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Lazily compile GlobMatchers

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cyqsimon 2023-11-05 02:46:32 +08:00
parent 4ad3002543
commit f483d2df42
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GPG key ID: 1D8CE2F297390D65
2 changed files with 20 additions and 13 deletions
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10
src/bin/bat/main.rs
View file

@ -78,9 +78,11 @@ fn run_cache_subcommand(
Ok(())
}
fn get_syntax_mapping_to_paths<'a>(
mappings: &[(&GlobMatcher, &MappingTarget<'a>)],
) -> HashMap<&'a str, Vec<String>> {
fn get_syntax_mapping_to_paths<'r, 't, I>(mappings: I) -> HashMap<&'t str, Vec<String>>
where
I: IntoIterator<Item = (&'r GlobMatcher, &'r MappingTarget<'t>)>,
't: 'r, // target text outlives rule
{
let mut map = HashMap::new();
for mapping in mappings {
if let (matcher, MappingTarget::MapTo(s)) = mapping {
@ -123,7 +125,7 @@ pub fn get_languages(config: &Config, cache_dir: &Path) -> Result<String> {
languages.sort_by_key(|lang| lang.name.to_uppercase());
let configured_languages = get_syntax_mapping_to_paths(&config.syntax_mapping.all_mappings());
let configured_languages = get_syntax_mapping_to_paths(config.syntax_mapping.all_mappings());
for lang in &mut languages {
if let Some(additional_paths) = configured_languages.get(lang.name.as_str()) {

23
src/syntax_mapping.rs
View file

@ -56,30 +56,35 @@ impl<'a> SyntaxMapping<'a> {
Ok(())
}
/// Returns all mappings. User-defined mappings are listed before builtin
/// mappings; mappings in front have higher precedence.
/// Returns an iterator over all mappings. User-defined mappings are listed
/// before builtin mappings; mappings in front have higher precedence.
///
/// Builtin mappings' `GlobMatcher`s are lazily compiled.
///
/// Note that this function ignores builtin mappings that are invalid under
/// the current environment (i.e. their rules require an environment
/// variable that is unset).
pub fn all_mappings(&self) -> Vec<(&GlobMatcher, &MappingTarget<'a>)> {
pub fn all_mappings(&self) -> impl Iterator<Item = (&GlobMatcher, &MappingTarget<'a>)> {
self.custom_mappings()
.iter()
.map(|(matcher, target)| (matcher, target)) // as_ref
.chain(self.builtin_mappings())
.collect()
}
/// Returns all valid builtin mappings. Mappings in front have higher
/// precedence.
// IMPRV: ideally `Item` should be `(&'static GlobMatcher, &'static MappingTarget<'static>)`
// but `Iterator::chain` (used in `SyntaxMapping::all_mappings`) asserts `Item = Self::Item`
// so we need a lifetime downcast, which I'm not sure how to perform
/// Returns an iterator over all valid builtin mappings. Mappings in front
/// have higher precedence.
///
/// The `GlabMatcher`s are lazily compiled.
///
/// If a mapping rule requires an environment variable that is unset, it
/// will be ignored.
pub fn builtin_mappings(&self) -> Vec<(&'static GlobMatcher, &'static MappingTarget<'static>)> {
pub fn builtin_mappings(&self) -> impl Iterator<Item = (&GlobMatcher, &MappingTarget<'a>)> {
BUILTIN_MAPPINGS
.iter()
.filter_map(|(matcher, target)| matcher.as_ref().map(|glob| (glob, target)))
.collect()
}
/// Returns all user-defined mappings.
@ -91,7 +96,7 @@ impl<'a> SyntaxMapping<'a> {
// Try matching on the file name as-is.
let candidate = Candidate::new(&path);
let candidate_filename = path.as_ref().file_name().map(Candidate::new);
for (glob, syntax) in self.all_mappings().into_iter() {
for (glob, syntax) in self.all_mappings() {
if glob.is_match_candidate(&candidate)
|| candidate_filename
.as_ref()