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deps: update acorn to 6.0.7

Browse Source 
acorn and acorn-walk are now published as two different packages. Put
them both in subdirectories of `deps/acorn`.
Adapt the REPL's recoverable error detection to use the new API for
extending acorn parsers.

PR-URL: https://github.com/nodejs/node/pull/25844
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
This commit is contained in:
Michaël Zasso 2019-01-31 08:36:48 +01:00
parent 39171d755d
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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
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
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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# 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 comment’s 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 node’s `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/2015/06/07/react-on-es6-plus)

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## 6.1.0 (2018-09-28)
### New features
The walker now walks `TemplateElement` nodes.
## 6.0.1 (2018-09-14)
### Bug fixes
Fix bad "main" field in package.json.
## 6.0.0 (2018-09-14)
### Breaking changes
This is now a separate package, `acorn-walk`, rather than part of the main `acorn` package.
The `ScopeBody` and `ScopeExpression` meta-node-types are no longer supported.
## 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.
## 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.
## 5.5.1 (2018-03-06)
### Bug fixes
Fix regression in walker causing property values in object patterns to be walked as expressions.
## 5.5.0 (2018-02-27)
### Bug fixes
Support object spread in the AST walker.
## 5.4.1 (2018-02-02)
### Bug fixes
5.4.0 somehow accidentally included an old version of walk.js.
## 5.2.0 (2017-10-30)
### Bug fixes
The `full` and `fullAncestor` walkers no longer visit nodes multiple times.
## 5.1.0 (2017-07-05)
### New features
New walker functions `full` and `fullAncestor`.
## 3.2.0 (2016-06-07)
### New features
Make it possible to use `visit.ancestor` with a walk state.
## 3.1.0 (2016-04-18)
### New features
The walker now allows defining handlers for `CatchClause` nodes.
## 2.5.2 (2015-10-27)
### Fixes
Fix bug where the walker walked an exported `let` statement as an expression.

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# Acorn AST walker
An abstract syntax tree walker for the
[ESTree](https://github.com/estree/estree) format.
## 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 from [`npm`](https://www.npmjs.com/):
```sh
npm install acorn-walk
```
Alternately, you can download the source and build acorn yourself:
```sh
git clone https://github.com/acornjs/acorn.git
cd acorn
npm install
```
## Interface
An algorithm for recursing through a syntax tree is stored as an
object, with a property for each tree node type holding a function
that will recurse through such a node. There are several ways to run
such a walker.
**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](https://github.com/estree/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-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-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-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).

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@ -15,8 +15,8 @@
// }); // });
// //
// to do something with all expressions. All Parser API node types // to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression, // can be used to identify node types, as well as Expression and
// Statement, and ScopeBody, which denote categories of nodes. // Statement, which denote categories of nodes.
// //
// The base argument can be used to pass a custom (recursive) // The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial // walker, and state can be used to give this walked an initial
@ -245,7 +245,7 @@ base.TryStatement = function (node, st, c) {
}; };
base.CatchClause = function (node, st, c) { base.CatchClause = function (node, st, c) {
if (node.param) { c(node.param, st, "Pattern"); } if (node.param) { c(node.param, st, "Pattern"); }
c(node.body, st, "ScopeBody"); c(node.body, st, "Statement");
}; };
base.WhileStatement = base.DoWhileStatement = function (node, st, c) { base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
c(node.test, st, "Expression"); c(node.test, st, "Expression");
@ -290,12 +290,8 @@ base.Function = function (node, st, c) {
c(param, st, "Pattern"); c(param, st, "Pattern");
} }
c(node.body, st, node.expression ? "ScopeExpression" : "ScopeBody"); c(node.body, st, node.expression ? "Expression" : "Statement");
}; };
// 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) { base.Pattern = function (node, st, c) {
if (node.type === "Identifier") if (node.type === "Identifier")
@ -346,7 +342,7 @@ base.ObjectExpression = function (node, st, c) {
} }
}; };
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration; base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = base.TemplateLiteral = function (node, st, c) { base.SequenceExpression = function (node, st, c) {
for (var i = 0, list = node.expressions; i < list.length; i += 1) for (var i = 0, list = node.expressions; i < list.length; i += 1)
{ {
var expr = list[i]; var expr = list[i];
@ -354,6 +350,22 @@ base.SequenceExpression = base.TemplateLiteral = function (node, st, c) {
c(expr, st, "Expression"); c(expr, st, "Expression");
} }
}; };
base.TemplateLiteral = function (node, st, c) {
for (var i = 0, list = node.quasis; i < list.length; i += 1)
{
var quasi = list[i];
c(quasi, st);
}
for (var i$1 = 0, list$1 = node.expressions; i$1 < list$1.length; i$1 += 1)
{
var expr = list$1[i$1];
c(expr, st, "Expression");
}
};
base.TemplateElement = ignore;
base.UnaryExpression = base.UpdateExpression = function (node, st, c) { base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
c(node.argument, st, "Expression"); c(node.argument, st, "Expression");
}; };
@ -441,3 +453,4 @@ exports.base = base;
Object.defineProperty(exports, '__esModule', { value: true }); Object.defineProperty(exports, '__esModule', { value: true });
}))); })));
//# sourceMappingURL=walk.js.map

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@ -9,8 +9,8 @@
// }); // });
// //
// to do something with all expressions. All Parser API node types // to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression, // can be used to identify node types, as well as Expression and
// Statement, and ScopeBody, which denote categories of nodes. // Statement, which denote categories of nodes.
// //
// The base argument can be used to pass a custom (recursive) // The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial // walker, and state can be used to give this walked an initial
@ -239,7 +239,7 @@ base.TryStatement = function (node, st, c) {
}; };
base.CatchClause = function (node, st, c) { base.CatchClause = function (node, st, c) {
if (node.param) { c(node.param, st, "Pattern"); } if (node.param) { c(node.param, st, "Pattern"); }
c(node.body, st, "ScopeBody"); c(node.body, st, "Statement");
}; };
base.WhileStatement = base.DoWhileStatement = function (node, st, c) { base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
c(node.test, st, "Expression"); c(node.test, st, "Expression");
@ -284,12 +284,8 @@ base.Function = function (node, st, c) {
c(param, st, "Pattern"); c(param, st, "Pattern");
} }
c(node.body, st, node.expression ? "ScopeExpression" : "ScopeBody"); c(node.body, st, node.expression ? "Expression" : "Statement");
}; };
// 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) { base.Pattern = function (node, st, c) {
if (node.type === "Identifier") if (node.type === "Identifier")
@ -340,7 +336,7 @@ base.ObjectExpression = function (node, st, c) {
} }
}; };
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration; base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = base.TemplateLiteral = function (node, st, c) { base.SequenceExpression = function (node, st, c) {
for (var i = 0, list = node.expressions; i < list.length; i += 1) for (var i = 0, list = node.expressions; i < list.length; i += 1)
{ {
var expr = list[i]; var expr = list[i];
@ -348,6 +344,22 @@ base.SequenceExpression = base.TemplateLiteral = function (node, st, c) {
c(expr, st, "Expression"); c(expr, st, "Expression");
} }
}; };
base.TemplateLiteral = function (node, st, c) {
for (var i = 0, list = node.quasis; i < list.length; i += 1)
{
var quasi = list[i];
c(quasi, st);
}
for (var i$1 = 0, list$1 = node.expressions; i$1 < list$1.length; i$1 += 1)
{
var expr = list$1[i$1];
c(expr, st, "Expression");
}
};
base.TemplateElement = ignore;
base.UnaryExpression = base.UpdateExpression = function (node, st, c) { base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
c(node.argument, st, "Expression"); c(node.argument, st, "Expression");
}; };
@ -421,3 +433,4 @@ base.MethodDefinition = base.Property = function (node, st, c) {
}; };
export { simple, ancestor, recursive, full, fullAncestor, findNodeAt, findNodeAround, findNodeAfter, findNodeBefore, make, base }; export { simple, ancestor, recursive, full, fullAncestor, findNodeAt, findNodeAround, findNodeAfter, findNodeBefore, make, base };
//# sourceMappingURL=walk.mjs.map

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33
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@ -0,0 +1,33 @@
{
"name": "acorn-walk",
"description": "ECMAScript (ESTree) AST walker",
"homepage": "https://github.com/acornjs/acorn",
"main": "dist/walk.js",
"module": "dist/walk.mjs",
"version": "6.1.1",
"engines": {"node": ">=0.4.0"},
"maintainers": [
{
"name": "Marijn Haverbeke",
"email": "marijnh@gmail.com",
"web": "https://marijnhaverbeke.nl"
},
{
"name": "Ingvar Stepanyan",
"email": "me@rreverser.com",
"web": "https://rreverser.com/"
},
{
"name": "Adrian Heine",
"web": "http://adrianheine.de"
}
],
"repository": {
"type": "git",
"url": "https://github.com/acornjs/acorn.git"
},
"scripts": {
"prepare": "cd ..; npm run build:walk"
},
"license": "MIT"
}

250
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View File

@ -1,3 +1,105 @@
## 6.0.7 (2019-02-04)
### Bug fixes
Check that exported bindings are defined.
Don't treat `\u180e` as a whitespace character.
Check for duplicate parameter names in methods.
Don't allow shorthand properties when they are generators or async methods.
Forbid binding `await` in async arrow function's parameter list.
## 6.0.6 (2019-01-30)
### Bug fixes
The content of class declarations and expressions is now always parsed in strict mode.
Don't allow `let` or `const` to bind the variable name `let`.
Treat class declarations as lexical.
Don't allow a generator function declaration as the sole body of an `if` or `else`.
Ignore `"use strict"` when after an empty statement.
Allow string line continuations with special line terminator characters.
Treat `for` bodies as part of the `for` scope when checking for conflicting bindings.
Fix bug with parsing `yield` in a `for` loop initializer.
Implement special cases around scope checking for functions.
## 6.0.5 (2019-01-02)
### Bug fixes
Fix TypeScript type for `Parser.extend` and add `allowAwaitOutsideFunction` to options type.
Don't treat `let` as a keyword when the next token is `{` on the next line.
Fix bug that broke checking for parentheses around an object pattern in a destructuring assignment when `preserveParens` was on.
## 6.0.4 (2018-11-05)
### Bug fixes
Further improvements to tokenizing regular expressions in corner cases.
## 6.0.3 (2018-11-04)
### Bug fixes
Fix bug in tokenizing an expression-less return followed by a function followed by a regular expression.
Remove stray symlink in the package tarball.
## 6.0.2 (2018-09-26)
### Bug fixes
Fix bug where default expressions could fail to parse inside an object destructuring assignment expression.
## 6.0.1 (2018-09-14)
### Bug fixes
Fix wrong value in `version` export.
## 6.0.0 (2018-09-14)
### Bug fixes
Better handle variable-redefinition checks for catch bindings and functions directly under if statements.
Forbid `new.target` in top-level arrow functions.
Fix issue with parsing a regexp after `yield` in some contexts.
### New features
The package now comes with TypeScript definitions.
### Breaking changes
The default value of the `ecmaVersion` option is now 9 (2018).
Plugins work differently, and will have to be rewritten to work with this version.
The loose parser and walker have been moved into separate packages (`acorn-loose` and `acorn-walk`).
## 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) ## 5.7.2 (2018-08-24)
### Bug fixes ### Bug fixes
@ -8,40 +110,14 @@ 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. 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) ## 5.7.0 (2018-06-15)
### Bug fixes
Fix crash in walker when walking a binding-less catch node.
### New features ### New features
Upgraded to Unicode 11. 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) ## 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 ### New features
Allow U+2028 and U+2029 in string when ECMAVersion >= 10. Allow U+2028 and U+2029 in string when ECMAVersion >= 10.
@ -66,28 +142,16 @@ A republish of the code in 5.5.1 in an attempt to solve an issue with the file t
### Bug fixes ### 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. Fix misleading error message for octal escapes in template strings.
## 5.5.0 (2018-02-27) ## 5.5.0 (2018-02-27)
### Bug fixes
Support object spread in the AST walker.
### New features ### New features
The identifier character categorization is now based on Unicode version 10. The identifier character categorization is now based on Unicode version 10.
Acorn will now validate the content of regular expressions, including new ES9 features. 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) ## 5.4.0 (2018-02-01)
### Bug fixes ### Bug fixes
@ -138,8 +202,6 @@ Fix token context tracking for `class` and `function` in property-name position.
Make sure `%*` isn't parsed as a valid operator. 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. Allow shorthand properties `get` and `set` to be followed by default values.
Disallow `super` when not in callee or object position. Disallow `super` when not in callee or object position.
@ -176,14 +238,10 @@ Don't error when `yield` is used as a property name.
Allow `async` as a shorthand object property. Allow `async` as a shorthand object property.
Make the ES module version of the loose parser actually work.
### New features ### New features
Implement the [template literal revision proposal](https://github.com/tc39/proposal-template-literal-revision) for ES9. 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) ## 5.0.3 (2017-04-01)
### Bug fixes ### Bug fixes
@ -222,26 +280,21 @@ Allow all forms of member expressions to be parenthesized as lvalue.
### Bug fixes ### Bug fixes
Don't expect semicolons after default-exported functions or classes, Don't expect semicolons after default-exported functions or classes, even when they are expressions.
even when they are expressions.
Check for use of `'use strict'` directives in non-simple parameter Check for use of `'use strict'` directives in non-simple parameter functions, even when already in strict mode.
functions, even when already in strict mode.
## 4.0.9 (2017-02-06) ## 4.0.9 (2017-02-06)
### Bug fixes ### Bug fixes
Fix incorrect error raised for parenthesized simple assignment Fix incorrect error raised for parenthesized simple assignment targets, so that `(x) = 1` parses again.
targets, so that `(x) = 1` parses again.
## 4.0.8 (2017-02-03) ## 4.0.8 (2017-02-03)
### Bug fixes ### Bug fixes
Solve spurious parenthesized pattern errors by temporarily erring on Solve spurious parenthesized pattern errors by temporarily erring on the side of accepting programs that our delayed errors don't handle correctly yet.
the side of accepting programs that our delayed errors don't handle
correctly yet.
## 4.0.7 (2017-02-02) ## 4.0.7 (2017-02-02)
@ -249,16 +302,13 @@ correctly yet.
Accept invalidly rejected code like `(x).y = 2` again. Accept invalidly rejected code like `(x).y = 2` again.
Don't raise an error when a function _inside_ strict code has a Don't raise an error when a function _inside_ strict code has a non-simple parameter list.
non-simple parameter list.
## 4.0.6 (2017-02-02) ## 4.0.6 (2017-02-02)
### Bug fixes ### Bug fixes
Fix exponential behavior (manifesting itself as a complete hang for Fix exponential behavior (manifesting itself as a complete hang for even relatively small source files) introduced by the new 'use strict' check.
even relatively small source files) introduced by the new 'use strict'
check.
## 4.0.5 (2017-02-02) ## 4.0.5 (2017-02-02)
@ -280,8 +330,6 @@ Disallow labeled declarations.
### Bug fixes ### 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 Fix crash when `export` was followed by a keyword that can't be
exported. exported.
@ -289,8 +337,7 @@ exported.
### Bug fixes ### Bug fixes
Allow regular function declarations inside single-statement `if` Allow regular function declarations inside single-statement `if` branches in loose mode. Forbid them entirely in strict mode.
branches in loose mode. Forbid them entirely in strict mode.
Properly parse properties named `async` in ES2017 mode. Properly parse properties named `async` in ES2017 mode.
@ -302,8 +349,7 @@ Fix bug where reserved words were broken in ES2017 mode.
Don't ignore period or 'e' characters after octal numbers. Don't ignore period or 'e' characters after octal numbers.
Fix broken parsing for call expressions in default parameter values Fix broken parsing for call expressions in default parameter values of arrow functions.
of arrow functions.
## 4.0.1 (2016-08-08) ## 4.0.1 (2016-08-08)
@ -317,8 +363,7 @@ Fix false positives in duplicated export name errors.
The default `ecmaVersion` option value is now 7. The default `ecmaVersion` option value is now 7.
A number of internal method signatures changed, so plugins might need A number of internal method signatures changed, so plugins might need to be updated.
to be updated.
### Bug fixes ### Bug fixes
@ -326,8 +371,7 @@ The parser now raises errors on duplicated export names.
`arguments` and `eval` can now be used in shorthand properties. `arguments` and `eval` can now be used in shorthand properties.
Duplicate parameter names in non-simple argument lists now always Duplicate parameter names in non-simple argument lists now always produce an error.
produce an error.
### New features ### New features
@ -336,8 +380,7 @@ The `ecmaVersion` option now also accepts year-style version numbers
Support for `async`/`await` syntax when `ecmaVersion` is >= 8. Support for `async`/`await` syntax when `ecmaVersion` is >= 8.
Support for trailing commas in call expressions when `ecmaVersion` Support for trailing commas in call expressions when `ecmaVersion` is >= 8.
is >= 8.
## 3.3.0 (2016-07-25) ## 3.3.0 (2016-07-25)
@ -349,8 +392,7 @@ Fix parser crash when parsing an array pattern with a hole.
### New features ### New features
Implement check against complex argument lists in functions that Implement check against complex argument lists in functions that enable strict mode in ES7.
enable strict mode in ES7.
## 3.2.0 (2016-06-07) ## 3.2.0 (2016-06-07)
@ -361,44 +403,29 @@ environment.
Properly reject shorthand properties whose name is a keyword. Properly reject shorthand properties whose name is a keyword.
Don't crash when the loose parser is called without options object.
### New features ### New features
Visitors created with `visit.make` now have their base as _prototype_, Visitors created with `visit.make` now have their base as _prototype_, rather than copying properties into a fresh object.
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) ## 3.1.0 (2016-04-18)
### Bug fixes ### Bug fixes
Fix issue where the loose parser created invalid TemplateElement nodes Properly tokenize the division operator directly after a function expression.
for unclosed template literals.
Properly tokenize the division operator directly after a function
expression.
Allow trailing comma in destructuring arrays. Allow trailing comma in destructuring arrays.
### New features
The walker now allows defining handlers for `CatchClause` nodes.
## 3.0.4 (2016-02-25) ## 3.0.4 (2016-02-25)
### Fixes ### Fixes
Allow update expressions as left-hand-side of the ES7 exponential Allow update expressions as left-hand-side of the ES7 exponential operator.
operator.
## 3.0.2 (2016-02-10) ## 3.0.2 (2016-02-10)
### Fixes ### Fixes
Fix bug that accidentally made `undefined` a reserved word when Fix bug that accidentally made `undefined` a reserved word when parsing ES7.
parsing ES7.
## 3.0.0 (2016-02-10) ## 3.0.0 (2016-02-10)
@ -406,26 +433,21 @@ parsing ES7.
The default value of the `ecmaVersion` option is now 6 (used to be 5). The default value of the `ecmaVersion` option is now 6 (used to be 5).
Support for comprehension syntax (which was dropped from the draft Support for comprehension syntax (which was dropped from the draft spec) has been removed.
spec) has been removed.
### Fixes ### Fixes
`let` and `yield` are now “contextual keywords”, meaning you can `let` and `yield` are now “contextual keywords”, meaning you can mostly use them as identifiers in ES5 non-strict code.
mostly use them as identifiers in ES5 non-strict code.
A parenthesized class or function expression after `export default` is A parenthesized class or function expression after `export default` is now parsed correctly.
now parsed correctly.
### New features ### New features
When `ecmaVersion` is set to 7, Acorn will parse the exponentiation When `ecmaVersion` is set to 7, Acorn will parse the exponentiation operator (`**`).
operator (`**`).
The identifier character ranges are now based on Unicode 8.0.0. The identifier character ranges are now based on Unicode 8.0.0.
Plugins can now override the `raiseRecoverable` method to override the Plugins can now override the `raiseRecoverable` method to override the way non-critical errors are handled.
way non-critical errors are handled.
## 2.7.0 (2016-01-04) ## 2.7.0 (2016-01-04)
@ -433,25 +455,12 @@ way non-critical errors are handled.
Stop allowing rest parameters in setters. 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 `y` rexexp flag in ES5.
Disallow `\00` and `\000` escapes in strict mode. Disallow `\00` and `\000` escapes in strict mode.
Raise an error when an import name is a reserved word. 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) ## 2.6.2 (2015-11-10)
### Fixes ### Fixes
@ -472,28 +481,17 @@ Forbid using a comma after a rest pattern in an array destructuring.
Support parsing stdin in command-line tool. 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) ## 2.5.0 (2015-10-27)
### Fixes ### Fixes
Fix tokenizer support in the command-line tool. 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. Stop allowing `new.target` outside of functions.
Remove legacy `guard` and `guardedHandler` properties from try nodes. Remove legacy `guard` and `guardedHandler` properties from try nodes.
Stop allowing multiple `__proto__` properties on an object literal in Stop allowing multiple `__proto__` properties on an object literal in strict mode.
strict mode.
Don't allow rest parameters to be non-identifier patterns. Don't allow rest parameters to be non-identifier patterns.

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@ -0,0 +1,19 @@
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
A tiny, fast JavaScript parser written in JavaScript.
## Community
Acorn is open source software released under an
[MIT license](https://github.com/acornjs/acorn/blob/master/acorn/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 from [`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
```
## Interface
**parse**`(input, options)` is the main interface to the library. 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](https://github.com/estree/estree).
```javascript
let acorn = require("acorn");
console.log(acorn.parse("1 + 1"));
```
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 string offset at which the
error occurred, and a `loc` object that contains a `{line, column}`
object referring to that same position.
Options can be provided by passing a second argument, which should be
an object containing any of these fields:
- **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. Other proposed new features can be implemented
through plugins.
- **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 comment’s 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](https://bugzilla.mozilla.org/show_bug.cgi?id=745678)
`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 node’s `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.
**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.
**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.
**getLineInfo**`(input, offset)` can be used to get a `{line,
column}` object for a given program string and offset.
### The `Parser` class
Instances of the **`Parser`** class contain all the state and logic
that drives a parse. It has static methods `parse`,
`parseExpressionAt`, and `tokenizer` that match the top-level
functions by the same name.
When extending the parser with plugins, you need to call these methods
on the extended version of the class. To extend a parser with plugins,
you can use its static `extend` method.
```javascript
var acorn = require("acorn");
var jsx = require("acorn-jsx");
var JSXParser = acorn.Parser.extend(jsx());
JSXParser.parse("foo(<bar/>)");
```
The `extend` method takes any number of plugin values, and returns a
new `Parser` class that includes the extra parser logic provided by
the plugins.
## 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 9.
- `--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.
## Existing plugins
- [`acorn-jsx`](https://github.com/RReverser/acorn-jsx): Parse [Facebook JSX syntax extensions](https://github.com/facebook/jsx)
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-private-methods`](https://github.com/acornjs/acorn-private-methods): parse [private methods, getters and setters proposal](https://github.com/tc39/proposal-private-methods)n

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

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export as namespace acorn
export = acorn
declare namespace acorn {
function parse(input: string, options?: Options): Node
function parseExpressionAt(input: string, pos?: number, options?: Options): Node
function tokenizer(input: string, options?: Options): {
getToken(): Token
[Symbol.iterator](): Iterator<Token>
}
interface Options {
ecmaVersion?: 3 | 5 | 6 | 7 | 8 | 9 | 10 | 2015 | 2016 | 2017 | 2018 | 2019
sourceType?: 'script' | 'module'
onInsertedSemicolon?: (lastTokEnd: number, lastTokEndLoc?: Position) => void
onTrailingComma?: (lastTokEnd: number, lastTokEndLoc?: Position) => void
allowReserved?: boolean
allowReturnOutsideFunction?: boolean
allowImportExportEverywhere?: boolean
allowAwaitOutsideFunction?: boolean
allowHashBang?: boolean
locations?: boolean
onToken?: ((token: Token) => any) | Token[]
onComment?: ((
isBlock: boolean, text: string, start: number, end: number, startLoc?: Position,
endLoc?: Position
) => void) | Comment[]
ranges?: boolean
program?: Node
sourceFile?: string
directSourceFile?: string
preserveParens?: boolean
}
class Parser {
constructor(options: Options, input: string, startPos?: number)
parse(): Node
static parse(input: string, options?: Options): Node
static parseExpressionAt(input: string, pos: number, options?: Options): Node
static tokenizer(input: string, options?: Options): {
getToken(): Token
[Symbol.iterator](): Iterator<Token>
}
static extend(...plugins: ((BaseParser: typeof Parser) => typeof Parser)[]): typeof Parser
}
interface Position { line: number; column: number; offset: number }
const defaultOptions: Options
function getLineInfo(input: string, offset: number): Position
class SourceLocation {
start: Position
end: Position
source?: string | null
constructor(p: Parser, start: Position, end: Position)
}
class Node {
type: string
start: number
end: number
loc?: SourceLocation
sourceFile?: string
range?: [number, number]
constructor(parser: Parser, pos: number, loc?: SourceLocation)
}
class TokenType {
label: string
keyword: string
beforeExpr: boolean
startsExpr: boolean
isLoop: boolean
isAssign: boolean
prefix: boolean
postfix: boolean
binop: number
updateContext?: (prevType: TokenType) => void
constructor(label: string, conf?: any)
}
const tokTypes: {
num: TokenType
regexp: TokenType
string: TokenType
name: TokenType
eof: TokenType
bracketL: TokenType
bracketR: TokenType
braceL: TokenType
braceR: TokenType
parenL: TokenType
parenR: TokenType
comma: TokenType
semi: TokenType
colon: TokenType
dot: TokenType
question: TokenType
arrow: TokenType
template: TokenType
ellipsis: TokenType
backQuote: TokenType
dollarBraceL: TokenType
eq: TokenType
assign: TokenType
incDec: TokenType
prefix: TokenType
logicalOR: TokenType
logicalAND: TokenType
bitwiseOR: TokenType
bitwiseXOR: TokenType
bitwiseAND: TokenType
equality: TokenType
relational: TokenType
bitShift: TokenType
plusMin: TokenType
modulo: TokenType
star: TokenType
slash: TokenType
starstar: TokenType
_break: TokenType
_case: TokenType
_catch: TokenType
_continue: TokenType
_debugger: TokenType
_default: TokenType
_do: TokenType
_else: TokenType
_finally: TokenType
_for: TokenType
_function: TokenType
_if: TokenType
_return: TokenType
_switch: TokenType
_throw: TokenType
_try: TokenType
_var: TokenType
_const: TokenType
_while: TokenType
_with: TokenType
_new: TokenType
_this: TokenType
_super: TokenType
_class: TokenType
_extends: TokenType
_export: TokenType
_import: TokenType
_null: TokenType
_true: TokenType
_false: TokenType
_in: TokenType
_instanceof: TokenType
_typeof: TokenType
_void: TokenType
_delete: TokenType
}
class TokContext {
constructor(token: string, isExpr: boolean, preserveSpace: boolean, override?: (p: Parser) => void)
}
const tokContexts: {
b_stat: TokContext
b_expr: TokContext
b_tmpl: TokContext
p_stat: TokContext
p_expr: TokContext
q_tmpl: TokContext
f_expr: TokContext
}
function isIdentifierStart(code: number, astral?: boolean): boolean
function isIdentifierChar(code: number, astral?: boolean): boolean
interface AbstractToken {
}
interface Comment extends AbstractToken {
type: string
value: string
start: number
end: number
loc?: SourceLocation
range?: [number, number]
}
class Token {
type: TokenType
value: any
start: number
end: number
loc?: SourceLocation
range?: [number, number]
constructor(p: Parser)
}
function isNewLine(code: number): boolean
const lineBreak: RegExp
const lineBreakG: RegExp
const version: string
}

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#!/usr/bin/env node
'use strict'; 'use strict';
var path = require('path'); var path = require('path');
var fs = require('fs'); var fs = require('fs');
var acorn = require('../dist/acorn.js'); var acorn = require('./acorn.js');
var infile; var infile;
var forceFile; var forceFile;

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{
"name": "acorn",
"description": "ECMAScript parser",
"homepage": "https://github.com/acornjs/acorn",
"main": "dist/acorn.js",
"module": "dist/acorn.mjs",
"version": "6.0.7",
"engines": {"node": ">=0.4.0"},
"maintainers": [
{
"name": "Marijn Haverbeke",
"email": "marijnh@gmail.com",
"web": "https://marijnhaverbeke.nl"
},
{
"name": "Ingvar Stepanyan",
"email": "me@rreverser.com",
"web": "https://rreverser.com/"
},
{
"name": "Adrian Heine",
"web": "http://adrianheine.de"
}
],
"repository": {
"type": "git",
"url": "https://github.com/acornjs/acorn.git"
},
"license": "MIT",
"scripts": {
"prepare": "cd ..; npm run build:main && npm run build:bin"
},
"bin": {"acorn": "./bin/acorn"}
}

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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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annexB/language/function-code/block-decl-func-no-skip-try.js (default)
annexB/language/function-code/block-decl-func-skip-early-err-block.js (default)
annexB/language/function-code/block-decl-func-skip-early-err.js (default)
annexB/language/function-code/block-decl-func-skip-early-err-switch.js (default)
annexB/language/function-code/block-decl-func-skip-early-err-try.js (default)
annexB/language/function-code/if-decl-else-decl-a-func-no-skip-try.js (default)
annexB/language/function-code/if-decl-else-decl-a-func-skip-early-err-block.js (default)
annexB/language/function-code/if-decl-else-decl-a-func-skip-early-err.js (default)
annexB/language/function-code/if-decl-else-decl-a-func-skip-early-err-switch.js (default)
annexB/language/function-code/if-decl-else-decl-a-func-skip-early-err-try.js (default)
annexB/language/function-code/if-decl-else-decl-b-func-no-skip-try.js (default)
annexB/language/function-code/if-decl-else-decl-b-func-skip-early-err-block.js (default)
annexB/language/function-code/if-decl-else-decl-b-func-skip-early-err.js (default)
annexB/language/function-code/if-decl-else-decl-b-func-skip-early-err-switch.js (default)
annexB/language/function-code/if-decl-else-decl-b-func-skip-early-err-try.js (default)
annexB/language/function-code/if-decl-else-stmt-func-no-skip-try.js (default)
annexB/language/function-code/if-decl-else-stmt-func-skip-early-err-block.js (default)
annexB/language/function-code/if-decl-else-stmt-func-skip-early-err.js (default)
annexB/language/function-code/if-decl-else-stmt-func-skip-early-err-switch.js (default)
annexB/language/function-code/if-decl-else-stmt-func-skip-early-err-try.js (default)
annexB/language/function-code/if-decl-no-else-func-no-skip-try.js (default)
annexB/language/function-code/if-decl-no-else-func-skip-early-err-block.js (default)
annexB/language/function-code/if-decl-no-else-func-skip-early-err.js (default)
annexB/language/function-code/if-decl-no-else-func-skip-early-err-switch.js (default)
annexB/language/function-code/if-decl-no-else-func-skip-early-err-try.js (default)
annexB/language/function-code/if-stmt-else-decl-func-no-skip-try.js (default)
annexB/language/function-code/if-stmt-else-decl-func-skip-early-err-block.js (default)
annexB/language/function-code/if-stmt-else-decl-func-skip-early-err.js (default)
annexB/language/function-code/if-stmt-else-decl-func-skip-early-err-switch.js (default)
annexB/language/function-code/if-stmt-else-decl-func-skip-early-err-try.js (default)
annexB/language/function-code/switch-case-func-no-skip-try.js (default)
annexB/language/function-code/switch-case-func-skip-early-err-block.js (default)
annexB/language/function-code/switch-case-func-skip-early-err.js (default)
annexB/language/function-code/switch-case-func-skip-early-err-switch.js (default)
annexB/language/function-code/switch-case-func-skip-early-err-try.js (default)
annexB/language/function-code/switch-dflt-func-no-skip-try.js (default)
annexB/language/function-code/switch-dflt-func-skip-early-err-block.js (default)
annexB/language/function-code/switch-dflt-func-skip-early-err.js (default)
annexB/language/function-code/switch-dflt-func-skip-early-err-switch.js (default)
annexB/language/function-code/switch-dflt-func-skip-early-err-try.js (default)
annexB/language/global-code/block-decl-global-no-skip-try.js (default)
annexB/language/global-code/block-decl-global-skip-early-err-block.js (default)
annexB/language/global-code/block-decl-global-skip-early-err.js (default)
annexB/language/global-code/block-decl-global-skip-early-err-switch.js (default)
annexB/language/global-code/block-decl-global-skip-early-err-try.js (default)
annexB/language/global-code/if-decl-else-decl-a-global-no-skip-try.js (default)
annexB/language/global-code/if-decl-else-decl-a-global-skip-early-err-block.js (default)
annexB/language/global-code/if-decl-else-decl-a-global-skip-early-err.js (default)
annexB/language/global-code/if-decl-else-decl-a-global-skip-early-err-switch.js (default)
annexB/language/global-code/if-decl-else-decl-a-global-skip-early-err-try.js (default)
annexB/language/global-code/if-decl-else-decl-b-global-no-skip-try.js (default)
annexB/language/global-code/if-decl-else-decl-b-global-skip-early-err-block.js (default)
annexB/language/global-code/if-decl-else-decl-b-global-skip-early-err.js (default)
annexB/language/global-code/if-decl-else-decl-b-global-skip-early-err-switch.js (default)
annexB/language/global-code/if-decl-else-decl-b-global-skip-early-err-try.js (default)
annexB/language/global-code/if-decl-else-stmt-global-no-skip-try.js (default)
annexB/language/global-code/if-decl-else-stmt-global-skip-early-err-block.js (default)
annexB/language/global-code/if-decl-else-stmt-global-skip-early-err.js (default)
annexB/language/global-code/if-decl-else-stmt-global-skip-early-err-switch.js (default)
annexB/language/global-code/if-decl-else-stmt-global-skip-early-err-try.js (default)
annexB/language/global-code/if-decl-no-else-global-no-skip-try.js (default)
annexB/language/global-code/if-decl-no-else-global-skip-early-err-block.js (default)
annexB/language/global-code/if-decl-no-else-global-skip-early-err.js (default)
annexB/language/global-code/if-decl-no-else-global-skip-early-err-switch.js (default)
annexB/language/global-code/if-decl-no-else-global-skip-early-err-try.js (default)
annexB/language/global-code/if-stmt-else-decl-global-no-skip-try.js (default)
annexB/language/global-code/if-stmt-else-decl-global-skip-early-err-block.js (default)
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annexB/language/global-code/if-stmt-else-decl-global-skip-early-err-switch.js (default)
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0
deps/acorn/dist/.keep vendored
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1424
deps/acorn/dist/acorn_loose.es.js vendored
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1434
deps/acorn/dist/acorn_loose.js vendored
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60
deps/acorn/package.json vendored
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@ -1,60 +0,0 @@
{
"name": "acorn",
"description": "ECMAScript parser",
"homepage": "https://github.com/acornjs/acorn",
"main": "dist/acorn.js",
"module": "dist/acorn.es.js",
"version": "5.7.2",
"engines": {
"node": ">=0.4.0"
},
"maintainers": [
{
"name": "Marijn Haverbeke",
"email": "marijnh@gmail.com",
"web": "http://marijnhaverbeke.nl"
},
{
"name": "Ingvar Stepanyan",
"email": "me@rreverser.com",
"web": "http://rreverser.com/"
},
{
"name": "Adrian Heine",
"email": "http://adrianheine.de"
}
],
"repository": {
"type": "git",
"url": "https://github.com/acornjs/acorn.git"
},
"license": "MIT",
"scripts": {
"prepare": "npm run build && node test/run.js && node test/lint.js",
"test": "node test/run.js && node test/lint.js",
"pretest": "npm run build:main && npm run build:loose",
"test:test262": "node bin/run_test262.js",
"build": "npm run build:main && npm run build:walk && npm run build:loose && npm run build:bin",
"build:main": "rollup -c rollup/config.main.js",
"build:walk": "rollup -c rollup/config.walk.js",
"build:loose": "rollup -c rollup/config.loose.js && rollup -c rollup/config.loose_es.js",
"build:bin": "rollup -c rollup/config.bin.js",
"lint": "eslint src/"
},
"bin": {
"acorn": "./bin/acorn"
},
"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"
}
}

4
lib/assert.js
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@ -200,8 +200,8 @@ function getCode(fd, line, column) {
function parseCode(code, offset) { function parseCode(code, offset) {
// Lazy load acorn. // Lazy load acorn.
if (parseExpressionAt === undefined) { if (parseExpressionAt === undefined) {
({ parseExpressionAt } = require('internal/deps/acorn/dist/acorn')); ({ parseExpressionAt } = require('internal/deps/acorn/acorn/dist/acorn'));
({ findNodeAround } = require('internal/deps/acorn/dist/walk')); ({ findNodeAround } = require('internal/deps/acorn/acorn-walk/dist/walk'));
} }
let node; let node;
let start = 0; let start = 0;

4
lib/internal/repl/await.js
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@ -1,7 +1,7 @@
'use strict'; 'use strict';
const acorn = require('internal/deps/acorn/dist/acorn'); const acorn = require('internal/deps/acorn/acorn/dist/acorn');
const walk = require('internal/deps/acorn/dist/walk'); const walk = require('internal/deps/acorn/acorn-walk/dist/walk');
const noop = () => {}; const noop = () => {};
const visitorsWithoutAncestors = { const visitorsWithoutAncestors = {

31
lib/internal/repl/recoverable.js
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@ -1,7 +1,7 @@
'use strict'; 'use strict';
const acorn = require('internal/deps/acorn/dist/acorn'); const acorn = require('internal/deps/acorn/acorn/dist/acorn');
const { tokTypes: tt } = acorn; const { tokTypes: tt, Parser: AcornParser } = acorn;
// If the error is that we've unexpectedly ended the input, // If the error is that we've unexpectedly ended the input,
// then let the user try to recover by adding more input. // then let the user try to recover by adding more input.
@ -26,17 +26,13 @@ function isRecoverableError(e, code) {
// change these messages in the future, this will lead to a test // change these messages in the future, this will lead to a test
// failure, indicating that this code needs to be updated. // failure, indicating that this code needs to be updated.
// //
acorn.plugins.replRecoverable = (parser) => { const RecoverableParser = AcornParser.extend((Parser) => {
parser.extend('nextToken', (nextToken) => { return class extends Parser {
return function() { nextToken() {
Reflect.apply(nextToken, this, []); super.nextToken();
if (this.type === tt.eof) recoverable = true; if (this.type === tt.eof) recoverable = true;
}; }
}); raise(pos, message) {
parser.extend('raise', (raise) => {
return function(pos, message) {
switch (message) { switch (message) {
case 'Unterminated template': case 'Unterminated template':
case 'Unterminated comment': case 'Unterminated comment':
@ -48,11 +44,10 @@ function isRecoverableError(e, code) {
// See https://www.ecma-international.org/ecma-262/#sec-line-terminators // See https://www.ecma-international.org/ecma-262/#sec-line-terminators
recoverable = /\\(?:\r\n?|\n|\u2028|\u2029)$/.test(token); recoverable = /\\(?:\r\n?|\n|\u2028|\u2029)$/.test(token);
} }
super.raise(pos, message);
Reflect.apply(raise, this, [pos, message]); }
}; };
}); });
};
// For similar reasons as `defaultEval`, wrap expressions starting with a // For similar reasons as `defaultEval`, wrap expressions starting with a
// curly brace with parenthesis. Note: only the open parenthesis is added // curly brace with parenthesis. Note: only the open parenthesis is added
@ -63,7 +58,7 @@ function isRecoverableError(e, code) {
// Try to parse the code with acorn. If the parse fails, ignore the acorn // Try to parse the code with acorn. If the parse fails, ignore the acorn
// error and return the recoverable status. // error and return the recoverable status.
try { try {
acorn.parse(code, { plugins: { replRecoverable: true }, ecmaVersion: 10 }); RecoverableParser.parse(code, { ecmaVersion: 10 });
// Odd case: the underlying JS engine (V8, Chakra) rejected this input // Odd case: the underlying JS engine (V8, Chakra) rejected this input
// but Acorn detected no issue. Presume that additional text won't // but Acorn detected no issue. Presume that additional text won't

2
lib/repl.js
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@ -50,7 +50,7 @@ const {
const { const {
isIdentifierStart, isIdentifierStart,
isIdentifierChar isIdentifierChar
} = require('internal/deps/acorn/dist/acorn'); } = require('internal/deps/acorn/acorn/dist/acorn');
const internalUtil = require('internal/util'); const internalUtil = require('internal/util');
const util = require('util'); const util = require('util');
const Stream = require('stream'); const Stream = require('stream');

4
node.gyp
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@ -219,8 +219,8 @@
'deps/node-inspect/lib/_inspect.js', 'deps/node-inspect/lib/_inspect.js',
'deps/node-inspect/lib/internal/inspect_client.js', 'deps/node-inspect/lib/internal/inspect_client.js',
'deps/node-inspect/lib/internal/inspect_repl.js', 'deps/node-inspect/lib/internal/inspect_repl.js',
'deps/acorn/dist/acorn.js', 'deps/acorn/acorn/dist/acorn.js',
'deps/acorn/dist/walk.js', 'deps/acorn/acorn-walk/dist/walk.js',
], ],
'conditions': [ 'conditions': [
[ 'node_shared=="true"', { [ 'node_shared=="true"', {

2
tools/doc/apilinks.js
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@ -18,7 +18,7 @@
// `function X(...) {...}`). Over time, we expect to handle more // `function X(...) {...}`). Over time, we expect to handle more
// cases (example: ES2015 class definitions). // cases (example: ES2015 class definitions).
const acorn = require('../../deps/acorn'); const acorn = require('../../deps/acorn/acorn');
const fs = require('fs'); const fs = require('fs');
const path = require('path'); const path = require('path');
const child_process = require('child_process'); const child_process = require('child_process');

2
tools/license-builder.sh
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@ -29,7 +29,7 @@ fi
# Dependencies bundled in distributions # Dependencies bundled in distributions
addlicense "Acorn" "deps/acorn" "$(cat ${rootdir}/deps/acorn/LICENSE)" addlicense "Acorn" "deps/acorn" "$(cat ${rootdir}/deps/acorn/acorn/LICENSE)"
addlicense "c-ares" "deps/cares" "$(tail -n +3 ${rootdir}/deps/cares/LICENSE.md)" addlicense "c-ares" "deps/cares" "$(tail -n +3 ${rootdir}/deps/cares/LICENSE.md)"
addlicense "HTTP Parser" "deps/http_parser" "$(cat deps/http_parser/LICENSE-MIT)" addlicense "HTTP Parser" "deps/http_parser" "$(cat deps/http_parser/LICENSE-MIT)"
if [ -f "${rootdir}/deps/icu/LICENSE" ]; then if [ -f "${rootdir}/deps/icu/LICENSE" ]; then