/* * Copyright (C) 2013 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 com.android.inputmethod.keyboard.internal; import com.android.inputmethod.latin.common.Constants; import com.android.inputmethod.latin.common.StringUtils; import android.text.TextUtils; /** * The string parser of codesArray specification for . The attribute codesArray is an * array of string. * Each element of the array defines a key label by specifying a code point as a hexadecimal string. * A key label may consist of multiple code points separated by comma. * Each element of the array optionally can have an output text definition after vertical bar * marker. An output text may consist of multiple code points separated by comma. * The format of the codesArray element should be: *
 *   label1[,label2]*(|outputText1[,outputText2]*(|minSupportSdkVersion)?)?
 * 
*/ // TODO: Write unit tests for this class. public final class CodesArrayParser { // Constants for parsing. private static final char COMMA = Constants.CODE_COMMA; private static final String COMMA_REGEX = StringUtils.newSingleCodePointString(COMMA); private static final String VERTICAL_BAR_REGEX = // "\\|" new String(new char[] { Constants.CODE_BACKSLASH, Constants.CODE_VERTICAL_BAR }); private static final int BASE_HEX = 16; private CodesArrayParser() { // This utility class is not publicly instantiable. } private static String getLabelSpec(final String codesArraySpec) { final String[] strs = codesArraySpec.split(VERTICAL_BAR_REGEX, -1); if (strs.length <= 1) { return codesArraySpec; } return strs[0]; } public static String parseLabel(final String codesArraySpec) { final String labelSpec = getLabelSpec(codesArraySpec); final StringBuilder sb = new StringBuilder(); for (final String codeInHex : labelSpec.split(COMMA_REGEX)) { final int codePoint = Integer.parseInt(codeInHex, BASE_HEX); sb.appendCodePoint(codePoint); } return sb.toString(); } private static String getCodeSpec(final String codesArraySpec) { final String[] strs = codesArraySpec.split(VERTICAL_BAR_REGEX, -1); if (strs.length <= 1) { return codesArraySpec; } return TextUtils.isEmpty(strs[1]) ? strs[0] : strs[1]; } public static int getMinSupportSdkVersion(final String codesArraySpec) { final String[] strs = codesArraySpec.split(VERTICAL_BAR_REGEX, -1); if (strs.length <= 2) { return 0; } try { return Integer.parseInt(strs[2]); } catch (NumberFormatException e) { return 0; } } public static int parseCode(final String codesArraySpec) { final String codeSpec = getCodeSpec(codesArraySpec); if (codeSpec.indexOf(COMMA) < 0) { return Integer.parseInt(codeSpec, BASE_HEX); } return Constants.CODE_OUTPUT_TEXT; } public static String parseOutputText(final String codesArraySpec) { final String codeSpec = getCodeSpec(codesArraySpec); if (codeSpec.indexOf(COMMA) < 0) { return null; } final StringBuilder sb = new StringBuilder(); for (final String codeInHex : codeSpec.split(COMMA_REGEX)) { final int codePoint = Integer.parseInt(codeInHex, BASE_HEX); sb.appendCodePoint(codePoint); } return sb.toString(); } }