org.ow2.opensuit.cel.impl.tree.impl
Class Scanner

java.lang.Object
  org.ow2.opensuit.cel.impl.tree.impl.Scanner

public class Scanner
extends java.lang.Object

Handcrafted scanner.

Author:

Christoph Beck

Nested Class Summary

static class	Scanner.ExtensionToken
static class	Scanner.ScanException Scan exception type
static class	Scanner.Symbol Symbol type
static class	Scanner.Token

Field Summary

protected java.lang.StringBuilder	builder
protected java.lang.String	input

Constructor Summary

protected

Scanner(java.lang.String input) Constructor.

Method Summary

protected Scanner.Token	fixed(Scanner.Symbol symbol)
protected int	getPosition()
protected Scanner.Token	getToken()
protected boolean	isDigit(char c)
protected boolean	isEval()
protected Scanner.Token	keyword(java.lang.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, java.lang.String value, int length)

Methods inherited from class java.lang.Object

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

Field Detail

input

protected final java.lang.String input

builder

protected final java.lang.StringBuilder builder

Constructor Detail

Scanner

protected Scanner(java.lang.String input)

Constructor.

Parameters:

input - expression string

Method Detail

getToken

protected Scanner.Token getToken()

Returns:

current token

getPosition

protected 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(java.lang.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,
                              java.lang.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