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https://github.com/denoland/deno.git
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99 lines
2.9 KiB
Rust
99 lines
2.9 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use std::collections::HashMap;
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use std::sync::Arc;
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use deno_ast::MediaType;
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use deno_ast::ModuleSpecifier;
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use deno_ast::ParsedSource;
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use deno_core::parking_lot::Mutex;
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use deno_graph::CapturingModuleParser;
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use deno_graph::ModuleParser;
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use deno_graph::ParseOptions;
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#[derive(Default)]
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pub struct ParsedSourceCache {
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sources: Mutex<HashMap<ModuleSpecifier, ParsedSource>>,
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}
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impl ParsedSourceCache {
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pub fn get_parsed_source_from_esm_module(
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&self,
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module: &deno_graph::EsmModule,
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) -> Result<ParsedSource, deno_ast::Diagnostic> {
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self.get_or_parse_module(
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&module.specifier,
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module.source.clone(),
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module.media_type,
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)
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}
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/// Gets the matching `ParsedSource` from the cache
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/// or parses a new one and stores that in the cache.
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pub fn get_or_parse_module(
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&self,
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specifier: &deno_graph::ModuleSpecifier,
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source: Arc<str>,
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media_type: MediaType,
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) -> deno_core::anyhow::Result<ParsedSource, deno_ast::Diagnostic> {
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let parser = self.as_capturing_parser();
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// this will conditionally parse because it's using a CapturingModuleParser
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parser.parse_module(ParseOptions {
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specifier,
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source,
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media_type,
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// don't bother enabling because this method is currently only used for emitting
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scope_analysis: false,
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})
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}
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/// Frees the parsed source from memory.
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pub fn free(&self, specifier: &ModuleSpecifier) {
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self.sources.lock().remove(specifier);
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}
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/// Creates a parser that will reuse a ParsedSource from the store
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/// if it exists, or else parse.
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pub fn as_capturing_parser(&self) -> CapturingModuleParser {
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CapturingModuleParser::new(None, self)
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}
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}
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/// It's ok that this is racy since in non-LSP situations
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/// this will only ever store one form of a parsed source
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/// and in LSP settings the concurrency will be enforced
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/// at a higher level to ensure this will have the latest
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/// parsed source.
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impl deno_graph::ParsedSourceStore for ParsedSourceCache {
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fn set_parsed_source(
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&self,
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specifier: deno_graph::ModuleSpecifier,
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parsed_source: ParsedSource,
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) -> Option<ParsedSource> {
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self.sources.lock().insert(specifier, parsed_source)
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}
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fn get_parsed_source(
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&self,
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specifier: &deno_graph::ModuleSpecifier,
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) -> Option<ParsedSource> {
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self.sources.lock().get(specifier).cloned()
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}
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fn get_scope_analysis_parsed_source(
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&self,
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specifier: &deno_graph::ModuleSpecifier,
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) -> Option<ParsedSource> {
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let mut sources = self.sources.lock();
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let parsed_source = sources.get(specifier)?;
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if parsed_source.has_scope_analysis() {
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Some(parsed_source.clone())
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} else {
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// upgrade to have scope analysis
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let parsed_source = sources.remove(specifier).unwrap();
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let parsed_source = parsed_source.into_with_scope_analysis();
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sources.insert(specifier.clone(), parsed_source.clone());
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Some(parsed_source)
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}
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}
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}
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