491 lines
18 KiB
Java
491 lines
18 KiB
Java
/*
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* Copyright (C) 2010 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.keyboard.internal;
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import android.content.res.Resources;
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import android.text.TextUtils;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.latin.LatinImeLogger;
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import com.android.inputmethod.latin.StringUtils;
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import java.util.ArrayList;
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import java.util.Arrays;
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/**
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* String parser of moreKeys attribute of Key.
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* The string is comma separated texts each of which represents one "more key".
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* - String resource can be embedded into specification @string/name. This is done before parsing
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* comma.
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* Each "more key" specification is one of the following:
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* - A single letter (Letter)
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* - Label optionally followed by keyOutputText or code (keyLabel|keyOutputText).
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* - Icon followed by keyOutputText or a string representation of codes
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* (@icon/icon_name|!code/key_code)
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* Special character, comma ',' backslash '\', and bar '|' can be escaped by '\' character.
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* Note that the character '@' and '\' are also parsed by XML parser and CSV parser as well.
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* See {@link KeyboardIconsSet} about icon_name.
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*/
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public class KeySpecParser {
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private static final boolean DEBUG = LatinImeLogger.sDBG;
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private static final int MAX_STRING_REFERENCE_INDIRECTION = 10;
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// Constants for parsing.
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private static int COMMA = ',';
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private static final char ESCAPE_CHAR = '\\';
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private static final char PREFIX_AT = '@';
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private static final char SUFFIX_SLASH = '/';
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private static final String PREFIX_STRING = PREFIX_AT + "string" + SUFFIX_SLASH;
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private static final char LABEL_END = '|';
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private static final String PREFIX_ICON = PREFIX_AT + "icon" + SUFFIX_SLASH;
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private static final String PREFIX_CODE = "!code/";
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private static final String PREFIX_HEX = "0x";
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private static final String ADDITIONAL_MORE_KEY_MARKER = "%";
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public static class MoreKeySpec {
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public final int mCode;
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public final String mLabel;
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public final String mOutputText;
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public final int mIconId;
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public MoreKeySpec(final String moreKeySpec, final KeyboardCodesSet codesSet) {
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mCode = getCode(moreKeySpec, codesSet);
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mLabel = getLabel(moreKeySpec);
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mOutputText = getOutputText(moreKeySpec);
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mIconId = getIconId(moreKeySpec);
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}
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}
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private KeySpecParser() {
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// Intentional empty constructor for utility class.
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}
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private static boolean hasIcon(String moreKeySpec) {
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if (moreKeySpec.startsWith(PREFIX_ICON)) {
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final int end = indexOfLabelEnd(moreKeySpec, 0);
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if (end > 0) {
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return true;
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}
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throw new KeySpecParserError("outputText or code not specified: " + moreKeySpec);
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}
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return false;
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}
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private static boolean hasCode(String moreKeySpec) {
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final int end = indexOfLabelEnd(moreKeySpec, 0);
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if (end > 0 && end + 1 < moreKeySpec.length()
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&& moreKeySpec.substring(end + 1).startsWith(PREFIX_CODE)) {
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return true;
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}
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return false;
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}
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private static String parseEscape(String text) {
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if (text.indexOf(ESCAPE_CHAR) < 0) {
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return text;
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}
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final int length = text.length();
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final StringBuilder sb = new StringBuilder();
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for (int pos = 0; pos < length; pos++) {
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final char c = text.charAt(pos);
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if (c == ESCAPE_CHAR && pos + 1 < length) {
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// Skip escape char
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pos++;
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sb.append(text.charAt(pos));
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} else {
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sb.append(c);
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}
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}
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return sb.toString();
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}
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private static int indexOfLabelEnd(String moreKeySpec, int start) {
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if (moreKeySpec.indexOf(ESCAPE_CHAR, start) < 0) {
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final int end = moreKeySpec.indexOf(LABEL_END, start);
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if (end == 0) {
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throw new KeySpecParserError(LABEL_END + " at " + start + ": " + moreKeySpec);
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}
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return end;
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}
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final int length = moreKeySpec.length();
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for (int pos = start; pos < length; pos++) {
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final char c = moreKeySpec.charAt(pos);
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if (c == ESCAPE_CHAR && pos + 1 < length) {
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// Skip escape char
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pos++;
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} else if (c == LABEL_END) {
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return pos;
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}
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}
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return -1;
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}
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public static String getLabel(String moreKeySpec) {
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if (hasIcon(moreKeySpec)) {
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return null;
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}
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final int end = indexOfLabelEnd(moreKeySpec, 0);
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final String label = (end > 0) ? parseEscape(moreKeySpec.substring(0, end))
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: parseEscape(moreKeySpec);
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if (TextUtils.isEmpty(label)) {
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throw new KeySpecParserError("Empty label: " + moreKeySpec);
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}
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return label;
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}
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private static String getOutputTextInternal(String moreKeySpec) {
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final int end = indexOfLabelEnd(moreKeySpec, 0);
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if (end <= 0) {
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return null;
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}
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if (indexOfLabelEnd(moreKeySpec, end + 1) >= 0) {
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throw new KeySpecParserError("Multiple " + LABEL_END + ": " + moreKeySpec);
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}
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return parseEscape(moreKeySpec.substring(end + /* LABEL_END */1));
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}
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private static String getOutputText(String moreKeySpec) {
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if (hasCode(moreKeySpec)) {
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return null;
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}
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final String outputText = getOutputTextInternal(moreKeySpec);
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if (outputText != null) {
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if (StringUtils.codePointCount(outputText) == 1) {
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// If output text is one code point, it should be treated as a code.
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// See {@link #getCode(Resources, String)}.
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return null;
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}
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if (!TextUtils.isEmpty(outputText)) {
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return outputText;
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}
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throw new KeySpecParserError("Empty outputText: " + moreKeySpec);
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}
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final String label = getLabel(moreKeySpec);
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if (label == null) {
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throw new KeySpecParserError("Empty label: " + moreKeySpec);
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}
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// Code is automatically generated for one letter label. See {@link getCode()}.
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return (StringUtils.codePointCount(label) == 1) ? null : label;
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}
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private static int getCode(String moreKeySpec, KeyboardCodesSet codesSet) {
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if (hasCode(moreKeySpec)) {
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final int end = indexOfLabelEnd(moreKeySpec, 0);
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if (indexOfLabelEnd(moreKeySpec, end + 1) >= 0) {
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throw new KeySpecParserError("Multiple " + LABEL_END + ": " + moreKeySpec);
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}
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return parseCode(moreKeySpec.substring(end + 1), codesSet, Keyboard.CODE_UNSPECIFIED);
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}
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final String outputText = getOutputTextInternal(moreKeySpec);
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if (outputText != null) {
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// If output text is one code point, it should be treated as a code.
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// See {@link #getOutputText(String)}.
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if (StringUtils.codePointCount(outputText) == 1) {
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return outputText.codePointAt(0);
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}
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return Keyboard.CODE_OUTPUT_TEXT;
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}
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final String label = getLabel(moreKeySpec);
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// Code is automatically generated for one letter label.
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if (StringUtils.codePointCount(label) == 1) {
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return label.codePointAt(0);
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}
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return Keyboard.CODE_OUTPUT_TEXT;
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}
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public static int parseCode(String text, KeyboardCodesSet codesSet, int defCode) {
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if (text == null) return defCode;
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if (text.startsWith(PREFIX_CODE)) {
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return codesSet.getCode(text.substring(PREFIX_CODE.length()));
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} else if (text.startsWith(PREFIX_HEX)) {
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return Integer.parseInt(text.substring(PREFIX_HEX.length()), 16);
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} else {
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return Integer.parseInt(text);
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}
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}
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private static int getIconId(String moreKeySpec) {
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if (hasIcon(moreKeySpec)) {
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final int end = moreKeySpec.indexOf(LABEL_END, PREFIX_ICON.length());
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final String name = moreKeySpec.substring(PREFIX_ICON.length(), end);
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return KeyboardIconsSet.getIconId(name);
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}
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return KeyboardIconsSet.ICON_UNDEFINED;
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}
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private static <T> ArrayList<T> arrayAsList(T[] array, int start, int end) {
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if (array == null) {
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throw new NullPointerException();
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}
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if (start < 0 || start > end || end > array.length) {
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throw new IllegalArgumentException();
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}
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final ArrayList<T> list = new ArrayList<T>(end - start);
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for (int i = start; i < end; i++) {
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list.add(array[i]);
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}
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return list;
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}
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private static final String[] EMPTY_STRING_ARRAY = new String[0];
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private static String[] filterOutEmptyString(String[] array) {
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if (array == null) {
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return EMPTY_STRING_ARRAY;
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}
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ArrayList<String> out = null;
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for (int i = 0; i < array.length; i++) {
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final String entry = array[i];
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if (TextUtils.isEmpty(entry)) {
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if (out == null) {
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out = arrayAsList(array, 0, i);
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}
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} else if (out != null) {
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out.add(entry);
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}
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}
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if (out == null) {
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return array;
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} else {
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return out.toArray(new String[out.size()]);
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}
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}
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public static String[] insertAddtionalMoreKeys(String[] moreKeySpecs,
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String[] additionalMoreKeySpecs) {
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final String[] moreKeys = filterOutEmptyString(moreKeySpecs);
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final String[] additionalMoreKeys = filterOutEmptyString(additionalMoreKeySpecs);
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final int moreKeysCount = moreKeys.length;
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final int additionalCount = additionalMoreKeys.length;
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ArrayList<String> out = null;
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int additionalIndex = 0;
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for (int moreKeyIndex = 0; moreKeyIndex < moreKeysCount; moreKeyIndex++) {
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final String moreKeySpec = moreKeys[moreKeyIndex];
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if (moreKeySpec.equals(ADDITIONAL_MORE_KEY_MARKER)) {
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if (additionalIndex < additionalCount) {
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// Replace '%' marker with additional more key specification.
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final String additionalMoreKey = additionalMoreKeys[additionalIndex];
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if (out != null) {
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out.add(additionalMoreKey);
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} else {
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moreKeys[moreKeyIndex] = additionalMoreKey;
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}
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additionalIndex++;
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} else {
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// Filter out excessive '%' marker.
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if (out == null) {
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out = arrayAsList(moreKeys, 0, moreKeyIndex);
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}
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}
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} else {
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if (out != null) {
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out.add(moreKeySpec);
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}
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}
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}
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if (additionalCount > 0 && additionalIndex == 0) {
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// No '%' marker is found in more keys.
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// Insert all additional more keys to the head of more keys.
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if (DEBUG && out != null) {
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throw new RuntimeException("Internal logic error:"
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+ " moreKeys=" + Arrays.toString(moreKeys)
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+ " additionalMoreKeys=" + Arrays.toString(additionalMoreKeys));
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}
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out = arrayAsList(additionalMoreKeys, additionalIndex, additionalCount);
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for (int i = 0; i < moreKeysCount; i++) {
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out.add(moreKeys[i]);
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}
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} else if (additionalIndex < additionalCount) {
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// The number of '%' markers are less than additional more keys.
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// Append remained additional more keys to the tail of more keys.
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if (DEBUG && out != null) {
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throw new RuntimeException("Internal logic error:"
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+ " moreKeys=" + Arrays.toString(moreKeys)
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+ " additionalMoreKeys=" + Arrays.toString(additionalMoreKeys));
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}
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out = arrayAsList(moreKeys, 0, moreKeysCount);
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for (int i = additionalIndex; i < additionalCount; i++) {
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out.add(additionalMoreKeys[additionalIndex]);
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}
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}
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if (out == null && moreKeysCount > 0) {
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return moreKeys;
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} else if (out != null && out.size() > 0) {
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return out.toArray(new String[out.size()]);
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} else {
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return null;
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}
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}
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@SuppressWarnings("serial")
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public static class KeySpecParserError extends RuntimeException {
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public KeySpecParserError(String message) {
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super(message);
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}
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}
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public static int getResourceId(Resources res, String name, int packageNameResId) {
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String packageName = res.getResourcePackageName(packageNameResId);
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int resId = res.getIdentifier(name, null, packageName);
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if (resId == 0) {
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throw new RuntimeException("Unknown resource: " + name);
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}
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return resId;
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}
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private static String resolveStringResource(String rawText, Resources res,
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int packageNameResId) {
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int level = 0;
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String text = rawText;
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StringBuilder sb;
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do {
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level++;
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if (level >= MAX_STRING_REFERENCE_INDIRECTION) {
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throw new RuntimeException("too many @string/resource indirection: " + text);
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}
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final int size = text.length();
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if (size < PREFIX_STRING.length()) {
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return text;
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}
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sb = null;
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for (int pos = 0; pos < size; pos++) {
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final char c = text.charAt(pos);
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if (c == PREFIX_AT && text.startsWith(PREFIX_STRING, pos)) {
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if (sb == null) {
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sb = new StringBuilder(text.substring(0, pos));
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}
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final int end = searchResourceNameEnd(text, pos + PREFIX_STRING.length());
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final String resName = text.substring(pos + 1, end);
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final int resId = getResourceId(res, resName, packageNameResId);
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sb.append(res.getString(resId));
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pos = end - 1;
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} else if (c == ESCAPE_CHAR) {
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if (sb != null) {
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// Append both escape character and escaped character.
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sb.append(text.substring(pos, Math.min(pos + 2, size)));
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}
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pos++;
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} else if (sb != null) {
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sb.append(c);
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}
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}
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if (sb != null) {
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text = sb.toString();
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}
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} while (sb != null);
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return text;
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}
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private static int searchResourceNameEnd(String text, int start) {
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final int size = text.length();
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for (int pos = start; pos < size; pos++) {
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final char c = text.charAt(pos);
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// String resource name should be consisted of [a-z_0-9].
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if ((c >= 'a' && c <= 'z') || c == '_' || (c >= '0' && c <= '9')) {
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continue;
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}
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return pos;
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}
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return size;
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}
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public static String[] parseCsvString(String rawText, Resources res, int packageNameResId) {
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final String text = resolveStringResource(rawText, res, packageNameResId);
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final int size = text.length();
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if (size == 0) {
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return null;
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}
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if (StringUtils.codePointCount(text) == 1) {
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return text.codePointAt(0) == COMMA ? null : new String[] { text };
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}
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ArrayList<String> list = null;
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int start = 0;
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for (int pos = 0; pos < size; pos++) {
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final char c = text.charAt(pos);
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if (c == COMMA) {
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// Skip empty entry.
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if (pos - start > 0) {
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if (list == null) {
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list = new ArrayList<String>();
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}
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list.add(text.substring(start, pos));
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}
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// Skip comma
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start = pos + 1;
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} else if (c == ESCAPE_CHAR) {
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// Skip escape character and escaped character.
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pos++;
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}
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}
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final String remain = (size - start > 0) ? text.substring(start) : null;
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if (list == null) {
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return remain != null ? new String[] { remain } : null;
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} else {
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if (remain != null) {
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list.add(remain);
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}
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return list.toArray(new String[list.size()]);
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}
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}
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public static int getIntValue(String[] moreKeys, String key, int defaultValue) {
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if (moreKeys == null) {
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return defaultValue;
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}
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boolean foundValue = false;
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int value = defaultValue;
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for (int i = 0; i < moreKeys.length; i++) {
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final String moreKeySpec = moreKeys[i];
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if (moreKeySpec == null || !moreKeySpec.startsWith(key)) {
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continue;
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}
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moreKeys[i] = null;
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try {
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if (!foundValue) {
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value = Integer.parseInt(moreKeySpec.substring(key.length()));
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}
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} catch (NumberFormatException e) {
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throw new RuntimeException(
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"integer should follow after " + key + ": " + moreKeySpec);
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}
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}
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return value;
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}
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public static boolean getBooleanValue(String[] moreKeys, String key) {
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if (moreKeys == null) {
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return false;
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}
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boolean value = false;
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for (int i = 0; i < moreKeys.length; i++) {
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final String moreKeySpec = moreKeys[i];
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if (moreKeySpec == null || !moreKeySpec.equals(key)) {
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continue;
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}
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moreKeys[i] = null;
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value = true;
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}
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return value;
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}
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}
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