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%%	options

%%	header

#ifdef __cplusplus
extern "C" {
#endif

/**	Convert input line into key value pairs.
	@param	kvp	Array of key value structures for results.
	@param	szp	Size of array (in), used elements (out).
	@param	il	Input line to process.
	@param	app	Application structure for diagnostics, may be NULL.
	@return	1 on success (number of elements in sz), 0 on error.
*/
int
dk3str_to_key_value(
  dk3_key_value_t	*kvp,
  size_t		*szp,
  dkChar		*il,
  dk3_app_t		*app
);

#ifdef __cplusplus
}
#endif



%%	state machine

[options]
		name		=	dk3strkv_stm
		write header	=	no
[states]
		ST_START		# Waiting for anything to happen
		ST_KEY		# In a key
		ST_EXPECT	# Expect value
		ST_VALUE		# Having value
		ST_SQ_EXPECT	# Expect single quoted value
		ST_DQ_EXPECT	# Expect double quoted value
		ST_SQ_VALUE	# Having single quoted value
		ST_DQ_VALUE	# Having double quoted value
		ST_ERROR		# Error occured
[inputs]
		I_OT		# Any other character
		I_WH		# White space
		I_SQ		# Single quote
		I_DQ		# Double quote
		I_BS		# Backslash
		I_EQ		# Equal sign
[output]
		O_ERROR		# Error occured
		O_NO		# Do nothing
		O_SQ		# Squeeze
		O_SKEY		# Start key
		O_ENDKEY	# End key string (change to finalizer)
		O_ENDCOUNT	# End key string and count upwards
		O_ENDVAL	# End value string (change to finalizer)
		O_SVAL		# Start value
		O_SQ_SVAL	# Squeeze and start value
		O_SEVAL		# Start and end value
[rules]
		*		*		ST_ERROR	O_ERROR

		ST_START	I_WH		ST_START	O_NO
		ST_START	I_OT		ST_KEY		O_SKEY

		ST_KEY		*		ST_KEY		O_NO
		ST_KEY		I_WH		ST_START	O_ENDCOUNT
		ST_KEY		I_EQ		ST_EXPECT	O_ENDKEY

		ST_EXPECT	I_WH		ST_EXPECT	O_NO
		ST_EXPECT	*		ST_VALUE	O_SVAL
		ST_EXPECT	I_BS		ST_VALUE	O_SQ_SVAL
		ST_EXPECT	I_SQ		ST_SQ_EXPECT	O_NO
		ST_EXPECT	I_DQ		ST_DQ_EXPECT	O_NO

		ST_VALUE	*		ST_VALUE	O_NO
		ST_VALUE	I_BS		ST_VALUE	O_SQ
		ST_VALUE	I_WH		ST_START	O_ENDVAL

		ST_SQ_EXPECT	*		ST_SQ_VALUE	O_SVAL
		ST_SQ_EXPECT	I_BS		ST_SQ_VALUE	O_SQ_SVAL
		ST_SQ_EXPECT	I_SQ		ST_START	O_SEVAL

		ST_SQ_VALUE	*		ST_SQ_VALUE	O_NO
		ST_SQ_VALUE	I_SQ		ST_START	O_ENDVAL
		ST_SQ_VALUE	I_BS		ST_SQ_VALUE	O_SQ

		ST_DQ_EXPECT	*		ST_DQ_VALUE	O_SVAL
		ST_DQ_EXPECT	I_BS		ST_DQ_VALUE	O_SQ_SVAL
		ST_DQ_EXPECT	I_DQ		ST_START	O_SEVAL

		ST_DQ_VALUE	*		ST_DQ_VALUE	O_NO
		ST_DQ_VALUE	I_BS		ST_DQ_VALUE	O_SQ
		ST_DQ_VALUE	I_DQ		ST_START	O_ENDVAL

%%	module


#include "dk3all.h"
#include "dk3strkv.h"



/**	Classify input character
	@param	c	Character to classify.
	@return	Character class.
*/
static
int
dk3strkv_classify(dkChar c)
{
  int		 back = I_OT;
  $? "+ dk3strkv_classify %d", (int)c
  switch(c) {
    case dkT(' '): case dkT('\t'): {
      back = I_WH;
    } break;
    case dkT('"'): {
      back = I_DQ;
    } break;
    case dkT('\''): {
      back = I_SQ;
    } break;
    case dkT('\\'): {
      back = I_BS;
    } break;
    case dkT('='): {
      back = I_EQ;
    } break;
  } $? "- dk3strkv_classify %d", back
  return back;
}



/**	Empty line.
*/
static dkChar const dk3strkv_empty_line[] = { dkT("") };



/**	Report error for unexpected end of text.
	@param	app	Application structure for diagnostics, may be NULL.
	@param	il	Input line to complain about.
*/
static
void
dk3strkv_error_unexpected_eot(dk3_app_t *app, dkChar *il)
{
  dkChar const 	*ptr;
  if(app) {
    ptr = il;
    if(!(ptr)) { ptr = dk3strkv_empty_line; }
    dk3app_log_i3(app, DK3_LL_ERROR, 389, 390, ptr);
  }
}



/**	Report error, too many key value items.
	@param	app	Application structure for diagnostics, may be NULL.
	@param	il	Input line to complain about.
	@param	pos	Position in line.
*/
static
void
dk3strkv_error_too_many(dk3_app_t *app, dkChar *il, unsigned long pos)
{
  dkChar		buffer[64];
  dkChar const		*ptr;
  if(app) {
    ptr = il;
    if(!(ptr)) { ptr = dk3strkv_empty_line; }
#if VERSION_BEFORE_20140716
    dk3sf_sprintf3(buffer, dkT("%lu"), pos);
    dk3app_log_i5(app, DK3_LL_ERROR, 386, 387, 388, buffer, ptr);
#else
    if (dk3ma_um_to_string(buffer, DK3_SIZEOF(buffer, dkChar), (dk3_um_t)pos)) {
      dk3app_log_i5(app, DK3_LL_ERROR, 386, 387, 388, buffer, ptr);
    }
#endif
  }
}




int
dk3str_to_key_value(
  dk3_key_value_t	*kvp,
  size_t		*szp,
  dkChar		*il,
  dk3_app_t		*app
)
{
  dkChar		*ptr;		/* Traverse string. */
  dkChar		*mycopy;	/* Private copy for diagnostics. */
  unsigned long		 charno;	/* Character number. */
  size_t		 i;		/* Current key value pair index. */
  int			 icl;		/* Input class. */
  int			 act;		/* Action to take. */
  int			 stm;		/* State machine. */
  int			 cc;		/* Flag: Can continue. */
  int			 rtm	= 0;	/* Reported too many. */
  int			 error	= 0;	/* Flag: Have error. */
  int			 back	= 0;
  $? "+ dk3str_to_key_value \"%!ds\"", il
  if((kvp) && (szp)) {
    for(i = 0; i < *szp; i++) { kvp[i].key = NULL; kvp[i].val = NULL; }
  }
  if((kvp) && (szp) && (il)) {
    if(*szp) {
      mycopy = dk3str_dup_app(il, app);
      i = 0;
      ptr = il; cc = 1; charno = 1UL;
      dk3strkv_stm_reset(&stm);
      while(cc) {
        if(*ptr) {	$? ". begin of loop \"%!ds\"", ptr
	  icl = dk3strkv_classify(*ptr);	$? ". icl = %d", icl
	  act = dk3strkv_stm_step(&stm, icl);	$? ". act = %d", act
	  switch(act) {
	    case O_ERROR: {		$? ". error"
	      error = 1;
	    } break;
	    case O_SQ: {		$? ". O_SQ"
	      dk3str_cpy(ptr, &(ptr[1]));
	      if(*ptr) {
	        charno++;
	      } else {
	        cc = 0;
		error = 1;
		dk3strkv_error_unexpected_eot(app, mycopy);
	      }
	    } break;
	    case O_SKEY: {		$? ". O_SKEY"
	      if(i < (*szp)) {
	        kvp[i].key = ptr;
	      } else {
	        error = 1;
		if(0 == rtm) {
		  rtm = 1;
		  dk3strkv_error_too_many(app, mycopy, charno);
		}
	      }
	    } break;
	    case O_ENDKEY: {		$? ". O_ENDKEY"
	      *ptr = dkT('\0');
	    } break;
	    case O_ENDCOUNT: {		$? ". O_ENDCOUNT"
	      *ptr = dkT('\0');
	      i++;
	    } break;
	    case O_ENDVAL: {		$? ". O_ENDVAL"
	      *ptr = dkT('\0');
	      i++;
	    } break;
	    case O_SVAL: {		$? ". O_SVAL"
	      if(i < (*szp)) {
	        kvp[i].val = ptr;
	      } else {
	        error = 1;
		if(0 == rtm) {
		  rtm = 1;
		  dk3strkv_error_too_many(app, mycopy, charno);
		}
	      }
	    } break;
	    case O_SQ_SVAL: {		$? ". O_SQ_SVAL"
	      dk3str_cpy(ptr, &(ptr[1]));
	      if(*ptr) {
	        charno++;
	        if(i < (*szp)) {
		  kvp[i].val = ptr;
		} else {
		  error = 1;
		  if(0 == rtm) {
		    rtm = 1;
		    dk3strkv_error_too_many(app, mycopy, charno);
		  }
		}
	      } else {
	        cc = 0;
		error = 1;
		dk3strkv_error_unexpected_eot(app, mycopy);
	      }
	    } break;
	    case O_SEVAL: {		$? ". O_SEVAL"
	      *ptr = dkT('\0');
	      if(i < (*szp)) {
	        kvp[i].val = ptr;
		i++;
	      } else {
	        error = 1;
		if(0 == rtm) {
		  rtm = 1;
		  dk3strkv_error_too_many(app, mycopy, charno);
		}
	      }
	    } break;
	  }
	  ptr++;
	  charno++;
	} else {
	  cc = 0;
	}
      }
      switch(stm) {
        case ST_START: {	$? ". nothing to finish"
	  if(0 == error) {
	    back = 1;
	    *szp = i;
	  }
	} break;
	case ST_KEY: {	$? ". finish key"
	  if(0 == error) {
	    i++;
	    back = 1;
	    *szp = i;
	  }
	} break;
	case ST_VALUE: {	$? ". finish value"
	  if(0 == error) {
	    i++;
	    back = 1;
	    *szp = i;
	  }
	} break;
      }
      dk3_release(mycopy);
    }
  } else {
    if((kvp) && (szp) && (!(il))) {
      *szp = 0;
      back = 1;
    }
  } $? "- dk3str_to_key_value %d", back
  return back;
}