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/*
* 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.Constants;
/**
* The string parser of codesArray specification for <GridRows />. 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:
* <pre>
* codePointInHex[,codePoint2InHex]*(|outputTextCodePointInHex[,outputTextCodePoint2InHex]*)?
* </pre>
*/
// TODO: Write unit tests for this class.
public final class CodesArrayParser {
// Constants for parsing.
private static final char COMMA = ',';
private static final char VERTICAL_BAR = '|';
private static final String COMMA_STRING = ",";
private static final int BASE_HEX = 16;
private CodesArrayParser() {
// This utility class is not publicly instantiable.
}
private static String getLabelSpec(final String codesArraySpec) {
final int pos = codesArraySpec.indexOf(VERTICAL_BAR);
return (pos < 0) ? codesArraySpec : codesArraySpec.substring(0, pos);
}
public static String parseLabel(final String codesArraySpec) {
final String labelSpec = getLabelSpec(codesArraySpec);
final StringBuilder sb = new StringBuilder();
for (final String codeInHex : labelSpec.split(COMMA_STRING)) {
final int codePoint = Integer.parseInt(codeInHex, BASE_HEX);
sb.appendCodePoint(codePoint);
}
return sb.toString();
}
private static String getCodeSpec(final String codesArraySpec) {
final int pos = codesArraySpec.indexOf(VERTICAL_BAR);
return (pos < 0) ? codesArraySpec : codesArraySpec.substring(pos + 1);
}
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_STRING)) {
final int codePoint = Integer.parseInt(codeInHex, BASE_HEX);
sb.appendCodePoint(codePoint);
}
return sb.toString();
}
}
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