Method getJsAST

src/backend/function-node.js:186–212

* @desc Parses the class function JS, and returns its Abstract Syntax Tree object. * This is used internally to convert to shader code * * @param {Object} [inParser] - Parser to use, assumes in scope 'parser' if null or undefined * * @returns {Object} The function AST Object, note tha

(inParser)

   * @returns {Object} The function AST Object, note that result is cached under this.ast;
   */
  getJsAST(inParser) {
    if (this.ast) {
      return this.ast;
    }
    if (typeof this.source === 'object') {
      this.traceFunctionAST(this.source);
      return this.ast = this.source;
    }

    inParser = inParser || acorn;
    if (inParser === null) {
      throw new Error('Missing JS to AST parser');
    }

    const ast = Object.freeze(inParser.parse(`const parser_${ this.name } = ${ this.source };`, {
      locations: true
    }));
    // take out the function object, outside the var declarations
    const functionAST = ast.body[0].declarations[0].init;
    this.traceFunctionAST(functionAST);

    if (!ast) {
      throw new Error('Failed to parse JS code');
    }

    return this.ast = functionAST;
  }

  traceFunctionAST(ast) {
    const { contexts, declarations, functions, identifiers, functionCalls } = new FunctionTracer(ast);