, _ => ord_order },
Boolean(bs) => match *other { Boolean(bo) => bo.cmp(&bs), _ => ord_order },
BigInteger(ref bs) => match *other { BigInteger(ref bo) => bo.cmp(&bs), _ => ord_order },
Integer(is) => match *other { Integer(io) => io.cmp(&is), _ => ord_order },
Float(ref fs) => match *other { Float(ref fo) => fo.cmp(&fs), _ => ord_order },
Text(ref ts) => match *other { Text(ref to) => to.cmp(&ts), _ => ord_order },
PlainSymbol(ref ss) => match *other { PlainSymbol(ref so) => so.cmp(&ss), _ => ord_order },
NamespacedSymbol(ref ss)
=> match *other { NamespacedSymbol(ref so) => so.cmp(&ss), _ => ord_order },
Keyword(ref ks) => match *other { Keyword(ref ko) => ko.cmp(&ks), _ => ord_order },
NamespacedKeyword(ref ks)
=> match *other { NamespacedKeyword(ref ko) => ko.cmp(&ks), _ => ord_order },
Vector(ref vs) => match *other { Vector(ref vo) => vo.cmp(&vs), _ => ord_order },
List(ref ls) => match *other { List(ref lo) => lo.cmp(&ls), _ => ord_order },
Set(ref ss) => match *other { Set(ref so) => so.cmp(&ss), _ => ord_order },
Map(ref ms) => match *other { Map(ref mo) => mo.cmp(&ms), _ => ord_order },
match (self, other) {
(&Nil, &Nil) => Ordering::Equal,
(&Boolean(a), &Boolean(b)) => b.cmp(&a),
(&Integer(a), &Integer(b)) => b.cmp(&a),
(&BigInteger(ref a), &BigInteger(ref b)) => b.cmp(a),
(&Float(ref a), &Float(ref b)) => b.cmp(a),
(&Text(ref a), &Text(ref b)) => b.cmp(a),
(&PlainSymbol(ref a), &PlainSymbol(ref b)) => b.cmp(a),
(&NamespacedSymbol(ref a), &NamespacedSymbol(ref b)) => b.cmp(a),
(&Keyword(ref a), &Keyword(ref b)) => b.cmp(a),
(&NamespacedKeyword(ref a), &NamespacedKeyword(ref b)) => b.cmp(a),
(&Vector(ref a), &Vector(ref b)) => b.cmp(a),
(&List(ref a), &List(ref b)) => b.cmp(a),
(&Set(ref a), &Set(ref b)) => b.cmp(a),
(&Map(ref a), &Map(ref b)) => b.cmp(a),
_ => to_ord(self).cmp(&to_ord(other))
}
}
}
@ -214,8 +215,6 @@ fn to_ord(value: &Value) -> i32 {
}
}
pub struct Pair(Value, Value);
/// Converts `name` into a plain or namespaced value symbol, depending on
/// whether or not `namespace` is given.
///
@ -256,4 +255,72 @@ pub fn to_keyword<'a, T: Into<Option<&'a str>>>(namespace: T, name: &str) -> Val
namespace.into().map_or_else(
|| Value::Keyword(symbols::Keyword::new(name)),
|ns| Value::NamespacedKeyword(symbols::NamespacedKeyword::new(ns, name)))
}
#[cfg(test)]
mod test {
extern crate ordered_float;
extern crate num;
use super::*;
use std::collections::{BTreeSet, BTreeMap, LinkedList};
use std::cmp::{Ordering};
use symbols;
use num::BigInt;
use ordered_float::OrderedFloat;
use std::iter::FromIterator;
#[test]
fn test_value_from() {
assert_eq!(Value::from(42f64), Value::Float(OrderedFloat::from(42f64)));
assert_eq!(Value::from_bigint("42").unwrap(), Value::BigInteger(BigInt::from(42)));
}
#[test]
fn test_print_edn() {
assert_eq!("[ 1 2 ( 3.14 ) #{ 4N } { :foo/bar 42 } [ ] :five :six/seven eight nine/ten true false null ]",
Value::Vector(vec![
Value::Integer(1),
Value::Integer(2),
Value::List(LinkedList::from_iter(vec![
Value::Float(OrderedFloat(3.14))
])),
Value::Set(BTreeSet::from_iter(vec![
Value::from_bigint("4").unwrap()
])),
Value::Map(BTreeMap::from_iter(vec![
(Value::from_symbol("foo", "bar"), Value::Integer(42))
])),
Value::Vector(vec![]),
Value::Keyword(symbols::Keyword::new("five")),
Value::NamespacedKeyword(symbols::NamespacedKeyword::new("six", "seven")),
Value::PlainSymbol(symbols::PlainSymbol::new("eight")),
Value::NamespacedSymbol(symbols::NamespacedSymbol::new("nine", "ten")),
Value::Boolean(true),
Value::Boolean(false),
Value::Nil
]
).to_string());
}
#[test]
fn test_ord() {
// TODO: Check we follow the equality rules at the bottom of https://github.com/edn-format/edn
assert_eq!(Value::Nil.cmp(&Value::Nil), Ordering::Equal);
assert_eq!(Value::Boolean(false).cmp(&Value::Boolean(true)), Ordering::Greater);
assert_eq!(Value::Integer(1).cmp(&Value::Integer(2)), Ordering::Greater);
assert_eq!(Value::from_bigint("1").cmp(&Value::from_bigint("2")), Ordering::Greater);
assert_eq!(Value::from(1f64).cmp(&Value::from(2f64)), Ordering::Greater);
assert_eq!(Value::Text("1".to_string()).cmp(&Value::Text("2".to_string())), Ordering::Greater);
assert_eq!(Value::from_symbol("a", "b").cmp(&Value::from_symbol("c", "d")), Ordering::Greater);
assert_eq!(Value::from_symbol(None, "a").cmp(&Value::from_symbol(None, "b")), Ordering::Greater);
assert_eq!(Value::from_keyword(":a", ":b").cmp(&Value::from_keyword(":c", ":d")), Ordering::Greater);
assert_eq!(Value::from_keyword(None, ":a").cmp(&Value::from_keyword(None, ":b")), Ordering::Greater);
assert_eq!(Value::Vector(vec![]).cmp(&Value::Vector(vec![])), Ordering::Equal);
assert_eq!(Value::List(LinkedList::new()).cmp(&Value::List(LinkedList::new())), Ordering::Equal);
assert_eq!(Value::Set(BTreeSet::new()).cmp(&Value::Set(BTreeSet::new())), Ordering::Equal);
assert_eq!(Value::Map(BTreeMap::new()).cmp(&Value::Map(BTreeMap::new())), Ordering::Equal);
}
}