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/**
* @license
* Copyright 2014 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Generating Dart for list blocks.
* @author [email protected] (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.Dart.lists');
goog.require('Blockly.Dart');
Blockly.Dart.addReservedWords('Math');
Blockly.Dart['lists_create_empty'] = function(block) {
// Create an empty list.
return ['[]', Blockly.Dart.ORDER_ATOMIC];
};
Blockly.Dart['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.Dart.valueToCode(block, 'ADD' + i,
Blockly.Dart.ORDER_NONE) || 'null';
}
var code = '[' + elements.join(', ') + ']';
return [code, Blockly.Dart.ORDER_ATOMIC];
};
Blockly.Dart['lists_repeat'] = function(block) {
// Create a list with one element repeated.
var element = Blockly.Dart.valueToCode(block, 'ITEM',
Blockly.Dart.ORDER_NONE) || 'null';
var repeatCount = Blockly.Dart.valueToCode(block, 'NUM',
Blockly.Dart.ORDER_NONE) || '0';
var code = 'new List.filled(' + repeatCount + ', ' + element + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_length'] = function(block) {
// String or array length.
var list = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
return [list + '.length', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_isEmpty'] = function(block) {
// Is the string null or array empty?
var list = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
return [list + '.isEmpty', Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_indexOf'] = function(block) {
// Find an item in the list.
var operator = block.getFieldValue('END') == 'FIRST' ?
'indexOf' : 'lastIndexOf';
var item = Blockly.Dart.valueToCode(block, 'FIND',
Blockly.Dart.ORDER_NONE) || '\'\'';
var list = Blockly.Dart.valueToCode(block, 'VALUE',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
var code = list + '.' + operator + '(' + item + ')';
if (block.workspace.options.oneBasedIndex) {
return [code + ' + 1', Blockly.Dart.ORDER_ADDITIVE];
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['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' || where == 'FROM_END') ?
Blockly.Dart.ORDER_NONE : Blockly.Dart.ORDER_UNARY_POSTFIX;
var list = Blockly.Dart.valueToCode(block, 'VALUE', listOrder) || '[]';
// Cache non-trivial values to variables to prevent repeated look-ups.
// Closure, which accesses and modifies 'list'.
function cacheList() {
var listVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_list', Blockly.VARIABLE_CATEGORY_NAME);
var code = 'List ' + listVar + ' = ' + list + ';\n';
list = listVar;
return code;
}
// If `list` would be evaluated more than once (which is the case for
// RANDOM REMOVE and FROM_END) and is non-trivial, make sure to access it
// only once.
if (((where == 'RANDOM' && mode == 'REMOVE') || where == 'FROM_END') &&
!list.match(/^\w+$/)) {
// `list` is an expression, so we may not evaluate it more than once.
if (where == 'RANDOM') {
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
// We can use multiple statements.
var code = cacheList();
var xVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_x', Blockly.VARIABLE_CATEGORY_NAME);
code += 'int ' + xVar + ' = new Math.Random().nextInt(' + list +
'.length);\n';
code += list + '.removeAt(' + xVar + ');\n';
return code;
} else { // where == 'FROM_END'
if (mode == 'REMOVE') {
// We can use multiple statements.
var at = Blockly.Dart.getAdjusted(block, 'AT', 1, false,
Blockly.Dart.ORDER_ADDITIVE);
var code = cacheList();
code += list + '.removeAt(' + list + '.length' + ' - ' + at + ');\n';
return code;
} else if (mode == 'GET') {
var at = Blockly.Dart.getAdjusted(block, 'AT', 1);
// We need to create a procedure to avoid reevaluating values.
var functionName = Blockly.Dart.provideFunction_(
'lists_get_from_end',
['dynamic ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List my_list, num x) {',
' x = my_list.length - x;',
' return my_list[x];',
'}']);
var code = functionName + '(' + list + ', ' + at + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE') {
var at = Blockly.Dart.getAdjusted(block, 'AT', 1);
// We need to create a procedure to avoid reevaluating values.
var functionName = Blockly.Dart.provideFunction_(
'lists_remove_from_end',
['dynamic ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List my_list, num x) {',
' x = my_list.length - x;',
' return my_list.removeAt(x);',
'}']);
var code = functionName + '(' + list + ', ' + at + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
}
}
} else {
// Either `list` is a simple variable, or we only need to refer to `list`
// once.
switch (where) {
case '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';
}
break;
case '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';
}
break;
case 'FROM_START':
var at = Blockly.Dart.getAdjusted(block, 'AT');
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';
}
break;
case 'FROM_END':
var at = Blockly.Dart.getAdjusted(block, 'AT', 1, false,
Blockly.Dart.ORDER_ADDITIVE);
if (mode == 'GET') {
var code = list + '[' + list + '.length - ' + at + ']';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE' || mode == 'REMOVE') {
var code = list + '.removeAt(' + list + '.length - ' + at + ')';
if (mode == 'GET_REMOVE') {
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'REMOVE') {
return code + ';\n';
}
}
break;
case 'RANDOM':
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
if (mode == 'REMOVE') {
// We can use multiple statements.
var xVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_x', Blockly.VARIABLE_CATEGORY_NAME);
var code = 'int ' + xVar + ' = new Math.Random().nextInt(' + list +
'.length);\n';
code += list + '.removeAt(' + xVar + ');\n';
return code;
} else if (mode == 'GET') {
var functionName = Blockly.Dart.provideFunction_(
'lists_get_random_item',
['dynamic ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List my_list) {',
' int x = new Math.Random().nextInt(my_list.length);',
' return my_list[x];',
'}']);
var code = functionName + '(' + list + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
} else if (mode == 'GET_REMOVE') {
var functionName = Blockly.Dart.provideFunction_(
'lists_remove_random_item',
['dynamic ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List my_list) {',
' int x = new Math.Random().nextInt(my_list.length);',
' return my_list.removeAt(x);',
'}']);
var code = functionName + '(' + list + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
}
break;
}
}
throw Error('Unhandled combination (lists_getIndex).');
};
Blockly.Dart['lists_setIndex'] = function(block) {
// Set element at index.
// Note: Until February 2013 this block did not have MODE or WHERE inputs.
var mode = block.getFieldValue('MODE') || 'GET';
var where = block.getFieldValue('WHERE') || 'FROM_START';
var list = Blockly.Dart.valueToCode(block, 'LIST',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
var value = Blockly.Dart.valueToCode(block, '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.VARIABLE_CATEGORY_NAME);
var code = 'List ' + 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 + '.insert(0, ' + 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 + '.add(' + value + ');\n';
}
break;
case 'FROM_START':
var at = Blockly.Dart.getAdjusted(block, 'AT');
if (mode == 'SET') {
return list + '[' + at + '] = ' + value + ';\n';
} else if (mode == 'INSERT') {
return list + '.insert(' + at + ', ' + value + ');\n';
}
break;
case 'FROM_END':
var at = Blockly.Dart.getAdjusted(block, 'AT', 1, false,
Blockly.Dart.ORDER_ADDITIVE);
var code = cacheList();
if (mode == 'SET') {
code += list + '[' + list + '.length - ' + at + '] = ' + value +
';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.insert(' + list + '.length - ' + at + ', ' +
value + ');\n';
return code;
}
break;
case 'RANDOM':
Blockly.Dart.definitions_['import_dart_math'] =
'import \'dart:math\' as Math;';
var code = cacheList();
var xVar = Blockly.Dart.variableDB_.getDistinctName(
'tmp_x', Blockly.VARIABLE_CATEGORY_NAME);
code += 'int ' + xVar +
' = new Math.Random().nextInt(' + list + '.length);\n';
if (mode == 'SET') {
code += list + '[' + xVar + '] = ' + value + ';\n';
return code;
} else if (mode == 'INSERT') {
code += list + '.insert(' + xVar + ', ' + value + ');\n';
return code;
}
break;
}
throw Error('Unhandled combination (lists_setIndex).');
};
Blockly.Dart['lists_getSublist'] = function(block) {
// Get sublist.
var list = Blockly.Dart.valueToCode(block, 'LIST',
Blockly.Dart.ORDER_UNARY_POSTFIX) || '[]';
var where1 = block.getFieldValue('WHERE1');
var where2 = block.getFieldValue('WHERE2');
if (list.match(/^\w+$/) || (where1 != 'FROM_END' && where2 == 'FROM_START')) {
// If the list is a 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.Dart.getAdjusted(block, 'AT1');
break;
case 'FROM_END':
var at1 = Blockly.Dart.getAdjusted(block, 'AT1', 1, false,
Blockly.Dart.ORDER_ADDITIVE);
at1 = list + '.length - ' + at1;
break;
case 'FIRST':
var at1 = '0';
break;
default:
throw Error('Unhandled option (lists_getSublist).');
}
switch (where2) {
case 'FROM_START':
var at2 = Blockly.Dart.getAdjusted(block, 'AT2', 1);
break;
case 'FROM_END':
var at2 = Blockly.Dart.getAdjusted(block, 'AT2', 0, false,
Blockly.Dart.ORDER_ADDITIVE);
at2 = list + '.length - ' + at2;
break;
case 'LAST':
// There is no second index if LAST option is chosen.
break;
default:
throw Error('Unhandled option (lists_getSublist).');
}
if (where2 == 'LAST') {
var code = list + '.sublist(' + at1 + ')';
} else {
var code = list + '.sublist(' + at1 + ', ' + at2 + ')';
}
} else {
var at1 = Blockly.Dart.getAdjusted(block, 'AT1');
var at2 = Blockly.Dart.getAdjusted(block, 'AT2');
var functionName = Blockly.Dart.provideFunction_(
'lists_get_sublist',
['List ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List list, String where1, num at1, String where2, num at2) {',
' int getAt(String where, num at) {',
' if (where == \'FROM_END\') {',
' at = list.length - 1 - at;',
' } else if (where == \'FIRST\') {',
' at = 0;',
' } else if (where == \'LAST\') {',
' at = list.length - 1;',
' } else if (where != \'FROM_START\') {',
' throw \'Unhandled option (lists_getSublist).\';',
' }',
' return at;',
' }',
' at1 = getAt(where1, at1);',
' at2 = getAt(where2, at2) + 1;',
' return list.sublist(at1, at2);',
'}']);
var code = functionName + '(' + list + ', \'' +
where1 + '\', ' + at1 + ', \'' + where2 + '\', ' + at2 + ')';
}
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_sort'] = function(block) {
// Block for sorting a list.
var list = Blockly.Dart.valueToCode(block, 'LIST',
Blockly.Dart.ORDER_NONE) || '[]';
var direction = block.getFieldValue('DIRECTION') === '1' ? 1 : -1;
var type = block.getFieldValue('TYPE');
var sortFunctionName = Blockly.Dart.provideFunction_(
'lists_sort',
['List ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
'(List list, String type, int direction) {',
' var compareFuncs = {',
' "NUMERIC": (a, b) => (direction * a.compareTo(b)).toInt(),',
' "TEXT": (a, b) => direction * ' +
'a.toString().compareTo(b.toString()),',
' "IGNORE_CASE": ',
' (a, b) => direction * ',
' a.toString().toLowerCase().compareTo(b.toString().toLowerCase())',
' };',
' list = new List.from(list);', // Clone the list.
' var compare = compareFuncs[type];',
' list.sort(compare);',
' return list;',
'}']);
return [sortFunctionName + '(' + list + ', ' +
'"' + type + '", ' + direction + ')',
Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_split'] = function(block) {
// Block for splitting text into a list, or joining a list into text.
var input = Blockly.Dart.valueToCode(block, 'INPUT',
Blockly.Dart.ORDER_UNARY_POSTFIX);
var delimiter = Blockly.Dart.valueToCode(block, 'DELIM',
Blockly.Dart.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 Error('Unknown mode: ' + mode);
}
var code = input + '.' + functionName + '(' + delimiter + ')';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};
Blockly.Dart['lists_reverse'] = function(block) {
// Block for reversing a list.
var list = Blockly.Dart.valueToCode(block, 'LIST',
Blockly.Dart.ORDER_NONE) || '[]';
// XXX What should the operator precedence be for a `new`?
var code = 'new List.from(' + list + '.reversed)';
return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
};