README.md #1
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:
The following selectors are supported:
- AST node type:
ForStatement - wildcard:
* - attribute existence:
[attr] - attribute value:
[attr="foo"]or[attr=123] - attribute regex:
[attr=/foo.*/] - attribute conditons:
[attr!="foo"],[attr>2],[attr<3],[attr>=2], or[attr<=3] - nested attribute:
[attr.level2="foo"] - field:
FunctionDeclaration > Identifier.id - First or last child:
:first-childor:last-child - nth-child (no ax+b support):
:nth-child(2) - nth-last-child (no ax+b support):
:nth-last-child(1) - descendant:
ancestor descendant - child:
parent > child - following sibling:
node ~ sibling - adjacent sibling:
node + adjacent - negation:
:not(ForStatement) - matches-any:
:matches([attr] > :first-child, :last-child) - subject indicator:
!IfStatement > [name="foo"] - class of AST node:
:statement,:expression,:declaration,:function, or:pattern
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.*/]` * attribute conditons: `[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)` * [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` [](https://travis-ci.org/estools/esquery)