https://github.com/estools/esquery

ECMAScript AST query library.
https://github.com/estools/esquery

ast ecmascript estree javascript

Last synced: 3 days ago
JSON representation

ECMAScript AST query library.

• Host: GitHub
• URL: https://github.com/estools/esquery
• Owner: estools
• License: other
• Created: 2013-07-15T02:19:39.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2024-08-06T18:07:23.000Z (4 months ago)
• Last Synced: 2024-12-10T04:55:46.556Z (3 days ago)
• Topics: ast, ecmascript, estree, javascript
• Language: JavaScript
• Homepage: http://estools.github.io/esquery/
• Size: 441 KB
• Stars: 834
• Watchers: 15
• Forks: 91
• Open Issues: 41
• Metadata Files:
  • Readme: README.md
  • License: license.txt

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README

        
ESQuery is a library for querying the AST output by Esprima for patterns of syntax using a CSS style selector system. Check out the demo:

[demo](https://estools.github.io/esquery/)

The following selectors are supported:

* AST node type: `ForStatement`

* [wildcard](http://dev.w3.org/csswg/selectors4/#universal-selector): `*`

* [attribute existence](http://dev.w3.org/csswg/selectors4/#attribute-selectors): `[attr]`

* [attribute value](http://dev.w3.org/csswg/selectors4/#attribute-selectors): `[attr="foo"]` or `[attr=123]`

* attribute regex: `[attr=/foo.*/]` or (with flags) `[attr=/foo.*/is]`

* attribute conditions: `[attr!="foo"]`, `[attr>2]`, `[attr<3]`, `[attr>=2]`, or `[attr<=3]`

* nested attribute: `[attr.level2="foo"]`

* field: `FunctionDeclaration > Identifier.id`

* [First](http://dev.w3.org/csswg/selectors4/#the-first-child-pseudo) or [last](http://dev.w3.org/csswg/selectors4/#the-last-child-pseudo) child: `:first-child` or `:last-child`

* [nth-child](http://dev.w3.org/csswg/selectors4/#the-nth-child-pseudo) (no ax+b support): `:nth-child(2)`

* [nth-last-child](http://dev.w3.org/csswg/selectors4/#the-nth-last-child-pseudo) (no ax+b support): `:nth-last-child(1)`

* [descendant](http://dev.w3.org/csswg/selectors4/#descendant-combinators): `ancestor descendant`

* [child](http://dev.w3.org/csswg/selectors4/#child-combinators): `parent > child`

* [following sibling](http://dev.w3.org/csswg/selectors4/#general-sibling-combinators): `node ~ sibling`

* [adjacent sibling](http://dev.w3.org/csswg/selectors4/#adjacent-sibling-combinators): `node + adjacent`

* [negation](http://dev.w3.org/csswg/selectors4/#negation-pseudo): `:not(ForStatement)`

* [has](https://drafts.csswg.org/selectors-4/#has-pseudo): `:has(ForStatement)`, `:has(> ForStatement)`

* [matches-any](http://dev.w3.org/csswg/selectors4/#matches): `:matches([attr] > :first-child, :last-child)`

* [subject indicator](http://dev.w3.org/csswg/selectors4/#subject): `!IfStatement > [name="foo"]`

* class of AST node: `:statement`, `:expression`, `:declaration`, `:function`, or `:pattern`

[![Build Status](https://travis-ci.org/estools/esquery.png?branch=master)](https://travis-ci.org/estools/esquery)