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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::ParseDiagnostic;
use deno_ast::ParsedSource;
use deno_core::parking_lot::Mutex;
use deno_graph::CapturingModuleParser;
use deno_graph::DefaultModuleParser;
use deno_graph::ModuleParser;
use deno_graph::ParseOptions;
use deno_graph::ParsedSourceStore;
/// Lazily parses JS/TS sources from a `deno_graph::ModuleGraph` given
/// a `ParsedSourceCache`. Note that deno_graph doesn't necessarily cause
/// files to end up in the `ParsedSourceCache` because it might have all
/// the information it needs via caching in order to skip parsing.
#[derive(Clone, Copy)]
pub struct LazyGraphSourceParser<'a> {
cache: &'a ParsedSourceCache,
graph: &'a deno_graph::ModuleGraph,
}
impl<'a> LazyGraphSourceParser<'a> {
pub fn new(
cache: &'a ParsedSourceCache,
graph: &'a deno_graph::ModuleGraph,
) -> Self {
Self { cache, graph }
}
pub fn get_or_parse_source(
&self,
module_specifier: &ModuleSpecifier,
) -> Result<Option<deno_ast::ParsedSource>, deno_ast::ParseDiagnostic> {
let Some(deno_graph::Module::Js(module)) = self.graph.get(module_specifier)
else {
return Ok(None);
};
self
.cache
.get_parsed_source_from_js_module(module)
.map(Some)
}
}
#[derive(Default)]
pub struct ParsedSourceCache {
sources: Mutex<HashMap<ModuleSpecifier, ParsedSource>>,
}
impl ParsedSourceCache {
pub fn get_parsed_source_from_js_module(
&self,
module: &deno_graph::JsModule,
) -> Result<ParsedSource, deno_ast::ParseDiagnostic> {
let parser = self.as_capturing_parser();
// this will conditionally parse because it's using a CapturingModuleParser
parser.parse_module(ParseOptions {
specifier: &module.specifier,
source: module.source.clone(),
media_type: module.media_type,
// don't bother enabling because this method is currently only used for vendoring
scope_analysis: false,
})
}
pub fn remove_or_parse_module(
&self,
specifier: &ModuleSpecifier,
source: Arc<str>,
media_type: MediaType,
) -> Result<ParsedSource, deno_ast::ParseDiagnostic> {
if let Some(parsed_source) = self.remove_parsed_source(specifier) {
if parsed_source.media_type() == media_type
&& parsed_source.text().as_ref() == source.as_ref()
{
// note: message used tests
log::debug!("Removed parsed source: {}", specifier);
return Ok(parsed_source);
}
}
let options = ParseOptions {
specifier,
source,
media_type,
// don't bother enabling because this method is currently only used for emitting
scope_analysis: false,
};
DefaultModuleParser.parse_module(options)
}
/// 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: ModuleSpecifier,
parsed_source: ParsedSource,
) -> Option<ParsedSource> {
self.sources.lock().insert(specifier, parsed_source)
}
fn get_parsed_source(
&self,
specifier: &ModuleSpecifier,
) -> Option<ParsedSource> {
self.sources.lock().get(specifier).cloned()
}
fn remove_parsed_source(
&self,
specifier: &ModuleSpecifier,
) -> Option<ParsedSource> {
self.sources.lock().remove(specifier)
}
fn get_scope_analysis_parsed_source(
&self,
specifier: &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)
}
}
}
pub struct EsmOrCjsChecker {
parsed_source_cache: Arc<ParsedSourceCache>,
}
impl EsmOrCjsChecker {
pub fn new(parsed_source_cache: Arc<ParsedSourceCache>) -> Self {
Self {
parsed_source_cache,
}
}
pub fn is_esm(
&self,
specifier: &ModuleSpecifier,
source: Arc<str>,
media_type: MediaType,
) -> Result<bool, ParseDiagnostic> {
// todo(dsherret): add a file cache here to avoid parsing with swc on each run
let source = match self.parsed_source_cache.get_parsed_source(specifier) {
Some(source) => source.clone(),
None => {
let source = deno_ast::parse_program(deno_ast::ParseParams {
specifier: specifier.clone(),
text: source,
media_type,
capture_tokens: true, // capture because it's used for cjs export analysis
scope_analysis: false,
maybe_syntax: None,
})?;
self
.parsed_source_cache
.set_parsed_source(specifier.clone(), source.clone());
source
}
};
Ok(source.is_module())
}
}
|
