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/**
* @license
* Visual Blocks Language
*
* Copyright 2015 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 PHP for loop blocks.
* @author daarond@gmail.com (Daaron Dwyer)
*/
'use strict';
goog.provide('Blockly.PHP.loops');
goog.require('Blockly.PHP');
Blockly.PHP['controls_repeat_ext'] = function(block) {
// Repeat n times.
if (block.getField('TIMES')) {
// Internal number.
var repeats = String(Number(block.getFieldValue('TIMES')));
} else {
// External number.
var repeats = Blockly.PHP.valueToCode(block, 'TIMES',
Blockly.PHP.ORDER_ASSIGNMENT) || '0';
}
var branch = Blockly.PHP.statementToCode(block, 'DO');
branch = Blockly.PHP.addLoopTrap(branch, block.id);
var code = '';
var loopVar = Blockly.PHP.variableDB_.getDistinctName(
'count', Blockly.Variables.NAME_TYPE);
var endVar = repeats;
if (!repeats.match(/^\w+$/) && !Blockly.isNumber(repeats)) {
var endVar = Blockly.PHP.variableDB_.getDistinctName(
'repeat_end', Blockly.Variables.NAME_TYPE);
code += endVar + ' = ' + repeats + ';\n';
}
code += 'for (' + loopVar + ' = 0; ' +
loopVar + ' < ' + endVar + '; ' +
loopVar + '++) {\n' +
branch + '}\n';
return code;
};
Blockly.PHP['controls_repeat'] = Blockly.PHP['controls_repeat_ext'];
Blockly.PHP['controls_whileUntil'] = function(block) {
// Do while/until loop.
var until = block.getFieldValue('MODE') == 'UNTIL';
var argument0 = Blockly.PHP.valueToCode(block, 'BOOL',
until ? Blockly.PHP.ORDER_LOGICAL_NOT :
Blockly.PHP.ORDER_NONE) || 'false';
var branch = Blockly.PHP.statementToCode(block, 'DO');
branch = Blockly.PHP.addLoopTrap(branch, block.id);
if (until) {
argument0 = '!' + argument0;
}
return 'while (' + argument0 + ') {\n' + branch + '}\n';
};
Blockly.PHP['controls_for'] = function(block) {
// For loop.
var variable0 = Blockly.PHP.variableDB_.getName(
block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
var argument0 = Blockly.PHP.valueToCode(block, 'FROM',
Blockly.PHP.ORDER_ASSIGNMENT) || '0';
var argument1 = Blockly.PHP.valueToCode(block, 'TO',
Blockly.PHP.ORDER_ASSIGNMENT) || '0';
var increment = Blockly.PHP.valueToCode(block, 'BY',
Blockly.PHP.ORDER_ASSIGNMENT) || '1';
var branch = Blockly.PHP.statementToCode(block, 'DO');
branch = Blockly.PHP.addLoopTrap(branch, block.id);
var code;
if (Blockly.isNumber(argument0) && Blockly.isNumber(argument1) &&
Blockly.isNumber(increment)) {
// All arguments are simple numbers.
var up = parseFloat(argument0) <= parseFloat(argument1);
code = 'for (' + variable0 + ' = ' + argument0 + '; ' +
variable0 + (up ? ' <= ' : ' >= ') + argument1 + '; ' +
variable0;
var step = Math.abs(parseFloat(increment));
if (step == 1) {
code += up ? '++' : '--';
} else {
code += (up ? ' += ' : ' -= ') + step;
}
code += ') {\n' + branch + '}\n';
} else {
code = '';
// Cache non-trivial values to variables to prevent repeated look-ups.
var startVar = argument0;
if (!argument0.match(/^\w+$/) && !Blockly.isNumber(argument0)) {
startVar = Blockly.PHP.variableDB_.getDistinctName(
variable0 + '_start', Blockly.Variables.NAME_TYPE);
code += startVar + ' = ' + argument0 + ';\n';
}
var endVar = argument1;
if (!argument1.match(/^\w+$/) && !Blockly.isNumber(argument1)) {
var endVar = Blockly.PHP.variableDB_.getDistinctName(
variable0 + '_end', Blockly.Variables.NAME_TYPE);
code += endVar + ' = ' + argument1 + ';\n';
}
// Determine loop direction at start, in case one of the bounds
// changes during loop execution.
var incVar = Blockly.PHP.variableDB_.getDistinctName(
variable0 + '_inc', Blockly.Variables.NAME_TYPE);
code += incVar + ' = ';
if (Blockly.isNumber(increment)) {
code += Math.abs(increment) + ';\n';
} else {
code += 'abs(' + increment + ');\n';
}
code += 'if (' + startVar + ' > ' + endVar + ') {\n';
code += Blockly.PHP.INDENT + incVar + ' = -' + incVar + ';\n';
code += '}\n';
code += 'for (' + variable0 + ' = ' + startVar + '; ' +
incVar + ' >= 0 ? ' +
variable0 + ' <= ' + endVar + ' : ' +
variable0 + ' >= ' + endVar + '; ' +
variable0 + ' += ' + incVar + ') {\n' +
branch + '}\n';
}
return code;
};
Blockly.PHP['controls_forEach'] = function(block) {
// For each loop.
var variable0 = Blockly.PHP.variableDB_.getName(
block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
var argument0 = Blockly.PHP.valueToCode(block, 'LIST',
Blockly.PHP.ORDER_ASSIGNMENT) || '[]';
var branch = Blockly.PHP.statementToCode(block, 'DO');
branch = Blockly.PHP.addLoopTrap(branch, block.id);
var code = '';
code += 'foreach (' + argument0 + ' as ' + variable0 +
') {\n' + branch + '}\n';
return code;
};
Blockly.PHP['controls_flow_statements'] = function(block) {
// Flow statements: continue, break.
switch (block.getFieldValue('FLOW')) {
case 'BREAK':
return 'break;\n';
case 'CONTINUE':
return 'continue;\n';
}
throw 'Unknown flow statement.';
};
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