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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use std::collections::HashSet;
use deno_ast::swc::common::SyntaxContext;
use deno_ast::view::Node;
use deno_ast::view::NodeTrait;
use deno_ast::CjsAnalysis;
use deno_ast::MediaType;
use deno_ast::ModuleSpecifier;
use deno_ast::ParsedSource;
use deno_ast::SourceRanged;
use deno_core::error::AnyError;
use deno_runtime::deno_node::analyze::CjsAnalysis as ExtNodeCjsAnalysis;
use deno_runtime::deno_node::analyze::CjsEsmCodeAnalyzer;
use crate::cache::NodeAnalysisCache;
pub struct CliCjsEsmCodeAnalyzer {
cache: NodeAnalysisCache,
}
impl CliCjsEsmCodeAnalyzer {
pub fn new(cache: NodeAnalysisCache) -> Self {
Self { cache }
}
fn inner_cjs_analysis(
&self,
specifier: &ModuleSpecifier,
source: &str,
) -> Result<CjsAnalysis, AnyError> {
let source_hash = NodeAnalysisCache::compute_source_hash(source);
if let Some(analysis) = self
.cache
.get_cjs_analysis(specifier.as_str(), &source_hash)
{
return Ok(analysis);
}
let media_type = MediaType::from_specifier(specifier);
if media_type == MediaType::Json {
return Ok(CjsAnalysis {
exports: vec![],
reexports: vec![],
});
}
let parsed_source = deno_ast::parse_script(deno_ast::ParseParams {
specifier: specifier.to_string(),
text_info: deno_ast::SourceTextInfo::new(source.into()),
media_type,
capture_tokens: true,
scope_analysis: false,
maybe_syntax: None,
})?;
let analysis = parsed_source.analyze_cjs();
self
.cache
.set_cjs_analysis(specifier.as_str(), &source_hash, &analysis);
Ok(analysis)
}
}
impl CjsEsmCodeAnalyzer for CliCjsEsmCodeAnalyzer {
fn analyze_cjs(
&self,
specifier: &ModuleSpecifier,
source: &str,
) -> Result<ExtNodeCjsAnalysis, AnyError> {
let analysis = self.inner_cjs_analysis(specifier, source)?;
Ok(ExtNodeCjsAnalysis {
exports: analysis.exports,
reexports: analysis.reexports,
})
}
fn analyze_esm_top_level_decls(
&self,
specifier: &ModuleSpecifier,
source: &str,
) -> Result<HashSet<String>, AnyError> {
// TODO(dsherret): this code is way more inefficient than it needs to be.
//
// In the future, we should disable capturing tokens & scope analysis
// and instead only use swc's APIs to go through the portions of the tree
// that we know will affect the global scope while still ensuring that
// `var` decls are taken into consideration.
let source_hash = NodeAnalysisCache::compute_source_hash(source);
if let Some(decls) = self
.cache
.get_esm_analysis(specifier.as_str(), &source_hash)
{
Ok(HashSet::from_iter(decls))
} else {
let parsed_source = deno_ast::parse_program(deno_ast::ParseParams {
specifier: specifier.to_string(),
text_info: deno_ast::SourceTextInfo::from_string(source.to_string()),
media_type: deno_ast::MediaType::from_specifier(specifier),
capture_tokens: true,
scope_analysis: true,
maybe_syntax: None,
})?;
let top_level_decls = analyze_top_level_decls(&parsed_source)?;
self.cache.set_esm_analysis(
specifier.as_str(),
&source_hash,
&top_level_decls.clone().into_iter().collect::<Vec<_>>(),
);
Ok(top_level_decls)
}
}
}
fn analyze_top_level_decls(
parsed_source: &ParsedSource,
) -> Result<HashSet<String>, AnyError> {
fn visit_children(
node: Node,
top_level_context: SyntaxContext,
results: &mut HashSet<String>,
) {
if let Node::Ident(ident) = node {
if ident.ctxt() == top_level_context && is_local_declaration_ident(node) {
results.insert(ident.sym().to_string());
}
}
for child in node.children() {
visit_children(child, top_level_context, results);
}
}
let top_level_context = parsed_source.top_level_context();
parsed_source.with_view(|program| {
let mut results = HashSet::new();
visit_children(program.into(), top_level_context, &mut results);
Ok(results)
})
}
fn is_local_declaration_ident(node: Node) -> bool {
if let Some(parent) = node.parent() {
match parent {
Node::BindingIdent(decl) => decl.id.range().contains(&node.range()),
Node::ClassDecl(decl) => decl.ident.range().contains(&node.range()),
Node::ClassExpr(decl) => decl
.ident
.as_ref()
.map(|i| i.range().contains(&node.range()))
.unwrap_or(false),
Node::TsInterfaceDecl(decl) => decl.id.range().contains(&node.range()),
Node::FnDecl(decl) => decl.ident.range().contains(&node.range()),
Node::FnExpr(decl) => decl
.ident
.as_ref()
.map(|i| i.range().contains(&node.range()))
.unwrap_or(false),
Node::TsModuleDecl(decl) => decl.id.range().contains(&node.range()),
Node::TsNamespaceDecl(decl) => decl.id.range().contains(&node.range()),
Node::VarDeclarator(decl) => decl.name.range().contains(&node.range()),
Node::ImportNamedSpecifier(decl) => {
decl.local.range().contains(&node.range())
}
Node::ImportDefaultSpecifier(decl) => {
decl.local.range().contains(&node.range())
}
Node::ImportStarAsSpecifier(decl) => decl.range().contains(&node.range()),
Node::KeyValuePatProp(decl) => decl.key.range().contains(&node.range()),
Node::AssignPatProp(decl) => decl.key.range().contains(&node.range()),
_ => false,
}
} else {
false
}
}
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