AST
Class PicoJavaScanner

General Info

Type Hierarchy:

java.lang.Object
  beaver.Scanner
      AST.PicoJavaScanner

Nested classes/interfaces inherited from beaver.Scanner

beaver.Scanner.Exception

Description

This class is a scanner generated by JFlex 1.4 on 2018-09-03 16:10 from the specification file /home/csz-naf/examples/PicoJava/spec/picojava.flex

Member Filters

API level:

high-level

low-level

internal-level

Aspect:

Constructors

public PicoJavaScanner(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.

public PicoJavaScanner(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.

Methods

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

Closes the input stream.

Throws:

java.io.IOException

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

Resets the scanner to read from a new input stream. Does not close the old reader. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost). Lexical state is set to ZZ_INITIAL.

Parameters:

reader - the new input stream

public final int yystate()

Returns the current lexical state.

public final void yybegin(int newState)

Enters a new lexical state

Parameters:

newState - the new lexical state

public final java.lang.String yytext()

Returns the text matched by the current regular expression.

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

public final int yylength()

Returns the length of the matched text region.

public void yypushback(int number)

Pushes the specified amount of characters back into the input stream. They will be read again by then next call of the scanning method

Parameters:

number - the number of characters to be read again. This number must not be greater than yylength()!

public beaver.Symbol nextToken()
                        throws java.io.IOException,
                               beaver.Scanner.Exception

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 class beaver.Scanner

Returns:

the next token

Throws:

java.io.IOException - if any I/O-Error occurs

beaver.Scanner.Exception

Fields

public static final int YYEOF

This character denotes the end of file

See Also:

Constant Field Values

public static final int YYINITIAL

lexical states

See Also:

Constant Field Values

Inherited Members

Methods inherited from class java.lang.Object

clone

equals

finalize

getClass

hashCode

notify

notifyAll

toString

wait

wait

wait