Dogcows Code - chaz/openbox/blob - obcl/lex.l

   1 %{
   2 #include "obcl.h"
   3 #include "parse.h"
   4 %}
   5
   6 %option yylineno
   7
   8 DGT   [0-9]
   9 ID    [a-zA-Z_][a-zA-Z_\.\-0-9]*
  10
  11
  12  /* string bummy */
  13 %x str
  14 %%
  15
  16        char str_buf[1024];
  17        char *str_buf_ptr;
  18        int str_char;
  19
  20  /* begin a string */
  21 [\"\'] {
  22            str_buf_ptr = str_buf;
  23            str_char = yytext[0];
  24            BEGIN(str);
  25        }
  26
  27  /* end a string */
  28 <str>[\"\'] {
  29            if (yytext[0] == str_char) {
  30                BEGIN(INITIAL);
  31                *str_buf_ptr = '\0';
  32                yylval.string = g_strdup(str_buf);
  33                return TOK_STRING;
  34            } else {
  35                *str_buf_ptr++ = yytext[0];
  36            }
  37        }
  38
  39  /* can't have newlines in strings */
  40 <str>\n {
  41            printf("Error: Unterminated string constant.\n");
  42            BEGIN(INITIAL);
  43        }
  44
  45  /* handle \" and \' */
  46 <str>"\\"[\"\'] {
  47            if (yytext[1] == str_char)
  48                *str_buf_ptr++ = yytext[1];
  49            else {
  50                *str_buf_ptr++ = yytext[0];
  51                *str_buf_ptr++ = yytext[1];
  52            }
  53        }
  54
  55  /* eat valid string contents */
  56 <str>[^\\\n\'\"]+ {
  57            char *yptr = yytext;
  58            while (*yptr) {
  59                *str_buf_ptr++ = *yptr++;
  60            }
  61        }
  62
  63  /* numberz */
  64 {DGT}+ {
  65            yylval.num = atof(yytext);
  66            return TOK_NUM;
  67        }
  68
  69  /* real numbers */
  70 {DGT}+"."{DGT}* {
  71            yylval.num = atof(yytext);
  72            return TOK_NUM;
  73        }
  74
  75  /* identifiers -- names without spaces and other crap in them */
  76 {ID}   {
  77            yylval.string = g_strdup(yytext);
  78            return TOK_ID;
  79        }
  80
  81  /* skip comments */
  82 "#".*\n     ;
  83  /* skip other whitespace */
  84 [ \n\t]+      ;
  85 .           { return yytext[0]; }
  86 %%