Method astForStatement

src/backend/web-gl/function-node.js:631–700

* @desc Parses the abstract syntax tree for *for-loop* expression * @param {Object} forNode - An ast Node * @param {Array} retArr - return array string * @returns {Array} the parsed webgl string

(forNode, retArr)

   * @returns {Array} the parsed webgl string
   */
  astForStatement(forNode, retArr) {
    if (forNode.type !== 'ForStatement') {
      throw this.astErrorOutput('Invalid for statement', forNode);
    }

    const initArr = [];
    const testArr = [];
    const updateArr = [];
    const bodyArr = [];
    let isSafe = null;

    if (forNode.init) {
      const { declarations } = forNode.init;
      if (declarations.length > 1) {
        isSafe = false;
      }
      this.astGeneric(forNode.init, initArr);
      for (let i = 0; i < declarations.length; i++) {
        if (declarations[i].init && declarations[i].init.type !== 'Literal') {
          isSafe = false;
        }
      }
    } else {
      isSafe = false;
    }

    if (forNode.test) {
      this.astGeneric(forNode.test, testArr);
    } else {
      isSafe = false;
    }

    if (forNode.update) {
      this.astGeneric(forNode.update, updateArr);
    } else {
      isSafe = false;
    }

    if (forNode.body) {
      this.pushState('loop-body');
      this.astGeneric(forNode.body, bodyArr);
      this.popState('loop-body');
    }

    // have all parts, now make them safe
    if (isSafe === null) {
      isSafe = this.isSafe(forNode.init) && this.isSafe(forNode.test);
    }

    if (isSafe) {
      const initString = initArr.join('');
      const initNeedsSemiColon = initString[initString.length - 1] !== ';';
      retArr.push(`for (${initString}${initNeedsSemiColon ? ';' : ''}${testArr.join('')};${updateArr.join('')}){\n`);
      retArr.push(bodyArr.join(''));
      retArr.push('}\n');
    } else {
      const iVariableName = this.getInternalVariableName('safeI');
      if (initArr.length > 0) {