smarty-to-mustache.js

#!/usr/bin/env node

const fs = require('fs');
const jSmart = require('../../jsmart');

const tpl = fs.readFileSync('./test-file.tpl', {encoding: 'utf-8'});
  debugger;
  const compiledTemplate = new jSmart(tpl, {autoLiteral: false, ldelim: "{%", rdelim: "%}"});
//   const output = compiledTemplate.fetch({my_variable: 'Hello World', my_conditional: true});
//   // output will be "Hello world"
const tree = compiledTemplate.tree;

function transpile(tree){
  let transpiled = "";
  for(let i = 0; i < tree.length; i++) {
    const node = tree[i];
    switch(node.type) {
      case 'text':
        transpiled += node.data
        continue;
      case 'build-in':
        if(node.name === 'expression') {
          const { expression } = node;
          if(expression && expression.type == 'var') {
            const { parts } = expression;
            parts.map(({type, data}) => {
              transpiled += `{{${data}}}`
            });
          }
        } else if (node.name === 'if') {
            const ifBlock = transpile(node.subTreeIf);
            const elseBlock = transpile(node.subTreeElse);
            const conditional = node.params.toString().slice(1);
            transpiled += `{{#${conditional}}}${ifBlock}{{/${conditional}}}`
            transpiled += `{{^${conditional}}}${elseBlock}{{/${conditional}}}`
        } else {
          debugger
        }
        continue
      default:
        transpiled += node.data
          continue;
    }
  }

  return transpiled
}
// console.log(output);

console.log("Original:\n", tpl)
console.log("Mustache\n", transpile(tree));