/*
 * The routines in this file
 * implement commands that work word at
 * a time. There are all sorts of word mode
 * commands. If I do any sentence and/or paragraph
 * mode commands, they are likely to be put in
 * this file.
 */
#include	<stdio.h>
#include	"ed.h"


/* Word wrap on n-spaces.
 * Back-over whatever precedes the point on the current line and
 * stop on the first word-break or the beginning of the line.
 * If we reach the beginning of the line, jump back to the end of the
 * word and start a new line.  Otherwise, break the line at the
 * word-break, eat it, and jump back to the end of the word.
 *	NOTE:  This function may leaving trailing blanks.
 * Returns TRUE on success, FALSE on errors.
 */
wrapword(n)
int n;
{
	register int cnt;
	register char *oldp;

	oldp = curwp->w_dotp;
	cnt = -1;
	do {				
		cnt++;
		if (! backchar(NULL, 1))
			return(FALSE);
	}
	while (! inword());
	if (! backword(NULL, 1))
		return(FALSE);
	if (oldp == curwp->w_dotp && curwp->w_doto) {
		if (! backdel(NULL, 1))
			return(FALSE);
		if (! newline(NULL, 1))
			return(FALSE);
	}
	return(forwword(NULL, 1) && forwchar(NULL, cnt));
}
				
/*
 * Move the cursor backward by
 * "n" words. All of the details of motion
 * are performed by the "backchar" and "forwchar"
 * routines. Error if you try to move beyond
 * the buffers.
 */
backword(f, n)
{
	if (n < 0)
		return (forwword(f, -n));
	if (backchar(FALSE, 1) == FALSE)
		return (FALSE);
	while (n--) {
		while (inword() == FALSE) {
			if (backchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
		while (inword() != FALSE) {
			if (backchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
	}
	return (forwchar(FALSE, 1));
}

/*
 * Move the cursor forward by
 * the specified number of words. All of the
 * motion is done by "forwchar". Error if you
 * try and move beyond the buffer's end.
 */
forwword(f, n)
{
	if (n < 0)
		return (backword(f, -n));
	while (n--) {
		while (inword() == FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
		while (inword() != FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
	}
	return (TRUE);
}

/*
 * Move the cursor forward by
 * the specified number of words. As you move,
 * convert any characters to upper case. Error
 * if you try and move beyond the end of the
 * buffer. Bound to "M-U".
 */
upperword(f, n)
{
	register int	c;

	if (n < 0)
		return (FALSE);
	while (n--) {
		while (inword() == FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
		while (inword() != FALSE) {
			c = lgetc(curwp->w_dotp, curwp->w_doto);
			if (c>='a' && c<='z') {
				c -= 'a'-'A';
				lputc(curwp->w_dotp, curwp->w_doto, c);
				lchange(WFHARD);
			}
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
	}
	return (TRUE);
}

/*
 * Move the cursor forward by
 * the specified number of words. As you move
 * convert characters to lower case. Error if you
 * try and move over the end of the buffer.
 * Bound to "M-L".
 */
lowerword(f, n)
{
	register int	c;

	if (n < 0)
		return (FALSE);
	while (n--) {
		while (inword() == FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
		while (inword() != FALSE) {
			c = lgetc(curwp->w_dotp, curwp->w_doto);
			if (c>='A' && c<='Z') {
				c += 'a'-'A';
				lputc(curwp->w_dotp, curwp->w_doto, c);
				lchange(WFHARD);
			}
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
	}
	return (TRUE);
}

/*
 * Move the cursor forward by
 * the specified number of words. As you move
 * convert the first character of the word to upper
 * case, and subsequent characters to lower case. Error
 * if you try and move past the end of the buffer.
 * Bound to "M-C".
 */
capword(f, n)
{
	register int	c;

	if (n < 0)
		return (FALSE);
	while (n--) {
		while (inword() == FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
		}
		if (inword() != FALSE) {
			c = lgetc(curwp->w_dotp, curwp->w_doto);
			if (c>='a' && c<='z') {
				c -= 'a'-'A';
				lputc(curwp->w_dotp, curwp->w_doto, c);
				lchange(WFHARD);
			}
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
			while (inword() != FALSE) {
				c = lgetc(curwp->w_dotp, curwp->w_doto);
				if (c>='A' && c<='Z') {
					c += 'a'-'A';
					lputc(curwp->w_dotp, curwp->w_doto, c);
					lchange(WFHARD);
				}
				if (forwchar(FALSE, 1) == FALSE)
					return (FALSE);
			}
		}
	}
	return (TRUE);
}

/*
 * Kill forward by "n" words.
 * Remember the location of dot. Move forward
 * by the right number of words. Put dot back where
 * it was and issue the kill command for the
 * right number of characters. Bound to "M-D".
 */
delfword(f, n)
{
	register int	size;
	register LINE	*dotp;
	register int	doto;

	if (n < 0)
		return (FALSE);
	dotp = curwp->w_dotp;
	doto = curwp->w_doto;
	size = 0;
	while (n--) {
		while (inword() == FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
			++size;
		}
		while (inword() != FALSE) {
			if (forwchar(FALSE, 1) == FALSE)
				return (FALSE);
			++size;
		}
	}
	curwp->w_dotp = dotp;
	curwp->w_doto = doto;
	return (ldelete(size, TRUE));
}

/*
 * Kill backwards by "n" words.
 * Move backwards by the desired number of
 * words, counting the characters. When dot is
 * finally moved to its resting place, fire off
 * the kill command. Bound to "M-Rubout" and
 * to "M-Backspace".
 */
delbword(f, n)
{
	register int	size;

	if (n < 0)
		return (FALSE);
	if (backchar(FALSE, 1) == FALSE)
		return (FALSE);
	size = 0;
	while (n--) {
		while (inword() == FALSE) {
			if (backchar(FALSE, 1) == FALSE)
				return (FALSE);
			++size;
		}
		while (inword() != FALSE) {
			if (backchar(FALSE, 1) == FALSE)
				return (FALSE);
			++size;
		}
	}
	if (forwchar(FALSE, 1) == FALSE)
		return (FALSE);
	return (ldelete(size, TRUE));
}

/*
 * Return TRUE if the character at dot
 * is a character that is considered to be
 * part of a word. The word character list is hard
 * coded. Should be setable.
 */
inword()
{
	register int	c;

	if (curwp->w_doto == llength(curwp->w_dotp))
		return (FALSE);
	c = lgetc(curwp->w_dotp, curwp->w_doto);
	if (c>='a' && c<='z')
		return (TRUE);
	if (c>='A' && c<='Z')
		return (TRUE);
	if (c>='0' && c<='9')
		return (TRUE);
	if (c=='$' || c=='_')			/* For identifiers	*/
		return (TRUE);
	return (FALSE);
}