test.l

%{
#include <stdio.h>
#include "y.tab.h"

#define BFSIZE 1024
char string_buf[BFSIZE];
char *string_buf_ptr;

/* FLOATVAL [+-]?(([0-9]*\.[0-9]+|[0-9]+\.[0-9]*)([Ee][+-]?[0-9]+)?|[0-9]+[Ee][+-]?[0-9]+) */

%}

dig                        [0-9]
num1                       [-+]?{dig}+\.?([eE][-+]?{dig}+)?
num2                       [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
FLOATVAL                   {num1}|{num2}
INTVAL                     {dig}+
ID                         [\_a-zA-Z][\_a-zA-Z0-9]*

ESCSTR                     '(\\.|''|[^'\n])*' | \"(\\.|\"\"|[^"\n])*\"

%x str

%%

\{                          {return OBRACKET;}
\}                          {return CBRACKET;}

[\=]                        {return ASSIGMENT;}
[\;]                        {return EOL;}
{ID}                        {
                                yylval._string = malloc(strlen(yytext) + 1);
                                strcpy(yylval._string, yytext);
                                return IDENT;
                            }

{INTVAL}                    {
                                yylval._int = atoi(yytext);
                                return INTEGER;
                            }

{FLOATVAL}                  {
                                yylval._double = atof(yytext);
                                return FLOAT;
                            }

\"                          {
                                string_buf_ptr = string_buf;
                                BEGIN(str);
                            }
<str>[^\"]                  {
                                *string_buf_ptr++ = yytext[0];
                            }
<str>\"                     {
                                BEGIN(INITIAL);
                                *string_buf_ptr = '\0';
                                yylval._string = malloc(strlen(string_buf) + 1);
                                strcpy(yylval._string, string_buf);
                                return STRING;
                            }

[\s\t\n]                    {;}

%%