mirror of
https://github.com/google/blockly.git
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90b3f75d82
Our files are up to a decade old, and have churned so much, that the initial author of the file no longer has much meaning. Furthermore, this will encourage developers to post to the developer group, rather than emailing Googlers (usually me) directly.
355 lines
12 KiB
JavaScript
355 lines
12 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Generating Lua for text blocks.
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*/
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'use strict';
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goog.provide('Blockly.Lua.texts');
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goog.require('Blockly.Lua');
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Blockly.Lua['text'] = function(block) {
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// Text value.
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var code = Blockly.Lua.quote_(block.getFieldValue('TEXT'));
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return [code, Blockly.Lua.ORDER_ATOMIC];
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};
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Blockly.Lua['text_multiline'] = function(block) {
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// Text value.
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var code = Blockly.Lua.multiline_quote_(block.getFieldValue('TEXT'));
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var order = code.indexOf('..') !== -1 ? Blockly.Lua.ORDER_CONCATENATION :
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Blockly.Lua.ORDER_ATOMIC;
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return [code, order];
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};
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Blockly.Lua['text_join'] = function(block) {
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// Create a string made up of any number of elements of any type.
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if (block.itemCount_ === 0) {
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return ['\'\'', Blockly.Lua.ORDER_ATOMIC];
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} else if (block.itemCount_ === 1) {
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var element = Blockly.Lua.valueToCode(block, 'ADD0',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var code = 'tostring(' + element + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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} else if (block.itemCount_ === 2) {
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var element0 = Blockly.Lua.valueToCode(block, 'ADD0',
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Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
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var element1 = Blockly.Lua.valueToCode(block, 'ADD1',
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Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
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var code = element0 + ' .. ' + element1;
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return [code, Blockly.Lua.ORDER_CONCATENATION];
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} else {
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var elements = [];
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for (var i = 0; i < block.itemCount_; i++) {
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elements[i] = Blockly.Lua.valueToCode(block, 'ADD' + i,
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Blockly.Lua.ORDER_NONE) || '\'\'';
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}
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var code = 'table.concat({' + elements.join(', ') + '})';
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return [code, Blockly.Lua.ORDER_HIGH];
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}
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};
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Blockly.Lua['text_append'] = function(block) {
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// Append to a variable in place.
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var varName = Blockly.Lua.nameDB_.getName(
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block.getFieldValue('VAR'), Blockly.VARIABLE_CATEGORY_NAME);
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var value = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
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return varName + ' = ' + varName + ' .. ' + value + '\n';
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};
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Blockly.Lua['text_length'] = function(block) {
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// String or array length.
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var text = Blockly.Lua.valueToCode(block, 'VALUE',
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Blockly.Lua.ORDER_UNARY) || '\'\'';
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return ['#' + text, Blockly.Lua.ORDER_UNARY];
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};
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Blockly.Lua['text_isEmpty'] = function(block) {
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// Is the string null or array empty?
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var text = Blockly.Lua.valueToCode(block, 'VALUE',
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Blockly.Lua.ORDER_UNARY) || '\'\'';
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return ['#' + text + ' == 0', Blockly.Lua.ORDER_RELATIONAL];
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};
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Blockly.Lua['text_indexOf'] = function(block) {
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// Search the text for a substring.
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var substring = Blockly.Lua.valueToCode(block, 'FIND',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var text = Blockly.Lua.valueToCode(block, 'VALUE',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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if (block.getFieldValue('END') === 'FIRST') {
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var functionName = Blockly.Lua.provideFunction_(
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'firstIndexOf',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
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'(str, substr) ',
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' local i = string.find(str, substr, 1, true)',
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' if i == nil then',
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' return 0',
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' else',
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' return i',
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' end',
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'end']);
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} else {
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var functionName = Blockly.Lua.provideFunction_(
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'lastIndexOf',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
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'(str, substr)',
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' local i = string.find(string.reverse(str), ' +
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'string.reverse(substr), 1, true)',
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' if i then',
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' return #str + 2 - i - #substr',
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' end',
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' return 0',
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'end']);
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}
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var code = functionName + '(' + text + ', ' + substring + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_charAt'] = function(block) {
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// Get letter at index.
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// Note: Until January 2013 this block did not have the WHERE input.
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var where = block.getFieldValue('WHERE') || 'FROM_START';
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var atOrder = (where === 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
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Blockly.Lua.ORDER_NONE;
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var at = Blockly.Lua.valueToCode(block, 'AT', atOrder) || '1';
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var text = Blockly.Lua.valueToCode(block, 'VALUE',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var code;
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if (where === 'RANDOM') {
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var functionName = Blockly.Lua.provideFunction_(
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'text_random_letter',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(str)',
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' local index = math.random(string.len(str))',
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' return string.sub(str, index, index)',
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'end']);
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code = functionName + '(' + text + ')';
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} else {
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if (where === 'FIRST') {
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var start = '1';
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} else if (where === 'LAST') {
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var start = '-1';
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} else {
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if (where === 'FROM_START') {
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var start = at;
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} else if (where === 'FROM_END') {
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var start = '-' + at;
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} else {
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throw Error('Unhandled option (text_charAt).');
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}
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}
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if (start.match(/^-?\w*$/)) {
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code = 'string.sub(' + text + ', ' + start + ', ' + start + ')';
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} else {
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// use function to avoid reevaluation
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var functionName = Blockly.Lua.provideFunction_(
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'text_char_at',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
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'(str, index)',
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' return string.sub(str, index, index)',
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'end']);
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code = functionName + '(' + text + ', ' + start + ')';
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}
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}
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_getSubstring'] = function(block) {
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// Get substring.
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var text = Blockly.Lua.valueToCode(block, 'STRING',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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// Get start index.
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var where1 = block.getFieldValue('WHERE1');
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var at1Order = (where1 === 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
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Blockly.Lua.ORDER_NONE;
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var at1 = Blockly.Lua.valueToCode(block, 'AT1', at1Order) || '1';
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if (where1 === 'FIRST') {
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var start = 1;
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} else if (where1 === 'FROM_START') {
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var start = at1;
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} else if (where1 === 'FROM_END') {
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var start = '-' + at1;
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} else {
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throw Error('Unhandled option (text_getSubstring)');
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}
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// Get end index.
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var where2 = block.getFieldValue('WHERE2');
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var at2Order = (where2 === 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
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Blockly.Lua.ORDER_NONE;
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var at2 = Blockly.Lua.valueToCode(block, 'AT2', at2Order) || '1';
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if (where2 === 'LAST') {
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var end = -1;
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} else if (where2 === 'FROM_START') {
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var end = at2;
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} else if (where2 === 'FROM_END') {
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var end = '-' + at2;
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} else {
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throw Error('Unhandled option (text_getSubstring)');
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}
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var code = 'string.sub(' + text + ', ' + start + ', ' + end + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_changeCase'] = function(block) {
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// Change capitalization.
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var operator = block.getFieldValue('CASE');
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var text = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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if (operator === 'UPPERCASE') {
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var functionName = 'string.upper';
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} else if (operator === 'LOWERCASE') {
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var functionName = 'string.lower';
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} else if (operator === 'TITLECASE') {
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var functionName = Blockly.Lua.provideFunction_(
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'text_titlecase',
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// There are shorter versions at
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// http://lua-users.org/wiki/SciteTitleCase
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// that do not preserve whitespace.
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(str)',
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' local buf = {}',
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' local inWord = false',
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' for i = 1, #str do',
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' local c = string.sub(str, i, i)',
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' if inWord then',
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' table.insert(buf, string.lower(c))',
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' if string.find(c, "%s") then',
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' inWord = false',
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' end',
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' else',
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' table.insert(buf, string.upper(c))',
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' inWord = true',
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' end',
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' end',
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' return table.concat(buf)',
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'end']);
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}
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var code = functionName + '(' + text + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_trim'] = function(block) {
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// Trim spaces.
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var OPERATORS = {
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LEFT: '^%s*(,-)',
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RIGHT: '(.-)%s*$',
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BOTH: '^%s*(.-)%s*$'
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};
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var operator = OPERATORS[block.getFieldValue('MODE')];
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var text = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var code = 'string.gsub(' + text + ', "' + operator + '", "%1")';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_print'] = function(block) {
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// Print statement.
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var msg = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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return 'print(' + msg + ')\n';
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};
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Blockly.Lua['text_prompt_ext'] = function(block) {
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// Prompt function.
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if (block.getField('TEXT')) {
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// Internal message.
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var msg = Blockly.Lua.quote_(block.getFieldValue('TEXT'));
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} else {
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// External message.
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var msg = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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}
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var functionName = Blockly.Lua.provideFunction_(
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'text_prompt',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(msg)',
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' io.write(msg)',
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' io.flush()',
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' return io.read()',
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'end']);
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var code = functionName + '(' + msg + ')';
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var toNumber = block.getFieldValue('TYPE') === 'NUMBER';
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if (toNumber) {
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code = 'tonumber(' + code + ', 10)';
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}
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_prompt'] = Blockly.Lua['text_prompt_ext'];
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Blockly.Lua['text_count'] = function(block) {
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var text = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var sub = Blockly.Lua.valueToCode(block, 'SUB',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var functionName = Blockly.Lua.provideFunction_(
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'text_count',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_
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+ '(haystack, needle)',
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' if #needle == 0 then',
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' return #haystack + 1',
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' end',
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' local i = 1',
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' local count = 0',
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' while true do',
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' i = string.find(haystack, needle, i, true)',
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' if i == nil then',
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' break',
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' end',
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' count = count + 1',
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' i = i + #needle',
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' end',
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' return count',
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'end',
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]);
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var code = functionName + '(' + text + ', ' + sub + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_replace'] = function(block) {
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var text = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var from = Blockly.Lua.valueToCode(block, 'FROM',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var to = Blockly.Lua.valueToCode(block, 'TO',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var functionName = Blockly.Lua.provideFunction_(
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'text_replace',
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['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_
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+ '(haystack, needle, replacement)',
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' local buf = {}',
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' local i = 1',
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' while i <= #haystack do',
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' if string.sub(haystack, i, i + #needle - 1) == needle then',
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' for j = 1, #replacement do',
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' table.insert(buf, string.sub(replacement, j, j))',
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' end',
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' i = i + #needle',
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' else',
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' table.insert(buf, string.sub(haystack, i, i))',
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' i = i + 1',
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' end',
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' end',
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' return table.concat(buf)',
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'end',
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]);
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var code = functionName + '(' + text + ', ' + from + ', ' + to + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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Blockly.Lua['text_reverse'] = function(block) {
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var text = Blockly.Lua.valueToCode(block, 'TEXT',
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Blockly.Lua.ORDER_NONE) || '\'\'';
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var code = 'string.reverse(' + text + ')';
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return [code, Blockly.Lua.ORDER_HIGH];
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};
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