pax_global_header00006660000000000000000000000064132053167520014516gustar00rootroot0000000000000052 comment=56e487e0b8fe966f8f65d11f887d6803fa995a14 estree-walker-0.5.1/000077500000000000000000000000001320531675200142735ustar00rootroot00000000000000estree-walker-0.5.1/.eslintrc000066400000000000000000000012541320531675200161210ustar00rootroot00000000000000{ "rules": { "indent": [ 2, "tab", { "SwitchCase": 1 } ], "quotes": [ 2, "single" ], "linebreak-style": [ 2, "unix" ], "semi": [ 2, "always" ], "keyword-spacing": [ 2, { "before": true, "after": true } ], "space-before-blocks": [ 2, "always" ], "space-before-function-paren": [ 2, "always" ], "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ], "no-cond-assign": [ 0 ] }, "env": { "es6": true, "browser": true, "mocha": true, "node": true }, "extends": "eslint:recommended", "parserOptions": { "ecmaVersion": 6, "sourceType": "module" } } estree-walker-0.5.1/.gitignore000066400000000000000000000000221320531675200162550ustar00rootroot00000000000000node_modules dist estree-walker-0.5.1/CHANGELOG.md000066400000000000000000000011071320531675200161030ustar00rootroot00000000000000# changelog ## 0.5.1 * Prevent context corruption when `walk()` is called during a walk ## 0.5.0 * Export `childKeys`, for manually fixing in case of malformed ASTs ## 0.4.0 * Add TypeScript typings ([#3](https://github.com/Rich-Harris/estree-walker/pull/3)) ## 0.3.1 * Include `pkg.repository` ([#2](https://github.com/Rich-Harris/estree-walker/pull/2)) ## 0.3.0 * More predictable ordering ## 0.2.1 * Keep `context` shape ## 0.2.0 * Add ES6 build ## 0.1.3 * npm snafu ## 0.1.2 * Pass current prop and index to `enter`/`leave` callbacks ## 0.1.1 * First release estree-walker-0.5.1/README.md000066400000000000000000000026061320531675200155560ustar00rootroot00000000000000# estree-walker Simple utility for walking an [ESTree](https://github.com/estree/estree)-compliant AST, such as one generated by [acorn](https://github.com/marijnh/acorn). ## Installation ```bash npm i estree-walker ``` ## Usage ```js var walk = require( 'estree-walker' ).walk; var acorn = require( 'acorn' ); ast = acorn.parse( sourceCode, options ); // https://github.com/marijnh/acorn walk( ast, { enter: function ( node, parent ) { // some code happens }, leave: function ( node, parent ) { // some code happens } }); ``` Inside the `enter` function, calling `this.skip()` will prevent the node's children being walked, or the `leave` function (which is optional) being called. ## Why not use estraverse? The ESTree spec is evolving to accommodate ES6/7. I've had a couple of experiences where [estraverse](https://github.com/estools/estraverse) was unable to handle an AST generated by recent versions of acorn, because it hard-codes visitor keys. estree-walker, by contrast, simply enumerates a node's properties to find child nodes (and child lists of nodes), and is therefore resistant to spec changes. It's also much smaller. (The performance, if you're wondering, is basically identical.) None of which should be taken as criticism of estraverse, which has more features and has been battle-tested in many more situations, and for which I'm very grateful. ## License MITestree-walker-0.5.1/index.d.ts000066400000000000000000000006321320531675200161750ustar00rootroot00000000000000declare module "estree-walker" { export interface Node { start: number; end: number; type: string; [propName: string]: any; } export type WalkerListener = (node: Node, parent?: Node, prop?: string, index?: number) => void; export interface WalkerOptions { enter?: WalkerListener; leave?: WalkerListener; } export function walk(ast: Node, options: WalkerOptions): void; } estree-walker-0.5.1/package-lock.json000066400000000000000000001364771320531675200175310ustar00rootroot00000000000000{ "name": "estree-walker", "version": "0.5.0", "lockfileVersion": 1, "requires": true, "dependencies": { "acorn": { "version": "3.3.0", "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz", "integrity": 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"MIT", "typings": "index.d.ts", "repository": { "type": "git", "url": "https://github.com/Rich-Harris/estree-walker" }, "main": "dist/estree-walker.umd.js", "module": "dist/estree-walker.es.js", "jsnext:main": "dist/estree-walker.es.js", "scripts": { "prepublish": "npm run lint && npm test", "build": "rollup -c", "test": "mocha test/test.js --compilers js:buble/register", "pretest": "npm run build", "lint": "eslint src" }, "devDependencies": { "buble": "^0.15.2", "eslint": "^4.5.0", "mocha": "^3.5.0", "rollup": "^0.48.0", "rollup-plugin-buble": "^0.15.0" }, "files": [ "src", "dist", "README.md" ] } estree-walker-0.5.1/rollup.config.js000066400000000000000000000004271320531675200174150ustar00rootroot00000000000000import buble from 'rollup-plugin-buble'; import pkg from './package.json'; export default { input: 'src/estree-walker.js', output: [ { file: pkg.main, format: 'umd', name: 'estreeWalker' }, { file: pkg.module, format: 'es' } ], plugins: [ buble() ], sourcemap: true }; estree-walker-0.5.1/src/000077500000000000000000000000001320531675200150625ustar00rootroot00000000000000estree-walker-0.5.1/src/estree-walker.js000066400000000000000000000021751320531675200201770ustar00rootroot00000000000000export function walk ( ast, { enter, leave }) { visit( ast, null, enter, leave ); } let shouldSkip = false; const context = { skip: () => shouldSkip = true }; export const childKeys = {}; const toString = Object.prototype.toString; function isArray ( thing ) { return toString.call( thing ) === '[object Array]'; } function visit ( node, parent, enter, leave, prop, index ) { if ( !node ) return; if ( enter ) { let _shouldSkip = shouldSkip; shouldSkip = false; enter.call( context, node, parent, prop, index ); const skipped = shouldSkip; shouldSkip = _shouldSkip; if ( skipped ) return; } const keys = childKeys[ node.type ] || ( childKeys[ node.type ] = Object.keys( node ).filter( key => typeof node[ key ] === 'object' ) ); for ( let i = 0; i < keys.length; i += 1 ) { const key = keys[i]; const value = node[ key ]; if ( isArray( value ) ) { for ( let j = 0; j < value.length; j += 1 ) { visit( value[j], node, enter, leave, key, j ); } } else if ( value && value.type ) { visit( value, node, enter, leave, key, null ); } } if ( leave ) { leave( node, parent, prop, index ); } } estree-walker-0.5.1/test/000077500000000000000000000000001320531675200152525ustar00rootroot00000000000000estree-walker-0.5.1/test/test.js000066400000000000000000000064121320531675200165720ustar00rootroot00000000000000const { describe, it } = require( 'mocha' ); const assert = require( 'assert' ); const { walk, childKeys } = require( '..' ); describe( 'estree-walker', () => { it( 'walks a malformed node, if childKeys is populated', () => { // this test must come first, otherwise it doesn't have // an opportunity to present childKeys.Foo = [ 'answer' ]; const block = [ { type: 'Foo', answer: undefined }, { type: 'Foo', answer: { type: 'Answer', value: 42 } } ]; let answer; walk({ type: 'Test', block }, { enter ( node ) { if ( node.type === 'Answer' ) answer = node; } }); assert.equal(answer, block[1].answer); }); it( 'walks an AST', () => { const ast = { type: 'Program', body: [{ type: 'VariableDeclaration', declarations: [ { type: 'VariableDeclarator', id: { type: 'Identifier', name: 'a' }, init: { type: 'Literal', value: 1, raw: '1' } }, { type: 'VariableDeclarator', id: { type: 'Identifier', name: 'b' }, init: { type: 'Literal', value: 2, raw: '2' } } ], kind: 'var' }], sourceType: 'module' }; let entered = []; let left = []; walk( ast, { enter ( node ) { entered.push( node ); }, leave ( node ) { left.push( node ); } }); assert.deepEqual( entered, [ ast, ast.body[0], ast.body[0].declarations[0], ast.body[0].declarations[0].id, ast.body[0].declarations[0].init, ast.body[0].declarations[1], ast.body[0].declarations[1].id, ast.body[0].declarations[1].init ]); assert.deepEqual( left, [ ast.body[0].declarations[0].id, ast.body[0].declarations[0].init, ast.body[0].declarations[0], ast.body[0].declarations[1].id, ast.body[0].declarations[1].init, ast.body[0].declarations[1], ast.body[0], ast ]); }); it( 'handles null literals', () => { const ast = { type: 'Program', start: 0, end: 8, body: [ { type: 'ExpressionStatement', start: 0, end: 5, expression: { type: 'Literal', start: 0, end: 4, value: null, raw: 'null' } }, { type: 'ExpressionStatement', start: 6, end: 8, expression: { type: 'Literal', start: 6, end: 7, value: 1, raw: '1' } } ], sourceType: 'module' }; walk( ast, { enter () {}, leave () {} }); assert.ok( true ); }); it( 'allows walk() to be invoked within a walk, without context corruption', () => { const ast = { type: 'Program', start: 0, end: 8, body: [{ type: 'ExpressionStatement', start: 0, end: 6, expression: { type: 'BinaryExpression', start: 0, end: 5, left: { type: 'Identifier', start: 0, end: 1, name: 'a' }, operator: '+', right: { type: 'Identifier', start: 4, end: 5, name: 'b' } } }], sourceType: 'module' }; const identifiers = []; walk( ast, { enter (node) { if (node.type === 'ExpressionStatement') { walk(node, { enter () { this.skip(); } }); } if (node.type === 'Identifier') { identifiers.push(node.name); } } }); assert.deepEqual(identifiers, ['a', 'b']); }); });