Blockly.JavaScript[''] = function()

in generators/javascript/math.js [50:132]

• 76 lines of code
• 25 McCabe index (conditional complexity)

Blockly.JavaScript['math_single'] = function(block) {
  // Math operators with single operand.
  var operator = block.getFieldValue('OP');
  var code;
  var arg;
  if (operator == 'NEG') {
    // Negation is a special case given its different operator precedence.
    arg = Blockly.JavaScript.valueToCode(block, 'NUM',
        Blockly.JavaScript.ORDER_UNARY_NEGATION) || '0';
    if (arg[0] == '-') {
      // --3 is not legal in JS.
      arg = ' ' + arg;
    }
    code = '-' + arg;
    return [code, Blockly.JavaScript.ORDER_UNARY_NEGATION];
  }
  if (operator == 'SIN' || operator == 'COS' || operator == 'TAN') {
    arg = Blockly.JavaScript.valueToCode(block, 'NUM',
        Blockly.JavaScript.ORDER_DIVISION) || '0';
  } else {
    arg = Blockly.JavaScript.valueToCode(block, 'NUM',
        Blockly.JavaScript.ORDER_NONE) || '0';
  }
  // First, handle cases which generate values that don't need parentheses
  // wrapping the code.
  switch (operator) {
    case 'ABS':
      code = 'Math.abs(' + arg + ')';
      break;
    case 'ROOT':
      code = 'Math.sqrt(' + arg + ')';
      break;
    case 'LN':
      code = 'Math.log(' + arg + ')';
      break;
    case 'EXP':
      code = 'Math.exp(' + arg + ')';
      break;
    case 'POW10':
      code = 'Math.pow(10,' + arg + ')';
      break;
    case 'ROUND':
      code = 'Math.round(' + arg + ')';
      break;
    case 'ROUNDUP':
      code = 'Math.ceil(' + arg + ')';
      break;
    case 'ROUNDDOWN':
      code = 'Math.floor(' + arg + ')';
      break;
    case 'SIN':
      code = 'Math.sin(' + arg + ' / 180 * Math.PI)';
      break;
    case 'COS':
      code = 'Math.cos(' + arg + ' / 180 * Math.PI)';
      break;
    case 'TAN':
      code = 'Math.tan(' + arg + ' / 180 * Math.PI)';
      break;
  }
  if (code) {
    return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
  }
  // Second, handle cases which generate values that may need parentheses
  // wrapping the code.
  switch (operator) {
    case 'LOG10':
      code = 'Math.log(' + arg + ') / Math.log(10)';
      break;
    case 'ASIN':
      code = 'Math.asin(' + arg + ') / Math.PI * 180';
      break;
    case 'ACOS':
      code = 'Math.acos(' + arg + ') / Math.PI * 180';
      break;
    case 'ATAN':
      code = 'Math.atan(' + arg + ') / Math.PI * 180';
      break;
    default:
      throw Error('Unknown math operator: ' + operator);
  }
  return [code, Blockly.JavaScript.ORDER_DIVISION];
};