1  'use strict';
 2  
 3  const utils = require('./utils');
 4  
 5  module.exports = (ast, options = {}) => {
 6    let stringify = (node, parent = {}) => {
 7      let invalidBlock = options.escapeInvalid && utils.isInvalidBrace(parent);
 8      let invalidNode = node.invalid === true && options.escapeInvalid === true;
 9      let output = '';
10  
11      if (node.value) {
12        if ((invalidBlock || invalidNode) && utils.isOpenOrClose(node)) {
13          return '\\' + node.value;
14        }
15        return node.value;
16      }
17  
18      if (node.value) {
19        return node.value;
20      }
21  
22      if (node.nodes) {
23        for (let child of node.nodes) {
24          output += stringify(child);
25        }
26      }
27      return output;
28    };
29  
30    return stringify(ast);
31  };
32