org.extex.base.parser
Class ScaledNumberParser

java.lang.Object
  org.extex.base.parser.ScaledNumberParser

public class ScaledNumberParser
extends java.lang.Object

This class provides a fixed point number.

Version:

$Revision: 6191 $

Author:

Gerd Neugebauer

Method Summary

static long	parse(Context context, TokenSource source, Typesetter typesetter) Evaluate an expression.
static long	scanFloat(Context context, TokenSource source, Typesetter typesetter, Token start) Parses a token stream for a float and returns it as fixed point number.
static ScaledNumber	scanScaledNumber(Context context, TokenSource source, Typesetter typesetter) Parses a token stream for a float and returns it as fixed point number.

Methods inherited from class java.lang.Object

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

Method Detail

parse

public static long parse(Context context,
                         TokenSource source,
                         Typesetter typesetter)
                  throws HelpingException,
                         TypesetterException

Evaluate an expression.

Parameters:

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Returns:

the result

Throws:

HelpingException - in case of an error

TypesetterException - in case of an error in the typesetter

scanFloat

public static long scanFloat(Context context,
                             TokenSource source,
                             Typesetter typesetter,
                             Token start)
                      throws HelpingException,
                             TypesetterException

Parses a token stream for a float and returns it as fixed point number.

Parameters:

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

start - the initial token to start with

Returns:

the fixed point representation of the floating number in units of 2^-16.

Throws:

HelpingException - in case of an error

TypesetterException - in case of an error in the typesetter

scanScaledNumber

public static ScaledNumber scanScaledNumber(Context context,
                                            TokenSource source,
                                            Typesetter typesetter)
                                     throws HelpingException,
                                            TypesetterException

Parses a token stream for a float and returns it as fixed point number.

Parameters:

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Returns:

the fixed point representation of the floating point number

Throws:

HelpingException - in case of an error

TypesetterException - in case of an error in the typesetter