/* Lexical scanner for calc */
%%
%{
private java_cup.runtime.Symbol tok(int k, Object val)
  { return new java_cup.runtime.Symbol(k, yychar, yychar+yylength(), val); }
%}

%function next_token
%type java_cup.runtime.Symbol
%char
%eofval{
  {return tok(sym.EOF,null); }
%eofval}

ALPHA=[A-Za-z]
DIGIT=[0-9]
DIGITS=[0-9]+
NONNEWLINE_WHITE_SPACE=[\ \t\b\012]
WHITE_SPACE=[\n\ \t\b\012]
STRING_TEXT=(\\\"|[^\n\"]|\\{WHITE_SPACE}+\\)*
COMMENT_TEXT=([^/*\n]|[^*\n]"/"[^*\n]|[^/\n]"*"[^/\n]|"*"[^/\n]|"/"[^*\n])*

%%
<YYINITIAL>{WHITE_SPACE}+ {}
<YYINITIAL>"+"      { return tok(sym.PLUS, null); }
<YYINITIAL>"*"      { return tok(sym.TIMES, null); }
<YYINITIAL>"("      { return tok(sym.LPAREN, null); }
<YYINITIAL>")"      { return tok(sym.RPAREN, null); }
<YYINITIAL>{DIGITS}  { return tok(sym.CONST, yytext()); }