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blockly/generators/javascript/lists.js

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/**
* @license
* Visual Blocks Language
*
* Copyright 2012 Google Inc.
* https://developers.google.com/blockly/
*
* 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 JavaScript for list blocks.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.JavaScript.lists');
goog.require('Blockly.JavaScript');
Blockly.JavaScript['lists_create_empty'] = function(block) {
// Create an empty list.
return ['[]', Blockly.JavaScript.ORDER_ATOMIC];
};
Blockly.JavaScript['lists_create_with'] = function(block) {
// Create a list with any number of elements of any type.
var elements = new Array(block.itemCount_);
for (var i = 0; i < block.itemCount_; i++) {
elements[i] = Blockly.JavaScript.valueToCode(block, 'ADD' + i,
Blockly.JavaScript.ORDER_COMMA) || 'null';
}
var code = '[' + elements.join(', ') + ']';
return [code, Blockly.JavaScript.ORDER_ATOMIC];
};
Blockly.JavaScript['lists_repeat'] = function(block) {
// Create a list with one element repeated.
var functionName = Blockly.JavaScript.provideFunction_(
'listsRepeat',
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
'(value, n) {',
' var array = [];',
' for (var i = 0; i < n; i++) {',
' array[i] = value;',
' }',
' return array;',
'}']);
var element = Blockly.JavaScript.valueToCode(block, 'ITEM',
Blockly.JavaScript.ORDER_COMMA) || 'null';
var repeatCount = Blockly.JavaScript.valueToCode(block, 'NUM',
Blockly.JavaScript.ORDER_COMMA) || '0';
var code = functionName + '(' + element + ', ' + repeatCount + ')';
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
};
Blockly.JavaScript['lists_length'] = function(block) {
// String or array length.
var list = Blockly.JavaScript.valueToCode(block, 'VALUE',
Blockly.JavaScript.ORDER_MEMBER) || '[]';
return [list + '.length', Blockly.JavaScript.ORDER_MEMBER];
};
Blockly.JavaScript['lists_isEmpty'] = function(block) {
// Is the string null or array empty?
var list = Blockly.JavaScript.valueToCode(block, 'VALUE',
Blockly.JavaScript.ORDER_MEMBER) || '[]';
return ['!' + list + '.length', Blockly.JavaScript.ORDER_LOGICAL_NOT];
};
Blockly.JavaScript['lists_indexOf'] = function(block) {
// Find an item in the list.
var operator = block.getFieldValue('END') == 'FIRST' ?
'indexOf' : 'lastIndexOf';
var item = Blockly.JavaScript.valueToCode(block, 'FIND',
Blockly.JavaScript.ORDER_NONE) || '\'\'';
var list = Blockly.JavaScript.valueToCode(block, 'VALUE',
Blockly.JavaScript.ORDER_MEMBER) || '[]';
var code = list + '.' + operator + '(' + item + ')';
if (block.workspace.options.oneBasedIndex) {
return [code + ' + 1', Blockly.JavaScript.ORDER_ADDITION];
}
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
};
Blockly.JavaScript['lists_getIndex'] = function(block) {
// Get element at index.
// Note: Until January 2013 this block did not have MODE or WHERE inputs.
var mode = block.getFieldValue('MODE') || 'GET';
var where = block.getFieldValue('WHERE') || 'FROM_START';
var listOrder = (where == 'RANDOM') ? Blockly.JavaScript.ORDER_COMMA :
Blockly.JavaScript.ORDER_MEMBER;
var list = Blockly.JavaScript.valueToCode(block, 'VALUE', listOrder) || '[]';
switch (where) {
case ('FIRST'):
if (mode == 'GET') {
var code = list + '[0]';
return [code, Blockly.JavaScript.ORDER_MEMBER];
} else if (mode == 'GET_REMOVE') {
var code = list + '.shift()';
return [code, Blockly.JavaScript.ORDER_MEMBER];
} else if (mode == 'REMOVE') {
return list + '.shift();\n';
}
break;
case ('LAST'):
if (mode == 'GET') {
var code = list + '.slice(-1)[0]';
return [code, Blockly.JavaScript.ORDER_MEMBER];
} else if (mode == 'GET_REMOVE') {
var code = list + '.pop()';
return [code, Blockly.JavaScript.ORDER_MEMBER];
} else if (mode == 'REMOVE') {
return list + '.pop();\n';
}
break;
case ('FROM_START'):
var at = Blockly.JavaScript.getAdjusted(block, 'AT');
if (mode == 'GET') {
var code = list + '[' + at + ']';
return [code, Blockly.JavaScript.ORDER_MEMBER];
} else if (mode == 'GET_REMOVE') {
var code = list + '.splice(' + at + ', 1)[0]';
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
} else if (mode == 'REMOVE') {
return list + '.splice(' + at + ', 1);\n';
}
break;
case ('FROM_END'):
var at = Blockly.JavaScript.getAdjusted(block, 'AT', 1, true);
if (mode == 'GET') {
var code = list + '.slice(' + at + ')[0]';
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
} else if (mode == 'GET_REMOVE') {
var code = list + '.splice(' + at + ', 1)[0]';
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
} else if (mode == 'REMOVE') {
return list + '.splice(' + at + ', 1);';
}
break;
case ('RANDOM'):
var functionName = Blockly.JavaScript.provideFunction_(
'listsGetRandomItem',
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
'(list, remove) {',
' var x = Math.floor(Math.random() * list.length);',
' if (remove) {',
' return list.splice(x, 1)[0];',
' } else {',
' return list[x];',
' }',
'}']);
code = functionName + '(' + list + ', ' + (mode != 'GET') + ')';
if (mode == 'GET' || mode == 'GET_REMOVE') {
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
} else if (mode == 'REMOVE') {
return code + ';\n';
}
break;
}
throw 'Unhandled combination (lists_getIndex).';
};
Blockly.JavaScript['lists_setIndex'] = function(block) {
// Set element at index.
// Note: Until February 2013 this block did not have MODE or WHERE inputs.
var list = Blockly.JavaScript.valueToCode(block, 'LIST',
Blockly.JavaScript.ORDER_MEMBER) || '[]';
var mode = block.getFieldValue('MODE') || 'GET';
var where = block.getFieldValue('WHERE') || 'FROM_START';
var value = Blockly.JavaScript.valueToCode(block, 'TO',
Blockly.JavaScript.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.JavaScript.variableDB_.getDistinctName(
'tmpList', Blockly.Variables.NAME_TYPE);
var code = 'var ' + listVar + ' = ' + list + ';\n';
list = listVar;
return code;
}
switch (where) {
case ('FIRST'):
if (mode == 'SET') {
return list + '[0] = ' + value + ';\n';
} else if (mode == 'INSERT') {
return list + '.unshift(' + value + ');\n';
}
break;
case ('LAST'):
if (mode == 'SET') {
var code = cacheList();
code += list + '[' + list + '.length - 1] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
return list + '.push(' + value + ');\n';
}
break;
case ('FROM_START'):
var at = Blockly.JavaScript.getAdjusted(block, 'AT');
if (mode == 'SET') {
return list + '[' + at + '] = ' + value + ';\n';
} else if (mode == 'INSERT') {
return list + '.splice(' + at + ', 0, ' + value + ');\n';
}
break;
case ('FROM_END'):
var at = Blockly.JavaScript.getAdjusted(block, 'AT', 1, false,
Blockly.JavaScript.ORDER_SUBTRACTION);
var code = cacheList();
if (mode == 'SET') {
code += list + '[' + list + '.length - ' + at + '] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.splice(' + list + '.length - ' + at + ', 0, ' + value +
');\n';
return code;
}
break;
case ('RANDOM'):
var code = cacheList();
var xVar = Blockly.JavaScript.variableDB_.getDistinctName(
'tmpX', Blockly.Variables.NAME_TYPE);
code += 'var ' + xVar + ' = Math.floor(Math.random() * ' + list +
'.length);\n';
if (mode == 'SET') {
code += list + '[' + xVar + '] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.splice(' + xVar + ', 0, ' + value + ');\n';
return code;
}
break;
}
throw 'Unhandled combination (lists_setIndex).';
};
/**
* Returns an expression calculating the index into a list.
* @private
* @param {string} listName Name of the list, used to calculate length.
* @param {string} where The method of indexing, selected by dropdown in Blockly
* @param {string=} opt_at The optional offset when indexing from start/end.
* @return {string} Index expression.
*/
Blockly.JavaScript.lists.getIndex_ = function(listName, where, opt_at) {
if (where == 'FIRST') {
return '0';
} else if (where == 'FROM_END') {
return listName + '.length - 1 - ' + opt_at;
} else if (where == 'LAST') {
return listName + '.length - 1';
} else {
return opt_at;
}
};
Blockly.JavaScript['lists_getSublist'] = function(block) {
// Get sublist.
var list = Blockly.JavaScript.valueToCode(block, 'LIST',
Blockly.JavaScript.ORDER_MEMBER) || '[]';
var where1 = block.getFieldValue('WHERE1');
var where2 = block.getFieldValue('WHERE2');
if (where1 == 'FIRST' && where2 == 'LAST') {
var code = list + '.slice(0)';
} else if (list.match(/^\w+$/) ||
(where1 != 'FROM_END' && where2 == 'FROM_START')) {
// If the list is a variable or doesn't require a call for length, don't
// generate a helper function.
switch (where1) {
case 'FROM_START':
var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1');
break;
case 'FROM_END':
var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1', 1, false,
Blockly.JavaScript.ORDER_SUBTRACTION);
at1 = list + '.length - ' + at1;
break;
case 'FIRST':
var at1 = '0';
break;
default:
throw 'Unhandled option (lists_getSublist).';
}
switch (where2) {
case 'FROM_START':
var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2', 1);
break;
case 'FROM_END':
var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2', 0, false,
Blockly.JavaScript.ORDER_SUBTRACTION);
at2 = list + '.length - ' + at2;
break;
case 'LAST':
var at2 = list + '.length';
break;
default:
throw 'Unhandled option (lists_getSublist).';
}
code = list + '.slice(' + at1 + ', ' + at2 + ')';
} else {
var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1');
var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2');
var getIndex_ = Blockly.JavaScript.lists.getIndex_;
var wherePascalCase = {'FIRST': 'First', 'LAST': 'Last',
'FROM_START': 'FromStart', 'FROM_END': 'FromEnd'};
var functionName = Blockly.JavaScript.provideFunction_(
'subsequence' + wherePascalCase[where1] + wherePascalCase[where2],
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
'(sequence' +
// The value for 'FROM_END' and'FROM_START' depends on `at` so
// we add it as a parameter.
((where1 == 'FROM_END' || where1 == 'FROM_START') ? ', at1' : '') +
((where2 == 'FROM_END' || where2 == 'FROM_START') ? ', at2' : '') +
') {',
' var start = ' + getIndex_('sequence', where1, 'at1') + ';',
' var end = ' + getIndex_('sequence', where2, 'at2') + ' + 1;',
' return sequence.slice(start, end);',
'}']);
var code = functionName + '(' + list +
// The value for 'FROM_END' and 'FROM_START' depends on `at` so we
// pass it.
((where1 == 'FROM_END' || where1 == 'FROM_START') ? ', ' + at1 : '') +
((where2 == 'FROM_END' || where2 == 'FROM_START') ? ', ' + at2 : '') +
')';
}
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
};
Blockly.JavaScript['lists_sort'] = function(block) {
// Block for sorting a list.
var list = Blockly.JavaScript.valueToCode(block, 'LIST',
Blockly.JavaScript.ORDER_FUNCTION_CALL) || '[]';
var direction = block.getFieldValue('DIRECTION') === '1' ? 1 : -1;
var type = block.getFieldValue('TYPE');
var getCompareFunctionName = Blockly.JavaScript.provideFunction_(
'listsGetSortCompare',
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
'(type, direction) {',
' var compareFuncs = {',
' "NUMERIC": function(a, b) {',
' return parseFloat(a) - parseFloat(b); },',
' "TEXT": function(a, b) {',
' return a.toString() > b.toString() ? 1 : -1; },',
' "IGNORE_CASE": function(a, b) {',
' return a.toString().toLowerCase() > ' +
'b.toString().toLowerCase() ? 1 : -1; },',
' };',
' var compare = compareFuncs[type];',
' return function(a, b) { return compare(a, b) * direction; }',
'}']);
return [list + '.slice().sort(' +
getCompareFunctionName + '("' + type + '", ' + direction + '))',
Blockly.JavaScript.ORDER_FUNCTION_CALL];
};
Blockly.JavaScript['lists_split'] = function(block) {
// Block for splitting text into a list, or joining a list into text.
var input = Blockly.JavaScript.valueToCode(block, 'INPUT',
Blockly.JavaScript.ORDER_MEMBER);
var delimiter = Blockly.JavaScript.valueToCode(block, 'DELIM',
Blockly.JavaScript.ORDER_NONE) || '\'\'';
var mode = block.getFieldValue('MODE');
if (mode == 'SPLIT') {
if (!input) {
input = '\'\'';
}
var functionName = 'split';
} else if (mode == 'JOIN') {
if (!input) {
input = '[]';
}
var functionName = 'join';
} else {
throw 'Unknown mode: ' + mode;
}
var code = input + '.' + functionName + '(' + delimiter + ')';
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
};
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