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/*
* flex equivalent to cppscan.rl
*/
%{
#include <stdio.h>
#define TK_Dlit 256
#define TK_Slit 257
#define TK_Float 258
#define TK_Id 259
#define TK_NameSep 260
#define TK_Arrow 261
#define TK_PlusPlus 262
#define TK_MinusMinus 263
#define TK_ArrowStar 264
#define TK_DotStar 265
#define TK_ShiftLeft 266
#define TK_ShiftRight 267
#define TK_IntegerDecimal 268
#define TK_IntegerOctal 269
#define TK_IntegerHex 270
#define TK_EqualsEquals 271
#define TK_NotEquals 272
#define TK_AndAnd 273
#define TK_OrOr 274
#define TK_MultAssign 275
#define TK_DivAssign 276
#define TK_PercentAssign 277
#define TK_PlusAssign 278
#define TK_MinusAssign 279
#define TK_AmpAssign 280
#define TK_CaretAssign 281
#define TK_BarAssign 282
#define TK_DotDotDot 283
#define TK_Whitespace 284
#define TK_Comment 285
int line = 1, col = 1;
void token( int tok, char *data, int len )
{
printf( "<%i> ", tok );
for ( int i = 0; i < len; i++ )
fputc( data[i], stdout );
fputc( '\n', stdout );
/* Count newlines and columns. This code is here mainly for having some
* code in the token routine when commenting out the above output during
* performance testing. */
for ( int i = 0; i < len; i ++ ) {
if ( data[i] == '\n' ) {
line += 1;
col = 1;
}
else {
col += 1;
}
}
}
%}
%x COMMENT
FRACT_CONST [0-9]*\.[0-9]+|[0-9]+\.
EXPONENT [eE][+\-]?[0-9]+
FLOAT_SUFFIX [flFL]
%%
/* Single and double literals. */
L?\'([^\'\\\n]|\\.)*\' {
token( TK_Slit, yytext, yyleng );
}
L?\"([^\"\\\n]|\\.)*\" {
token( TK_Dlit, yytext, yyleng );
}
[a-zA-Z_][a-zA-Z0-9_]* {
token( TK_Id, yytext, yyleng );
}
{FRACT_CONST}{EXPONENT}?{FLOAT_SUFFIX}?|[0-9]+{EXPONENT}{FLOAT_SUFFIX}? {
token( TK_Float, yytext, yyleng );
}
(0|[1-9][0-9]*)[ulUL]{0,3} {
token( TK_IntegerDecimal, yytext, yyleng );
}
0[0-9]+[ulUL]{0,2} {
token( TK_IntegerOctal, yytext, yyleng );
}
0x[0-9a-fA-F]+[ulUL]{0,2} {
token( TK_IntegerHex, yytext, yyleng );
}
:: token( TK_NameSep, yytext, yyleng );
== token( TK_EqualsEquals, yytext, yyleng );
!= token( TK_NotEquals, yytext, yyleng );
&& token( TK_AndAnd, yytext, yyleng );
\|\| token( TK_OrOr, yytext, yyleng );
\*= token( TK_MultAssign, yytext, yyleng );
\/= token( TK_DivAssign, yytext, yyleng );
%= token( TK_PercentAssign, yytext, yyleng );
\+= token( TK_PlusAssign, yytext, yyleng );
-= token( TK_MinusAssign, yytext, yyleng );
&= token( TK_AmpAssign, yytext, yyleng );
^= token( TK_CaretAssign, yytext, yyleng );
\|= token( TK_BarAssign, yytext, yyleng );
\+\+ token( TK_PlusPlus, yytext, yyleng );
-- token( TK_MinusMinus, yytext, yyleng );
-> token( TK_Arrow, yytext, yyleng );
->\* token( TK_ArrowStar, yytext, yyleng );
\.\* token( TK_DotStar, yytext, yyleng );
\.\.\. token( TK_DotDotDot, yytext, yyleng );
\/\* BEGIN(COMMENT);
<COMMENT>\*\/ BEGIN(INITIAL);
<COMMENT>(.|\n) { }
\/\/.*\n {}
[^!-~]+ {}
[!-/:-@\[-`{-~] token( yytext[0], yytext, yyleng );
%%
int yywrap()
{
/* Once the input is done, no more. */
return 1;
}
int main()
{
yylex();
}
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