org.apache.xerces.impl.xpath.regex.REUtil Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xercesImpl Show documentation
Show all versions of xercesImpl Show documentation
Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family.
This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building
parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is
the reference implementation of XNI but other parser components, configurations, and parsers can be written
using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual.
Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema
1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema
Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for
evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation
of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete
implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML
Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that
it does not yet provide an option to enable normalization checking as described in section 2.13 of this
specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly
serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.
The newest version!
/*
* 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.
*/
package org.apache.xerces.impl.xpath.regex;
import java.text.CharacterIterator;
/**
* @xerces.internal
*
* @version $Id: REUtil.java 828015 2009-10-21 13:56:13Z knoaman $
*/
public final class REUtil {
private REUtil() {
}
static final int composeFromSurrogates(int high, int low) {
return 0x10000 + ((high-0xd800)<<10) + low-0xdc00;
}
static final boolean isLowSurrogate(int ch) {
return (ch & 0xfc00) == 0xdc00;
}
static final boolean isHighSurrogate(int ch) {
return (ch & 0xfc00) == 0xd800;
}
static final String decomposeToSurrogates(int ch) {
char[] chs = new char[2];
ch -= 0x10000;
chs[0] = (char)((ch>>10)+0xd800);
chs[1] = (char)((ch&0x3ff)+0xdc00);
return new String(chs);
}
static final String substring(CharacterIterator iterator, int begin, int end) {
char[] src = new char[end-begin];
for (int i = 0; i < src.length; i ++)
src[i] = iterator.setIndex(i+begin);
return new String(src);
}
// ================================================================
static final int getOptionValue(int ch) {
int ret = 0;
switch (ch) {
case 'i':
ret = RegularExpression.IGNORE_CASE;
break;
case 'm':
ret = RegularExpression.MULTIPLE_LINES;
break;
case 's':
ret = RegularExpression.SINGLE_LINE;
break;
case 'x':
ret = RegularExpression.EXTENDED_COMMENT;
break;
case 'u':
ret = RegularExpression.USE_UNICODE_CATEGORY;
break;
case 'w':
ret = RegularExpression.UNICODE_WORD_BOUNDARY;
break;
case 'F':
ret = RegularExpression.PROHIBIT_FIXED_STRING_OPTIMIZATION;
break;
case 'H':
ret = RegularExpression.PROHIBIT_HEAD_CHARACTER_OPTIMIZATION;
break;
case 'X':
ret = RegularExpression.XMLSCHEMA_MODE;
break;
case ',':
ret = RegularExpression.SPECIAL_COMMA;
break;
default:
}
return ret;
}
static final int parseOptions(String opts) throws ParseException {
if (opts == null) return 0;
int options = 0;
for (int i = 0; i < opts.length(); i ++) {
int v = getOptionValue(opts.charAt(i));
if (v == 0)
throw new ParseException("Unknown Option: "+opts.substring(i), -1);
options |= v;
}
return options;
}
static final String createOptionString(int options) {
StringBuffer sb = new StringBuffer(9);
if ((options & RegularExpression.PROHIBIT_FIXED_STRING_OPTIMIZATION) != 0)
sb.append((char)'F');
if ((options & RegularExpression.PROHIBIT_HEAD_CHARACTER_OPTIMIZATION) != 0)
sb.append((char)'H');
if ((options & RegularExpression.XMLSCHEMA_MODE) != 0)
sb.append((char)'X');
if ((options & RegularExpression.IGNORE_CASE) != 0)
sb.append((char)'i');
if ((options & RegularExpression.MULTIPLE_LINES) != 0)
sb.append((char)'m');
if ((options & RegularExpression.SINGLE_LINE) != 0)
sb.append((char)'s');
if ((options & RegularExpression.USE_UNICODE_CATEGORY) != 0)
sb.append((char)'u');
if ((options & RegularExpression.UNICODE_WORD_BOUNDARY) != 0)
sb.append((char)'w');
if ((options & RegularExpression.EXTENDED_COMMENT) != 0)
sb.append((char)'x');
if ((options & RegularExpression.SPECIAL_COMMA) != 0)
sb.append((char)',');
return sb.toString().intern();
}
// ================================================================
static String stripExtendedComment(String regex) {
int len = regex.length();
StringBuffer buffer = new StringBuffer(len);
int offset = 0;
int charClass = 0;
while (offset < len) {
int ch = regex.charAt(offset++);
// Skips a white space.
if (ch == '\t' || ch == '\n' || ch == '\f' || ch == '\r' || ch == ' ') {
// if we are inside a character class, we keep the white space
if (charClass > 0) {
buffer.append((char)ch);
}
continue;
}
if (ch == '#') { // Skips chracters between '#' and a line end.
while (offset < len) {
ch = regex.charAt(offset++);
if (ch == '\r' || ch == '\n')
break;
}
continue;
}
int next; // Strips an escaped white space.
if (ch == '\\' && offset < len) {
if ((next = regex.charAt(offset)) == '#'
|| next == '\t' || next == '\n' || next == '\f'
|| next == '\r' || next == ' ') {
buffer.append((char)next);
offset ++;
} else { // Other escaped character.
buffer.append((char)'\\');
buffer.append((char)next);
offset ++;
}
}
else if (ch == '[') {
charClass++;
buffer.append((char)ch);
if (offset < len) {
next = regex.charAt(offset);
if (next == '[' || next ==']') {
buffer.append((char)next);
offset ++;
}
else if (next == '^' && offset + 1 < len) {
next = regex.charAt(offset + 1);
if (next == '[' || next ==']') {
buffer.append((char)'^');
buffer.append((char)next);
offset += 2;
}
}
}
}
else {
if (charClass > 0 && ch == ']') {
--charClass;
}
buffer.append((char)ch);
}
}
return buffer.toString();
}
// ================================================================
/**
* Sample entry.
* Usage: org.apache.xerces.utils.regex.REUtil <regex> <string>
*/
public static void main(String[] argv) {
String pattern = null;
try {
String options = "";
String target = null;
if( argv.length == 0 ) {
System.out.println( "Error:Usage: java REUtil -i|-m|-s|-u|-w|-X regularExpression String" );
System.exit( 0 );
}
for (int i = 0; i < argv.length; i ++) {
if (argv[i].length() == 0 || argv[i].charAt(0) != '-') {
if (pattern == null)
pattern = argv[i];
else if (target == null)
target = argv[i];
else
System.err.println("Unnecessary: "+argv[i]);
} else if (argv[i].equals("-i")) {
options += "i";
} else if (argv[i].equals("-m")) {
options += "m";
} else if (argv[i].equals("-s")) {
options += "s";
} else if (argv[i].equals("-u")) {
options += "u";
} else if (argv[i].equals("-w")) {
options += "w";
} else if (argv[i].equals("-X")) {
options += "X";
} else {
System.err.println("Unknown option: "+argv[i]);
}
}
RegularExpression reg = new RegularExpression(pattern, options);
System.out.println("RegularExpression: "+reg);
Match match = new Match();
reg.matches(target, match);
for (int i = 0; i < match.getNumberOfGroups(); i ++) {
if (i == 0 ) System.out.print("Matched range for the whole pattern: ");
else System.out.print("["+i+"]: ");
if (match.getBeginning(i) < 0)
System.out.println("-1");
else {
System.out.print(match.getBeginning(i)+", "+match.getEnd(i)+", ");
System.out.println("\""+match.getCapturedText(i)+"\"");
}
}
} catch (ParseException pe) {
if (pattern == null) {
pe.printStackTrace();
} else {
System.err.println("org.apache.xerces.utils.regex.ParseException: "+pe.getMessage());
String indent = " ";
System.err.println(indent+pattern);
int loc = pe.getLocation();
if (loc >= 0) {
System.err.print(indent);
for (int i = 0; i < loc; i ++) System.err.print("-");
System.err.println("^");
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
static final int CACHESIZE = 20;
static final RegularExpression[] regexCache = new RegularExpression[CACHESIZE];
/**
* Creates a RegularExpression instance.
* This method caches created instances.
*
* @see RegularExpression#RegularExpression(java.lang.String, java.lang.String)
*/
public static RegularExpression createRegex(String pattern, String options)
throws ParseException {
RegularExpression re = null;
int intOptions = REUtil.parseOptions(options);
synchronized (REUtil.regexCache) {
int i;
for (i = 0; i < REUtil.CACHESIZE; i ++) {
RegularExpression cached = REUtil.regexCache[i];
if (cached == null) {
i = -1;
break;
}
if (cached.equals(pattern, intOptions)) {
re = cached;
break;
}
}
if (re != null) {
if (i != 0) {
System.arraycopy(REUtil.regexCache, 0, REUtil.regexCache, 1, i);
REUtil.regexCache[0] = re;
}
} else {
re = new RegularExpression(pattern, options);
System.arraycopy(REUtil.regexCache, 0, REUtil.regexCache, 1, REUtil.CACHESIZE-1);
REUtil.regexCache[0] = re;
}
}
return re;
}
/**
*
* @see RegularExpression#matches(java.lang.String)
*/
public static boolean matches(String regex, String target) throws ParseException {
return REUtil.createRegex(regex, null).matches(target);
}
/**
*
* @see RegularExpression#matches(java.lang.String)
*/
public static boolean matches(String regex, String options, String target) throws ParseException {
return REUtil.createRegex(regex, options).matches(target);
}
// ================================================================
/**
*
*/
public static String quoteMeta(String literal) {
int len = literal.length();
StringBuffer buffer = null;
for (int i = 0; i < len; i ++) {
int ch = literal.charAt(i);
if (".*+?{[()|\\^$".indexOf(ch) >= 0) {
if (buffer == null) {
buffer = new StringBuffer(i+(len-i)*2);
if (i > 0) buffer.append(literal.substring(0, i));
}
buffer.append((char)'\\');
buffer.append((char)ch);
} else if (buffer != null)
buffer.append((char)ch);
}
return buffer != null ? buffer.toString() : literal;
}
// ================================================================
static void dumpString(String v) {
for (int i = 0; i < v.length(); i ++) {
System.out.print(Integer.toHexString(v.charAt(i)));
System.out.print(" ");
}
System.out.println();
}
}