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54 lines
1.0 KiB
JavaScript
54 lines
1.0 KiB
JavaScript
6 years ago
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'use strict';
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/**
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* Merge `b` into `a`.
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*
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* @param {Object} a
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* @param {Object} b
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* @return {Object}
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* @api public
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*/
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exports.merge = function(a, b) {
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for (var key in b) a[key] = b[key];
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return a;
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};
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exports.stringify = function(str) {
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return JSON.stringify(str)
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.replace(/\u2028/g, '\\u2028')
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.replace(/\u2029/g, '\\u2029');
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};
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exports.walkAST = function walkAST(ast, before, after) {
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before && before(ast);
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switch (ast.type) {
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case 'Block':
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ast.nodes.forEach(function (node) {
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walkAST(node, before, after);
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});
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break;
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case 'Case':
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case 'Each':
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case 'Mixin':
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case 'Tag':
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case 'When':
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case 'Code':
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ast.block && walkAST(ast.block, before, after);
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break;
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case 'Attrs':
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case 'BlockComment':
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case 'Comment':
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case 'Doctype':
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case 'Filter':
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case 'Literal':
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case 'MixinBlock':
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case 'Text':
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break;
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default:
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throw new Error('Unexpected node type ' + ast.type);
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break;
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}
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after && after(ast);
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};
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