526 lines
20 KiB
Rust
526 lines
20 KiB
Rust
// Copyright 2016 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#![cfg_attr(feature = "cargo-clippy", allow(linkedlist))]
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use std::collections::{BTreeSet, BTreeMap, LinkedList};
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use std::cmp::{Ordering, Ord, PartialOrd};
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use std::fmt::{Display, Formatter};
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use std::f64;
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use symbols;
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use num::BigInt;
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use ordered_float::OrderedFloat;
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/// Value represents one of the allowed values in an EDN string.
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#[derive(PartialEq, Eq, Hash, Clone, Debug)]
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pub enum Value {
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Nil,
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Boolean(bool),
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Integer(i64),
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BigInteger(BigInt),
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Float(OrderedFloat<f64>),
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Text(String),
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PlainSymbol(symbols::PlainSymbol),
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NamespacedSymbol(symbols::NamespacedSymbol),
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Keyword(symbols::Keyword),
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NamespacedKeyword(symbols::NamespacedKeyword),
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Vector(Vec<Value>),
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// We're using a LinkedList here instead of a Vec or VecDeque because the
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// LinkedList is faster for appending (which we do a lot of).
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// See https://github.com/mozilla/mentat/issues/231
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List(LinkedList<Value>),
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// We're using BTree{Set, Map} rather than Hash{Set, Map} because the BTree variants
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// implement Hash. The Hash variants don't in order to preserve O(n) hashing
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// time, which is hard given recursive data structures.
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// See https://internals.rust-lang.org/t/implementing-hash-for-hashset-hashmap/3817/1
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Set(BTreeSet<Value>),
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Map(BTreeMap<Value, Value>),
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}
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/// `SpannedValue` is the parallel to `Value` but used in `ValueAndSpan`.
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/// Container types have `ValueAndSpan` children.
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#[derive(PartialEq, Eq, Hash, Clone, Debug)]
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pub enum SpannedValue {
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Nil,
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Boolean(bool),
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Integer(i64),
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BigInteger(BigInt),
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Float(OrderedFloat<f64>),
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Text(String),
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PlainSymbol(symbols::PlainSymbol),
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NamespacedSymbol(symbols::NamespacedSymbol),
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Keyword(symbols::Keyword),
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NamespacedKeyword(symbols::NamespacedKeyword),
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Vector(Vec<ValueAndSpan>),
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List(LinkedList<ValueAndSpan>),
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Set(BTreeSet<ValueAndSpan>),
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Map(BTreeMap<ValueAndSpan, ValueAndSpan>),
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}
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/// Span represents the current offset (start, end) into the input string.
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#[derive(PartialEq, Eq, Hash, Clone, Debug)]
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pub struct Span(pub usize, pub usize);
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/// A wrapper type around `SpannedValue` and `Span`, representing some EDN value
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/// and the parsing offset (start, end) in the original EDN string.
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#[derive(PartialEq, Eq, Hash, Clone, Debug)]
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pub struct ValueAndSpan {
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pub inner: SpannedValue,
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pub span: Span,
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}
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impl From<SpannedValue> for Value {
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fn from(src: SpannedValue) -> Value {
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match src {
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SpannedValue::Nil => Value::Nil,
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SpannedValue::Boolean(v) => Value::Boolean(v),
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SpannedValue::Integer(v) => Value::Integer(v),
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SpannedValue::BigInteger(v) => Value::BigInteger(v),
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SpannedValue::Float(v) => Value::Float(v),
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SpannedValue::Text(v) => Value::Text(v),
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SpannedValue::PlainSymbol(v) => Value::PlainSymbol(v),
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SpannedValue::NamespacedSymbol(v) => Value::NamespacedSymbol(v),
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SpannedValue::Keyword(v) => Value::Keyword(v),
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SpannedValue::NamespacedKeyword(v) => Value::NamespacedKeyword(v),
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SpannedValue::Vector(v) => Value::Vector(v.into_iter().map(|x| x.without_spans()).collect()),
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SpannedValue::List(v) => Value::List(v.into_iter().map(|x| x.without_spans()).collect()),
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SpannedValue::Set(v) => Value::Set(v.into_iter().map(|x| x.without_spans()).collect()),
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SpannedValue::Map(v) => Value::Map(v.into_iter().map(|(x, y)| (x.without_spans(), y.without_spans())).collect()),
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}
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}
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}
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/// Creates `from_$TYPE` helper functions for Value and SpannedValue,
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/// like `from_float()` or `from_ordered_float()`.
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macro_rules! def_from {
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($name: ident, $out: ty, $kind: path, $t: ty, $( $transform: expr ),* ) => {
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pub fn $name(src: $t) -> $out {
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$( let src = $transform(src); )*
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$kind(src)
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}
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}
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}
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/// Creates `from_$TYPE` helper functions for Value or SpannedValue,
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/// like `from_bigint()` where the conversion is optional.
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macro_rules! def_from_option {
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($name: ident, $out: ty, $kind: path, $t: ty, $( $transform: expr ),* ) => {
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pub fn $name(src: $t) -> Option<$out> {
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$( let src = $transform(src); )*
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src.map($kind)
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}
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}
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}
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/// Creates `is_$TYPE` helper functions for Value or SpannedValue, like
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/// `is_big_integer()` or `is_text()`.
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macro_rules! def_is {
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($name: ident, $pat: pat) => {
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pub fn $name(&self) -> bool {
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match *self { $pat => true, _ => false }
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}
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}
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}
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/// Creates `as_$TYPE` helper functions for Value or SpannedValue, like
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/// `as_integer()`, which returns the underlying value representing the
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/// original variable wrapped in an Option, like `Option<i64>`.
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macro_rules! def_as {
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($name: ident, $kind: path, $t: ty, $( $transform: expr ),* ) => {
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pub fn $name(&self) -> Option<$t> {
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match *self { $kind(v) => { $( let v = $transform(v) )*; Some(v) }, _ => None }
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}
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}
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}
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/// Creates `as_$TYPE` helper functions for Value or SpannedValue, like
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/// `as_big_integer()`, which returns a reference to the underlying value
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/// representing the original variable wrapped in an Option, like `Option<&BigInt>`.
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macro_rules! def_as_ref {
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($name: ident, $kind: path, $t: ty) => {
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pub fn $name(&self) -> Option<&$t> {
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match *self { $kind(ref v) => Some(v), _ => None }
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}
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}
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}
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/// Creates `into_$TYPE` helper functions for Value or SpannedValue, like
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/// `into_big_integer()`, which consumes it returning underlying value
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/// representing the original variable wrapped in an Option, like `Option<BigInt>`.
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macro_rules! def_into {
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($name: ident, $kind: path, $t: ty, $( $transform: expr ),* ) => {
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pub fn $name(self) -> Option<$t> {
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match self { $kind(v) => { $( let v = $transform(v) )*; Some(v) }, _ => None }
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}
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}
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}
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/// Converts `name` into a plain or namespaced value symbol, depending on
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/// whether or not `namespace` is given.
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///
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/// # Examples
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///
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/// ```
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/// # use edn::types::to_symbol;
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/// # use edn::types::Value;
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/// # use edn::symbols;
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/// let value = to_symbol!("foo", "bar", Value);
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/// assert_eq!(value, Value::NamespacedSymbol(symbols::NamespacedSymbol::new("foo", "bar")));
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///
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/// let value = to_symbol!(None, "baz", Value);
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/// assert_eq!(value, Value::PlainSymbol(symbols::PlainSymbol::new("baz")));
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///
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/// let value = to_symbol!("foo", "bar", SpannedValue);
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/// assert_eq!(value.into(), to_symbol!("foo", "bar", Value));
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///
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/// let value = to_symbol!(None, "baz", SpannedValue);
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/// assert_eq!(value.into(), to_symbol!(None, "baz", Value));
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/// ```
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macro_rules! to_symbol {
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( $namespace:expr, $name:expr, $t:tt ) => {
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$namespace.into().map_or_else(
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|| $t::PlainSymbol(symbols::PlainSymbol::new($name)),
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|ns| $t::NamespacedSymbol(symbols::NamespacedSymbol::new(ns, $name)))
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}
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}
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/// Converts `name` into a plain or namespaced value keyword, depending on
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/// whether or not `namespace` is given.
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///
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/// # Examples
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///
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/// ```
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/// # use edn::types::to_keyword;
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/// # use edn::types::Value;
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/// # use edn::symbols;
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/// let value = to_keyword!("foo", "bar", Value);
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/// assert_eq!(value, Value::NamespacedKeyword(symbols::NamespacedKeyword::new("foo", "bar")));
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///
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/// let value = to_keyword!(None, "baz", Value);
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/// assert_eq!(value, Value::Keyword(symbols::Keyword::new("baz")));
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///
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/// let value = to_keyword!("foo", "bar", SpannedValue);
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/// assert_eq!(value.into(), to_keyword!("foo", "bar", Value));
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///
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/// let value = to_keyword!(None, "baz", SpannedValue);
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/// assert_eq!(value.into(), to_keyword!(None, "baz", Value));
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/// ```
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macro_rules! to_keyword {
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( $namespace:expr, $name:expr, $t:tt ) => {
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$namespace.into().map_or_else(
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|| $t::Keyword(symbols::Keyword::new($name)),
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|ns| $t::NamespacedKeyword(symbols::NamespacedKeyword::new(ns, $name)))
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}
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}
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/// Implements multiple is*, as*, into* and from* methods common to
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/// both Value and SpannedValue.
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macro_rules! def_common_value_methods {
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( $t:tt<$tchild:tt> ) => {
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def_is!(is_nil, $t::Nil);
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def_is!(is_boolean, $t::Boolean(_));
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def_is!(is_integer, $t::Integer(_));
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def_is!(is_big_integer, $t::BigInteger(_));
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def_is!(is_float, $t::Float(_));
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def_is!(is_text, $t::Text(_));
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def_is!(is_symbol, $t::PlainSymbol(_));
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def_is!(is_namespaced_symbol, $t::NamespacedSymbol(_));
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def_is!(is_keyword, $t::Keyword(_));
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def_is!(is_namespaced_keyword, $t::NamespacedKeyword(_));
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def_is!(is_vector, $t::Vector(_));
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def_is!(is_list, $t::List(_));
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def_is!(is_set, $t::Set(_));
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def_is!(is_map, $t::Map(_));
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/// `as_nil` does not use the macro as it does not have an underlying
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/// value, and returns `Option<()>`.
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pub fn as_nil(&self) -> Option<()> {
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match *self { $t::Nil => Some(()), _ => None }
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}
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def_as!(as_boolean, $t::Boolean, bool,);
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def_as!(as_integer, $t::Integer, i64,);
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def_as!(as_float, $t::Float, f64, |v: OrderedFloat<f64>| v.into_inner());
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def_as_ref!(as_big_integer, $t::BigInteger, BigInt);
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def_as_ref!(as_ordered_float, $t::Float, OrderedFloat<f64>);
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def_as_ref!(as_text, $t::Text, String);
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def_as_ref!(as_symbol, $t::PlainSymbol, symbols::PlainSymbol);
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def_as_ref!(as_namespaced_symbol, $t::NamespacedSymbol, symbols::NamespacedSymbol);
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def_as_ref!(as_keyword, $t::Keyword, symbols::Keyword);
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def_as_ref!(as_namespaced_keyword, $t::NamespacedKeyword, symbols::NamespacedKeyword);
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def_as_ref!(as_vector, $t::Vector, Vec<$tchild>);
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def_as_ref!(as_list, $t::List, LinkedList<$tchild>);
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def_as_ref!(as_set, $t::Set, BTreeSet<$tchild>);
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def_as_ref!(as_map, $t::Map, BTreeMap<$tchild, $tchild>);
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def_into!(into_boolean, $t::Boolean, bool,);
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def_into!(into_integer, $t::Integer, i64,);
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def_into!(into_big_integer, $t::BigInteger, BigInt,);
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def_into!(into_ordered_float, $t::Float, OrderedFloat<f64>,);
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def_into!(into_float, $t::Float, f64, |v: OrderedFloat<f64>| v.into_inner());
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def_into!(into_text, $t::Text, String,);
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def_into!(into_symbol, $t::PlainSymbol, symbols::PlainSymbol,);
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def_into!(into_namespaced_symbol, $t::NamespacedSymbol, symbols::NamespacedSymbol,);
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def_into!(into_keyword, $t::Keyword, symbols::Keyword,);
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def_into!(into_namespaced_keyword, $t::NamespacedKeyword, symbols::NamespacedKeyword,);
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def_into!(into_vector, $t::Vector, Vec<$tchild>,);
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def_into!(into_list, $t::List, LinkedList<$tchild>,);
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def_into!(into_set, $t::Set, BTreeSet<$tchild>,);
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def_into!(into_map, $t::Map, BTreeMap<$tchild, $tchild>,);
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def_from_option!(from_bigint, $t, $t::BigInteger, &str, |src: &str| src.parse::<BigInt>().ok());
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def_from!(from_float, $t, $t::Float, f64, |src: f64| OrderedFloat::from(src));
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def_from!(from_ordered_float, $t, $t::Float, OrderedFloat<f64>,);
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pub fn from_symbol<'a, T: Into<Option<&'a str>>>(namespace: T, name: &str) -> $t {
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to_symbol!(namespace, name, $t)
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}
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pub fn from_keyword<'a, T: Into<Option<&'a str>>>(namespace: T, name: &str) -> $t {
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to_keyword!(namespace, name, $t)
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}
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fn precedence(&self) -> i32 {
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match *self {
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$t::Nil => 0,
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$t::Boolean(_) => 1,
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$t::Integer(_) => 2,
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$t::BigInteger(_) => 3,
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$t::Float(_) => 4,
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$t::Text(_) => 5,
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$t::PlainSymbol(_) => 6,
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$t::NamespacedSymbol(_) => 7,
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$t::Keyword(_) => 8,
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$t::NamespacedKeyword(_) => 9,
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$t::Vector(_) => 10,
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$t::List(_) => 11,
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$t::Set(_) => 12,
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$t::Map(_) => 13,
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}
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}
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}
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}
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/// Compares Value or SpannedValue instances and returns Ordering.
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/// Used in `Ord` implementations.
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macro_rules! def_common_value_ord {
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( $t:tt, $value:expr, $other:expr ) => {
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match ($value, $other) {
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(&$t::Nil, &$t::Nil) => Ordering::Equal,
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(&$t::Boolean(a), &$t::Boolean(b)) => b.cmp(&a),
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(&$t::Integer(a), &$t::Integer(b)) => b.cmp(&a),
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(&$t::BigInteger(ref a), &$t::BigInteger(ref b)) => b.cmp(a),
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(&$t::Float(ref a), &$t::Float(ref b)) => b.cmp(a),
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(&$t::Text(ref a), &$t::Text(ref b)) => b.cmp(a),
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(&$t::PlainSymbol(ref a), &$t::PlainSymbol(ref b)) => b.cmp(a),
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(&$t::NamespacedSymbol(ref a), &$t::NamespacedSymbol(ref b)) => b.cmp(a),
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(&$t::Keyword(ref a), &$t::Keyword(ref b)) => b.cmp(a),
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(&$t::NamespacedKeyword(ref a), &$t::NamespacedKeyword(ref b)) => b.cmp(a),
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(&$t::Vector(ref a), &$t::Vector(ref b)) => b.cmp(a),
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(&$t::List(ref a), &$t::List(ref b)) => b.cmp(a),
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(&$t::Set(ref a), &$t::Set(ref b)) => b.cmp(a),
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(&$t::Map(ref a), &$t::Map(ref b)) => b.cmp(a),
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_ => $value.precedence().cmp(&$other.precedence())
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}
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}
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}
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/// Converts a Value or SpannedValue to string, given a formatter.
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// TODO: Make sure float syntax is correct, handle NaN and escaping.
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// See https://github.com/mozilla/mentat/issues/232
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macro_rules! def_common_value_display {
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( $t:tt, $value:expr, $f:expr ) => {
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match *$value {
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$t::Nil => write!($f, "nil"),
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$t::Boolean(v) => write!($f, "{}", v),
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$t::Integer(v) => write!($f, "{}", v),
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$t::BigInteger(ref v) => write!($f, "{}N", v),
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// TODO: make sure float syntax is correct.
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$t::Float(ref v) => {
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if *v == OrderedFloat(f64::INFINITY) {
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write!($f, "#f +Infinity")
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} else if *v == OrderedFloat(f64::NEG_INFINITY) {
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write!($f, "#f -Infinity")
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} else if *v == OrderedFloat(f64::NAN) {
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write!($f, "#f NaN")
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} else {
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write!($f, "{}", v)
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}
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}
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// TODO: EDN escaping.
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$t::Text(ref v) => write!($f, "{}", v),
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$t::PlainSymbol(ref v) => v.fmt($f),
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$t::NamespacedSymbol(ref v) => v.fmt($f),
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$t::Keyword(ref v) => v.fmt($f),
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$t::NamespacedKeyword(ref v) => v.fmt($f),
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$t::Vector(ref v) => {
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write!($f, "[")?;
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for x in v {
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write!($f, " {}", x)?;
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}
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write!($f, " ]")
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}
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$t::List(ref v) => {
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write!($f, "(")?;
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for x in v {
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write!($f, " {}", x)?;
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}
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write!($f, " )")
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}
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$t::Set(ref v) => {
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write!($f, "#{{")?;
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for x in v {
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write!($f, " {}", x)?;
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}
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write!($f, " }}")
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}
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$t::Map(ref v) => {
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write!($f, "{{")?;
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for (key, val) in v {
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write!($f, " {} {}", key, val)?;
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}
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write!($f, " }}")
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}
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}
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}
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}
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macro_rules! def_common_value_impl {
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( $t:tt<$tchild:tt> ) => {
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impl $t {
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def_common_value_methods!($t<$tchild>);
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}
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impl PartialOrd for $t {
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fn partial_cmp(&self, other: &$t) -> Option<Ordering> {
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Some(self.cmp(other))
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}
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}
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impl Ord for $t {
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fn cmp(&self, other: &$t) -> Ordering {
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def_common_value_ord!($t, self, other)
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}
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}
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impl Display for $t {
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fn fmt(&self, f: &mut Formatter) -> ::std::fmt::Result {
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def_common_value_display!($t, self, f)
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}
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}
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}
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}
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|
|
def_common_value_impl!(Value<Value>);
|
|
def_common_value_impl!(SpannedValue<ValueAndSpan>);
|
|
|
|
impl ValueAndSpan {
|
|
pub fn without_spans(self) -> Value {
|
|
self.inner.into()
|
|
}
|
|
}
|
|
|
|
impl PartialOrd for ValueAndSpan {
|
|
fn partial_cmp(&self, other: &ValueAndSpan) -> Option<Ordering> {
|
|
Some(self.cmp(other))
|
|
}
|
|
}
|
|
|
|
impl Ord for ValueAndSpan {
|
|
fn cmp(&self, other: &ValueAndSpan) -> Ordering {
|
|
self.inner.cmp(&other.inner)
|
|
}
|
|
}
|
|
|
|
impl Display for ValueAndSpan {
|
|
fn fmt(&self, f: &mut Formatter) -> ::std::fmt::Result {
|
|
self.inner.fmt(f)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
extern crate ordered_float;
|
|
extern crate num;
|
|
|
|
use super::*;
|
|
|
|
use std::collections::{BTreeSet, BTreeMap, LinkedList};
|
|
use std::cmp::{Ordering};
|
|
use std::iter::FromIterator;
|
|
use std::f64;
|
|
|
|
use parse;
|
|
|
|
use num::BigInt;
|
|
use ordered_float::OrderedFloat;
|
|
|
|
#[test]
|
|
fn test_value_from() {
|
|
assert_eq!(Value::from_float(42f64), Value::Float(OrderedFloat::from(42f64)));
|
|
assert_eq!(Value::from_ordered_float(OrderedFloat::from(42f64)), Value::Float(OrderedFloat::from(42f64)));
|
|
assert_eq!(Value::from_bigint("42").unwrap(), Value::BigInteger(BigInt::from(42)));
|
|
}
|
|
|
|
#[test]
|
|
fn test_print_edn() {
|
|
let string = "[ 1 2 ( 3.14 ) #{ 4N } { foo/bar 42 :baz/boz 43 } [ ] :five :six/seven eight nine/ten true false nil #f NaN #f -Infinity #f +Infinity ]";
|
|
let data = Value::Vector(vec![
|
|
Value::Integer(1),
|
|
Value::Integer(2),
|
|
Value::List(LinkedList::from_iter(vec![
|
|
Value::from_float(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::from_keyword("baz", "boz"), Value::Integer(43))
|
|
])),
|
|
Value::Vector(vec![]),
|
|
Value::from_keyword(None, "five"),
|
|
Value::from_keyword("six", "seven"),
|
|
Value::from_symbol(None, "eight"),
|
|
Value::from_symbol("nine", "ten"),
|
|
Value::Boolean(true),
|
|
Value::Boolean(false),
|
|
Value::Nil,
|
|
Value::from_float(f64::NAN),
|
|
Value::from_float(f64::NEG_INFINITY),
|
|
Value::from_float(f64::INFINITY),
|
|
]);
|
|
|
|
assert_eq!(string, data.to_string());
|
|
assert_eq!(string, parse::value(&data.to_string()).unwrap().to_string());
|
|
assert_eq!(string, parse::value(&data.to_string()).unwrap().without_spans().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_float(1f64).cmp(&Value::from_float(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);
|
|
}
|
|
}
|