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lib.rs
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//! Lightning CSS is a CSS parser, transformer, and minifier based on the
//! [cssparser](https://github.com/servo/rust-cssparser) crate used in Firefox.
//! It supports fully parsing all CSS rules, properties, and values into normalized
//! structures exactly how a browser would. Once parsed, the CSS can be transformed
//! to add or remove vendor prefixes, or lower syntax for older browsers as appropriate.
//! The style sheet can also be minified to merge longhand properties into shorthands,
//! merge adjacent rules, reduce `calc()` expressions, and more. Finally, the style sheet
//! can be printed back to CSS syntax, either minified to remove whitespace and compress
//! the output as much as possible, or pretty printed.
//!
//! The [StyleSheet](stylesheet::StyleSheet) struct is the main entrypoint for Lightning CSS,
//! and supports parsing and transforming entire CSS files. You can also parse and manipulate
//! individual CSS [rules](rules), [properties](properties), or [values](values). The [bundler](bundler)
//! module also can be used to combine a CSS file and all of its dependencies together into a single
//! style sheet. See the individual module documentation for more details and examples.
#![deny(missing_docs)]
#![cfg_attr(docsrs, feature(doc_cfg))]
#[cfg(feature = "bundler")]
#[cfg_attr(docsrs, doc(cfg(feature = "bundler")))]
pub mod bundler;
mod compat;
mod context;
pub mod css_modules;
pub mod declaration;
pub mod dependencies;
pub mod error;
mod logical;
mod macros;
pub mod media_query;
mod parser;
mod prefixes;
pub mod printer;
pub mod properties;
pub mod rules;
pub mod selector;
pub mod stylesheet;
pub mod targets;
pub mod traits;
pub mod values;
pub mod vendor_prefix;
#[cfg(feature = "visitor")]
#[cfg_attr(docsrs, doc(cfg(feature = "visitor")))]
pub mod visitor;
#[cfg(feature = "serde")]
mod serialization;
#[cfg(test)]
mod tests {
use crate::css_modules::{CssModuleExport, CssModuleExports, CssModuleReference, CssModuleReferences};
use crate::dependencies::Dependency;
use crate::error::{Error, ErrorLocation, MinifyErrorKind, ParserError, PrinterErrorKind, SelectorError};
use crate::parser::ParserFlags;
use crate::properties::custom::Token;
use crate::properties::Property;
use crate::rules::CssRule;
use crate::rules::Location;
use crate::stylesheet::*;
use crate::targets::{Browsers, Features, Targets};
use crate::traits::{Parse, ToCss};
use crate::values::color::CssColor;
use crate::vendor_prefix::VendorPrefix;
use cssparser::SourceLocation;
use indoc::indoc;
use pretty_assertions::assert_eq;
use std::collections::HashMap;
fn test(source: &str, expected: &str) {
test_with_options(source, expected, ParserOptions::default())
}
fn test_with_options<'i, 'o>(source: &'i str, expected: &'i str, options: ParserOptions<'o, 'i>) {
let mut stylesheet = StyleSheet::parse(&source, options).unwrap();
stylesheet.minify(MinifyOptions::default()).unwrap();
let res = stylesheet.to_css(PrinterOptions::default()).unwrap();
assert_eq!(res.code, expected);
}
fn minify_test(source: &str, expected: &str) {
minify_test_with_options(source, expected, ParserOptions::default())
}
#[track_caller]
fn minify_test_with_options<'i, 'o>(source: &'i str, expected: &'i str, options: ParserOptions<'o, 'i>) {
let mut stylesheet = StyleSheet::parse(&source, options.clone()).unwrap();
stylesheet.minify(MinifyOptions::default()).unwrap();
let res = stylesheet
.to_css(PrinterOptions {
minify: true,
..PrinterOptions::default()
})
.unwrap();
assert_eq!(res.code, expected);
}
fn minify_error_test_with_options<'i, 'o>(
source: &'i str,
error: MinifyErrorKind,
options: ParserOptions<'o, 'i>,
) {
let mut stylesheet = StyleSheet::parse(&source, options.clone()).unwrap();
match stylesheet.minify(MinifyOptions::default()) {
Err(e) => assert_eq!(e.kind, error),
_ => unreachable!(),
}
}
fn prefix_test(source: &str, expected: &str, targets: Browsers) {
let mut stylesheet = StyleSheet::parse(&source, ParserOptions::default()).unwrap();
stylesheet
.minify(MinifyOptions {
targets: targets.into(),
..MinifyOptions::default()
})
.unwrap();
let res = stylesheet
.to_css(PrinterOptions {
targets: targets.into(),
..PrinterOptions::default()
})
.unwrap();
assert_eq!(res.code, expected);
}
fn attr_test(source: &str, expected: &str, minify: bool, targets: Option<Browsers>) {
let mut attr = StyleAttribute::parse(source, ParserOptions::default()).unwrap();
attr.minify(MinifyOptions {
targets: targets.into(),
..MinifyOptions::default()
});
let res = attr
.to_css(PrinterOptions {
targets: targets.into(),
minify,
..PrinterOptions::default()
})
.unwrap();
assert_eq!(res.code, expected);
}
fn nesting_test(source: &str, expected: &str) {
nesting_test_with_targets(
source,
expected,
Browsers {
chrome: Some(95 << 16),
..Browsers::default()
}
.into(),
);
}
fn nesting_test_with_targets(source: &str, expected: &str, targets: Targets) {
let mut stylesheet = StyleSheet::parse(&source, ParserOptions::default()).unwrap();
stylesheet
.minify(MinifyOptions {
targets,
..MinifyOptions::default()
})
.unwrap();
let res = stylesheet
.to_css(PrinterOptions {
targets,
..PrinterOptions::default()
})
.unwrap();
assert_eq!(res.code, expected);
}
fn nesting_test_no_targets(source: &str, expected: &str) {
let mut stylesheet = StyleSheet::parse(&source, ParserOptions::default()).unwrap();
stylesheet.minify(MinifyOptions::default()).unwrap();
let res = stylesheet.to_css(PrinterOptions::default()).unwrap();
assert_eq!(res.code, expected);
}
fn css_modules_test<'i>(
source: &'i str,
expected: &str,
expected_exports: CssModuleExports,
expected_references: CssModuleReferences,
config: crate::css_modules::Config<'i>,
minify: bool,
) {
let mut stylesheet = StyleSheet::parse(
&source,
ParserOptions {
filename: "test.css".into(),
css_modules: Some(config),
..ParserOptions::default()
},
)
.unwrap();
stylesheet.minify(MinifyOptions::default()).unwrap();
let res = stylesheet
.to_css(PrinterOptions {
minify,
..Default::default()
})
.unwrap();
assert_eq!(res.code, expected);
assert_eq!(res.exports.unwrap(), expected_exports);
assert_eq!(res.references.unwrap(), expected_references);
}
fn custom_media_test(source: &str, expected: &str) {
let mut stylesheet = StyleSheet::parse(
&source,
ParserOptions {
flags: ParserFlags::CUSTOM_MEDIA,
..ParserOptions::default()
},
)
.unwrap();
stylesheet
.minify(MinifyOptions {
targets: Browsers {
chrome: Some(95 << 16),
..Browsers::default()
}
.into(),
..MinifyOptions::default()
})
.unwrap();
let res = stylesheet.to_css(PrinterOptions::default()).unwrap();
assert_eq!(res.code, expected);
}
fn error_test(source: &str, error: ParserError) {
let res = StyleSheet::parse(&source, ParserOptions::default());
match res {
Ok(_) => unreachable!(),
Err(e) => assert_eq!(e.kind, error),
}
}
fn css_modules_error_test(source: &str, error: ParserError) {
let res = StyleSheet::parse(
&source,
ParserOptions {
css_modules: Some(Default::default()),
..Default::default()
},
);
match res {
Ok(_) => unreachable!(),
Err(e) => assert_eq!(e.kind, error),
}
}
macro_rules! map(
{ $($key:expr => $name:literal $(referenced: $referenced: literal)? $($value:literal $(global: $global: literal)? $(from $from:literal)?)*),* } => {
{
#[allow(unused_mut)]
let mut m = HashMap::new();
$(
#[allow(unused_mut)]
let mut v = Vec::new();
#[allow(unused_macros)]
macro_rules! insert {
($local:literal from $specifier:literal) => {
v.push(CssModuleReference::Dependency {
name: $local.into(),
specifier: $specifier.into()
});
};
($local:literal global: $is_global: literal) => {
v.push(CssModuleReference::Global {
name: $local.into()
});
};
($local:literal) => {
v.push(CssModuleReference::Local {
name: $local.into()
});
};
}
$(
insert!($value $(global: $global)? $(from $from)?);
)*
macro_rules! is_referenced {
($ref: literal) => {
$ref
};
() => {
false
};
}
m.insert($key.into(), CssModuleExport {
name: $name.into(),
composes: v,
is_referenced: is_referenced!($($referenced)?)
});
)*
m
}
};
);
#[test]
pub fn test_border_spacing() {
minify_test(
r#"
.foo {
border-spacing: 0px;
}
"#,
indoc! {".foo{border-spacing:0}"
},
);
minify_test(
r#"
.foo {
border-spacing: 0px 0px;
}
"#,
indoc! {".foo{border-spacing:0}"
},
);
minify_test(
r#"
.foo {
border-spacing: 12px 0px;
}
"#,
indoc! {".foo{border-spacing:12px 0}"
},
);
minify_test(
r#"
.foo {
border-spacing: calc(3px * 2) calc(5px * 0);
}
"#,
indoc! {".foo{border-spacing:6px 0}"
},
);
minify_test(
r#"
.foo {
border-spacing: calc(3px * 2) max(0px, 8px);
}
"#,
indoc! {".foo{border-spacing:6px 8px}"
},
);
// TODO: The `<length>` in border-spacing cannot have a negative value,
// we may need to implement NonNegativeLength like Servo does.
// Servo Code: https://github.com/servo/servo/blob/08bc2d53579c9ab85415d4363888881b91df073b/components/style/values/specified/length.rs#L875
// CSSWG issue: https://lists.w3.org/Archives/Public/www-style/2008Sep/0161.html
// `border-spacing = <length> <length>?`
minify_test(
r#"
.foo {
border-spacing: -20px;
}
"#,
indoc! {".foo{border-spacing:-20px}"
},
);
}
#[test]
pub fn test_border() {
test(
r#"
.foo {
border-left: 2px solid red;
border-right: 2px solid red;
border-bottom: 2px solid red;
border-top: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border: 2px solid red;
}
"#
},
);
test(
r#"
.foo {
border-left-color: red;
border-right-color: red;
border-bottom-color: red;
border-top-color: red;
}
"#,
indoc! {r#"
.foo {
border-color: red;
}
"#
},
);
test(
r#"
.foo {
border-left-width: thin;
border-right-width: thin;
border-bottom-width: thin;
border-top-width: thin;
}
"#,
indoc! {r#"
.foo {
border-width: thin;
}
"#
},
);
test(
r#"
.foo {
border-left-style: dotted;
border-right-style: dotted;
border-bottom-style: dotted;
border-top-style: dotted;
}
"#,
indoc! {r#"
.foo {
border-style: dotted;
}
"#
},
);
test(
r#"
.foo {
border-left-width: thin;
border-left-style: dotted;
border-left-color: red;
}
"#,
indoc! {r#"
.foo {
border-left: thin dotted red;
}
"#
},
);
test(
r#"
.foo {
border-left-width: thick;
border-left: thin dotted red;
}
"#,
indoc! {r#"
.foo {
border-left: thin dotted red;
}
"#
},
);
test(
r#"
.foo {
border-left-width: thick;
border: thin dotted red;
}
"#,
indoc! {r#"
.foo {
border: thin dotted red;
}
"#
},
);
test(
r#"
.foo {
border: thin dotted red;
border-right-width: thick;
}
"#,
indoc! {r#"
.foo {
border: thin dotted red;
border-right-width: thick;
}
"#
},
);
test(
r#"
.foo {
border: thin dotted red;
border-right: thick dotted red;
}
"#,
indoc! {r#"
.foo {
border: thin dotted red;
border-right-width: thick;
}
"#
},
);
test(
r#"
.foo {
border: thin dotted red;
border-right-width: thick;
border-right-style: solid;
}
"#,
indoc! {r#"
.foo {
border: thin dotted red;
border-right: thick solid red;
}
"#
},
);
test(
r#"
.foo {
border-top: thin dotted red;
border-block-start: thick solid green;
}
"#,
indoc! {r#"
.foo {
border-top: thin dotted red;
border-block-start: thick solid green;
}
"#
},
);
test(
r#"
.foo {
border: thin dotted red;
border-block-start-width: thick;
border-left-width: medium;
}
"#,
indoc! {r#"
.foo {
border: thin dotted red;
border-block-start-width: thick;
border-left-width: medium;
}
"#
},
);
test(
r#"
.foo {
border-block-start: thin dotted red;
border-inline-end: thin dotted red;
}
"#,
indoc! {r#"
.foo {
border-block-start: thin dotted red;
border-inline-end: thin dotted red;
}
"#
},
);
test(
r#"
.foo {
border-block-start-width: thin;
border-block-start-style: dotted;
border-block-start-color: red;
border-inline-end: thin dotted red;
}
"#,
indoc! {r#"
.foo {
border-block-start: thin dotted red;
border-inline-end: thin dotted red;
}
"#
},
);
test(
r#"
.foo {
border-block-start: thin dotted red;
border-block-end: thin dotted red;
}
"#,
indoc! {r#"
.foo {
border-block: thin dotted red;
}
"#
},
);
minify_test(
r#"
.foo {
border: none;
}
"#,
indoc! {".foo{border:none}"
},
);
minify_test(".foo { border-width: 0 0 1px; }", ".foo{border-width:0 0 1px}");
test(
r#"
.foo {
border-block-width: 1px;
border-inline-width: 1px;
}
"#,
indoc! {r#"
.foo {
border-width: 1px;
}
"#
},
);
test(
r#"
.foo {
border-block-start-width: 1px;
border-block-end-width: 1px;
border-inline-start-width: 1px;
border-inline-end-width: 1px;
}
"#,
indoc! {r#"
.foo {
border-width: 1px;
}
"#
},
);
test(
r#"
.foo {
border-block-start-width: 1px;
border-block-end-width: 1px;
border-inline-start-width: 2px;
border-inline-end-width: 2px;
}
"#,
indoc! {r#"
.foo {
border-block-width: 1px;
border-inline-width: 2px;
}
"#
},
);
test(
r#"
.foo {
border-block-start-width: 1px;
border-block-end-width: 1px;
border-inline-start-width: 2px;
border-in
741A
line-end-width: 3px;
}
"#,
indoc! {r#"
.foo {
border-block-width: 1px;
border-inline-width: 2px 3px;
}
"#
},
);
minify_test(
".foo { border-bottom: 1px solid var(--spectrum-global-color-gray-200)}",
".foo{border-bottom:1px solid var(--spectrum-global-color-gray-200)}",
);
test(
r#"
.foo {
border-width: 0;
border-bottom: var(--test, 1px) solid;
}
"#,
indoc! {r#"
.foo {
border-width: 0;
border-bottom: var(--test, 1px) solid;
}
"#
},
);
test(
r#"
.foo {
border: 1px solid black;
border-width: 1px 1px 0 0;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-width: 1px 1px 0 0;
}
"#},
);
test(
r#"
.foo {
border-top: 1px solid black;
border-bottom: 1px solid black;
border-left: 2px solid black;
border-right: 2px solid black;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-width: 1px 2px;
}
"#},
);
test(
r#"
.foo {
border-top: 1px solid black;
border-bottom: 1px solid black;
border-left: 2px solid black;
border-right: 1px solid black;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-left-width: 2px;
}
"#},
);
test(
r#"
.foo {
border-top: 1px solid black;
border-bottom: 1px solid black;
border-left: 1px solid red;
border-right: 1px solid red;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-color: #000 red;
}
"#},
);
test(
r#"
.foo {
border-block-start: 1px solid black;
border-block-end: 1px solid black;
border-inline-start: 1px solid red;
border-inline-end: 1px solid red;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-inline-color: red;
}
"#},
);
test(
r#"
.foo {
border-block-start: 1px solid black;
border-block-end: 1px solid black;
border-inline-start: 2px solid black;
border-inline-end: 2px solid black;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-inline-width: 2px;
}
"#},
);
test(
r#"
.foo {
border-block-start: 1px solid black;
border-block-end: 1px solid black;
border-inline-start: 2px solid red;
border-inline-end: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-inline: 2px solid red;
}
"#},
);
test(
r#"
.foo {
border-block-start: 1px solid black;
border-block-end: 1px solid black;
border-inline-start: 2px solid red;
border-inline-end: 3px solid red;
}
"#,
indoc! {r#"
.foo {
border: 1px solid #000;
border-inline-start: 2px solid red;
border-inline-end: 3px solid red;
}
"#},
);
test(
r#"
.foo {
border-block-start: 2px solid black;
border-block-end: 1px solid black;
border-inline-start: 2px solid red;
border-inline-end: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border: 2px solid red;
border-block-start-color: #000;
border-block-end: 1px solid #000;
}
"#},
);
test(
r#"
.foo {
border-block-start: 2px solid red;
border-block-end: 1px solid red;
border-inline-start: 2px solid red;
border-inline-end: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border: 2px solid red;
border-block-end-width: 1px;
}
"#},
);
test(
r#"
.foo {
border-block-start: 2px solid red;
border-block-end: 2px solid red;
border-inline-start: 2px solid red;
border-inline-end: 1px solid red;
}
"#,
indoc! {r#"
.foo {
border: 2px solid red;
border-inline-end-width: 1px;
}
"#},
);
test(
r#"
.foo {
border: 1px solid currentColor;
}
"#,
indoc! {r#"
.foo {
border: 1px solid;
}
"#
},
);
minify_test(
r#"
.foo {
border: 1px solid currentColor;
}
"#,
".foo{border:1px solid}",
);
prefix_test(
r#"
.foo {
border-block: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border-top: 2px solid red;
border-bottom: 2px solid red;
}
"#
},
Browsers {
safari: Some(8 << 16),
..Browsers::default()
},
);
prefix_test(
r#"
.foo {
border-block-start: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border-top: 2px solid red;
}
"#
},
Browsers {
safari: Some(8 << 16),
..Browsers::default()
},
);
prefix_test(
r#"
.foo {
border-block-end: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border-bottom: 2px solid red;
}
"#
},
Browsers {
safari: Some(8 << 16),
..Browsers::default()
},
);
prefix_test(
r#"
.foo {
border-inline: 2px solid red;
}
"#,
indoc! {r#"
.foo {
border-left: 2px solid red;
border-right: 2px solid red;
}
"#
},
Browsers {
safari: Some(8 << 16),
..Browsers::default()
},
);
prefix_test(
r#"