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winnow-0.5.15/Cargo.toml 0000644 00000010264 00000000001 0010446 0 ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.64.0"
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autoexamples = false
description = "A byte-oriented, zero-copy, parser combinators library"
readme = "README.md"
keywords = [
"parser",
"parser-combinators",
"parsing",
"streaming",
"bit",
]
categories = ["parsing"]
license = "MIT"
repository = "https://github.com/winnow-rs/winnow"
[package.metadata.docs.rs]
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alloc = []
debug = [
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]
default = ["std"]
simd = ["dep:memchr"]
std = [
"alloc",
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unstable-doc = [
"alloc",
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resolver = "2"
members = ["fuzz"]
[workspace.package]
license = "MIT"
edition = "2021"
rust-version = "1.64.0" # MSRV
include = [
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"Cargo.lock",
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name = "winnow"
version = "0.5.15"
description = "A byte-oriented, zero-copy, parser combinators library"
repository = "https://github.com/winnow-rs/winnow"
categories = ["parsing"]
keywords = ["parser", "parser-combinators", "parsing", "streaming", "bit"]
autoexamples = false
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[features]
default = ["std"]
alloc = []
std = ["alloc", "memchr?/std"]
simd = ["dep:memchr"]
debug = ["dep:anstream", "dep:anstyle", "dep:is-terminal", "dep:terminal_size"]
unstable-doc = ["alloc", "std", "simd"]
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terminal_size = { version = "0.2.6", optional = true }
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required-features = ["alloc"]
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test = true
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name = "json_iterator"
required-features = ["std"]
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name = "iterator"
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name = "s_expression"
required-features = ["alloc"]
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name = "string"
required-features = ["alloc"]
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path = "examples/arithmetic/bench.rs"
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name = "contains_token"
harness = false
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harness = false
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name = "number"
harness = false
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name = "http"
path = "examples/http/bench.rs"
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required-features = ["alloc"]
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name = "ini"
path = "examples/ini/bench.rs"
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harness = false
required-features = ["std"]
winnow-0.5.15/LICENSE-MIT 0000644 0000000 0000000 00000001777 10461020230 0012705 0 ustar 0000000 0000000 Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
winnow-0.5.15/README.md 0000644 0000000 0000000 00000002571 10461020230 0012521 0 ustar 0000000 0000000 # winnow, making parsing a breeze
[](LICENSE)
[](https://github.com/winnow-rs/winnow/actions/workflows/ci.yml)
[](https://coveralls.io/github/winnow-rs/winnow?branch=main)
[](https://crates.io/crates/winnow)
## About
Build up a parser for your format of choice with the building blocks provided by `winnow`.
For more details, see:
- [Tutorial](https://docs.rs/winnow/latest/winnow/_tutorial/index.html)
- [Special Topics](https://docs.rs/winnow/latest/winnow/_topic/index.html)
- [Why winnow? How does it compare to ...?](https://docs.rs/winnow/latest/winnow/_topic/why/index.html)
- [API Reference](https://docs.rs/winnow)
- [List of combinators](https://docs.rs/winnow/latest/winnow/combinator/index.html)
# Contributors
winnow is the fruit of the work of many contributors over the years, many
thanks for your help! In particular, thanks to [Geal](https://github.com/Geal)
for the original [`nom` crate](https://crates.io/crates/nom).
winnow-0.5.15/benches/contains_token.rs 0000644 0000000 0000000 00000007532 10461020230 0016237 0 ustar 0000000 0000000 use criterion::black_box;
use winnow::combinator::alt;
use winnow::combinator::repeat;
use winnow::prelude::*;
use winnow::token::take_till1;
use winnow::token::take_while;
fn contains_token(c: &mut criterion::Criterion) {
let data = [
("contiguous", CONTIGUOUS),
("interleaved", INTERLEAVED),
("canada", CANADA),
];
let mut group = c.benchmark_group("contains_token");
for (name, sample) in data {
let len = sample.len();
group.throughput(criterion::Throughput::Bytes(len as u64));
group.bench_with_input(criterion::BenchmarkId::new("slice", name), &len, |b, _| {
b.iter(|| black_box(parser_slice.parse_peek(black_box(sample)).unwrap()));
});
group.bench_with_input(criterion::BenchmarkId::new("array", name), &len, |b, _| {
b.iter(|| black_box(parser_array.parse_peek(black_box(sample)).unwrap()));
});
group.bench_with_input(criterion::BenchmarkId::new("tuple", name), &len, |b, _| {
b.iter(|| black_box(parser_tuple.parse_peek(black_box(sample)).unwrap()));
});
group.bench_with_input(
criterion::BenchmarkId::new("closure-or", name),
&len,
|b, _| {
b.iter(|| black_box(parser_closure_or.parse_peek(black_box(sample)).unwrap()));
},
);
group.bench_with_input(
criterion::BenchmarkId::new("closure-matches", name),
&len,
|b, _| {
b.iter(|| {
black_box(
parser_closure_matches
.parse_peek(black_box(sample))
.unwrap(),
)
});
},
);
}
group.finish();
}
fn parser_slice(input: &mut &str) -> PResult {
let contains = &['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'][..];
repeat(0.., alt((take_while(1.., contains), take_till1(contains)))).parse_next(input)
}
fn parser_array(input: &mut &str) -> PResult {
let contains = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
repeat(0.., alt((take_while(1.., contains), take_till1(contains)))).parse_next(input)
}
fn parser_tuple(input: &mut &str) -> PResult {
let contains = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
repeat(0.., alt((take_while(1.., contains), take_till1(contains)))).parse_next(input)
}
fn parser_closure_or(input: &mut &str) -> PResult {
let contains = |c: char| {
c == '0'
|| c == '1'
|| c == '2'
|| c == '3'
|| c == '4'
|| c == '5'
|| c == '6'
|| c == '7'
|| c == '8'
|| c == '9'
};
repeat(0.., alt((take_while(1.., contains), take_till1(contains)))).parse_next(input)
}
fn parser_closure_matches(input: &mut &str) -> PResult {
let contains = |c: char| matches!(c, '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9');
repeat(0.., alt((take_while(1.., contains), take_till1(contains)))).parse_next(input)
}
const CONTIGUOUS: &str = "012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789";
const INTERLEAVED: &str = "0123456789abc0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab";
const CANADA: &str = include_str!("../third_party/nativejson-benchmark/data/canada.json");
criterion::criterion_group!(benches, contains_token);
criterion::criterion_main!(benches);
winnow-0.5.15/benches/iter.rs 0000644 0000000 0000000 00000007737 10461020230 0014173 0 ustar 0000000 0000000 use criterion::black_box;
use winnow::combinator::opt;
use winnow::prelude::*;
use winnow::stream::AsChar;
use winnow::stream::Stream as _;
use winnow::token::one_of;
fn iter(c: &mut criterion::Criterion) {
let data = [
("contiguous", CONTIGUOUS.as_bytes()),
("interleaved", INTERLEAVED.as_bytes()),
("canada", CANADA.as_bytes()),
];
let mut group = c.benchmark_group("iter");
for (name, sample) in data {
let len = sample.len();
group.throughput(criterion::Throughput::Bytes(len as u64));
group.bench_with_input(
criterion::BenchmarkId::new("iterate", name),
&len,
|b, _| {
b.iter(|| black_box(iterate.parse_peek(black_box(sample)).unwrap()));
},
);
group.bench_with_input(
criterion::BenchmarkId::new("next_token", name),
&len,
|b, _| {
b.iter(|| black_box(next_token.parse_peek(black_box(sample)).unwrap()));
},
);
group.bench_with_input(
criterion::BenchmarkId::new("opt(one_of)", name),
&len,
|b, _| {
b.iter(|| black_box(opt_one_of.parse_peek(black_box(sample)).unwrap()));
},
);
group.bench_with_input(
criterion::BenchmarkId::new("take_while", name),
&len,
|b, _| {
b.iter(|| black_box(take_while.parse_peek(black_box(sample)).unwrap()));
},
);
group.bench_with_input(criterion::BenchmarkId::new("repeat", name), &len, |b, _| {
b.iter(|| black_box(repeat.parse_peek(black_box(sample)).unwrap()));
});
}
group.finish();
}
fn iterate(input: &mut &[u8]) -> PResult {
let mut count = 0;
for byte in input.iter() {
if byte.is_dec_digit() {
count += 1;
}
}
input.finish();
Ok(count)
}
fn next_token(input: &mut &[u8]) -> PResult {
let mut count = 0;
while let Some(byte) = input.next_token() {
if byte.is_dec_digit() {
count += 1;
}
}
Ok(count)
}
fn opt_one_of(input: &mut &[u8]) -> PResult {
let mut count = 0;
while !input.is_empty() {
while opt(one_of(AsChar::is_dec_digit))
.parse_next(input)?
.is_some()
{
count += 1;
}
while opt(one_of(|b: u8| !b.is_dec_digit()))
.parse_next(input)?
.is_some()
{}
}
Ok(count)
}
fn take_while(input: &mut &[u8]) -> PResult {
let mut count = 0;
while !input.is_empty() {
count += winnow::token::take_while(0.., AsChar::is_dec_digit)
.parse_next(input)?
.len();
let _ = winnow::token::take_while(0.., |b: u8| !b.is_dec_digit()).parse_next(input)?;
}
Ok(count)
}
fn repeat(input: &mut &[u8]) -> PResult {
let mut count = 0;
while !input.is_empty() {
count += winnow::combinator::repeat(0.., one_of(AsChar::is_dec_digit))
.map(|count: usize| count)
.parse_next(input)?;
winnow::combinator::repeat(0.., one_of(|b: u8| !b.is_dec_digit())).parse_next(input)?;
}
Ok(count)
}
const CONTIGUOUS: &str = "012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789";
const INTERLEAVED: &str = "0123456789abc0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab0123456789ab";
const CANADA: &str = include_str!("../third_party/nativejson-benchmark/data/canada.json");
criterion::criterion_group!(benches, iter);
criterion::criterion_main!(benches);
winnow-0.5.15/benches/number.rs 0000644 0000000 0000000 00000003437 10461020230 0014511 0 ustar 0000000 0000000 #[macro_use]
extern crate criterion;
use criterion::Criterion;
use winnow::ascii::float;
use winnow::binary::be_u64;
use winnow::error::ErrMode;
use winnow::error::ErrorKind;
use winnow::error::InputError;
use winnow::error::ParserError;
use winnow::prelude::*;
use winnow::stream::ParseSlice;
type Stream<'i> = &'i [u8];
fn parser(i: &mut Stream<'_>) -> PResult {
be_u64.parse_next(i)
}
fn number(c: &mut Criterion) {
let data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
parser
.parse_peek(&data[..])
.expect("should parse correctly");
c.bench_function("number", move |b| {
b.iter(|| parser.parse_peek(&data[..]).unwrap());
});
}
fn float_bytes(c: &mut Criterion) {
println!(
"float_bytes result: {:?}",
float::<_, f64, InputError<_>>.parse_peek(&b"-1.234E-12"[..])
);
c.bench_function("float bytes", |b| {
b.iter(|| float::<_, f64, InputError<_>>.parse_peek(&b"-1.234E-12"[..]));
});
}
fn float_str(c: &mut Criterion) {
println!(
"float_str result: {:?}",
float::<_, f64, InputError<_>>.parse_peek("-1.234E-12")
);
c.bench_function("float str", |b| {
b.iter(|| float::<_, f64, InputError<_>>.parse_peek("-1.234E-12"));
});
}
fn std_float(input: &mut &[u8]) -> PResult {
match input.parse_slice() {
Some(n) => Ok(n),
None => Err(ErrMode::from_error_kind(input, ErrorKind::Slice)),
}
}
fn std_float_bytes(c: &mut Criterion) {
println!(
"std_float_bytes result: {:?}",
std_float.parse_peek(&b"-1.234E-12"[..])
);
c.bench_function("std_float bytes", |b| {
b.iter(|| std_float.parse_peek(&b"-1.234E-12"[..]));
});
}
criterion_group!(benches, number, float_bytes, std_float_bytes, float_str);
criterion_main!(benches);
winnow-0.5.15/examples/arithmetic/bench.rs 0000644 0000000 0000000 00000001033 10461020230 0016626 0 ustar 0000000 0000000 mod parser;
use winnow::prelude::*;
use parser::expr;
#[allow(clippy::eq_op, clippy::erasing_op)]
fn arithmetic(c: &mut criterion::Criterion) {
let data = " 2*2 / ( 5 - 1) + 3 / 4 * (2 - 7 + 567 *12 /2) + 3*(1+2*( 45 /2));";
assert_eq!(
expr.parse_peek(data),
Ok((";", 2 * 2 / (5 - 1) + 3 * (1 + 2 * (45 / 2)),))
);
c.bench_function("arithmetic", |b| {
b.iter(|| expr.parse_peek(data).unwrap());
});
}
criterion::criterion_group!(benches, arithmetic);
criterion::criterion_main!(benches);
winnow-0.5.15/examples/arithmetic/main.rs 0000644 0000000 0000000 00000003256 10461020230 0016504 0 ustar 0000000 0000000 use winnow::prelude::*;
mod parser;
mod parser_ast;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let input = args.input.as_deref().unwrap_or("1 + 1");
println!("{} =", input);
match args.implementation {
Impl::Eval => match parser::expr.parse(input) {
Ok(result) => {
println!(" {}", result);
}
Err(err) => {
println!(" {}", err);
}
},
Impl::Ast => match parser_ast::expr.parse(input) {
Ok(result) => {
println!(" {:#?}", result);
}
Err(err) => {
println!(" {}", err);
}
},
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
implementation: Impl,
}
enum Impl {
Eval,
Ast,
}
impl Default for Impl {
fn default() -> Self {
Self::Eval
}
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Long("impl") => {
res.implementation = args.value()?.parse_with(|s| match s {
"eval" => Ok(Impl::Eval),
"ast" => Ok(Impl::Ast),
_ => Err("expected `eval`, `ast`"),
})?;
}
Value(input) => {
res.input = Some(input.string()?);
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
winnow-0.5.15/examples/arithmetic/parser.rs 0000644 0000000 0000000 00000005154 10461020230 0017053 0 ustar 0000000 0000000 use std::str::FromStr;
use winnow::prelude::*;
use winnow::{
ascii::{digit1 as digits, space0 as spaces},
combinator::alt,
combinator::delimited,
combinator::fold_repeat,
token::one_of,
};
// Parser definition
pub fn expr(i: &mut &str) -> PResult {
let init = term.parse_next(i)?;
fold_repeat(
0..,
(one_of(['+', '-']), term),
move || init,
|acc, (op, val): (char, i64)| {
if op == '+' {
acc + val
} else {
acc - val
}
},
)
.parse_next(i)
}
// We read an initial factor and for each time we find
// a * or / operator followed by another factor, we do
// the math by folding everything
fn term(i: &mut &str) -> PResult {
let init = factor.parse_next(i)?;
fold_repeat(
0..,
(one_of(['*', '/']), factor),
move || init,
|acc, (op, val): (char, i64)| {
if op == '*' {
acc * val
} else {
acc / val
}
},
)
.parse_next(i)
}
// We transform an integer string into a i64, ignoring surrounding whitespaces
// We look for a digit suite, and try to convert it.
// If either str::from_utf8 or FromStr::from_str fail,
// we fallback to the parens parser defined above
fn factor(i: &mut &str) -> PResult {
delimited(
spaces,
alt((
digits.try_map(FromStr::from_str),
delimited('(', expr, ')'),
parens,
)),
spaces,
)
.parse_next(i)
}
// We parse any expr surrounded by parens, ignoring all whitespaces around those
fn parens(i: &mut &str) -> PResult {
delimited('(', expr, ')').parse_next(i)
}
#[test]
fn factor_test() {
assert_eq!(factor.parse_peek("3"), Ok(("", 3)));
assert_eq!(factor.parse_peek(" 12"), Ok(("", 12)));
assert_eq!(factor.parse_peek("537 "), Ok(("", 537)));
assert_eq!(factor.parse_peek(" 24 "), Ok(("", 24)));
}
#[test]
fn term_test() {
assert_eq!(term.parse_peek(" 12 *2 / 3"), Ok(("", 8)));
assert_eq!(term.parse_peek(" 2* 3 *2 *2 / 3"), Ok(("", 8)));
assert_eq!(term.parse_peek(" 48 / 3/2"), Ok(("", 8)));
}
#[test]
fn expr_test() {
assert_eq!(expr.parse_peek(" 1 + 2 "), Ok(("", 3)));
assert_eq!(expr.parse_peek(" 12 + 6 - 4+ 3"), Ok(("", 17)));
assert_eq!(expr.parse_peek(" 1 + 2*3 + 4"), Ok(("", 11)));
}
#[test]
fn parens_test() {
assert_eq!(expr.parse_peek(" ( 2 )"), Ok(("", 2)));
assert_eq!(expr.parse_peek(" 2* ( 3 + 4 ) "), Ok(("", 14)));
assert_eq!(expr.parse_peek(" 2*2 / ( 5 - 1) + 3"), Ok(("", 4)));
}
winnow-0.5.15/examples/arithmetic/parser_ast.rs 0000644 0000000 0000000 00000010371 10461020230 0017717 0 ustar 0000000 0000000 use std::fmt;
use std::fmt::{Debug, Display, Formatter};
use std::str::FromStr;
use winnow::prelude::*;
use winnow::{
ascii::{digit1 as digit, multispace0 as multispace},
combinator::alt,
combinator::repeat,
combinator::{delimited, preceded},
};
#[derive(Debug)]
pub enum Expr {
Value(i64),
Add(Box, Box),
Sub(Box, Box),
Mul(Box, Box),
Div(Box, Box),
Paren(Box),
}
#[derive(Debug)]
pub enum Oper {
Add,
Sub,
Mul,
Div,
}
impl Display for Expr {
fn fmt(&self, format: &mut Formatter<'_>) -> fmt::Result {
use Expr::{Add, Div, Mul, Paren, Sub, Value};
match *self {
Value(val) => write!(format, "{}", val),
Add(ref left, ref right) => write!(format, "{} + {}", left, right),
Sub(ref left, ref right) => write!(format, "{} - {}", left, right),
Mul(ref left, ref right) => write!(format, "{} * {}", left, right),
Div(ref left, ref right) => write!(format, "{} / {}", left, right),
Paren(ref expr) => write!(format, "({})", expr),
}
}
}
pub fn expr(i: &mut &str) -> PResult {
let initial = term(i)?;
let remainder = repeat(
0..,
alt((
|i: &mut &str| {
let add = preceded("+", term).parse_next(i)?;
Ok((Oper::Add, add))
},
|i: &mut &str| {
let sub = preceded("-", term).parse_next(i)?;
Ok((Oper::Sub, sub))
},
)),
)
.parse_next(i)?;
Ok(fold_exprs(initial, remainder))
}
fn term(i: &mut &str) -> PResult {
let initial = factor(i)?;
let remainder = repeat(
0..,
alt((
|i: &mut &str| {
let mul = preceded("*", factor).parse_next(i)?;
Ok((Oper::Mul, mul))
},
|i: &mut &str| {
let div = preceded("/", factor).parse_next(i)?;
Ok((Oper::Div, div))
},
)),
)
.parse_next(i)?;
Ok(fold_exprs(initial, remainder))
}
fn factor(i: &mut &str) -> PResult {
alt((
delimited(multispace, digit, multispace)
.try_map(FromStr::from_str)
.map(Expr::Value),
parens,
))
.parse_next(i)
}
fn parens(i: &mut &str) -> PResult {
delimited(
multispace,
delimited("(", expr.map(|e| Expr::Paren(Box::new(e))), ")"),
multispace,
)
.parse_next(i)
}
fn fold_exprs(initial: Expr, remainder: Vec<(Oper, Expr)>) -> Expr {
remainder.into_iter().fold(initial, |acc, pair| {
let (oper, expr) = pair;
match oper {
Oper::Add => Expr::Add(Box::new(acc), Box::new(expr)),
Oper::Sub => Expr::Sub(Box::new(acc), Box::new(expr)),
Oper::Mul => Expr::Mul(Box::new(acc), Box::new(expr)),
Oper::Div => Expr::Div(Box::new(acc), Box::new(expr)),
}
})
}
#[test]
fn factor_test() {
assert_eq!(
factor
.parse_peek(" 3 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok(("", String::from("Value(3)")))
);
}
#[test]
fn term_test() {
assert_eq!(
term.parse_peek(" 3 * 5 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok(("", String::from("Mul(Value(3), Value(5))")))
);
}
#[test]
fn expr_test() {
assert_eq!(
expr.parse_peek(" 1 + 2 * 3 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok(("", String::from("Add(Value(1), Mul(Value(2), Value(3)))")))
);
assert_eq!(
expr.parse_peek(" 1 + 2 * 3 / 4 - 5 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok((
"",
String::from("Sub(Add(Value(1), Div(Mul(Value(2), Value(3)), Value(4))), Value(5))")
))
);
assert_eq!(
expr.parse_peek(" 72 / 2 / 3 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok(("", String::from("Div(Div(Value(72), Value(2)), Value(3))")))
);
}
#[test]
fn parens_test() {
assert_eq!(
expr.parse_peek(" ( 1 + 2 ) * 3 ")
.map(|(i, x)| (i, format!("{:?}", x))),
Ok((
"",
String::from("Mul(Paren(Add(Value(1), Value(2))), Value(3))")
))
);
}
winnow-0.5.15/examples/css/main.rs 0000644 0000000 0000000 00000002257 10461020230 0015143 0 ustar 0000000 0000000 use winnow::prelude::*;
mod parser;
use parser::hex_color;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let input = args.input.as_deref().unwrap_or("#AAAAAA");
println!("{} =", input);
match hex_color.parse(input) {
Ok(result) => {
println!(" {:?}", result);
}
Err(err) => {
println!(" {}", err);
}
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Value(input) => {
res.input = Some(input.string()?);
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
#[test]
fn parse_color() {
assert_eq!(
hex_color.parse_peek("#2F14DF"),
Ok((
"",
parser::Color {
red: 47,
green: 20,
blue: 223,
}
))
);
}
winnow-0.5.15/examples/css/parser.rs 0000644 0000000 0000000 00000001410 10461020230 0015501 0 ustar 0000000 0000000 use winnow::prelude::*;
use winnow::token::take_while;
#[derive(Debug, Eq, PartialEq)]
pub struct Color {
pub red: u8,
pub green: u8,
pub blue: u8,
}
impl std::str::FromStr for Color {
// The error must be owned
type Err = String;
fn from_str(s: &str) -> Result {
hex_color.parse(s).map_err(|e| e.to_string())
}
}
pub fn hex_color(input: &mut &str) -> PResult {
let _ = "#".parse_next(input)?;
let (red, green, blue) = (hex_primary, hex_primary, hex_primary).parse_next(input)?;
Ok(Color { red, green, blue })
}
fn hex_primary(input: &mut &str) -> PResult {
take_while(2, |c: char| c.is_ascii_hexdigit())
.try_map(|input| u8::from_str_radix(input, 16))
.parse_next(input)
}
winnow-0.5.15/examples/custom_error.rs 0000644 0000000 0000000 00000001606 10461020230 0016147 0 ustar 0000000 0000000 use winnow::error::ErrMode;
use winnow::error::ErrorKind;
use winnow::error::ParserError;
use winnow::prelude::*;
#[derive(Debug, PartialEq, Eq)]
pub enum CustomError {
MyError,
Nom(I, ErrorKind),
}
impl ParserError for CustomError {
fn from_error_kind(input: &I, kind: ErrorKind) -> Self {
CustomError::Nom(input.clone(), kind)
}
fn append(self, _: &I, _: ErrorKind) -> Self {
self
}
}
pub fn parse<'s>(_input: &mut &'s str) -> PResult<&'s str, CustomError<&'s str>> {
Err(ErrMode::Backtrack(CustomError::MyError))
}
fn main() {}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let err = parse.parse_next(&mut "").unwrap_err();
match err {
ErrMode::Backtrack(e) => assert_eq!(e, CustomError::MyError),
_ => panic!("Unexpected error: {:?}", err),
}
}
}
winnow-0.5.15/examples/http/bench.rs 0000644 0000000 0000000 00000002021 10461020230 0015452 0 ustar 0000000 0000000 mod parser;
mod parser_streaming;
fn one_test(c: &mut criterion::Criterion) {
let data = &b"GET / HTTP/1.1
Host: www.reddit.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20100101 Firefox/15.0.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
"[..];
let mut http_group = c.benchmark_group("http");
http_group.throughput(criterion::Throughput::Bytes(data.len() as u64));
http_group.bench_with_input(
criterion::BenchmarkId::new("complete", data.len()),
data,
|b, data| {
b.iter(|| parser::parse(data).unwrap());
},
);
http_group.bench_with_input(
criterion::BenchmarkId::new("streaming", data.len()),
data,
|b, data| {
b.iter(|| parser_streaming::parse(data).unwrap());
},
);
http_group.finish();
}
criterion::criterion_group!(http, one_test);
criterion::criterion_main!(http);
winnow-0.5.15/examples/http/main.rs 0000644 0000000 0000000 00000002076 10461020230 0015331 0 ustar 0000000 0000000 mod parser;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let input = args.input.as_deref().unwrap_or(
"GET / HTTP/1.1
Host: www.reddit.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20100101 Firefox/15.0.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
",
);
if let Some(result) = parser::parse(input.as_bytes()) {
println!(" {:#?}", result);
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Value(input) => {
res.input = Some(input.string()?);
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
winnow-0.5.15/examples/http/parser.rs 0000644 0000000 0000000 00000006344 10461020230 0015703 0 ustar 0000000 0000000 use winnow::prelude::*;
use winnow::{ascii::line_ending, combinator::repeat, token::take_while};
pub type Stream<'i> = &'i [u8];
#[rustfmt::skip]
#[derive(Debug)]
#[allow(dead_code)]
pub struct Request<'a> {
method: &'a [u8],
uri: &'a [u8],
version: &'a [u8],
}
#[derive(Debug)]
#[allow(dead_code)]
pub struct Header<'a> {
name: &'a [u8],
value: Vec<&'a [u8]>,
}
pub fn parse(data: &[u8]) -> Option, Vec>)>> {
let mut buf = data;
let mut v = Vec::new();
loop {
match request(&mut buf) {
Ok(r) => {
v.push(r);
if buf.is_empty() {
//println!("{}", i);
break;
}
}
Err(e) => {
println!("error: {:?}", e);
return None;
}
}
}
Some(v)
}
fn request<'s>(input: &mut Stream<'s>) -> PResult<(Request<'s>, Vec>)> {
let req = request_line(input)?;
let h = repeat(1.., message_header).parse_next(input)?;
let _ = line_ending.parse_next(input)?;
Ok((req, h))
}
fn request_line<'s>(input: &mut Stream<'s>) -> PResult> {
let method = take_while(1.., is_token).parse_next(input)?;
let _ = take_while(1.., is_space).parse_next(input)?;
let uri = take_while(1.., is_not_space).parse_next(input)?;
let _ = take_while(1.., is_space).parse_next(input)?;
let version = http_version(input)?;
let _ = line_ending.parse_next(input)?;
Ok(Request {
method,
uri,
version,
})
}
fn http_version<'s>(input: &mut Stream<'s>) -> PResult<&'s [u8]> {
let _ = "HTTP/".parse_next(input)?;
let version = take_while(1.., is_version).parse_next(input)?;
Ok(version)
}
fn message_header_value<'s>(input: &mut Stream<'s>) -> PResult<&'s [u8]> {
let _ = take_while(1.., is_horizontal_space).parse_next(input)?;
let data = take_while(1.., not_line_ending).parse_next(input)?;
let _ = line_ending.parse_next(input)?;
Ok(data)
}
fn message_header<'s>(input: &mut Stream<'s>) -> PResult> {
let name = take_while(1.., is_token).parse_next(input)?;
let _ = ':'.parse_next(input)?;
let value = repeat(1.., message_header_value).parse_next(input)?;
Ok(Header { name, value })
}
#[rustfmt::skip]
#[allow(clippy::match_same_arms)]
#[allow(clippy::match_like_matches_macro)]
fn is_token(c: u8) -> bool {
match c {
128..=255 => false,
0..=31 => false,
b'(' => false,
b')' => false,
b'<' => false,
b'>' => false,
b'@' => false,
b',' => false,
b';' => false,
b':' => false,
b'\\' => false,
b'"' => false,
b'/' => false,
b'[' => false,
b']' => false,
b'?' => false,
b'=' => false,
b'{' => false,
b'}' => false,
b' ' => false,
_ => true,
}
}
fn is_version(c: u8) -> bool {
(b'0'..=b'9').contains(&c) || c == b'.'
}
fn not_line_ending(c: u8) -> bool {
c != b'\r' && c != b'\n'
}
fn is_space(c: u8) -> bool {
c == b' '
}
fn is_not_space(c: u8) -> bool {
c != b' '
}
fn is_horizontal_space(c: u8) -> bool {
c == b' ' || c == b'\t'
}
winnow-0.5.15/examples/http/parser_streaming.rs 0000644 0000000 0000000 00000006407 10461020230 0017754 0 ustar 0000000 0000000 use winnow::{
ascii::line_ending, combinator::repeat, prelude::*, stream::Partial, token::take_while,
};
pub type Stream<'i> = Partial<&'i [u8]>;
#[rustfmt::skip]
#[derive(Debug)]
#[allow(dead_code)]
pub struct Request<'a> {
method: &'a [u8],
uri: &'a [u8],
version: &'a [u8],
}
#[derive(Debug)]
#[allow(dead_code)]
pub struct Header<'a> {
name: &'a [u8],
value: Vec<&'a [u8]>,
}
pub fn parse(data: &[u8]) -> Option, Vec>)>> {
let mut buf = Partial::new(data);
let mut v = Vec::new();
loop {
match request(&mut buf) {
Ok(r) => {
v.push(r);
if buf.is_empty() {
//println!("{}", i);
break;
}
}
Err(e) => {
println!("error: {:?}", e);
return None;
}
}
}
Some(v)
}
fn request<'s>(input: &mut Stream<'s>) -> PResult<(Request<'s>, Vec>)> {
let req = request_line(input)?;
let h = repeat(1.., message_header).parse_next(input)?;
let _ = line_ending.parse_next(input)?;
Ok((req, h))
}
fn request_line<'s>(input: &mut Stream<'s>) -> PResult> {
let method = take_while(1.., is_token).parse_next(input)?;
let _ = take_while(1.., is_space).parse_next(input)?;
let uri = take_while(1.., is_not_space).parse_next(input)?;
let _ = take_while(1.., is_space).parse_next(input)?;
let version = http_version(input)?;
let _ = line_ending.parse_next(input)?;
Ok(Request {
method,
uri,
version,
})
}
fn http_version<'s>(input: &mut Stream<'s>) -> PResult<&'s [u8]> {
let _ = "HTTP/".parse_next(input)?;
let version = take_while(1.., is_version).parse_next(input)?;
Ok(version)
}
fn message_header_value<'s>(input: &mut Stream<'s>) -> PResult<&'s [u8]> {
let _ = take_while(1.., is_horizontal_space).parse_next(input)?;
let data = take_while(1.., not_line_ending).parse_next(input)?;
let _ = line_ending.parse_next(input)?;
Ok(data)
}
fn message_header<'s>(input: &mut Stream<'s>) -> PResult> {
let name = take_while(1.., is_token).parse_next(input)?;
let _ = ':'.parse_next(input)?;
let value = repeat(1.., message_header_value).parse_next(input)?;
Ok(Header { name, value })
}
#[rustfmt::skip]
#[allow(clippy::match_same_arms)]
#[allow(clippy::match_like_matches_macro)]
fn is_token(c: u8) -> bool {
match c {
128..=255 => false,
0..=31 => false,
b'(' => false,
b')' => false,
b'<' => false,
b'>' => false,
b'@' => false,
b',' => false,
b';' => false,
b':' => false,
b'\\' => false,
b'"' => false,
b'/' => false,
b'[' => false,
b']' => false,
b'?' => false,
b'=' => false,
b'{' => false,
b'}' => false,
b' ' => false,
_ => true,
}
}
fn is_version(c: u8) -> bool {
(b'0'..=b'9').contains(&c) || c == b'.'
}
fn not_line_ending(c: u8) -> bool {
c != b'\r' && c != b'\n'
}
fn is_space(c: u8) -> bool {
c == b' '
}
fn is_not_space(c: u8) -> bool {
c != b' '
}
fn is_horizontal_space(c: u8) -> bool {
c == b' ' || c == b'\t'
}
winnow-0.5.15/examples/ini/bench.rs 0000644 0000000 0000000 00000003366 10461020230 0015267 0 ustar 0000000 0000000 use winnow::combinator::repeat;
use winnow::prelude::*;
mod parser;
mod parser_str;
fn bench_ini(c: &mut criterion::Criterion) {
let str = "[owner]
name=John Doe
organization=Acme Widgets Inc.
[database]
server=192.0.2.62
port=143
file=payroll.dat
\0";
let mut group = c.benchmark_group("ini");
group.throughput(criterion::Throughput::Bytes(str.len() as u64));
group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
b.iter(|| parser::categories.parse_peek(str.as_bytes()).unwrap());
});
group.bench_function(criterion::BenchmarkId::new("str", str.len()), |b| {
b.iter(|| parser_str::categories.parse_peek(str).unwrap())
});
}
fn bench_ini_keys_and_values(c: &mut criterion::Criterion) {
let str = "server=192.0.2.62
port=143
file=payroll.dat
\0";
fn acc<'s>(i: &mut parser::Stream<'s>) -> PResult> {
repeat(0.., parser::key_value).parse_next(i)
}
let mut group = c.benchmark_group("ini keys and values");
group.throughput(criterion::Throughput::Bytes(str.len() as u64));
group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
b.iter(|| acc.parse_peek(str.as_bytes()).unwrap());
});
}
fn bench_ini_key_value(c: &mut criterion::Criterion) {
let str = "server=192.0.2.62\n";
let mut group = c.benchmark_group("ini key value");
group.throughput(criterion::Throughput::Bytes(str.len() as u64));
group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
b.iter(|| parser::key_value.parse_peek(str.as_bytes()).unwrap());
});
}
criterion::criterion_group!(
benches,
bench_ini,
bench_ini_keys_and_values,
bench_ini_key_value
);
criterion::criterion_main!(benches);
winnow-0.5.15/examples/ini/main.rs 0000644 0000000 0000000 00000002471 10461020230 0015130 0 ustar 0000000 0000000 use winnow::prelude::*;
mod parser;
mod parser_str;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let input = args.input.as_deref().unwrap_or("1 + 1");
if args.binary {
match parser::categories.parse(input.as_bytes()) {
Ok(result) => {
println!(" {:?}", result);
}
Err(err) => {
println!(" {:?}", err);
}
}
} else {
match parser_str::categories.parse(input) {
Ok(result) => {
println!(" {:?}", result);
}
Err(err) => {
println!(" {}", err);
}
}
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
binary: bool,
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Long("binary") => {
res.binary = true;
}
Value(input) => {
res.input = Some(input.string()?);
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
winnow-0.5.15/examples/ini/parser.rs 0000644 0000000 0000000 00000007613 10461020230 0015503 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::str;
use winnow::prelude::*;
use winnow::{
ascii::{alphanumeric1 as alphanumeric, multispace0 as multispace, space0 as space},
combinator::opt,
combinator::repeat,
combinator::{delimited, separated_pair, terminated},
token::take_while,
};
pub type Stream<'i> = &'i [u8];
pub fn categories<'s>(i: &mut Stream<'s>) -> PResult>> {
repeat(
0..,
separated_pair(
category,
opt(multispace),
repeat(0.., terminated(key_value, opt(multispace))),
),
)
.parse_next(i)
}
fn category<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
delimited('[', take_while(0.., |c| c != b']'), ']')
.try_map(str::from_utf8)
.parse_next(i)
}
pub fn key_value<'s>(i: &mut Stream<'s>) -> PResult<(&'s str, &'s str)> {
let key = alphanumeric.try_map(str::from_utf8).parse_next(i)?;
let _ = (opt(space), '=', opt(space)).parse_next(i)?;
let val = take_while(0.., |c| c != b'\n' && c != b';')
.try_map(str::from_utf8)
.parse_next(i)?;
let _ = opt((';', take_while(0.., |c| c != b'\n'))).parse_next(i)?;
Ok((key, val))
}
#[test]
fn parse_category_test() {
let ini_file = &b"[category]
parameter=value
key = value2"[..];
let ini_without_category = &b"\n\nparameter=value
key = value2"[..];
let res = category.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, o)) => println!("i: {:?} | o: {:?}", str::from_utf8(i), o),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_category, "category")));
}
#[test]
fn parse_key_value_test() {
let ini_file = &b"parameter=value
key = value2"[..];
let ini_without_key_value = &b"\nkey = value2"[..];
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_space_test() {
let ini_file = &b"parameter = value
key = value2"[..];
let ini_without_key_value = &b"\nkey = value2"[..];
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_comment_test() {
let ini_file = &b"parameter=value;abc
key = value2"[..];
let ini_without_key_value = &b"\nkey = value2"[..];
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_multiple_categories_test() {
let ini_file = &b"[abcd]
parameter=value;abc
key = value2
[category]
parameter3=value3
key4 = value4
"[..];
let ini_after_parser = &b""[..];
let res = categories.parse_peek(ini_file);
//println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {:?} | o: {:?}", str::from_utf8(i), o),
_ => println!("error"),
}
let mut expected_1: HashMap<&str, &str> = HashMap::new();
expected_1.insert("parameter", "value");
expected_1.insert("key", "value2");
let mut expected_2: HashMap<&str, &str> = HashMap::new();
expected_2.insert("parameter3", "value3");
expected_2.insert("key4", "value4");
let mut expected_h: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
expected_h.insert("abcd", expected_1);
expected_h.insert("category", expected_2);
assert_eq!(res, Ok((ini_after_parser, expected_h)));
}
winnow-0.5.15/examples/ini/parser_str.rs 0000644 0000000 0000000 00000012560 10461020230 0016370 0 ustar 0000000 0000000 use std::collections::HashMap;
use winnow::prelude::*;
use winnow::{
ascii::{alphanumeric1 as alphanumeric, space0 as space},
combinator::opt,
combinator::repeat,
combinator::{delimited, terminated},
token::{take_till0, take_while},
};
pub type Stream<'i> = &'i str;
pub fn categories<'s>(
input: &mut Stream<'s>,
) -> PResult>> {
repeat(0.., category_and_keys).parse_next(input)
}
fn category_and_keys<'s>(i: &mut Stream<'s>) -> PResult<(&'s str, HashMap<&'s str, &'s str>)> {
(category, keys_and_values).parse_next(i)
}
fn category<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
terminated(
delimited('[', take_while(0.., |c| c != ']'), ']'),
opt(take_while(1.., [' ', '\r', '\n'])),
)
.parse_next(i)
}
fn keys_and_values<'s>(input: &mut Stream<'s>) -> PResult> {
repeat(0.., key_value).parse_next(input)
}
fn key_value<'s>(i: &mut Stream<'s>) -> PResult<(&'s str, &'s str)> {
let key = alphanumeric.parse_next(i)?;
let _ = (opt(space), "=", opt(space)).parse_next(i)?;
let val = take_till0(is_line_ending_or_comment).parse_next(i)?;
let _ = opt(space).parse_next(i)?;
let _ = opt((";", not_line_ending)).parse_next(i)?;
let _ = opt(space_or_line_ending).parse_next(i)?;
Ok((key, val))
}
fn is_line_ending_or_comment(chr: char) -> bool {
chr == ';' || chr == '\n'
}
fn not_line_ending<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
take_while(0.., |c| c != '\r' && c != '\n').parse_next(i)
}
fn space_or_line_ending<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
take_while(1.., [' ', '\r', '\n']).parse_next(i)
}
#[test]
fn parse_category_test() {
let ini_file = "[category]
parameter=value
key = value2";
let ini_without_category = "parameter=value
key = value2";
let res = category.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_category, "category")));
}
#[test]
fn parse_key_value_test() {
let ini_file = "parameter=value
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_space_test() {
let ini_file = "parameter = value
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_comment_test() {
let ini_file = "parameter=value;abc
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_multiple_keys_and_values_test() {
let ini_file = "parameter=value;abc
key = value2
[category]";
let ini_without_key_value = "[category]";
let res = keys_and_values.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected: HashMap<&str, &str> = HashMap::new();
expected.insert("parameter", "value");
expected.insert("key", "value2");
assert_eq!(res, Ok((ini_without_key_value, expected)));
}
#[test]
fn parse_category_then_multiple_keys_and_values_test() {
//FIXME: there can be an empty line or a comment line after a category
let ini_file = "[abcd]
parameter=value;abc
key = value2
[category]";
let ini_after_parser = "[category]";
let res = category_and_keys.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected_h: HashMap<&str, &str> = HashMap::new();
expected_h.insert("parameter", "value");
expected_h.insert("key", "value2");
assert_eq!(res, Ok((ini_after_parser, ("abcd", expected_h))));
}
#[test]
fn parse_multiple_categories_test() {
let ini_file = "[abcd]
parameter=value;abc
key = value2
[category]
parameter3=value3
key4 = value4
";
let res = categories.parse_peek(ini_file);
//println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected_1: HashMap<&str, &str> = HashMap::new();
expected_1.insert("parameter", "value");
expected_1.insert("key", "value2");
let mut expected_2: HashMap<&str, &str> = HashMap::new();
expected_2.insert("parameter3", "value3");
expected_2.insert("key4", "value4");
let mut expected_h: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
expected_h.insert("abcd", expected_1);
expected_h.insert("category", expected_2);
assert_eq!(res, Ok(("", expected_h)));
}
winnow-0.5.15/examples/iterator.rs 0000644 0000000 0000000 00000004603 10461020230 0015255 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::iter::Iterator;
use winnow::ascii::alphanumeric1;
use winnow::combinator::iterator;
use winnow::combinator::{separated_pair, terminated};
use winnow::prelude::*;
fn main() {
let mut data = "abcabcabcabc";
fn parser<'s>(i: &mut &'s str) -> PResult<&'s str> {
"abc".parse_next(i)
}
// `from_fn` (available from Rust 1.34) can create an iterator
// from a closure
let it = std::iter::from_fn(move || {
match parser.parse_next(&mut data) {
// when successful, a parser returns a tuple of
// the remaining input and the output value.
// So we replace the captured input data with the
// remaining input, to be parsed on the next call
Ok(o) => Some(o),
_ => None,
}
});
for value in it {
println!("parser returned: {}", value);
}
println!("\n********************\n");
let mut data = "abcabcabcabc";
// if `from_fn` is not available, it is possible to fold
// over an iterator of functions
let res = std::iter::repeat(parser)
.take(3)
.try_fold(Vec::new(), |mut acc, mut parser| {
parser.parse_next(&mut data).map(|o| {
acc.push(o);
acc
})
});
// will print "parser iterator returned: Ok(("abc", ["abc", "abc", "abc"]))"
println!("\nparser iterator returned: {:?}", res);
println!("\n********************\n");
let data = "key1:value1,key2:value2,key3:value3,;";
// `winnow::combinator::iterator` will return an iterator
// producing the parsed values. Compared to the previous
// solutions:
// - we can work with a normal iterator like `from_fn`
// - we can get the remaining input afterwards, like with the `try_fold` trick
let mut winnow_it = iterator(
data,
terminated(separated_pair(alphanumeric1, ":", alphanumeric1), ","),
);
let res = winnow_it
.map(|(k, v)| (k.to_uppercase(), v))
.collect::>();
let parser_result: PResult<(_, _), ()> = winnow_it.finish();
let (remaining_input, ()) = parser_result.unwrap();
// will print "iterator returned {"key1": "value1", "key3": "value3", "key2": "value2"}, remaining input is ';'"
println!(
"iterator returned {:?}, remaining input is '{}'",
res, remaining_input
);
}
winnow-0.5.15/examples/json/bench.rs 0000644 0000000 0000000 00000004373 10461020230 0015460 0 ustar 0000000 0000000 use winnow::prelude::*;
use winnow::Partial;
mod json;
mod parser;
mod parser_dispatch;
mod parser_partial;
fn json_bench(c: &mut criterion::Criterion) {
let data = [("small", SMALL), ("canada", CANADA)];
let mut group = c.benchmark_group("json");
for (name, sample) in data {
let len = sample.len();
group.throughput(criterion::Throughput::Bytes(len as u64));
group.bench_with_input(criterion::BenchmarkId::new("basic", name), &len, |b, _| {
type Error<'i> = winnow::error::InputError>;
b.iter(|| parser::json::.parse_peek(sample).unwrap());
});
group.bench_with_input(criterion::BenchmarkId::new("unit", name), &len, |b, _| {
type Error<'i> = ();
b.iter(|| parser::json::.parse_peek(sample).unwrap());
});
group.bench_with_input(
criterion::BenchmarkId::new("context", name),
&len,
|b, _| {
type Error<'i> = winnow::error::ContextError>;
b.iter(|| parser::json::.parse_peek(sample).unwrap());
},
);
group.bench_with_input(
criterion::BenchmarkId::new("dispatch", name),
&len,
|b, _| {
type Error<'i> = winnow::error::InputError>;
b.iter(|| parser_dispatch::json::.parse_peek(sample).unwrap());
},
);
group.bench_with_input(
criterion::BenchmarkId::new("streaming", name),
&len,
|b, _| {
type Error<'i> = winnow::error::InputError>;
b.iter(|| {
parser_partial::json::
.parse_peek(Partial::new(sample))
.unwrap()
});
},
);
}
group.finish();
}
const SMALL: &str = " { \"a\"\t: 42,
\"b\": [ \"x\", \"y\", 12 ,\"\\u2014\", \"\\uD83D\\uDE10\"] ,
\"c\": { \"hello\" : \"world\"
}
} ";
const CANADA: &str = include_str!("../../third_party/nativejson-benchmark/data/canada.json");
criterion::criterion_group!(benches, json_bench,);
criterion::criterion_main!(benches);
winnow-0.5.15/examples/json/json.rs 0000644 0000000 0000000 00000000331 10461020230 0015340 0 ustar 0000000 0000000 use std::collections::HashMap;
#[derive(Debug, PartialEq, Clone)]
pub enum JsonValue {
Null,
Boolean(bool),
Str(String),
Num(f64),
Array(Vec),
Object(HashMap),
}
winnow-0.5.15/examples/json/main.rs 0000644 0000000 0000000 00000004364 10461020230 0015325 0 ustar 0000000 0000000 mod json;
mod parser;
mod parser_dispatch;
#[allow(dead_code)]
mod parser_partial;
use winnow::error::ErrorKind;
use winnow::prelude::*;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let data = args.input.as_deref().unwrap_or(if args.invalid {
" { \"a\"\t: 42,
\"b\": [ \"x\", \"y\", 12 ] ,
\"c\": { 1\"hello\" : \"world\"
}
} "
} else {
" { \"a\"\t: 42,
\"b\": [ \"x\", \"y\", 12 ] ,
\"c\": { \"hello\" : \"world\"
}
} "
});
let result = match args.implementation {
Impl::Naive => parser::json::.parse(data),
Impl::Dispatch => parser_dispatch::json::.parse(data),
};
match result {
Ok(json) => {
println!("{:#?}", json);
}
Err(err) => {
if args.pretty {
println!("{}", err);
} else {
println!("{:#?}", err);
}
}
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
invalid: bool,
pretty: bool,
implementation: Impl,
}
enum Impl {
Naive,
Dispatch,
}
impl Default for Impl {
fn default() -> Self {
Self::Naive
}
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Long("invalid") => {
res.invalid = true;
}
Long("pretty") => {
// Only case where pretty matters
res.pretty = true;
res.invalid = true;
}
Long("impl") => {
res.implementation = args.value()?.parse_with(|s| match s {
"naive" => Ok(Impl::Naive),
"dispatch" => Ok(Impl::Dispatch),
_ => Err("expected `naive`, `dispatch`"),
})?;
}
Value(input) => {
res.input = Some(input.string()?);
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
winnow-0.5.15/examples/json/parser.rs 0000644 0000000 0000000 00000025662 10461020230 0015701 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::str;
use winnow::prelude::*;
use winnow::{
ascii::float,
combinator::alt,
combinator::cut_err,
combinator::{delimited, preceded, separated_pair, terminated},
combinator::{fold_repeat, separated0},
error::{AddContext, ParserError},
token::{any, none_of, take, take_while},
};
use crate::json::JsonValue;
pub type Stream<'i> = &'i str;
/// The root element of a JSON parser is any value
///
/// A parser has the following signature:
/// `&mut Stream -> PResult`, with `PResult` defined as:
/// `type PResult = Result>;`
///
/// most of the times you can ignore the error type and use the default (but this
/// examples shows custom error types later on!)
///
/// Here we use `&str` as input type, but parsers can be generic over
/// the input type, work directly with `&[u8]`, or any other type that
/// implements the required traits.
pub fn json<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
delimited(ws, json_value, ws).parse_next(input)
}
/// `alt` is a combinator that tries multiple parsers one by one, until
/// one of them succeeds
fn json_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
// `alt` combines the each value parser. It returns the result of the first
// successful parser, or an error
alt((
null.value(JsonValue::Null),
boolean.map(JsonValue::Boolean),
string.map(JsonValue::Str),
float.map(JsonValue::Num),
array.map(JsonValue::Array),
object.map(JsonValue::Object),
))
.parse_next(input)
}
/// `tag(string)` generates a parser that recognizes the argument string.
///
/// This also shows returning a sub-slice of the original input
fn null<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// This is a parser that returns `"null"` if it sees the string "null", and
// an error otherwise
"null".parse_next(input)
}
/// We can combine `tag` with other functions, like `value` which returns a given constant value on
/// success.
fn boolean<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
// This is a parser that returns `true` if it sees the string "true", and
// an error otherwise
let parse_true = "true".value(true);
// This is a parser that returns `false` if it sees the string "false", and
// an error otherwise
let parse_false = "false".value(false);
alt((parse_true, parse_false)).parse_next(input)
}
/// This parser gathers all `char`s up into a `String`with a parse to recognize the double quote
/// character, before the string (using `preceded`) and after the string (using `terminated`).
fn string<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
preceded(
'\"',
// `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
// combinators like `alt` that they should not try other parsers. We were in the
// right branch (since we found the `"` character) but encountered an error when
// parsing the string
cut_err(terminated(
fold_repeat(0.., character, String::new, |mut string, c| {
string.push(c);
string
}),
'\"',
)),
)
// `context` lets you add a static string to errors to provide more information in the
// error chain (to indicate which parser had an error)
.context("string")
.parse_next(input)
}
/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
/// like escaping
fn character<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
let c = none_of('\"').parse_next(input)?;
if c == '\\' {
alt((
any.verify_map(|c| {
Some(match c {
'"' | '\\' | '/' => c,
'b' => '\x08',
'f' => '\x0C',
'n' => '\n',
'r' => '\r',
't' => '\t',
_ => return None,
})
}),
preceded('u', unicode_escape),
))
.parse_next(input)
} else {
Ok(c)
}
}
fn unicode_escape<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
alt((
// Not a surrogate
u16_hex
.verify(|cp| !(0xD800..0xE000).contains(cp))
.map(|cp| cp as u32),
// See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
separated_pair(u16_hex, "\\u", u16_hex)
.verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
.map(|(high, low)| {
let high_ten = (high as u32) - 0xD800;
let low_ten = (low as u32) - 0xDC00;
(high_ten << 10) + low_ten + 0x10000
}),
))
.verify_map(
// Could be probably replaced with .unwrap() or _unchecked due to the verify checks
std::char::from_u32,
)
.parse_next(input)
}
fn u16_hex<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
take(4usize)
.verify_map(|s| u16::from_str_radix(s, 16).ok())
.parse_next(input)
}
/// Some combinators, like `separated0` or `many0`, will call a parser repeatedly,
/// accumulating results in a `Vec`, until it encounters an error.
/// If you want more control on the parser application, check out the `iterator`
/// combinator (cf `examples/iterator.rs`)
fn array<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('[', ws),
cut_err(terminated(separated0(json_value, (ws, ',', ws)), (ws, ']'))),
)
.context("array")
.parse_next(input)
}
fn object<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('{', ws),
cut_err(terminated(separated0(key_value, (ws, ',', ws)), (ws, '}'))),
)
.context("object")
.parse_next(input)
}
fn key_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult<(String, JsonValue), E> {
separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
}
/// Parser combinators are constructed from the bottom up:
/// first we write parsers for the smallest elements (here a space character),
/// then we'll combine them in larger parsers
fn ws<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// Combinators like `take_while` return a function. That function is the
// parser,to which we can pass the input
take_while(0.., WS).parse_next(input)
}
const WS: &[char] = &[' ', '\t', '\r', '\n'];
#[cfg(test)]
mod test {
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
use super::*;
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
type Error<'i> = winnow::error::InputError<&'i str>;
#[test]
fn json_string() {
assert_eq!(
string::>.parse_peek("\"\""),
Ok(("", "".to_string()))
);
assert_eq!(
string::>.parse_peek("\"abc\""),
Ok(("", "abc".to_string()))
);
assert_eq!(
string::>
.parse_peek("\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""),
Ok(("", "abc\"\\/\x08\x0C\n\r\t\x01——def".to_string())),
);
assert_eq!(
string::>.parse_peek("\"\\uD83D\\uDE10\""),
Ok(("", "😐".to_string()))
);
assert!(string::>.parse_peek("\"").is_err());
assert!(string::>.parse_peek("\"abc").is_err());
assert!(string::>.parse_peek("\"\\\"").is_err());
assert!(string::>.parse_peek("\"\\u123\"").is_err());
assert!(string::>.parse_peek("\"\\uD800\"").is_err());
assert!(string::>
.parse_peek("\"\\uD800\\uD800\"")
.is_err());
assert!(string::>.parse_peek("\"\\uDC00\"").is_err());
}
#[test]
fn json_object() {
use JsonValue::{Num, Object, Str};
let input = r#"{"a":42,"b":"x"}"#;
let expected = Object(
vec![
("a".to_string(), Num(42.0)),
("b".to_string(), Str("x".to_string())),
]
.into_iter()
.collect(),
);
assert_eq!(json::>.parse_peek(input), Ok(("", expected)));
}
#[test]
fn json_array() {
use JsonValue::{Array, Num, Str};
let input = r#"[42,"x"]"#;
let expected = Array(vec![Num(42.0), Str("x".to_string())]);
assert_eq!(json::>.parse_peek(input), Ok(("", expected)));
}
#[test]
fn json_whitespace() {
use JsonValue::{Array, Boolean, Null, Num, Object, Str};
let input = r#"
{
"null" : null,
"true" :true ,
"false": false ,
"number" : 123e4 ,
"string" : " abc 123 " ,
"array" : [ false , 1 , "two" ] ,
"object" : { "a" : 1.0 , "b" : "c" } ,
"empty_array" : [ ] ,
"empty_object" : { }
}
"#;
assert_eq!(
json::>.parse_peek(input),
Ok((
"",
Object(
vec![
("null".to_string(), Null),
("true".to_string(), Boolean(true)),
("false".to_string(), Boolean(false)),
("number".to_string(), Num(123e4)),
("string".to_string(), Str(" abc 123 ".to_string())),
(
"array".to_string(),
Array(vec![Boolean(false), Num(1.0), Str("two".to_string())])
),
(
"object".to_string(),
Object(
vec![
("a".to_string(), Num(1.0)),
("b".to_string(), Str("c".to_string())),
]
.into_iter()
.collect()
)
),
("empty_array".to_string(), Array(vec![]),),
("empty_object".to_string(), Object(HashMap::new()),),
]
.into_iter()
.collect()
)
))
);
}
}
winnow-0.5.15/examples/json/parser_dispatch.rs 0000644 0000000 0000000 00000026444 10461020230 0017557 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::str;
use winnow::prelude::*;
use winnow::{
ascii::float,
combinator::cut_err,
combinator::fail,
combinator::peek,
combinator::success,
combinator::{alt, dispatch},
combinator::{delimited, preceded, separated_pair, terminated},
combinator::{fold_repeat, separated0},
error::{AddContext, ParserError},
token::{any, none_of, take, take_while},
};
use crate::json::JsonValue;
pub type Stream<'i> = &'i str;
/// The root element of a JSON parser is any value
///
/// A parser has the following signature:
/// `&mut Stream -> PResult`, with `PResult` defined as:
/// `type PResult = Result>;`
///
/// most of the times you can ignore the error type and use the default (but this
/// examples shows custom error types later on!)
///
/// Here we use `&str` as input type, but parsers can be generic over
/// the input type, work directly with `&[u8]`, or any other type that
/// implements the required traits.
pub fn json<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
delimited(ws, json_value, ws).parse_next(input)
}
/// `alt` is a combinator that tries multiple parsers one by one, until
/// one of them succeeds
fn json_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
// `dispatch` gives you `match`-like behavior compared to `alt` successively trying different
// implementations.
dispatch!(peek(any);
'n' => null.value(JsonValue::Null),
't' => true_.map(JsonValue::Boolean),
'f' => false_.map(JsonValue::Boolean),
'"' => string.map(JsonValue::Str),
'+' => float.map(JsonValue::Num),
'-' => float.map(JsonValue::Num),
'0'..='9' => float.map(JsonValue::Num),
'[' => array.map(JsonValue::Array),
'{' => object.map(JsonValue::Object),
_ => fail,
)
.parse_next(input)
}
/// `tag(string)` generates a parser that recognizes the argument string.
///
/// This also shows returning a sub-slice of the original input
fn null<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// This is a parser that returns `"null"` if it sees the string "null", and
// an error otherwise
"null".parse_next(input)
}
/// We can combine `tag` with other functions, like `value` which returns a given constant value on
/// success.
fn true_<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
// This is a parser that returns `true` if it sees the string "true", and
// an error otherwise
"true".value(true).parse_next(input)
}
/// We can combine `tag` with other functions, like `value` which returns a given constant value on
/// success.
fn false_<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
// This is a parser that returns `false` if it sees the string "false", and
// an error otherwise
"false".value(false).parse_next(input)
}
/// This parser gathers all `char`s up into a `String`with a parse to recognize the double quote
/// character, before the string (using `preceded`) and after the string (using `terminated`).
fn string<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
preceded(
'\"',
// `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
// combinators like `alt` that they should not try other parsers. We were in the
// right branch (since we found the `"` character) but encountered an error when
// parsing the string
cut_err(terminated(
fold_repeat(0.., character, String::new, |mut string, c| {
string.push(c);
string
}),
'\"',
)),
)
// `context` lets you add a static string to errors to provide more information in the
// error chain (to indicate which parser had an error)
.context("string")
.parse_next(input)
}
/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
/// like escaping
fn character<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
let c = none_of('\"').parse_next(input)?;
if c == '\\' {
dispatch!(any;
'"' => success('"'),
'\\' => success('\\'),
'/' => success('/'),
'b' => success('\x08'),
'f' => success('\x0C'),
'n' => success('\n'),
'r' => success('\r'),
't' => success('\t'),
'u' => unicode_escape,
_ => fail,
)
.parse_next(input)
} else {
Ok(c)
}
}
fn unicode_escape<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
alt((
// Not a surrogate
u16_hex
.verify(|cp| !(0xD800..0xE000).contains(cp))
.map(|cp| cp as u32),
// See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
separated_pair(u16_hex, "\\u", u16_hex)
.verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
.map(|(high, low)| {
let high_ten = (high as u32) - 0xD800;
let low_ten = (low as u32) - 0xDC00;
(high_ten << 10) + low_ten + 0x10000
}),
))
.verify_map(
// Could be probably replaced with .unwrap() or _unchecked due to the verify checks
std::char::from_u32,
)
.parse_next(input)
}
fn u16_hex<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
take(4usize)
.verify_map(|s| u16::from_str_radix(s, 16).ok())
.parse_next(input)
}
/// Some combinators, like `separated0` or `many0`, will call a parser repeatedly,
/// accumulating results in a `Vec`, until it encounters an error.
/// If you want more control on the parser application, check out the `iterator`
/// combinator (cf `examples/iterator.rs`)
fn array<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('[', ws),
cut_err(terminated(separated0(json_value, (ws, ',', ws)), (ws, ']'))),
)
.context("array")
.parse_next(input)
}
fn object<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('{', ws),
cut_err(terminated(separated0(key_value, (ws, ',', ws)), (ws, '}'))),
)
.context("object")
.parse_next(input)
}
fn key_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult<(String, JsonValue), E> {
separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
}
/// Parser combinators are constructed from the bottom up:
/// first we write parsers for the smallest elements (here a space character),
/// then we'll combine them in larger parsers
fn ws<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// Combinators like `take_while` return a function. That function is the
// parser,to which we can pass the input
take_while(0.., WS).parse_next(input)
}
const WS: &[char] = &[' ', '\t', '\r', '\n'];
#[cfg(test)]
mod test {
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
use super::*;
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
type Error<'i> = winnow::error::InputError<&'i str>;
#[test]
fn json_string() {
assert_eq!(
string::>.parse_peek("\"\""),
Ok(("", "".to_string()))
);
assert_eq!(
string::>.parse_peek("\"abc\""),
Ok(("", "abc".to_string()))
);
assert_eq!(
string::>
.parse_peek("\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""),
Ok(("", "abc\"\\/\x08\x0C\n\r\t\x01——def".to_string())),
);
assert_eq!(
string::>.parse_peek("\"\\uD83D\\uDE10\""),
Ok(("", "😐".to_string()))
);
assert!(string::>.parse_peek("\"").is_err());
assert!(string::>.parse_peek("\"abc").is_err());
assert!(string::>.parse_peek("\"\\\"").is_err());
assert!(string::>.parse_peek("\"\\u123\"").is_err());
assert!(string::>.parse_peek("\"\\uD800\"").is_err());
assert!(string::>
.parse_peek("\"\\uD800\\uD800\"")
.is_err());
assert!(string::>.parse_peek("\"\\uDC00\"").is_err());
}
#[test]
fn json_object() {
use JsonValue::{Num, Object, Str};
let input = r#"{"a":42,"b":"x"}"#;
let expected = Object(
vec![
("a".to_string(), Num(42.0)),
("b".to_string(), Str("x".to_string())),
]
.into_iter()
.collect(),
);
assert_eq!(json::>.parse_peek(input), Ok(("", expected)));
}
#[test]
fn json_array() {
use JsonValue::{Array, Num, Str};
let input = r#"[42,"x"]"#;
let expected = Array(vec![Num(42.0), Str("x".to_string())]);
assert_eq!(json::>.parse_peek(input), Ok(("", expected)));
}
#[test]
fn json_whitespace() {
use JsonValue::{Array, Boolean, Null, Num, Object, Str};
let input = r#"
{
"null" : null,
"true" :true ,
"false": false ,
"number" : 123e4 ,
"string" : " abc 123 " ,
"array" : [ false , 1 , "two" ] ,
"object" : { "a" : 1.0 , "b" : "c" } ,
"empty_array" : [ ] ,
"empty_object" : { }
}
"#;
assert_eq!(
json::>.parse_peek(input),
Ok((
"",
Object(
vec![
("null".to_string(), Null),
("true".to_string(), Boolean(true)),
("false".to_string(), Boolean(false)),
("number".to_string(), Num(123e4)),
("string".to_string(), Str(" abc 123 ".to_string())),
(
"array".to_string(),
Array(vec![Boolean(false), Num(1.0), Str("two".to_string())])
),
(
"object".to_string(),
Object(
vec![
("a".to_string(), Num(1.0)),
("b".to_string(), Str("c".to_string())),
]
.into_iter()
.collect()
)
),
("empty_array".to_string(), Array(vec![]),),
("empty_object".to_string(), Object(HashMap::new()),),
]
.into_iter()
.collect()
)
))
);
}
}
winnow-0.5.15/examples/json/parser_partial.rs 0000644 0000000 0000000 00000027310 10461020230 0017405 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::str;
use winnow::prelude::*;
use winnow::{
ascii::float,
combinator::alt,
combinator::{cut_err, rest},
combinator::{delimited, preceded, separated_pair, terminated},
combinator::{fold_repeat, separated0},
error::{AddContext, ParserError},
stream::Partial,
token::{any, none_of, take, take_while},
};
use crate::json::JsonValue;
pub type Stream<'i> = Partial<&'i str>;
/// The root element of a JSON parser is any value
///
/// A parser has the following signature:
/// `&mut Stream -> PResult`, with `PResult` defined as:
/// `type PResult = Result>;`
///
/// most of the times you can ignore the error type and use the default (but this
/// examples shows custom error types later on!)
///
/// Here we use `&str` as input type, but parsers can be generic over
/// the input type, work directly with `&[u8]`, or any other type that
/// implements the required traits.
pub fn json<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
delimited(ws, json_value, ws_or_eof).parse_next(input)
}
/// `alt` is a combinator that tries multiple parsers one by one, until
/// one of them succeeds
fn json_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
// `alt` combines the each value parser. It returns the result of the first
// successful parser, or an error
alt((
null.value(JsonValue::Null),
boolean.map(JsonValue::Boolean),
string.map(JsonValue::Str),
float.map(JsonValue::Num),
array.map(JsonValue::Array),
object.map(JsonValue::Object),
))
.parse_next(input)
}
/// `tag(string)` generates a parser that recognizes the argument string.
///
/// This also shows returning a sub-slice of the original input
fn null<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// This is a parser that returns `"null"` if it sees the string "null", and
// an error otherwise
"null".parse_next(input)
}
/// We can combine `tag` with other functions, like `value` which returns a given constant value on
/// success.
fn boolean<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
// This is a parser that returns `true` if it sees the string "true", and
// an error otherwise
let parse_true = "true".value(true);
// This is a parser that returns `false` if it sees the string "false", and
// an error otherwise
let parse_false = "false".value(false);
alt((parse_true, parse_false)).parse_next(input)
}
/// This parser gathers all `char`s up into a `String`with a parse to recognize the double quote
/// character, before the string (using `preceded`) and after the string (using `terminated`).
fn string<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
preceded(
'\"',
// `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
// combinators like `alt` that they should not try other parsers. We were in the
// right branch (since we found the `"` character) but encountered an error when
// parsing the string
cut_err(terminated(
fold_repeat(0.., character, String::new, |mut string, c| {
string.push(c);
string
}),
'\"',
)),
)
// `context` lets you add a static string to errors to provide more information in the
// error chain (to indicate which parser had an error)
.context("string")
.parse_next(input)
}
/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
/// like escaping
fn character<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
let c = none_of('\"').parse_next(input)?;
if c == '\\' {
alt((
any.verify_map(|c| {
Some(match c {
'"' | '\\' | '/' => c,
'b' => '\x08',
'f' => '\x0C',
'n' => '\n',
'r' => '\r',
't' => '\t',
_ => return None,
})
}),
preceded('u', unicode_escape),
))
.parse_next(input)
} else {
Ok(c)
}
}
fn unicode_escape<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
alt((
// Not a surrogate
u16_hex
.verify(|cp| !(0xD800..0xE000).contains(cp))
.map(|cp| cp as u32),
// See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
separated_pair(u16_hex, "\\u", u16_hex)
.verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
.map(|(high, low)| {
let high_ten = (high as u32) - 0xD800;
let low_ten = (low as u32) - 0xDC00;
(high_ten << 10) + low_ten + 0x10000
}),
))
.verify_map(
// Could be probably replaced with .unwrap() or _unchecked due to the verify checks
std::char::from_u32,
)
.parse_next(input)
}
fn u16_hex<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
take(4usize)
.verify_map(|s| u16::from_str_radix(s, 16).ok())
.parse_next(input)
}
/// Some combinators, like `separated0` or `many0`, will call a parser repeatedly,
/// accumulating results in a `Vec`, until it encounters an error.
/// If you want more control on the parser application, check out the `iterator`
/// combinator (cf `examples/iterator.rs`)
fn array<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('[', ws),
cut_err(terminated(separated0(json_value, (ws, ',', ws)), (ws, ']'))),
)
.context("array")
.parse_next(input)
}
fn object<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('{', ws),
cut_err(terminated(separated0(key_value, (ws, ',', ws)), (ws, '}'))),
)
.context("object")
.parse_next(input)
}
fn key_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult<(String, JsonValue), E> {
separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
}
/// Parser combinators are constructed from the bottom up:
/// first we write parsers for the smallest elements (here a space character),
/// then we'll combine them in larger parsers
fn ws<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// Combinators like `take_while` return a function. That function is the
// parser,to which we can pass the input
take_while(0.., WS).parse_next(input)
}
fn ws_or_eof<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
rest.verify(|s: &str| s.chars().all(|c| WS.contains(&c)))
.parse_next(input)
}
const WS: &[char] = &[' ', '\t', '\r', '\n'];
#[cfg(test)]
mod test {
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
use super::*;
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
type Error<'i> = winnow::error::InputError>;
#[test]
fn json_string() {
assert_eq!(
string::>.parse_peek(Partial::new("\"\"")),
Ok((Partial::new(""), "".to_string()))
);
assert_eq!(
string::>.parse_peek(Partial::new("\"abc\"")),
Ok((Partial::new(""), "abc".to_string()))
);
assert_eq!(
string::>.parse_peek(Partial::new(
"\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""
)),
Ok((
Partial::new(""),
"abc\"\\/\x08\x0C\n\r\t\x01——def".to_string()
)),
);
assert_eq!(
string::>.parse_peek(Partial::new("\"\\uD83D\\uDE10\"")),
Ok((Partial::new(""), "😐".to_string()))
);
assert!(string::>.parse_peek(Partial::new("\"")).is_err());
assert!(string::>
.parse_peek(Partial::new("\"abc"))
.is_err());
assert!(string::>
.parse_peek(Partial::new("\"\\\""))
.is_err());
assert!(string::>
.parse_peek(Partial::new("\"\\u123\""))
.is_err());
assert!(string::>
.parse_peek(Partial::new("\"\\uD800\""))
.is_err());
assert!(string::>
.parse_peek(Partial::new("\"\\uD800\\uD800\""))
.is_err());
assert!(string::>
.parse_peek(Partial::new("\"\\uDC00\""))
.is_err());
}
#[test]
fn json_object() {
use JsonValue::{Num, Object, Str};
let input = r#"{"a":42,"b":"x"}"#;
let expected = Object(
vec![
("a".to_string(), Num(42.0)),
("b".to_string(), Str("x".to_string())),
]
.into_iter()
.collect(),
);
assert_eq!(
json::>.parse_peek(Partial::new(input)),
Ok((Partial::new(""), expected))
);
}
#[test]
fn json_array() {
use JsonValue::{Array, Num, Str};
let input = r#"[42,"x"]"#;
let expected = Array(vec![Num(42.0), Str("x".to_string())]);
assert_eq!(
json::>.parse_peek(Partial::new(input)),
Ok((Partial::new(""), expected))
);
}
#[test]
fn json_whitespace() {
use JsonValue::{Array, Boolean, Null, Num, Object, Str};
let input = r#"
{
"null" : null,
"true" :true ,
"false": false ,
"number" : 123e4 ,
"string" : " abc 123 " ,
"array" : [ false , 1 , "two" ] ,
"object" : { "a" : 1.0 , "b" : "c" } ,
"empty_array" : [ ] ,
"empty_object" : { }
}
"#;
assert_eq!(
json::>.parse_peek(Partial::new(input)),
Ok((
Partial::new(""),
Object(
vec![
("null".to_string(), Null),
("true".to_string(), Boolean(true)),
("false".to_string(), Boolean(false)),
("number".to_string(), Num(123e4)),
("string".to_string(), Str(" abc 123 ".to_string())),
(
"array".to_string(),
Array(vec![Boolean(false), Num(1.0), Str("two".to_string())])
),
(
"object".to_string(),
Object(
vec![
("a".to_string(), Num(1.0)),
("b".to_string(), Str("c".to_string())),
]
.into_iter()
.collect()
)
),
("empty_array".to_string(), Array(vec![]),),
("empty_object".to_string(), Object(HashMap::new()),),
]
.into_iter()
.collect()
)
))
);
}
}
winnow-0.5.15/examples/json_iterator.rs 0000644 0000000 0000000 00000022405 10461020230 0016306 0 ustar 0000000 0000000 use std::collections::HashMap;
use winnow::prelude::*;
use winnow::{
ascii::{alphanumeric1 as alphanumeric, escaped, float},
combinator::alt,
combinator::cut_err,
combinator::separated0,
combinator::{preceded, separated_pair, terminated},
error::ParserError,
error::StrContext,
stream::Offset,
token::one_of,
token::{tag, take_while},
};
use std::cell::Cell;
use std::str;
#[derive(Clone, Debug)]
pub struct JsonValue<'a, 'b> {
input: &'a str,
pub offset: &'b Cell,
}
impl<'a, 'b: 'a> JsonValue<'a, 'b> {
pub fn new(input: &'a str, offset: &'b Cell) -> JsonValue<'a, 'b> {
JsonValue { input, offset }
}
pub fn offset(&self, input: &'a str) {
let offset = input.offset_from(&self.input);
self.offset.set(offset);
}
pub fn data(&self) -> &'a str {
&self.input[self.offset.get()..]
}
pub fn string(&self) -> Option<&'a str> {
println!("string()");
let mut data = self.data();
match string(&mut data) {
Ok(s) => {
self.offset(data);
println!("-> {}", s);
Some(s)
}
_ => None,
}
}
pub fn boolean(&self) -> Option {
println!("boolean()");
let mut data = self.data();
match boolean(&mut data) {
Ok(o) => {
self.offset(data);
println!("-> {}", o);
Some(o)
}
_ => None,
}
}
pub fn number(&self) -> Option {
println!("number()");
let mut data = self.data();
match float::<_, _, ()>.parse_next(&mut data) {
Ok(o) => {
self.offset(data);
println!("-> {}", o);
Some(o)
}
_ => None,
}
}
pub fn array(&self) -> Option>> {
println!("array()");
let mut data = self.data();
match tag::<_, _, ()>("[").parse_next(&mut data) {
Err(_) => None,
Ok(_) => {
println!("[");
self.offset(data);
let mut first = true;
let mut done = false;
let mut previous = std::usize::MAX;
let v = self.clone();
Some(std::iter::from_fn(move || {
if done {
return None;
}
// if we ignored one of the items, skip over the value
if v.offset.get() == previous {
println!("skipping value");
if value(&mut data).is_ok() {
v.offset(data);
}
}
if tag::<_, _, ()>("]").parse_next(&mut data).is_ok() {
println!("]");
v.offset(data);
done = true;
return None;
}
if first {
first = false;
} else {
match tag::<_, _, ()>(",").parse_next(&mut data) {
Ok(_) => {
println!(",");
v.offset(data);
}
Err(_) => {
done = true;
return None;
}
}
}
println!("-> {}", v.data());
previous = v.offset.get();
Some(v.clone())
}))
}
}
}
pub fn object(&self) -> Option)>> {
println!("object()");
let mut data = self.data();
match tag::<_, _, ()>("{").parse_next(&mut data) {
Err(_) => None,
Ok(_) => {
self.offset(data);
println!("{{");
let mut first = true;
let mut done = false;
let mut previous = std::usize::MAX;
let v = self.clone();
Some(std::iter::from_fn(move || {
if done {
return None;
}
// if we ignored one of the items, skip over the value
if v.offset.get() == previous {
println!("skipping value");
if value(&mut data).is_ok() {
v.offset(data);
}
}
if tag::<_, _, ()>("}").parse_next(&mut data).is_ok() {
println!("}}");
v.offset(data);
done = true;
return None;
}
if first {
first = false;
} else {
match tag::<_, _, ()>(",").parse_next(&mut data) {
Ok(_) => {
println!(",");
v.offset(data);
}
Err(_) => {
done = true;
return None;
}
}
}
match string(&mut data) {
Ok(key) => {
v.offset(data);
match tag::<_, _, ()>(":").parse_next(&mut data) {
Err(_) => None,
Ok(_) => {
v.offset(data);
previous = v.offset.get();
println!("-> {} => {}", key, v.data());
Some((key, v.clone()))
}
}
}
_ => None,
}
}))
}
}
}
}
fn sp<'a, E: ParserError<&'a str>>(i: &mut &'a str) -> PResult<&'a str, E> {
let chars = " \t\r\n";
take_while(0.., move |c| chars.contains(c)).parse_next(i)
}
fn parse_str<'a, E: ParserError<&'a str>>(i: &mut &'a str) -> PResult<&'a str, E> {
escaped(alphanumeric, '\\', one_of(['"', 'n', '\\'])).parse_next(i)
}
fn string<'s>(i: &mut &'s str) -> PResult<&'s str> {
preceded('\"', cut_err(terminated(parse_str, '\"')))
.context(StrContext::Label("string"))
.parse_next(i)
}
fn boolean(input: &mut &str) -> PResult {
alt(("false".map(|_| false), "true".map(|_| true))).parse_next(input)
}
fn array(i: &mut &str) -> PResult<()> {
preceded(
'[',
cut_err(terminated(
separated0(value, preceded(sp, ',')),
preceded(sp, ']'),
)),
)
.context(StrContext::Label("array"))
.parse_next(i)
}
fn key_value<'s>(i: &mut &'s str) -> PResult<(&'s str, ())> {
separated_pair(preceded(sp, string), cut_err(preceded(sp, ':')), value).parse_next(i)
}
fn hash(i: &mut &str) -> PResult<()> {
preceded(
'{',
cut_err(terminated(
separated0(key_value, preceded(sp, ',')),
preceded(sp, '}'),
)),
)
.context(StrContext::Label("map"))
.parse_next(i)
}
fn value(i: &mut &str) -> PResult<()> {
preceded(
sp,
alt((
hash,
array,
string.map(|_| ()),
float::<_, f64, _>.map(|_| ()),
boolean.map(|_| ()),
)),
)
.parse_next(i)
}
/// object(input) -> iterator over (key, `JsonValue`)
/// array(input) -> iterator over `JsonValue`
///
/// JsonValue.string -> iterator over String (returns None after first successful call)
///
/// object(input).filter(|(k, _)| k == "users").flatten(|(_, v)| v.object()).filter(|(k, _)| k == "city").flatten(|(_,v)| v.string())
fn main() {
/*let data = "{
\"users\": {
\"user1\" : { \"city\": \"Nantes\", \"country\": \"France\" },
\"user2\" : { \"city\": \"Bruxelles\", \"country\": \"Belgium\" },
\"user3\": { \"city\": \"Paris\", \"country\": \"France\", \"age\": 30 }
},
\"countries\": [\"France\", \"Belgium\"]
}";
*/
let data = "{\"users\":{\"user1\":{\"city\":\"Nantes\",\"country\":\"France\"},\"user2\":{\"city\":\"Bruxelles\",\"country\":\"Belgium\"},\"user3\":{\"city\":\"Paris\",\"country\":\"France\",\"age\":30}},\"countries\":[\"France\",\"Belgium\"]}";
let offset = Cell::new(0);
{
let parser = JsonValue::new(data, &offset);
if let Some(o) = parser.object() {
let s: HashMap<&str, &str> = o
.filter(|(k, _)| *k == "users")
.filter_map(|(_, v)| v.object())
.flatten()
.filter_map(|(user, v)| v.object().map(|o| (user, o)))
.flat_map(|(user, o)| {
o.filter(|(k, _)| *k == "city")
.filter_map(move |(_, v)| v.string().map(|s| (user, s)))
})
.collect();
println!("res = {:?}", s);
}
};
}
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winnow-0.5.15/examples/ndjson/main.rs 0000644 0000000 0000000 00000007640 10461020230 0015647 0 ustar 0000000 0000000 mod parser;
use std::io::Read;
use winnow::error::ErrMode;
use winnow::error::InputError;
use winnow::error::Needed;
use winnow::prelude::*;
use winnow::stream::Offset;
fn main() -> Result<(), lexopt::Error> {
let args = Args::parse()?;
let input = args.input.ok_or_else(|| lexopt::Error::MissingValue {
option: Some("".to_owned()),
})?;
let mut file = std::fs::File::open(&input).map_err(to_lexopt)?;
// Intentionally starting with a small buffer to make it easier to show `Incomplete` handling
let buffer_size = 10;
let min_buffer_growth = 100;
let buffer_growth_factor = 2;
let mut buffer = circular::Buffer::with_capacity(buffer_size);
loop {
let read = file.read(buffer.space()).map_err(to_lexopt)?;
eprintln!("read {}", read);
if read == 0 {
// Should be EOF since we always make sure there is `available_space`
assert_ne!(buffer.available_space(), 0);
assert_eq!(
buffer.available_data(),
0,
"leftover data: {}",
String::from_utf8_lossy(buffer.data())
);
break;
}
buffer.fill(read);
loop {
let input = parser::Stream::new(std::str::from_utf8(buffer.data()).map_err(to_lexopt)?);
match parser::ndjson::>.parse_peek(input) {
Ok((remainder, value)) => {
println!("{:?}", value);
println!();
// Tell the buffer how much we read
let consumed = remainder.offset_from(&input);
buffer.consume(consumed);
}
Err(ErrMode::Backtrack(e)) | Err(ErrMode::Cut(e)) => {
return Err(fmt_lexopt(e.to_string()));
}
Err(ErrMode::Incomplete(Needed::Size(size))) => {
// Without the format telling us how much space is required, we really should
// treat this the same as `Unknown` but are doing this to demonstrate how to
// handle `Size`.
//
// Even when the format has a header to tell us `Size`, we could hit incidental
// `Size(1)`s, so make sure we buffer more space than that to avoid reading
// one byte at a time
let head_room = size.get().max(min_buffer_growth);
let new_capacity = buffer.available_data() + head_room;
eprintln!("growing buffer to {}", new_capacity);
buffer.grow(new_capacity);
if buffer.available_space() < head_room {
eprintln!("buffer shift");
buffer.shift();
}
break;
}
Err(ErrMode::Incomplete(Needed::Unknown)) => {
let new_capacity = buffer_growth_factor * buffer.capacity();
eprintln!("growing buffer to {}", new_capacity);
buffer.grow(new_capacity);
break;
}
}
}
}
Ok(())
}
#[derive(Default)]
struct Args {
input: Option,
}
impl Args {
fn parse() -> Result {
use lexopt::prelude::*;
let mut res = Args::default();
let mut args = lexopt::Parser::from_env();
while let Some(arg) = args.next()? {
match arg {
Value(input) => {
res.input = Some(input.into());
}
_ => return Err(arg.unexpected()),
}
}
Ok(res)
}
}
fn to_lexopt(e: impl std::error::Error + Send + Sync + 'static) -> lexopt::Error {
lexopt::Error::Custom(Box::new(e))
}
fn fmt_lexopt(e: String) -> lexopt::Error {
lexopt::Error::Custom(e.into())
}
winnow-0.5.15/examples/ndjson/parser.rs 0000644 0000000 0000000 00000026605 10461020230 0016221 0 ustar 0000000 0000000 use std::collections::HashMap;
use std::str;
use winnow::prelude::*;
use winnow::{
ascii::float,
ascii::line_ending,
combinator::alt,
combinator::cut_err,
combinator::{delimited, preceded, separated_pair, terminated},
combinator::{fold_repeat, separated0},
error::{AddContext, ParserError},
stream::Partial,
token::{any, none_of, take, take_while},
};
#[derive(Debug, PartialEq, Clone)]
pub enum JsonValue {
Null,
Boolean(bool),
Str(String),
Num(f64),
Array(Vec),
Object(HashMap),
}
/// Use `Partial` to cause `ErrMode::Incomplete` while parsing
pub type Stream<'i> = Partial<&'i str>;
pub fn ndjson<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
alt((
terminated(delimited(ws, json_value, ws), line_ending).map(Some),
line_ending.value(None),
))
.parse_next(input)
}
// --Besides `WS`, same as a regular json parser ----------------------------
/// `alt` is a combinator that tries multiple parsers one by one, until
/// one of them succeeds
fn json_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
// `alt` combines the each value parser. It returns the result of the first
// successful parser, or an error
alt((
null.value(JsonValue::Null),
boolean.map(JsonValue::Boolean),
string.map(JsonValue::Str),
float.map(JsonValue::Num),
array.map(JsonValue::Array),
object.map(JsonValue::Object),
))
.parse_next(input)
}
/// `tag(string)` generates a parser that recognizes the argument string.
///
/// This also shows returning a sub-slice of the original input
fn null<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// This is a parser that returns `"null"` if it sees the string "null", and
// an error otherwise
"null".parse_next(input)
}
/// We can combine `tag` with other functions, like `value` which returns a given constant value on
/// success.
fn boolean<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
// This is a parser that returns `true` if it sees the string "true", and
// an error otherwise
let parse_true = "true".value(true);
// This is a parser that returns `false` if it sees the string "false", and
// an error otherwise
let parse_false = "false".value(false);
alt((parse_true, parse_false)).parse_next(input)
}
/// This parser gathers all `char`s up into a `String`with a parse to recognize the double quote
/// character, before the string (using `preceded`) and after the string (using `terminated`).
fn string<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult {
preceded(
'\"',
// `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
// combinators like `alt` that they should not try other parsers. We were in the
// right branch (since we found the `"` character) but encountered an error when
// parsing the string
cut_err(terminated(
fold_repeat(0.., character, String::new, |mut string, c| {
string.push(c);
string
}),
'\"',
)),
)
// `context` lets you add a static string to errors to provide more information in the
// error chain (to indicate which parser had an error)
.context("string")
.parse_next(input)
}
/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
/// like escaping
fn character<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
let c = none_of('"').parse_next(input)?;
if c == '\\' {
alt((
any.verify_map(|c| {
Some(match c {
'"' | '\\' | '/' => c,
'b' => '\x08',
'f' => '\x0C',
'n' => '\n',
'r' => '\r',
't' => '\t',
_ => return None,
})
}),
preceded('u', unicode_escape),
))
.parse_next(input)
} else {
Ok(c)
}
}
fn unicode_escape<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
alt((
// Not a surrogate
u16_hex
.verify(|cp| !(0xD800..0xE000).contains(cp))
.map(|cp| cp as u32),
// See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
separated_pair(u16_hex, "\\u", u16_hex)
.verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
.map(|(high, low)| {
let high_ten = (high as u32) - 0xD800;
let low_ten = (low as u32) - 0xDC00;
(high_ten << 10) + low_ten + 0x10000
}),
))
.verify_map(
// Could be probably replaced with .unwrap() or _unchecked due to the verify checks
std::char::from_u32,
)
.parse_next(input)
}
fn u16_hex<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult {
take(4usize)
.verify_map(|s| u16::from_str_radix(s, 16).ok())
.parse_next(input)
}
/// Some combinators, like `separated0` or `many0`, will call a parser repeatedly,
/// accumulating results in a `Vec`, until it encounters an error.
/// If you want more control on the parser application, check out the `iterator`
/// combinator (cf `examples/iterator.rs`)
fn array<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('[', ws),
cut_err(terminated(separated0(json_value, (ws, ',', ws)), (ws, ']'))),
)
.context("array")
.parse_next(input)
}
fn object<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult, E> {
preceded(
('{', ws),
cut_err(terminated(separated0(key_value, (ws, ',', ws)), (ws, '}'))),
)
.context("object")
.parse_next(input)
}
fn key_value<'i, E: ParserError> + AddContext, &'static str>>(
input: &mut Stream<'i>,
) -> PResult<(String, JsonValue), E> {
separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
}
/// Parser combinators are constructed from the bottom up:
/// first we write parsers for the smallest elements (here a space character),
/// then we'll combine them in larger parsers
fn ws<'i, E: ParserError>>(input: &mut Stream<'i>) -> PResult<&'i str, E> {
// Combinators like `take_while` return a function. That function is the
// parser,to which we can pass the input
take_while(0.., WS).parse_next(input)
}
const WS: &[char] = &[' ', '\t'];
#[cfg(test)]
mod test {
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
use super::*;
#[allow(clippy::useless_attribute)]
#[allow(dead_code)] // its dead for benches
type Error<'i> = winnow::error::InputError>;
#[test]
fn json_string() {
assert_eq!(
string::>.parse_peek(Partial::new("\"\"")),
Ok((Partial::new(""), "".to_string()))
);
assert_eq!(
string::>.parse_peek(Partial::new("\"abc\"")),
Ok((Partial::new(""), "abc".to_string()))
);
assert_eq!(
string::