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generators/javascript/loops.js
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generators/javascript/loops.js
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/**
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* Visual Blocks Language
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*
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* Copyright 2012 Google Inc.
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* http://blockly.googlecode.com/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Generating JavaScript for loop blocks.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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goog.provide('Blockly.JavaScript.loops');
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goog.require('Blockly.JavaScript');
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Blockly.JavaScript['controls_repeat'] = function(block) {
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// Repeat n times (internal number).
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var repeats = Number(block.getTitleValue('TIMES'));
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var branch = Blockly.JavaScript.statementToCode(block, 'DO');
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if (Blockly.JavaScript.INFINITE_LOOP_TRAP) {
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branch = Blockly.JavaScript.INFINITE_LOOP_TRAP.replace(/%1/g,
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'\'' + block.id + '\'') + branch;
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}
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var loopVar = Blockly.JavaScript.variableDB_.getDistinctName(
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'count', Blockly.Variables.NAME_TYPE);
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var code = 'for (var ' + loopVar + ' = 0; ' +
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loopVar + ' < ' + repeats + '; ' +
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loopVar + '++) {\n' +
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branch + '}\n';
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return code;
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};
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Blockly.JavaScript['controls_repeat_ext'] = function(block) {
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// Repeat n times (external number).
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var repeats = Blockly.JavaScript.valueToCode(block, 'TIMES',
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Blockly.JavaScript.ORDER_ASSIGNMENT) || '0';
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var branch = Blockly.JavaScript.statementToCode(block, 'DO');
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if (Blockly.JavaScript.INFINITE_LOOP_TRAP) {
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branch = Blockly.JavaScript.INFINITE_LOOP_TRAP.replace(/%1/g,
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'\'' + block.id + '\'') + branch;
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}
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var code = '';
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var loopVar = Blockly.JavaScript.variableDB_.getDistinctName(
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'count', Blockly.Variables.NAME_TYPE);
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var endVar = repeats;
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if (!repeats.match(/^\w+$/) && !Blockly.isNumber(repeats)) {
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var endVar = Blockly.JavaScript.variableDB_.getDistinctName(
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'repeat_end', Blockly.Variables.NAME_TYPE);
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code += 'var ' + endVar + ' = ' + repeats + ';\n';
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}
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code += 'for (var ' + loopVar + ' = 0; ' +
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loopVar + ' < ' + endVar + '; ' +
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loopVar + '++) {\n' +
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branch + '}\n';
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return code;
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};
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Blockly.JavaScript['controls_whileUntil'] = function(block) {
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// Do while/until loop.
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var until = block.getTitleValue('MODE') == 'UNTIL';
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var argument0 = Blockly.JavaScript.valueToCode(block, 'BOOL',
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until ? Blockly.JavaScript.ORDER_LOGICAL_NOT :
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Blockly.JavaScript.ORDER_NONE) || 'false';
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var branch = Blockly.JavaScript.statementToCode(block, 'DO');
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if (Blockly.JavaScript.INFINITE_LOOP_TRAP) {
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branch = Blockly.JavaScript.INFINITE_LOOP_TRAP.replace(/%1/g,
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'\'' + block.id + '\'') + branch;
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}
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if (until) {
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argument0 = '!' + argument0;
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}
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return 'while (' + argument0 + ') {\n' + branch + '}\n';
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};
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Blockly.JavaScript['controls_for'] = function(block) {
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// For loop.
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var variable0 = Blockly.JavaScript.variableDB_.getName(
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block.getTitleValue('VAR'), Blockly.Variables.NAME_TYPE);
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var argument0 = Blockly.JavaScript.valueToCode(block, 'FROM',
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Blockly.JavaScript.ORDER_ASSIGNMENT) || '0';
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var argument1 = Blockly.JavaScript.valueToCode(block, 'TO',
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Blockly.JavaScript.ORDER_ASSIGNMENT) || '0';
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var increment = Blockly.JavaScript.valueToCode(block, 'BY',
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Blockly.JavaScript.ORDER_ASSIGNMENT) || '1';
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var branch = Blockly.JavaScript.statementToCode(block, 'DO');
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if (Blockly.JavaScript.INFINITE_LOOP_TRAP) {
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branch = Blockly.JavaScript.INFINITE_LOOP_TRAP.replace(/%1/g,
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'\'' + block.id + '\'') + branch;
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}
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var code;
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if (Blockly.isNumber(argument0) && Blockly.isNumber(argument1) &&
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Blockly.isNumber(increment)) {
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// All arguments are simple numbers.
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var up = parseFloat(argument0) <= parseFloat(argument1);
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code = 'for (' + variable0 + ' = ' + argument0 + '; ' +
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variable0 + (up ? ' <= ' : ' >= ') + argument1 + '; ' +
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variable0;
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var step = Math.abs(parseFloat(increment));
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if (step == 1) {
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code += up ? '++' : '--';
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} else {
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code += (up ? ' += ' : ' -= ') + step;
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}
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code += ') {\n' + branch + '}\n';
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} else {
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code = '';
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// Cache non-trivial values to variables to prevent repeated look-ups.
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var startVar = argument0;
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if (!argument0.match(/^\w+$/) && !Blockly.isNumber(argument0)) {
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var startVar = Blockly.JavaScript.variableDB_.getDistinctName(
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variable0 + '_start', Blockly.Variables.NAME_TYPE);
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code += 'var ' + startVar + ' = ' + argument0 + ';\n';
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}
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var endVar = argument1;
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if (!argument1.match(/^\w+$/) && !Blockly.isNumber(argument1)) {
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var endVar = Blockly.JavaScript.variableDB_.getDistinctName(
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variable0 + '_end', Blockly.Variables.NAME_TYPE);
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code += 'var ' + endVar + ' = ' + argument1 + ';\n';
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}
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// Determine loop direction at start, in case one of the bounds
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// changes during loop execution.
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var incVar = Blockly.JavaScript.variableDB_.getDistinctName(
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variable0 + '_inc', Blockly.Variables.NAME_TYPE);
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code += 'var ' + incVar + ' = ';
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if (Blockly.isNumber(increment)) {
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code += Math.abs(increment) + ';\n';
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} else {
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code += 'Math.abs(' + increment + ');\n';
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}
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code += 'if (' + startVar + ' > ' + endVar + ') {\n';
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code += ' ' + incVar + ' = -' + incVar +';\n';
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code += '}\n';
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code += 'for (' + variable0 + ' = ' + startVar + ';\n' +
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' ' + incVar + ' >= 0 ? ' +
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variable0 + ' <= ' + endVar + ' : ' +
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variable0 + ' >= ' + endVar + ';\n' +
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' ' + variable0 + ' += ' + incVar + ') {\n' +
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branch + '}\n';
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}
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return code;
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};
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Blockly.JavaScript['controls_forEach'] = function(block) {
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// For each loop.
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var variable0 = Blockly.JavaScript.variableDB_.getName(
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block.getTitleValue('VAR'), Blockly.Variables.NAME_TYPE);
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var argument0 = Blockly.JavaScript.valueToCode(block, 'LIST',
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Blockly.JavaScript.ORDER_ASSIGNMENT) || '[]';
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var branch = Blockly.JavaScript.statementToCode(block, 'DO');
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if (Blockly.JavaScript.INFINITE_LOOP_TRAP) {
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branch = Blockly.JavaScript.INFINITE_LOOP_TRAP.replace(/%1/g,
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'\'' + block.id + '\'') + branch;
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}
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var code;
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var indexVar = Blockly.JavaScript.variableDB_.getDistinctName(
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variable0 + '_index', Blockly.Variables.NAME_TYPE);
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if (argument0.match(/^\w+$/)) {
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branch = ' ' + variable0 + ' = ' + argument0 + '[' + indexVar + '];\n' +
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branch;
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code = 'for (var ' + indexVar + ' in ' + argument0 + ') {\n' +
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branch + '}\n';
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} else {
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// The list appears to be more complicated than a simple variable.
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// Cache it to a variable to prevent repeated look-ups.
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var listVar = Blockly.JavaScript.variableDB_.getDistinctName(
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variable0 + '_list', Blockly.Variables.NAME_TYPE);
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branch = ' ' + variable0 + ' = ' + listVar + '[' + indexVar + '];\n' +
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branch;
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code = 'var ' + listVar + ' = ' + argument0 + ';\n' +
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'for (var ' + indexVar + ' in ' + listVar + ') {\n' +
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branch + '}\n';
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}
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return code;
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};
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Blockly.JavaScript['controls_flow_statements'] = function(block) {
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// Flow statements: continue, break.
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switch (block.getTitleValue('FLOW')) {
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case 'BREAK':
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return 'break;\n';
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case 'CONTINUE':
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return 'continue;\n';
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}
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throw 'Unknown flow statement.';
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};
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