/
css_modules.rs
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/
css_modules.rs
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//! CSS module exports.
//!
//! [CSS modules](https://github.com/css-modules/css-modules) are a way of locally scoping names in a
//! CSS file. This includes class names, ids, keyframe animation names, and any other places where the
//! [CustomIdent](super::values::ident::CustomIdent) type is used.
//!
//! CSS modules can be enabled using the `css_modules` option when parsing a style sheet. When the
//! style sheet is printed, hashes will be added to any declared names, and references to those names
//! will be updated accordingly. A map of the original names to compiled (hashed) names will be returned.
use crate::error::PrinterErrorKind;
use crate::properties::css_modules::{Composes, ComposesFrom};
use crate::selector::Selectors;
use data_encoding::{Encoding, Specification};
use lazy_static::lazy_static;
use parcel_selectors::SelectorList;
use serde::Serialize;
use smallvec::{smallvec, SmallVec};
use std::collections::hash_map::DefaultHasher;
use std::collections::HashMap;
use std::fmt::Write;
use std::hash::{Hash, Hasher};
use std::path::Path;
/// Configuration for CSS modules.
#[derive(Default, Clone, Debug)]
pub struct Config<'i> {
/// The class name pattern to use. Default is `[hash]_[local]`.
pub pattern: Pattern<'i>,
}
/// A CSS modules class name pattern.
#[derive(Clone, Debug)]
pub struct Pattern<'i> {
/// The list of segments in the pattern.
pub segments: SmallVec<[Segment<'i>; 2]>,
}
impl<'i> Default for Pattern<'i> {
fn default() -> Self {
Pattern {
segments: smallvec![Segment::Hash, Segment::Literal("_"), Segment::Local],
}
}
}
impl<'i> Pattern<'i> {
/// Parse a pattern from a string.
pub fn parse(mut input: &'i str) -> Result<Self, ()> {
let mut segments = SmallVec::new();
while !input.is_empty() {
if input.starts_with('[') {
if let Some(end_idx) = input.find(']') {
let segment = match &input[0..=end_idx] {
"[name]" => Segment::Name,
"[local]" => Segment::Local,
"[hash]" => Segment::Hash,
_ => return Err(()),
};
segments.push(segment);
input = &input[end_idx + 1..];
} else {
return Err(());
}
} else {
let end_idx = input.find('[').unwrap_or_else(|| input.len());
segments.push(Segment::Literal(&input[0..end_idx]));
input = &input[end_idx..];
}
}
Ok(Pattern { segments })
}
/// Write the substituted pattern to a destination.
pub fn write<W, E>(&self, hash: &str, path: &Path, local: &str, mut write: W) -> Result<(), E>
where
W: FnMut(&str) -> Result<(), E>,
{
for segment in &self.segments {
match segment {
Segment::Literal(s) => {
write(s)?;
}
Segment::Name => {
write(path.file_stem().unwrap().to_str().unwrap())?;
}
Segment::Local => {
write(local)?;
}
Segment::Hash => {
write(hash)?;
}
}
}
Ok(())
}
fn write_to_string(&self, hash: &str, path: &Path, local: &str) -> Result<String, std::fmt::Error> {
let mut res = String::new();
self.write(hash, path, local, |s| res.write_str(s))?;
Ok(res)
}
}
/// A segment in a CSS modules class name pattern.
///
/// See [Pattern](Pattern).
#[derive(Clone, Debug)]
pub enum Segment<'i> {
/// A literal string segment.
Literal(&'i str),
/// The base file name.
Name,
/// The original class name.
Local,
/// A hash of the file name.
Hash,
}
/// A referenced name within a CSS module, e.g. via the `composes` property.
///
/// See [CssModuleExport](CssModuleExport).
#[derive(PartialEq, Debug, Clone, Serialize)]
#[serde(tag = "type", rename_all = "lowercase")]
pub enum CssModuleReference {
/// A local reference.
Local {
/// The local (compiled) name for the reference.
name: String,
},
/// A global reference.
Global {
/// The referenced global name.
name: String,
},
/// A reference to an export in a different file.
Dependency {
/// The name to reference within the dependency.
name: String,
/// The dependency specifier for the referenced file.
specifier: String,
},
}
/// An exported value from a CSS module.
#[derive(PartialEq, Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct CssModuleExport {
/// The local (compiled) name for this export.
pub name: String,
/// Other names that are composed by this export.
pub composes: Vec<CssModuleReference>,
/// Whether the export is referenced in this file.
pub is_referenced: bool,
}
/// A map of exported names to values.
pub type CssModuleExports = HashMap<String, CssModuleExport>;
lazy_static! {
static ref ENCODER: Encoding = {
let mut spec = Specification::new();
spec
.symbols
.push_str("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890_-");
spec.encoding().unwrap()
};
}
pub(crate) struct CssModule<'a, 'b, 'c> {
pub config: &'a Config<'b>,
pub path: &'c Path,
pub hash: String,
pub exports: &'a mut CssModuleExports,
}
impl<'a, 'b, 'c> CssModule<'a, 'b, 'c> {
pub fn new(config: &'a Config<'b>, filename: &'c str, exports: &'a mut CssModuleExports) -> Self {
Self {
config,
path: Path::new(filename),
hash: hash(filename, matches!(config.pattern.segments[0], Segment::Hash)),
exports,
}
}
pub fn add_local(&mut self, exported: &str, local: &str) {
self.exports.entry(exported.into()).or_insert_with(|| CssModuleExport {
name: self.config.pattern.write_to_string(&self.hash, &self.path, local).unwrap(),
composes: vec![],
is_referenced: false,
});
}
pub fn reference(&mut self, name: &str) {
match self.exports.entry(name.into()) {
std::collections::hash_map::Entry::Occupied(mut entry) => {
entry.get_mut().is_referenced = true;
}
std::collections::hash_map::Entry::Vacant(entry) => {
entry.insert(CssModuleExport {
name: self.config.pattern.write_to_string(&self.hash, &self.path, name).unwrap(),
composes: vec![],
is_referenced: true,
});
}
}
}
pub fn handle_composes(
&mut self,
selectors: &SelectorList<Selectors>,
composes: &Composes,
) -> Result<(), PrinterErrorKind> {
for sel in &selectors.0 {
if sel.len() == 1 {
match sel.iter_raw_match_order().next().unwrap() {
parcel_selectors::parser::Component::Class(ref id) => {
for name in &composes.names {
let reference = match &composes.from {
None => CssModuleReference::Local {
name: self
.config
.pattern
.write_to_string(&self.hash, &self.path, name.0.as_ref())
.unwrap(),
},
Some(ComposesFrom::Global) => CssModuleReference::Global {
name: name.0.as_ref().into(),
},
Some(ComposesFrom::File(file)) => CssModuleReference::Dependency {
name: name.0.to_string(),
specifier: file.to_string(),
},
};
let export = self.exports.get_mut(&id.0.as_ref().to_owned()).unwrap();
if !export.composes.contains(&reference) {
export.composes.push(reference);
}
}
continue;
}
_ => {}
}
}
// The composes property can only be used within a simple class selector.
return Err(PrinterErrorKind::InvalidComposesSelector);
}
Ok(())
}
}
pub(crate) fn hash(s: &str, at_start: bool) -> String {
let mut hasher = DefaultHasher::new();
s.hash(&mut hasher);
let hash = hasher.finish() as u32;
let hash = ENCODER.encode(&hash.to_le_bytes());
if at_start && matches!(hash.as_bytes()[0], b'0'..=b'9') {
format!("_{}", hash)
} else {
hash
}
}