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/**
* @license
* Visual Blocks Language
*
* Copyright 2012 Google Inc.
* https://developers.google.com/blockly/
*
* 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 Python for logic blocks.
* @author q.neutron@gmail.com (Quynh Neutron)
*/
'use strict';
goog.provide('Blockly.Python.logic');
goog.require('Blockly.Python');
Blockly.Python['controls_if'] = function(block) {
// If/elseif/else condition.
var n = 0;
var code = '', branchCode, conditionCode;
do {
conditionCode = Blockly.Python.valueToCode(block, 'IF' + n,
Blockly.Python.ORDER_NONE) || '___';
branchCode = Blockly.Python.statementToCode(block, 'DO' + n) ||
Blockly.Python.PASS;
code += (n == 0 ? 'if ' : 'elif ' ) + conditionCode + ':\n' + branchCode;
++n;
} while (block.getInput('IF' + n));
if (block.getInput('ELSE')) {
branchCode = Blockly.Python.statementToCode(block, 'ELSE') ||
Blockly.Python.PASS;
code += 'else:\n' + branchCode;
}
return code;
};
Blockly.Python['logic_compare'] = function(block) {
// Comparison operator.
var OPERATORS = {
'EQ': '==',
'NEQ': '!=',
'LT': '<',
'LTE': '<=',
'GT': '>',
'GTE': '>='
};
var operator = OPERATORS[block.getFieldValue('OP')];
var order = Blockly.Python.ORDER_RELATIONAL;
var argument0 = Blockly.Python.valueToCode(block, 'A', order) || '___';
var argument1 = Blockly.Python.valueToCode(block, 'B', order) || '___';
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};
Blockly.Python['logic_operation'] = function(block) {
// Operations 'and', 'or'.
var operator = (block.getFieldValue('OP') == 'AND') ? 'and' : 'or';
var order = (operator == 'and') ? Blockly.Python.ORDER_LOGICAL_AND :
Blockly.Python.ORDER_LOGICAL_OR;
var argument0 = Blockly.Python.valueToCode(block, 'A', order);
var argument1 = Blockly.Python.valueToCode(block, 'B', order);
if (!argument0 && !argument1) {
// If there are no arguments, then the return value is false.
argument0 = '___';
argument1 = '___';
} else {
// Single missing arguments have no effect on the return value.
var defaultArgument = (operator == 'and') ? '___' : '___';
if (!argument0) {
argument0 = defaultArgument;
}
if (!argument1) {
argument1 = defaultArgument;
}
}
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};
Blockly.Python['logic_negate'] = function(block) {
// Negation.
var argument0 = Blockly.Python.valueToCode(block, 'BOOL',
Blockly.Python.ORDER_LOGICAL_NOT) || '___';
var code = 'not ' + argument0;
return [code, Blockly.Python.ORDER_LOGICAL_NOT];
};
Blockly.Python['logic_boolean'] = function(block) {
// Boolean values true and false.
var code = (block.getFieldValue('BOOL') == 'TRUE') ? 'True' : 'False';
return [code, Blockly.Python.ORDER_ATOMIC];
};
Blockly.Python['logic_null'] = function(block) {
// Null data type.
return ['None', Blockly.Python.ORDER_ATOMIC];
};
Blockly.Python['logic_ternary'] = function(block) {
// Ternary operator.
var value_if = Blockly.Python.valueToCode(block, 'IF',
Blockly.Python.ORDER_CONDITIONAL) || '___';
var value_then = Blockly.Python.valueToCode(block, 'THEN',
Blockly.Python.ORDER_CONDITIONAL) || '___';
var value_else = Blockly.Python.valueToCode(block, 'ELSE',
Blockly.Python.ORDER_CONDITIONAL) || '___';
var code = value_then + ' if ' + value_if + ' else ' + value_else;
return [code, Blockly.Python.ORDER_CONDITIONAL];
};
Blockly.Python['logic_isIn'] = function(block) {
// Operations 'in', 'not in'.
var operator = (block.getFieldValue('OP') == 'IN') ? 'in' : 'not in';
var order = Blockly.Python.ORDER_RELATIONAL;
var argument0 = Blockly.Python.valueToCode(block, 'ITEM', order) || '___';
var argument1 = Blockly.Python.valueToCode(block, 'LIST', order) || '___';
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};