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Java Source Code / Java Documentation » 6.0 JDK Modules sun » tools » sun.tools.java

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

sun.tools.java .Scanner

All known Subclasses:   sun.tools.java .Parser,
Scanner
public class Scanner implements Constants(Code)
A Scanner for Java tokens. Errors are reported to the environment object.
The scanner keeps track of the current token, the value of the current token (if any), and the start position of the current token.
The scan() method advances the scanner to the next token in the input.
The match() method is used to quickly match opening brackets (ie: '(', '{', or '[') with their closing counter part. This is useful during error recovery.
An position consists of: ((linenr << WHEREOFFSETBITS) | offset) this means that both the line number and the exact offset into the file are encoded in each position value.
The compiler treats either "\n", "\r" or "\r\n" as the end of a line.
WARNING: The contents of this source file are not part of any supported API. Code that depends on them does so at its own risk: they are subject to change or removal without notice.
author:
   Arthur van Hoff
version:
   1.60, 12/15/96

Field Summary
final public static int EOF

final public static long LINEINC
     The increment for each line.
final public static long OFFSETINC
     The increment for each character.
protected int ch

public char charValue

public String docComment

public double doubleValue

public Environment env

public float floatValue

public Identifier idValue

protected ScannerInputReader in

public int intValue

public long longValue

public long pos

public long prevPos

public int radix

public boolean scanComments
     If true, present all comments as tokens.
public String stringValue

public int token


Constructor Summary
public Scanner(Environment env, InputStream in)
     Create a scanner to scan an input stream.
protected Scanner(Environment env)
     Create a scanner to scan an input stream.

Method Summary
public long getEndPos()

public IdentifierToken getIdToken()
     If the current token is IDENT, return the identifier occurrence.
public void match(int open, int close)
     Scan to a matching '}', ']' or ')'.
public long scan()
     Scan the next token.
protected void useInputStream(InputStream in)
     Setup input from the given input stream, and scan the first token from it.
protected long xscan()


Field Detail
EOF
final public static int EOF(Code)
End of input

LINEINC
final public static long LINEINC(Code)
The increment for each line.

OFFSETINC
final public static long OFFSETINC(Code)
The increment for each character.

ch
protected int ch(Code)
The current character

charValue
public char charValue(Code)

docComment
public String docComment(Code)

doubleValue
public double doubleValue(Code)

env
public Environment env(Code)
Where errors are reported

floatValue
public float floatValue(Code)

idValue
public Identifier idValue(Code)

in
protected ScannerInputReader in(Code)
Input reader

intValue
public int intValue(Code)

longValue
public long longValue(Code)

pos
public long pos(Code)
The position of the current token

prevPos
public long prevPos(Code)
The position of the previous token

radix
public int radix(Code)

scanComments
public boolean scanComments(Code)
If true, present all comments as tokens. Contents are not saved, but positions are recorded accurately, so the comment can be recovered from the text. Line terminations are also returned as comment tokens, and may be distinguished by their start and end positions, which are equal (meaning, these tokens contain no chars).

stringValue
public String stringValue(Code)

token
public int token(Code)
Current token

Constructor Detail
Scanner
public Scanner(Environment env, InputStream in) throws IOException(Code)
Create a scanner to scan an input stream.

Scanner
protected Scanner(Environment env)(Code)
Create a scanner to scan an input stream.

Method Detail
getEndPos
public long getEndPos()(Code)
The ending position of the current token

getIdToken
public IdentifierToken getIdToken()(Code)
If the current token is IDENT, return the identifier occurrence. It will be freshly allocated.

match
public void match(int open, int close) throws IOException(Code)
Scan to a matching '}', ']' or ')'. The current token must be a '{', '[' or '(';

scan
public long scan() throws IOException(Code)
Scan the next token. the position of the previous token.

useInputStream
protected void useInputStream(InputStream in) throws IOException(Code)
Setup input from the given input stream, and scan the first token from it.

xscan
protected long xscan() throws IOException(Code)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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