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List of Acorn contributors. Updated before every release.
Adrian Heine
Adrian Rakovsky
Alistair Braidwood
Amila Welihinda
Andres Suarez
Angelo
Aparajita Fishman
Arian Stolwijk
Artem Govorov
Boopesh Mahendran
Bradley Heinz
Brandon Mills
Charles Hughes
Charmander
Chris McKnight
Conrad Irwin
Daniel Tschinder
David Bonnet
Domenico Matteo
ehmicky
Eugene Obrezkov
Felix Maier
Forbes Lindesay
Gilad Peleg
impinball
Ingvar Stepanyan
Jackson Ray Hamilton
Jesse McCarthy
Jiaxing Wang
Joel Kemp
Johannes Herr
John-David Dalton
Jordan Klassen
Jürg Lehni
Kai Cataldo
keeyipchan
Keheliya Gallaba
Kevin Irish
Kevin Kwok
krator
laosb
luckyzeng
Marek
Marijn Haverbeke
Martin Carlberg
Mat Garcia
Mathias Bynens
Mathieu 'p01' Henri
Matthew Bastien
Max Schaefer
Max Zerzouri
Mihai Bazon
Mike Rennie
naoh
Nicholas C. Zakas
Nick Fitzgerald
Olivier Thomann
Oskar Schöldström
Paul Harper
Peter Rust
PlNG
Prayag Verma
ReadmeCritic
r-e-d
Renée Kooi
Richard Gibson
Rich Harris
Sebastian McKenzie
Shahar Soel
Sheel Bedi
Simen Bekkhus
Teddy Katz
Timothy Gu
Toru Nagashima
Victor Homyakov
Wexpo Lyu
zsjforcn

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## 5.7.3 (2018-09-10)
### Bug fixes
Fix failure to tokenize regexps after expressions like `x.of`.
Better error message for unterminated template literals.
## 5.7.2 (2018-08-24)
### Bug fixes
Properly handle `allowAwaitOutsideFunction` in for statements.
Treat function declarations at the top level of modules like let bindings.
Don't allow async function declarations as the only statement under a label.
## 5.7.1 (2018-06-15)
### Bug fixes
Make sure the walker and bin files are rebuilt on release (the previous release didn't get the up-to-date versions).
## 5.7.0 (2018-06-15)
### Bug fixes
Fix crash in walker when walking a binding-less catch node.
### New features
Upgraded to Unicode 11.
## 5.6.2 (2018-06-05)
### Bug fixes
In the walker, go back to allowing the `baseVisitor` argument to be null to default to the default base everywhere.
## 5.6.1 (2018-06-01)
### Bug fixes
Fix regression when passing `null` as fourth argument to `walk.recursive`.
## 5.6.0 (2018-05-31)
### Bug fixes
Fix a bug in the walker that caused a crash when walking an object pattern spread.
### New features
Allow U+2028 and U+2029 in string when ECMAVersion >= 10.
Allow binding-less catch statements when ECMAVersion >= 10.
Add `allowAwaitOutsideFunction` option for parsing top-level `await`.
## 5.5.3 (2018-03-08)
### Bug fixes
A _second_ republish of the code in 5.5.1, this time with yarn, to hopefully get valid timestamps.
## 5.5.2 (2018-03-08)
### Bug fixes
A republish of the code in 5.5.1 in an attempt to solve an issue with the file timestamps in the npm package being 0.
## 5.5.1 (2018-03-06)
### Bug fixes
Fix regression in walker causing property values in object patterns to be walked as expressions.
Fix misleading error message for octal escapes in template strings.
## 5.5.0 (2018-02-27)
### Bug fixes
Support object spread in the AST walker.
### New features
The identifier character categorization is now based on Unicode version 10.
Acorn will now validate the content of regular expressions, including new ES9 features.
## 5.4.1 (2018-02-02)
### Bug fixes
5.4.0 somehow accidentally included an old version of walk.js.
## 5.4.0 (2018-02-01)
### Bug fixes
Disallow duplicate or escaped flags on regular expressions.
Disallow octal escapes in strings in strict mode.
### New features
Add support for async iteration.
Add support for object spread and rest.
## 5.3.0 (2017-12-28)
### Bug fixes
Fix parsing of floating point literals with leading zeroes in loose mode.
Allow duplicate property names in object patterns.
Don't allow static class methods named `prototype`.
Disallow async functions directly under `if` or `else`.
Parse right-hand-side of `for`/`of` as an assignment expression.
Stricter parsing of `for`/`in`.
Don't allow unicode escapes in contextual keywords.
### New features
Parsing class members was factored into smaller methods to allow plugins to hook into it.
## 5.2.1 (2017-10-30)
### Bug fixes
Fix a token context corruption bug.
## 5.2.0 (2017-10-30)
### Bug fixes
Fix token context tracking for `class` and `function` in property-name position.
Make sure `%*` isn't parsed as a valid operator.
The `full` and `fullAncestor` walkers no longer visit nodes multiple times.
Allow shorthand properties `get` and `set` to be followed by default values.
Disallow `super` when not in callee or object position.
### New features
Support [`directive` property](https://github.com/estree/estree/compare/b3de58c9997504d6fba04b72f76e6dd1619ee4eb...1da8e603237144f44710360f8feb7a9977e905e0) on directive expression statements.
## 5.1.2 (2017-09-04)
### Bug fixes
Disable parsing of legacy HTML-style comments in modules.
Fix parsing of async methods whose names are keywords.
## 5.1.1 (2017-07-06)
### Bug fixes
Fix problem with disambiguating regexp and division after a class.
## 5.1.0 (2017-07-05)
### Bug fixes
Fix tokenizing of regexps in an object-desctructuring `for`/`of` loop and after `yield`.
Parse zero-prefixed numbers with non-octal digits as decimal.
Allow object/array patterns in rest parameters.
Don't error when `yield` is used as a property name.
Allow `async` as a shorthand object property.
Make the ES module version of the loose parser actually work.
### New features
Implement the [template literal revision proposal](https://github.com/tc39/proposal-template-literal-revision) for ES9.
New walker functions `full` and `fullAncestor`.
## 5.0.3 (2017-04-01)
### Bug fixes
Fix spurious duplicate variable definition errors for named functions.
## 5.0.2 (2017-03-30)
### Bug fixes
A binary operator after a parenthesized arrow expression is no longer incorrectly treated as an error.
## 5.0.0 (2017-03-28)
### Bug fixes
Raise an error for duplicated lexical bindings.
Fix spurious error when an assignement expression occurred after a spread expression.
Accept regular expressions after `of` (in `for`/`of`), `yield` (in a generator), and braced arrow functions.
Allow labels in front or `var` declarations, even in strict mode.
### Breaking changes
Parse declarations following `export default` as declaration nodes, not expressions. This means that class and function declarations nodes can now have `null` as their `id`.
## 4.0.11 (2017-02-07)
### Bug fixes
Allow all forms of member expressions to be parenthesized as lvalue.
## 4.0.10 (2017-02-07)
### Bug fixes
Don't expect semicolons after default-exported functions or classes,
even when they are expressions.
Check for use of `'use strict'` directives in non-simple parameter
functions, even when already in strict mode.
## 4.0.9 (2017-02-06)
### Bug fixes
Fix incorrect error raised for parenthesized simple assignment
targets, so that `(x) = 1` parses again.
## 4.0.8 (2017-02-03)
### Bug fixes
Solve spurious parenthesized pattern errors by temporarily erring on
the side of accepting programs that our delayed errors don't handle
correctly yet.
## 4.0.7 (2017-02-02)
### Bug fixes
Accept invalidly rejected code like `(x).y = 2` again.
Don't raise an error when a function _inside_ strict code has a
non-simple parameter list.
## 4.0.6 (2017-02-02)
### Bug fixes
Fix exponential behavior (manifesting itself as a complete hang for
even relatively small source files) introduced by the new 'use strict'
check.
## 4.0.5 (2017-02-02)
### Bug fixes
Disallow parenthesized pattern expressions.
Allow keywords as export names.
Don't allow the `async` keyword to be parenthesized.
Properly raise an error when a keyword contains a character escape.
Allow `"use strict"` to appear after other string literal expressions.
Disallow labeled declarations.
## 4.0.4 (2016-12-19)
### Bug fixes
Fix issue with loading acorn_loose.js with an AMD loader.
Fix crash when `export` was followed by a keyword that can't be
exported.
## 4.0.3 (2016-08-16)
### Bug fixes
Allow regular function declarations inside single-statement `if`
branches in loose mode. Forbid them entirely in strict mode.
Properly parse properties named `async` in ES2017 mode.
Fix bug where reserved words were broken in ES2017 mode.
## 4.0.2 (2016-08-11)
### Bug fixes
Don't ignore period or 'e' characters after octal numbers.
Fix broken parsing for call expressions in default parameter values
of arrow functions.
## 4.0.1 (2016-08-08)
### Bug fixes
Fix false positives in duplicated export name errors.
## 4.0.0 (2016-08-07)
### Breaking changes
The default `ecmaVersion` option value is now 7.
A number of internal method signatures changed, so plugins might need
to be updated.
### Bug fixes
The parser now raises errors on duplicated export names.
`arguments` and `eval` can now be used in shorthand properties.
Duplicate parameter names in non-simple argument lists now always
produce an error.
### New features
The `ecmaVersion` option now also accepts year-style version numbers
(2015, etc).
Support for `async`/`await` syntax when `ecmaVersion` is >= 8.
Support for trailing commas in call expressions when `ecmaVersion`
is >= 8.
## 3.3.0 (2016-07-25)
### Bug fixes
Fix bug in tokenizing of regexp operator after a function declaration.
Fix parser crash when parsing an array pattern with a hole.
### New features
Implement check against complex argument lists in functions that
enable strict mode in ES7.
## 3.2.0 (2016-06-07)
### Bug fixes
Improve handling of lack of unicode regexp support in host
environment.
Properly reject shorthand properties whose name is a keyword.
Don't crash when the loose parser is called without options object.
### New features
Visitors created with `visit.make` now have their base as _prototype_,
rather than copying properties into a fresh object.
Make it possible to use `visit.ancestor` with a walk state.
## 3.1.0 (2016-04-18)
### Bug fixes
Fix issue where the loose parser created invalid TemplateElement nodes
for unclosed template literals.
Properly tokenize the division operator directly after a function
expression.
Allow trailing comma in destructuring arrays.
### New features
The walker now allows defining handlers for `CatchClause` nodes.
## 3.0.4 (2016-02-25)
### Fixes
Allow update expressions as left-hand-side of the ES7 exponential
operator.
## 3.0.2 (2016-02-10)
### Fixes
Fix bug that accidentally made `undefined` a reserved word when
parsing ES7.
## 3.0.0 (2016-02-10)
### Breaking changes
The default value of the `ecmaVersion` option is now 6 (used to be 5).
Support for comprehension syntax (which was dropped from the draft
spec) has been removed.
### Fixes
`let` and `yield` are now “contextual keywords”, meaning you can
mostly use them as identifiers in ES5 non-strict code.
A parenthesized class or function expression after `export default` is
now parsed correctly.
### New features
When `ecmaVersion` is set to 7, Acorn will parse the exponentiation
operator (`**`).
The identifier character ranges are now based on Unicode 8.0.0.
Plugins can now override the `raiseRecoverable` method to override the
way non-critical errors are handled.
## 2.7.0 (2016-01-04)
### Fixes
Stop allowing rest parameters in setters.
Make sure the loose parser always attaches a `local` property to
`ImportNamespaceSpecifier` nodes.
Disallow `y` rexexp flag in ES5.
Disallow `\00` and `\000` escapes in strict mode.
Raise an error when an import name is a reserved word.
## 2.6.4 (2015-11-12)
### Fixes
Fix crash in loose parser when parsing invalid object pattern.
### New features
Support plugins in the loose parser.
## 2.6.2 (2015-11-10)
### Fixes
Don't crash when no options object is passed.
## 2.6.0 (2015-11-09)
### Fixes
Add `await` as a reserved word in module sources.
Disallow `yield` in a parameter default value for a generator.
Forbid using a comma after a rest pattern in an array destructuring.
### New features
Support parsing stdin in command-line tool.
## 2.5.2 (2015-10-27)
### Fixes
Fix bug where the walker walked an exported `let` statement as an
expression.
## 2.5.0 (2015-10-27)
### Fixes
Fix tokenizer support in the command-line tool.
In the loose parser, don't allow non-string-literals as import
sources.
Stop allowing `new.target` outside of functions.
Remove legacy `guard` and `guardedHandler` properties from try nodes.
Stop allowing multiple `__proto__` properties on an object literal in
strict mode.
Don't allow rest parameters to be non-identifier patterns.
Check for duplicate paramter names in arrow functions.

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Copyright (C) 2012-2018 by various contributors (see AUTHORS)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# Acorn
[![Build Status](https://travis-ci.org/acornjs/acorn.svg?branch=master)](https://travis-ci.org/acornjs/acorn)
[![NPM version](https://img.shields.io/npm/v/acorn.svg)](https://www.npmjs.com/package/acorn)
[![CDNJS](https://img.shields.io/cdnjs/v/acorn.svg)](https://cdnjs.com/libraries/acorn)
[Author funding status: ![maintainer happiness](https://marijnhaverbeke.nl/fund/status_s.png?force)](https://marijnhaverbeke.nl/fund/)
A tiny, fast JavaScript parser, written completely in JavaScript.
## Community
Acorn is open source software released under an
[MIT license](https://github.com/acornjs/acorn/blob/master/LICENSE).
You are welcome to
[report bugs](https://github.com/acornjs/acorn/issues) or create pull
requests on [github](https://github.com/acornjs/acorn). For questions
and discussion, please use the
[Tern discussion forum](https://discuss.ternjs.net).
## Installation
The easiest way to install acorn is with [`npm`][npm].
[npm]: https://www.npmjs.com/
```sh
npm install acorn
```
Alternately, you can download the source and build acorn yourself:
```sh
git clone https://github.com/acornjs/acorn.git
cd acorn
npm install
npm run build
```
## Components
When run in a CommonJS (node.js) or AMD environment, exported values
appear in the interfaces exposed by the individual files, as usual.
When loaded in the browser (Acorn works in any JS-enabled browser more
recent than IE5) without any kind of module management, a single
global object `acorn` will be defined, and all the exported properties
will be added to that.
### Main parser
This is implemented in `dist/acorn.js`, and is what you get when you
`require("acorn")` in node.js.
**parse**`(input, options)` is used to parse a JavaScript program.
The `input` parameter is a string, `options` can be undefined or an
object setting some of the options listed below. The return value will
be an abstract syntax tree object as specified by the
[ESTree spec][estree].
When encountering a syntax error, the parser will raise a
`SyntaxError` object with a meaningful message. The error object will
have a `pos` property that indicates the character offset at which the
error occurred, and a `loc` object that contains a `{line, column}`
object referring to that same position.
[estree]: https://github.com/estree/estree
- **ecmaVersion**: Indicates the ECMAScript version to parse. Must be
either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018) or 10 (2019, partial
support). This influences support for strict mode, the set of
reserved words, and support for new syntax features. Default is 7.
**NOTE**: Only 'stage 4' (finalized) ECMAScript features are being
implemented by Acorn.
- **sourceType**: Indicate the mode the code should be parsed in. Can be
either `"script"` or `"module"`. This influences global strict mode
and parsing of `import` and `export` declarations.
- **onInsertedSemicolon**: If given a callback, that callback will be
called whenever a missing semicolon is inserted by the parser. The
callback will be given the character offset of the point where the
semicolon is inserted as argument, and if `locations` is on, also a
`{line, column}` object representing this position.
- **onTrailingComma**: Like `onInsertedSemicolon`, but for trailing
commas.
- **allowReserved**: If `false`, using a reserved word will generate
an error. Defaults to `true` for `ecmaVersion` 3, `false` for higher
versions. When given the value `"never"`, reserved words and
keywords can also not be used as property names (as in Internet
Explorer's old parser).
- **allowReturnOutsideFunction**: By default, a return statement at
the top level raises an error. Set this to `true` to accept such
code.
- **allowImportExportEverywhere**: By default, `import` and `export`
declarations can only appear at a program's top level. Setting this
option to `true` allows them anywhere where a statement is allowed.
- **allowAwaitOutsideFunction**: By default, `await` expressions can only appear inside `async` functions. Setting this option to `true` allows to have top-level `await` expressions. They are still not allowed in non-`async` functions, though.
- **allowHashBang**: When this is enabled (off by default), if the
code starts with the characters `#!` (as in a shellscript), the
first line will be treated as a comment.
- **locations**: When `true`, each node has a `loc` object attached
with `start` and `end` subobjects, each of which contains the
one-based line and zero-based column numbers in `{line, column}`
form. Default is `false`.
- **onToken**: If a function is passed for this option, each found
token will be passed in same format as tokens returned from
`tokenizer().getToken()`.
If array is passed, each found token is pushed to it.
Note that you are not allowed to call the parser from the
callback—that will corrupt its internal state.
- **onComment**: If a function is passed for this option, whenever a
comment is encountered the function will be called with the
following parameters:
- `block`: `true` if the comment is a block comment, false if it
is a line comment.
- `text`: The content of the comment.
- `start`: Character offset of the start of the comment.
- `end`: Character offset of the end of the comment.
When the `locations` options is on, the `{line, column}` locations
of the comments start and end are passed as two additional
parameters.
If array is passed for this option, each found comment is pushed
to it as object in Esprima format:
```javascript
{
"type": "Line" | "Block",
"value": "comment text",
"start": Number,
"end": Number,
// If `locations` option is on:
"loc": {
"start": {line: Number, column: Number}
"end": {line: Number, column: Number}
},
// If `ranges` option is on:
"range": [Number, Number]
}
```
Note that you are not allowed to call the parser from the
callback—that will corrupt its internal state.
- **ranges**: Nodes have their start and end characters offsets
recorded in `start` and `end` properties (directly on the node,
rather than the `loc` object, which holds line/column data. To also
add a [semi-standardized][range] `range` property holding a
`[start, end]` array with the same numbers, set the `ranges` option
to `true`.
- **program**: It is possible to parse multiple files into a single
AST by passing the tree produced by parsing the first file as the
`program` option in subsequent parses. This will add the toplevel
forms of the parsed file to the "Program" (top) node of an existing
parse tree.
- **sourceFile**: When the `locations` option is `true`, you can pass
this option to add a `source` attribute in every nodes `loc`
object. Note that the contents of this option are not examined or
processed in any way; you are free to use whatever format you
choose.
- **directSourceFile**: Like `sourceFile`, but a `sourceFile` property
will be added (regardless of the `location` option) directly to the
nodes, rather than the `loc` object.
- **preserveParens**: If this option is `true`, parenthesized expressions
are represented by (non-standard) `ParenthesizedExpression` nodes
that have a single `expression` property containing the expression
inside parentheses.
[range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
**parseExpressionAt**`(input, offset, options)` will parse a single
expression in a string, and return its AST. It will not complain if
there is more of the string left after the expression.
**getLineInfo**`(input, offset)` can be used to get a `{line,
column}` object for a given program string and character offset.
**tokenizer**`(input, options)` returns an object with a `getToken`
method that can be called repeatedly to get the next token, a `{start,
end, type, value}` object (with added `loc` property when the
`locations` option is enabled and `range` property when the `ranges`
option is enabled). When the token's type is `tokTypes.eof`, you
should stop calling the method, since it will keep returning that same
token forever.
In ES6 environment, returned result can be used as any other
protocol-compliant iterable:
```javascript
for (let token of acorn.tokenizer(str)) {
// iterate over the tokens
}
// transform code to array of tokens:
var tokens = [...acorn.tokenizer(str)];
```
**tokTypes** holds an object mapping names to the token type objects
that end up in the `type` properties of tokens.
#### Note on using with [Escodegen][escodegen]
Escodegen supports generating comments from AST, attached in
Esprima-specific format. In order to simulate same format in
Acorn, consider following example:
```javascript
var comments = [], tokens = [];
var ast = acorn.parse('var x = 42; // answer', {
// collect ranges for each node
ranges: true,
// collect comments in Esprima's format
onComment: comments,
// collect token ranges
onToken: tokens
});
// attach comments using collected information
escodegen.attachComments(ast, comments, tokens);
// generate code
console.log(escodegen.generate(ast, {comment: true}));
// > 'var x = 42; // answer'
```
[escodegen]: https://github.com/estools/escodegen
### dist/acorn_loose.js ###
This file implements an error-tolerant parser. It exposes a single
function. The loose parser is accessible in node.js via `require("acorn/dist/acorn_loose")`.
**parse_dammit**`(input, options)` takes the same arguments and
returns the same syntax tree as the `parse` function in `acorn.js`,
but never raises an error, and will do its best to parse syntactically
invalid code in as meaningful a way as it can. It'll insert identifier
nodes with name `"✖"` as placeholders in places where it can't make
sense of the input. Depends on `acorn.js`, because it uses the same
tokenizer.
### dist/walk.js ###
Implements an abstract syntax tree walker. Will store its interface in
`acorn.walk` when loaded without a module system.
**simple**`(node, visitors, base, state)` does a 'simple' walk over
a tree. `node` should be the AST node to walk, and `visitors` an
object with properties whose names correspond to node types in the
[ESTree spec][estree]. The properties should contain functions
that will be called with the node object and, if applicable the state
at that point. The last two arguments are optional. `base` is a walker
algorithm, and `state` is a start state. The default walker will
simply visit all statements and expressions and not produce a
meaningful state. (An example of a use of state is to track scope at
each point in the tree.)
```js
const acorn = require("acorn")
const walk = require("acorn/dist/walk")
walk.simple(acorn.parse("let x = 10"), {
Literal(node) {
console.log(`Found a literal: ${node.value}`)
}
})
```
**ancestor**`(node, visitors, base, state)` does a 'simple' walk over
a tree, building up an array of ancestor nodes (including the current node)
and passing the array to the callbacks as a third parameter.
```js
const acorn = require("acorn")
const walk = require("acorn/dist/walk")
walk.ancestor(acorn.parse("foo('hi')"), {
Literal(_, ancestors) {
console.log("This literal's ancestors are:",
ancestors.map(n => n.type))
}
})
```
**recursive**`(node, state, functions, base)` does a 'recursive'
walk, where the walker functions are responsible for continuing the
walk on the child nodes of their target node. `state` is the start
state, and `functions` should contain an object that maps node types
to walker functions. Such functions are called with `(node, state, c)`
arguments, and can cause the walk to continue on a sub-node by calling
the `c` argument on it with `(node, state)` arguments. The optional
`base` argument provides the fallback walker functions for node types
that aren't handled in the `functions` object. If not given, the
default walkers will be used.
**make**`(functions, base)` builds a new walker object by using the
walker functions in `functions` and filling in the missing ones by
taking defaults from `base`.
**full**`(node, callback, base, state)` does a 'full'
walk over a tree, calling the callback with the arguments (node, state, type)
for each node
**fullAncestor**`(node, callback, base, state)` does a 'full' walk over
a tree, building up an array of ancestor nodes (including the current node)
and passing the array to the callbacks as a third parameter.
```js
const acorn = require("acorn")
const walk = require("acorn/dist/walk")
walk.full(acorn.parse("1 + 1"), node => {
console.log(`There's a ${node.type} node at ${node.ch}`)
})
```
**findNodeAt**`(node, start, end, test, base, state)` tries to
locate a node in a tree at the given start and/or end offsets, which
satisfies the predicate `test`. `start` and `end` can be either `null`
(as wildcard) or a number. `test` may be a string (indicating a node
type) or a function that takes `(nodeType, node)` arguments and
returns a boolean indicating whether this node is interesting. `base`
and `state` are optional, and can be used to specify a custom walker.
Nodes are tested from inner to outer, so if two nodes match the
boundaries, the inner one will be preferred.
**findNodeAround**`(node, pos, test, base, state)` is a lot like
`findNodeAt`, but will match any node that exists 'around' (spanning)
the given position.
**findNodeAfter**`(node, pos, test, base, state)` is similar to
`findNodeAround`, but will match all nodes *after* the given position
(testing outer nodes before inner nodes).
## Command line interface
The `bin/acorn` utility can be used to parse a file from the command
line. It accepts as arguments its input file and the following
options:
- `--ecma3|--ecma5|--ecma6|--ecma7|--ecma8|--ecma9|--ecma10`: Sets the ECMAScript version
to parse. Default is version 7.
- `--module`: Sets the parsing mode to `"module"`. Is set to `"script"` otherwise.
- `--locations`: Attaches a "loc" object to each node with "start" and
"end" subobjects, each of which contains the one-based line and
zero-based column numbers in `{line, column}` form.
- `--allow-hash-bang`: If the code starts with the characters #! (as in a shellscript), the first line will be treated as a comment.
- `--compact`: No whitespace is used in the AST output.
- `--silent`: Do not output the AST, just return the exit status.
- `--help`: Print the usage information and quit.
The utility spits out the syntax tree as JSON data.
## Build system
Acorn is written in ECMAScript 6, as a set of small modules, in the
project's `src` directory, and compiled down to bigger ECMAScript 3
files in `dist` using [Browserify](http://browserify.org) and
[Babel](http://babeljs.io/). If you are already using Babel, you can
consider including the modules directly.
The command-line test runner (`npm test`) uses the ES6 modules. The
browser-based test page (`test/index.html`) uses the compiled modules.
The `bin/build-acorn.js` script builds the latter from the former.
If you are working on Acorn, you'll probably want to try the code out
directly, without an intermediate build step. In your scripts, you can
register the Babel require shim like this:
require("babel-core/register")
That will allow you to directly `require` the ES6 modules.
## Plugins
Acorn is designed support allow plugins which, within reasonable
bounds, redefine the way the parser works. Plugins can add new token
types and new tokenizer contexts (if necessary), and extend methods in
the parser object. This is not a clean, elegant API—using it requires
an understanding of Acorn's internals, and plugins are likely to break
whenever those internals are significantly changed. But still, it is
_possible_, in this way, to create parsers for JavaScript dialects
without forking all of Acorn. And in principle it is even possible to
combine such plugins, so that if you have, for example, a plugin for
parsing types and a plugin for parsing JSX-style XML literals, you
could load them both and parse code with both JSX tags and types.
A plugin should register itself by adding a property to
`acorn.plugins`, which holds a function. Calling `acorn.parse`, a
`plugins` option can be passed, holding an object mapping plugin names
to configuration values (or just `true` for plugins that don't take
options). After the parser object has been created, the initialization
functions for the chosen plugins are called with `(parser,
configValue)` arguments. They are expected to use the `parser.extend`
method to extend parser methods. For example, the `readToken` method
could be extended like this:
```javascript
parser.extend("readToken", function(nextMethod) {
return function(code) {
console.log("Reading a token!")
return nextMethod.call(this, code)
}
})
```
The `nextMethod` argument passed to `extend`'s second argument is the
previous value of this method, and should usually be called through to
whenever the extended method does not handle the call itself.
Similarly, the loose parser allows plugins to register themselves via
`acorn.pluginsLoose`. The extension mechanism is the same as for the
normal parser:
```javascript
looseParser.extend("readToken", function(nextMethod) {
return function() {
console.log("Reading a token in the loose parser!")
return nextMethod.call(this)
}
})
```
### Existing plugins
- [`acorn-jsx`](https://github.com/RReverser/acorn-jsx): Parse [Facebook JSX syntax extensions](https://github.com/facebook/jsx)
- [`acorn-objj`](https://github.com/cappuccino/acorn-objj): [Objective-J](http://www.cappuccino-project.org/learn/objective-j.html) language parser built as Acorn plugin
Plugins for ECMAScript proposals:
- [`acorn-stage3`](https://github.com/acornjs/acorn-stage3): Parse most stage 3 proposals, bundling:
- [`acorn-async-iteration`](https://github.com/acornjs/acorn-async-iteration): Parse [async iteration proposal](https://github.com/tc39/proposal-async-iteration)
- [`acorn-bigint`](https://github.com/acornjs/acorn-bigint): Parse [BigInt proposal](https://github.com/tc39/proposal-bigint)
- [`acorn-class-fields`](https://github.com/acornjs/acorn-class-fields): Parse [class fields proposal](https://github.com/tc39/proposal-class-fields)
- [`acorn-dynamic-import`](https://github.com/kesne/acorn-dynamic-import): Parse [import() proposal](https://github.com/tc39/proposal-dynamic-import)
- [`acorn-import-meta`](https://github.com/acornjs/acorn-import-meta): Parse [import.meta proposal](https://github.com/tc39/proposal-import-meta)
- [`acorn-numeric-separator`](https://github.com/acornjs/acorn-numeric-separator): Parse [numeric separator proposal](https://github.com/tc39/proposal-numeric-separator)
- [`acorn-optional-catch-binding`](https://github.com/acornjs/acorn-optional-catch-binding): Parse [optional catch binding proposal](https://github.com/tc39/proposal-optional-catch-binding)
- [`acorn-private-methods`](https://github.com/acornjs/acorn-private-methods): parse [private methods, getters and setters proposal](https://github.com/tc39/proposal-private-methods)
- [`acorn5-object-spread`](https://github.com/adrianheine/acorn5-object-spread): Parse [Object Rest/Spread Properties proposal](https://github.com/tc39/proposal-object-rest-spread)
- [`acorn-object-rest-spread`](https://github.com/victor-homyakov/acorn-object-rest-spread): Parse [Object Rest/Spread Properties proposal](https://github.com/tc39/proposal-object-rest-spread)
- [`acorn-es7`](https://github.com/angelozerr/acorn-es7): Parse [decorator syntax proposal](https://github.com/wycats/javascript-decorators)
- [`acorn-static-class-property-initializer`](https://github.com/victor-homyakov/acorn-static-class-property-initializer): Partial support for static class properties from [ES Class Fields & Static Properties Proposal](https://github.com/tc39/proposal-class-public-fields) to support static property initializers in [React components written as ES6+ classes](https://babeljs.io/blog/2015/07/07/react-on-es6-plus)

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#!/usr/bin/env node
'use strict';
var path = require('path');
var fs = require('fs');
var acorn = require('../dist/acorn.js');
var infile;
var forceFile;
var silent = false;
var compact = false;
var tokenize = false;
var options = {};
function help(status) {
var print = (status === 0) ? console.log : console.error;
print("usage: " + path.basename(process.argv[1]) + " [--ecma3|--ecma5|--ecma6|--ecma7|--ecma8|--ecma9|...|--ecma2015|--ecma2016|--ecma2017|--ecma2018|...]");
print(" [--tokenize] [--locations] [---allow-hash-bang] [--compact] [--silent] [--module] [--help] [--] [infile]");
process.exit(status);
}
for (var i = 2; i < process.argv.length; ++i) {
var arg = process.argv[i];
if ((arg === "-" || arg[0] !== "-") && !infile) { infile = arg; }
else if (arg === "--" && !infile && i + 2 === process.argv.length) { forceFile = infile = process.argv[++i]; }
else if (arg === "--locations") { options.locations = true; }
else if (arg === "--allow-hash-bang") { options.allowHashBang = true; }
else if (arg === "--silent") { silent = true; }
else if (arg === "--compact") { compact = true; }
else if (arg === "--help") { help(0); }
else if (arg === "--tokenize") { tokenize = true; }
else if (arg === "--module") { options.sourceType = "module"; }
else {
var match = arg.match(/^--ecma(\d+)$/);
if (match)
{ options.ecmaVersion = +match[1]; }
else
{ help(1); }
}
}
function run(code) {
var result;
try {
if (!tokenize) {
result = acorn.parse(code, options);
} else {
result = [];
var tokenizer$$1 = acorn.tokenizer(code, options), token;
do {
token = tokenizer$$1.getToken();
result.push(token);
} while (token.type !== acorn.tokTypes.eof)
}
} catch (e) {
console.error(e.message);
process.exit(1);
}
if (!silent) { console.log(JSON.stringify(result, null, compact ? null : 2)); }
}
if (forceFile || infile && infile !== "-") {
run(fs.readFileSync(infile, "utf8"));
} else {
var code = "";
process.stdin.resume();
process.stdin.on("data", function (chunk) { return code += chunk; });
process.stdin.on("end", function () { return run(code); });
}

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#!/usr/bin/env node
'use strict';
require('./_acorn.js');

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const fs = require("fs")
const path = require("path")
const run = require("test262-parser-runner")
const parse = require("..").parse
const unsupportedFeatures = [
"BigInt",
"class-fields",
"class-fields-private",
"class-fields-public",
"numeric-separator-literal"
];
run(
(content, {sourceType}) => parse(content, {sourceType, ecmaVersion: 10}),
{
testsDirectory: path.dirname(require.resolve("test262/package.json")),
skip: test => (test.attrs.features && unsupportedFeatures.some(f => test.attrs.features.includes(f))),
whitelist: fs.readFileSync("./bin/test262.whitelist", "utf8").split("\n").filter(v => v)
}
)

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language/statements/while/let-identifier-with-newline.js (default)
language/statements/with/labelled-fn-stmt.js (default)
language/statements/with/let-block-with-newline.js (default)
language/statements/with/let-identifier-with-newline.js (default)
language/white-space/mongolian-vowel-separator.js (default)
language/white-space/mongolian-vowel-separator.js (strict mode)

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node_modules/acorn/dist/walk.es.js generated vendored
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// AST walker module for Mozilla Parser API compatible trees
// A simple walk is one where you simply specify callbacks to be
// called on specific nodes. The last two arguments are optional. A
// simple use would be
//
// walk.simple(myTree, {
// Expression: function(node) { ... }
// });
//
// to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression,
// Statement, and ScopeBody, which denote categories of nodes.
//
// The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial
// state.
function simple(node, visitors, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
baseVisitor[type](node, st, c);
if (found) { found(node, st); }
})(node, state, override);
}
// An ancestor walk keeps an array of ancestor nodes (including the
// current node) and passes them to the callback as third parameter
// (and also as state parameter when no other state is present).
function ancestor(node, visitors, baseVisitor, state) {
var ancestors = [];
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (found) { found(node, st || ancestors, ancestors); }
if (isNew) { ancestors.pop(); }
})(node, state);
}
// A recursive walk is one where your functions override the default
// walkers. They can modify and replace the state parameter that's
// threaded through the walk, and can opt how and whether to walk
// their child nodes (by calling their third argument on these
// nodes).
function recursive(node, state, funcs, baseVisitor, override) {
var visitor = funcs ? make(funcs, baseVisitor || undefined) : baseVisitor;(function c(node, st, override) {
visitor[override || node.type](node, st, c);
})(node, state, override);
}
function makeTest(test) {
if (typeof test === "string")
{ return function (type) { return type === test; } }
else if (!test)
{ return function () { return true; } }
else
{ return test }
}
var Found = function Found(node, state) { this.node = node; this.state = state; };
// A full walk triggers the callback on each node
function full(node, callback, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type;
baseVisitor[type](node, st, c);
if (!override) { callback(node, st, type); }
})(node, state, override);
}
// An fullAncestor walk is like an ancestor walk, but triggers
// the callback on each node
function fullAncestor(node, callback, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
var ancestors = [];(function c(node, st, override) {
var type = override || node.type;
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (!override) { callback(node, st || ancestors, ancestors, type); }
if (isNew) { ancestors.pop(); }
})(node, state);
}
// Find a node with a given start, end, and type (all are optional,
// null can be used as wildcard). Returns a {node, state} object, or
// undefined when it doesn't find a matching node.
function findNodeAt(node, start, end, test, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
test = makeTest(test);
try {
(function c(node, st, override) {
var type = override || node.type;
if ((start == null || node.start <= start) &&
(end == null || node.end >= end))
{ baseVisitor[type](node, st, c); }
if ((start == null || node.start === start) &&
(end == null || node.end === end) &&
test(type, node))
{ throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the innermost node of a given type that contains the given
// position. Interface similar to findNodeAt.
function findNodeAround(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
var type = override || node.type;
if (node.start > pos || node.end < pos) { return }
baseVisitor[type](node, st, c);
if (test(type, node)) { throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node after a given position.
function findNodeAfter(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
if (node.end < pos) { return }
var type = override || node.type;
if (node.start >= pos && test(type, node)) { throw new Found(node, st) }
baseVisitor[type](node, st, c);
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node before a given position.
function findNodeBefore(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
var max;(function c(node, st, override) {
if (node.start > pos) { return }
var type = override || node.type;
if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
{ max = new Found(node, st); }
baseVisitor[type](node, st, c);
})(node, state);
return max
}
// Fallback to an Object.create polyfill for older environments.
var create = Object.create || function(proto) {
function Ctor() {}
Ctor.prototype = proto;
return new Ctor
};
// Used to create a custom walker. Will fill in all missing node
// type properties with the defaults.
function make(funcs, baseVisitor) {
var visitor = create(baseVisitor || base);
for (var type in funcs) { visitor[type] = funcs[type]; }
return visitor
}
function skipThrough(node, st, c) { c(node, st); }
function ignore(_node, _st, _c) {}
// Node walkers.
var base = {};
base.Program = base.BlockStatement = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var stmt = list[i];
c(stmt, st, "Statement");
}
};
base.Statement = skipThrough;
base.EmptyStatement = ignore;
base.ExpressionStatement = base.ParenthesizedExpression =
function (node, st, c) { return c(node.expression, st, "Expression"); };
base.IfStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Statement");
if (node.alternate) { c(node.alternate, st, "Statement"); }
};
base.LabeledStatement = function (node, st, c) { return c(node.body, st, "Statement"); };
base.BreakStatement = base.ContinueStatement = ignore;
base.WithStatement = function (node, st, c) {
c(node.object, st, "Expression");
c(node.body, st, "Statement");
};
base.SwitchStatement = function (node, st, c) {
c(node.discriminant, st, "Expression");
for (var i = 0, list = node.cases; i < list.length; i += 1) {
var cs = list[i];
if (cs.test) { c(cs.test, st, "Expression"); }
for (var i$1 = 0, list$1 = cs.consequent; i$1 < list$1.length; i$1 += 1)
{
var cons = list$1[i$1];
c(cons, st, "Statement");
}
}
};
base.SwitchCase = function (node, st, c) {
if (node.test) { c(node.test, st, "Expression"); }
for (var i = 0, list = node.consequent; i < list.length; i += 1)
{
var cons = list[i];
c(cons, st, "Statement");
}
};
base.ReturnStatement = base.YieldExpression = base.AwaitExpression = function (node, st, c) {
if (node.argument) { c(node.argument, st, "Expression"); }
};
base.ThrowStatement = base.SpreadElement =
function (node, st, c) { return c(node.argument, st, "Expression"); };
base.TryStatement = function (node, st, c) {
c(node.block, st, "Statement");
if (node.handler) { c(node.handler, st); }
if (node.finalizer) { c(node.finalizer, st, "Statement"); }
};
base.CatchClause = function (node, st, c) {
if (node.param) { c(node.param, st, "Pattern"); }
c(node.body, st, "ScopeBody");
};
base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.body, st, "Statement");
};
base.ForStatement = function (node, st, c) {
if (node.init) { c(node.init, st, "ForInit"); }
if (node.test) { c(node.test, st, "Expression"); }
if (node.update) { c(node.update, st, "Expression"); }
c(node.body, st, "Statement");
};
base.ForInStatement = base.ForOfStatement = function (node, st, c) {
c(node.left, st, "ForInit");
c(node.right, st, "Expression");
c(node.body, st, "Statement");
};
base.ForInit = function (node, st, c) {
if (node.type === "VariableDeclaration") { c(node, st); }
else { c(node, st, "Expression"); }
};
base.DebuggerStatement = ignore;
base.FunctionDeclaration = function (node, st, c) { return c(node, st, "Function"); };
base.VariableDeclaration = function (node, st, c) {
for (var i = 0, list = node.declarations; i < list.length; i += 1)
{
var decl = list[i];
c(decl, st);
}
};
base.VariableDeclarator = function (node, st, c) {
c(node.id, st, "Pattern");
if (node.init) { c(node.init, st, "Expression"); }
};
base.Function = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
for (var i = 0, list = node.params; i < list.length; i += 1)
{
var param = list[i];
c(param, st, "Pattern");
}
c(node.body, st, node.expression ? "ScopeExpression" : "ScopeBody");
};
// FIXME drop these node types in next major version
// (They are awkward, and in ES6 every block can be a scope.)
base.ScopeBody = function (node, st, c) { return c(node, st, "Statement"); };
base.ScopeExpression = function (node, st, c) { return c(node, st, "Expression"); };
base.Pattern = function (node, st, c) {
if (node.type === "Identifier")
{ c(node, st, "VariablePattern"); }
else if (node.type === "MemberExpression")
{ c(node, st, "MemberPattern"); }
else
{ c(node, st); }
};
base.VariablePattern = ignore;
base.MemberPattern = skipThrough;
base.RestElement = function (node, st, c) { return c(node.argument, st, "Pattern"); };
base.ArrayPattern = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Pattern"); }
}
};
base.ObjectPattern = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1) {
var prop = list[i];
if (prop.type === "Property") {
if (prop.computed) { c(prop.key, st, "Expression"); }
c(prop.value, st, "Pattern");
} else if (prop.type === "RestElement") {
c(prop.argument, st, "Pattern");
}
}
};
base.Expression = skipThrough;
base.ThisExpression = base.Super = base.MetaProperty = ignore;
base.ArrayExpression = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Expression"); }
}
};
base.ObjectExpression = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1)
{
var prop = list[i];
c(prop, st);
}
};
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = base.TemplateLiteral = function (node, st, c) {
for (var i = 0, list = node.expressions; i < list.length; i += 1)
{
var expr = list[i];
c(expr, st, "Expression");
}
};
base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
c(node.argument, st, "Expression");
};
base.BinaryExpression = base.LogicalExpression = function (node, st, c) {
c(node.left, st, "Expression");
c(node.right, st, "Expression");
};
base.AssignmentExpression = base.AssignmentPattern = function (node, st, c) {
c(node.left, st, "Pattern");
c(node.right, st, "Expression");
};
base.ConditionalExpression = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Expression");
c(node.alternate, st, "Expression");
};
base.NewExpression = base.CallExpression = function (node, st, c) {
c(node.callee, st, "Expression");
if (node.arguments)
{ for (var i = 0, list = node.arguments; i < list.length; i += 1)
{
var arg = list[i];
c(arg, st, "Expression");
} }
};
base.MemberExpression = function (node, st, c) {
c(node.object, st, "Expression");
if (node.computed) { c(node.property, st, "Expression"); }
};
base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
if (node.declaration)
{ c(node.declaration, st, node.type === "ExportNamedDeclaration" || node.declaration.id ? "Statement" : "Expression"); }
if (node.source) { c(node.source, st, "Expression"); }
};
base.ExportAllDeclaration = function (node, st, c) {
c(node.source, st, "Expression");
};
base.ImportDeclaration = function (node, st, c) {
for (var i = 0, list = node.specifiers; i < list.length; i += 1)
{
var spec = list[i];
c(spec, st);
}
c(node.source, st, "Expression");
};
base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = ignore;
base.TaggedTemplateExpression = function (node, st, c) {
c(node.tag, st, "Expression");
c(node.quasi, st, "Expression");
};
base.ClassDeclaration = base.ClassExpression = function (node, st, c) { return c(node, st, "Class"); };
base.Class = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
if (node.superClass) { c(node.superClass, st, "Expression"); }
c(node.body, st);
};
base.ClassBody = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var elt = list[i];
c(elt, st);
}
};
base.MethodDefinition = base.Property = function (node, st, c) {
if (node.computed) { c(node.key, st, "Expression"); }
c(node.value, st, "Expression");
};
export { simple, ancestor, recursive, full, fullAncestor, findNodeAt, findNodeAround, findNodeAfter, findNodeBefore, make, base };

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node_modules/acorn/dist/walk.js generated vendored
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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.acorn = global.acorn || {}, global.acorn.walk = {})));
}(this, (function (exports) { 'use strict';
// AST walker module for Mozilla Parser API compatible trees
// A simple walk is one where you simply specify callbacks to be
// called on specific nodes. The last two arguments are optional. A
// simple use would be
//
// walk.simple(myTree, {
// Expression: function(node) { ... }
// });
//
// to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression,
// Statement, and ScopeBody, which denote categories of nodes.
//
// The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial
// state.
function simple(node, visitors, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
baseVisitor[type](node, st, c);
if (found) { found(node, st); }
})(node, state, override);
}
// An ancestor walk keeps an array of ancestor nodes (including the
// current node) and passes them to the callback as third parameter
// (and also as state parameter when no other state is present).
function ancestor(node, visitors, baseVisitor, state) {
var ancestors = [];
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (found) { found(node, st || ancestors, ancestors); }
if (isNew) { ancestors.pop(); }
})(node, state);
}
// A recursive walk is one where your functions override the default
// walkers. They can modify and replace the state parameter that's
// threaded through the walk, and can opt how and whether to walk
// their child nodes (by calling their third argument on these
// nodes).
function recursive(node, state, funcs, baseVisitor, override) {
var visitor = funcs ? make(funcs, baseVisitor || undefined) : baseVisitor;(function c(node, st, override) {
visitor[override || node.type](node, st, c);
})(node, state, override);
}
function makeTest(test) {
if (typeof test === "string")
{ return function (type) { return type === test; } }
else if (!test)
{ return function () { return true; } }
else
{ return test }
}
var Found = function Found(node, state) { this.node = node; this.state = state; };
// A full walk triggers the callback on each node
function full(node, callback, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type;
baseVisitor[type](node, st, c);
if (!override) { callback(node, st, type); }
})(node, state, override);
}
// An fullAncestor walk is like an ancestor walk, but triggers
// the callback on each node
function fullAncestor(node, callback, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
var ancestors = [];(function c(node, st, override) {
var type = override || node.type;
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (!override) { callback(node, st || ancestors, ancestors, type); }
if (isNew) { ancestors.pop(); }
})(node, state);
}
// Find a node with a given start, end, and type (all are optional,
// null can be used as wildcard). Returns a {node, state} object, or
// undefined when it doesn't find a matching node.
function findNodeAt(node, start, end, test, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
test = makeTest(test);
try {
(function c(node, st, override) {
var type = override || node.type;
if ((start == null || node.start <= start) &&
(end == null || node.end >= end))
{ baseVisitor[type](node, st, c); }
if ((start == null || node.start === start) &&
(end == null || node.end === end) &&
test(type, node))
{ throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the innermost node of a given type that contains the given
// position. Interface similar to findNodeAt.
function findNodeAround(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
var type = override || node.type;
if (node.start > pos || node.end < pos) { return }
baseVisitor[type](node, st, c);
if (test(type, node)) { throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node after a given position.
function findNodeAfter(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
if (node.end < pos) { return }
var type = override || node.type;
if (node.start >= pos && test(type, node)) { throw new Found(node, st) }
baseVisitor[type](node, st, c);
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node before a given position.
function findNodeBefore(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
var max;(function c(node, st, override) {
if (node.start > pos) { return }
var type = override || node.type;
if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
{ max = new Found(node, st); }
baseVisitor[type](node, st, c);
})(node, state);
return max
}
// Fallback to an Object.create polyfill for older environments.
var create = Object.create || function(proto) {
function Ctor() {}
Ctor.prototype = proto;
return new Ctor
};
// Used to create a custom walker. Will fill in all missing node
// type properties with the defaults.
function make(funcs, baseVisitor) {
var visitor = create(baseVisitor || base);
for (var type in funcs) { visitor[type] = funcs[type]; }
return visitor
}
function skipThrough(node, st, c) { c(node, st); }
function ignore(_node, _st, _c) {}
// Node walkers.
var base = {};
base.Program = base.BlockStatement = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var stmt = list[i];
c(stmt, st, "Statement");
}
};
base.Statement = skipThrough;
base.EmptyStatement = ignore;
base.ExpressionStatement = base.ParenthesizedExpression =
function (node, st, c) { return c(node.expression, st, "Expression"); };
base.IfStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Statement");
if (node.alternate) { c(node.alternate, st, "Statement"); }
};
base.LabeledStatement = function (node, st, c) { return c(node.body, st, "Statement"); };
base.BreakStatement = base.ContinueStatement = ignore;
base.WithStatement = function (node, st, c) {
c(node.object, st, "Expression");
c(node.body, st, "Statement");
};
base.SwitchStatement = function (node, st, c) {
c(node.discriminant, st, "Expression");
for (var i = 0, list = node.cases; i < list.length; i += 1) {
var cs = list[i];
if (cs.test) { c(cs.test, st, "Expression"); }
for (var i$1 = 0, list$1 = cs.consequent; i$1 < list$1.length; i$1 += 1)
{
var cons = list$1[i$1];
c(cons, st, "Statement");
}
}
};
base.SwitchCase = function (node, st, c) {
if (node.test) { c(node.test, st, "Expression"); }
for (var i = 0, list = node.consequent; i < list.length; i += 1)
{
var cons = list[i];
c(cons, st, "Statement");
}
};
base.ReturnStatement = base.YieldExpression = base.AwaitExpression = function (node, st, c) {
if (node.argument) { c(node.argument, st, "Expression"); }
};
base.ThrowStatement = base.SpreadElement =
function (node, st, c) { return c(node.argument, st, "Expression"); };
base.TryStatement = function (node, st, c) {
c(node.block, st, "Statement");
if (node.handler) { c(node.handler, st); }
if (node.finalizer) { c(node.finalizer, st, "Statement"); }
};
base.CatchClause = function (node, st, c) {
if (node.param) { c(node.param, st, "Pattern"); }
c(node.body, st, "ScopeBody");
};
base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.body, st, "Statement");
};
base.ForStatement = function (node, st, c) {
if (node.init) { c(node.init, st, "ForInit"); }
if (node.test) { c(node.test, st, "Expression"); }
if (node.update) { c(node.update, st, "Expression"); }
c(node.body, st, "Statement");
};
base.ForInStatement = base.ForOfStatement = function (node, st, c) {
c(node.left, st, "ForInit");
c(node.right, st, "Expression");
c(node.body, st, "Statement");
};
base.ForInit = function (node, st, c) {
if (node.type === "VariableDeclaration") { c(node, st); }
else { c(node, st, "Expression"); }
};
base.DebuggerStatement = ignore;
base.FunctionDeclaration = function (node, st, c) { return c(node, st, "Function"); };
base.VariableDeclaration = function (node, st, c) {
for (var i = 0, list = node.declarations; i < list.length; i += 1)
{
var decl = list[i];
c(decl, st);
}
};
base.VariableDeclarator = function (node, st, c) {
c(node.id, st, "Pattern");
if (node.init) { c(node.init, st, "Expression"); }
};
base.Function = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
for (var i = 0, list = node.params; i < list.length; i += 1)
{
var param = list[i];
c(param, st, "Pattern");
}
c(node.body, st, node.expression ? "ScopeExpression" : "ScopeBody");
};
// FIXME drop these node types in next major version
// (They are awkward, and in ES6 every block can be a scope.)
base.ScopeBody = function (node, st, c) { return c(node, st, "Statement"); };
base.ScopeExpression = function (node, st, c) { return c(node, st, "Expression"); };
base.Pattern = function (node, st, c) {
if (node.type === "Identifier")
{ c(node, st, "VariablePattern"); }
else if (node.type === "MemberExpression")
{ c(node, st, "MemberPattern"); }
else
{ c(node, st); }
};
base.VariablePattern = ignore;
base.MemberPattern = skipThrough;
base.RestElement = function (node, st, c) { return c(node.argument, st, "Pattern"); };
base.ArrayPattern = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Pattern"); }
}
};
base.ObjectPattern = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1) {
var prop = list[i];
if (prop.type === "Property") {
if (prop.computed) { c(prop.key, st, "Expression"); }
c(prop.value, st, "Pattern");
} else if (prop.type === "RestElement") {
c(prop.argument, st, "Pattern");
}
}
};
base.Expression = skipThrough;
base.ThisExpression = base.Super = base.MetaProperty = ignore;
base.ArrayExpression = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Expression"); }
}
};
base.ObjectExpression = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1)
{
var prop = list[i];
c(prop, st);
}
};
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = base.TemplateLiteral = function (node, st, c) {
for (var i = 0, list = node.expressions; i < list.length; i += 1)
{
var expr = list[i];
c(expr, st, "Expression");
}
};
base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
c(node.argument, st, "Expression");
};
base.BinaryExpression = base.LogicalExpression = function (node, st, c) {
c(node.left, st, "Expression");
c(node.right, st, "Expression");
};
base.AssignmentExpression = base.AssignmentPattern = function (node, st, c) {
c(node.left, st, "Pattern");
c(node.right, st, "Expression");
};
base.ConditionalExpression = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Expression");
c(node.alternate, st, "Expression");
};
base.NewExpression = base.CallExpression = function (node, st, c) {
c(node.callee, st, "Expression");
if (node.arguments)
{ for (var i = 0, list = node.arguments; i < list.length; i += 1)
{
var arg = list[i];
c(arg, st, "Expression");
} }
};
base.MemberExpression = function (node, st, c) {
c(node.object, st, "Expression");
if (node.computed) { c(node.property, st, "Expression"); }
};
base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
if (node.declaration)
{ c(node.declaration, st, node.type === "ExportNamedDeclaration" || node.declaration.id ? "Statement" : "Expression"); }
if (node.source) { c(node.source, st, "Expression"); }
};
base.ExportAllDeclaration = function (node, st, c) {
c(node.source, st, "Expression");
};
base.ImportDeclaration = function (node, st, c) {
for (var i = 0, list = node.specifiers; i < list.length; i += 1)
{
var spec = list[i];
c(spec, st);
}
c(node.source, st, "Expression");
};
base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = ignore;
base.TaggedTemplateExpression = function (node, st, c) {
c(node.tag, st, "Expression");
c(node.quasi, st, "Expression");
};
base.ClassDeclaration = base.ClassExpression = function (node, st, c) { return c(node, st, "Class"); };
base.Class = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
if (node.superClass) { c(node.superClass, st, "Expression"); }
c(node.body, st);
};
base.ClassBody = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var elt = list[i];
c(elt, st);
}
};
base.MethodDefinition = base.Property = function (node, st, c) {
if (node.computed) { c(node.key, st, "Expression"); }
c(node.value, st, "Expression");
};
exports.simple = simple;
exports.ancestor = ancestor;
exports.recursive = recursive;
exports.full = full;
exports.fullAncestor = fullAncestor;
exports.findNodeAt = findNodeAt;
exports.findNodeAround = findNodeAround;
exports.findNodeAfter = findNodeAfter;
exports.findNodeBefore = findNodeBefore;
exports.make = make;
exports.base = base;
Object.defineProperty(exports, '__esModule', { value: true });
})));

328
node_modules/acorn/package.json generated vendored
View file

@ -1,328 +0,0 @@
{
"_args": [
[
"acorn@5.7.3",
"/Users/eric/repos/actions/setup-node"
]
],
"_development": true,
"_from": "acorn@5.7.3",
"_id": "acorn@5.7.3",
"_inBundle": false,
"_integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
"_location": "/acorn",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "acorn@5.7.3",
"name": "acorn",
"escapedName": "acorn",
"rawSpec": "5.7.3",
"saveSpec": null,
"fetchSpec": "5.7.3"
},
"_requiredBy": [
"/jsdom"
],
"_resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
"_spec": "5.7.3",
"_where": "/Users/eric/repos/actions/setup-node",
"bin": {
"acorn": "./bin/acorn"
},
"bugs": {
"url": "https://github.com/acornjs/acorn/issues"
},
"contributors": [
{
"name": "List of Acorn contributors. Updated before every release."
},
{
"name": "Adrian Heine"
},
{
"name": "Adrian Rakovsky"
},
{
"name": "Alistair Braidwood"
},
{
"name": "Amila Welihinda"
},
{
"name": "Andres Suarez"
},
{
"name": "Angelo"
},
{
"name": "Aparajita Fishman"
},
{
"name": "Arian Stolwijk"
},
{
"name": "Artem Govorov"
},
{
"name": "Boopesh Mahendran"
},
{
"name": "Bradley Heinz"
},
{
"name": "Brandon Mills"
},
{
"name": "Charles Hughes"
},
{
"name": "Charmander"
},
{
"name": "Chris McKnight"
},
{
"name": "Conrad Irwin"
},
{
"name": "Daniel Tschinder"
},
{
"name": "David Bonnet"
},
{
"name": "Domenico Matteo"
},
{
"name": "ehmicky"
},
{
"name": "Eugene Obrezkov"
},
{
"name": "Felix Maier"
},
{
"name": "Forbes Lindesay"
},
{
"name": "Gilad Peleg"
},
{
"name": "impinball"
},
{
"name": "Ingvar Stepanyan"
},
{
"name": "Jackson Ray Hamilton"
},
{
"name": "Jesse McCarthy"
},
{
"name": "Jiaxing Wang"
},
{
"name": "Joel Kemp"
},
{
"name": "Johannes Herr"
},
{
"name": "John-David Dalton"
},
{
"name": "Jordan Klassen"
},
{
"name": "Jürg Lehni"
},
{
"name": "Kai Cataldo"
},
{
"name": "keeyipchan"
},
{
"name": "Keheliya Gallaba"
},
{
"name": "Kevin Irish"
},
{
"name": "Kevin Kwok"
},
{
"name": "krator"
},
{
"name": "laosb"
},
{
"name": "luckyzeng"
},
{
"name": "Marek"
},
{
"name": "Marijn Haverbeke"
},
{
"name": "Martin Carlberg"
},
{
"name": "Mat Garcia"
},
{
"name": "Mathias Bynens"
},
{
"name": "Mathieu 'p01' Henri"
},
{
"name": "Matthew Bastien"
},
{
"name": "Max Schaefer"
},
{
"name": "Max Zerzouri"
},
{
"name": "Mihai Bazon"
},
{
"name": "Mike Rennie"
},
{
"name": "naoh"
},
{
"name": "Nicholas C. Zakas"
},
{
"name": "Nick Fitzgerald"
},
{
"name": "Olivier Thomann"
},
{
"name": "Oskar Schöldström"
},
{
"name": "Paul Harper"
},
{
"name": "Peter Rust"
},
{
"name": "PlNG"
},
{
"name": "Prayag Verma"
},
{
"name": "ReadmeCritic"
},
{
"name": "r-e-d"
},
{
"name": "Renée Kooi"
},
{
"name": "Richard Gibson"
},
{
"name": "Rich Harris"
},
{
"name": "Sebastian McKenzie"
},
{
"name": "Shahar Soel"
},
{
"name": "Sheel Bedi"
},
{
"name": "Simen Bekkhus"
},
{
"name": "Teddy Katz"
},
{
"name": "Timothy Gu"
},
{
"name": "Toru Nagashima"
},
{
"name": "Victor Homyakov"
},
{
"name": "Wexpo Lyu"
},
{
"name": "zsjforcn"
}
],
"description": "ECMAScript parser",
"devDependencies": {
"eslint": "^4.10.0",
"eslint-config-standard": "^10.2.1",
"eslint-plugin-import": "^2.2.0",
"eslint-plugin-node": "^5.2.1",
"eslint-plugin-promise": "^3.5.0",
"eslint-plugin-standard": "^3.0.1",
"rollup": "^0.45.0",
"rollup-plugin-buble": "^0.16.0",
"test262": "git+https://github.com/tc39/test262.git#3bfad28cc302fd4455badcfcbca7c5bb7ce41a72",
"test262-parser-runner": "^0.4.0",
"unicode-11.0.0": "^0.7.7"
},
"engines": {
"node": ">=0.4.0"
},
"homepage": "https://github.com/acornjs/acorn",
"license": "MIT",
"main": "dist/acorn.js",
"maintainers": [
{
"name": "Marijn Haverbeke",
"email": "marijnh@gmail.com",
"url": "http://marijnhaverbeke.nl"
},
{
"name": "Ingvar Stepanyan",
"email": "me@rreverser.com",
"url": "http://rreverser.com/"
},
{
"name": "Adrian Heine",
"email": "http://adrianheine.de"
}
],
"module": "dist/acorn.es.js",
"name": "acorn",
"repository": {
"type": "git",
"url": "git+https://github.com/acornjs/acorn.git"
},
"scripts": {
"build": "npm run build:main && npm run build:walk && npm run build:loose && npm run build:bin",
"build:bin": "rollup -c rollup/config.bin.js",
"build:loose": "rollup -c rollup/config.loose.js && rollup -c rollup/config.loose_es.js",
"build:main": "rollup -c rollup/config.main.js",
"build:walk": "rollup -c rollup/config.walk.js",
"lint": "eslint src/",
"prepare": "npm run build && node test/run.js && node test/lint.js",
"pretest": "npm run build:main && npm run build:loose",
"test": "node test/run.js && node test/lint.js",
"test:test262": "node bin/run_test262.js"
},
"version": "5.7.3"
}