generators/dart/text.js
/**
* @license
* Visual Blocks Language
*
* Copyright 2014 Google Inc.
* https://blockly.googlecode.com/
*
* 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 Dart for text blocks.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.Dart.text');
goog.require('Blockly.Dart');
Blockly.Dart.addReservedWords('Html,Math');
Blockly.Dart['text'] = function(block) {
// Text value.
var code = Blockly.Dart.quote_(block.getFieldValue('TEXT'));
return [code, Blockly.Dart.ORDER_ATOMIC];
};
Blockly.Dart['text_join'] = function(block) {
// Create a string made up of any number of elements of any type.
var code;
if (block.itemCount_ == 0) {
return ['\'\'', Blockly.Dart.ORDER_ATOMIC];
} else if (block.itemCount_ == 1) {
var argument0 = Blockly.Dart.valueToCode(block, 'ADD0',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
code = argument0 + '.toString()';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else {
code = new Array(block.itemCount_);
for (var n = 0; n < block.itemCount_; n++) {
code[n] = Blockly.Dart.valueToCode(block, 'ADD' + n,
Blockly.Dart.ORDER_NONE) || '\'\'';
}
code = '[' + code.join(',') + '].join()';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
}
};
Blockly.Dart['text_append'] = function(block) {
// Append to a variable in place.
var varName = Blockly.Dart.variableDB_.getName(block.getFieldValue('VAR'),
Blockly.Variables.NAME_TYPE);
var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
return varName + ' = [' + varName + ', ' + argument0 + '].join();\n';
};
Blockly.Dart['text_length'] = function(block) {
// String length.
var argument0 = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
return [argument0 + '.length', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_isEmpty'] = function(block) {
// Is the string null?
var argument0 = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
return [argument0 + '.isEmpty', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_indexOf'] = function(block) {
// Search the text for a substring.
var operator = block.getFieldValue('END') == 'FIRST' ?
'indexOf' : 'lastIndexOf';
var argument0 = Blockly.Dart.valueToCode(block, 'FIND',
Blockly.Dart.ORDER_NONE) || '\'\'';
var argument1 = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
var code = argument1 + '.' + operator + '(' + argument0 + ') + 1';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_charAt'] = function(block) {
// Get letter at index.
// Note: Until January 2013 this block did not have the WHERE input.
var where = block.getFieldValue('WHERE') || 'FROM_START';
var at = Blockly.Dart.valueToCode(block, 'AT',
Blockly.Dart.ORDER_NONE) || '1';
var text = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
switch (where) {
case 'FIRST':
var code = text + '[0]';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
case 'FROM_START':
// Blockly uses one-based indicies.
if (at.match(/^-?\d+$/)) {
// If the index is a naked number, decrement it right now.
at = parseInt(at, 10) - 1;
} else {
// If the index is dynamic, decrement it in code.
at += ' - 1';
}
var code = text + '[' + at + ']';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
case 'LAST':
at = 1;
// Fall through.
case 'FROM_END':
var functionName = Blockly.Dart.provideFunction_(
'text_get_from_end',
[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(String text, num x) {',
' return text[text.length - x];',
'}']);
code = functionName + '(' + text + ', ' + at + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
case 'RANDOM':
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
var functionName = Blockly.Dart.provideFunction_(
'text_random_letter',
[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(String text) {',
' int x = new Math.Random().nextInt(text.length);',
' return text[x];',
'}']);
code = functionName + '(' + text + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
}
throw 'Unhandled option (text_charAt).';
};
Blockly.Dart['text_getSubstring'] = function(block) {
// Get substring.
var text = Blockly.Dart.valueToCode(block, 'STRING',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
var where1 = block.getFieldValue('WHERE1');
var where2 = block.getFieldValue('WHERE2');
var at1 = Blockly.Dart.valueToCode(block, 'AT1',
Blockly.Dart.ORDER_NONE) || '1';
var at2 = Blockly.Dart.valueToCode(block, 'AT2',
Blockly.Dart.ORDER_NONE) || '1';
if (where1 == 'FIRST' && where2 == 'LAST') {
var code = text;
} else {
var functionName = Blockly.Dart.provideFunction_(
'text_get_substring',
[ 'function ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(text, where1, at1, where2, at2) {',
' function getAt(where, at) {',
' if (where == \'FROM_START\') {',
' at--;',
' } else if (where == \'FROM_END\') {',
' at = text.length - at;',
' } else if (where == \'FIRST\') {',
' at = 0;',
' } else if (where == \'LAST\') {',
' at = text.length - 1;',
' } else {',
' throw \'Unhandled option (text_getSubstring).\';',
' }',
' return at;',
' }',
' at1 = getAt(where1, at1);',
' at2 = getAt(where2, at2) + 1;',
' return text.substring(at1, at2);',
'}']);
var code = functionName + '(' + text + ', \'' +
where1 + '\', ' + at1 + ', \'' + where2 + '\', ' + at2 + ')';
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_changeCase'] = function(block) {
// Change capitalization.
var OPERATORS = {
'UPPERCASE': '.toUpperCase()',
'LOWERCASE': '.toLowerCase()',
'TITLECASE': null
};
var operator = OPERATORS[block.getFieldValue('CASE')];
var code;
if (operator) {
// Upper and lower case are functions built into Dart.
var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
code = argument0 + operator;
} else {
// Title case is not a native Dart function. Define one.
var functionName = Blockly.Dart.provideFunction_(
'text_toTitleCase',
[ 'String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(String str) {',
' RegExp exp = new RegExp(r\'\\b\');',
' List<String> list = str.split(exp);',
' final title = new StringBuffer();',
' for (String part in list) {',
' if (part.length > 0) {',
' title.write(part[0].toUpperCase());',
' if (part.length > 0) {',
' title.write(part.substring(1).toLowerCase());',
' }',
' }',
' }',
' return title.toString();',
'}']);
var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_NONE) || '\'\'';
code = functionName + '(' + argument0 + ')';
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_trim'] = function(block) {
// Trim spaces.
var OPERATORS = {
'LEFT': '.replaceFirst(new RegExp(r\'^\\s+\'), \'\')',
'RIGHT': '.replaceFirst(new RegExp(r\'\\s+$\'), \'\')',
'BOTH': '.trim()'
};
var operator = OPERATORS[block.getFieldValue('MODE')];
var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
return [argument0 + operator, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_print'] = function(block) {
// Print statement.
var argument0 = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_NONE) || '\'\'';
return 'print(' + argument0 + ');\n';
};
Blockly.Dart['text_prompt'] = function(block) {
// Prompt function (internal message).
Blockly.Dart.definitions_['import_dart_html'] =
'import \'dart:html\' as Html;';
var msg = Blockly.Dart.quote_(block.getFieldValue('TEXT'));
var code = 'Html.window.prompt(' + msg + ', \'\')';
var toNumber = block.getFieldValue('TYPE') == 'NUMBER';
if (toNumber) {
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
code = 'Math.parseDouble(' + code + ')';
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['text_prompt_ext'] = function(block) {
// Prompt function (external message).
Blockly.Dart.definitions_['import_dart_html'] =
'import \'dart:html\' as Html;';
var msg = Blockly.Dart.valueToCode(block, 'TEXT',
Blockly.Dart.ORDER_NONE) || '\'\'';
var code = 'Html.window.prompt(' + msg + ', \'\')';
var toNumber = block.getFieldValue('TYPE') == 'NUMBER';
if (toNumber) {
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
code = 'Math.parseDouble(' + code + ')';
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};