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/* 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 http://mozilla.org/MPL/2.0/. */ | ||
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use cssparser::Parser; | ||
use parser::{Parse, ParserContext}; | ||
use std::fmt; | ||
use style_traits::ToCss; | ||
use values::NoViewportPercentage; | ||
use values::computed::ComputedValueAsSpecified; | ||
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// https://drafts.csswg.org/css-grid/#typedef-grid-row-start-grid-line | ||
#[derive(PartialEq, Clone, Debug)] | ||
#[cfg_attr(feature = "servo", derive(HeapSizeOf))] | ||
pub struct GridLine { | ||
pub is_span: bool, | ||
pub ident: Option<String>, | ||
pub integer: Option<i32>, | ||
} | ||
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impl Default for GridLine { | ||
fn default() -> Self { | ||
GridLine { | ||
is_span: false, | ||
ident: None, | ||
integer: None, | ||
} | ||
} | ||
} | ||
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impl ToCss for GridLine { | ||
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write { | ||
if !self.is_span && self.ident.is_none() && self.integer.is_none() { | ||
return dest.write_str("auto") | ||
} | ||
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if self.is_span { | ||
try!(dest.write_str("span")); | ||
} | ||
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if let Some(i) = self.integer { | ||
try!(write!(dest, " {}", i)); | ||
} | ||
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if let Some(ref s) = self.ident { | ||
try!(write!(dest, " {}", s)); | ||
} | ||
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Ok(()) | ||
} | ||
} | ||
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impl Parse for GridLine { | ||
fn parse(_context: &ParserContext, input: &mut Parser) -> Result<Self, ()> { | ||
let mut grid_line = Default::default(); | ||
if input.try(|i| i.expect_ident_matching("auto")).is_ok() { | ||
return Ok(grid_line) | ||
} | ||
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for _ in 0..3 { // Maximum possible entities for <grid-line> | ||
if input.try(|i| i.expect_ident_matching("span")).is_ok() { | ||
if grid_line.is_span { | ||
return Err(()) | ||
} | ||
grid_line.is_span = true; | ||
} else if let Ok(i) = input.try(|i| i.expect_integer()) { | ||
if i == 0 || grid_line.integer.is_some() { | ||
return Err(()) | ||
} | ||
grid_line.integer = Some(i); | ||
} else if let Ok(name) = input.try(|i| i.expect_ident()) { | ||
if grid_line.ident.is_some() { | ||
return Err(()) | ||
} | ||
grid_line.ident = Some(name.into_owned()); | ||
} else { | ||
break | ||
} | ||
} | ||
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if grid_line.is_span { | ||
if let Some(i) = grid_line.integer { | ||
if i < 0 { // disallow negative integers for grid spans | ||
return Err(()) | ||
} | ||
} else { | ||
grid_line.integer = Some(1); | ||
} | ||
} | ||
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Ok(grid_line) | ||
} | ||
} | ||
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impl ComputedValueAsSpecified for GridLine {} | ||
impl NoViewportPercentage for GridLine {} |
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