/*
 *  STRTOCLR.C - read color (for color command and other)
 *
 *
 *  History:
 *
 *    07-Oct-1999 (Paolo Pantaleo)
 *        Started.
 *
 *
 */

/*only
BOOL StringToColor(LPWORD lpColor, LPTSTR*str)
is to be called
other are internal service functions*/


#include "cmd.h"

#include <ctype.h>
#include <tchar.h>


#define _B FOREGROUND_BLUE
#define _G FOREGROUND_GREEN
#define _R FOREGROUND_RED
#define _I FOREGROUND_INTENSITY


/*return values for chop_blank*/
#define CP_OK				0
#define CP_BLANK_NOT_FOUND	1
#define CP_END_OF_STRING	2

#define SC_HEX 0x0100
#define SC_TXT 0x0200



typedef struct _CLRTABLE
{
	LPTSTR		name;
	WORD		val;
} CLRTABLE;


CLRTABLE clrtable[] =
{
	{"bla"	,0			},
	{"blu"	,_B			},
	{"gre"	,_G			},
	{"cya"	,_B|_G		},
	{"red"	,_R			},
	{"mag"	,_B|_R		},
	{"yel"	,_R|_G		},
	{"whi"	,_R|_G|_B	},
	{"gra"	,_I			},

	
	{"0"	,0			},
	{"2"	,_G			},
	{"3"	,_B|_G		},
	{"4"	,_R			},
	{"5"	,_B|_R		},
	{"6"	,_R|_G		},
	{"7"	,_R|_G|_B	},

	{"8"	,_I			},
	{"9"	,_I|_B		},
	{"10"	,_I|_G		},
	{"11"	,_I|_B|_G	},
	{"12"	,_I|_R		},
	{"13"	,_I|_B|_R	},
	{"14"	,_I|_R|_G	},
	{"15"	,_I|_R|_G|_B},

	
	/* note that 1 is at the end of list
	to avoid to confuse it with 10-15*/
	{"1"	,_B			},

	/*cyan synonimous*/
	{"aqu"	,_B|_G		},
	/*magenta synonimous*/
	{"pur"	,_B|_R		},

	
	{""   ,0},
};



/*
move string pointer to next word (skip all spaces)
on erro retunr nonzero value
*/
static
INT chop_blank(LPTSTR *arg_str)
{
	
	LPTSTR str;
	str = _tcschr(*arg_str,_T(' '));
	if(!str)
	{
		str = _tcschr (*arg_str, _T('\0'));
		if(str != NULL)
			*arg_str=str;
		return CP_BLANK_NOT_FOUND;
	}

	

	while(_istspace(*str))
		str++;

	if (*str == _T('\0'))
	{
		*arg_str=str;
		return CP_END_OF_STRING;
	}

	*arg_str = str;

	return CP_OK;	
}



/*
read a color value in hex (like win nt's cmd syntax)
if an error occurs return -1	
*/ 
static
WORD hex_clr(LPTSTR str)
{
	WORD ret= (WORD)-1;
	TCHAR ch;
	
	ch = str[1];
	
	if(_istdigit(ch))
		ret = ch-_T('0');
	else
	{	
		ch=_totupper(ch);

		if(  ch >= _T('A') && ch <= _T('F')  )
			ret = ch-_T('A')+10;
		else
			return (WORD)-1;
	}

	
	ch = str[0];
	
	if(_istdigit(ch))
		ret |= (ch-_T('0')) << 4;
	else
	{	
		ch=_totupper(ch);

		if(  ch >= _T('A') && ch <= _T('F')  )
			ret |= (ch-_T('A')+10) <<4;
		else
			return (WORD)-1;
	}

	return ret;
}


/*
read a color value from a string (like 4nt's syntax)
if an error occurs return -1	
*/
static
WORD txt_clr(LPTSTR str)
{
	INT i;
	
	for(i=0;*(clrtable[i].name);i++)
		if(	_tcsnicmp(str,clrtable[i].name,_tcslen(clrtable[i].name)) == 0)			
			return clrtable[i].val;
	
	return (WORD)-1;
}



/*search for x on y*/ 
static
WORD str_to_color(LPTSTR* arg_str)
{
	LPTSTR str;	
	BOOL bBri;

	WORD tmp_clr,ret_clr;

	str = *arg_str;


	
	if(!(*str))
		return (WORD)-1;


	/*foreground*/
        bBri = FALSE;

	if(_tcsnicmp(str,"bri",3) == 0 )
	{
		bBri = TRUE;

		if(chop_blank(&str))
			return (WORD)-1;
	}

	if( (tmp_clr = txt_clr(str)) == (WORD)-1 )
	{
		return (WORD)-1;
	}

	/*skip spaces and "on"*/	
	if ( chop_blank(&str) || chop_blank(&str) )
		return (WORD)-1;

	ret_clr = tmp_clr | (bBri << 3);

	/*background*/
	bBri = FALSE;

	if(_tcsnicmp(str,"bri",3) == 0 )
	{
		bBri = TRUE;

		if(chop_blank(&str))
			return (WORD)-1;
	}
		
	
	if( (tmp_clr = txt_clr(str)) == (WORD)-1 )
		return (WORD)-1;

	chop_blank(&str);
	
	*arg_str = str;

	return SC_HEX | ret_clr | tmp_clr << 4 | bBri << 7;
}



/****main function****/
/*
the only parameter is arg_str, a pointer to a string.
the string is modified so it will begin to first word after
color specification
(only the char* is moved, no chars in the string are modfied)


it returns the color in the l.o. byte, plus two flags in the
h.o. byte, they are:
SC_HEX win nt's cmd syntax (for exampl a0)
SC_TXT 4nt's syntax ( "bri gre on bla" or "10 on 0")

if succedes also move the LPTSTR to end of
string that specify color
*/


BOOL StringToColor(LPWORD lpColor, LPTSTR*str)
{
	WORD wRet;

	wRet = str_to_color (str);
	if (wRet == (WORD)-1)
	{
		wRet=hex_clr (*str);
		chop_blank (str);
		if (wRet == (WORD)-1)
			return FALSE;
	}

	*lpColor = wRet;

	return TRUE;
}

/* EOF */
