net.sf.saxon.regex
Class JDK14RegexTranslator

java.lang.Object
  net.sf.saxon.regex.JDK14RegexTranslator

public class JDK14RegexTranslator

extends java.lang.Object

This class translates XML Schema regex syntax into JDK 1.4 regex syntax. Author: James Clark Modified by Michael Kay (a) to integrate the code into Saxon, and (b) to support XPath additions to the XML Schema regex syntax.

This version of the regular expression translator treats each half of a surrogate pair as a separate character, translating anything in an XPath regex that can match a non-BMP character into a Java regex that matches the two halves of a surrogate pair independently. This approach doesn't work under JDK 1.5, whose regex engine treats a surrogate pair as a single character.

The same translator is currently used for Saxon on .NET 1.1

Constructor Summary

JDK14RegexTranslator()

Method Summary

static void	main(java.lang.String[] args)
void	setIgnoreWhitespace(boolean ignore)
java.lang.String	translate(java.lang.CharSequence regExp, boolean xpath) Translates a regular expression in the syntax of XML Schemas Part 2 into a regular expression in the syntax of java.util.regex.Pattern.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JDK14RegexTranslator

public JDK14RegexTranslator()

Method Detail

setIgnoreWhitespace

public void setIgnoreWhitespace(boolean ignore)

translate

public java.lang.String translate(java.lang.CharSequence regExp,
                                  boolean xpath)
                           throws RegexSyntaxException

Translates a regular expression in the syntax of XML Schemas Part 2 into a regular expression in the syntax of java.util.regex.Pattern. The translation assumes that the string to be matched against the regex uses surrogate pairs correctly. If the string comes from XML content, a conforming XML parser will automatically check this; if the string comes from elsewhere, it may be necessary to check surrogate usage before matching.

Parameters:

regExp - a String containing a regular expression in the syntax of XML Schemas Part 2

xpath - a boolean indicating whether the XPath 2.0 F+O extensions to the schema regex syntax are permitted

Returns:

a String containing a regular expression in the syntax of java.util.regex.Pattern

Throws:

RegexSyntaxException - if regexp is not a regular expression in the syntax of XML Schemas Part 2, or XPath 2.0, as appropriate

See Also:

Pattern, XML Schema Part 2

main

public static void main(java.lang.String[] args)
                 throws RegexSyntaxException

Throws:

RegexSyntaxException