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A processor for parsing, validating, serializing and manipulating XML, written in Java
/*
* 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.util.Locale;
import org.apache.xerces.impl.Constants;
/**
* A regular expression parser for the XML Schema.
*
* @xerces.internal
*
* @author TAMURA Kent <[email protected]>
* @version $Id$
*/
class ParserForXMLSchema extends RegexParser {
private RangeTokenMap xmlMap = null;
private short xmlVersion = Constants.XML_VERSION_1_0;
public ParserForXMLSchema() {
//this.setLocale(Locale.getDefault());
}
public ParserForXMLSchema(Locale locale) {
super(locale);
}
public ParserForXMLSchema(Locale locale, short datatypeXMLVersion) {
super(locale);
xmlVersion = datatypeXMLVersion;
}
Token processCaret() throws ParseException {
this.next();
return Token.createChar('^');
}
Token processDollar() throws ParseException {
this.next();
return Token.createChar('$');
}
Token processLookahead() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processNegativelookahead() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processLookbehind() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processNegativelookbehind() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_A() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_Z() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_z() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_b() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_B() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_lt() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_gt() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processStar(Token tok) throws ParseException {
this.next();
return Token.createClosure(tok);
}
Token processPlus(Token tok) throws ParseException {
// X+ -> XX*
this.next();
return Token.createConcat(tok, Token.createClosure(tok));
}
Token processQuestion(Token tok) throws ParseException {
// X? -> X|
this.next();
Token par = Token.createUnion();
par.addChild(tok);
par.addChild(Token.createEmpty());
return par;
}
boolean checkQuestion(int off) {
return false;
}
Token processParen() throws ParseException {
this.next();
Token tok = Token.createParen(this.parseRegex(), 0);
if (this.read() != T_RPAREN) throw ex("parser.factor.1", this.offset-1);
this.next(); // Skips ')'
return tok;
}
Token processParen2() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processCondition() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processModifiers() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processIndependent() throws ParseException {
throw ex("parser.process.1", this.offset);
}
Token processBacksolidus_c() throws ParseException {
this.next();
return this.getTokenForShorthand('c');
}
Token processBacksolidus_C() throws ParseException {
this.next();
return this.getTokenForShorthand('C');
}
Token processBacksolidus_i() throws ParseException {
this.next();
return this.getTokenForShorthand('i');
}
Token processBacksolidus_I() throws ParseException {
this.next();
return this.getTokenForShorthand('I');
}
Token processBacksolidus_g() throws ParseException {
throw this.ex("parser.process.1", this.offset-2);
}
Token processBacksolidus_X() throws ParseException {
throw ex("parser.process.1", this.offset-2);
}
Token processBackreference() throws ParseException {
throw ex("parser.process.1", this.offset-4);
}
int processCIinCharacterClass(RangeToken tok, int c) {
tok.mergeRanges(this.getTokenForShorthand(c));
return -1;
}
/**
* Parses a character-class-expression, not a character-class-escape.
*
* c-c-expression ::= '[' c-group ']'
* c-group ::= positive-c-group | negative-c-group | c-c-subtraction
* positive-c-group ::= (c-range | c-c-escape)+
* negative-c-group ::= '^' positive-c-group
* c-c-subtraction ::= (positive-c-group | negative-c-group) subtraction
* subtraction ::= '-' c-c-expression
* c-range ::= single-range | from-to-range
* single-range ::= multi-c-escape | category-c-escape | block-c-escape | <any XML char>
* cc-normal-c ::= <any character except [, ], \>
* from-to-range ::= cc-normal-c '-' cc-normal-c
*
* @param useNrage Ignored.
* @return This returns no NrageToken.
*/
protected RangeToken parseCharacterClass(boolean useNrange) throws ParseException {
boolean hyphen11 = isSet(RegularExpression.HYPHEN_IN_SCHEMA_11);
this.setContext(S_INBRACKETS);
this.next(); // '['
boolean nrange = false;
boolean wasDecoded = false; // used to detect if the last - was escaped.
RangeToken base = null;
RangeToken tok;
if (this.read() == T_CHAR && this.chardata == '^') {
nrange = true;
this.next(); // '^'
base = Token.createRange();
base.addRange(0, Token.UTF16_MAX);
tok = Token.createRange();
} else {
tok = Token.createRange();
}
int type;
boolean firstloop = true;
while ((type = this.read()) != T_EOF) { // Don't use 'cotinue' for this loop.
wasDecoded = false;
// single-range | from-to-range | subtraction
if (type == T_CHAR && this.chardata == ']' && !firstloop) {
if (nrange) {
base.subtractRanges(tok);
tok = base;
}
break;
}
int c = this.chardata;
boolean end = false;
if (type == T_BACKSOLIDUS) {
switch (c) {
case 'd': case 'D':
case 'w': case 'W':
case 's': case 'S':
tok.mergeRanges(this.getTokenForShorthand(c));
end = true;
break;
case 'i': case 'I':
case 'c': case 'C':
c = this.processCIinCharacterClass(tok, c);
if (c < 0) end = true;
break;
case 'p':
case 'P':
int pstart = this.offset;
RangeToken tok2 = this.processBacksolidus_pP(c);
if (tok2 == null) {
if (this.isSet(RegularExpression.ALLOW_UNRECOGNIZED_BLOCK_NAME)) {
tok2 = Token.token_all;
}
else {
throw this.ex("parser.atom.5", pstart);
}
}
tok.mergeRanges(tok2);
end = true;
break;
case '-':
c = this.decodeEscaped();
wasDecoded = true;
break;
default:
c = this.decodeEscaped();
} // \ + c
} // backsolidus
else if (type == T_XMLSCHEMA_CC_SUBTRACTION && !firstloop) {
// Subraction
if (nrange) {
base.subtractRanges(tok);
tok = base;
}
RangeToken range2 = this.parseCharacterClass(false);
tok.subtractRanges(range2);
if (this.read() != T_CHAR || this.chardata != ']')
throw this.ex("parser.cc.5", this.offset);
break; // Exit this loop
}
this.next();
if (!end) { // if not shorthands...
if (type == T_CHAR) {
if (c == '[') throw this.ex("parser.cc.6", this.offset-2);
if (c == ']') throw this.ex("parser.cc.7", this.offset-2);
if (!hyphen11 && c == '-' && this.chardata != ']' && !firstloop) throw this.ex("parser.cc.8", this.offset-2); // if regex = '[-]' then invalid
}
if (this.read() != T_CHAR || this.chardata != '-' || !hyphen11 && c == '-' && !wasDecoded && firstloop) { // Here is no '-'.
if (!this.isSet(RegularExpression.IGNORE_CASE) || c > 0xffff) {
tok.addRange(c, c);
}
else {
addCaseInsensitiveChar(tok, c);
}
} else { // Found '-'
// Is this '-' is a from-to token??
this.next(); // Skips '-'
if ((type = this.read()) == T_EOF) throw this.ex("parser.cc.2", this.offset);
// c '-' ']' -> '-' is a single-range.
if(type == T_CHAR && this.chardata == ']' ||
hyphen11 && type == T_XMLSCHEMA_CC_SUBTRACTION) { // if - is at the last position of the group
if (!this.isSet(RegularExpression.IGNORE_CASE) || c > 0xffff) {
tok.addRange(c, c);
}
else {
addCaseInsensitiveChar(tok, c);
}
tok.addRange('-', '-');
}
else if (type == T_XMLSCHEMA_CC_SUBTRACTION) {
throw this.ex("parser.cc.8", this.offset-1);
} else {
if (hyphen11 && c == '-' && !wasDecoded) {
throw this.ex("parser.cc.4", this.offset-2);
}
int rangeend = this.chardata;
if (type == T_CHAR) {
if (rangeend == '[') throw this.ex("parser.cc.6", this.offset-1);
if (rangeend == ']') throw this.ex("parser.cc.7", this.offset-1);
if (rangeend == '-') throw this.ex("parser.cc.8", this.offset-2);
}
else if (type == T_BACKSOLIDUS)
rangeend = this.decodeEscaped();
this.next();
if (c > rangeend) throw this.ex("parser.ope.3", this.offset-1);
if (!this.isSet(RegularExpression.IGNORE_CASE) ||
(c > 0xffff && rangeend > 0xffff)) {
tok.addRange(c, rangeend);
}
else {
addCaseInsensitiveCharRange(tok, c, rangeend);
}
}
}
}
firstloop = false;
}
if (this.read() == T_EOF)
throw this.ex("parser.cc.2", this.offset);
tok.sortRanges();
tok.compactRanges();
//tok.dumpRanges();
this.setContext(S_NORMAL);
this.next(); // Skips ']'
return tok;
}
protected RangeToken parseSetOperations() throws ParseException {
throw this.ex("parser.process.1", this.offset);
}
Token getTokenForShorthand(int ch) {
if (xmlMap == null) {
xmlMap = RangeTokenMapFactory.getXMLTokenMap(xmlVersion);
}
switch (ch) {
case 'd':
return xmlMap.get("xml:isDigit", true);
case 'D':
return xmlMap.get("xml:isDigit", false);
case 'w':
return xmlMap.get("xml:isWord", true);
case 'W':
return xmlMap.get("xml:isWord", false);
case 's':
return xmlMap.get("xml:isSpace", true);
case 'S':
return xmlMap.get("xml:isSpace", false);
case 'c':
return xmlMap.get("xml:isNameChar", true);
case 'C':
return xmlMap.get("xml:isNameChar", false);
case 'i':
return xmlMap.get("xml:isInitialNameChar", true);
case 'I':
return xmlMap.get("xml:isInitialNameChar", false);
default:
throw new RuntimeException("Internal Error: shorthands: \\u"+Integer.toString(ch, 16));
}
}
int decodeEscaped() throws ParseException {
if (this.read() != T_BACKSOLIDUS) throw ex("parser.next.1", this.offset-1);
int c = this.chardata;
switch (c) {
case 'n': c = '\n'; break; // LINE FEED U+000A
case 'r': c = '\r'; break; // CRRIAGE RETURN U+000D
case 't': c = '\t'; break; // HORIZONTAL TABULATION U+0009
case '\\':
case '|':
case '.':
case '^':
case '-':
case '?':
case '*':
case '+':
case '{':
case '}':
case '(':
case ')':
case '[':
case ']':
break; // return actucal char
default:
throw ex("parser.process.1", this.offset-2);
}
return c;
}
}
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