mirror of
https://github.com/denoland/deno.git
synced 2024-11-23 15:16:54 -05:00
711 lines
20 KiB
Rust
711 lines
20 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use crate::media_type::MediaType;
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use crate::tsc_config;
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use deno_core::error::AnyError;
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use deno_core::serde_json;
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use deno_core::ModuleSpecifier;
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use std::error::Error;
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use std::fmt;
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use std::ops::Range;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::sync::RwLock;
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use swc_common::chain;
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use swc_common::comments::Comment;
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use swc_common::comments::CommentKind;
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use swc_common::comments::SingleThreadedComments;
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use swc_common::errors::Diagnostic;
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use swc_common::errors::DiagnosticBuilder;
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use swc_common::errors::Emitter;
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use swc_common::errors::Handler;
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use swc_common::errors::HandlerFlags;
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use swc_common::FileName;
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use swc_common::Globals;
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use swc_common::Loc;
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use swc_common::SourceFile;
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use swc_common::SourceMap;
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use swc_common::Span;
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use swc_ecmascript::ast::Module;
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use swc_ecmascript::ast::Program;
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use swc_ecmascript::codegen::text_writer::JsWriter;
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use swc_ecmascript::codegen::Node;
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use swc_ecmascript::dep_graph::analyze_dependencies;
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use swc_ecmascript::dep_graph::DependencyDescriptor;
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use swc_ecmascript::parser::lexer::Lexer;
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use swc_ecmascript::parser::token::Token;
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use swc_ecmascript::parser::EsConfig;
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use swc_ecmascript::parser::JscTarget;
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use swc_ecmascript::parser::StringInput;
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use swc_ecmascript::parser::Syntax;
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use swc_ecmascript::parser::TsConfig;
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use swc_ecmascript::transforms::fixer;
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use swc_ecmascript::transforms::helpers;
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use swc_ecmascript::transforms::hygiene;
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use swc_ecmascript::transforms::pass::Optional;
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use swc_ecmascript::transforms::proposals;
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use swc_ecmascript::transforms::react;
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use swc_ecmascript::transforms::typescript;
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use swc_ecmascript::visit::FoldWith;
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static TARGET: JscTarget = JscTarget::Es2020;
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct Location {
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pub filename: String,
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pub line: usize,
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pub col: usize,
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}
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impl Into<Location> for swc_common::Loc {
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fn into(self) -> Location {
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use swc_common::FileName::*;
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let filename = match &self.file.name {
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Real(path_buf) => path_buf.to_string_lossy().to_string(),
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Custom(str_) => str_.to_string(),
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_ => panic!("invalid filename"),
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};
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Location {
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filename,
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line: self.line,
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col: self.col_display,
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}
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}
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}
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impl Into<ModuleSpecifier> for Location {
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fn into(self) -> ModuleSpecifier {
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ModuleSpecifier::resolve_url_or_path(&self.filename).unwrap()
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}
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}
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impl std::fmt::Display for Location {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "{}:{}:{}", self.filename, self.line, self.col)
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}
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}
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/// A buffer for collecting diagnostic messages from the AST parser.
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#[derive(Debug)]
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pub struct DiagnosticBuffer(Vec<String>);
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impl Error for DiagnosticBuffer {}
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impl fmt::Display for DiagnosticBuffer {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let s = self.0.join(",");
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f.pad(&s)
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}
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}
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impl DiagnosticBuffer {
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pub fn from_error_buffer<F>(error_buffer: ErrorBuffer, get_loc: F) -> Self
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where
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F: Fn(Span) -> Loc,
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{
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let s = error_buffer.0.read().unwrap().clone();
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let diagnostics = s
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.iter()
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.map(|d| {
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let mut msg = d.message();
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if let Some(span) = d.span.primary_span() {
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let loc = get_loc(span);
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let file_name = match &loc.file.name {
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FileName::Custom(n) => n,
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_ => unreachable!(),
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};
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msg = format!(
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"{} at {}:{}:{}",
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msg, file_name, loc.line, loc.col_display
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);
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}
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msg
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})
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.collect::<Vec<String>>();
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Self(diagnostics)
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}
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}
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/// A buffer for collecting errors from the AST parser.
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#[derive(Debug, Clone)]
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pub struct ErrorBuffer(Arc<RwLock<Vec<Diagnostic>>>);
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impl ErrorBuffer {
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pub fn new() -> Self {
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Self(Arc::new(RwLock::new(Vec::new())))
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}
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}
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impl Emitter for ErrorBuffer {
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fn emit(&mut self, db: &DiagnosticBuilder) {
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self.0.write().unwrap().push((**db).clone());
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}
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}
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fn get_es_config(jsx: bool) -> EsConfig {
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EsConfig {
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class_private_methods: true,
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class_private_props: true,
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class_props: true,
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dynamic_import: true,
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export_default_from: true,
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export_namespace_from: true,
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import_meta: true,
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jsx,
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nullish_coalescing: true,
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num_sep: true,
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optional_chaining: true,
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top_level_await: true,
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..EsConfig::default()
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}
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}
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fn get_ts_config(tsx: bool, dts: bool) -> TsConfig {
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TsConfig {
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decorators: true,
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dts,
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dynamic_import: true,
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tsx,
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..TsConfig::default()
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}
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}
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pub fn get_syntax(media_type: &MediaType) -> Syntax {
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match media_type {
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MediaType::JavaScript => Syntax::Es(get_es_config(false)),
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MediaType::JSX => Syntax::Es(get_es_config(true)),
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MediaType::TypeScript => Syntax::Typescript(get_ts_config(false, false)),
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MediaType::Dts => Syntax::Typescript(get_ts_config(false, true)),
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MediaType::TSX => Syntax::Typescript(get_ts_config(true, false)),
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_ => Syntax::Es(get_es_config(false)),
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}
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}
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/// Options which can be adjusted when transpiling a module.
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#[derive(Debug, Clone)]
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pub struct EmitOptions {
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/// Indicate if JavaScript is being checked/transformed as well, or if it is
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/// only TypeScript.
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pub check_js: bool,
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/// When emitting a legacy decorator, also emit experimental decorator meta
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/// data. Defaults to `false`.
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pub emit_metadata: bool,
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/// Should the source map be inlined in the emitted code file, or provided
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/// as a separate file. Defaults to `true`.
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pub inline_source_map: bool,
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/// When transforming JSX, what value should be used for the JSX factory.
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/// Defaults to `React.createElement`.
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pub jsx_factory: String,
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/// When transforming JSX, what value should be used for the JSX fragment
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/// factory. Defaults to `React.Fragment`.
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pub jsx_fragment_factory: String,
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/// Should JSX be transformed or preserved. Defaults to `true`.
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pub transform_jsx: bool,
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}
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impl Default for EmitOptions {
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fn default() -> Self {
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EmitOptions {
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check_js: false,
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emit_metadata: false,
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inline_source_map: true,
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jsx_factory: "React.createElement".into(),
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jsx_fragment_factory: "React.Fragment".into(),
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transform_jsx: true,
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}
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}
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}
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impl From<tsc_config::TsConfig> for EmitOptions {
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fn from(config: tsc_config::TsConfig) -> Self {
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let options: tsc_config::EmitConfigOptions =
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serde_json::from_value(config.0).unwrap();
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EmitOptions {
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check_js: options.check_js,
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emit_metadata: options.emit_decorator_metadata,
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inline_source_map: options.inline_source_map,
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jsx_factory: options.jsx_factory,
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jsx_fragment_factory: options.jsx_fragment_factory,
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transform_jsx: options.jsx == "react",
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}
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}
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}
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/// A logical structure to hold the value of a parsed module for further
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/// processing.
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#[derive(Clone)]
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pub struct ParsedModule {
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comments: SingleThreadedComments,
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leading_comments: Vec<Comment>,
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module: Module,
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source_map: Rc<SourceMap>,
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source_file: Rc<SourceFile>,
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}
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impl fmt::Debug for ParsedModule {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("ParsedModule")
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.field("comments", &self.comments)
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.field("leading_comments", &self.leading_comments)
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.field("module", &self.module)
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.finish()
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}
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}
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impl ParsedModule {
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/// Return a vector of dependencies for the module.
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pub fn analyze_dependencies(&self) -> Vec<DependencyDescriptor> {
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analyze_dependencies(&self.module, &self.source_map, &self.comments)
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}
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/// Get the module's leading comments, where triple slash directives might
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/// be located.
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pub fn get_leading_comments(&self) -> Vec<Comment> {
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self.leading_comments.clone()
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}
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/// Get a location for a given span within the module.
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pub fn get_location(&self, span: &Span) -> Location {
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self.source_map.lookup_char_pos(span.lo).into()
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}
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/// Transform a TypeScript file into a JavaScript file, based on the supplied
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/// options.
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///
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/// The result is a tuple of the code and optional source map as strings.
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pub fn transpile(
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self,
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options: &EmitOptions,
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) -> Result<(String, Option<String>), AnyError> {
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let program = Program::Module(self.module);
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let jsx_pass = react::react(
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self.source_map.clone(),
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Some(&self.comments),
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react::Options {
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pragma: options.jsx_factory.clone(),
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pragma_frag: options.jsx_fragment_factory.clone(),
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// this will use `Object.assign()` instead of the `_extends` helper
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// when spreading props.
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use_builtins: true,
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..Default::default()
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},
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);
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let mut passes = chain!(
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Optional::new(jsx_pass, options.transform_jsx),
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proposals::decorators::decorators(proposals::decorators::Config {
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legacy: true,
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emit_metadata: options.emit_metadata
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}),
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helpers::inject_helpers(),
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typescript::strip(),
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fixer(Some(&self.comments)),
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hygiene(),
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);
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let program = swc_common::GLOBALS.set(&Globals::new(), || {
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helpers::HELPERS.set(&helpers::Helpers::new(false), || {
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program.fold_with(&mut passes)
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})
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});
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let mut src_map_buf = vec![];
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let mut buf = vec![];
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{
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let writer = Box::new(JsWriter::new(
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self.source_map.clone(),
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"\n",
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&mut buf,
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Some(&mut src_map_buf),
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));
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let config = swc_ecmascript::codegen::Config { minify: false };
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let mut emitter = swc_ecmascript::codegen::Emitter {
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cfg: config,
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comments: Some(&self.comments),
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cm: self.source_map.clone(),
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wr: writer,
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};
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program.emit_with(&mut emitter)?;
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}
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let mut src = String::from_utf8(buf)?;
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let mut map: Option<String> = None;
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{
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let mut buf = Vec::new();
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self
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.source_map
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.build_source_map_from(&mut src_map_buf, None)
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.to_writer(&mut buf)?;
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if options.inline_source_map {
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src.push_str("//# sourceMappingURL=data:application/json;base64,");
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let encoded_map = base64::encode(buf);
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src.push_str(&encoded_map);
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} else {
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map = Some(String::from_utf8(buf)?);
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}
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}
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Ok((src, map))
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}
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}
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fn parse_with_source_map(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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source_map: Rc<SourceMap>,
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) -> Result<ParsedModule, AnyError> {
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let source_file = source_map.new_source_file(
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FileName::Custom(specifier.to_string()),
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source.to_string(),
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);
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let error_buffer = ErrorBuffer::new();
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let syntax = get_syntax(media_type);
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let input = StringInput::from(&*source_file);
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let comments = SingleThreadedComments::default();
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let handler = Handler::with_emitter_and_flags(
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Box::new(error_buffer.clone()),
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HandlerFlags {
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can_emit_warnings: true,
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dont_buffer_diagnostics: true,
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..HandlerFlags::default()
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},
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);
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let lexer = Lexer::new(syntax, TARGET, input, Some(&comments));
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let mut parser = swc_ecmascript::parser::Parser::new_from(lexer);
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let sm = &source_map;
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let module = parser.parse_module().map_err(move |err| {
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let mut diagnostic = err.into_diagnostic(&handler);
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diagnostic.emit();
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DiagnosticBuffer::from_error_buffer(error_buffer, |span| {
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sm.lookup_char_pos(span.lo)
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})
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})?;
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let leading_comments =
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comments.with_leading(module.span.lo, |comments| comments.to_vec());
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Ok(ParsedModule {
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leading_comments,
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module,
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source_map,
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comments,
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source_file,
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})
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}
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/// For a given specifier, source, and media type, parse the source of the
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/// module and return a representation which can be further processed.
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///
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/// # Arguments
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///
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/// - `specifier` - The module specifier for the module.
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/// - `source` - The source code for the module.
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/// - `media_type` - The media type for the module.
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///
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// NOTE(bartlomieju): `specifier` has `&str` type instead of
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// `&ModuleSpecifier` because runtime compiler APIs don't
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// require valid module specifiers
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pub fn parse(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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) -> Result<ParsedModule, AnyError> {
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let source_map = Rc::new(SourceMap::default());
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parse_with_source_map(specifier, source, media_type, source_map)
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}
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pub enum TokenOrComment {
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Token(Token),
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Comment { kind: CommentKind, text: String },
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}
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pub struct LexedItem {
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pub span: Span,
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pub inner: TokenOrComment,
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}
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impl LexedItem {
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pub fn span_as_range(&self) -> Range<usize> {
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self.span.lo.0 as usize..self.span.hi.0 as usize
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}
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}
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fn flatten_comments(
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comments: SingleThreadedComments,
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) -> impl Iterator<Item = Comment> {
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let (leading, trailing) = comments.take_all();
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let mut comments = (*leading).clone().into_inner();
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comments.extend((*trailing).clone().into_inner());
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comments.into_iter().flat_map(|el| el.1)
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}
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pub fn lex(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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) -> Vec<LexedItem> {
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let source_map = SourceMap::default();
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let source_file = source_map.new_source_file(
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FileName::Custom(specifier.to_string()),
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source.to_string(),
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);
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let comments = SingleThreadedComments::default();
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let lexer = Lexer::new(
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get_syntax(media_type),
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TARGET,
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StringInput::from(source_file.as_ref()),
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Some(&comments),
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);
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let mut tokens: Vec<LexedItem> = lexer
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.map(|token| LexedItem {
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span: token.span,
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inner: TokenOrComment::Token(token.token),
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})
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.collect();
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tokens.extend(flatten_comments(comments).map(|comment| LexedItem {
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span: comment.span,
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inner: TokenOrComment::Comment {
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kind: comment.kind,
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text: comment.text,
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},
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}));
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tokens.sort_by_key(|item| item.span.lo.0);
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tokens
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}
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/// A low level function which transpiles a source module into an swc
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/// SourceFile.
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pub fn transpile_module(
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filename: &str,
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src: &str,
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media_type: &MediaType,
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emit_options: &EmitOptions,
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globals: &Globals,
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cm: Rc<SourceMap>,
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) -> Result<(Rc<SourceFile>, Module), AnyError> {
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let parsed_module =
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parse_with_source_map(filename, src, media_type, cm.clone())?;
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let jsx_pass = react::react(
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cm,
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Some(&parsed_module.comments),
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react::Options {
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pragma: emit_options.jsx_factory.clone(),
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pragma_frag: emit_options.jsx_fragment_factory.clone(),
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// this will use `Object.assign()` instead of the `_extends` helper
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// when spreading props.
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use_builtins: true,
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..Default::default()
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},
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);
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let mut passes = chain!(
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Optional::new(jsx_pass, emit_options.transform_jsx),
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proposals::decorators::decorators(proposals::decorators::Config {
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legacy: true,
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emit_metadata: emit_options.emit_metadata
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}),
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helpers::inject_helpers(),
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typescript::strip(),
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fixer(Some(&parsed_module.comments)),
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);
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|
|
let source_file = parsed_module.source_file.clone();
|
|
let module = parsed_module.module;
|
|
|
|
let module = swc_common::GLOBALS.set(globals, || {
|
|
helpers::HELPERS.set(&helpers::Helpers::new(false), || {
|
|
module.fold_with(&mut passes)
|
|
})
|
|
});
|
|
|
|
Ok((source_file, module))
|
|
}
|
|
|
|
pub struct BundleHook;
|
|
|
|
impl swc_bundler::Hook for BundleHook {
|
|
fn get_import_meta_props(
|
|
&self,
|
|
span: swc_common::Span,
|
|
module_record: &swc_bundler::ModuleRecord,
|
|
) -> Result<Vec<swc_ecmascript::ast::KeyValueProp>, AnyError> {
|
|
use swc_ecmascript::ast;
|
|
|
|
// we use custom file names, and swc "wraps" these in `<` and `>` so, we
|
|
// want to strip those back out.
|
|
let mut value = module_record.file_name.to_string();
|
|
value.pop();
|
|
value.remove(0);
|
|
|
|
Ok(vec![
|
|
ast::KeyValueProp {
|
|
key: ast::PropName::Ident(ast::Ident::new("url".into(), span)),
|
|
value: Box::new(ast::Expr::Lit(ast::Lit::Str(ast::Str {
|
|
span,
|
|
value: value.into(),
|
|
has_escape: false,
|
|
}))),
|
|
},
|
|
ast::KeyValueProp {
|
|
key: ast::PropName::Ident(ast::Ident::new("main".into(), span)),
|
|
value: Box::new(if module_record.is_entry {
|
|
ast::Expr::Member(ast::MemberExpr {
|
|
span,
|
|
obj: ast::ExprOrSuper::Expr(Box::new(ast::Expr::MetaProp(
|
|
ast::MetaPropExpr {
|
|
meta: ast::Ident::new("import".into(), span),
|
|
prop: ast::Ident::new("meta".into(), span),
|
|
},
|
|
))),
|
|
prop: Box::new(ast::Expr::Ident(ast::Ident::new(
|
|
"main".into(),
|
|
span,
|
|
))),
|
|
computed: false,
|
|
})
|
|
} else {
|
|
ast::Expr::Lit(ast::Lit::Bool(ast::Bool { span, value: false }))
|
|
}),
|
|
},
|
|
])
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use swc_ecmascript::dep_graph::DependencyKind;
|
|
|
|
#[test]
|
|
fn test_parsed_module_analyze_dependencies() {
|
|
let specifier =
|
|
ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.js")
|
|
.unwrap();
|
|
let source = r#"import * as bar from "./test.ts";
|
|
const foo = await import("./foo.ts");
|
|
"#;
|
|
let parsed_module =
|
|
parse(specifier.as_str(), source, &MediaType::JavaScript)
|
|
.expect("could not parse module");
|
|
let actual = parsed_module.analyze_dependencies();
|
|
assert_eq!(
|
|
actual,
|
|
vec![
|
|
DependencyDescriptor {
|
|
kind: DependencyKind::Import,
|
|
is_dynamic: false,
|
|
leading_comments: Vec::new(),
|
|
col: 0,
|
|
line: 1,
|
|
specifier: "./test.ts".into()
|
|
},
|
|
DependencyDescriptor {
|
|
kind: DependencyKind::Import,
|
|
is_dynamic: true,
|
|
leading_comments: Vec::new(),
|
|
col: 22,
|
|
line: 2,
|
|
specifier: "./foo.ts".into()
|
|
}
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile() {
|
|
let specifier =
|
|
ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
enum D {
|
|
A,
|
|
B,
|
|
C,
|
|
}
|
|
|
|
export class A {
|
|
private b: string;
|
|
protected c: number = 1;
|
|
e: "foo";
|
|
constructor (public d = D.A) {
|
|
const e = "foo" as const;
|
|
this.e = e;
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
|
|
.expect("could not parse module");
|
|
let (code, maybe_map) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.starts_with("var D;\n(function(D) {\n"));
|
|
assert!(
|
|
code.contains("\n//# sourceMappingURL=data:application/json;base64,")
|
|
);
|
|
assert!(maybe_map.is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile_tsx() {
|
|
let specifier =
|
|
ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
export class A {
|
|
render() {
|
|
return <div><span></span></div>
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::TSX)
|
|
.expect("could not parse module");
|
|
let (code, _) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.contains("React.createElement(\"div\", null"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile_decorators() {
|
|
let specifier =
|
|
ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
function enumerable(value: boolean) {
|
|
return function (
|
|
_target: any,
|
|
_propertyKey: string,
|
|
descriptor: PropertyDescriptor,
|
|
) {
|
|
descriptor.enumerable = value;
|
|
};
|
|
}
|
|
|
|
export class A {
|
|
@enumerable(false)
|
|
a() {
|
|
Test.value;
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
|
|
.expect("could not parse module");
|
|
let (code, _) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.contains("_applyDecoratedDescriptor("));
|
|
}
|
|
}
|