package org.apache.lucene.analysis.icu;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.text.DateFormat;
import java.util.*;
import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.text.UnicodeSetIterator;
import com.ibm.icu.util.VersionInfo;
/** creates a macro to augment jflex's unicode support for > BMP */
public class GenerateHTMLStripCharFilterSupplementaryMacros {
private static final UnicodeSet BMP = new UnicodeSet("[\u0000-\uFFFF]");
private static final String NL = System.getProperty("line.separator");
private static final DateFormat DATE_FORMAT = DateFormat.getDateTimeInstance
(DateFormat.FULL, DateFormat.FULL, Locale.ROOT);
static {
DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
}
private static final String APACHE_LICENSE
= "/*" + NL
+ " * Copyright 2010 The Apache Software Foundation." + NL
+ " *" + NL
+ " * Licensed under the Apache License, Version 2.0 (the \"License\");" + NL
+ " * you may not use this file except in compliance with the License." + NL
+ " * You may obtain a copy of the License at" + NL
+ " *" + NL
+ " * http://www.apache.org/licenses/LICENSE-2.0" + NL
+ " *" + NL
+ " * Unless required by applicable law or agreed to in writing, software" + NL
+ " * distributed under the License is distributed on an \"AS IS\" BASIS," + NL
+ " * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied." + NL
+ " * See the License for the specific language governing permissions and" + NL
+ " * limitations under the License." + NL
+ " */" + NL + NL;
public static void main(String args[]) {
outputHeader();
outputMacro("ID_Start_Supp", "[:ID_Start:]");
outputMacro("ID_Continue_Supp", "[:ID_Continue:]");
}
static void outputHeader() {
System.out.print(APACHE_LICENSE);
System.out.println("// Generated using ICU4J " + VersionInfo.ICU_VERSION.toString());
System.out.println("// by " + GenerateHTMLStripCharFilterSupplementaryMacros.class.getName());
System.out.print(NL + NL);
}
// we have to carefully output the possibilities as compact utf-16
// range expressions, or jflex will OOM!
static void outputMacro(String name, String pattern) {
UnicodeSet set = new UnicodeSet(pattern);
set.removeAll(BMP);
System.out.println(name + " = (");
// if the set is empty, we have to do this or jflex will barf
if (set.isEmpty()) {
System.out.println("\t []");
}
HashMap<Character,UnicodeSet> utf16ByLead = new HashMap<Character,UnicodeSet>();
for (UnicodeSetIterator it = new UnicodeSetIterator(set); it.next();) {
char utf16[] = Character.toChars(it.codepoint);
UnicodeSet trails = utf16ByLead.get(utf16[0]);
if (trails == null) {
trails = new UnicodeSet();
utf16ByLead.put(utf16[0], trails);
}
trails.add(utf16[1]);
}
Map<String,UnicodeSet> utf16ByTrail = new HashMap<String,UnicodeSet>();
for (Map.Entry<Character,UnicodeSet> entry : utf16ByLead.entrySet()) {
String trail = entry.getValue().getRegexEquivalent();
UnicodeSet leads = utf16ByTrail.get(trail);
if (leads == null) {
leads = new UnicodeSet();
utf16ByTrail.put(trail, leads);
}
leads.add(entry.getKey());
}
boolean isFirst = true;
for (Map.Entry<String,UnicodeSet> entry : utf16ByTrail.entrySet()) {
System.out.print( isFirst ? "\t " : "\t| ");
isFirst = false;
System.out.println(entry.getValue().getRegexEquivalent() + entry.getKey());
}
System.out.println(")");
}
}