mirror of
https://github.com/servo/servo.git
synced 2025-08-06 06:00:15 +01:00
Lukas Lihotzki
GitHub
parent
f0ea3c6150
commit
251eeb2c2d
53 changed files with 1566 additions and 262 deletions
13
components/script/svgpath/mod.rs
Normal file
13
components/script/svgpath/mod.rs
Normal file
|
|
@ -0,0 +1,13 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
|
||||
|
||||
mod number;
|
||||
mod path;
|
||||
mod stream;
|
||||
|
||||
#[derive(Debug, Default, Eq, PartialEq)]
|
||||
pub struct Error;
|
||||
|
||||
pub(crate) use path::PathParser;
|
||||
pub(crate) use stream::Stream;
|
||||
198
components/script/svgpath/number.rs
Normal file
198
components/script/svgpath/number.rs
Normal file
|
|
@ -0,0 +1,198 @@
|
|||
// Copyright 2018 the SVG Types Authors
|
||||
// Copyright 2025 the Servo Authors
|
||||
// SPDX-License-Identifier: Apache-2.0 OR MIT
|
||||
|
||||
use std::str::FromStr;
|
||||
|
||||
use crate::svgpath::{Error, Stream};
|
||||
|
||||
/// An [SVG number](https://www.w3.org/TR/SVG2/types.html#InterfaceSVGNumber).
|
||||
#[derive(Clone, Copy, Debug, PartialEq)]
|
||||
pub struct Number(pub f32);
|
||||
|
||||
impl std::str::FromStr for Number {
|
||||
type Err = Error;
|
||||
|
||||
fn from_str(text: &str) -> Result<Self, Self::Err> {
|
||||
let mut s = Stream::from(text);
|
||||
let n = s.parse_number()?;
|
||||
s.skip_spaces();
|
||||
if !s.at_end() {
|
||||
return Err(Error);
|
||||
}
|
||||
|
||||
Ok(Self(n))
|
||||
}
|
||||
}
|
||||
|
||||
impl Stream<'_> {
|
||||
/// Parses number from the stream.
|
||||
///
|
||||
/// This method will detect a number length and then
|
||||
/// will pass a substring to the `f64::from_str` method.
|
||||
///
|
||||
/// <https://www.w3.org/TR/SVG2/types.html#InterfaceSVGNumber>
|
||||
pub fn parse_number(&mut self) -> Result<f32, Error> {
|
||||
// Strip off leading whitespaces.
|
||||
self.skip_spaces();
|
||||
|
||||
if self.at_end() {
|
||||
return Err(Error);
|
||||
}
|
||||
|
||||
self.parse_number_impl().map_err(|_| Error)
|
||||
}
|
||||
|
||||
fn parse_number_impl(&mut self) -> Result<f32, Error> {
|
||||
let start = self.pos();
|
||||
|
||||
let mut c = self.curr_byte()?;
|
||||
|
||||
// Consume sign.
|
||||
if matches!(c, b'+' | b'-') {
|
||||
self.advance(1);
|
||||
c = self.curr_byte()?;
|
||||
}
|
||||
|
||||
// Consume integer.
|
||||
match c {
|
||||
b'0'..=b'9' => self.skip_digits(),
|
||||
b'.' => {},
|
||||
_ => return Err(Error),
|
||||
}
|
||||
|
||||
// Consume fraction.
|
||||
if let Ok(b'.') = self.curr_byte() {
|
||||
self.advance(1);
|
||||
self.skip_digits();
|
||||
}
|
||||
|
||||
if let Ok(c) = self.curr_byte() {
|
||||
if matches!(c, b'e' | b'E') {
|
||||
let c2 = self.next_byte()?;
|
||||
// Check for `em`/`ex`.
|
||||
if c2 != b'm' && c2 != b'x' {
|
||||
self.advance(1);
|
||||
|
||||
match self.curr_byte()? {
|
||||
b'+' | b'-' => {
|
||||
self.advance(1);
|
||||
self.skip_digits();
|
||||
},
|
||||
b'0'..=b'9' => self.skip_digits(),
|
||||
_ => {
|
||||
return Err(Error);
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let s = self.slice_back(start);
|
||||
|
||||
// Use the default f32 parser now.
|
||||
if let Ok(n) = f32::from_str(s) {
|
||||
// inf, nan, etc. are an error.
|
||||
if n.is_finite() {
|
||||
return Ok(n);
|
||||
}
|
||||
}
|
||||
|
||||
Err(Error)
|
||||
}
|
||||
|
||||
/// Parses number from a list of numbers.
|
||||
pub fn parse_list_number(&mut self) -> Result<f32, Error> {
|
||||
if self.at_end() {
|
||||
return Err(Error);
|
||||
}
|
||||
|
||||
let n = self.parse_number()?;
|
||||
self.skip_spaces();
|
||||
self.parse_list_separator();
|
||||
Ok(n)
|
||||
}
|
||||
}
|
||||
|
||||
/// A pull-based [`<list-of-numbers>`] parser.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```
|
||||
/// use svgtypes::NumberListParser;
|
||||
///
|
||||
/// let mut p = NumberListParser::from("10, 20 -50");
|
||||
/// assert_eq!(p.next().unwrap().unwrap(), 10.0);
|
||||
/// assert_eq!(p.next().unwrap().unwrap(), 20.0);
|
||||
/// assert_eq!(p.next().unwrap().unwrap(), -50.0);
|
||||
/// assert_eq!(p.next().is_none(), true);
|
||||
/// ```
|
||||
///
|
||||
/// [`<list-of-numbers>`]: https://www.w3.org/TR/SVG2/types.html#InterfaceSVGNumberList
|
||||
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
|
||||
pub struct NumberListParser<'a>(Stream<'a>);
|
||||
|
||||
impl<'a> From<&'a str> for NumberListParser<'a> {
|
||||
#[inline]
|
||||
fn from(v: &'a str) -> Self {
|
||||
NumberListParser(Stream::from(v))
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for NumberListParser<'_> {
|
||||
type Item = Result<f32, Error>;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
if self.0.at_end() {
|
||||
None
|
||||
} else {
|
||||
let v = self.0.parse_list_number();
|
||||
if v.is_err() {
|
||||
self.0.jump_to_end();
|
||||
}
|
||||
|
||||
Some(v)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[rustfmt::skip]
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use crate::svgpath::Stream;
|
||||
|
||||
macro_rules! test_p {
|
||||
($name:ident, $text:expr, $result:expr) => (
|
||||
#[test]
|
||||
fn $name() {
|
||||
let mut s = Stream::from($text);
|
||||
assert_eq!(s.parse_number().unwrap(), $result);
|
||||
}
|
||||
)
|
||||
}
|
||||
|
||||
test_p!(parse_1, "0", 0.0);
|
||||
test_p!(parse_2, "1", 1.0);
|
||||
test_p!(parse_3, "-1", -1.0);
|
||||
test_p!(parse_4, " -1 ", -1.0);
|
||||
test_p!(parse_5, " 1 ", 1.0);
|
||||
test_p!(parse_6, ".4", 0.4);
|
||||
test_p!(parse_7, "-.4", -0.4);
|
||||
test_p!(parse_8, "-.4text", -0.4);
|
||||
test_p!(parse_9, "-.01 text", -0.01);
|
||||
test_p!(parse_10, "-.01 4", -0.01);
|
||||
test_p!(parse_11, ".0000000000008", 0.0000000000008);
|
||||
test_p!(parse_12, "1000000000000", 1000000000000.0);
|
||||
test_p!(parse_13, "123456.123456", 123456.123456);
|
||||
test_p!(parse_14, "+10", 10.0);
|
||||
test_p!(parse_15, "1e2", 100.0);
|
||||
test_p!(parse_16, "1e+2", 100.0);
|
||||
test_p!(parse_17, "1E2", 100.0);
|
||||
test_p!(parse_18, "1e-2", 0.01);
|
||||
test_p!(parse_19, "1ex", 1.0);
|
||||
test_p!(parse_20, "1em", 1.0);
|
||||
test_p!(parse_21, "12345678901234567890", 12345678901234567000.0);
|
||||
test_p!(parse_22, "0.", 0.0);
|
||||
test_p!(parse_23, "1.3e-2", 0.013);
|
||||
// test_number!(parse_24, "1e", 1.0); // TODO: this
|
||||
}
|
||||
393
components/script/svgpath/path.rs
Normal file
393
components/script/svgpath/path.rs
Normal file
|
|
@ -0,0 +1,393 @@
|
|||
// Copyright 2021 the SVG Types Authors
|
||||
// Copyright 2025 the Servo Authors
|
||||
// SPDX-License-Identifier: Apache-2.0 OR MIT
|
||||
|
||||
use canvas_traits::canvas::PathSegment;
|
||||
|
||||
use crate::svgpath::{Error, Stream};
|
||||
|
||||
pub struct PathParser<'a> {
|
||||
stream: Stream<'a>,
|
||||
state: State,
|
||||
last_cmd: u8,
|
||||
}
|
||||
|
||||
impl<'a> PathParser<'a> {
|
||||
pub fn new(string: &'a str) -> Self {
|
||||
Self {
|
||||
stream: Stream::from(string),
|
||||
state: State::default(),
|
||||
last_cmd: b' ',
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for PathParser<'_> {
|
||||
type Item = Result<PathSegment, Error>;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
self.stream.skip_spaces();
|
||||
|
||||
let Ok(curr_byte) = self.stream.curr_byte() else {
|
||||
return None;
|
||||
};
|
||||
|
||||
let cmd = if self.last_cmd == b' ' {
|
||||
if let move_to @ (b'm' | b'M') = curr_byte {
|
||||
self.stream.advance(1);
|
||||
move_to
|
||||
} else {
|
||||
return Some(Err(Error));
|
||||
}
|
||||
} else if curr_byte.is_ascii_alphabetic() {
|
||||
self.stream.advance(1);
|
||||
curr_byte
|
||||
} else {
|
||||
match self.last_cmd {
|
||||
b'm' => b'l',
|
||||
b'M' => b'L',
|
||||
b'z' | b'Z' => return Some(Err(Error)),
|
||||
cmd => cmd,
|
||||
}
|
||||
};
|
||||
|
||||
self.last_cmd = cmd;
|
||||
Some(to_point(&mut self.stream, cmd, &mut self.state))
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
pub struct State {
|
||||
start: (f32, f32),
|
||||
pos: (f32, f32),
|
||||
quad: (f32, f32),
|
||||
cubic: (f32, f32),
|
||||
}
|
||||
|
||||
pub fn to_point(s: &mut Stream<'_>, cmd: u8, state: &mut State) -> Result<PathSegment, Error> {
|
||||
let abs = cmd.is_ascii_uppercase();
|
||||
let cmd = cmd.to_ascii_lowercase();
|
||||
let (dx, dy) = if abs { (0., 0.) } else { state.pos };
|
||||
let seg = match cmd {
|
||||
b'm' => PathSegment::MoveTo {
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'l' => PathSegment::LineTo {
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'h' => PathSegment::LineTo {
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: state.pos.1,
|
||||
},
|
||||
b'v' => PathSegment::LineTo {
|
||||
x: state.pos.0,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'c' => PathSegment::Bezier {
|
||||
cp1x: s.parse_list_number()? + dx,
|
||||
cp1y: s.parse_list_number()? + dy,
|
||||
cp2x: s.parse_list_number()? + dx,
|
||||
cp2y: s.parse_list_number()? + dy,
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b's' => PathSegment::Bezier {
|
||||
cp1x: state.cubic.0,
|
||||
cp1y: state.cubic.1,
|
||||
cp2x: s.parse_list_number()? + dx,
|
||||
cp2y: s.parse_list_number()? + dy,
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'q' => PathSegment::Quadratic {
|
||||
cpx: s.parse_list_number()? + dx,
|
||||
cpy: s.parse_list_number()? + dy,
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b't' => PathSegment::Quadratic {
|
||||
cpx: state.quad.0,
|
||||
cpy: state.quad.1,
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'a' => PathSegment::SvgArc {
|
||||
radius_x: s.parse_list_number()?,
|
||||
radius_y: s.parse_list_number()?,
|
||||
rotation: s.parse_list_number()?,
|
||||
large_arc: s.parse_flag()?,
|
||||
sweep: s.parse_flag()?,
|
||||
x: s.parse_list_number()? + dx,
|
||||
y: s.parse_list_number()? + dy,
|
||||
},
|
||||
b'z' => PathSegment::ClosePath,
|
||||
_ => return Err(crate::svgpath::Error),
|
||||
};
|
||||
|
||||
match seg {
|
||||
PathSegment::MoveTo { x, y } => {
|
||||
state.start = (x, y);
|
||||
state.pos = (x, y);
|
||||
state.quad = (x, y);
|
||||
state.cubic = (x, y);
|
||||
},
|
||||
PathSegment::LineTo { x, y } | PathSegment::SvgArc { x, y, .. } => {
|
||||
state.pos = (x, y);
|
||||
state.quad = (x, y);
|
||||
state.cubic = (x, y);
|
||||
},
|
||||
PathSegment::Bezier {
|
||||
cp2x, cp2y, x, y, ..
|
||||
} => {
|
||||
state.pos = (x, y);
|
||||
state.quad = (x, y);
|
||||
state.cubic = (x * 2.0 - cp2x, y * 2.0 - cp2y);
|
||||
},
|
||||
PathSegment::Quadratic { cpx, cpy, x, y, .. } => {
|
||||
state.pos = (x, y);
|
||||
state.quad = (x * 2.0 - cpx, y * 2.0 - cpy);
|
||||
state.cubic = (x, y);
|
||||
},
|
||||
PathSegment::ClosePath => {
|
||||
state.pos = state.start;
|
||||
state.quad = state.start;
|
||||
state.cubic = state.start;
|
||||
},
|
||||
_ => {},
|
||||
}
|
||||
|
||||
Ok(seg)
|
||||
}
|
||||
|
||||
#[rustfmt::skip]
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
macro_rules! test {
|
||||
($name:ident, $text:expr, $( $seg:expr ),*) => (
|
||||
#[test]
|
||||
fn $name() {
|
||||
let mut s = PathParser::new($text);
|
||||
$(
|
||||
assert_eq!(s.next().unwrap().unwrap(), $seg);
|
||||
)*
|
||||
|
||||
if let Some(res) = s.next() {
|
||||
assert!(res.is_err());
|
||||
}
|
||||
}
|
||||
)
|
||||
}
|
||||
|
||||
test!(null, "", );
|
||||
test!(not_a_path, "q", );
|
||||
test!(not_a_move_to, "L 20 30", );
|
||||
test!(stop_on_err_1, "M 10 20 L 30 40 L 50",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 }
|
||||
);
|
||||
|
||||
test!(move_to_1, "M 10 20", PathSegment::MoveTo { x: 10.0, y: 20.0 });
|
||||
test!(move_to_2, "m 10 20", PathSegment::MoveTo { x: 10.0, y: 20.0 });
|
||||
test!(move_to_3, "M 10 20 30 40 50 60",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::LineTo { x: 50.0, y: 60.0 }
|
||||
);
|
||||
test!(move_to_4, "M 10 20 30 40 50 60 M 70 80 90 100 110 120",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::LineTo { x: 50.0, y: 60.0 },
|
||||
PathSegment::MoveTo { x: 70.0, y: 80.0 },
|
||||
PathSegment::LineTo { x: 90.0, y: 100.0 },
|
||||
PathSegment::LineTo { x: 110.0, y: 120.0 }
|
||||
);
|
||||
|
||||
test!(arc_to_1, "M 10 20 A 5 5 30 1 1 20 20",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::SvgArc {
|
||||
radius_x: 5.0, radius_y: 5.0,
|
||||
rotation: 30.0,
|
||||
large_arc: true, sweep: true,
|
||||
x: 20.0, y: 20.0
|
||||
}
|
||||
);
|
||||
|
||||
test!(arc_to_2, "M 10 20 a 5 5 30 0 0 20 20",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::SvgArc {
|
||||
radius_x: 5.0, radius_y: 5.0,
|
||||
rotation: 30.0,
|
||||
large_arc: false, sweep: false,
|
||||
x: 30.0, y: 40.0
|
||||
}
|
||||
);
|
||||
|
||||
test!(arc_to_10, "M10-20A5.5.3-4 010-.1",
|
||||
PathSegment::MoveTo { x: 10.0, y: -20.0 },
|
||||
PathSegment::SvgArc {
|
||||
radius_x: 5.5, radius_y: 0.3,
|
||||
rotation: -4.0,
|
||||
large_arc: false, sweep: true,
|
||||
x: 0.0, y: -0.1
|
||||
}
|
||||
);
|
||||
|
||||
test!(separator_1, "M 10 20 L 5 15 C 10 20 30 40 50 60",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 5.0, y: 15.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 10.0, cp1y: 20.0,
|
||||
cp2x: 30.0, cp2y: 40.0,
|
||||
x: 50.0, y: 60.0,
|
||||
}
|
||||
);
|
||||
|
||||
test!(separator_2, "M 10, 20 L 5, 15 C 10, 20 30, 40 50, 60",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 5.0, y: 15.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 10.0, cp1y: 20.0,
|
||||
cp2x: 30.0, cp2y: 40.0,
|
||||
x: 50.0, y: 60.0,
|
||||
}
|
||||
);
|
||||
|
||||
test!(separator_3, "M 10,20 L 5,15 C 10,20 30,40 50,60",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 5.0, y: 15.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 10.0, cp1y: 20.0,
|
||||
cp2x: 30.0, cp2y: 40.0,
|
||||
x: 50.0, y: 60.0,
|
||||
}
|
||||
);
|
||||
|
||||
test!(separator_4, "M10, 20 L5, 15 C10, 20 30 40 50 60",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 5.0, y: 15.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 10.0, cp1y: 20.0,
|
||||
cp2x: 30.0, cp2y: 40.0,
|
||||
x: 50.0, y: 60.0,
|
||||
}
|
||||
);
|
||||
|
||||
test!(separator_5, "M10 20V30H40V50H60Z",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 10.0, y: 30.0 },
|
||||
PathSegment::LineTo { x: 40.0, y: 30.0 },
|
||||
PathSegment::LineTo { x: 40.0, y: 50.0 },
|
||||
PathSegment::LineTo { x: 60.0, y: 50.0 },
|
||||
PathSegment::ClosePath
|
||||
);
|
||||
|
||||
test!(all_segments_1, "M 10 20 L 30 40 H 50 V 60 C 70 80 90 100 110 120 S 130 140 150 160
|
||||
Q 170 180 190 200 T 210 220 A 50 50 30 1 1 230 240 Z",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::LineTo { x: 50.0, y: 40.0 },
|
||||
PathSegment::LineTo { x: 50.0, y: 60.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 70.0, cp1y: 80.0,
|
||||
cp2x: 90.0, cp2y: 100.0,
|
||||
x: 110.0, y: 120.0,
|
||||
},
|
||||
PathSegment::Bezier {
|
||||
cp1x: 130.0, cp1y: 140.0,
|
||||
cp2x: 130.0, cp2y: 140.0,
|
||||
x: 150.0, y: 160.0,
|
||||
},
|
||||
PathSegment::Quadratic {
|
||||
cpx: 170.0, cpy: 180.0,
|
||||
x: 190.0, y: 200.0,
|
||||
},
|
||||
PathSegment::Quadratic {
|
||||
cpx: 210.0, cpy: 220.0,
|
||||
x: 210.0, y: 220.0,
|
||||
},
|
||||
PathSegment::SvgArc {
|
||||
radius_x: 50.0, radius_y: 50.0,
|
||||
rotation: 30.0,
|
||||
large_arc: true, sweep: true,
|
||||
x: 230.0, y: 240.0
|
||||
},
|
||||
PathSegment::ClosePath
|
||||
);
|
||||
|
||||
test!(all_segments_2, "m 10 20 l 30 40 h 50 v 60 c 70 80 90 100 110 120 s 130 140 150 160
|
||||
q 170 180 190 200 t 210 220 a 50 50 30 1 1 230 240 z",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 40.0, y: 60.0 },
|
||||
PathSegment::LineTo { x: 90.0, y: 60.0 },
|
||||
PathSegment::LineTo { x: 90.0, y: 120.0 },
|
||||
PathSegment::Bezier {
|
||||
cp1x: 160.0, cp1y: 200.0,
|
||||
cp2x: 180.0, cp2y: 220.0,
|
||||
x: 200.0, y: 240.0,
|
||||
},
|
||||
PathSegment::Bezier {
|
||||
cp1x: 220.0, cp1y: 260.0, //?
|
||||
cp2x: 330.0, cp2y: 380.0,
|
||||
x: 350.0, y: 400.0,
|
||||
},
|
||||
PathSegment::Quadratic {
|
||||
cpx: 520.0, cpy: 580.0,
|
||||
x: 540.0, y: 600.0,
|
||||
},
|
||||
PathSegment::Quadratic {
|
||||
cpx: 560.0, cpy: 620.0, //?
|
||||
x: 750.0, y: 820.0
|
||||
},
|
||||
PathSegment::SvgArc {
|
||||
radius_x: 50.0, radius_y: 50.0,
|
||||
rotation: 30.0,
|
||||
large_arc: true, sweep: true,
|
||||
x: 980.0, y: 1060.0
|
||||
},
|
||||
PathSegment::ClosePath
|
||||
);
|
||||
|
||||
test!(close_path_1, "M10 20 L 30 40 ZM 100 200 L 300 400",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::ClosePath,
|
||||
PathSegment::MoveTo { x: 100.0, y: 200.0 },
|
||||
PathSegment::LineTo { x: 300.0, y: 400.0 }
|
||||
);
|
||||
|
||||
test!(close_path_2, "M10 20 L 30 40 zM 100 200 L 300 400",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::ClosePath,
|
||||
PathSegment::MoveTo { x: 100.0, y: 200.0 },
|
||||
PathSegment::LineTo { x: 300.0, y: 400.0 }
|
||||
);
|
||||
|
||||
test!(close_path_3, "M10 20 L 30 40 Z Z Z",
|
||||
PathSegment::MoveTo { x: 10.0, y: 20.0 },
|
||||
PathSegment::LineTo { x: 30.0, y: 40.0 },
|
||||
PathSegment::ClosePath,
|
||||
PathSegment::ClosePath,
|
||||
PathSegment::ClosePath
|
||||
);
|
||||
|
||||
// first token should be EndOfStream
|
||||
test!(invalid_1, "M\t.", );
|
||||
|
||||
// ClosePath can't be followed by a number
|
||||
test!(invalid_2, "M 0 0 Z 2",
|
||||
PathSegment::MoveTo { x: 0.0, y: 0.0 },
|
||||
PathSegment::ClosePath
|
||||
);
|
||||
|
||||
// ClosePath can be followed by any command
|
||||
test!(invalid_3, "M 0 0 Z H 10",
|
||||
PathSegment::MoveTo { x: 0.0, y: 0.0 },
|
||||
PathSegment::ClosePath,
|
||||
PathSegment::LineTo { x: 10.0, y: 0.0 }
|
||||
);
|
||||
}
|
||||
162
components/script/svgpath/stream.rs
Normal file
162
components/script/svgpath/stream.rs
Normal file
|
|
@ -0,0 +1,162 @@
|
|||
// Copyright 2018 the SVG Types Authors
|
||||
// Copyright 2025 the Servo Authors
|
||||
// SPDX-License-Identifier: Apache-2.0 OR MIT
|
||||
|
||||
use crate::svgpath::Error;
|
||||
|
||||
/// A streaming text parsing interface.
|
||||
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
|
||||
pub struct Stream<'a> {
|
||||
text: &'a str,
|
||||
pos: usize,
|
||||
}
|
||||
|
||||
impl<'a> From<&'a str> for Stream<'a> {
|
||||
#[inline]
|
||||
fn from(text: &'a str) -> Self {
|
||||
Stream { text, pos: 0 }
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Stream<'a> {
|
||||
/// Returns the current position in bytes.
|
||||
#[inline]
|
||||
pub fn pos(&self) -> usize {
|
||||
self.pos
|
||||
}
|
||||
|
||||
/// Sets current position equal to the end.
|
||||
///
|
||||
/// Used to indicate end of parsing on error.
|
||||
#[inline]
|
||||
pub fn jump_to_end(&mut self) {
|
||||
self.pos = self.text.len();
|
||||
}
|
||||
|
||||
/// Checks if the stream is reached the end.
|
||||
///
|
||||
/// Any [`pos()`] value larger than original text length indicates stream end.
|
||||
///
|
||||
/// Accessing stream after reaching end via safe methods will produce
|
||||
/// an error.
|
||||
///
|
||||
/// Accessing stream after reaching end via *_unchecked methods will produce
|
||||
/// a Rust's bound checking error.
|
||||
///
|
||||
/// [`pos()`]: #method.pos
|
||||
#[inline]
|
||||
pub fn at_end(&self) -> bool {
|
||||
self.pos >= self.text.len()
|
||||
}
|
||||
|
||||
/// Returns a byte from a current stream position.
|
||||
#[inline]
|
||||
pub fn curr_byte(&self) -> Result<u8, Error> {
|
||||
if self.at_end() {
|
||||
return Err(Error);
|
||||
}
|
||||
|
||||
Ok(self.curr_byte_unchecked())
|
||||
}
|
||||
|
||||
/// Returns a byte from a current stream position.
|
||||
///
|
||||
/// # Panics
|
||||
///
|
||||
/// - if the current position is after the end of the data
|
||||
#[inline]
|
||||
pub fn curr_byte_unchecked(&self) -> u8 {
|
||||
self.text.as_bytes()[self.pos]
|
||||
}
|
||||
|
||||
/// Checks that current byte is equal to provided.
|
||||
///
|
||||
/// Returns `false` if no bytes left.
|
||||
#[inline]
|
||||
pub fn is_curr_byte_eq(&self, c: u8) -> bool {
|
||||
if !self.at_end() {
|
||||
self.curr_byte_unchecked() == c
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns a next byte from a current stream position.
|
||||
#[inline]
|
||||
pub fn next_byte(&self) -> Result<u8, Error> {
|
||||
if self.pos + 1 >= self.text.len() {
|
||||
return Err(Error);
|
||||
}
|
||||
|
||||
Ok(self.text.as_bytes()[self.pos + 1])
|
||||
}
|
||||
|
||||
/// Advances by `n` bytes.
|
||||
#[inline]
|
||||
pub fn advance(&mut self, n: usize) {
|
||||
debug_assert!(self.pos + n <= self.text.len());
|
||||
self.pos += n;
|
||||
}
|
||||
|
||||
/// Skips whitespaces.
|
||||
///
|
||||
/// Accepted values: `' ' \n \r \t`.
|
||||
pub fn skip_spaces(&mut self) {
|
||||
while !self.at_end() && matches!(self.curr_byte_unchecked(), b' ' | b'\t' | b'\n' | b'\r') {
|
||||
self.advance(1);
|
||||
}
|
||||
}
|
||||
|
||||
/// Consumes bytes by the predicate.
|
||||
pub fn skip_bytes<F>(&mut self, f: F)
|
||||
where
|
||||
F: Fn(&Stream<'_>, u8) -> bool,
|
||||
{
|
||||
while !self.at_end() {
|
||||
let c = self.curr_byte_unchecked();
|
||||
if f(self, c) {
|
||||
self.advance(1);
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Slices data from `pos` to the current position.
|
||||
#[inline]
|
||||
pub fn slice_back(&self, pos: usize) -> &'a str {
|
||||
&self.text[pos..self.pos]
|
||||
}
|
||||
|
||||
/// Skips digits.
|
||||
pub fn skip_digits(&mut self) {
|
||||
self.skip_bytes(|_, c| c.is_ascii_digit());
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub(crate) fn parse_list_separator(&mut self) {
|
||||
if self.is_curr_byte_eq(b',') {
|
||||
self.advance(1);
|
||||
}
|
||||
}
|
||||
|
||||
// By the SVG spec 'large-arc' and 'sweep' must contain only one char
|
||||
// and can be written without any separators, e.g.: 10 20 30 01 10 20.
|
||||
pub(crate) fn parse_flag(&mut self) -> Result<bool, Error> {
|
||||
self.skip_spaces();
|
||||
|
||||
let c = self.curr_byte()?;
|
||||
match c {
|
||||
b'0' | b'1' => {
|
||||
self.advance(1);
|
||||
if self.is_curr_byte_eq(b',') {
|
||||
self.advance(1);
|
||||
}
|
||||
self.skip_spaces();
|
||||
|
||||
Ok(c == b'1')
|
||||
},
|
||||
_ => Err(Error),
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue