Subversion Repositories programming

/*******************************************************************************

 * File: jminus.flex

 *

 * Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)

 * License: GNU General Public License v2

 *

 * This file will create a scanner for the J-Minus language using the

 * JFlex tool, available from http://jflex.de.

 ******************************************************************************/

%%

%byaccj

%{

    /* store a reference to the Parser object */

    private Parser yyparser;

    /* constructor taking an additional Parser object */

    public Yylex(java.io.Reader r, Parser yyparser)

    {

        this(r);

        this.yyparser = yyparser;

    }

%}

ID = [a-zA-Z_]([a-zA-Z_] | [0-9])*

ADDOP = "+" | "-"

MULOP = "*" | "/"

NUM = [0-9]+ ("." [0-9]+)?

WSPACE = [\ \t]+ | \n | \r | \r\n

%%

"class"     { return Parser.CLASS;      }

"public"    { return Parser.PUBLIC;     }

"private"   { return Parser.PRIVATE;    }

"int"       { return Parser.INT;        }

"float"     { return Parser.FLOAT;      }

"void"      { return Parser.VOID;       }

"if"        { return Parser.IF;         }

"else"      { return Parser.ELSE;       }

"while"     { return Parser.WHILE;      }

"return"    { return Parser.RETURN;     }

"("         { return Parser.LPAREN;     }

")"         { return Parser.RPAREN;     }

"{"         { return Parser.LBRACE;     }

"}"         { return Parser.RBRACE;     }

";"         { return Parser.SEMI;       }

"="         { return Parser.ASSIGNOP;   }

{ID}        { return Parser.ID;         }

{ADDOP}     { return Parser.ADDOP;      }

{MULOP}     { return Parser.MULOP;      }

{NUM}       { return Parser.NUM;        }

{WSPACE}    {                           }