| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:charcode/ascii.dart'; |
| |
| /** |
| * Returns a list of the words from which the given camel case [string] is |
| * composed. |
| * |
| * 'getCamelWords' => ['get', 'Camel', 'Words'] |
| * 'getHTMLText' => ['get', 'HTML', 'Text'] |
| */ |
| List<String> getCamelWords(String string) { |
| if (string == null || string.isEmpty) { |
| return const <String>[]; |
| } |
| List<String> parts = <String>[]; |
| bool wasLowerCase = false; |
| bool wasUpperCase = false; |
| int wordStart = 0; |
| for (int i = 0; i < string.length; i++) { |
| int c = string.codeUnitAt(i); |
| var newLowerCase = isLowerCase(c); |
| var newUpperCase = isUpperCase(c); |
| // myWord |
| // | ^ |
| if (wasLowerCase && newUpperCase) { |
| parts.add(string.substring(wordStart, i)); |
| wordStart = i; |
| } |
| // myHTMLText |
| // | ^ |
| if (wasUpperCase && |
| newUpperCase && |
| i + 1 < string.length && |
| isLowerCase(string.codeUnitAt(i + 1))) { |
| parts.add(string.substring(wordStart, i)); |
| wordStart = i; |
| } |
| wasLowerCase = newLowerCase; |
| wasUpperCase = newUpperCase; |
| } |
| parts.add(string.substring(wordStart)); |
| return parts; |
| } |
| |
| /** |
| * Return `true` if the given [string] is either `null` or empty. |
| */ |
| bool isEmpty(String string) => string == null || string.isEmpty; |
| |
| /** |
| * Return `true` if the given [character] is a lowercase ASCII character. |
| */ |
| bool isLowerCase(int character) => character >= $a && character <= $z; |
| |
| /** |
| * Return `true` if the given [character] is an uppercase ASCII character. |
| */ |
| bool isUpperCase(int character) => character >= $A && character <= $Z; |
| |
| /** |
| * If the given [string] starts with the text to [remove], then return the |
| * portion of the string after the text to remove. Otherwise, return the |
| * original string unmodified. |
| */ |
| String removeStart(String string, String remove) { |
| if (isEmpty(string) || isEmpty(remove)) { |
| return string; |
| } |
| if (string.startsWith(remove)) { |
| return string.substring(remove.length); |
| } |
| return string; |
| } |