de.dante.extex.interpreter.expression
Interface ETypeParser

All Known Implementing Classes:

TBooleanParser, TCountParser, TDoubleParser, TGlueParser

public interface ETypeParser

This interface describes a parser which can be registered in the evaluator.

Version:

$Revision: 1.1 $

Author:

Gerd Neugebauer

convert

public EType convert(Code code,
                     Context context,
                     TokenSource source,
                     Typesetter typesetter)
              throws InterpreterException

Try to convert some code into a proper data type.

Parameters:

code - the code to convert

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Returns:

the converted value or null if the conversion could not be performed

Throws:

InterpreterException - in case of an error

parse

public EType parse(Context context,
                   TokenSource source,
                   Typesetter typesetter)
            throws InterpreterException

Try to parse a proper value from the token source.

Parameters:

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Returns:

the element inquired or null if none could be parsed

Throws:

InterpreterException - in case of an error

registered

public void registered(Evaluator evaluator)

Inform the parser that it has been registered in an evaluator. In this case the parser can register some functions in the evaluator.

Parameters:

evaluator - the evaluator where the parser has been registered