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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 procedure blocks.
* @author rodrigoq@google.com (Rodrigo Queiro)
*/
'use strict';
goog.provide('Blockly.Lua.procedures');
goog.require('Blockly.Lua');
Blockly.Lua['procedures_defreturn'] = function(block) {
// Define a procedure with a return value.
var funcName = Blockly.Lua.variableDB_.getName(
block.getFieldValue('NAME'), Blockly.Procedures.NAME_TYPE);
var branch = Blockly.Lua.statementToCode(block, 'STACK');
if (Blockly.Lua.STATEMENT_PREFIX) {
branch = Blockly.Lua.prefixLines(
Blockly.Lua.STATEMENT_PREFIX.replace(/%1/g,
'\'' + block.id + '\''), Blockly.Lua.INDENT) + branch;
}
if (Blockly.Lua.INFINITE_LOOP_TRAP) {
branch = Blockly.Lua.INFINITE_LOOP_TRAP.replace(/%1/g,
'\'' + block.id + '\'') + branch;
}
var returnValue = Blockly.Lua.valueToCode(block, 'RETURN',
Blockly.Lua.ORDER_NONE) || '';
if (returnValue) {
returnValue = ' return ' + returnValue + '\n';
} else if (!branch) {
branch = '';
}
var args = [];
for (var i = 0; i < block.arguments_.length; i++) {
args[i] = Blockly.Lua.variableDB_.getName(block.arguments_[i],
Blockly.Variables.NAME_TYPE);
}
var code = 'function ' + funcName + '(' + args.join(', ') + ')\n' +
branch + returnValue + 'end\n';
code = Blockly.Lua.scrub_(block, code);
// Add % so as not to collide with helper functions in definitions list.
Blockly.Lua.definitions_['%' + funcName] = code;
return null;
};
// Defining a procedure without a return value uses the same generator as
// a procedure with a return value.
Blockly.Lua['procedures_defnoreturn'] =
Blockly.Lua['procedures_defreturn'];
Blockly.Lua['procedures_callreturn'] = function(block) {
// Call a procedure with a return value.
var funcName = Blockly.Lua.variableDB_.getName(
block.getFieldValue('NAME'), Blockly.Procedures.NAME_TYPE);
var args = [];
for (var i = 0; i < block.arguments_.length; i++) {
args[i] = Blockly.Lua.valueToCode(block, 'ARG' + i,
Blockly.Lua.ORDER_NONE) || 'nil';
}
var code = funcName + '(' + args.join(', ') + ')';
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['procedures_callnoreturn'] = function(block) {
// Call a procedure with no return value.
var funcName = Blockly.Lua.variableDB_.getName(
block.getFieldValue('NAME'), Blockly.Procedures.NAME_TYPE);
var args = [];
for (var i = 0; i < block.arguments_.length; i++) {
args[i] = Blockly.Lua.valueToCode(block, 'ARG' + i,
Blockly.Lua.ORDER_NONE) || 'nil';
}
var code = funcName + '(' + args.join(', ') + ')\n';
return code;
};
Blockly.Lua['procedures_ifreturn'] = function(block) {
// Conditionally return value from a procedure.
var condition = Blockly.Lua.valueToCode(block, 'CONDITION',
Blockly.Lua.ORDER_NONE) || 'false';
var code = 'if ' + condition + ' then\n';
if (block.hasReturnValue_) {
var value = Blockly.Lua.valueToCode(block, 'VALUE',
Blockly.Lua.ORDER_NONE) || 'nil';
code += ' return ' + value + '\n';
} else {
code += ' return\n';
}
code += 'end\n';
return code;
};
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