jif.parse
Class Lexer_c

java.lang.Object
  jif.parse.Lexer_c

All Implemented Interfaces:

polyglot.lex.Lexer

public class Lexer_c

extends java.lang.Object

implements polyglot.lex.Lexer

This class is a scanner generated by JFlex 1.3.5 on 4/13/04 6:06 PM from the specification file file:/C:/data/upg/jif/src/jif/parse/jif.flex

Field Summary

static int	CHARLITERAL
static int	STRING lexical states
static int	YYEOF This character denotes the end of file
static int	YYINITIAL

Constructor Summary

Lexer_c(java.io.InputStream in)
Creates a new scanner.

Lexer_c(java.io.InputStream in, java.lang.String file, polyglot.util.ErrorQueue eq)

Lexer_c(java.io.Reader in)
Creates a new scanner There is also a java.io.InputStream version of this constructor.

Lexer_c(java.io.Reader reader, java.lang.String file, polyglot.util.ErrorQueue eq)

Method Summary

java.lang.String	file()
polyglot.lex.Token	nextToken() Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
void	yybegin(int newState) Enters a new lexical state
char	yycharat(int pos) Returns the character at position pos from the matched text.
void	yyclose() Closes the input stream.
int	yylength() Returns the length of the matched text region.
void	yyreset(java.io.Reader reader) Closes the current stream, and resets the scanner to read from a new input stream.
int	yystate() Returns the current lexical state.
java.lang.String	yytext() Returns the text matched by the current regular expression.

Methods inherited from class java.lang.Object

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

Field Detail

YYEOF

public static final int YYEOF

This character denotes the end of file

See Also:

Constant Field Values

STRING

public static final int STRING

lexical states

See Also:

Constant Field Values

YYINITIAL

public static final int YYINITIAL

See Also:

Constant Field Values

CHARLITERAL

public static final int CHARLITERAL

See Also:

Constant Field Values

Constructor Detail

Lexer_c

public Lexer_c(java.io.InputStream in,
               java.lang.String file,
               polyglot.util.ErrorQueue eq)

Lexer_c

public Lexer_c(java.io.Reader reader,
               java.lang.String file,
               polyglot.util.ErrorQueue eq)

Lexer_c

public Lexer_c(java.io.Reader in)

Creates a new scanner There is also a java.io.InputStream version of this constructor.

Parameters:

in - the java.io.Reader to read input from.

Lexer_c

public Lexer_c(java.io.InputStream in)

Creates a new scanner. There is also java.io.Reader version of this constructor.

Parameters:

in - the java.io.Inputstream to read input from.

Method Detail

file

public java.lang.String file()

Specified by:

file in interface polyglot.lex.Lexer

yyclose

public final void yyclose()
                   throws java.io.IOException

Closes the input stream.

Throws:

java.io.IOException

yyreset

public final void yyreset(java.io.Reader reader)
                   throws java.io.IOException

Closes the current stream, and resets the scanner to read from a new input stream. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost). Lexical state is set to YY_INITIAL.

Parameters:

reader - the new input stream

Throws:

java.io.IOException

yystate

public final int yystate()

Returns the current lexical state.

yybegin

public final void yybegin(int newState)

Enters a new lexical state

Parameters:

newState - the new lexical state

yytext

public final java.lang.String yytext()

Returns the text matched by the current regular expression.

yycharat

public final char yycharat(int pos)

Returns the character at position pos from the matched text. It is equivalent to yytext().charAt(pos), but faster

Parameters:

pos - the position of the character to fetch. A value from 0 to yylength()-1.

Returns:

the character at position pos

yylength

public final int yylength()

Returns the length of the matched text region.

nextToken

public polyglot.lex.Token nextToken()
                             throws java.io.IOException

Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.

Specified by:

nextToken in interface polyglot.lex.Lexer

Returns:

the next token

Throws:

IOException - if any I/O-Error occurs