67 lines
1.5 KiB
JavaScript
67 lines
1.5 KiB
JavaScript
(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(factory((global.estreeWalker = global.estreeWalker || {})));
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}(this, function (exports) { 'use strict';
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function walk ( ast, ref) {
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var enter = ref.enter;
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var leave = ref.leave;
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visit( ast, null, enter, leave );
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}
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var context = {
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skip: function () { return context.shouldSkip = true; },
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shouldSkip: false
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};
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var childKeys = {};
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var toString = Object.prototype.toString;
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function isArray ( thing ) {
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return toString.call( thing ) === '[object Array]';
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}
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function visit ( node, parent, enter, leave, prop, index ) {
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if ( !node ) return;
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if ( enter ) {
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context.shouldSkip = false;
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enter.call( context, node, parent, prop, index );
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if ( context.shouldSkip ) return;
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}
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var keys = childKeys[ node.type ] || (
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childKeys[ node.type ] = Object.keys( node ).filter( function ( key ) { return typeof node[ key ] === 'object'; } )
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);
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var key, value, i, j;
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i = keys.length;
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while ( i-- ) {
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key = keys[i];
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value = node[ key ];
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if ( isArray( value ) ) {
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j = value.length;
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while ( j-- ) {
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visit( value[j], node, enter, leave, key, j );
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}
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}
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else if ( value && value.type ) {
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visit( value, node, enter, leave, key, null );
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}
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}
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if ( leave ) {
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leave( node, parent, prop, index );
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}
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}
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exports.walk = walk;
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}));
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//# sourceMappingURL=estree-walker.umd.js.map
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