Blockly.Python[''] = function()

in generators/python/math.js [61:139]

• 73 lines of code
• 24 McCabe index (conditional complexity)

Blockly.Python['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.
    var code = Blockly.Python.valueToCode(block, 'NUM',
        Blockly.Python.ORDER_UNARY_SIGN) || '0';
    return ['-' + code, Blockly.Python.ORDER_UNARY_SIGN];
  }
  Blockly.Python.definitions_['import_math'] = 'import math';
  if (operator == 'SIN' || operator == 'COS' || operator == 'TAN') {
    arg = Blockly.Python.valueToCode(block, 'NUM',
        Blockly.Python.ORDER_MULTIPLICATIVE) || '0';
  } else {
    arg = Blockly.Python.valueToCode(block, 'NUM',
        Blockly.Python.ORDER_NONE) || '0';
  }
  // First, handle cases which generate values that don't need parentheses
  // wrapping the code.
  switch (operator) {
    case 'ABS':
      code = 'math.fabs(' + arg + ')';
      break;
    case 'ROOT':
      code = 'math.sqrt(' + arg + ')';
      break;
    case 'LN':
      code = 'math.log(' + arg + ')';
      break;
    case 'LOG10':
      code = 'math.log10(' + arg + ')';
      break;
    case 'EXP':
      code = 'math.exp(' + arg + ')';
      break;
    case 'POW10':
      code = 'math.pow(10,' + arg + ')';
      break;
    case 'ROUND':
      code = 'round(' + arg + ')';
      break;
    case 'ROUNDUP':
      code = 'math.ceil(' + arg + ')';
      break;
    case 'ROUNDDOWN':
      code = 'math.floor(' + arg + ')';
      break;
    case 'SIN':
      code = 'math.sin(' + arg + ' / 180.0 * math.pi)';
      break;
    case 'COS':
      code = 'math.cos(' + arg + ' / 180.0 * math.pi)';
      break;
    case 'TAN':
      code = 'math.tan(' + arg + ' / 180.0 * math.pi)';
      break;
  }
  if (code) {
    return [code, Blockly.Python.ORDER_FUNCTION_CALL];
  }
  // Second, handle cases which generate values that may need parentheses
  // wrapping the code.
  switch (operator) {
    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.Python.ORDER_MULTIPLICATIVE];
};