pobs.parser
Class PExcept

java.lang.Object
  pobs.PParser
      pobs.parser.PExcept

All Implemented Interfaces:

PObject

public class PExcept

extends PParser

Matches if the parsed input matches the left-hand parser and not matches the right-hand parser. This parser will also return a succesfull match if the right-hand parser could not match as much of the input as the left-hand parser. BNF: this := left - right

Author:

Martijn W. van der Lee

Constructor Summary

PExcept(PObject parserLeft, PObject parserRight)
Sole constructor taking a left-hand and right-hand pobs.PObject.

Method Summary

PMatch

parse(PScanner input, long begin, PContext context)

Methods inherited from class pobs.PParser

addControl, getErrorInfo, process, setErrorInfo, setMatchAction, setMismatchAction

Methods inherited from class java.lang.Object

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

Constructor Detail

PExcept

public PExcept(PObject parserLeft,
               PObject parserRight)

Sole constructor taking a left-hand and right-hand pobs.PObject.

Parameters:

parserLeft - the left-hand parser, which must match

parserRight - the right-hand parser, which must not match

Method Detail

parse

public PMatch parse(PScanner input,
                    long begin,
                    PContext context)

Parameters:

input - Input to be parsed.

begin - Index of first character of input to be parsed.

context - Parsing context.

Returns:

Parsing result.