com.scriptbasic.interfaces

Interface LexicalElement

All Superinterfaces:

SourceLocationBound

All Known Implementing Classes:

AbstractLexicalElement, BasicLexicalElement

public interface LexicalElement
extends SourceLocationBound

A single lexical element that was created by the LexicalAnalyer

Author:

Peter Verhas

Field Summary

Fields

Modifier and Type	Field and Description
static int	TYPE_BOOLEAN
static int	TYPE_DOUBLE
static int	TYPE_IDENTIFIER
static int	TYPE_LONG
static int	TYPE_STRING
static int	TYPE_SYMBOL

Method Summary

Methods

Modifier and Type	Method and Description
Boolean	booleanValue()
Double	doubleValue()
String	getLexeme() Get the original representation of the lexical element the way it was specified in the source code.
int	getType() Get the type of the lexical element.
Boolean	isBoolean()
Boolean	isDouble()
Boolean	isIdentifier()
Boolean	isLineTerminator()
Boolean	isLiteralConstant()
Boolean	isLong()
Boolean	isNumeric()
Boolean	isString()
Boolean	isSymbol()
Boolean	isSymbol(String lexeme) Return true if the lexical element is a symbol and the lexeme matches the the actual symbol.
Long	longValue() Get the long value of the element.
String	stringValue() Get the string value of the lexical element.

Methods inherited from interface com.scriptbasic.interfaces.SourceLocationBound

getFileName, getLineNumber, getPosition

Field Detail

TYPE_STRING

static final int TYPE_STRING

See Also:

Constant Field Values

TYPE_DOUBLE

static final int TYPE_DOUBLE

See Also:

Constant Field Values

TYPE_LONG

static final int TYPE_LONG

See Also:

Constant Field Values

TYPE_BOOLEAN

static final int TYPE_BOOLEAN

See Also:

Constant Field Values

TYPE_IDENTIFIER

static final int TYPE_IDENTIFIER

See Also:

Constant Field Values

TYPE_SYMBOL

static final int TYPE_SYMBOL

See Also:

Constant Field Values

Method Detail

getLexeme

String getLexeme()

Get the original representation of the lexical element the way it was specified in the source code.

Returns:

the lexical element as string

getType

int getType()

Get the type of the lexical element.

Returns:

stringValue

String stringValue()

Get the string value of the lexical element. This method should be called only when the lexical element is a string literal. Otherwise the implementation will throw IllegalArgumentException();

Returns:

longValue

Long longValue()

Get the long value of the element. This method should only be called when the type of the symbol is long. Otherwise the implementation will throw IllegalArgumentException();

Returns:

Throws:

IllegalArgumentException

doubleValue

Double doubleValue()

booleanValue

Boolean booleanValue()

isString

Boolean isString()

isDouble

Boolean isDouble()

isLong

Boolean isLong()

isBoolean

Boolean isBoolean()

isNumeric

Boolean isNumeric()

isLiteralConstant

Boolean isLiteralConstant()

isIdentifier

Boolean isIdentifier()

isSymbol

Boolean isSymbol()

isSymbol

Boolean isSymbol(String lexeme)

Return true if the lexical element is a symbol and the lexeme matches the the actual symbol.

Parameters:

lexeme - to match by the lexical element. The parameter must not ne null.

Returns:

true if the lexical element is a symbol and the lexeme matches the parameter lexeme.

isLineTerminator

Boolean isLineTerminator()