com.oracle.truffle.regex.nashorn.parser

Class Scanner

java.lang.Object

com.oracle.truffle.regex.nashorn.parser.Scanner

Direct Known Subclasses:

RegExpScanner

public class Scanner
extends Object

Utility for scanning thru a char array.

Field Summary

Fields

Modifier and Type	Field and Description
protected char	ch0 Current character in stream
protected char	ch1 1 character lookahead
protected char	ch2 2 character lookahead
protected char	ch3 3 character lookahead
protected char[]	content Characters to scan.
protected int	limit Scan limit.
protected int	position Position in content.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Scanner(char[] content, int start, int length) Constructor
protected	Scanner(String content) Constructor Scan content from beginning to end.

Method Summary

Modifier and Type	Method and Description
protected boolean	atEOF() Returns true of scanner is at end of input
protected char	charAt(int i) Get the ith character from the content.
protected String	getContents()
protected void	reset(int i) Reset to a character position.
protected void	skip(int n) Skip ahead a number of characters.

Methods inherited from class java.lang.Object

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

Field Detail

content

protected final char[] content

Characters to scan.

position

protected int position

Position in content.

limit

protected final int limit

Scan limit.

ch0

protected char ch0

Current character in stream

ch1

protected char ch1

1 character lookahead

ch2

protected char ch2

2 character lookahead

ch3

protected char ch3

3 character lookahead

Constructor Detail

Scanner

protected Scanner(char[] content,
                  int start,
                  int length)

Constructor

Parameters:

content - content to scan

start - position index in content where to start

length - length of input

Scanner

protected Scanner(String content)

Constructor Scan content from beginning to end. Content given as a string

Parameters:

content - content to scan

Method Detail

atEOF

protected final boolean atEOF()

Returns true of scanner is at end of input

Returns:

true if no more input

charAt

protected final char charAt(int i)

Get the ith character from the content.

Parameters:

i - Index of character.

Returns:

ith character or '\0' if beyond limit.

reset

protected final void reset(int i)

Reset to a character position.

Parameters:

i - Position in content.

skip

protected final void skip(int n)

Skip ahead a number of characters.

Parameters:

n - Number of characters to skip.

getContents

protected String getContents()