mirror of
https://github.com/google/blockly.git
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262 lines
9.2 KiB
JavaScript
262 lines
9.2 KiB
JavaScript
/**
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* @license
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* Visual Blocks Language
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*
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* Copyright 2014 Google Inc.
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* https://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 Dart for text 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.Dart.text');
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goog.require('Blockly.Dart');
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Blockly.Dart.addReservedWords('Html,Math');
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Blockly.Dart['text'] = function(block) {
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// Text value.
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var code = Blockly.Dart.quote_(block.getFieldValue('TEXT'));
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return [code, Blockly.Dart.ORDER_ATOMIC];
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};
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Blockly.Dart['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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var code;
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if (block.itemCount_ == 0) {
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return ['\'\'', Blockly.Dart.ORDER_ATOMIC];
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} else if (block.itemCount_ == 1) {
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var argument0 = Blockly.Dart.valueToCode(block, 'ADD0',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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code = argument0 + '.toString()';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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} else {
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code = new Array(block.itemCount_);
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for (var n = 0; n < block.itemCount_; n++) {
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code[n] = Blockly.Dart.valueToCode(block, 'ADD' + n,
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Blockly.Dart.ORDER_NONE) || '\'\'';
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}
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code = '[' + code.join(',') + '].join()';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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}
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};
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Blockly.Dart['text_append'] = function(block) {
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// Append to a variable in place.
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var varName = Blockly.Dart.variableDB_.getName(block.getFieldValue('VAR'),
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Blockly.Variables.NAME_TYPE);
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var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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return varName + ' = [' + varName + ', ' + argument0 + '].join();\n';
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};
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Blockly.Dart['text_length'] = function(block) {
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// String length.
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var argument0 = Blockly.Dart.valueToCode(block, 'VALUE',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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return [argument0 + '.length', Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['text_isEmpty'] = function(block) {
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// Is the string null?
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var argument0 = Blockly.Dart.valueToCode(block, 'VALUE',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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return [argument0 + '.isEmpty', Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['text_indexOf'] = function(block) {
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// Search the text for a substring.
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var operator = block.getFieldValue('END') == 'FIRST' ?
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'indexOf' : 'lastIndexOf';
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var argument0 = Blockly.Dart.valueToCode(block, 'FIND',
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Blockly.Dart.ORDER_NONE) || '\'\'';
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var argument1 = Blockly.Dart.valueToCode(block, 'VALUE',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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var code = argument1 + '.' + operator + '(' + argument0 + ') + 1';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['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 at = Blockly.Dart.valueToCode(block, 'AT',
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Blockly.Dart.ORDER_NONE) || '1';
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var text = Blockly.Dart.valueToCode(block, 'VALUE',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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switch (where) {
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case 'FIRST':
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var code = text + '[0]';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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case 'FROM_START':
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// Blockly uses one-based indicies.
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if (at.match(/^-?\d+$/)) {
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// If the index is a naked number, decrement it right now.
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at = parseInt(at, 10) - 1;
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} else {
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// If the index is dynamic, decrement it in code.
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at += ' - 1';
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}
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var code = text + '[' + at + ']';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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case 'LAST':
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at = 1;
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// Fall through.
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case 'FROM_END':
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var functionName = Blockly.Dart.provideFunction_(
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'text_get_from_end',
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[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
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'(String text, num x) {',
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' return text[text.length - x];',
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'}']);
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code = functionName + '(' + text + ', ' + at + ')';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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case 'RANDOM':
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Blockly.Dart.definitions_['import_dart_math'] =
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'import \'dart:math\' as Math;';
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var functionName = Blockly.Dart.provideFunction_(
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'text_random_letter',
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[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
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'(String text) {',
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' int x = new Math.Random().nextInt(text.length);',
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' return text[x];',
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'}']);
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code = functionName + '(' + text + ')';
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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}
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throw 'Unhandled option (text_charAt).';
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};
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Blockly.Dart['text_getSubstring'] = function(block) {
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// Get substring.
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var text = Blockly.Dart.valueToCode(block, 'STRING',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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var where1 = block.getFieldValue('WHERE1');
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var where2 = block.getFieldValue('WHERE2');
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var at1 = Blockly.Dart.valueToCode(block, 'AT1',
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Blockly.Dart.ORDER_NONE) || '1';
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var at2 = Blockly.Dart.valueToCode(block, 'AT2',
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Blockly.Dart.ORDER_NONE) || '1';
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if (where1 == 'FIRST' && where2 == 'LAST') {
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var code = text;
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} else {
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var functionName = Blockly.Dart.provideFunction_(
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'text_get_substring',
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[ 'function ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
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'(text, where1, at1, where2, at2) {',
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' function getAt(where, at) {',
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' if (where == \'FROM_START\') {',
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' at--;',
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' } else if (where == \'FROM_END\') {',
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' at = text.length - at;',
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' } else if (where == \'FIRST\') {',
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' at = 0;',
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' } else if (where == \'LAST\') {',
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' at = text.length - 1;',
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' } else {',
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' throw \'Unhandled option (text_getSubstring).\';',
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' }',
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' return at;',
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' }',
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' at1 = getAt(where1, at1);',
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' at2 = getAt(where2, at2) + 1;',
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' return text.substring(at1, at2);',
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'}']);
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var code = functionName + '(' + text + ', \'' +
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where1 + '\', ' + at1 + ', \'' + where2 + '\', ' + at2 + ')';
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}
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['text_changeCase'] = function(block) {
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// Change capitalization.
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var OPERATORS = {
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UPPERCASE: '.toUpperCase()',
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LOWERCASE: '.toLowerCase()',
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TITLECASE: null
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};
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var operator = OPERATORS[block.getFieldValue('CASE')];
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var code;
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if (operator) {
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// Upper and lower case are functions built into Dart.
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var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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code = argument0 + operator;
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} else {
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// Title case is not a native Dart function. Define one.
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var functionName = Blockly.Dart.provideFunction_(
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'text_toTitleCase',
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[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
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'(String str) {',
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' RegExp exp = new RegExp(r\'\\b\');',
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' List<String> list = str.split(exp);',
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' final title = new StringBuffer();',
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' for (String part in list) {',
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' if (part.length > 0) {',
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' title.write(part[0].toUpperCase());',
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' if (part.length > 0) {',
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' title.write(part.substring(1).toLowerCase());',
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' }',
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' }',
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' }',
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' return title.toString();',
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'}']);
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var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
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Blockly.Dart.ORDER_NONE) || '\'\'';
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code = functionName + '(' + argument0 + ')';
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}
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['text_trim'] = function(block) {
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// Trim spaces.
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var OPERATORS = {
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LEFT: '.replaceFirst(new RegExp(r\'^\\s+\'), \'\')',
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RIGHT: '.replaceFirst(new RegExp(r\'\\s+$\'), \'\')',
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BOTH: '.trim()'
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};
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var operator = OPERATORS[block.getFieldValue('MODE')];
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var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
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Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
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return [argument0 + operator, Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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Blockly.Dart['text_print'] = function(block) {
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// Print statement.
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var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
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Blockly.Dart.ORDER_NONE) || '\'\'';
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return 'print(' + argument0 + ');\n';
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};
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Blockly.Dart['text_prompt'] = function(block) {
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// Prompt function.
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Blockly.Dart.definitions_['import_dart_html'] =
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'import \'dart:html\' as Html;';
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var msg = Blockly.Dart.quote_(block.getFieldValue('TEXT'));
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var code = 'Html.window.prompt(' + msg + ', \'\')';
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var toNumber = block.getFieldValue('TYPE') == 'NUMBER';
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if (toNumber) {
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Blockly.Dart.definitions_['import_dart_math'] =
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'import \'dart:math\' as Math;';
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code = 'Math.parseDouble(' + code + ')';
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}
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return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
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};
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