// MiniJava Lexical Analyzer Specification

package parse;

%%

%implements java_cup.runtime.Scanner
%function next_token
%type java_cup.runtime.Symbol
%char

%state COMMENT

%{
private errormsg.ErrorMsg errorMsg;

private java_cup.runtime.Symbol tok(int kind, Object value) {
return new java_cup.runtime.Symbol(kind, yychar, yychar+yylength(), value);
}

Yylex(java.io.InputStream s, errormsg.ErrorMsg e) {
this(s);
errorMsg=e;
}

private int openComments = 0;
private int commentPos = 0;

%}

%eofval{
{
if (openComments != 0)
errorMsg.error(commentPos,"Unclosed comment: " + yytext());

return tok(sym.EOF, null);
}
%eofval}

%%

<YYINITIAL> class {return tok(sym.CLASS, null);}
<YYINITIAL> public {return tok(sym.PUBLIC, null);}
<YYINITIAL> static {return tok(sym.STATIC, null);}
<YYINITIAL> void {return tok(sym.VOID,null);}
<YYINITIAL> main {return tok(sym.MAIN,null);}
<YYINITIAL> String {return tok(sym.STRING,null);}
<YYINITIAL> return {return tok(sym.RETURN,null);}
<YYINITIAL> int {return tok(sym.INT,null);}
<YYINITIAL> boolean {return tok(sym.BOOLEAN,null);}
<YYINITIAL> while {return tok(sym.WHILE,null);}
<YYINITIAL> if {return tok(sym.IF,null);}
<YYINITIAL> else {return tok(sym.ELSE,null);}
<YYINITIAL> System\.out\.println {return tok(sym.PRINTLN,null);}
<YYINITIAL> length {return tok(sym.LENGTH,null);}
<YYINITIAL> true {return tok(sym.TRUE,null);}
<YYINITIAL> false {return tok(sym.FALSE,null);}
<YYINITIAL> this {return tok(sym.THIS,null);}
<YYINITIAL> new {return tok(sym.NEW,null);}
<YYINITIAL> \( {return tok(sym.LPAREN,null);}
<YYINITIAL> \) {return tok(sym.RPAREN,null);}
<YYINITIAL> \[ {return tok(sym.LBRACK,null);}
<YYINITIAL> \] {return tok(sym.RBRACK,null);}
<YYINITIAL> \{ {return tok(sym.LBRACE,null);}
<YYINITIAL> \} {return tok(sym.RBRACE,null);}
<YYINITIAL> \+ {return tok(sym.PLUS,null);}
<YYINITIAL> \- {return tok(sym.MINUS,null);}
<YYINITIAL> \* {return tok(sym.TIMES,null);}
<YYINITIAL> < {return tok(sym.LT,null);}
<YYINITIAL> , {return tok(sym.COMMA,null);}
<YYINITIAL> = {return tok(sym.ASSIGN,null);}
<YYINITIAL> \. {return tok(sym.DOT,null);}
<YYINITIAL> ! {return tok(sym.EXCLAMATION,null);}
<YYINITIAL> && {return tok(sym.AND,null);}
<YYINITIAL> ; {return tok(sym.SEMICOLON,null);}
<YYINITIAL> [a-zA-Z][a-zA-Z0-9_]* {return tok(sym.ID,yytext());}
<YYINITIAL> [0-9]+ {return tok(sym.INTEGER_LITERAL, Integer.parseInt(yytext()));}
<YYINITIAL> "//".* {}
<YYINITIAL> "/*" {openComments++; commentPos = yychar; yybegin(COMMENT);}
<COMMENT> [^*/]* {}
<COMMENT> "*/" {openComments--; yybegin(YYINITIAL);}
<COMMENT> . {}

<YYINITIAL> [\ \t\n]+ { }
<YYINITIAL> . {errorMsg.error(yychar,
"unmatched input: " + yytext());}

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