2012-06-08 10:04:09 +00:00
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.util.Log;
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import android.view.KeyEvent;
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import android.view.inputmethod.CompletionInfo;
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import android.view.inputmethod.CorrectionInfo;
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2012-06-08 10:44:38 +00:00
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import android.view.inputmethod.ExtractedText;
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import android.view.inputmethod.ExtractedTextRequest;
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2012-06-08 10:04:09 +00:00
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import android.view.inputmethod.InputConnection;
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2012-06-08 10:44:38 +00:00
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import java.util.regex.Pattern;
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2012-06-08 10:04:09 +00:00
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/**
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* Wrapper for InputConnection to simplify interaction
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*/
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public class RichInputConnection {
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private static final String TAG = RichInputConnection.class.getSimpleName();
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private static final boolean DBG = false;
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2012-06-08 10:44:38 +00:00
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// Provision for a long word pair and a separator
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private static final int LOOKBACK_CHARACTER_NUM = BinaryDictionary.MAX_WORD_LENGTH * 2 + 1;
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private static final Pattern spaceRegex = Pattern.compile("\\s+");
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private static final int INVALID_CURSOR_POSITION = -1;
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2012-06-08 10:04:09 +00:00
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InputConnection mIC;
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int mNestLevel;
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public RichInputConnection() {
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mIC = null;
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mNestLevel = 0;
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}
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public void beginBatchEdit(final InputConnection newInputConnection) {
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if (++mNestLevel == 1) {
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mIC = newInputConnection;
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if (null != mIC) mIC.beginBatchEdit();
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} else {
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if (DBG) {
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throw new RuntimeException("Nest level too deep");
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} else {
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Log.e(TAG, "Nest level too deep : " + mNestLevel);
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}
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}
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}
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public void endBatchEdit() {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (--mNestLevel == 0 && null != mIC) mIC.endBatchEdit();
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}
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public void finishComposingText() {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.finishComposingText();
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}
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public void commitText(final CharSequence text, final int i) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.commitText(text, i);
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}
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public int getCursorCapsMode(final int inputType) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null == mIC) return Constants.TextUtils.CAP_MODE_OFF;
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return mIC.getCursorCapsMode(inputType);
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}
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public CharSequence getTextBeforeCursor(final int i, final int j) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) return mIC.getTextBeforeCursor(i, j);
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return null;
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}
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public CharSequence getTextAfterCursor(final int i, final int j) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) return mIC.getTextAfterCursor(i, j);
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return null;
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}
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public void deleteSurroundingText(final int i, final int j) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.deleteSurroundingText(i, j);
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}
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public void performEditorAction(final int actionId) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.performEditorAction(actionId);
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}
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public void sendKeyEvent(final KeyEvent keyEvent) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.sendKeyEvent(keyEvent);
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}
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public void setComposingText(final CharSequence text, final int i) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.setComposingText(text, i);
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}
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public void setSelection(final int from, final int to) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.setSelection(from, to);
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}
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public void commitCorrection(final CorrectionInfo correctionInfo) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.commitCorrection(correctionInfo);
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}
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public void commitCompletion(final CompletionInfo completionInfo) {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (null != mIC) mIC.commitCompletion(completionInfo);
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}
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2012-06-08 10:44:38 +00:00
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public CharSequence getPreviousWord(final String sentenceSeperators) {
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//TODO: Should fix this. This could be slow!
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if (null == mIC) return null;
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CharSequence prev = mIC.getTextBeforeCursor(LOOKBACK_CHARACTER_NUM, 0);
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return getPreviousWord(prev, sentenceSeperators);
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}
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/**
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* Represents a range of text, relative to the current cursor position.
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*/
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public static class Range {
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/** Characters before selection start */
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public final int mCharsBefore;
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/**
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* Characters after selection start, including one trailing word
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* separator.
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*/
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public final int mCharsAfter;
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/** The actual characters that make up a word */
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public final String mWord;
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public Range(int charsBefore, int charsAfter, String word) {
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if (charsBefore < 0 || charsAfter < 0) {
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throw new IndexOutOfBoundsException();
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}
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this.mCharsBefore = charsBefore;
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this.mCharsAfter = charsAfter;
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this.mWord = word;
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}
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}
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private static boolean isSeparator(int code, String sep) {
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return sep.indexOf(code) != -1;
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}
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// Get the word before the whitespace preceding the non-whitespace preceding the cursor.
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// Also, it won't return words that end in a separator.
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// Example :
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// "abc def|" -> abc
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// "abc def |" -> abc
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// "abc def. |" -> abc
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// "abc def . |" -> def
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// "abc|" -> null
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// "abc |" -> null
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// "abc. def|" -> null
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public static CharSequence getPreviousWord(CharSequence prev, String sentenceSeperators) {
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if (prev == null) return null;
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String[] w = spaceRegex.split(prev);
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// If we can't find two words, or we found an empty word, return null.
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if (w.length < 2 || w[w.length - 2].length() <= 0) return null;
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// If ends in a separator, return null
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char lastChar = w[w.length - 2].charAt(w[w.length - 2].length() - 1);
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if (sentenceSeperators.contains(String.valueOf(lastChar))) return null;
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return w[w.length - 2];
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}
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public CharSequence getThisWord(String sentenceSeperators) {
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if (null == mIC) return null;
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final CharSequence prev = mIC.getTextBeforeCursor(LOOKBACK_CHARACTER_NUM, 0);
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return getThisWord(prev, sentenceSeperators);
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}
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// Get the word immediately before the cursor, even if there is whitespace between it and
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// the cursor - but not if there is punctuation.
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// Example :
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// "abc def|" -> def
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// "abc def |" -> def
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// "abc def. |" -> null
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// "abc def . |" -> null
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public static CharSequence getThisWord(CharSequence prev, String sentenceSeperators) {
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if (prev == null) return null;
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String[] w = spaceRegex.split(prev);
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// No word : return null
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if (w.length < 1 || w[w.length - 1].length() <= 0) return null;
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// If ends in a separator, return null
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char lastChar = w[w.length - 1].charAt(w[w.length - 1].length() - 1);
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if (sentenceSeperators.contains(String.valueOf(lastChar))) return null;
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return w[w.length - 1];
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}
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/**
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* @param separators characters which may separate words
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* @return the word that surrounds the cursor, including up to one trailing
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* separator. For example, if the field contains "he|llo world", where |
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* represents the cursor, then "hello " will be returned.
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*/
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public String getWordAtCursor(String separators) {
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// getWordRangeAtCursor returns null if the connection is null
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Range r = getWordRangeAtCursor(separators, 0);
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return (r == null) ? null : r.mWord;
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}
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private int getCursorPosition() {
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if (null == mIC) return INVALID_CURSOR_POSITION;
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final ExtractedText extracted = mIC.getExtractedText(new ExtractedTextRequest(), 0);
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if (extracted == null) {
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return INVALID_CURSOR_POSITION;
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}
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return extracted.startOffset + extracted.selectionStart;
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}
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/**
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* Returns the text surrounding the cursor.
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*
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* @param sep a string of characters that split words.
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* @param additionalPrecedingWordsCount the number of words before the current word that should
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* be included in the returned range
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* @return a range containing the text surrounding the cursor
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*/
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public Range getWordRangeAtCursor(String sep, int additionalPrecedingWordsCount) {
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if (mIC == null || sep == null) {
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return null;
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}
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CharSequence before = mIC.getTextBeforeCursor(1000, 0);
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CharSequence after = mIC.getTextAfterCursor(1000, 0);
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if (before == null || after == null) {
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return null;
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}
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// Going backward, alternate skipping non-separators and separators until enough words
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// have been read.
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int start = before.length();
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boolean isStoppingAtWhitespace = true; // toggles to indicate what to stop at
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while (true) { // see comments below for why this is guaranteed to halt
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while (start > 0) {
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final int codePoint = Character.codePointBefore(before, start);
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if (isStoppingAtWhitespace == isSeparator(codePoint, sep)) {
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break; // inner loop
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}
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--start;
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if (Character.isSupplementaryCodePoint(codePoint)) {
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--start;
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}
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}
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// isStoppingAtWhitespace is true every other time through the loop,
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// so additionalPrecedingWordsCount is guaranteed to become < 0, which
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// guarantees outer loop termination
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if (isStoppingAtWhitespace && (--additionalPrecedingWordsCount < 0)) {
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break; // outer loop
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}
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isStoppingAtWhitespace = !isStoppingAtWhitespace;
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}
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// Find last word separator after the cursor
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int end = -1;
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while (++end < after.length()) {
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final int codePoint = Character.codePointAt(after, end);
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if (isSeparator(codePoint, sep)) {
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break;
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}
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if (Character.isSupplementaryCodePoint(codePoint)) {
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++end;
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}
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}
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int cursor = getCursorPosition();
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if (start >= 0 && cursor + end <= after.length() + before.length()) {
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String word = before.toString().substring(start, before.length())
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+ after.toString().substring(0, end);
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return new Range(before.length() - start, end, word);
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}
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return null;
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}
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2012-06-08 10:04:09 +00:00
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}
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