Class JDK15RegexTranslator

java.lang.Object
net.sf.saxon.regex.RegexTranslator
net.sf.saxon.java.JDK15RegexTranslator

public class JDK15RegexTranslator extends RegexTranslator
This class translates XML Schema regex syntax into JDK 1.5 regex syntax. This differs from the JDK 1.4 translator because JDK 1.5 handles non-BMP characters (wide characters) in places where JDK 1.4 does not, for example in a range such as [X-Y]. This enables much of the code from the 1.4 translator to be removed. Author: James Clark, Thai Open Source Software Center Ltd. See statement at end of file. 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 also removes most of the complexities of handling non-BMP characters, since JDK 1.5 handles these natively.
  • Field Details

    • categoryCharClasses

      public static final net.sf.saxon.java.JDK15RegexTranslator.CharClass[] categoryCharClasses
      Translates XML Schema and XPath regexes into java.util.regex regexes.
      See Also:
    • subCategoryCharClasses

      public static final net.sf.saxon.java.JDK15RegexTranslator.CharClass[] subCategoryCharClasses
    • specialBlockCharClasses

      public static final net.sf.saxon.java.JDK15RegexTranslator.CharClass[] specialBlockCharClasses
      CharClass for each block name in specialBlockNames.
  • Method Details

    • translate

      public static String translate(CharSequence regExp, int xmlVersion, boolean xpath, boolean ignoreWhitespace, boolean caseBlind) 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:
      xmlVersion - set to Configuration.XML10 for XML 1.0 or Configuration.XML11 for XML 1.1
      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
      ignoreWhitespace - true if whitespace is to be ignored ('x' flag)
      caseBlind - true if case is to be ignored ('i' flag)
      Returns:
      a JDK 1.5 regular expression
      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:
    • translateAtom

      protected boolean translateAtom() throws RegexSyntaxException
      Specified by:
      translateAtom in class RegexTranslator
      Throws:
      RegexSyntaxException
    • main

      public static void main(String[] args) throws RegexSyntaxException
      Main method for testing. Outputs to System.err the Java translation of a supplied regular expression
      Parameters:
      args - command line arguments arg[0] a regular expression arg[1] = xpath to invoke the XPath rules
      Throws:
      RegexSyntaxException