org.extex.base.parser.dimen
Class LengthParser

java.lang.Object
  org.extex.base.parser.dimen.LengthParser

public final class LengthParser
extends java.lang.Object

This class provides some static methods to parse an expression and return its value.

Version:

$Revision: 4726 $

Author:

Gerd Neugebauer

Method Summary

static void	evalTerm(Accumulator accumulator, Context context, TokenSource source, Typesetter typesetter) Evaluate a terminal.
static Dimen	parse(Context context, TokenSource source, Typesetter typesetter) Creates a new object from a token stream.
static void	register(java.lang.String name, Function function) Register a function.
static void	register(java.lang.String name, Function0 function) Register a function of arity 0 alas a constant.
static void	register(java.lang.String name, Function1 function) Register a function of arity 1.
static void	register(java.lang.String name, org.extex.base.parser.dimen.Function2 function) Register a function of arity 2.

Methods inherited from class java.lang.Object

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

Method Detail

evalTerm

public static void evalTerm(Accumulator accumulator,
                            Context context,
                            TokenSource source,
                            Typesetter typesetter)
                     throws HelpingException,
                            TypesetterException

Evaluate a terminal.

Parameters:

accumulator - the accumulator to receive the result

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Throws:

HelpingException - in case of an error

TypesetterException - in case of an error in the typesetter

parse

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

Creates a new object from a token stream.

Parameters:

context - the interpreter context

source - the source for next tokens

typesetter - the typesetter

Returns:

a new instance with the value acquired

Throws:

HelpingException - in case of an error

TypesetterException - in case of an error in the typesetter

register

public static void register(java.lang.String name,
                            Function function)

Register a function.

Parameters:

name - the name of the function

function - the function

register

public static void register(java.lang.String name,
                            Function0 function)

Register a function of arity 0 alas a constant.

Parameters:

name - the name of the function

function - the function

register

public static void register(java.lang.String name,
                            Function1 function)

Register a function of arity 1.

Parameters:

name - the name of the function

function - the function

register

public static void register(java.lang.String name,
                            org.extex.base.parser.dimen.Function2 function)

Register a function of arity 2.

Parameters:

name - the name of the function

function - the function