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