jstrict 0.14.0

Strict RFC 8259 / ECMA-404 JSON parser with source code mapping
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

use criterion::{BenchmarkId, Criterion, Throughput, criterion_group, criterion_main};
use jstrict::{Parse, Value, parse::Options};
use std::hint::black_box;

mod common;

/// Fixtures with serde_json baseline (within serde_json's default recursion limit).
fn fixtures_with_baseline() -> Vec<(&'static str, String)> {
	vec![
		("tiny", common::tiny()),
		("small", common::small()),
		("medium", common::medium()),
		("large", common::large()),
		("wide_object_1k", common::wide_object(1_000)),
		("wide_array_10k", common::wide_array(10_000)),
		("number_heavy_1k", common::number_heavy(1_000)),
		("string_heavy_1k", common::string_heavy(1_000, 0.25)),
		("duplicate_keys", common::duplicate_keys(64, 16)),
	]
}

/// Pathological-depth fixtures — serde_json's default recursion limit (128) rejects these.
fn deep_fixtures() -> Vec<(&'static str, String)> {
	vec![
		("deep_array_256", common::deep_array(256)),
		("deep_object_256", common::deep_object(256)),
	]
}

fn bench_parse_group(c: &mut Criterion, name: &str, input: &str, with_baseline: bool) {
	let mut group = c.benchmark_group(format!("parse/{}", name));
	group.throughput(Throughput::Bytes(input.len() as u64));

	group.bench_with_input(BenchmarkId::new("jstrict", "strict"), input, |b, s| {
		b.iter(|| Value::parse_str(black_box(s)).unwrap());
	});

	let bytes = input.as_bytes().to_vec();
	group.bench_with_input(BenchmarkId::new("jstrict", "slice"), &bytes, |b, s| {
		b.iter(|| Value::parse_slice(black_box(s.as_slice())).unwrap());
	});

	let opts = Options::flexible();
	group.bench_with_input(BenchmarkId::new("jstrict", "flexible"), input, |b, s| {
		b.iter(|| Value::parse_str_with(black_box(s), opts).unwrap());
	});

	if with_baseline {
		group.bench_with_input(BenchmarkId::new("serde_json", "from_str"), input, |b, s| {
			b.iter(|| serde_json::from_str::<serde_json::Value>(black_box(s)).unwrap());
		});
	}

	group.finish();
}

fn bench_parse(c: &mut Criterion) {
	for (name, input) in fixtures_with_baseline() {
		bench_parse_group(c, name, &input, true);
	}
	for (name, input) in deep_fixtures() {
		bench_parse_group(c, name, &input, false);
	}
}

fn bench_parse_pathological(c: &mut Criterion) {
	let mut group = c.benchmark_group("parse_pathological");

	let deep = common::deep_array(1024);
	group.throughput(Throughput::Bytes(deep.len() as u64));
	group.bench_function("deep_array_1024", |b| {
		b.iter(|| Value::parse_str(black_box(deep.as_str())).unwrap())
	});

	let huge = common::huge_number(1024);
	group.throughput(Throughput::Bytes(huge.len() as u64));
	group.bench_function("huge_number_1kb", |b| {
		b.iter(|| Value::parse_str(black_box(huge.as_str())).unwrap())
	});

	let escapes = {
		let mut s = String::from("\"");
		for _ in 0..2_000 {
			s.push_str("\\u00ff");
		}
		s.push('"');
		s
	};
	group.throughput(Throughput::Bytes(escapes.len() as u64));
	group.bench_function("unicode_escape_heavy", |b| {
		b.iter(|| Value::parse_str(black_box(escapes.as_str())).unwrap())
	});

	let surrogates = common::surrogate_heavy(1_000);
	group.throughput(Throughput::Bytes(surrogates.len() as u64));
	group.bench_function("surrogate_pair_heavy_strict", |b| {
		b.iter(|| Value::parse_str(black_box(surrogates.as_str())).unwrap())
	});
	let flex = Options::flexible();
	group.bench_function("surrogate_pair_heavy_flexible", |b| {
		b.iter(|| Value::parse_str_with(black_box(surrogates.as_str()), flex).unwrap())
	});

	group.finish();
}

/// Mirror of `bench_parse` but using `parse_str_value` / `parse_slice_value`,
/// the no-`CodeMap` entry points. This delta vs `parse/*` measures the
/// `Mapper` monomorphisation win.
fn bench_parse_value(c: &mut Criterion) {
	for (name, input) in fixtures_with_baseline() {
		let mut group = c.benchmark_group(format!("parse_value/{}", name));
		group.throughput(Throughput::Bytes(input.len() as u64));

		group.bench_with_input(
			BenchmarkId::new("jstrict", "str_value"),
			input.as_str(),
			|b, s| b.iter(|| jstrict::parse::parse_str_value(black_box(s)).unwrap()),
		);

		let bytes = input.as_bytes().to_vec();
		group.bench_with_input(
			BenchmarkId::new("jstrict", "slice_value"),
			&bytes,
			|b, s| b.iter(|| jstrict::parse::parse_slice_value(black_box(s.as_slice())).unwrap()),
		);

		group.bench_with_input(
			BenchmarkId::new("serde_json", "from_str"),
			input.as_str(),
			|b, s| b.iter(|| serde_json::from_str::<serde_json::Value>(black_box(s)).unwrap()),
		);

		group.finish();
	}
}

criterion_group!(
	benches,
	bench_parse,
	bench_parse_pathological,
	bench_parse_value
);
criterion_main!(benches);