Examples of com.google.opengse.parser.Chset

com.google.opengse.parser.Chset
The {@code Chset} (character set) parser matches the current characterin the parse buffer against an arbitrary character set. The character set is represented as a sorted array of ranges for which a match should be successful. Matching takes O(log nranges) time. There are predefined character sets for matching any character ( {@code ANYCHAR}), no characters ( {@code NOTHING}) and some standard 7-bit ASCII ranges ( {@code ALNUM}, {@code ALPHA}, {@code DIGIT}, {@code XDIGIT}, {@code LOWER}, {@code UPPER}, {@code WHITESPACE}), and {@code ASCII}. Note that the character set parser only matches a single character of the parse buffer. The {@code Sequence} or }Repeat} parsers needto be used to match more than one character. The following matches vowels and digits:
```
    {@code Parser p = new Chset("uoiea0-9"); p.parse("a") -> matches "a" p.parse("3") -> matches "3" p.parse("b") -> no match} 
```
@see Parser @author Peter Mattis

    }
  }




  static Parser<RequestContext> getParser() {
    Chset wsp = new Chset(" \t\r\n");


    // recognize standard methods
    Parser<RequestContext> method = null;
    for (String methodName : STANDARD_METHODS) {
      Parser<RequestContext> p = new Strcaselit(methodName).action(
          new ParserFactory.MethodAction(methodName));
      if (method == null) {
        method = p;
      } else {
        method = Parser.alternative(method, p);
      }
    }


    // support nonstandard methods too
    method = Parser.alternative(
        method,
        Chset.ALPHA.plus().action(new ParserFactory.MethodAction()));


    Parser<RequestContext> uri
        = Chset.not(wsp).plus().action(new ParserFactory.UriAction());


    Parser<RequestContext> version =
      Parser.sequence(new Strcaselit("http/"),
                      Chset.DIGIT.plus().action(new MajorVersionAction()));
    version = Parser.sequence(version, new Chset('.'));
    version = Parser.sequence(version,
      Chset.DIGIT.plus().action(new MinorVersionAction()));


    Parser<RequestContext> reqline = Parser.sequence(method, wsp.plus());
    reqline = Parser.sequence(reqline, uri);
    reqline = Parser.sequence(reqline, wsp.plus());
    reqline = Parser.sequence(reqline, version);


    return reqline;
  }

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   * @param text a Chset representing a character in a quoted pair.
   * @param qtext a Chset representing a character that need not be quoted.
   */
  static Parser<MimeContentHeader> createParameterParser(
      Chset text, Chset qtext) {
    Chset special = new Chset(TSPECIAL_CHARS);
    Chset token = Chset.difference(Chset.difference(Chset.ANYCHAR,
                                                    Chset.WHITESPACE),
                                   special);


    // TODO(spencer): handling of quoted pairs is not correct in this parser.
    // They are simply left as \CHAR. Changing this now, however, would cause
    // existing servers to get different (possibly incompatible) inputs.
    // See ChunkHeader.java for a correct implementation.
    Parser<MimeContentHeader> quotedPair =
        Parser.sequence(new Chset('\\'), text);
    Parser<MimeContentHeader> quotedString =
        Parser.alternative(qtext, quotedPair);
    quotedString = quotedString.star().action(new ParamValueAction());
    quotedString = Parser.sequence(new Chset('"'), quotedString);
    quotedString = Parser.sequence(quotedString, new Chset('"'));


    Parser<MimeContentHeader> name =
        token.plus().action(new ParamNameAction());
    Parser<MimeContentHeader> value =
      token.plus().action(new ParamValueAction());
    value = Parser.alternative(value, quotedString);


    Parser<Object> wsp = Chset.WHITESPACE.star();
    Parser<MimeContentHeader> parameters =
      Parser.sequence(wsp, new Chset(';'));
    parameters = Parser.sequence(parameters, wsp);
    parameters = Parser.sequence(parameters, name);
    parameters = Parser.sequence(parameters, wsp);
    parameters = Parser.sequence(parameters, new Chset('='));
    parameters = Parser.sequence(parameters, wsp);
    parameters = Parser.sequence(parameters, value);
    return parameters.star();
  }

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Related Classes of com.google.opengse.parser.Chset

com.google.opengse.core.ParserFactory

com.google.opengse.httputil.MimeContentHeader

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