#include <stdio.h>
#include <stdlib.h>

#include "eo_tokenizer.h"

static void
_eo_tokenizer_abort(Eo_Tokenizer *toknz,
                    const char *file, const char* fct, int line,
                    const char *fmt, ...)
{
   va_list ap;
   va_start (ap, fmt);
   eina_log_vprint(_eo_tokenizer_log_dom, EINA_LOG_LEVEL_ERR,
                   file, fct, line, fmt, ap);
   va_end(ap);
   fprintf(stderr, " toknz[%d] n:%d l:%d p:%d pe:%d ts:%d te:%d act:%d\n",
          toknz->cs, toknz->current_nesting, toknz->current_line,
          (toknz->p - toknz->buf), (toknz->pe - toknz->buf),
          toknz->ts, toknz->te, toknz->act);
   exit(EXIT_FAILURE);
}
#define ABORT(toknz, ...) \
   _eo_tokenizer_abort(toknz, __FILE__, __FUNCTION__, __LINE__, __VA_ARGS__);

static const char*
_eo_tokenizer_token_get(Eo_Tokenizer *toknz, char *p)
{
   if (toknz->saved.tok == NULL) ABORT(toknz, "toknz->saved.tok is NULL");
   int l = (p - toknz->saved.tok);
   char d[BUFSIZE];
   memcpy(d, toknz->saved.tok, l);
   d[l] = '\0';
   toknz->saved.tok = NULL;
   DBG("token : >%s<", d);
   return eina_stringshare_add(d);
}

static Eo_Class_Def*
_eo_tokenizer_class_get(Eo_Tokenizer *toknz, char *p)
{
   Eo_Class_Def *kls = calloc(1, sizeof(Eo_Class_Def));
   if (kls == NULL) ABORT(toknz, "calloc Eo_Class_Def failure");

   kls->name = _eo_tokenizer_token_get(toknz, p);

   return kls;
}

%%{
   machine common;

   access toknz->;
   variable p toknz->p;
   variable pe toknz->pe;
   variable eof toknz->eof;

   action inc_line {
      toknz->current_line += 1;
      DBG("inc[%d] %d", toknz->cs, toknz->current_line);
   }

   action save_line {
      toknz->saved.line = toknz->current_line;
      DBG("save line[%d] %d", toknz->cs, toknz->current_line);
   }

   action save_fpc {
      toknz->saved.tok = fpc;
      DBG("save token[%d] %p %c", toknz->cs, fpc, *fpc);
   }

   action show_comment {
      DBG("comment[%d] line%03d:%03d", toknz->cs,
          toknz->saved.line, toknz->current_line);
   }

   action show_ignore {
      DBG("ignore[%d] line:%d", toknz->cs, toknz->current_line);
   }

   action show_error {
      DBG("error[%d]", toknz->cs);
      char *s, *d;
      char buf[BUFSIZE];
      for (s = fpc, d = buf; (s <= toknz->pe); s++)
        {
           if ((*s == '\r') || (*s == '\n'))
             break;
           *d++ = *s;
        }
      *d = '\0';
      ERR("error nesting:%d line:%d : %s",
          toknz->current_nesting, toknz->current_line, buf);
      toknz->cs = eo_tokenizer_error;
      fbreak;  /* necessary to stop scanners */
   }

   cr                = '\n';
   cr_neg            = [^\n];
   ws                = [ \t\r];
   newline           = cr @inc_line;
   ignore            = (0x00..0x20 - cr)+ newline?;

   alnum_u           = alnum | '_';
   alpha_u           = alpha | '_';
   ident             = alpha+ >save_fpc (alnum | '_' )+;

   eo_comment        = "/*@" ignore* alnum_u >save_fpc ( any | '\n' @inc_line )* :>> "*/";
   c_comment         = "/*" ( any | '\n' @inc_line )* :>> "*/";
   cpp_comment       = "//" (any - cr)* newline;
   comment           = ( c_comment | cpp_comment ) > save_line;

   end_statement     = ';';
   begin_def         = '{';
   end_def           = '}' end_statement;
   begin_list        = '(';
   end_list          = ')';
   list_separator    = ',';

}%%

%%{
   machine eo_tokenizer;
   include common;

   write data;

###### TOKENIZE CLASS

   action end_class_comment {
      if (toknz->tmp.kls->comment != NULL)
        ABORT(toknz, "class %s has already a comment", toknz->tmp.kls->name);
      toknz->tmp.kls->comment = _eo_tokenizer_token_get(toknz, fpc-1);
   }

   action end_inherit_name {
      const char *base = _eo_tokenizer_token_get(toknz, fpc);
      toknz->tmp.kls->inherits = eina_list_append(toknz->tmp.kls->inherits, base);
   }

   action begin_properties {
      INF("  begin properties");
      toknz->current_nesting++;
      /* fgoto tokenize_properties; */
   }

   action begin_methods {
      INF("  begin methods");
      toknz->current_nesting++;
      /* fgoto tokenize_methods; */
   }

   action end_class {
      INF("end class: %s", toknz->tmp.kls->name);
      toknz->classes = eina_list_append(toknz->classes, toknz->tmp.kls);
      toknz->tmp.kls = NULL;
      toknz->current_nesting--;
      fgoto main;
   }

   inherit_item = ident %end_inherit_name ignore*;
   inherit_item_next = list_separator ignore* inherit_item;
   inherits = 'inherits' ignore* begin_def ignore* (inherit_item inherit_item_next*)? end_def;

   properties = 'properties' ignore* begin_def;
   methods = 'methods' ignore* begin_def;

   tokenize_class := |*
      ignore+;    #=> show_ignore;
      eo_comment  => end_class_comment;
      comment     => show_comment;
      inherits;
      properties  => begin_properties;
      methods     => begin_methods;
      end_def     => end_class;
      any         => show_error;
      *|;

###### TOP LEVEL

   action begin_class {
      INF("begin class: %s", toknz->tmp.kls->name);
      toknz->current_nesting++;
      fgoto tokenize_class;
   }

   action end_class_name {
      if (toknz->tmp.kls != NULL)
        ABORT(toknz, "there is a pending class definition %s", toknz->tmp.kls->name);
      toknz->tmp.kls = _eo_tokenizer_class_get(toknz, fpc);
   }

   begin_class = ident %end_class_name ignore* begin_def;

   main := |*
      ignore+;    #=> show_ignore;
      comment     => show_comment;
      begin_class => begin_class;
      any         => show_error;
   *|;

}%%

Eina_Bool
eo_tokenizer_walk(Eo_Tokenizer *toknz, const char *source)
{
   INF("tokenize %s...", source);
   toknz->source = eina_stringshare_add(source);

   FILE *stream;

   int done = 0;
   int have = 0;
   int offset = 0;

   stream = fopen(toknz->source, "r");
   if (!stream)
     {
        ERR("unable to read in %s", toknz->source);
        return EINA_FALSE;
     }

   %% write init;

   while (!done)
     {
        int len;
        int space;

        toknz->p = toknz->buf + have;
        space = BUFSIZE - have;

        if (space == 0)
          {
             fclose(stream);
             ABORT(toknz, "out of buffer space");
          }

        len = fread(toknz->p, 1, space, stream);
        if (len == 0) break;
        toknz->pe = toknz->p + len;

        if (len < space)
          {
             toknz->eof = toknz->pe;
             done = 1;
          }

        %% write exec;

        if ( toknz->cs == %%{ write error; }%% )
          {
             ERR("wrong termination");
             break;
          }

        if ( toknz->ts == 0 )
          have = 0;
        else
          {
             DBG("move data and pointers before buffer feed");
             have = toknz->pe - toknz->ts;
             offset = toknz->ts - toknz->buf;
             memmove(toknz->buf, toknz->ts, have);
             toknz->te -= offset;
             toknz->ts = toknz->buf;
          }

        if (toknz->saved.tok != NULL)
          {
             if ((have == 0) || ((toknz->saved.tok - offset) < toknz->buf))
               {
                  WRN("reset lost saved token %p", toknz->saved.tok);
                  toknz->saved.tok = NULL;
               }
             else
               toknz->saved.tok -= offset;
          }
     }

   fclose(stream);

   return EINA_TRUE;
}

Eo_Tokenizer*
eo_tokenizer_get(void)
{
   Eo_Tokenizer *toknz = calloc(1, sizeof(Eo_Tokenizer));
   if (!toknz) return NULL;

   toknz->ts = NULL;
   toknz->te = NULL;
   /* toknz->top = 0; */
   toknz->source = NULL;
   toknz->max_nesting = 10;
   toknz->current_line = 1;
   toknz->current_nesting = 0;
   toknz->saved.tok = NULL;
   toknz->saved.line = 0;
   toknz->classes = NULL;

   return toknz;
}

void
eo_tokenizer_dump(Eo_Tokenizer *toknz)
{
   const char *s;
   Eina_List *k, *l;
   Eo_Class_Def *kls;

   EINA_LIST_FOREACH(toknz->classes, k, kls)
     {
        printf("Class: %s (%s)\n",
               kls->name, (kls->comment ? kls->comment : "-"));
        printf("  inherits from :");
        EINA_LIST_FOREACH(kls->inherits, l, s)
           printf(" %s", s);
        printf("\n");
     }

}

static void
_eo_tokenizer_ret_free(Eo_Ret_Def *ret)
{
   if (ret->type) eina_stringshare_del(ret->type);
   if (ret->comment) eina_stringshare_del(ret->comment);
   /* do not free */
}

static void
_eo_tokenizer_param_free(Eo_Param_Def *param)
{
   if (param->type) eina_stringshare_del(param->type);
   if (param->name) eina_stringshare_del(param->name);
   if (param->comment) eina_stringshare_del(param->comment);
   free(param);
}

static void
_eo_tokenizer_accessor_free(Eo_Accessor_Def *accessor)
{
   const char *s;
   Eina_List *l;

   if (accessor->comment)
     eina_stringshare_del(accessor->comment);

   EINA_LIST_FOREACH(accessor->legacies, l, s)
      if (s) eina_stringshare_del(s);

   _eo_tokenizer_ret_free(&accessor->ret);

   free(accessor);
}

static void
_eo_tokenizer_property_def_free(Eo_Property_Def *prop)
{
   Eo_Param_Def *param;
   Eo_Accessor_Def *accessor;

   if (prop->name)
     eina_stringshare_del(prop->name);

   EINA_LIST_FREE(prop->params, param)
      _eo_tokenizer_param_free(param);

   EINA_LIST_FREE(prop->accessors, accessor)
      _eo_tokenizer_accessor_free(accessor);

   free(prop);
}

static void
_eo_tokenizer_method_def_free(Eo_Method_Def *meth)
{
   Eo_Param_Def *param;

   _eo_tokenizer_ret_free(&meth->ret);

   if (meth->name)
     eina_stringshare_del(meth->name);
   if (meth->comment)
     eina_stringshare_del(meth->comment);

   EINA_LIST_FREE(meth->params, param)
      _eo_tokenizer_param_free(param);

   free(meth);
}

static void
_eo_tokenizer_class_def_free(Eo_Class_Def *kls)
{
   const char *s;
   Eina_List *l;
   Eo_Property_Def *prop;
   Eo_Method_Def *meth;

   if (kls->name)
     eina_stringshare_del(kls->name);
   if (kls->comment)
     eina_stringshare_del(kls->comment);

   EINA_LIST_FOREACH(kls->inherits, l, s)
      if (s) eina_stringshare_del(s);

   EINA_LIST_FREE(kls->properties, prop)
      _eo_tokenizer_property_def_free(prop);

   EINA_LIST_FREE(kls->methods, meth)
      _eo_tokenizer_method_def_free(meth);

   free(kls);
}

void
eo_tokenizer_free(Eo_Tokenizer *toknz)
{
   Eo_Class_Def *kls;

   if (toknz->source)
     eina_stringshare_del(toknz->source);

   EINA_LIST_FREE(toknz->classes, kls)
      _eo_tokenizer_class_def_free(kls);

   free(toknz);
}