mirror of
https://github.com/denoland/deno.git
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723 lines
21 KiB
Rust
723 lines
21 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use crate::config_file;
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use crate::media_type::MediaType;
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use deno_core::error::AnyError;
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use deno_core::resolve_url_or_path;
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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 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::FileName;
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use swc_common::Globals;
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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_common::Spanned;
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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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mod transforms;
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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 From<swc_common::Loc> for Location {
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fn from(swc_loc: swc_common::Loc) -> Self {
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use swc_common::FileName::*;
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let filename = match &swc_loc.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: swc_loc.line,
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col: swc_loc.col_display,
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}
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}
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}
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impl From<Location> for ModuleSpecifier {
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fn from(loc: Location) -> Self {
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resolve_url_or_path(&loc.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 diagnostic from the AST parser.
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct Diagnostic {
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pub location: Location,
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pub message: String,
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}
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impl Error for Diagnostic {}
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impl fmt::Display for Diagnostic {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{} at {}", self.message, self.location)
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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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#[derive(Debug, Clone)]
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pub enum ImportsNotUsedAsValues {
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Remove,
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Preserve,
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Error,
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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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/// 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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/// What to do with import statements that only import types i.e. whether to
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/// remove them (`Remove`), keep them as side-effect imports (`Preserve`)
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/// or error (`Error`). Defaults to `Remove`.
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pub imports_not_used_as_values: ImportsNotUsedAsValues,
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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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// Should a corresponding .map file be created for the output. This should be
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// false if inline_source_map is true. Defaults to `false`.
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pub 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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/// Should import declarations be transformed to variable declarations.
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/// This should only be set to true for the REPL. Defaults to `false`.
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pub repl_imports: 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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emit_metadata: false,
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imports_not_used_as_values: ImportsNotUsedAsValues::Remove,
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inline_source_map: true,
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source_map: false,
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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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repl_imports: false,
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}
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}
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}
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impl From<config_file::TsConfig> for EmitOptions {
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fn from(config: config_file::TsConfig) -> Self {
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let options: config_file::EmitConfigOptions =
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serde_json::from_value(config.0).unwrap();
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let imports_not_used_as_values =
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match options.imports_not_used_as_values.as_str() {
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"preserve" => ImportsNotUsedAsValues::Preserve,
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"error" => ImportsNotUsedAsValues::Error,
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_ => ImportsNotUsedAsValues::Remove,
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};
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EmitOptions {
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emit_metadata: options.emit_decorator_metadata,
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imports_not_used_as_values,
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inline_source_map: options.inline_source_map,
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source_map: options.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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repl_imports: false,
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}
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}
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}
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fn strip_config_from_emit_options(
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options: &EmitOptions,
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) -> typescript::strip::Config {
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typescript::strip::Config {
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import_not_used_as_values: match options.imports_not_used_as_values {
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ImportsNotUsedAsValues::Remove => {
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typescript::strip::ImportsNotUsedAsValues::Remove
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}
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ImportsNotUsedAsValues::Preserve => {
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typescript::strip::ImportsNotUsedAsValues::Preserve
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}
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// `Error` only affects the type-checking stage. Fall back to `Remove` here.
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ImportsNotUsedAsValues::Error => {
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typescript::strip::ImportsNotUsedAsValues::Remove
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}
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},
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use_define_for_class_fields: true,
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// TODO(bartlomieju): this could be changed to `false` to provide `export {}`
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// in Typescript files without manual changes
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no_empty_export: true,
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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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pub module: Module,
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pub 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.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 the module's comments.
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pub fn get_comments(&self) -> Vec<Comment> {
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let mut comments = Vec::new();
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let (leading_comments, trailing_comments) = self.comments.borrow_all();
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for value in leading_comments.values() {
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comments.append(&mut value.clone());
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}
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for value in trailing_comments.values() {
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comments.append(&mut value.clone());
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}
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comments
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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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Optional::new(transforms::DownlevelImportsFolder, options.repl_imports),
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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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// DownlevelImportsFolder::new(), // todo: make this conditional
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helpers::inject_helpers(),
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typescript::strip::strip_with_config(strip_config_from_emit_options(
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options
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)),
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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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pub 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 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 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| Diagnostic {
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location: sm.lookup_char_pos(err.span().lo).into(),
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message: err.into_kind().msg().to_string(),
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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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comments,
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leading_comments,
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module,
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source_map,
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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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|
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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
|
|
// when spreading props.
|
|
use_builtins: true,
|
|
..Default::default()
|
|
},
|
|
);
|
|
let mut passes = chain!(
|
|
Optional::new(jsx_pass, emit_options.transform_jsx),
|
|
proposals::decorators::decorators(proposals::decorators::Config {
|
|
legacy: true,
|
|
emit_metadata: emit_options.emit_metadata
|
|
}),
|
|
helpers::inject_helpers(),
|
|
typescript::strip::strip_with_config(strip_config_from_emit_options(
|
|
emit_options
|
|
)),
|
|
fixer(Some(&parsed_module.comments)),
|
|
);
|
|
|
|
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(),
|
|
kind: ast::StrKind::Synthesized,
|
|
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 std::collections::HashMap;
|
|
use swc_common::BytePos;
|
|
use swc_ecmascript::dep_graph::DependencyKind;
|
|
|
|
#[test]
|
|
fn test_parsed_module_analyze_dependencies() {
|
|
let specifier = resolve_url_or_path("https://deno.land/x/mod.js").unwrap();
|
|
let source = "import * as bar from './test.ts';\nconst 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(),
|
|
span: Span::new(BytePos(0), BytePos(33), Default::default()),
|
|
specifier: "./test.ts".into(),
|
|
specifier_span: Span::new(
|
|
BytePos(21),
|
|
BytePos(32),
|
|
Default::default()
|
|
),
|
|
import_assertions: HashMap::default(),
|
|
},
|
|
DependencyDescriptor {
|
|
kind: DependencyKind::Import,
|
|
is_dynamic: true,
|
|
leading_comments: Vec::new(),
|
|
span: Span::new(BytePos(52), BytePos(70), Default::default()),
|
|
specifier: "./foo.ts".into(),
|
|
specifier_span: Span::new(
|
|
BytePos(59),
|
|
BytePos(69),
|
|
Default::default()
|
|
),
|
|
import_assertions: HashMap::default(),
|
|
}
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile() {
|
|
let specifier = 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 = 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 = 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("));
|
|
}
|
|
}
|