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%{
#include "cibic.tab.h"
int yycolumn = 1;
char linebuff[1024], *lptr = linebuff;
#define YY_USER_ACTION \
do { \
yylloc.first_line = yylloc.last_line = yylineno; \
yylloc.first_column = yycolumn; yylloc.last_column = yycolumn + yyleng - 1; \
yycolumn += yyleng; \
memmove(lptr, yytext, yyleng); \
lptr += yyleng; \
} while (0);
#define NEW_LINE_USER_ACTION \
do { \
yycolumn = 1; \
lptr = linebuff; \
} while (0)
%}
letter [a-zA-Z_$]
digit [0-9]
string ((\\.|[^\n\"\\])*)
char ([^\n'\\]|\\.|\\[0-7]+|\\[xX][0-9a-fA-F]+)
%s IN_BLOCK_COMMENT IN_INLINE_COMMENT IN_DIRECTIVE
%option yylineno
%%
<INITIAL>{
"/*" BEGIN(IN_BLOCK_COMMENT);
}
<IN_BLOCK_COMMENT>{
"*/" BEGIN(INITIAL);
[^*\n]+ // eat comment in chunks
"*" // eat the lone star
\n { NEW_LINE_USER_ACTION; }
}
<INITIAL>{
"//" BEGIN(IN_INLINE_COMMENT);
}
<IN_INLINE_COMMENT>{
\n { NEW_LINE_USER_ACTION; BEGIN(INITIAL); }
[^\n]+
}
<INITIAL>{
"#" BEGIN(IN_DIRECTIVE);
}
<IN_DIRECTIVE>{
\n { NEW_LINE_USER_ACTION; BEGIN(INITIAL); }
[^\n]+
}
"void" { return KW_VOID; }
"char" { return KW_CHAR; }
"int" { return KW_INT; }
"struct" { return KW_STRUCT; }
"union" { return KW_UNION; }
"if" { return KW_IF; }
"else" { return KW_ELSE; }
"while" { return KW_WHILE; }
"for" { return KW_FOR; }
"continue" { return KW_CONT; }
"break" { return KW_BREAK; }
"return" { return KW_RET; }
"sizeof" { return KW_SIZEOF; }
{letter}({letter}|{digit})* {
yylval.strval = strdup(yytext);
return IDENTIFIER;
}
({digit}+)|(0[xX][0-9a-fA-F]+) {
if (*yytext == '0')
{
if (*(yytext + 1) == 'x' || *(yytext + 1) == 'X')
sscanf(yytext, "%x", &yylval.intval);
else // FIXME: error report if it is not a valid octal
sscanf(yytext, "%o", &yylval.intval);
}
else yylval.intval = atoi(yytext);
return INT_CONST;
}
'{char}' {
yylval.strval = strdup(yytext);
return CHAR_CONST;
}
'{char}? {
yyerror("missing terminating ' character\n");
exit(1);
}
\"{string}\" {
yylval.strval = strndup(yytext + 1, strlen(yytext) - 2);
return STR_CONST;
}
\"{string}? {
yyerror("missing terminating \" character\n");
exit(1);
}
"||" { return OPT_OR; }
"&&" { return OPT_AND; }
"==" { return OPT_EQ; }
"!=" { return OPT_NE; }
"<=" { return OPT_LE; }
">=" { return OPT_GE; }
"<<" { return OPT_SHL; }
">>" { return OPT_SHR; }
"++" { return OPT_INC; }
"--" { return OPT_DEC; }
"->" { return OPT_PTR; }
"*=" { return ASS_MUL; }
"/=" { return ASS_DIV; }
"%=" { return ASS_MOD; }
"+=" { return ASS_ADD; }
"-=" { return ASS_SUB; }
"<<=" { return ASS_SHL; }
">>=" { return ASS_SHR; }
"&=" { return ASS_AND; }
"^=" { return ASS_XOR; }
"|=" { return ASS_OR; }
[();,={}\[\]*|\^&<>+\-*//%~!.] { return *yytext; }
[ \t\r] /* skip whitespaces */
\n { NEW_LINE_USER_ACTION; }
. { return UNKNOWN; }
%%
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