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54 lines
1.0 KiB
JavaScript

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