/*
**		BRIEF -- Basic Reconfigurable Interactive Editing Facility
**
**		Written by Dave Nanian and Michael Strickman.
*/

/*
**		search.cb:
**
**		This file contains all of the standard BRIEF macros for search
**	and translate.
*/

/*
**		search:
**
**		This macro defines the global variables needed by the search and
**	translate macros.
*/

#define	FORWARD	1						//	Value used to search FORWARD.
#define	BACKWARD	0						//	Value used to search BACKWARD.

#define	TRUE		1						//	Standard definitions of TRUE & FALSE.
#define	FALSE		0

#define	MARKSRCH_TIMEOUT	5			//	Timeout for marked location.

extern int	_dir,							//	Current/last search direction.
				_t_dir,						//	Current/last translate direction.
				_reg_exp,					//	Regular expressions on/off.
				_block_search,				//	Block search on/off.
				_package_buf;				//	Parsed language package information.

extern string	_s_pat,					//	Current/last search pattern.
					_t_pat,					//	Current/last translate pattern.
					_r_pat;					//	Current/last replacement pattern.

string	_nw_macro,						//	Current next_word macro.
			_pw_macro,						//	Current previous_word macro.
			_ew_macro,						// Current begin_word macro.
			_bw_macro;						// Current end_word macro.

string _evaluate_package (string extension, string macro_name);
void _marksrch (int match_length, ~string);

int	_marksrch_active;					//	Flag to tell _invalid_key we're active.

/*
**		_on:
**
**		This simple generic package resets the _nw_macro and _pw_macro variables
**	when we switch buffers and BPACKAGE parsing is active.
*/

string _on ()
{
	returns (_nw_macro = _pw_macro = _ew_macro = _bw_macro = "");
}

/*
**		next_word, _next_word:
**
**		Locates the next word in the file using a regular expression.	If
**	there are no following words in the file, the cursor does not move.
*/

int next_word ()
{
	if (_nw_macro != "")
		returns (execute_macro (_nw_macro));
	else
		{
		string	extension;

		inq_names (NULL, extension);

		if (!_package_buf)
			{
			extension = "." + extension + "_next_word";
			returns (execute_macro (inq_macro (extension) ? extension : "_next_word"));
			}
		else
			returns (execute_macro (_nw_macro = _evaluate_package (extension, "_next_word")));
		}
}

int _next_word ()
{
	returns (search_fwd ("[ \t\x0c\n]\\c[~ \t\x0c\n]"));
}

/*
**		previous_word, _previous_word:
**
**		Locates the previous word in the file using a regular expression.  If
**	there are no preceding words in the file, the cursor does not move.
*/

int previous_word ()
{
	if (_pw_macro != "")
		returns (execute_macro (_pw_macro));
	else
		{
		string	extension;

		inq_names (NULL, extension);

		if (!_package_buf)
			{
			extension = "." + extension + "_previous_word";
			returns (execute_macro (inq_macro (extension) ? extension : "_previous_word"));
			}
		else
			returns (execute_macro (_pw_macro = _evaluate_package (extension, "_previous_word")));
		}
}

int _previous_word ()
{
	if (prev_char ())
		returns (search_back ("{[~ \t\x0c\n]+}|{[ \t\x0c\n]+}[ \t\x0c\n]@", -2));
	else
		returns (0);
}

/*
**		.c_next_word, .c_previous_word, .cb_next_word, .cb_previous_word,
**		.h_next_word, .h_previous_word, .inc_next_word, .inc_previous_word,
**		.m_next_word, .m_previous_word, .asm_next_word, .asm_previous_word:
**
**		These definitions are used as "language sensitive" word patterns
**	for C, Assembler and the BRIEF macro languages.
*/

int .c_next_word ()
{
	int	length;

	save_position ();

	if (length = search_fwd ("{[a-zA-Z0-9_]+}|{[~ \t\x0c\na-zA-Z0-9_]+}|{[ \t\x0c\n]+}[ \t\x0c\n]@", -2))
		{
		int	at_end_of_line;

		next_char (--length);
		at_end_of_line = (read (1) == "\n");
		restore_position (at_end_of_line);
		returns (!at_end_of_line);
		}
	else
		{
		restore_position ();
		returns (0);
		}
}

int .c_previous_word ()
{
	if (prev_char ())
		returns (search_back ("{[a-zA-Z0-9_]+}|{[~ \t\x0c\na-zA-Z0-9_]+}[ \t\x0c\n]@", -2));
	else
		returns (0);
}

int .cb_next_word ()
{
	returns (.c_next_word ());
}

int .cb_previous_word ()
{
	returns (.c_previous_word ());
}

int .h_next_word ()
{
	returns (.c_next_word ());
}

int .h_previous_word ()
{
	returns (.c_previous_word ());
}

int .inc_next_word ()
{
	returns (.c_next_word ());
}

int .inc_previous_word ()
{
	returns (.c_previous_word ());
}

int .m_next_word ()
{
	returns (.c_next_word ());
}

int .m_previous_word ()
{
	returns (.c_previous_word ());
}

int .asm_next_word ()
{
	returns (.c_next_word ());
}

int .asm_previous_word ()
{
	returns (.c_previous_word ());
}

/*
**		search_fwd:
**
**		This macro is used to search forward in the buffer from the
**	keyboard level.  If there is a previously defined pattern, it is
**	displayed on the command line.  Typing any character makes this pattern
**	vanish and the new one will take its place.	If Esc is typed, the old
**	pattern is retained.
*/

replacement int search_fwd (~string, ~int, ~int, ~int)
{
	/*
	**		If we're not being called from the keyboard, we don't want
	**	to extend the search command at all.
	*/

	if (inq_called () != "")
		returns (search_fwd ());
	else
		{
		/*
		**		We set the message level to 0 so that the user can see
		**	the messages that the search command displays.
		*/

		int	old_msg_level = set_msg_level (0),
				ret_code;

		string	prompt;

		/*
		**		It's nice to be able to see the setting of the regular
		**	expression toggle in the search string.  We check to see
		**	what it is, and change the search prompt accordingly.
		*/

		sprintf (prompt, " Search %sfor: ", _reg_exp ? "" : "(RE off) ");

		if (get_parm (0, _s_pat, prompt, NULL, _s_pat))
			{
			_dir = FORWARD;

			/*
			**		Finally, we search for the specified pattern, using
			**	the current regular expression setting.  Since we've
			**	given the pattern in the function call, the user is
			**	not prompted.
			*/

			if ((ret_code = search_fwd (_s_pat, _reg_exp, NULL, _block_search)) > 0)
				_marksrch (ret_code, "search_fwd");
			}
		else
			ret_code = -1;

		set_msg_level (old_msg_level);
		returns (ret_code);
		}
}

/*
**		search_back:
**
**		This macro is used to search backward in the buffer from the
**	keyboard level.  If there is a previously defined pattern, it is
**	displayed on the command line.  Typing any character makes this pattern
**	vanish and the new one will take its place.	If Esc is typed, the old
**	pattern is retained.
*/

replacement int search_back (~string, ~int, ~int, ~int)
{
	/*
	**		If we're not being called from the keyboard, we don't want
	**	to extend the search command at all.
	*/

	if (inq_called () != "")
		returns (search_back ());
	else
		{
		/*
		**		We set the message level to 0 so that the user can see
		**	the messages that the search command displays.
		*/

		int	old_msg_level = set_msg_level (0),
				ret_code;

		string	prompt;

		/*
		**		It's nice to be able to see the setting of the regular
		**	expression toggle in the search string.  We check to see
		**	what it is, and change the search prompt accordingly.
		*/

		sprintf (prompt, " Search %sfor: ", _reg_exp ? "" : "(RE off) ");

		/*
		**		Here we retrieve the search pattern for the user.	Note
		**	that we pass the previous search pattern (which is stored in
		**	the global variable _s_pat) to _get_default as a default prompt
		**	response.
		*/

		if (get_parm (0, _s_pat, prompt, NULL, _s_pat))
			{
			_dir = BACKWARD;

			/*
			**		Finally, we search for the specified pattern, using
			**	the current regular expression setting.  Since we've
			**	given the pattern in the function call, the user is
			**	not prompted.
			*/

			if ((ret_code = search_back (_s_pat, _reg_exp, NULL, _block_search)) > 0)
				_marksrch (ret_code, "search_back");
			}
		else
			ret_code = -1;

		set_msg_level (old_msg_level);
		returns (ret_code);
		}
}

/*
**		search_again:
**
**		This macro uses the information provided by search_fwd and search_back
**	to search for the same pattern again, in the same direction.
*/

int search_again ()
{
	/*
	**		We set the message level to 0 so that the user can see
	**	the messages that the search commands display.
	*/

	int	ret_code,
			old_msg_level = set_msg_level (0);

	/*
	**		We check to see if there is a previous search pattern --
	**	if not, we can't search for it.
	*/

	if (strlen (_s_pat))
		{
		/*
		**		We're searching again, so we have to move before
		**	we call the appropriate search routine.  We do this
		**	to ensure we don't find the same pattern a second
		**	time.  The current cursor location is saved on the
		**	position stack because of this:	if the search fails,
		**	we want to put the cursor back where it was before the
		**	movement.
		*/

		save_position ();

		if (_dir == BACKWARD && prev_char ())
			ret_code = search_back (_s_pat, _reg_exp, NULL, _block_search);
		else if (_dir == FORWARD && next_char ())
			ret_code = search_fwd (_s_pat, _reg_exp, NULL, _block_search);
		else
			message ("Pattern not found.");

		if (ret_code > 0)
			_marksrch (ret_code, "search_again");

		/*
		**		Restore the cursor position if the search failed.
		*/

		restore_position (!ret_code);
		}
	else
		{
		error ("No previous search pattern.");
		beep ();
		}
	set_msg_level (old_msg_level);
	returns (ret_code);
}


/*		Define a mouse event handler to exit from the process if a mouse
**	event occurs.  Save the parameters to pass on to the current handler 
**	after the process exits.
*/

void idle_mouse();

int 	do_mouse_event,
		parm1,
		parm2,
		parm3,
		parm4;

/*
**		_marksrch:
**
**		This routine accepts the return code from the search routines and
**	does marking based on that return code.  It can be replaced by the
**	user to modify the marking action.
*/

void _marksrch (int match_length, ~string)
{
	if (!inq_kbd_char ())
		{
		drop_anchor ();
		next_char (match_length - 1 - (match_length != 1));
		swap_anchor ();
		keyboard_push ();

		_marksrch_active++;
		refresh ();

		set_mouse_action( "idle_mouse" );
		do_mouse_event = 0;

		register_macro (4, "_marksrch_idle");
		process ();
		unregister_macro (4, "_marksrch_idle");
		_marksrch_active--;

		keyboard_pop ();
		raise_anchor ();

		if (do_mouse_event)
			{
			string mse_handler;
			sprintf(mse_handler, "%s %d %d %d %d", inq_mouse_action(), parm1, parm2, parm3, parm4);
			execute_macro(mse_handler);
			}
		}
}

/*		This function is called if a mouse event occurs while a pattern is
**	marked after a search. 
*/

void idle_mouse(int p1, int p2, int p3, int p4)
	{
	parm1 = p1;
	parm2 = p2;
	parm3 = p3;
	parm4 = p4;
	do_mouse_event = 1;
	exit();
	}

void _marksrch_idle ()
{
	if (MARKSRCH_TIMEOUT != 0 && inq_idle_time () >= MARKSRCH_TIMEOUT)
		exit ();
}

/*
**		_invalid_key:
**
**		This routine is called when an "invalid" key is pressed during normal
**	macro processing.  If the _marksrch_active variable isn't set, we just
**	call down to the default _invalid_key handler.  Otherwise, we exit the
**	shell process we're in, and allow the keystroke to be processed again.
*/

void _invalid_key (void)
{
	if (_marksrch_active)
		exit ();
	else
		_invalid_key ();
}

/*
**		translate_back:
**
**		This routine handles calls to translate back from the keyboard level.
*/

int translate_back (~string, ~string, ~int, ~int, ~int, ~int, ~int)
{
	returns (translate ());
}

/*
**		translate:
**
**		This routine handles calls to translate from the keyboard level,
**	making sure that the call heeds the value of the regular expression
**	toggle.	As a special bonus, BRIEF will use the value of the last
**	thing searched for as the translation pattern if no pattern is
**	entered.  Once a translate pattern is specified, the search and
**	translate patterns separate -- a pattern is maintained for each
**	operation.
*/

replacement int translate (~string, ~string, ~int, ~int, ~int, ~int, ~int)
{
	int	old_msg_level,
			ret_code,
			dir;

	string	pattern,
				default_pat,
				prompt;

	/*
	**		If we're not being called from the keyboard, we don't want
	**	to extend the search command at all.
	*/

	if (inq_called () != "")
		if (inq_called () != "translate_back")
			return (translate ());
		else
			dir = BACKWARD;
	else
		dir = FORWARD;

	old_msg_level = set_msg_level (0);

	/*
	**		It's nice to be able to see the setting of the regular
	**	expression toggle in the search string.  We check to see
	**	what it is, and change the translate prompt accordingly.
	*/

	sprintf (prompt, "%c Pattern%s: ", dir ? '' : '', _reg_exp ? "" : " (RE off)");

	/*
	**		If there haven't been any previous translate patterns,
	**	we use the last search pattern as the default response to
	**	the Pattern: prompt.  Otherwise, we use the previous
	**	translate pattern.
	*/

	if (!strlen (_t_pat))
		default_pat = _s_pat;
	else
		default_pat = _t_pat;

	if (get_parm (0, pattern, prompt, NULL, default_pat)
			&& get_parm (1, _r_pat, "Replacement: ", NULL, _r_pat))
		{
		_t_pat = pattern;
		_t_dir = dir;
		ret_code = translate (_t_pat, _r_pat, NULL, _reg_exp, NULL, inq_marked (), _t_dir);
		}
	else
		ret_code = -1;

	set_msg_level (old_msg_level);
	returns (ret_code);
}

/*
**		translate_again:
**
**		This call implements the translate_again command -- it uses the values
**	of the various global translate variables to perform the translation.
*/

int translate_again ()
{
	int	ret_code,
			old_msg_level = set_msg_level (0);

	if (strlen (_t_pat) || strlen (_r_pat))
		ret_code = translate (_t_pat, _r_pat, NULL, _reg_exp, NULL, inq_marked (), _t_dir);
	else
		{
		error ("No previous translate pattern.");
		beep ();
		}
	set_msg_level (old_msg_level);
	returns (ret_code);
}

/*
**		toggle_re:
**
**		This macro toggles the state of the regular expression global
**	variable, which controls whether regular expressions are used during
**	search and translate.
*/

int toggle_re (~int)
{
	int	ret_code,
			previous_value = _reg_exp;

	if (!(ret_code = get_parm (0, _reg_exp)))
		_reg_exp = !_reg_exp;

	if (!ret_code || inq_called () == "")
		/*
		**		This displays a message on the status line showing the
		**	new regular expression setting.	Note the use of (if) --
		**	this is the equivalent of the C ?: operator.  If the
		**	expression is true, the statement evaluates to "off";
		**	otherwise, it evaluates to "on".
		**
		**		Also note that the message is not displayed unless
		**	the macro is called from the keyboard or the command is
		**	used as a toggle.
		*/

		message ("Regular expressions %s.", _reg_exp ? "on" : "off");

	returns (previous_value);
}

/*
**		block_search:
**
**		This macro toggles the state of block searching.
*/

int block_search (~int)
{
	int	ret_code,
			previous_value = _block_search;

	if (!(ret_code = get_parm (0, _block_search)))
		_block_search = !_block_search;

	if (!ret_code || inq_called () == "")
		message ("Block searching %s.", _block_search ? "on" : "off");

	returns (previous_value);
}

/*
**		i_search:
**
**		This macro implements a simple incremental search.  It does not
**	allow regular expressions to be specified.  The Esc key terminates
**	the search.
**
**		The backspace key moves you to the previously matched pattern.
*/

void i_search ()
{
	int	char,
			level;

	string	pattern,
				character,
				assignment;

	/*
	**		We use the save_position/restore_position commands to keep
	**	track of the previously matched location.  Searching back for
	**	the identical pattern would not work, since it would match the
	**	current occurrence.	In addition, prev_char then search_back
	**	would not match if the current occurrence were the correct one.
	*/

	save_position ();

	while (TRUE)
		{
		/*
		**		Since we want the cursor to remain on the screen in the
		**	proper place, we create a "pseudo-cursor" with an IBM
		**	graphics character.
		*/

		message ("I-search for: %sÜ", pattern);

		while ((char = read_char ()) == -1);

		if (char == key_to_int ("<Esc>"))
			break;

		sprintf (character, "%s#%d", character, char);
		assignment = inq_assignment (character);

		if (assignment == "self_insert" || assignment == "nothing")
			{
			if (char == key_to_int ("<Backspace>"))
				{
				if (strlen (pattern) > 1)
					pattern = substr (pattern, 1, strlen (pattern) - 1);
				else
					pattern = "";

				restore_position ();

				if (!--level)
					{
					save_position ();
					level = 1;
					}
				}
			else
				{
				/*
				**		Now we have a character that we can search for.
				**	We add it to the string of characters, and use
				**	the search_fwd command to locate it.  While we're
				**	searching, we place an ellipsis after the
				**	string, so the user know's we're doing something.
				*/

				sprintf (character, "%c", char & 0xff);
				pattern += character;
				save_position ();
				message ("I-search for: %sÜ...", pattern);

				if (!search_fwd (pattern, FALSE))
					{
					beep ();
					restore_position ();
					pattern = substr (pattern, 1, strlen (pattern) - 1);
					}
				else
					++level;
				}
			refresh ();
			character = "";
			}
		else if (assignment != "ambiguous")
			{
			character = "";

			if (assignment == "search_again")
				{
				message ("I-search for: %sÜ...", pattern);
				save_position ();
				next_char ();

				if (!search_fwd (pattern, FALSE))
					{
					beep ();
					restore_position ();
					}
				else
					{
					refresh ();
					restore_position (FALSE);
					}
				}
			else
				beep ();
			}
		}
	/*
	**		When finished, we pop all of the saved positions off the
	**	stack.  Note the use of the "pop, don't move" parameter with
	**	
	*/

	while (--level >= 0)
		restore_position (FALSE);

	message ("I-search ended.");
}
/*
**		end_word:
**		_end_word:
**
**		Locates the end of the current word in the files using a regular
**	expression.  If there is no current word in the file, the cursor does not
** move.
*/

int end_word ()
{
	if (_ew_macro != "")
		returns (execute_macro (_ew_macro));
	else
		{
		string	extension;

		inq_names (NULL, extension);

		if (!_package_buf)
			{
			extension = "." + extension + "_end_word";
			returns (execute_macro (inq_macro (extension) ? extension : "_end_word"));
			}
		else
			returns (execute_macro (_ew_macro = _evaluate_package (extension, "_end_word")));
		}
}

int _end_word ()
{
		returns (search_fwd ("{[~ \t\x0c\n]\\c[ \t\x0c\n]}|>"));
}

/*
**		begin_word:
**		_begin_word:
**
**		Locates the beginning of the current word.
*/

int begin_word ()
{
	if (_bw_macro != "")
		returns (execute_macro (_bw_macro));
	else
		{
		string	extension;

		inq_names (NULL, extension);

		if (!_package_buf)
			{
			extension = "." + extension + "_begin_word";
			returns (execute_macro (inq_macro (extension) ? extension : "_begin_word"));
			}
		else
			returns (execute_macro (_bw_macro = _evaluate_package (extension, "_begin_word")));
		}
}

int _begin_word ()
{
		returns (search_back ("{[ \t\x0c]}|<[ \t\x0c]@\\c[~ \t\x0c]"));
}

/*
**		.c_end_word, .c_begin_word, .cb_end_word, .cb_begin_word,
**		.h_end_word, .h_begin_word, .inc_end_word, .inc_begin_word,
**		.m_end_word, .m_begin_word, .asm_end_word, .asm_begin_word:
**
**		These definitions are used as "language sensitive" word patterns
**	for C, Assembler and the BRIEF macro languages.
*/

int .c_end_word ()
{
	returns( search_fwd ("{[a-zA-Z0-9_]+}|{[~ \t\x0c\na-zA-Z0-9_]+}|{[ \t\x0c\n]+>}\\c", -2) );
}

int .c_begin_word ()
{
	returns (search_back ("{[a-zA-Z0-9_]+}|{[~ \t\x0c\na-zA-Z0-9_]+}", -2));
}
  
int .cb_end_word ()
{
	returns (.c_end_word ());
}

int .cb_begin_word ()
{
	returns (.c_begin_word ());
}

int .h_end_word ()
{
	returns (.c_end_word ());
}

int .h_begin_word ()
{
	returns (.c_begin_word ());
}

int .inc_end_word ()
{
	returns (.c_end_word ());
}

int .inc_begin_word ()
{
	returns (.c_begin_word ());
}

int .m_end_word ()
{
	returns (.c_end_word ());
}

int .m_begin_word ()
{
	returns (.c_begin_word ());
}

int .asm_end_word ()
{
	returns (.c_end_word ());
}

int .asm_begin_word ()
{
	returns (.c_begin_word ());
}