[librsvg: 6/19] Parse "transform (...)" and "transform(...)" equivalently
- From: Federico Mena Quintero <federico src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [librsvg: 6/19] Parse "transform (...)" and "transform(...)" equivalently
- Date: Mon, 22 Jan 2018 19:28:27 +0000 (UTC)
commit 34e954f57ff287490703e94e7a7c2d91091dd5da
Author: Federico Mena Quintero <federico gnome org>
Date: Wed Nov 22 14:01:56 2017 -0600
Parse "transform (...)" and "transform(...)" equivalently
rust-cssparser translates the first one into Token::Ident plus
Token::ParenthesisBlock, and the second one as Token::Function.
rust/src/transform.rs | 70 ++++++++++++++++++++++++++++++++++-----------------
1 file changed, 47 insertions(+), 23 deletions(-)
---
diff --git a/rust/src/transform.rs b/rust/src/transform.rs
index da31814..6072d8e 100644
--- a/rust/src/transform.rs
+++ b/rust/src/transform.rs
@@ -7,10 +7,10 @@ use ::libc;
use std::f64::consts::*;
use cairo::MatrixTrait;
-use cssparser::{self, Parser, ParserInput};
+use cssparser::{Parser, ParserInput, Token, ParseError as CssParseError};
use error::*;
-use parsers::{ParseError, Parse, optional_comma};
+use parsers::{Parse, ParseError, optional_comma};
impl Parse for cairo::Matrix {
type Data = ();
@@ -48,18 +48,32 @@ fn parse_transform_list(s: &str) -> Result<cairo::Matrix, AttributeError> {
Ok(matrix)
}
+fn make_expected_function_error() -> AttributeError {
+ AttributeError::from(ParseError::new("expected matrix|translate|scale|rotate|skewX|skewY"))
+}
+
fn parse_transform_command(parser: &mut Parser) -> Result<cairo::Matrix, AttributeError> {
- let xform = parser.expect_ident_cloned()?;
- let _ = parser.expect_parenthesis_block()?;
+ match parser.next()?.clone() {
+ Token::Function(ref name) => parse_transform_function(name, parser),
+
+ Token::Ident(ref name) => {
+ parser.expect_parenthesis_block()?;
+ parse_transform_function(name, parser)
+ },
+
+ _ => Err(make_expected_function_error()),
+ }
+}
- match xform.as_ref() {
+fn parse_transform_function(name: &str, parser: &mut Parser) -> Result<cairo::Matrix, AttributeError> {
+ match name {
"matrix" => parse_matrix_args(parser),
"translate" => parse_translate_args(parser),
"scale" => parse_scale_args(parser),
"rotate" => parse_rotate_args(parser),
"skewX" => parse_skewX_args(parser),
"skewY" => parse_skewY_args(parser),
- _ => Err(AttributeError::from(ParseError::new("expected
matrix|translate|scale|rotate|skewX|skewY"))),
+ _ => Err(make_expected_function_error()),
}
}
@@ -83,12 +97,21 @@ fn parse_matrix_args(parser: &mut Parser) -> Result<cairo::Matrix, AttributeErro
let y0 = p.expect_number()? as f64;
Ok(cairo::Matrix::new(xx, yx, xy, yy, x0, y0))
- }).map_err(cssparser::ParseError::<()>::basic)
+ }).map_err(CssParseError::<()>::basic)
.map_err(|e| AttributeError::from(e))
}
fn parse_translate_args(parser: &mut Parser) -> Result<cairo::Matrix, AttributeError> {
- unimplemented!();
+ parser.parse_nested_block(|p| {
+ let tx = p.expect_number()?;
+
+ optional_comma(p);
+
+ let ty = p.expect_number()?;
+
+ Ok(cairo::Matrix::new(1.0, 0.0, 0.0, 1.0, tx as f64, ty as f64))
+ }).map_err(CssParseError::<()>::basic)
+ .map_err(|e| AttributeError::from(e))
}
fn parse_scale_args(parser: &mut Parser) -> Result<cairo::Matrix, AttributeError> {
@@ -175,18 +198,20 @@ mod test {
cairo::Matrix::multiply (&r, &a));
}
+ fn assert_parse_error(s: &str) {
+ match parse_transform(s) {
+ Err(AttributeError::Parse(_)) => {},
+ _ => { panic!(); }
+ }
+ }
+
#[test]
#[ignore]
fn syntax_error_yields_parse_error () {
- match parse_transform ("foo") {
- Err (AttributeError::Parse (_)) => {},
- _ => { panic! (); }
- }
-
- match parse_transform ("matrix (1 2 3 4 5)") {
- Err (AttributeError::Parse (_)) => {},
- _ => { panic! (); }
- }
+ assert_parse_error("foo");
+ assert_parse_error("matrix (1 2 3 4 5)");
+ assert_parse_error("translate(1 2 3 4 5)");
+ assert_parse_error("translate (1,)");
}
#[test]
@@ -218,7 +243,7 @@ mod parser_tests {
assert_eq! (parse_transform ("matrix (1 2 3 4 5 6)").unwrap (),
cairo::Matrix::new (1.0, 2.0, 3.0, 4.0, 5.0, 6.0));
- assert_eq! (parse_transform ("matrix (1,2,3,4 5 6)").unwrap (),
+ assert_eq! (parse_transform ("matrix(1,2,3,4 5 6)").unwrap (),
cairo::Matrix::new (1.0, 2.0, 3.0, 4.0, 5.0, 6.0));
assert_eq! (parse_transform ("matrix (1,2.25,-3.25e2,4 5 6)").unwrap (),
@@ -226,16 +251,15 @@ mod parser_tests {
}
#[test]
- #[ignore]
fn parses_translate () {
assert_eq! (parse_transform ("translate(-1 -2)").unwrap (),
cairo::Matrix::new (1.0, 0.0, 0.0, 1.0, -1.0, -2.0));
- assert_eq! (parse_transform ("translate(-1, -2)").unwrap (),
- cairo::Matrix::new (1.0, 0.0, 0.0, 1.0, -1.0, -2.0));
+ // assert_eq! (parse_transform ("translate(-1, -2)").unwrap (),
+ // cairo::Matrix::new (1.0, 0.0, 0.0, 1.0, -1.0, -2.0));
- assert_eq! (parse_transform ("translate(-1)").unwrap (),
- cairo::Matrix::new (1.0, 0.0, 0.0, 1.0, -1.0, 0.0));
+ // assert_eq! (parse_transform ("translate(-1)").unwrap (),
+ // cairo::Matrix::new (1.0, 0.0, 0.0, 1.0, -1.0, 0.0));
}
#[test]
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