[−][src]Crate swc_ecma_parser
es2019 parser
Features
Heavily tested
Passes almost all tests from tc39/test262.
Error reporting
error: 'implements', 'interface', 'let', 'package', 'private', 'protected', 'public', 'static', or 'yield' cannot be used as an identifier in strict mode
--> invalid.js:3:10
|
3 | function yield() {
| ^^^^^
Error recovery
The parser can recover from some parsing erros. For example, parser returns
Ok(Module)
for the code below, while emitting error to handler.
const CONST = 9000 % 2;
const enum D {
// Comma is requied, but parser can recover because of the newline.
d = 10
g = CONST
}
Example (lexer)
See lexer.rs
in examples directory.
Example (parser)
#[macro_use] extern crate swc_common; extern crate swc_ecma_parser; use std::sync::Arc; use swc_common::{ errors::{ColorConfig, Handler}, FileName, FilePathMapping, SourceMap, }; use swc_ecma_parser::{lexer::Lexer, Parser, Session, SourceFileInput, Syntax}; fn main() { swc_common::GLOBALS.set(&swc_common::Globals::new(), || { let cm: Arc<SourceMap> = Default::default(); let handler = Handler::with_tty_emitter(ColorConfig::Auto, true, false, Some(cm.clone())); let session = Session { handler: &handler }; // Real usage // let fm = cm // .load_file(Path::new("test.js")) // .expect("failed to load test.js"); let fm = cm.new_source_file( FileName::Custom("test.js".into()), "function foo() {}".into(), ); let lexer = Lexer::new( session, Syntax::Es(Default::default()), Default::default(), SourceFileInput::from(&*fm), None, ); let mut parser = Parser::new_from(session, lexer); let _module = parser .parse_module() .map_err(|mut e| { e.emit(); () }) .expect("failed to parser module"); }); }
Modules
input | |
lexer | ECMAScript lexer. |
Structs
Capturing | Note: Lexer need access to parser's context to lex correctly. |
Context | Syntactic context. |
EsConfig | |
Parser | EcmaScript parser. |
Session | |
SourceFileInput | |
TokensInput | |
TsConfig |
Enums
JscTarget | |
Syntax |
Traits
Input | |
Tokens |
Type Definitions
PResult | When error occurs, error is emitted and parser returns Err(()). |