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/**
* @license
* Visual Blocks Language
*
* Copyright 2016 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 Lua for logic blocks.
* @author rodrigoq@google.com (Rodrigo Queiro)
*/
'use strict';
goog.provide('Blockly.Lua.logic');
goog.require('Blockly.Lua');
Blockly.Lua['controls_if'] = function(block) {
// If/elseif/else condition.
var n = 0;
var argument = Blockly.Lua.valueToCode(block, 'IF' + n,
Blockly.Lua.ORDER_NONE) || 'false';
var branch = Blockly.Lua.statementToCode(block, 'DO' + n);
var code = 'if ' + argument + ' then\n' + branch;
for (n = 1; n <= block.elseifCount_; n++) {
argument = Blockly.Lua.valueToCode(block, 'IF' + n,
Blockly.Lua.ORDER_NONE) || 'false';
branch = Blockly.Lua.statementToCode(block, 'DO' + n);
code += ' elseif ' + argument + ' then\n' + branch;
}
if (block.elseCount_) {
branch = Blockly.Lua.statementToCode(block, 'ELSE');
code += ' else\n' + branch;
}
return code + 'end\n';
};
Blockly.Lua['logic_compare'] = function(block) {
// Comparison operator.
var OPERATORS = {
'EQ': '==',
'NEQ': '~=',
'LT': '<',
'LTE': '<=',
'GT': '>',
'GTE': '>='
};
var operator = OPERATORS[block.getFieldValue('OP')];
var argument0 = Blockly.Lua.valueToCode(block, 'A',
Blockly.Lua.ORDER_RELATIONAL) || '0';
var argument1 = Blockly.Lua.valueToCode(block, 'B',
Blockly.Lua.ORDER_RELATIONAL) || '0';
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, Blockly.Lua.ORDER_RELATIONAL];
};
Blockly.Lua['logic_operation'] = function(block) {
// Operations 'and', 'or'.
var operator = (block.getFieldValue('OP') == 'AND') ? 'and' : 'or';
var order = (operator == 'and') ? Blockly.Lua.ORDER_AND :
Blockly.Lua.ORDER_OR;
var argument0 = Blockly.Lua.valueToCode(block, 'A', order);
var argument1 = Blockly.Lua.valueToCode(block, 'B', order);
if (!argument0 && !argument1) {
// If there are no arguments, then the return value is false.
argument0 = 'false';
argument1 = 'false';
} else {
// Single missing arguments have no effect on the return value.
var defaultArgument = (operator == 'and') ? 'true' : 'false';
if (!argument0) {
argument0 = defaultArgument;
}
if (!argument1) {
argument1 = defaultArgument;
}
}
var code = argument0 + ' ' + operator + ' ' + argument1;
return [code, order];
};
Blockly.Lua['logic_negate'] = function(block) {
// Negation.
var argument0 = Blockly.Lua.valueToCode(block, 'BOOL',
Blockly.Lua.ORDER_UNARY) || 'true';
var code = 'not ' + argument0;
return [code, Blockly.Lua.ORDER_UNARY];
};
Blockly.Lua['logic_boolean'] = function(block) {
// Boolean values true and false.
var code = (block.getFieldValue('BOOL') == 'TRUE') ? 'true' : 'false';
return [code, Blockly.Lua.ORDER_ATOMIC];
};
Blockly.Lua['logic_null'] = function(block) {
// Null data type.
return ['nil', Blockly.Lua.ORDER_ATOMIC];
};
Blockly.Lua['logic_ternary'] = function(block) {
// Ternary operator.
var value_if = Blockly.Lua.valueToCode(block, 'IF',
Blockly.Lua.ORDER_AND) || 'false';
var value_then = Blockly.Lua.valueToCode(block, 'THEN',
Blockly.Lua.ORDER_AND) || 'nil';
var value_else = Blockly.Lua.valueToCode(block, 'ELSE',
Blockly.Lua.ORDER_OR) || 'nil';
var code = value_if + ' and ' + value_then + ' or ' + value_else;
return [code, Blockly.Lua.ORDER_OR];
};
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