Class JDK15RegexTranslator

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

  • Method Details

    • translate

      public static String translate(CharSequence regExp, int options, int flagbits, List<RegexSyntaxException> warnings) 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
      options - bit-wise option settings
      flagbits - Java bit-wise options settings based on supplied flags
      warnings - a list to contain any warnings generated. If no list is supplied, this indicates that the caller is not interested in knowing about any warnings.
      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
      Description copied from class: RegexTranslator
      If what follows is an Atom, translate it and return true; otherwise return false
      Specified by:
      translateAtom in class RegexTranslator
      Returns:
      true if we found an atom
      Throws:
      RegexSyntaxException - if the regex syntax is incorrect
    • 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 - if the regex is invalid