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Add a Lua code generator
This is based on the JS generator, with a lot of inspiration from Ellen Spertus's blockly-lua: https://github.com/espertus/blockly-lua All unit tests pass with Lua 5.3.2.
This commit is contained in:
Rodrigo Queiro
166
generators/lua/loops.js
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166
generators/lua/loops.js
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/**
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* @license
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* Visual Blocks Language
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*
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* Copyright 2016 Google Inc.
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* https://developers.google.com/blockly/
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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 Lua for loop blocks.
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* @author rodrigoq@google.com (Rodrigo Queiro)
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*/
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'use strict';
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goog.provide('Blockly.Lua.loops');
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goog.require('Blockly.Lua');
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/**
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* This is the text used to implement a <pre>continue</pre>.
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* It is also used to recognise <pre>continue</pre>s in generated code so that
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* the appropriate label can be put at the end of the loop body.
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* @const {string}
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*/
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Blockly.Lua.CONTINUE_STATEMENT = 'goto continue\n';
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/**
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* If the loop body contains a "goto continue" statement, add a continue label
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* to the loop body. Slightly inefficient, as continue labels will be generated
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* in all outer loops, but this is safer than duplicating the logic of
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* blockToCode.
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*
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* @param {string} branch Generated code of the loop body
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* @return {string} Generated label or '' if unnecessary
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*/
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Blockly.Lua.addContinueLabel = function(branch) {
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if (branch.indexOf(Blockly.Lua.CONTINUE_STATEMENT) > -1) {
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return branch + Blockly.Lua.INDENT + '::continue::\n';
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} else {
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return branch;
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}
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};
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Blockly.Lua['controls_repeat'] = function(block) {
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// Repeat n times (internal number).
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var repeats = parseInt(block.getFieldValue('TIMES'), 10);
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var branch = Blockly.Lua.statementToCode(block, 'DO') || '';
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branch = Blockly.Lua.addContinueLabel(branch);
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var loopVar = Blockly.Lua.variableDB_.getDistinctName(
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'count', Blockly.Variables.NAME_TYPE);
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var code = 'for ' + loopVar + ' = 1, ' + repeats + ' do\n' + branch + 'end\n';
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return code;
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};
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Blockly.Lua['controls_repeat_ext'] = function(block) {
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// Repeat n times (external number).
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var repeats = Blockly.Lua.valueToCode(block, 'TIMES',
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Blockly.Lua.ORDER_NONE) || '0';
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if (Blockly.isNumber(repeats)) {
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repeats = parseInt(repeats, 10);
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} else {
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repeats = 'math.floor(' + repeats + ')';
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}
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var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
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branch = Blockly.Lua.addContinueLabel(branch);
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var loopVar = Blockly.Lua.variableDB_.getDistinctName(
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'count', Blockly.Variables.NAME_TYPE);
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var code = 'for ' + loopVar + ' = 1, ' + repeats + ' do\n' +
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branch + 'end\n';
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return code;
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};
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Blockly.Lua['controls_whileUntil'] = function(block) {
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// Do while/until loop.
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var until = block.getFieldValue('MODE') == 'UNTIL';
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var argument0 = Blockly.Lua.valueToCode(block, 'BOOL',
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until ? Blockly.Lua.ORDER_UNARY :
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Blockly.Lua.ORDER_NONE) || 'false';
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var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
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branch = Blockly.Lua.addLoopTrap(branch, block.id);
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branch = Blockly.Lua.addContinueLabel(branch);
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if (until) {
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argument0 = 'not ' + argument0;
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}
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return 'while ' + argument0 + ' do\n' + branch + 'end\n';
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};
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Blockly.Lua['controls_for'] = function(block) {
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// For loop.
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var variable0 = Blockly.Lua.variableDB_.getName(
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block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
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var startVar = Blockly.Lua.valueToCode(block, 'FROM',
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Blockly.Lua.ORDER_NONE) || '0';
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var endVar = Blockly.Lua.valueToCode(block, 'TO',
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Blockly.Lua.ORDER_NONE) || '0';
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var increment = Blockly.Lua.valueToCode(block, 'BY',
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Blockly.Lua.ORDER_NONE) || '1';
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var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
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branch = Blockly.Lua.addLoopTrap(branch, block.id);
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branch = Blockly.Lua.addContinueLabel(branch);
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var code = '';
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var incValue;
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if (Blockly.isNumber(startVar) && Blockly.isNumber(endVar) &&
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Blockly.isNumber(increment)) {
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// All arguments are simple numbers.
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var up = parseFloat(startVar) <= parseFloat(endVar);
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var step = Math.abs(parseFloat(increment));
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incValue = (up ? '' : '-') + step;
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} else {
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code = '';
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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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incValue = Blockly.Lua.variableDB_.getDistinctName(
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variable0 + '_inc', Blockly.Variables.NAME_TYPE);
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code += incValue + ' = ';
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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 + ') then\n';
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code += Blockly.Lua.INDENT + incValue + ' = -' + incValue + '\n';
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code += 'end\n';
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}
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code += 'for ' + variable0 + ' = ' + startVar + ', ' + endVar +
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', ' + incValue;
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code += ' do\n' + branch + 'end\n';
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return code;
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};
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Blockly.Lua['controls_forEach'] = function(block) {
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// For each loop.
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var variable0 = Blockly.Lua.variableDB_.getName(
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block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
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var argument0 = Blockly.Lua.valueToCode(block, 'LIST',
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Blockly.Lua.ORDER_NONE) || '{}';
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var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
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branch = Blockly.Lua.addContinueLabel(branch);
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var code = 'for _, ' + variable0 + ' in ipairs(' + argument0 + ') do \n' +
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branch + 'end\n';
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return code;
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};
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Blockly.Lua['controls_flow_statements'] = function(block) {
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// Flow statements: continue, break.
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switch (block.getFieldValue('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 Blockly.Lua.CONTINUE_STATEMENT;
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}
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throw 'Unknown flow statement.';
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};
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