Package mini_c

Class Lexer

  • All Implemented Interfaces:
    java_cup.runtime.Scanner
    class Lexer
extends java.lang.Object
implements java_cup.runtime.Scanner
    This class is a scanner generated by JFlex 1.4.3 on 2/19/17 7:55 PM from the specification file src/mini_c/Lexer.flex

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int COMMENT  
      static int YYEOF
      This character denotes the end of file
      static int YYINITIAL
      lexical states

    • Constructor Summary

      Constructors 
      Constructor Description
      Lexer​(java.io.InputStream in)
      Creates a new scanner.
      Lexer​(java.io.Reader in)
      Creates a new scanner There is also a java.io.InputStream version of this constructor.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java_cup.runtime.Symbol debug_next_token()
      Same as next_token but also prints the token to standard out for debugging.
      (package private) static int decodeHexa​(java.lang.String s)  
      static void main​(java.lang.String[] argv)
      Runs the scanner on input files.
      java_cup.runtime.Symbol next_token()
      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 yypushback​(int number)
      Pushes the specified amount of characters back into the input stream.
      void yyreset​(java.io.Reader reader)
      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

    • Constructor Detail

      • Lexer

        Lexer​(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

        Lexer​(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

      • decodeHexa

        static int decodeHexa​(java.lang.String s)

      • 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)
        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

      • 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.

      • yypushback

        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()!

      • next_token

        public java_cup.runtime.Symbol next_token()
                                   throws java.io.IOException,
                                          java.lang.Exception
        Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
        Specified by:
        next_token in interface java_cup.runtime.Scanner
        Returns:
        the next token
        Throws:
        java.io.IOException - if any I/O-Error occurs
        java.lang.Exception

      • debug_next_token

        public java_cup.runtime.Symbol debug_next_token()
                                         throws java.io.IOException,
                                                java.lang.Exception
        Same as next_token but also prints the token to standard out for debugging. This code was contributed by Karl Meissner
        Throws:
        java.io.IOException
        java.lang.Exception

      • main

        public static void main​(java.lang.String[] argv)
        Runs the scanner on input files. This main method is the debugging routine for the scanner. It prints debugging information about each returned token to System.out until the end of file is reached, or an error occured.
        Parameters:
        argv - the command line, contains the filenames to run the scanner on.