/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#)chared.c	8.1 (Berkeley) 6/4/93
 */

/*
 * chared.c: Character editor utilities
 */
#include "sys.h"

#include <stdlib.h>
#include "el.h"

/* cv_undo():
 *	Handle state for the vi undo command
 */
protected void
cv_undo(el, action, size, ptr)
    EditLine *el;
    int action, size;
    char *ptr;
{
    c_undo_t *vu = &el->el_chared.c_undo;
    vu->action = action;
    vu->ptr    = ptr;
    vu->isize  = size;
    (void) memcpy(vu->buf, vu->ptr, size);
#ifdef DEBUG_UNDO
    (void) fprintf(el->el_errfile, "Undo buffer \"%s\" size = +%d -%d\n",
		   vu->ptr, vu->isize, vu->dsize);
#endif
}


/* c_insert():
 *	Insert num characters
 */
protected void
c_insert(el, num)
    EditLine *el;
    int num;
{
    char *cp;

    if (el->el_line.lastchar + num >= el->el_line.limit)
	return;			/* can't go past end of buffer */

    if (el->el_line.cursor < el->el_line.lastchar) {
	/* if I must move chars */
	for (cp = el->el_line.lastchar; cp >= el->el_line.cursor; cp--)
	    cp[num] = *cp;
    }
    el->el_line.lastchar += num;
} /* end c_insert */


/* c_delafter():
 *	Delete num characters after the cursor
 */
protected void
c_delafter(el, num)
    EditLine *el;
    int num;
{

    if (el->el_line.cursor + num > el->el_line.lastchar)
	num = el->el_line.lastchar - el->el_line.cursor;

    if (num > 0) {
	char *cp;

	if (el->el_map.current != el->el_map.emacs)
	    cv_undo(el, INSERT, num, el->el_line.cursor);

	for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++)
	    *cp = cp[num];

	el->el_line.lastchar -= num;
    }
}


/* c_delbefore():
 *	Delete num characters before the cursor
 */
protected void
c_delbefore(el, num)
    EditLine *el;
    int num;
{

    if (el->el_line.cursor - num < el->el_line.buffer)
	num = el->el_line.cursor - el->el_line.buffer;

    if (num > 0) {
	char *cp;

	if (el->el_map.current != el->el_map.emacs)
	    cv_undo(el, INSERT, num, el->el_line.cursor - num);

	for (cp = el->el_line.cursor - num; cp <= el->el_line.lastchar; cp++)
	    *cp = cp[num];

	el->el_line.lastchar -= num;
    }
}


/* ce__isword():
 *	Return if p is part of a word according to emacs
 */
protected int
ce__isword(p)
    int p;
{
    return isalpha((unsigned char) p) || isdigit((unsigned char) p) || strchr("*?_-.[]~=", p) != NULL;
}


/* cv__isword():
 *	Return type of word for p according to vi
 */
protected int
cv__isword(p)
    int p;
{
    if (isspace((unsigned char) p))
        return 0;
    if ((unsigned char) p == '_' || isalnum((unsigned char) p))
        return 1;
    return 2;
}


/* c___isword():
 *	Return if p is part of a space-delimited word (!isspace)
 */
protected int
c___isword(p)
    int p;
{
    return !isspace((unsigned char) p);
}


/* c__prev_word():
 *	Find the previous word
 */
protected char *
c__prev_word(p, low, n, wtest)
    register char *p, *low;
    register int n;
    int (*wtest) __P((int));
{
    p--;

    while (n--) {
	while ((p >= low) && !(*wtest)((unsigned char) *p))
	    p--;
	while ((p >= low) && (*wtest)((unsigned char) *p))
	    p--;
    }

    /* cp now points to one character before the word */
    p++;
    if (p < low)
	p = low;
    /* cp now points where we want it */
    return p;
}


/* c__next_word():
 *	Find the next word
 */
protected char *
c__next_word(p, high, n, wtest)
    register char *p, *high;
    register int n;
    int (*wtest) __P((int));
{
    while (n--) {
	while ((p < high) && !(*wtest)((unsigned char) *p))
	    p++;
	while ((p < high) && (*wtest)((unsigned char) *p))
	    p++;
    }
    if (p > high)
	p = high;
    /* p now points where we want it */
    return p;
}

/* cv_next_word():
 *	Find the next word vi style
 */
protected char *
cv_next_word(el, p, high, n, wtest)
    EditLine *el;
    register char *p, *high;
    register int n;
    int (*wtest) __P((int));
{
    int test;

    while (n--) {
    	test = (*wtest)((unsigned char) *p);
	while ((p < high) && (*wtest)((unsigned char) *p) == test)
	    p++;
	/*
	 * vi historically deletes with cw only the word preserving the
	 * trailing whitespace! This is not what 'w' does..
	 */
	if (el->el_chared.c_vcmd.action != (DELETE|INSERT))
	    while ((p < high) && isspace((unsigned char) *p))
		p++;
    }

    /* p now points where we want it */
    if (p > high)
	return high;
    else
	return p;
}


/* cv_prev_word():
 *	Find the previous word vi style
 */
protected char *
cv_prev_word(el, p, low, n, wtest)
    EditLine *el;
    register char *p, *low;
    register int n;
    int (*wtest) __P((int));
{
    int test;

    while (n--) {
	p--;
	/*
	 * vi historically deletes with cb only the word preserving the
	 * leading whitespace! This is not what 'b' does..
	 */
	if (el->el_chared.c_vcmd.action != (DELETE|INSERT))
	    while ((p > low) && isspace((unsigned char) *p))
		p--;
	test = (*wtest)((unsigned char) *p);
	while ((p >= low) && (*wtest)((unsigned char) *p) == test)
	    p--;
	p++;
	while (isspace((unsigned char) *p))
		p++;
    }

    /* p now points where we want it */
    if (p < low)
	return low;
    else
	return p;
}


#ifdef notdef
/* c__number():
 *	Ignore character p points to, return number appearing after that.
 * 	A '$' by itself means a big number; "$-" is for negative; '^' means 1.
 * 	Return p pointing to last char used.
 */
protected char *
c__number(p, num, dval)
    char *p;	/* character position */
    int *num;	/* Return value	*/
    int dval;	/* dval is the number to subtract from like $-3 */
{
    register int i;
    register int sign = 1;

    if (*++p == '^') {
	*num = 1;
	return p;
    }
    if (*p == '$') {
	if (*++p != '-') {
	    *num = 0x7fffffff;	/* Handle $ */
	    return --p;
	}
	sign = -1;		/* Handle $- */
	++p;
    }
    for (i = 0; isdigit((unsigned char) *p); i = 10 * i + *p++ - '0')
	continue;
    *num = (sign < 0 ? dval - i : i);
    return --p;
}
#endif

/* cv_delfini():
 *	Finish vi delete action
 */
protected void
cv_delfini(el)
    EditLine *el;
{
    register int size;
    int oaction;

    if (el->el_chared.c_vcmd.action & INSERT)
	el->el_map.current = el->el_map.key;

    oaction = el->el_chared.c_vcmd.action;
    el->el_chared.c_vcmd.action = NOP;

    if (el->el_chared.c_vcmd.pos == 0)
	return;


    if (el->el_line.cursor > el->el_chared.c_vcmd.pos) {
	size = (int) (el->el_line.cursor - el->el_chared.c_vcmd.pos);
	c_delbefore(el, size);
	el->el_line.cursor = el->el_chared.c_vcmd.pos;
	re_refresh_cursor(el);
    }
    else if (el->el_line.cursor < el->el_chared.c_vcmd.pos) {
	size = (int)(el->el_chared.c_vcmd.pos - el->el_line.cursor);
	c_delafter(el, size);
    }
    else {
	size = 1;
	c_delafter(el, size);
    }
    switch (oaction) {
    case DELETE|INSERT:
	el->el_chared.c_undo.action = DELETE|INSERT;
	break;
    case DELETE:
	el->el_chared.c_undo.action = INSERT;
	break;
    case NOP:
    case INSERT:
    default:
	abort();
	break;
    }


    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.dsize = size;
}


#ifdef notdef
/* ce__endword():
 *	Go to the end of this word according to emacs
 */
protected char *
ce__endword(p, high, n)
    char *p, *high;
    int n;
{
    p++;

    while (n--) {
	while ((p < high) && isspace((unsigned char) *p))
	    p++;
	while ((p < high) && !isspace((unsigned char) *p))
	    p++;
    }

    p--;
    return p;
}
#endif


/* cv__endword():
 *	Go to the end of this word according to vi
 */
protected char *
cv__endword(p, high, n)
    char *p, *high;
    int n;
{
    p++;

    while (n--) {
	while ((p < high) && isspace((unsigned char) *p))
	    p++;

	if (isalnum((unsigned char) *p))
	    while ((p < high) && isalnum((unsigned char) *p))
		p++;
	else
	    while ((p < high) && !(isspace((unsigned char) *p) ||
				   isalnum((unsigned char) *p)))
		p++;
    }
    p--;
    return p;
}

/* ch_init():
 *	Initialize the character editor
 */
protected int
ch_init(el)
    EditLine *el;
{
    el->el_line.buffer              = (char *)  el_malloc(EL_BUFSIZ);
    (void) memset(el->el_line.buffer, 0, EL_BUFSIZ);
    el->el_line.cursor              = el->el_line.buffer;
    el->el_line.lastchar            = el->el_line.buffer;
    el->el_line.limit  		    = &el->el_line.buffer[EL_BUFSIZ - 2];

    el->el_chared.c_undo.buf        = (char *)  el_malloc(EL_BUFSIZ);
    (void) memset(el->el_chared.c_undo.buf, 0, EL_BUFSIZ);
    el->el_chared.c_undo.action     = NOP;
    el->el_chared.c_undo.isize      = 0;
    el->el_chared.c_undo.dsize      = 0;
    el->el_chared.c_undo.ptr        = el->el_line.buffer;

    el->el_chared.c_vcmd.action     = NOP;
    el->el_chared.c_vcmd.pos        = el->el_line.buffer;
    el->el_chared.c_vcmd.ins        = el->el_line.buffer;

    el->el_chared.c_kill.buf        = (char *)  el_malloc(EL_BUFSIZ);
    (void) memset(el->el_chared.c_kill.buf, 0, EL_BUFSIZ);
    el->el_chared.c_kill.mark       = el->el_line.buffer;
    el->el_chared.c_kill.last       = el->el_chared.c_kill.buf;

    el->el_map.current              = el->el_map.key;

    el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
    el->el_state.doingarg  = 0;
    el->el_state.metanext  = 0;
    el->el_state.argument  = 1;
    el->el_state.lastcmd   = ED_UNASSIGNED;

    el->el_chared.c_macro.nline     = NULL;
    el->el_chared.c_macro.level     = -1;
    el->el_chared.c_macro.macro     = (char **) el_malloc(EL_MAXMACRO *
						          sizeof(char *));
    return 0;
}

/* ch_reset():
 *	Reset the character editor
 */
protected void
ch_reset(el)
    EditLine *el;
{
    el->el_line.cursor              = el->el_line.buffer;
    el->el_line.lastchar            = el->el_line.buffer;

    el->el_chared.c_undo.action     = NOP;
    el->el_chared.c_undo.isize      = 0;
    el->el_chared.c_undo.dsize      = 0;
    el->el_chared.c_undo.ptr        = el->el_line.buffer;

    el->el_chared.c_vcmd.action     = NOP;
    el->el_chared.c_vcmd.pos        = el->el_line.buffer;
    el->el_chared.c_vcmd.ins        = el->el_line.buffer;

    el->el_chared.c_kill.mark       = el->el_line.buffer;

    el->el_map.current              = el->el_map.key;

    el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
    el->el_state.doingarg  = 0;
    el->el_state.metanext  = 0;
    el->el_state.argument  = 1;
    el->el_state.lastcmd   = ED_UNASSIGNED;

    el->el_chared.c_macro.level     = -1;

    el->el_history.eventno = 0;
}


/* ch_end():
 *	Free the data structures used by the editor
 */
protected void
ch_end(el)
    EditLine *el;
{
    el_free((ptr_t) el->el_line.buffer);
    el->el_line.buffer = NULL;
    el->el_line.limit = NULL;
    el_free((ptr_t) el->el_chared.c_undo.buf);
    el->el_chared.c_undo.buf = NULL;
    el_free((ptr_t) el->el_chared.c_kill.buf);
    el->el_chared.c_kill.buf = NULL;
    el_free((ptr_t) el->el_chared.c_macro.macro);
    el->el_chared.c_macro.macro = NULL;
    ch_reset(el);
}


/* el_insertstr():
 *	Insert string at cursorI
 */
public int
el_insertstr(el, s)
    EditLine *el;
    char   *s;
{
    int len;

    if ((len = strlen(s)) == 0)
	return -1;
    if (el->el_line.lastchar + len >= el->el_line.limit)
	return -1;

    c_insert(el, len);
    while (*s)
	*el->el_line.cursor++ = *s++;
    return 0;
}


/* el_deletestr():
 *	Delete num characters before the cursor
 */
public void
el_deletestr(el, n)
    EditLine *el;
    int     n;
{
    if (n <= 0)
	return;

    if (el->el_line.cursor < &el->el_line.buffer[n])
	return;

    c_delbefore(el, n);		/* delete before dot */
    el->el_line.cursor -= n;
    if (el->el_line.cursor < el->el_line.buffer)
	el->el_line.cursor = el->el_line.buffer;
}

/* c_gets():
 *	Get a string
 */
protected int
c_gets(el, buf)
    EditLine *el;
    char *buf;
{
    char ch;
    int len = 0;

    for (ch = 0; ch == 0;) {
	if (el_getc(el, &ch) != 1)
	    return ed_end_of_file(el, 0);
	switch (ch) {
	case '\010':      /* Delete and backspace */
	case '\177':
	    if (len > 1) {
		*el->el_line.cursor-- = '\0';
		el->el_line.lastchar = el->el_line.cursor;
		buf[len--] = '\0';
	    }
	    else {
		el->el_line.buffer[0] = '\0';
		el->el_line.lastchar = el->el_line.buffer;
		el->el_line.cursor = el->el_line.buffer;
		return CC_REFRESH;
	    }
	    re_refresh(el);
	    ch = 0;
	    break;

	case '\033':      /* ESC */
	case '\r':	/* Newline */
	case '\n':
	    break;

	default:
	    if (len >= EL_BUFSIZ)
		term_beep(el);
	    else {
		buf[len++] = ch;
		*el->el_line.cursor++ = ch;
		el->el_line.lastchar = el->el_line.cursor;
	    }
	    re_refresh(el);
	    ch = 0;
	    break;
	}
    }
    buf[len] = ch;
    return len;
}


/* c_hpos():
 *	Return the current horizontal position of the cursor
 */
protected int
c_hpos(el)
    EditLine *el;
{
    char *ptr;

    /*
     * Find how many characters till the beginning of this line.
     */
    if (el->el_line.cursor == el->el_line.buffer)
	return 0;
    else {
	for (ptr = el->el_line.cursor - 1;
	     ptr >= el->el_line.buffer && *ptr != '\n';
	     ptr--)
	    continue;
	return el->el_line.cursor - ptr - 1;
    }
}