mirror of
https://github.com/denoland/deno.git
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136dce67ce
1. Breaks up functionality within `ProcState` into several other structs to break out the responsibilities (`ProcState` is only a data struct now). 2. Moves towards being able to inject dependencies more easily and have functionality only require what it needs. 3. Exposes `Arc<T>` around the "service structs" instead of it being embedded within them. The idea behind embedding them was to reduce the verbosity of needing to pass around `Arc<...>`, but I don't think it was exactly working and as we move more of these structs to be more injectable I don't think the extra verbosity will be a big deal.
690 lines
19 KiB
Rust
690 lines
19 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::collections::HashSet;
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use std::collections::VecDeque;
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use std::fmt::Write;
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use std::path::Path;
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use std::path::PathBuf;
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use std::sync::Arc;
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use deno_ast::swc::common::SyntaxContext;
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use deno_ast::view::Node;
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use deno_ast::view::NodeTrait;
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use deno_ast::CjsAnalysis;
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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_ast::SourceRanged;
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use deno_core::anyhow::anyhow;
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use deno_core::error::AnyError;
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use deno_runtime::deno_node::package_exports_resolve;
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use deno_runtime::deno_node::NodeModuleKind;
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use deno_runtime::deno_node::NodePermissions;
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use deno_runtime::deno_node::NodeResolutionMode;
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use deno_runtime::deno_node::PackageJson;
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use deno_runtime::deno_node::PathClean;
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use deno_runtime::deno_node::RealFs;
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use deno_runtime::deno_node::RequireNpmResolver;
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use deno_runtime::deno_node::NODE_GLOBAL_THIS_NAME;
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use once_cell::sync::Lazy;
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use crate::cache::NodeAnalysisCache;
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use crate::file_fetcher::FileFetcher;
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use crate::npm::NpmPackageResolver;
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static NODE_GLOBALS: &[&str] = &[
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"Buffer",
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"clearImmediate",
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"clearInterval",
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"clearTimeout",
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"console",
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"global",
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"process",
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"setImmediate",
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"setInterval",
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"setTimeout",
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];
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pub struct NodeCodeTranslator {
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analysis_cache: NodeAnalysisCache,
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file_fetcher: Arc<FileFetcher>,
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npm_resolver: Arc<NpmPackageResolver>,
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}
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impl NodeCodeTranslator {
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pub fn new(
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analysis_cache: NodeAnalysisCache,
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file_fetcher: Arc<FileFetcher>,
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npm_resolver: Arc<NpmPackageResolver>,
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) -> Self {
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Self {
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analysis_cache,
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file_fetcher,
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npm_resolver,
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}
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}
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pub fn esm_code_with_node_globals(
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&self,
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specifier: &ModuleSpecifier,
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code: String,
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) -> Result<String, AnyError> {
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esm_code_with_node_globals(&self.analysis_cache, specifier, code)
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}
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/// Translates given CJS module into ESM. This function will perform static
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/// analysis on the file to find defined exports and reexports.
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///
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/// For all discovered reexports the analysis will be performed recursively.
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///
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/// If successful a source code for equivalent ES module is returned.
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pub fn translate_cjs_to_esm(
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&self,
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specifier: &ModuleSpecifier,
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code: String,
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media_type: MediaType,
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permissions: &mut dyn NodePermissions,
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) -> Result<String, AnyError> {
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let mut temp_var_count = 0;
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let mut handled_reexports: HashSet<String> = HashSet::default();
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let mut source = vec![
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r#"import {createRequire as __internalCreateRequire} from "node:module";
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const require = __internalCreateRequire(import.meta.url);"#
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.to_string(),
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];
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let analysis =
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self.perform_cjs_analysis(specifier.as_str(), media_type, code)?;
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let mut all_exports = analysis
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.exports
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.iter()
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.map(|s| s.to_string())
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.collect::<HashSet<_>>();
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// (request, referrer)
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let mut reexports_to_handle = VecDeque::new();
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for reexport in analysis.reexports {
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reexports_to_handle.push_back((reexport, specifier.clone()));
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}
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while let Some((reexport, referrer)) = reexports_to_handle.pop_front() {
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if handled_reexports.contains(&reexport) {
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continue;
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}
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handled_reexports.insert(reexport.to_string());
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// First, resolve relate reexport specifier
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let resolved_reexport = self.resolve(
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&reexport,
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&referrer,
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// FIXME(bartlomieju): check if these conditions are okay, probably
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// should be `deno-require`, because `deno` is already used in `esm_resolver.rs`
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&["deno", "require", "default"],
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NodeResolutionMode::Execution,
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permissions,
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)?;
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let reexport_specifier =
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ModuleSpecifier::from_file_path(resolved_reexport).unwrap();
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// Second, read the source code from disk
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let reexport_file = self
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.file_fetcher
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.get_source(&reexport_specifier)
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.ok_or_else(|| {
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anyhow!(
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"Could not find '{}' ({}) referenced from {}",
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reexport,
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reexport_specifier,
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referrer
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)
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})?;
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{
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let analysis = self.perform_cjs_analysis(
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reexport_specifier.as_str(),
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reexport_file.media_type,
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reexport_file.source.to_string(),
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)?;
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for reexport in analysis.reexports {
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reexports_to_handle.push_back((reexport, reexport_specifier.clone()));
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}
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all_exports.extend(
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analysis
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.exports
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.into_iter()
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.filter(|e| e.as_str() != "default"),
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);
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}
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}
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source.push(format!(
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"const mod = require(\"{}\");",
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specifier
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.to_file_path()
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.unwrap()
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.to_str()
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.unwrap()
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.replace('\\', "\\\\")
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.replace('\'', "\\\'")
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.replace('\"', "\\\"")
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));
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for export in &all_exports {
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if export.as_str() != "default" {
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add_export(
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&mut source,
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export,
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&format!("mod[\"{export}\"]"),
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&mut temp_var_count,
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);
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}
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}
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source.push("export default mod;".to_string());
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let translated_source = source.join("\n");
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Ok(translated_source)
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}
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fn perform_cjs_analysis(
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&self,
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specifier: &str,
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media_type: MediaType,
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code: String,
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) -> Result<CjsAnalysis, AnyError> {
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let source_hash = NodeAnalysisCache::compute_source_hash(&code);
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if let Some(analysis) = self
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.analysis_cache
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.get_cjs_analysis(specifier, &source_hash)
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{
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return Ok(analysis);
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}
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if media_type == MediaType::Json {
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return Ok(CjsAnalysis {
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exports: vec![],
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reexports: vec![],
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});
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}
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let parsed_source = deno_ast::parse_script(deno_ast::ParseParams {
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specifier: specifier.to_string(),
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text_info: deno_ast::SourceTextInfo::new(code.into()),
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media_type,
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capture_tokens: true,
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scope_analysis: false,
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maybe_syntax: None,
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})?;
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let analysis = parsed_source.analyze_cjs();
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self
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.analysis_cache
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.set_cjs_analysis(specifier, &source_hash, &analysis);
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Ok(analysis)
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}
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fn resolve(
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&self,
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specifier: &str,
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referrer: &ModuleSpecifier,
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conditions: &[&str],
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mode: NodeResolutionMode,
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permissions: &mut dyn NodePermissions,
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) -> Result<PathBuf, AnyError> {
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if specifier.starts_with('/') {
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todo!();
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}
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let referrer_path = referrer.to_file_path().unwrap();
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if specifier.starts_with("./") || specifier.starts_with("../") {
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if let Some(parent) = referrer_path.parent() {
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return file_extension_probe(parent.join(specifier), &referrer_path);
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} else {
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todo!();
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}
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}
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// We've got a bare specifier or maybe bare_specifier/blah.js"
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let (package_specifier, package_subpath) =
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parse_specifier(specifier).unwrap();
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// todo(dsherret): use not_found error on not found here
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let resolver = self.npm_resolver.as_require_npm_resolver();
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let module_dir = resolver.resolve_package_folder_from_package(
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package_specifier.as_str(),
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&referrer_path,
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mode,
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)?;
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let package_json_path = module_dir.join("package.json");
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if package_json_path.exists() {
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let package_json = PackageJson::load::<RealFs>(
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&self.npm_resolver.as_require_npm_resolver(),
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permissions,
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package_json_path.clone(),
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)?;
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if let Some(exports) = &package_json.exports {
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return package_exports_resolve::<RealFs>(
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&package_json_path,
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package_subpath,
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exports,
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referrer,
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NodeModuleKind::Esm,
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conditions,
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mode,
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&self.npm_resolver.as_require_npm_resolver(),
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permissions,
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);
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}
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// old school
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if package_subpath != "." {
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let d = module_dir.join(package_subpath);
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if let Ok(m) = d.metadata() {
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if m.is_dir() {
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// subdir might have a package.json that specifies the entrypoint
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let package_json_path = d.join("package.json");
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if package_json_path.exists() {
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let package_json = PackageJson::load::<RealFs>(
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&self.npm_resolver.as_require_npm_resolver(),
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permissions,
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package_json_path,
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)?;
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if let Some(main) = package_json.main(NodeModuleKind::Cjs) {
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return Ok(d.join(main).clean());
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}
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}
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return Ok(d.join("index.js").clean());
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}
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}
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return file_extension_probe(d, &referrer_path);
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} else if let Some(main) = package_json.main(NodeModuleKind::Cjs) {
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return Ok(module_dir.join(main).clean());
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} else {
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return Ok(module_dir.join("index.js").clean());
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}
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}
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Err(not_found(specifier, &referrer_path))
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}
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}
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fn esm_code_with_node_globals(
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analysis_cache: &NodeAnalysisCache,
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specifier: &ModuleSpecifier,
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code: String,
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) -> Result<String, AnyError> {
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// TODO(dsherret): this code is way more inefficient than it needs to be.
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//
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// In the future, we should disable capturing tokens & scope analysis
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// and instead only use swc's APIs to go through the portions of the tree
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// that we know will affect the global scope while still ensuring that
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// `var` decls are taken into consideration.
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let source_hash = NodeAnalysisCache::compute_source_hash(&code);
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let text_info = deno_ast::SourceTextInfo::from_string(code);
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let top_level_decls = if let Some(decls) =
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analysis_cache.get_esm_analysis(specifier.as_str(), &source_hash)
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{
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HashSet::from_iter(decls)
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} else {
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let parsed_source = deno_ast::parse_program(deno_ast::ParseParams {
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specifier: specifier.to_string(),
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text_info: text_info.clone(),
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media_type: deno_ast::MediaType::from_specifier(specifier),
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capture_tokens: true,
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scope_analysis: true,
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maybe_syntax: None,
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})?;
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let top_level_decls = analyze_top_level_decls(&parsed_source)?;
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analysis_cache.set_esm_analysis(
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specifier.as_str(),
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&source_hash,
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&top_level_decls.clone().into_iter().collect(),
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);
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top_level_decls
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};
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Ok(esm_code_from_top_level_decls(
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text_info.text_str(),
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&top_level_decls,
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))
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}
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fn esm_code_from_top_level_decls(
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file_text: &str,
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top_level_decls: &HashSet<String>,
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) -> String {
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let mut globals = Vec::with_capacity(NODE_GLOBALS.len());
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let has_global_this = top_level_decls.contains("globalThis");
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for global in NODE_GLOBALS.iter() {
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if !top_level_decls.contains(&global.to_string()) {
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globals.push(*global);
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}
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}
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let mut result = String::new();
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let global_this_expr = NODE_GLOBAL_THIS_NAME.as_str();
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let global_this_expr = if has_global_this {
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global_this_expr
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} else {
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write!(result, "var globalThis = {global_this_expr};").unwrap();
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"globalThis"
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};
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for global in globals {
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write!(result, "var {global} = {global_this_expr}.{global};").unwrap();
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}
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// strip the shebang
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let file_text = if file_text.starts_with("#!/") {
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let start_index = file_text.find('\n').unwrap_or(file_text.len());
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&file_text[start_index..]
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} else {
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file_text
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};
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result.push_str(file_text);
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result
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}
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fn analyze_top_level_decls(
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parsed_source: &ParsedSource,
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) -> Result<HashSet<String>, AnyError> {
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fn visit_children(
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node: Node,
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top_level_context: SyntaxContext,
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results: &mut HashSet<String>,
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) {
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if let Node::Ident(ident) = node {
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if ident.ctxt() == top_level_context && is_local_declaration_ident(node) {
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results.insert(ident.sym().to_string());
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}
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}
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for child in node.children() {
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visit_children(child, top_level_context, results);
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}
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}
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let top_level_context = parsed_source.top_level_context();
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parsed_source.with_view(|program| {
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let mut results = HashSet::new();
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visit_children(program.into(), top_level_context, &mut results);
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Ok(results)
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})
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}
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fn is_local_declaration_ident(node: Node) -> bool {
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if let Some(parent) = node.parent() {
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match parent {
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Node::BindingIdent(decl) => decl.id.range().contains(&node.range()),
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Node::ClassDecl(decl) => decl.ident.range().contains(&node.range()),
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Node::ClassExpr(decl) => decl
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.ident
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.as_ref()
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.map(|i| i.range().contains(&node.range()))
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.unwrap_or(false),
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Node::TsInterfaceDecl(decl) => decl.id.range().contains(&node.range()),
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Node::FnDecl(decl) => decl.ident.range().contains(&node.range()),
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Node::FnExpr(decl) => decl
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.ident
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.as_ref()
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.map(|i| i.range().contains(&node.range()))
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.unwrap_or(false),
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Node::TsModuleDecl(decl) => decl.id.range().contains(&node.range()),
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Node::TsNamespaceDecl(decl) => decl.id.range().contains(&node.range()),
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Node::VarDeclarator(decl) => decl.name.range().contains(&node.range()),
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Node::ImportNamedSpecifier(decl) => {
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decl.local.range().contains(&node.range())
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}
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Node::ImportDefaultSpecifier(decl) => {
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decl.local.range().contains(&node.range())
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}
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Node::ImportStarAsSpecifier(decl) => decl.range().contains(&node.range()),
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Node::KeyValuePatProp(decl) => decl.key.range().contains(&node.range()),
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Node::AssignPatProp(decl) => decl.key.range().contains(&node.range()),
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_ => false,
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}
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} else {
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false
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}
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}
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static RESERVED_WORDS: Lazy<HashSet<&str>> = Lazy::new(|| {
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HashSet::from([
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"break",
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"case",
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"catch",
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"class",
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"const",
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"continue",
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"debugger",
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"default",
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"delete",
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"do",
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"else",
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"export",
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"extends",
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"false",
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"finally",
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"for",
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"function",
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"if",
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"import",
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"in",
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"instanceof",
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"new",
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"null",
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"return",
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"super",
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"switch",
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"this",
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"throw",
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"true",
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"try",
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"typeof",
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"var",
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"void",
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"while",
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"with",
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"yield",
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"let",
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"enum",
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"implements",
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"interface",
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"package",
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"private",
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"protected",
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"public",
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"static",
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])
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});
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fn add_export(
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source: &mut Vec<String>,
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name: &str,
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initializer: &str,
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temp_var_count: &mut usize,
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) {
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fn is_valid_var_decl(name: &str) -> bool {
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// it's ok to be super strict here
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name
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.chars()
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.all(|c| c.is_ascii_alphanumeric() || c == '_' || c == '$')
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}
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// TODO(bartlomieju): Node actually checks if a given export exists in `exports` object,
|
|
// but it might not be necessary here since our analysis is more detailed?
|
|
if RESERVED_WORDS.contains(name) || !is_valid_var_decl(name) {
|
|
*temp_var_count += 1;
|
|
// we can't create an identifier with a reserved word or invalid identifier name,
|
|
// so assign it to a temporary variable that won't have a conflict, then re-export
|
|
// it as a string
|
|
source.push(format!(
|
|
"const __deno_export_{temp_var_count}__ = {initializer};"
|
|
));
|
|
source.push(format!(
|
|
"export {{ __deno_export_{temp_var_count}__ as \"{name}\" }};"
|
|
));
|
|
} else {
|
|
source.push(format!("export const {name} = {initializer};"));
|
|
}
|
|
}
|
|
|
|
fn parse_specifier(specifier: &str) -> Option<(String, String)> {
|
|
let mut separator_index = specifier.find('/');
|
|
let mut valid_package_name = true;
|
|
// let mut is_scoped = false;
|
|
if specifier.is_empty() {
|
|
valid_package_name = false;
|
|
} else if specifier.starts_with('@') {
|
|
// is_scoped = true;
|
|
if let Some(index) = separator_index {
|
|
separator_index = specifier[index + 1..].find('/').map(|i| i + index + 1);
|
|
} else {
|
|
valid_package_name = false;
|
|
}
|
|
}
|
|
|
|
let package_name = if let Some(index) = separator_index {
|
|
specifier[0..index].to_string()
|
|
} else {
|
|
specifier.to_string()
|
|
};
|
|
|
|
// Package name cannot have leading . and cannot have percent-encoding or separators.
|
|
for ch in package_name.chars() {
|
|
if ch == '%' || ch == '\\' {
|
|
valid_package_name = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if !valid_package_name {
|
|
return None;
|
|
}
|
|
|
|
let package_subpath = if let Some(index) = separator_index {
|
|
format!(".{}", specifier.chars().skip(index).collect::<String>())
|
|
} else {
|
|
".".to_string()
|
|
};
|
|
|
|
Some((package_name, package_subpath))
|
|
}
|
|
|
|
fn file_extension_probe(
|
|
p: PathBuf,
|
|
referrer: &Path,
|
|
) -> Result<PathBuf, AnyError> {
|
|
let p = p.clean();
|
|
if p.exists() {
|
|
let file_name = p.file_name().unwrap();
|
|
let p_js = p.with_file_name(format!("{}.js", file_name.to_str().unwrap()));
|
|
if p_js.exists() && p_js.is_file() {
|
|
return Ok(p_js);
|
|
} else if p.is_dir() {
|
|
return Ok(p.join("index.js"));
|
|
} else {
|
|
return Ok(p);
|
|
}
|
|
} else if let Some(file_name) = p.file_name() {
|
|
let p_js = p.with_file_name(format!("{}.js", file_name.to_str().unwrap()));
|
|
if p_js.exists() && p_js.is_file() {
|
|
return Ok(p_js);
|
|
}
|
|
}
|
|
Err(not_found(&p.to_string_lossy(), referrer))
|
|
}
|
|
|
|
fn not_found(path: &str, referrer: &Path) -> AnyError {
|
|
let msg = format!(
|
|
"[ERR_MODULE_NOT_FOUND] Cannot find module \"{}\" imported from \"{}\"",
|
|
path,
|
|
referrer.to_string_lossy()
|
|
);
|
|
std::io::Error::new(std::io::ErrorKind::NotFound, msg).into()
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_esm_code_with_node_globals() {
|
|
let r = esm_code_with_node_globals(
|
|
&NodeAnalysisCache::new_in_memory(),
|
|
&ModuleSpecifier::parse("https://example.com/foo/bar.js").unwrap(),
|
|
"export const x = 1;".to_string(),
|
|
)
|
|
.unwrap();
|
|
assert!(r.contains(&format!(
|
|
"var globalThis = {};",
|
|
NODE_GLOBAL_THIS_NAME.as_str()
|
|
)));
|
|
assert!(r.contains("var process = globalThis.process;"));
|
|
assert!(r.contains("export const x = 1;"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_esm_code_with_node_globals_with_shebang() {
|
|
let r = esm_code_with_node_globals(
|
|
&NodeAnalysisCache::new_in_memory(),
|
|
&ModuleSpecifier::parse("https://example.com/foo/bar.js").unwrap(),
|
|
"#!/usr/bin/env node\nexport const x = 1;".to_string(),
|
|
)
|
|
.unwrap();
|
|
assert_eq!(
|
|
r,
|
|
format!(
|
|
concat!(
|
|
"var globalThis = {}",
|
|
";var Buffer = globalThis.Buffer;",
|
|
"var clearImmediate = globalThis.clearImmediate;var clearInterval = globalThis.clearInterval;",
|
|
"var clearTimeout = globalThis.clearTimeout;var console = globalThis.console;",
|
|
"var global = globalThis.global;var process = globalThis.process;",
|
|
"var setImmediate = globalThis.setImmediate;var setInterval = globalThis.setInterval;",
|
|
"var setTimeout = globalThis.setTimeout;\n",
|
|
"export const x = 1;"
|
|
),
|
|
NODE_GLOBAL_THIS_NAME.as_str(),
|
|
)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_add_export() {
|
|
let mut temp_var_count = 0;
|
|
let mut source = vec![];
|
|
|
|
let exports = vec!["static", "server", "app", "dashed-export"];
|
|
for export in exports {
|
|
add_export(&mut source, export, "init", &mut temp_var_count);
|
|
}
|
|
assert_eq!(
|
|
source,
|
|
vec![
|
|
"const __deno_export_1__ = init;".to_string(),
|
|
"export { __deno_export_1__ as \"static\" };".to_string(),
|
|
"export const server = init;".to_string(),
|
|
"export const app = init;".to_string(),
|
|
"const __deno_export_2__ = init;".to_string(),
|
|
"export { __deno_export_2__ as \"dashed-export\" };".to_string(),
|
|
]
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_specifier() {
|
|
assert_eq!(
|
|
parse_specifier("@some-package/core/actions"),
|
|
Some(("@some-package/core".to_string(), "./actions".to_string()))
|
|
);
|
|
}
|
|
}
|