mirror of
https://github.com/denoland/deno.git
synced 2024-11-26 16:09:27 -05:00
509 lines
14 KiB
Rust
509 lines
14 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use crate::file_fetcher::TextDocument;
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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::ModuleSpecifier;
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use std::error::Error;
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use std::fmt;
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use std::rc::Rc;
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use std::result;
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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::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::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::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::pass::Optional;
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use swc_ecmascript::transforms::proposals::decorators;
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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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type Result<V> = result::Result<V, AnyError>;
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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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/// 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 TranspileOptions {
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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 TranspileOptions {
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fn default() -> Self {
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TranspileOptions {
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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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/// 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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}
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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: &TranspileOptions,
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) -> Result<(TextDocument, Option<TextDocument>)> {
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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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decorators::decorators(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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typescript::strip(),
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fixer(Some(&self.comments)),
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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<TextDocument> = 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(TextDocument::from(buf));
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}
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}
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Ok((src.into(), map))
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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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pub fn parse(
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specifier: &ModuleSpecifier,
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source: &str,
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media_type: &MediaType,
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) -> Result<ParsedModule> {
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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 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: Rc::new(source_map),
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comments,
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use swc_ecmascript::dep_graph::DependencyKind;
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#[test]
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fn test_parsed_module_analyze_dependencies() {
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let specifier =
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ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.js")
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.unwrap();
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let source = r#"import * as bar from "./test.ts";
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const foo = await import("./foo.ts");
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"#;
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let parsed_module = parse(&specifier, source, &MediaType::JavaScript)
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.expect("could not parse module");
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let actual = parsed_module.analyze_dependencies();
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assert_eq!(
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actual,
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vec![
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DependencyDescriptor {
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kind: DependencyKind::Import,
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is_dynamic: false,
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leading_comments: Vec::new(),
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col: 0,
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line: 1,
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specifier: "./test.ts".into()
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},
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DependencyDescriptor {
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kind: DependencyKind::Import,
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is_dynamic: true,
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leading_comments: Vec::new(),
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col: 22,
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line: 2,
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specifier: "./foo.ts".into()
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}
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]
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);
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}
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#[test]
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fn test_transpile() {
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let specifier =
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ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
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.expect("could not resolve specifier");
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let source = r#"
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enum D {
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A,
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B,
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C,
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}
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export class A {
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private b: string;
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protected c: number = 1;
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e: "foo";
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constructor (public d = D.A) {
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const e = "foo" as const;
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this.e = e;
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}
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}
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"#;
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let module = parse(&specifier, source, &MediaType::TypeScript)
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.expect("could not parse module");
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let (code, maybe_map) = module
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.transpile(&TranspileOptions::default())
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.expect("could not strip types");
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assert!(code
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.to_string()
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.unwrap()
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.starts_with("var D;\n(function(D) {\n"));
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assert!(code
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.to_string()
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.unwrap()
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.contains("\n//# sourceMappingURL=data:application/json;base64,"));
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assert!(maybe_map.is_none());
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}
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#[test]
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fn test_transpile_tsx() {
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let specifier =
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ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
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.expect("could not resolve specifier");
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let source = r#"
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export class A {
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render() {
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return <div><span></span></div>
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}
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}
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"#;
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let module = parse(&specifier, source, &MediaType::TSX)
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.expect("could not parse module");
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let (code, _) = module
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.transpile(&TranspileOptions::default())
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.expect("could not strip types");
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assert!(code
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.to_string()
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.unwrap()
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.contains("React.createElement(\"div\", null"));
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}
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#[test]
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fn test_transpile_decorators() {
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let specifier =
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ModuleSpecifier::resolve_url_or_path("https://deno.land/x/mod.ts")
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.expect("could not resolve specifier");
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let source = r#"
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function enumerable(value: boolean) {
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return function (
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_target: any,
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_propertyKey: string,
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descriptor: PropertyDescriptor,
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) {
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descriptor.enumerable = value;
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};
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}
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export class A {
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@enumerable(false)
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a() {
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Test.value;
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}
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}
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"#;
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let module = parse(&specifier, source, &MediaType::TypeScript)
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.expect("could not parse module");
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let (code, _) = module
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.transpile(&TranspileOptions::default())
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.expect("could not strip types");
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assert!(code
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.to_string()
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.unwrap()
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.contains("_applyDecoratedDescriptor("));
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}
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}
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