1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
//! EcmaScript/TypeScript parser for the rust programming language.
//!
//! # Features
//!
//! ## Heavily tested
//!
//! Passes almost all tests from [tc39/test262][].
//!
//! ## Error reporting
//!
//! ```sh
//! 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 errors. For example, parser returns
//! `Ok(Module)` for the code below, while emitting error to handler.
//!
//! ```ts
//! const CONST = 9000 % 2;
//! const enum D {
//!     // Comma is required, 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 swc_common::sync::Lrc;
//! use swc_common::{
//!     errors::{ColorConfig, Handler},
//!     FileName, FilePathMapping, SourceMap,
//! };
//! use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax};
//!
//! fn main() {
//!     let cm: Lrc<SourceMap> = Default::default();
//!     let handler =
//!         Handler::with_tty_emitter(ColorConfig::Auto, true, false,
//!         Some(cm.clone()));
//!
//!     // 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(
//!         // We want to parse ecmascript
//!         Syntax::Es(Default::default()),
//!         // JscTarget defaults to es5
//!         Default::default(),
//!         StringInput::from(&*fm),
//!         None,
//!     );
//!
//!     let mut parser = Parser::new_from(lexer);
//!
//!     for e in parser.take_errors() {
//!         e.into_diagnostic(&handler).emit();
//!     }
//!
//!     let _module = parser
//!         .parse_module()
//!         .map_err(|mut e| {
//!             // Unrecoverable fatal error occurred
//!             e.into_diagnostic(&handler).emit()
//!         })
//!         .expect("failed to parser module");
//! }
//! ```
//!
//! ## Known issues
//!
//! ### Null character after `\`
//!
//! Becuase [String] of rust should only contain valid utf-8 characters while
//! javascript allows non-utf8 chraceters, the parser stores invalid utf8
//! chracters in escpaed form.
//!
//! As a result, swc needs a way to distinguish invalid-utf8 code points and
//! input specified by the user. The parser stores a null chracter right after
//! `\\` for non-utf8 code points. Note that other parts of swc is aware of this
//! fact.
//!
//! Note that this can be changed at anytime with a breaking change.
//!
//! [tc39/test262]:https://github.com/tc39/test262

#![cfg_attr(test, feature(bench_black_box))]
#![cfg_attr(test, feature(test))]
#![deny(unused)]

pub use self::{
    lexer::input::{Input, StringInput},
    parser::*,
};
use serde::{Deserialize, Serialize};
use swc_common::Span;
pub use swc_ecma_ast::EsVersion as JscTarget;

#[macro_use]
mod macros;
pub mod error;
pub mod lexer;
mod parser;
pub mod token;

#[derive(Debug, Clone, Copy, Deserialize, Serialize)]
#[serde(deny_unknown_fields, tag = "syntax")]
pub enum Syntax {
    /// Standard
    #[serde(rename = "ecmascript")]
    Es(EsConfig),
    /// This variant requires the cargo feature `typescript` to be enabled.
    #[cfg(feature = "typescript")]
    #[serde(rename = "typescript")]
    Typescript(TsConfig),
}

impl Default for Syntax {
    fn default() -> Self {
        Syntax::Es(Default::default())
    }
}

impl Syntax {
    pub fn import_assertions(self) -> bool {
        match self {
            Syntax::Es(EsConfig {
                import_assertions, ..
            })
            | Syntax::Typescript(TsConfig {
                import_assertions, ..
            }) => import_assertions,
        }
    }

    pub fn static_blocks(self) -> bool {
        match self {
            Syntax::Es(EsConfig {
                static_blocks: true,
                ..
            })
            | Syntax::Typescript(..) => true,
            _ => false,
        }
    }

    /// Should we parse jsx?
    pub fn jsx(self) -> bool {
        match self {
            Syntax::Es(EsConfig { jsx: true, .. })
            | Syntax::Typescript(TsConfig { tsx: true, .. }) => true,
            _ => false,
        }
    }

    pub const fn optional_chaining(self) -> bool {
        true
    }

    pub const fn dynamic_import(self) -> bool {
        true
    }

    pub fn fn_bind(self) -> bool {
        match self {
            Syntax::Es(EsConfig { fn_bind: true, .. }) => true,
            _ => false,
        }
    }

    pub const fn num_sep(self) -> bool {
        true
    }

    pub fn decorators(self) -> bool {
        match self {
            Syntax::Es(EsConfig {
                decorators: true, ..
            })
            | Syntax::Typescript(TsConfig {
                decorators: true, ..
            }) => true,
            _ => false,
        }
    }

    pub const fn class_private_methods(self) -> bool {
        true
    }

    pub const fn class_private_props(self) -> bool {
        true
    }

    pub const fn class_props(self) -> bool {
        true
    }

    pub fn decorators_before_export(self) -> bool {
        match self {
            Syntax::Es(EsConfig {
                decorators_before_export: true,
                ..
            })
            | Syntax::Typescript(..) => true,
            _ => false,
        }
    }

    /// Should we pare typescript?
    #[cfg(not(feature = "typescript"))]
    pub const fn typescript(self) -> bool {
        false
    }

    /// Should we pare typescript?
    #[cfg(feature = "typescript")]
    pub const fn typescript(self) -> bool {
        match self {
            Syntax::Typescript(..) => true,
            _ => false,
        }
    }

    pub fn export_default_from(self) -> bool {
        match self {
            Syntax::Es(EsConfig {
                export_default_from: true,
                ..
            }) => true,
            _ => false,
        }
    }

    /// `true`
    pub const fn export_namespace_from(self) -> bool {
        true
    }

    /// `true`
    pub const fn nullish_coalescing(self) -> bool {
        true
    }

    pub const fn import_meta(self) -> bool {
        true
    }

    pub const fn top_level_await(self) -> bool {
        true
    }

    pub fn dts(self) -> bool {
        match self {
            Syntax::Typescript(t) => t.dts,
            _ => false,
        }
    }

    pub(crate) fn early_errors(self) -> bool {
        match self {
            Syntax::Typescript(t) => !t.no_early_errors,
            Syntax::Es(..) => true,
        }
    }
}

#[derive(Debug, Clone, Copy, Default, Serialize, Deserialize)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct TsConfig {
    #[serde(default)]
    pub tsx: bool,

    #[serde(default)]
    pub decorators: bool,

    #[serde(default)]
    pub dynamic_import: bool,

    /// `.d.ts`
    #[serde(skip, default)]
    pub dts: bool,

    #[serde(skip, default)]
    pub no_early_errors: bool,

    /// Stage 3.
    #[serde(default)]
    pub import_assertions: bool,
}

#[derive(Debug, Clone, Copy, Default, Serialize, Deserialize)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct EsConfig {
    #[serde(default)]
    pub jsx: bool,
    /// Support numeric separator.
    /// Stage 3.
    #[serde(rename = "numericSeparator")]
    #[serde(default)]
    pub num_sep: bool,

    #[serde(rename = "classPrivateProperty")]
    #[serde(default)]
    pub class_private_props: bool,

    #[serde(rename = "privateMethod")]
    #[serde(default)]
    pub class_private_methods: bool,

    #[serde(rename = "classProperty")]
    #[serde(default)]
    pub class_props: bool,

    /// Support function bind expression.
    #[serde(rename = "functionBind")]
    #[serde(default)]
    pub fn_bind: bool,

    /// Enable decorators.
    #[serde(default)]
    pub decorators: bool,

    /// babel: `decorators.decoratorsBeforeExport`
    ///
    /// Effective only if `decorator` is true.
    #[serde(rename = "decoratorsBeforeExport")]
    #[serde(default)]
    pub decorators_before_export: bool,

    #[serde(default)]
    pub export_default_from: bool,

    #[serde(default)]
    pub export_namespace_from: bool,

    #[serde(default)]
    pub dynamic_import: bool,

    /// Stage 3.
    #[serde(default)]
    pub nullish_coalescing: bool,

    #[serde(default)]
    pub optional_chaining: bool,

    /// Stage 3.
    #[serde(default)]
    pub import_meta: bool,

    /// Stage 3.
    #[serde(default)]
    pub top_level_await: bool,

    /// Stage 3.
    #[serde(default)]
    pub import_assertions: bool,

    #[serde(default)]
    #[serde(rename = "staticBlocks")]
    pub static_blocks: bool,
}

/// Syntactic context.
#[derive(Debug, Clone, Copy, Default)]
pub struct Context {
    /// Is in module code?
    module: bool,
    can_be_module: bool,
    strict: bool,
    include_in_expr: bool,
    /// If true, await expression is parsed, and "await" is treated as a
    /// keyword.
    in_async: bool,
    /// If true, yield expression is parsed, and "yield" is treated as a
    /// keyword.
    in_generator: bool,

    is_continue_allowed: bool,
    is_break_allowed: bool,

    in_type: bool,
    /// Typescript extension.
    in_declare: bool,
    span_of_fn_name: Option<Span>,

    /// If true, `:` should not be treated as a type annotation.
    in_cond_expr: bool,
    is_direct_child_of_cond: bool,

    in_function: bool,

    in_parameters: bool,

    has_super_class: bool,
    in_method: bool,
    in_class_prop: bool,

    in_property_name: bool,

    in_forced_jsx_context: bool,

    /// If true, `:` should not be treated as a type annotation.
    dont_parse_colon_as_type_ann: bool,
}

#[cfg(test)]
fn with_test_sess<F, Ret>(src: &str, f: F) -> Result<Ret, ::testing::StdErr>
where
    F: FnOnce(&swc_common::errors::Handler, StringInput<'_>) -> Result<Ret, ()>,
{
    use swc_common::FileName;

    ::testing::run_test(false, |cm, handler| {
        let fm = cm.new_source_file(FileName::Real("testing".into()), src.into());

        f(handler, (&*fm).into())
    })
}