diff options
Diffstat (limited to 'cibic.l')
| -rw-r--r-- | cibic.l | 141 |
1 files changed, 141 insertions, 0 deletions
@@ -0,0 +1,141 @@ +%{ +#include "cibic.tab.h" +#include "const.h" +#include "semantics.h" +int yycolumn = 1; +char linebuff[MAX_LINEBUFF], *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; } +"typedef" { return KW_TYPEDEF; } + +{letter}({letter}|{digit})* { + yylval.strval = strdup(yytext); + return is_identifier(yytext) ? IDENTIFIER : USER_TYPE; +} + +({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 = strndup(yytext + 1, strlen(yytext) - 2); + 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; } +%% |