forked from swc-project/swc
/
mod.rs
133 lines (109 loc) · 4.17 KB
/
mod.rs
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use swc_common::{Spanned, DUMMY_SP};
use swc_css_ast::{
AtRule, ComponentValue, MediaAnd, MediaCondition, MediaConditionAllType,
MediaConditionWithoutOr, MediaInParens, MediaQuery, Rule, SupportsCondition,
};
use swc_css_visit::{VisitMut, VisitMutWith};
use self::custom_media::CustomMediaHandler;
use crate::feature::Features;
mod color_hex_alpha;
mod custom_media;
mod media_query_ranges;
/// Compiles a modern CSS file to a CSS file which works with old browsers.
#[derive(Debug)]
pub struct Compiler {
#[allow(unused)]
c: Config,
custom_media: CustomMediaHandler,
in_supports_condition: bool,
}
#[derive(Debug)]
pub struct Config {
/// The list of features to **process**.
pub process: Features,
}
impl Compiler {
pub fn new(config: Config) -> Self {
Self {
c: config,
custom_media: Default::default(),
in_supports_condition: Default::default(),
}
}
}
impl VisitMut for Compiler {
fn visit_mut_at_rule(&mut self, n: &mut AtRule) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::CUSTOM_MEDIA) {
self.custom_media.store_custom_media(n);
}
}
fn visit_mut_supports_condition(&mut self, n: &mut SupportsCondition) {
let old_in_support_condition = self.in_supports_condition;
self.in_supports_condition = true;
n.visit_mut_children_with(self);
self.in_supports_condition = old_in_support_condition;
}
fn visit_mut_media_query(&mut self, n: &mut MediaQuery) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::CUSTOM_MEDIA) {
self.custom_media.process_media_query(n);
}
}
fn visit_mut_media_condition(&mut self, n: &mut MediaCondition) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::CUSTOM_MEDIA) {
self.custom_media.process_media_condition(n);
}
}
fn visit_mut_media_condition_without_or(&mut self, n: &mut MediaConditionWithoutOr) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::CUSTOM_MEDIA) {
self.custom_media.process_media_condition_without_or(n);
}
}
fn visit_mut_rules(&mut self, n: &mut Vec<Rule>) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::CUSTOM_MEDIA) {
self.custom_media.process_rules(n);
}
}
fn visit_mut_media_in_parens(&mut self, n: &mut MediaInParens) {
n.visit_mut_children_with(self);
if self.c.process.contains(Features::MEDIA_QUERY_RANGES) {
if let MediaInParens::Feature(media_feature) = n {
if let Some(legacy_media_feature) = self.get_legacy_media_feature(media_feature) {
match legacy_media_feature {
(legacy_media_feature, None) => {
*media_feature = Box::new(legacy_media_feature);
}
(left, Some(right)) => {
*n = MediaInParens::MediaCondition(MediaCondition {
span: n.span(),
conditions: vec![
MediaConditionAllType::MediaInParens(*Box::new(
MediaInParens::Feature(Box::new(left)),
)),
MediaConditionAllType::And(MediaAnd {
span: DUMMY_SP,
keyword: None,
condition: MediaInParens::Feature(Box::new(right)),
}),
],
});
}
}
}
}
}
}
fn visit_mut_component_value(&mut self, n: &mut ComponentValue) {
n.visit_mut_children_with(self);
if self.in_supports_condition {
return;
}
if self.c.process.contains(Features::COLOR_HEX_ALPHA) {
self.process_color_hex_alpha(n);
}
}
}