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word.c
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C/C++ Source or Header
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1998-04-02
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16KB
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554 lines
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: word.c,v 4.30 1998/04/02 20:48:47 mikes Exp $";
#endif
/*
* Program: Word at a time routines
*
*
* Michael Seibel
* Networks and Distributed Computing
* Computing and Communications
* University of Washington
* Administration Builiding, AG-44
* Seattle, Washington, 98195, USA
* Internet: mikes@cac.washington.edu
*
* Please address all bugs and comments to "pine-bugs@cac.washington.edu"
*
*
* Pine and Pico are registered trademarks of the University of Washington.
* No commercial use of these trademarks may be made without prior written
* permission of the University of Washington.
*
* Pine, Pico, and Pilot software and its included text are Copyright
* 1989-1998 by the University of Washington.
*
* The full text of our legal notices is contained in the file called
* CPYRIGHT, included with this distribution.
*
*/
/*
* 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 "headers.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.
* Returns TRUE on success, FALSE on errors.
*/
wrapword()
{
register int cnt; /* size of word wrapped to next line */
register int bp; /* index to wrap on */
register int first = -1;
register int i;
if(curwp->w_doto <= 0) /* no line to wrap? */
return(FALSE);
for(bp = cnt = i = 0; cnt < llength(curwp->w_dotp) && !bp; cnt++, i++){
if(isspace((unsigned char) lgetc(curwp->w_dotp, cnt).c)){
first = 0;
if(lgetc(curwp->w_dotp, cnt).c == TAB)
while(i+1 & 0x07)
i++;
}
else if(!first)
first = cnt;
if(first > 0 && i >= fillcol)
bp = first;
}
if(!bp)
return(FALSE);
/* bp now points to the first character of the next line */
cnt = curwp->w_doto - bp;
curwp->w_doto = bp;
if(!lnewline()) /* break the line */
return(FALSE);
/* clean up trailing whitespace from line above ... */
if(backchar(FALSE, 1)){
while(llength(curwp->w_dotp) > 0 && backchar(FALSE, 1)
&& isspace((unsigned char) lgetc(curwp->w_dotp, curwp->w_doto).c)
&& (cnt > 0 || cnt < -1)){
forwdel(FALSE, 1);
if(cnt < 0)
++cnt;
}
gotoeol(FALSE, 1);
forwchar(FALSE, 1); /* goto first char of next line */
}
/*
* if there's a line below, it doesn't start with whitespace
* and there's room for this line...
*/
if(!(curbp->b_flag & BFWRAPOPEN)
&& lforw(curwp->w_dotp) != curbp->b_linep
&& llength(lforw(curwp->w_dotp))
&& !isspace((unsigned char) lgetc(lforw(curwp->w_dotp), 0).c)
&& (llength(curwp->w_dotp) + llength(lforw(curwp->w_dotp)) < fillcol)){
gotoeol(0, 1); /* then pull text up from below */
if(lgetc(curwp->w_dotp, curwp->w_doto - 1).c != ' ')
linsert(1, ' ');
forwdel(0, 1);
gotobol(0, 1);
}
curbp->b_flag &= ~BFWRAPOPEN; /* don't open new line next wrap */
/* restore dot (account for NL) */
if(cnt && !forwchar(0, cnt < 0 ? cnt-1 : cnt))
return(FALSE);
return(TRUE);
}
/*
* 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)
int 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)
int f, n;
{
if (n < 0)
return (backword(f, -n));
while (n--) {
#if NFWORD
while (inword() != FALSE) {
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
}
#endif
while (inword() == FALSE) {
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
}
#if NFWORD == 0
while (inword() != FALSE) {
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
}
#endif
}
return(TRUE);
}
#ifdef MAYBELATER
/*
* 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;
CELL ac;
ac.a = 0;
if (curbp->b_mode&MDVIEW) /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
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).c;
if (c>='a' && c<='z') {
ac.c = (c -= 'a'-'A');
lputc(curwp->w_dotp, curwp->w_doto, ac);
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;
CELL ac;
ac.a = 0;
if (curbp->b_mode&MDVIEW) /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
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).c;
if (c>='A' && c<='Z') {
ac.c (c += 'a'-'A');
lputc(curwp->w_dotp, curwp->w_doto, ac);
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;
CELL ac;
ac.a = 0;
if (curbp->b_mode&MDVIEW) /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
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).c;
if (c>='a' && c<='z') {
ac.c = (c -= 'a'-'A');
lputc(curwp->w_dotp, curwp->w_doto, ac);
lchange(WFHARD);
}
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
while (inword() != FALSE) {
c = lgetc(curwp->w_dotp, curwp->w_doto).c;
if (c>='A' && c<='Z') {
ac.c = (c += 'a'-'A');
lputc(curwp->w_dotp, curwp->w_doto, ac);
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 long size;
register LINE *dotp;
register int doto;
if (curbp->b_mode&MDVIEW) /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
if (n < 0)
return (FALSE);
dotp = curwp->w_dotp;
doto = curwp->w_doto;
size = 0L;
while (n--) {
#if NFWORD
while (inword() != FALSE) {
if (forwchar(FALSE,1) == FALSE)
return(FALSE);
++size;
}
#endif
while (inword() == FALSE) {
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
++size;
}
#if NFWORD == 0
while (inword() != FALSE) {
if (forwchar(FALSE, 1) == FALSE)
return (FALSE);
++size;
}
#endif
}
curwp->w_dotp = dotp;
curwp->w_doto = doto;
return (ldelete(size, kinsert));
}
/*
* 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 long size;
if (curbp->b_mode&MDVIEW) /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
if (n < 0)
return (FALSE);
if (backchar(FALSE, 1) == FALSE)
return (FALSE);
size = 0L;
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, kinsert));
}
#endif /* MAYBELATER */
/*
* 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()
{
return(curwp->w_doto < llength(curwp->w_dotp)
&& isalnum((unsigned char)lgetc(curwp->w_dotp, curwp->w_doto).c));
}
/*
* Return TRUE if whatever starts the line matches the quote string
*/
quote_match(q, l)
char *q;
LINE *l;
{
register int i;
for(i = 0; i <= llength(l) && q[i]; i++)
if(q[i] != lgetc(l, i).c)
return(0);
return(1);
}
fillpara(f, n) /* Fill the current paragraph according to the current
fill column */
int f, n; /* deFault flag and Numeric argument */
{
int i, j, c, qlen, word[NSTRING], same_word,
spaces, word_len, line_len, line_last;
char *qstr;
LINE *eopline;
REGION region;
if(curbp->b_mode&MDVIEW){ /* don't allow this command if */
return(rdonly()); /* we are in read only mode */
}
else if (fillcol == 0) { /* no fill column set */
mlwrite("No fill column set", NULL);
return(FALSE);
}
else if(curwp->w_dotp == curbp->b_linep) /* don't wrap! */
return(FALSE);
/* record the pointer to the line just past the EOP */
if(gotoeop(FALSE, 1) == FALSE)
return(FALSE);
eopline = curwp->w_dotp; /* first line of para */
/* and back to the beginning of the paragraph */
gotobop(FALSE, 1);
/* determine if we're justifying quoted text or not */
qstr = (Pmaster && Pmaster->quote_str
&& quote_match(Pmaster->quote_str, curwp->w_dotp))
? Pmaster->quote_str : NULL;
qlen = qstr ? strlen(qstr) : 0;
/* let yank() know that it may be restoring a paragraph */
thisflag |= CFFILL;
if(!Pmaster)
sgarbk = TRUE;
curwp->w_flag |= WFMODE;
/* cut the paragraph into our fill buffer */
fdelete();
curwp->w_doto = 0;
getregion(®ion, eopline, llength(eopline));
if(!ldelete(region.r_size, finsert))
return(FALSE);
/* Now insert it back wrapped */
spaces = word_len = line_len = same_word = 0;
/* Beginning with leading quoting... */
if(qstr){
while(qstr[line_len])
linsert(1, qstr[line_len++]);
line_last = ' '; /* no word-flush space! */
}
/* ...and leading white space */
for(i = qlen; (c = fremove(i)) == ' ' || c == TAB; i++){
linsert(1, line_last = c);
line_len += ((c == TAB) ? (~line_len & 0x07) + 1 : 1);
}
/* then digest the rest... */
while((c = fremove(i++)) > 0){
switch(c){
case '\n' :
i += qlen; /* skip next quote string */
case TAB :
case ' ' :
spaces++;
same_word = 0;
break;
default :
if(spaces){ /* flush word? */
if(line_len
&& line_len + word_len + qlen + 1 > fillcol
&& (line_len = fpnewline(qstr)))
line_last = ' '; /* no word-flush space! */
if(word_len){ /* word to write? */
if(line_len && !isspace((unsigned char) line_last)){
linsert(1, ' '); /* need padding? */
line_len++;
}
line_len += word_len;
for(j = 0; j < word_len; j++)
linsert(1, line_last = word[j]);
if(spaces > 1 && strchr(".?!:;\")", line_last)){
linsert(2, line_last = ' ');
line_len += 2;
}
word_len = 0;
}
spaces = 0;
}
if(word_len + 1 >= NSTRING){
/* Magic! Fake that we output a wrapped word */
if(line_len && !same_word++)
line_len = fpnewline(qstr);
line_len += word_len;
for(j = 0; j < word_len; j++)
linsert(1, word[j]);
word_len = 0;
line_last = ' ';
}
word[word_len++] = c;
break;
}
}
if(word_len){
if(line_len + word_len + qlen + 1 > fillcol)
(void) fpnewline(qstr);
else if(line_len && !isspace((unsigned char) line_last))
linsert(1, ' ');
for(j = 0; j < word_len; j++)
linsert(1, word[j]);
}
/* Leave cursor on first char of first line after paragraph */
curwp->w_dotp = lforw(curwp->w_dotp);
curwp->w_doto = 0;
return(TRUE);
}
/*
* fpnewline - output a fill paragraph newline mindful of quote string
*/
fpnewline(quote)
char *quote;
{
int len;
lnewline();
for(len = 0; quote && *quote; quote++, len++)
linsert(1, *quote);
return(len);
}