com.scriptbasic.lexer

Class BasicLexicalAnalyzer

java.lang.Object

com.scriptbasic.lexer.BasicLexicalAnalyzer

All Implemented Interfaces:

FactoryManaged, LexicalAnalyzer, LineOrientedLexicalAnalyzer

Direct Known Subclasses:

ScriptBasicLexicalAnalyzer

public class BasicLexicalAnalyzer
extends Object
implements LineOrientedLexicalAnalyzer

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BasicLexicalAnalyzer()

Method Summary

Methods

Modifier and Type	Method and Description
LexicalElement	get() Get the next lexical element from the input stream.
Factory	getFactory()
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	resetLine() Resets the state of the lexical analyzer so that the internal lexeme pointer is reset to the first lexeme of the actual line and the next call to LexicalAnalyzer.get() will return again the first lexeme of the line.
void	set(Reader reader) Set the reader from where the lexical analyzer has to read the input.
void	setFactory(Factory factory) When a factory creates an instance of a class implementing this interface this method is called to register the factory that created the instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicLexicalAnalyzer

protected BasicLexicalAnalyzer()

Method Detail

getFactory

public Factory getFactory()

setFactory

public void setFactory(Factory factory)

Description copied from interface: FactoryManaged

When a factory creates an instance of a class implementing this interface this method is called to register the factory that created the instance.

Specified by:

setFactory in interface FactoryManaged

Parameters:

factory - the factory that manages the instance.

set

public void set(Reader reader)

Description copied from interface: LexicalAnalyzer

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

Specified by:

set in interface LexicalAnalyzer

registerElementAnalyzer

public void registerElementAnalyzer(LexicalElementAnalyzer lea)

Description copied from interface: LexicalAnalyzer

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

Specified by:

registerElementAnalyzer in interface LexicalAnalyzer

resetLine

public void resetLine()

Description copied from interface: LineOrientedLexicalAnalyzer

Resets the state of the lexical analyzer so that the internal lexeme pointer is reset to the first lexeme of the actual line and the next call to LexicalAnalyzer.get() will return again the first lexeme of the line.

Specified by:

resetLine in interface LineOrientedLexicalAnalyzer

get

public LexicalElement get()
                   throws AnalysisException

Description copied from interface: LexicalAnalyzer

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

Specified by:

get in interface LexicalAnalyzer

Returns:

Throws:

AnalysisException

peek

public 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 LexicalAnalyzer.get() will return the same lexical element. Calling LexicalAnalyzer.get() will return the same lexical element as the last call to peek().

Specified by:

peek in interface LexicalAnalyzer

Throws:

AnalysisException