269 lines
13 KiB
Java
269 lines
13 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin.utils;
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import android.text.InputType;
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import android.text.TextUtils;
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import com.android.inputmethod.latin.Constants;
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import com.android.inputmethod.latin.WordComposer;
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import java.util.Locale;
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public final class CapsModeUtils {
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private CapsModeUtils() {
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// This utility class is not publicly instantiable.
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}
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/**
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* Apply an auto-caps mode to a string.
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*
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* This intentionally does NOT apply manual caps mode. It only changes the capitalization if
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* the mode is one of the auto-caps modes.
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* @param s The string to capitalize.
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* @param capitalizeMode The mode in which to capitalize.
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* @param locale The locale for capitalizing.
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* @return The capitalized string.
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*/
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public static String applyAutoCapsMode(final String s, final int capitalizeMode,
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final Locale locale) {
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if (WordComposer.CAPS_MODE_AUTO_SHIFT_LOCKED == capitalizeMode) {
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return s.toUpperCase(locale);
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} else if (WordComposer.CAPS_MODE_AUTO_SHIFTED == capitalizeMode) {
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return StringUtils.capitalizeFirstCodePoint(s, locale);
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} else {
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return s;
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}
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}
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/**
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* Return whether a constant represents an auto-caps mode (either auto-shift or auto-shift-lock)
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* @param mode The mode to test for
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* @return true if this represents an auto-caps mode, false otherwise
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*/
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public static boolean isAutoCapsMode(final int mode) {
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return WordComposer.CAPS_MODE_AUTO_SHIFTED == mode
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|| WordComposer.CAPS_MODE_AUTO_SHIFT_LOCKED == mode;
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}
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/**
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* Determine what caps mode should be in effect at the current offset in
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* the text. Only the mode bits set in <var>reqModes</var> will be
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* checked. Note that the caps mode flags here are explicitly defined
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* to match those in {@link InputType}.
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*
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* This code is a straight copy of TextUtils.getCapsMode (modulo namespace and formatting
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* issues). This will change in the future as we simplify the code for our use and fix bugs.
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*
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* @param cs The text that should be checked for caps modes.
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* @param reqModes The modes to be checked: may be any combination of
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* {@link TextUtils#CAP_MODE_CHARACTERS}, {@link TextUtils#CAP_MODE_WORDS}, and
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* {@link TextUtils#CAP_MODE_SENTENCES}.
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* @param locale The locale to consider for capitalization rules
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* @param hasSpaceBefore Whether we should consider there is a space inserted at the end of cs
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*
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* @return Returns the actual capitalization modes that can be in effect
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* at the current position, which is any combination of
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* {@link TextUtils#CAP_MODE_CHARACTERS}, {@link TextUtils#CAP_MODE_WORDS}, and
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* {@link TextUtils#CAP_MODE_SENTENCES}.
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*/
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public static int getCapsMode(final CharSequence cs, final int reqModes, final Locale locale,
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final boolean hasSpaceBefore) {
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// Quick description of what we want to do:
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// CAP_MODE_CHARACTERS is always on.
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// CAP_MODE_WORDS is on if there is some whitespace before the cursor.
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// CAP_MODE_SENTENCES is on if there is some whitespace before the cursor, and the end
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// of a sentence just before that.
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// We ignore opening parentheses and the like just before the cursor for purposes of
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// finding whitespace for WORDS and SENTENCES modes.
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// The end of a sentence ends with a period, question mark or exclamation mark. If it's
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// a period, it also needs not to be an abbreviation, which means it also needs to either
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// be immediately preceded by punctuation, or by a string of only letters with single
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// periods interleaved.
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// Step 1 : check for cap MODE_CHARACTERS. If it's looked for, it's always on.
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if ((reqModes & (TextUtils.CAP_MODE_WORDS | TextUtils.CAP_MODE_SENTENCES)) == 0) {
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// Here we are not looking for MODE_WORDS or MODE_SENTENCES, so since we already
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// evaluated MODE_CHARACTERS, we can return.
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return TextUtils.CAP_MODE_CHARACTERS & reqModes;
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}
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// Step 2 : Skip (ignore at the end of input) any opening punctuation. This includes
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// opening parentheses, brackets, opening quotes, everything that *opens* a span of
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// text in the linguistic sense. In RTL languages, this is still an opening sign, although
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// it may look like a right parenthesis for example. We also include double quote and
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// single quote since they aren't start punctuation in the unicode sense, but should still
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// be skipped for English. TODO: does this depend on the language?
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int i;
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if (hasSpaceBefore) {
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i = cs.length() + 1;
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} else {
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for (i = cs.length(); i > 0; i--) {
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final char c = cs.charAt(i - 1);
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if (c != Constants.CODE_DOUBLE_QUOTE && c != Constants.CODE_SINGLE_QUOTE
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&& Character.getType(c) != Character.START_PUNCTUATION) {
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break;
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}
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}
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}
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// We are now on the character that precedes any starting punctuation, so in the most
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// frequent case this will be whitespace or a letter, although it may occasionally be a
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// start of line, or some symbol.
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// Step 3 : Search for the start of a paragraph. From the starting point computed in step 2,
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// we go back over any space or tab char sitting there. We find the start of a paragraph
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// if the first char that's not a space or tab is a start of line (as in \n, start of text,
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// or some other similar characters).
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int j = i;
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char prevChar = Constants.CODE_SPACE;
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if (hasSpaceBefore) --j;
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while (j > 0) {
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prevChar = cs.charAt(j - 1);
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if (!Character.isSpaceChar(prevChar) && prevChar != Constants.CODE_TAB) break;
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j--;
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}
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if (j <= 0 || Character.isWhitespace(prevChar)) {
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// There are only spacing chars between the start of the paragraph and the cursor,
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// defined as a isWhitespace() char that is neither a isSpaceChar() nor a tab. Both
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// MODE_WORDS and MODE_SENTENCES should be active.
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return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS
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| TextUtils.CAP_MODE_SENTENCES) & reqModes;
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}
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if (i == j) {
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// If we don't have whitespace before index i, it means neither MODE_WORDS
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// nor mode sentences should be on so we can return right away.
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return TextUtils.CAP_MODE_CHARACTERS & reqModes;
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}
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if ((reqModes & TextUtils.CAP_MODE_SENTENCES) == 0) {
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// Here we know we have whitespace before the cursor (if not, we returned in the above
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// if i == j clause), so we need MODE_WORDS to be on. And we don't need to evaluate
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// MODE_SENTENCES so we can return right away.
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return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS) & reqModes;
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}
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// Please note that because of the reqModes & CAP_MODE_SENTENCES test a few lines above,
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// we know that MODE_SENTENCES is being requested.
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// Step 4 : Search for MODE_SENTENCES.
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// English is a special case in that "American typography" rules, which are the most common
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// in English, state that a sentence terminator immediately following a quotation mark
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// should be swapped with it and de-duplicated (included in the quotation mark),
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// e.g. <<Did he say, "let's go home?">>
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// No other language has such a rule as far as I know, instead putting inside the quotation
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// mark as the exact thing quoted and handling the surrounding punctuation independently,
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// e.g. <<Did he say, "let's go home"?>>
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// Hence, specifically for English, we treat this special case here.
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if (Locale.ENGLISH.getLanguage().equals(locale.getLanguage())) {
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for (; j > 0; j--) {
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// Here we look to go over any closing punctuation. This is because in dominant
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// variants of English, the final period is placed within double quotes and maybe
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// other closing punctuation signs. This is generally not true in other languages.
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final char c = cs.charAt(j - 1);
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if (c != Constants.CODE_DOUBLE_QUOTE && c != Constants.CODE_SINGLE_QUOTE
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&& Character.getType(c) != Character.END_PUNCTUATION) {
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break;
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}
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}
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}
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if (j <= 0) return TextUtils.CAP_MODE_CHARACTERS & reqModes;
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char c = cs.charAt(--j);
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// We found the next interesting chunk of text ; next we need to determine if it's the
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// end of a sentence. If we have a question mark or an exclamation mark, it's the end of
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// a sentence. If it's neither, the only remaining case is the period so we get the opposite
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// case out of the way.
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if (c == Constants.CODE_QUESTION_MARK || c == Constants.CODE_EXCLAMATION_MARK) {
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return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_SENTENCES) & reqModes;
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}
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if (c != Constants.CODE_PERIOD || j <= 0) {
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return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS) & reqModes;
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}
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// We found out that we have a period. We need to determine if this is a full stop or
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// otherwise sentence-ending period, or an abbreviation like "e.g.". An abbreviation
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// looks like (\w\.){2,}
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// To find out, we will have a simple state machine with the following states :
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// START, WORD, PERIOD, ABBREVIATION
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// On START : (just before the first period)
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// letter => WORD
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// whitespace => end with no caps (it was a stand-alone period)
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// otherwise => end with caps (several periods/symbols in a row)
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// On WORD : (within the word just before the first period)
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// letter => WORD
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// period => PERIOD
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// otherwise => end with caps (it was a word with a full stop at the end)
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// On PERIOD : (period within a potential abbreviation)
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// letter => LETTER
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// otherwise => end with caps (it was not an abbreviation)
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// On LETTER : (letter within a potential abbreviation)
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// letter => LETTER
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// period => PERIOD
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// otherwise => end with no caps (it was an abbreviation)
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// "Not an abbreviation" in the above chart essentially covers cases like "...yes.". This
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// should capitalize.
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final int START = 0;
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final int WORD = 1;
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final int PERIOD = 2;
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final int LETTER = 3;
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final int caps = (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS
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| TextUtils.CAP_MODE_SENTENCES) & reqModes;
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final int noCaps = (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS) & reqModes;
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int state = START;
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while (j > 0) {
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c = cs.charAt(--j);
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switch (state) {
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case START:
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if (Character.isLetter(c)) {
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state = WORD;
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} else if (Character.isWhitespace(c)) {
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return noCaps;
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} else {
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return caps;
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}
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break;
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case WORD:
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if (Character.isLetter(c)) {
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state = WORD;
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} else if (c == Constants.CODE_PERIOD) {
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state = PERIOD;
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} else {
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return caps;
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}
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break;
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case PERIOD:
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if (Character.isLetter(c)) {
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state = LETTER;
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} else {
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return caps;
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}
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break;
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case LETTER:
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if (Character.isLetter(c)) {
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state = LETTER;
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} else if (c == Constants.CODE_PERIOD) {
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state = PERIOD;
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} else {
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return noCaps;
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}
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}
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}
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// Here we arrived at the start of the line. This should behave exactly like whitespace.
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return (START == state || LETTER == state) ? noCaps : caps;
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}
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}
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