esquery
A query library for ECMAScript AST using a CSS selector like query language.
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
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michaelficarra published 2015-05-05T04:17:31.458Z
- 0.4.0 is the latest of 5 releases
- github.com/jrfeenst/esquery
Collaborators
Stats
- 173 downloads in the last day
- 8141 downloads in the last week
- 27692 downloads in the last month
- Have an issue? File it.
Try it out
Keywords
query, javascript, ecmascript, ast
Dependencies (1)
Dependents
tractor, tractor-server, w3c-sm, @mfjs/compiler, jsm2c, idlx, minty, angular-templatecache-extract, wavi, data-member-defender, testgen, eselement, lintspelljs, nmv, esplan, yui-configger, unused-es6, relex, esdispatch, ast-eval, closure-deps-resolver, due-compiler, detect-invalid-requires, fix-module-naming, flowmatic, extract-required, arabika