Move json into testutil module
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@ -5,6 +5,9 @@ edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[features]
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testutil = []
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[dependencies]
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arbitrary = "1.2.0"
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proptest = "1.0.0"
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@ -12,6 +15,8 @@ proptest = "1.0.0"
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[dev-dependencies]
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criterion = "0.4.0"
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rstest = "0.16.0"
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# see https://github.com/rust-lang/cargo/issues/2911#issuecomment-749580481
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parser-combinator = { path = ".", features = ["testutil"] }
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[[bench]]
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name = "json-benchmark"
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@ -4,4 +4,7 @@ mod parser;
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pub mod primitives;
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pub mod sequence;
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#[cfg(feature = "testutil")]
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pub mod testutil;
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pub use parser::{ParseResult, Parser, ParserInput, Representation};
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135
src/testutil/mod.rs
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135
src/testutil/mod.rs
Normal file
@ -0,0 +1,135 @@
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use crate::choice::choice;
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use crate::combinators::repeated;
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use crate::primitives::{any_char, literal, literal_char, one_of, pred};
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use crate::sequence::seq;
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use crate::Parser;
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/*
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* JSON BNF
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* <JSON> ::= <value>
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<value> ::= <object> | <array> | <boolean> | <string> | <number> | <null>
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<array> ::= "[" [<value>] {"," <value>}* "]"
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<object> ::= "{" [<property>] {"," <property>}* "}"
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<property> ::= <string> ":" <value>
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*/
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#[derive(Debug, Clone, PartialEq)]
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pub enum JsonValue {
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Null,
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Bool(bool),
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Str(String),
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Num(f64),
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Array(Vec<JsonValue>),
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Object(Vec<(String, JsonValue)>),
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}
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pub trait JsonParser<'a, T>: Parser<&'a str, T, &'a str> {}
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impl<'a, T, P> JsonParser<'a, T> for P where P: Parser<&'a str, T, &'a str> {}
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pub fn json_null<'a>() -> impl JsonParser<'a, JsonValue> {
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literal("null").to(JsonValue::Null)
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}
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pub fn json_bool<'a>() -> impl JsonParser<'a, JsonValue> {
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choice((
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literal("true").to(JsonValue::Bool(true)),
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literal("false").to(JsonValue::Bool(false)),
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))
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}
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pub fn json_number<'a>() -> impl JsonParser<'a, JsonValue> {
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fn digit<'a>() -> impl JsonParser<'a, &'a str> {
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one_of("1234567890")
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}
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fn digits<'a>() -> impl JsonParser<'a, Vec<&'a str>> {
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repeated(digit()).at_least(1)
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}
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let json_number_inner = choice((
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seq((digits(), literal(".").ignore_then(digits()).optional())).map(
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|(mut digits, maybe_decimal)| {
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if let Some(decimal_digits) = maybe_decimal {
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digits.push(".");
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digits.extend(decimal_digits.into_iter());
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}
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digits.into_iter().collect::<String>()
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},
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),
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literal(".").ignore_then(digits()).map(|decimal_digits| {
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let mut d = vec!["."];
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d.extend(decimal_digits.into_iter());
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d.into_iter().collect::<String>()
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}),
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))
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.map(|digits| digits.parse::<f64>().unwrap());
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literal("-")
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.optional()
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.then(json_number_inner)
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.map(|(maybe_sign, mut val)| {
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if maybe_sign.is_some() {
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val *= -1.0;
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}
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JsonValue::Num(val)
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})
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}
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pub fn json_string_raw<'a>() -> impl JsonParser<'a, String> {
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seq((
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literal_char('"'),
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repeated(pred(any_char, |ch| *ch != '"')),
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literal_char('"'),
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))
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.map(|(_, s, _)| s.iter().cloned().collect::<String>())
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}
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pub fn json_string<'a>() -> impl JsonParser<'a, JsonValue> {
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json_string_raw().map(JsonValue::Str)
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}
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fn whitespace<'a>() -> impl JsonParser<'a, ()> {
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repeated(choice((
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literal_char('\t'),
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literal_char('\n'),
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literal_char(' '),
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)))
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.to(())
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}
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pub fn json_array<'a>() -> impl JsonParser<'a, JsonValue> {
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move |input| {
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let val = json_value().surrounded_by(whitespace());
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repeated(val)
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.separated_by(literal(","), false)
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.delimited(literal_char('['), literal_char(']'))
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.map(JsonValue::Array)
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.parse(input)
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}
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}
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pub fn json_object<'a>() -> impl JsonParser<'a, JsonValue> {
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move |input| {
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let kv = json_string_raw()
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.surrounded_by(whitespace())
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.then_ignore(literal_char(':'))
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.then(json_value().surrounded_by(whitespace()));
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repeated(kv)
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.separated_by(literal_char(','), false)
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.delimited(literal_char('{'), literal_char('}'))
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.map(JsonValue::Object)
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.parse(input)
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}
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}
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pub fn json_value<'a>() -> impl JsonParser<'a, JsonValue> {
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choice((
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json_null(),
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json_bool(),
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json_number(),
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json_string(),
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json_array(),
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json_object(),
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))
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}
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@ -1,9 +1,8 @@
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use parser_combinator::choice::choice;
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use parser_combinator::combinators::repeated;
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use parser_combinator::primitives::{any_char, literal, literal_char, one_of, pred};
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use parser_combinator::sequence::seq;
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use parser_combinator::Parser;
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use parser_combinator::Representation;
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use parser_combinator::primitives::literal;
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use parser_combinator::testutil::{
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json_array, json_bool, json_null, json_number, json_object, json_string, JsonValue,
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};
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use parser_combinator::{Parser, Representation};
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use proptest::prelude::*;
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@ -32,136 +31,6 @@ fn test_parsing() {
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assert_eq!(output.unwrap(), ("a", " yolo"));
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}
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/*
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* JSON BNF
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* <JSON> ::= <value>
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<value> ::= <object> | <array> | <boolean> | <string> | <number> | <null>
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<array> ::= "[" [<value>] {"," <value>}* "]"
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<object> ::= "{" [<property>] {"," <property>}* "}"
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<property> ::= <string> ":" <value>
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*/
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#[derive(Debug, Clone, PartialEq)]
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enum JsonValue {
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Null,
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Bool(bool),
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Str(String),
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Num(f64),
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Array(Vec<JsonValue>),
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Object(Vec<(String, JsonValue)>),
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}
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trait JsonParser<'a, T>: Parser<&'a str, T, &'a str> {}
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impl<'a, T, P> JsonParser<'a, T> for P where P: Parser<&'a str, T, &'a str> {}
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fn json_null<'a>() -> impl JsonParser<'a, JsonValue> {
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literal("null").to(JsonValue::Null)
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}
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fn json_bool<'a>() -> impl JsonParser<'a, JsonValue> {
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choice((
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literal("true").to(JsonValue::Bool(true)),
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literal("false").to(JsonValue::Bool(false)),
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))
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}
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fn json_number<'a>() -> impl JsonParser<'a, JsonValue> {
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fn digit<'a>() -> impl JsonParser<'a, &'a str> {
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one_of("1234567890")
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}
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fn digits<'a>() -> impl JsonParser<'a, Vec<&'a str>> {
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repeated(digit()).at_least(1)
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}
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let json_number_inner = choice((
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seq((digits(), literal(".").ignore_then(digits()).optional())).map(
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|(mut digits, maybe_decimal)| {
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if let Some(decimal_digits) = maybe_decimal {
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digits.push(".");
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digits.extend(decimal_digits.into_iter());
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}
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digits.into_iter().collect::<String>()
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},
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),
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literal(".").ignore_then(digits()).map(|decimal_digits| {
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let mut d = vec!["."];
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d.extend(decimal_digits.into_iter());
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d.into_iter().collect::<String>()
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}),
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))
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.map(|digits| digits.parse::<f64>().unwrap());
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literal("-")
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.optional()
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.then(json_number_inner)
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.map(|(maybe_sign, mut val)| {
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if maybe_sign.is_some() {
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val *= -1.0;
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}
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JsonValue::Num(val)
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})
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}
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fn json_string_raw<'a>() -> impl JsonParser<'a, String> {
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seq((
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literal_char('"'),
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repeated(pred(any_char, |ch| *ch != '"')),
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literal_char('"'),
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))
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.map(|(_, s, _)| s.iter().cloned().collect::<String>())
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}
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fn json_string<'a>() -> impl JsonParser<'a, JsonValue> {
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json_string_raw().map(JsonValue::Str)
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}
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fn whitespace<'a>() -> impl JsonParser<'a, ()> {
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repeated(choice((
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literal_char('\t'),
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literal_char('\n'),
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literal_char(' '),
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)))
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.to(())
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}
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fn json_array<'a>() -> impl JsonParser<'a, JsonValue> {
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move |input| {
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let val = json_value().surrounded_by(whitespace());
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repeated(val)
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.separated_by(literal(","), false)
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.delimited(literal_char('['), literal_char(']'))
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.map(JsonValue::Array)
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.parse(input)
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}
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}
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fn json_object<'a>() -> impl JsonParser<'a, JsonValue> {
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move |input| {
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let kv = json_string_raw()
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.surrounded_by(whitespace())
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.then_ignore(literal_char(':'))
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.then(json_value().surrounded_by(whitespace()));
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repeated(kv)
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.separated_by(literal_char(','), false)
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.delimited(literal_char('{'), literal_char('}'))
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.map(JsonValue::Object)
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.parse(input)
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}
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}
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fn json_value<'a>() -> impl JsonParser<'a, JsonValue> {
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choice((
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json_null(),
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json_bool(),
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json_number(),
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json_string(),
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json_array(),
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json_object(),
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))
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}
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#[test]
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fn parse_json_primitives() {
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assert_eq!(
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