com.scriptbasic.interfaces

Interface LexicalAnalyzer

All Superinterfaces:

FactoryManaged

All Known Subinterfaces:

LineOrientedLexicalAnalyzer

All Known Implementing Classes:

BasicLexicalAnalyzer, ScriptBasicLexicalAnalyzer

public interface LexicalAnalyzer
extends FactoryManaged

A generic lexical analyzer that reads the characters from a reader and returns the LexicalElements one after the other.

The actual implementation specifies what lexical elements that identifies and returns.

Author:

Peter Verhas

Method Summary

Methods

Modifier and Type	Method and Description
LexicalElement	get() Get the next lexical element from the input stream.
LexicalElement	peek() Peek at the next lexical element and do not remove it from the input stream.
void	registerElementAnalyzer(LexicalElementAnalyzer lea) Register a lexical element analyzer.
void	set(Reader reader) Set the reader from where the lexical analyzer has to read the input.

Methods inherited from interface com.scriptbasic.interfaces.FactoryManaged

setFactory

Method Detail

set

void set(Reader reader)

Set the reader from where the lexical analyzer has to read the input.

Parameters:

reader -

get

LexicalElement get()
                   throws AnalysisException

Get the next lexical element from the input stream. If there are no more lexical elements then return null

Returns:

Throws:

AnalysisException

peek

LexicalElement peek()
                    throws AnalysisException

Peek at the next lexical element and do not remove it from the input stream. Consecutive calls to peek() without calling get() will return the same lexical element. Calling get() will return the same lexical element as the last call to peek().

Throws:

AnalysisException

registerElementAnalyzer

void registerElementAnalyzer(LexicalElementAnalyzer lea)

Register a lexical element analyzer. The lexical element analyzers are consulted in the order they are registered to match a lexeme.

Parameters:

lea -