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blockly/generators/dart/lists.js
ellen.spertus ce63f70b37 Automatic commit Mon Jan 13 03:00:02 PST 2014
2014-01-13 03:00:02 -08:00

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/**
* Visual Blocks Language
*
* Copyright 2012 Google Inc.
* http://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 list blocks.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.Dart.lists');
goog.require('Blockly.Dart');
Blockly.Dart.addReservedWords('Math');
Blockly.Dart.lists_create_empty = function() {
// Create an empty list.
return ['[]', Blockly.Dart.ORDER_ATOMIC];
};
Blockly.Dart.lists_create_with = function() {
// Create a list with any number of elements of any type.
var code = new Array(this.itemCount_);
for (var n = 0; n < this.itemCount_; n++) {
code[n] = Blockly.Dart.valueToCode(this, 'ADD' + n,
Blockly.Dart.ORDER_NONE) || 'null';
}
var code = '[' + code.join(', ') + ']';
return [code, Blockly.Dart.ORDER_ATOMIC];
};
Blockly.Dart.lists_repeat = function() {
// Create a list with one element repeated.
if (!Blockly.Dart.definitions_['lists_repeat']) {
// Function adapted from Closure's goog.array.repeat.
var functionName = Blockly.Dart.variableDB_.getDistinctName('lists_repeat',
Blockly.Generator.NAME_TYPE);
Blockly.Dart.lists_repeat.repeat = functionName;
var func = [];
func.push('List ' + functionName + '(value, n) {');
func.push(' var array = new List(n);');
func.push(' for (int i = 0; i < n; i++) {');
func.push(' array[i] = value;');
func.push(' }');
func.push(' return array;');
func.push('}');
Blockly.Dart.definitions_['lists_repeat'] = func.join('\n');
}
var argument0 = Blockly.Dart.valueToCode(this, 'ITEM',
Blockly.Dart.ORDER_NONE) || 'null';
var argument1 = Blockly.Dart.valueToCode(this, 'NUM',
Blockly.Dart.ORDER_NONE) || '0';
var code = Blockly.Dart.lists_repeat.repeat +
'(' + argument0 + ', ' + argument1 + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart.lists_length = function() {
// List length.
var argument0 = Blockly.Dart.valueToCode(this, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
return [argument0 + '.length', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart.lists_isEmpty = function() {
// Is the list empty?
var argument0 = Blockly.Dart.valueToCode(this, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
return [argument0 + '.isEmpty', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart.lists_indexOf = function() {
// Find an item in the list.
var operator = this.getTitleValue('END') == 'FIRST' ?
'indexOf' : 'lastIndexOf';
var argument0 = Blockly.Dart.valueToCode(this, 'FIND',
Blockly.Dart.ORDER_NONE) || '\'\'';
var argument1 = Blockly.Dart.valueToCode(this, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
var code = argument1 + '.' + operator + '(' + argument0 + ') + 1';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart.lists_getIndex = function() {
// Get element at index.
// Note: Until January 2013 this block did not have MODE or WHERE inputs.
var mode = this.getTitleValue('MODE') || 'GET';
var where = this.getTitleValue('WHERE') || 'FROM_START';
var at = Blockly.Dart.valueToCode(this, 'AT',
Blockly.Dart.ORDER_UNARY_PREFIX) || '1';
var list = Blockly.Dart.valueToCode(this, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
if (where == 'FIRST') {
if (mode == 'GET') {
var code = list + '.first';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE') {
var code = list + '.removeAt(0)';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return list + '.removeAt(0);\n';
}
} else if (where == 'LAST') {
if (mode == 'GET') {
var code = list + '.last';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE') {
var code = list + '.removeLast()';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return list + '.removeLast();\n';
}
} else if (where == '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';
}
if (mode == 'GET') {
var code = list + '[' + at + ']';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE') {
var code = list + '.removeAt(' + at + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return list + '.removeAt(' + at + ');\n';
}
} else if (where == 'FROM_END') {
if (mode == 'GET') {
if (!Blockly.Dart.definitions_['lists_get_from_end']) {
var functionName = Blockly.Dart.variableDB_.getDistinctName(
'lists_get_from_end', Blockly.Generator.NAME_TYPE);
Blockly.Dart.lists_getIndex.lists_get_from_end = functionName;
var func = [];
func.push('dynamic ' + functionName + '(List myList, num x) {');
func.push(' x = myList.length - x;');
func.push(' return myList.removeAt(x);');
func.push('}');
Blockly.Dart.definitions_['lists_get_from_end'] = func.join('\n');
}
code = Blockly.Dart.lists_getIndex.lists_get_from_end +
'(' + list + ', ' + at + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE' || mode == 'REMOVE') {
if (!Blockly.Dart.definitions_['lists_remove_from_end']) {
var functionName = Blockly.Dart.variableDB_.getDistinctName(
'lists_remove_from_end', Blockly.Generator.NAME_TYPE);
Blockly.Dart.lists_getIndex.lists_remove_from_end = functionName;
var func = [];
func.push('dynamic ' + functionName + '(List myList, num x) {');
func.push(' x = myList.length - x;');
func.push(' return myList.removeAt(x);');
func.push('}');
Blockly.Dart.definitions_['lists_remove_from_end'] = func.join('\n');
}
code = Blockly.Dart.lists_getIndex.lists_remove_from_end +
'(' + list + ', ' + at + ')';
if (mode == 'GET_REMOVE') {
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return code + ';\n';
}
}
} else if (where == 'RANDOM') {
if (!Blockly.Dart.definitions_['lists_get_random_item']) {
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
var functionName = Blockly.Dart.variableDB_.getDistinctName(
'lists_get_random_item', Blockly.Generator.NAME_TYPE);
Blockly.Dart.lists_getIndex.random = functionName;
var func = [];
func.push('dynamic ' + functionName + '(List myList, bool remove) {');
func.push(' int x = new Math.Random().nextInt(myList.length);');
func.push(' if (remove) {');
func.push(' return myList.removeAt(x);');
func.push(' } else {');
func.push(' return myList[x];');
func.push(' }');
func.push('}');
Blockly.Dart.definitions_['lists_get_random_item'] = func.join('\n');
}
code = Blockly.Dart.lists_getIndex.random +
'(' + list + ', ' + (mode != 'GET') + ')';
if (mode == 'GET' || mode == 'GET_REMOVE') {
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return code + ';\n';
}
}
throw 'Unhandled combination (lists_getIndex).';
};
Blockly.Dart.lists_setIndex = function() {
// Set element at index.
// Note: Until February 2013 this block did not have MODE or WHERE inputs.
var list = Blockly.Dart.valueToCode(this, 'LIST',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
var mode = this.getTitleValue('MODE') || 'GET';
var where = this.getTitleValue('WHERE') || 'FROM_START';
var at = Blockly.Dart.valueToCode(this, 'AT',
Blockly.Dart.ORDER_ADDITIVE) || '1';
var value = Blockly.Dart.valueToCode(this, 'TO',
Blockly.Dart.ORDER_ASSIGNMENT) || 'null';
// Cache non-trivial values to variables to prevent repeated look-ups.
// Closure, which accesses and modifies 'list'.
function cacheList() {
if (list.match(/^\w+$/)) {
return '';
}
var listVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_list', Blockly.Variables.NAME_TYPE);
var code = 'List ' + listVar + ' = ' + list + ';\n';
list = listVar;
return code;
}
if (where == 'FIRST') {
if (mode == 'SET') {
return list + '[0] = ' + value + ';\n';
} else if (mode == 'INSERT') {
return list + '.insertRange(0, 1, ' + value + ');\n';
}
} else if (where == 'LAST') {
if (mode == 'SET') {
var code = cacheList();
code += list + '[' + list + '.length - 1] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
return list + '.addLast(' + value + ');\n';
}
} else if (where == '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';
}
if (mode == 'SET') {
return list + '[' + at + '] = ' + value + ';\n';
} else if (mode == 'INSERT') {
return list + '.insertRange(' + at + ', 1, ' + value + ');\n';
}
} else if (where == 'FROM_END') {
var code = cacheList();
if (mode == 'SET') {
code += list + '[' + list + '.length - ' + at + '] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.insertRange(' + list + '.length - ' + at + ', 1, ' +
value + ');\n';
return code;
}
} else if (where == 'RANDOM') {
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
var code = cacheList();
var xVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_x', Blockly.Variables.NAME_TYPE);
code += 'int ' + xVar + ' = new Math.Random().nextInt(' + list + '.length);';
if (mode == 'SET') {
code += list + '[' + xVar + '] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.insertRange(' + xVar + ', 1, ' + value + ');\n';
return code;
}
}
throw 'Unhandled combination (lists_setIndex).';
};
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