generators/cake/logic.js
/**
* @license
* Visual Blocks Language
*
* Copyright 2012 Google Inc.
* https://blockly.googlecode.com/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileoverview Generating cake for logic blocks.
* @author q.neutron@gmail.com (Quynh Neutron)
*/
'use strict';
goog.provide('Blockly.cake.logic');
goog.require('Blockly.cake');
Blockly.cake['controls_if'] = function(block) {
// If/elseif/else condition.
var n = 0;
var argument = Blockly.cake.valueToCode(block, 'IF' + n,
Blockly.cake.ORDER_NONE) || '0';
var branch = Blockly.cake.statementToCode(block, 'DO' + n);
var code = 'if (' + argument + ') {\n' + branch + '}';
for (n = 1; n <= block.elseifCount_; n++) {
argument = Blockly.cake.valueToCode(block, 'IF' + n,
Blockly.cake.ORDER_NONE) || '0';
branch = Blockly.cake.statementToCode(block, 'DO' + n);
code += ' else if (' + argument + ') {\n' + branch + '}';
}
if (block.elseCount_) {
branch = Blockly.cake.statementToCode(block, 'ELSE');
code += ' else {\n' + branch + '}';
}
return code + '\n';
};
Blockly.cake['logic_compare'] = function(block) {
// Comparison operator.
var OPERATORS = {
'EQ': '==',
'NEQ': '!=',
'LT': '<',
'LTE': '<=',
'GT': '>',
'GTE': '>='
};
var operator = OPERATORS[block.getFieldValue('OP')];
var order = (operator == '==' || operator == '!=') ?
Blockly.cake.ORDER_EQUALITY : Blockly.cake.ORDER_RELATIONAL;
var argument0 = Blockly.cake.valueToCode(block, 'A', order) || '0';
var argument1 = Blockly.cake.valueToCode(block, 'B', order) || '0';
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};
Blockly.cake['logic_operation'] = function(block) {
// Operations 'and', 'or'.
var operator = (block.getFieldValue('OP') == 'AND') ? '&&' : '||';
var order = (operator == '&&') ? Blockly.cake.ORDER_LOGICAL_AND :
Blockly.cake.ORDER_LOGICAL_OR;
var argument0 = Blockly.cake.valueToCode(block, 'A', order);
var argument1 = Blockly.cake.valueToCode(block, 'B', order);
if (!argument0 && !argument1) {
// If there are no arguments, then the return value is false.
argument0 = '0';
argument1 = '0';
} else {
// Single missing arguments have no effect on the return value.
var defaultArgument = (operator == '&&') ? '1' : '0';
if (!argument0) {
argument0 = defaultArgument;
}
if (!argument1) {
argument1 = defaultArgument;
}
}
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};
Blockly.cake['logic_negate'] = function(block) {
// Negation.
var order = Blockly.cake.ORDER_LOGICAL_NOT;
var argument0 = Blockly.cake.valueToCode(block, 'BOOL', order) ||
'1';
var code = '!' + argument0;
return [code, order];
};
Blockly.cake['logic_boolean'] = function(block) {
// Boolean values true and false.
var code = (block.getFieldValue('BOOL') == 'TRUE') ? '1' : '0';
return [code, Blockly.cake.ORDER_ATOMIC];
};
Blockly.cake['logic_null'] = function(block) {
// Null data type.
return ['null', Blockly.cake.ORDER_ATOMIC];
};
Blockly.cake['logic_ternary'] = function(block) {
// Ternary operator.
var value_if = Blockly.cake.valueToCode(block, 'IF',
Blockly.cake.ORDER_CONDITIONAL) || '0';
var value_then = Blockly.cake.valueToCode(block, 'THEN',
Blockly.cake.ORDER_CONDITIONAL) || 'null';
var value_else = Blockly.cake.valueToCode(block, 'ELSE',
Blockly.cake.ORDER_CONDITIONAL) || 'null';
var code = value_if + ' ? ' + value_then + ' : ' + value_else;
return [code, Blockly.cake.ORDER_CONDITIONAL];
};
Blockly.cake['controls_switch'] = function(block) {
var n = 0;
var condition = Blockly.cake.valueToCode(block, 'SWITCH', Blockly.cake.ORDER_NONE) || '0';
var argument = Blockly.cake.valueToCode(block, 'CASE' + n,
Blockly.cake.ORDER_NONE) || n;
var branch = Blockly.cake.statementToCode(block, 'DO' + n);
var defaultBranch = Blockly.cake.statementToCode(block, 'DEFAULT');
var code = 'switch (' + condition + ') {\n'+'\ncase ' + argument + ' : \n'+ branch;
for (n = 1; n <= block.caseCount_; n++) {
argument = Blockly.cake.valueToCode(block, 'CASE' + n,
Blockly.cake.ORDER_NONE) || n;
branch = Blockly.cake.statementToCode(block, 'DO' + n);
code += '\ncase ' + argument + ' : ' + '\n' + branch;
}
return code + '\ndefault : \n' + defaultBranch +'}\n';
};
Blockly.cake['controls_switch_break'] = function(block) {
return 'break;\n';
}