Package de.odysseus.el.tree.impl

Class Scanner

java.lang.Object

de.odysseus.el.tree.impl.Scanner

public class Scanner
extends Object

Handcrafted scanner.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Scanner.ExtensionToken
static class	Scanner.ScanException	Scan exception type
static enum	Scanner.Symbol	Symbol type
static class	Scanner.Token

Field Summary

Fields

Modifier and Type	Field	Description
protected final StringBuilder	builder
private static final HashMap<Scanner.Symbol,Scanner.Token>	FIXMAP
private final String	input
private static final HashMap<String,Scanner.Token>	KEYMAP
private int	position
private Scanner.Token	token

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Scanner(String input)	Constructor.

Method Summary

Modifier and Type	Method	Description
private static void	addFixToken(Scanner.Token token)
private static void	addKeyToken(Scanner.Token token)
protected Scanner.Token	fixed(Scanner.Symbol symbol)
String	getInput()
int	getPosition()
Scanner.Token	getToken()
protected boolean	isDigit(char c)
protected boolean	isEval()
protected Scanner.Token	keyword(String s)
Scanner.Token	next()	Scan next token.
protected Scanner.Token	nextEval()	token inside an eval expression
protected Scanner.Token	nextNumber()	number token
protected Scanner.Token	nextString()	string token
protected Scanner.Token	nextText()	text token
protected Scanner.Token	nextToken()
protected Scanner.Token	token(Scanner.Symbol symbol, String value, int length)

Methods inherited from class java.lang.Object

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

Field Details

KEYMAP

private static final HashMap<String,Scanner.Token> KEYMAP

FIXMAP

private static final HashMap<Scanner.Symbol,Scanner.Token> FIXMAP

token

private Scanner.Token token

position

private int position

input

private final String input

builder

protected final StringBuilder builder

Constructor Details

Scanner

protected Scanner(String input)

Constructor.

Parameters:

input - expression string

Method Details

addFixToken

private static void addFixToken(Scanner.Token token)

addKeyToken

private static void addKeyToken(Scanner.Token token)

getInput

public String getInput()

getToken

public Scanner.Token getToken()

Returns:

current token

getPosition

public int getPosition()

Returns:

current input position

isDigit

protected boolean isDigit(char c)

Returns:

true iff the specified character is a digit

keyword

protected Scanner.Token keyword(String s)

Parameters:

s - name

Returns:

token for the given keyword or null

fixed

protected Scanner.Token fixed(Scanner.Symbol symbol)

Parameters:

symbol -

Returns:

token for the given symbol

token

protected Scanner.Token token(Scanner.Symbol symbol,
 String value,
 int length)

isEval

protected boolean isEval()

nextText

protected Scanner.Token nextText()
                          throws Scanner.ScanException

text token

Throws:

Scanner.ScanException

nextString

protected Scanner.Token nextString()
                            throws Scanner.ScanException

string token

Throws:

Scanner.ScanException

nextNumber

protected Scanner.Token nextNumber()
                            throws Scanner.ScanException

number token

Throws:

Scanner.ScanException

nextEval

protected Scanner.Token nextEval()
                          throws Scanner.ScanException

token inside an eval expression

Throws:

Scanner.ScanException

nextToken

protected Scanner.Token nextToken()
                           throws Scanner.ScanException

Throws:

Scanner.ScanException

next

public Scanner.Token next()
                   throws Scanner.ScanException

Scan next token. After calling this method, getToken() and getPosition() can be used to retreive the token's image and input position.

Returns:

scanned token

Throws:

Scanner.ScanException