Blockly.Python[''] = function()

in generators/python/lists.js [96:173]

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

Blockly.Python['lists_getIndex'] = function(block) {
  // Get element at index.
  // Note: Until January 2013 this block did not have MODE or WHERE inputs.
  var mode = block.getFieldValue('MODE') || 'GET';
  var where = block.getFieldValue('WHERE') || 'FROM_START';
  var listOrder = (where == 'RANDOM') ? Blockly.Python.ORDER_NONE :
      Blockly.Python.ORDER_MEMBER;
  var list = Blockly.Python.valueToCode(block, 'VALUE', listOrder) || '[]';

  switch (where) {
    case 'FIRST':
      if (mode == 'GET') {
        var code = list + '[0]';
        return [code, Blockly.Python.ORDER_MEMBER];
      } else if (mode == 'GET_REMOVE') {
        var code = list + '.pop(0)';
        return [code, Blockly.Python.ORDER_FUNCTION_CALL];
      } else if (mode == 'REMOVE') {
        return list + '.pop(0)\n';
      }
      break;
    case 'LAST':
      if (mode == 'GET') {
        var code = list + '[-1]';
        return [code, Blockly.Python.ORDER_MEMBER];
      } else if (mode == 'GET_REMOVE') {
        var code = list + '.pop()';
        return [code, Blockly.Python.ORDER_FUNCTION_CALL];
      } else if (mode == 'REMOVE') {
        return list + '.pop()\n';
      }
      break;
    case 'FROM_START':
      var at = Blockly.Python.getAdjustedInt(block, 'AT');
      if (mode == 'GET') {
        var code = list + '[' + at + ']';
        return [code, Blockly.Python.ORDER_MEMBER];
      } else if (mode == 'GET_REMOVE') {
        var code = list + '.pop(' + at + ')';
        return [code, Blockly.Python.ORDER_FUNCTION_CALL];
      } else if (mode == 'REMOVE') {
        return list + '.pop(' + at + ')\n';
      }
      break;
    case'FROM_END':
      var at = Blockly.Python.getAdjustedInt(block, 'AT', 1, true);
      if (mode == 'GET') {
        var code = list + '[' + at + ']';
        return [code, Blockly.Python.ORDER_MEMBER];
      } else if (mode == 'GET_REMOVE') {
        var code = list + '.pop(' + at + ')';
        return [code, Blockly.Python.ORDER_FUNCTION_CALL];
      } else if (mode == 'REMOVE') {
        return list + '.pop(' + at + ')\n';
      }
      break;
    case 'RANDOM':
      Blockly.Python.definitions_['import_random'] = 'import random';
      if (mode == 'GET') {
        code = 'random.choice(' + list + ')';
        return [code, Blockly.Python.ORDER_FUNCTION_CALL];
      } else {
        var functionName = Blockly.Python.provideFunction_(
            'lists_remove_random_item',
            ['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(myList):',
              '  x = int(random.random() * len(myList))',
              '  return myList.pop(x)']);
        code = functionName + '(' + list + ')';
        if (mode == 'GET_REMOVE') {
          return [code, Blockly.Python.ORDER_FUNCTION_CALL];
        } else if (mode == 'REMOVE') {
          return code + '\n';
        }
      }
      break;
  }
  throw Error('Unhandled combination (lists_getIndex).');
};