| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * 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. |
| */ |
| package androidx.compose.ui.text.android.selection |
| |
| import androidx.compose.ui.text.android.InternalPlatformTextApi |
| import java.text.BreakIterator |
| import java.util.Locale |
| |
| /** |
| * Helper class to get word boundary for offset. |
| * |
| * Returns the start and end of the word at the given offset. Characters not part of a word, such as |
| * spaces, symbols, and punctuation, have word breaks on both sides. In such cases, this method will |
| * return [offset, offset+1]. |
| * |
| * Word boundaries are defined more precisely in Unicode Standard Annex #29 |
| * http://www.unicode.org/reports/tr29/#Word_Boundaries |
| * |
| * Note: The contents of this file is initially copied from |
| * [Editor.java](https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/widget/Editor.java) |
| * @param locale Locale of the input text. |
| * @param text The input text to be analyzed. |
| * @suppress |
| */ |
| @InternalPlatformTextApi |
| class WordBoundary( |
| locale: Locale, |
| text: CharSequence |
| ) { |
| /** |
| * This word iterator is set with text and used to determine word boundaries when a user is |
| * selecting text. |
| */ |
| private val wordIterator: WordIterator = WordIterator(text, 0, text.length, locale) |
| |
| /** |
| * Get the start of the word which the given offset is in. |
| * |
| * @return the offset of the start of the word. |
| */ |
| fun getWordStart(offset: Int): Int { |
| // FIXME - For this and similar methods we're not doing anything to check if there's |
| // a LocaleSpan in the text, this may be something we should try handling or checking for. |
| var retOffset = wordIterator.prevBoundary(offset) |
| retOffset = |
| if (wordIterator.isOnPunctuation(retOffset)) { |
| // On punctuation boundary or within group of punctuation, find punctuation start. |
| wordIterator.getPunctuationBeginning(offset) |
| } else { |
| // Not on a punctuation boundary, find the word start. |
| wordIterator.getPrevWordBeginningOnTwoWordsBoundary(offset) |
| } |
| return if (retOffset == BreakIterator.DONE) { |
| offset |
| } else retOffset |
| } |
| |
| /** |
| * Get the end of the word which the given offset is in. |
| * |
| * @return the offset of the end of the word. |
| */ |
| fun getWordEnd(offset: Int): Int { |
| var retOffset = wordIterator.nextBoundary(offset) |
| retOffset = |
| if (wordIterator.isAfterPunctuation(retOffset)) { |
| // On punctuation boundary or within group of punctuation, find punctuation end. |
| wordIterator.getPunctuationEnd(offset) |
| } else { // Not on a punctuation boundary, find the word end. |
| wordIterator.getNextWordEndOnTwoWordBoundary(offset) |
| } |
| return if (retOffset == BreakIterator.DONE) { |
| offset |
| } else retOffset |
| } |
| } |