/* move1.c */
/* Author:
* Steve Kirkendall
* 14407 SW Teal Blvd. #C
* Beaverton, OR 97005
* kirkenda@cs.pdx.edu
*/
/* This file contains most movement functions */
#include "config.h"
#include "vi.h"
#include "ctype.h"
MARK m_updnto(m, cnt, cmd)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
int cmd; /* the command character */
{
DEFAULT(cmd == 'G' ? nlines : 1L);
/* move up or down 'cnt' lines */
switch (cmd)
{
case ctrl('P'):
case '-':
case 'k':
m -= MARK_AT_LINE(cnt);
break;
case 'G':
if (cnt < 1L || cnt > nlines)
{
msg("Only %ld lines", nlines);
return MARK_UNSET;
}
m = MARK_AT_LINE(cnt);
break;
case '_':
cnt--;
/* fall through... */
default:
m += MARK_AT_LINE(cnt);
}
/* if that left us screwed up, then fail */
if (m < MARK_FIRST || markline(m) > nlines)
{
return MARK_UNSET;
}
return m;
}
/*ARGSUSED*/
MARK m_right(m, cnt, key, prevkey)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
int key; /* movement keystroke */
int prevkey;/* operator keystroke, or 0 if none */
{
int idx; /* index of the new cursor position */
DEFAULT(1);
/* If used with an operator, then move 1 less character, since the 'l'
* command includes the character that it moves onto.
*/
if (prevkey != '\0')
{
cnt--;
}
/* move to right, if that's OK */
pfetch(markline(m));
idx = markidx(m) + cnt;
if (idx < plen)
{
m += cnt;
}
else
{
return MARK_UNSET;
}
return m;
}
/*ARGSUSED*/
MARK m_left(m, cnt)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
{
DEFAULT(1);
/* move to the left, if that's OK */
if (markidx(m) >= cnt)
{
m -= cnt;
}
else
{
return MARK_UNSET;
}
return m;
}
/*ARGSUSED*/
MARK m_tocol(m, cnt, cmd)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
int cmd; /* either ctrl('X') or '|' */
{
char *text; /* text of the line */
int col; /* column number */
int idx; /* index into the line */
/* if doing ^X, then adjust for sideways scrolling */
if (cmd == ctrl('X'))
{
DEFAULT(*o_columns & 0xff);
cnt += leftcol;
}
else
{
DEFAULT(1);
}
/* internally, columns are numbered 0..COLS-1, not 1..COLS */
cnt--;
/* if 0, that's easy */
if (cnt == 0)
{
m &= ~(BLKSIZE - 1);
return m;
}
/* find that column within the line */
pfetch(markline(m));
text = ptext;
for (col = idx = 0; col < cnt && *text; text++, idx++)
{
if (*text == '\t' && !*o_list)
{
col += *o_tabstop;
col -= col % *o_tabstop;
}
else if (UCHAR(*text) < ' ' || *text == '\177')
{
col += 2;
}
#ifndef NO_CHARATTR
else if (text[0] == '\\' && text[1] == 'f' && text[2] && *o_charattr)
{
text += 2; /* plus one more as part of for loop */
}
#endif
else
{
col++;
}
}
if (!*text)
{
/* the desired column was past the end of the line, so
* act like the user pressed "$" instead.
*/
return m | (BLKSIZE - 1);
}
else
{
m = (m & ~(BLKSIZE - 1)) + idx;
}
return m;
}
/*ARGSUSED*/
MARK m_front(m, cnt)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument (ignored) */
{
char *scan;
/* move to the first non-whitespace character */
pfetch(markline(m));
scan = ptext;
m &= ~(BLKSIZE - 1);
while (*scan == ' ' || *scan == '\t')
{
scan++;
m++;
}
return m;
}
/*ARGSUSED*/
MARK m_rear(m, cnt)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument (ignored) */
{
/* Try to move *EXTREMELY* far to the right. It is fervently hoped
* that other code will convert this to a more reasonable MARK before
* anything tries to actually use it. (See adjmove() in vi.c)
*/
return m | (BLKSIZE - 1);
}
#ifndef NO_SENTENCE
static int isperiod(ptr)
char *ptr; /* pointer to possible sentence-ender */
{
/* if not '.', '?', or '!', then it isn't a sentence ender */
if (*ptr != '.' && *ptr != '?' && *ptr != '!')
{
return FALSE;
}
/* skip any intervening ')', ']', or '"' characters */
do
{
ptr++;
} while (*ptr == ')' || *ptr == ']' || *ptr == '"');
/* do we have two spaces or EOL? */
if (!*ptr || ptr[0] == ' ' && ptr[1] == ' ')
{
return TRUE;
}
return FALSE;
}
/*ARGSUSED*/
MARK m_sentence(m, cnt, cmd)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
int cmd; /* either '(' or ')' */
{
REG char *text;
REG long l;
#ifndef CRUNCH
/* figure out where the paragraph boundary is */
MARK pp = m_paragraph(m, 1L, cmd=='(' ? '{' : '}');
#endif
DEFAULT(1);
/* If '(' command, then move back one word, so that if we hit '(' at
* the start of a sentence we don't simply stop at the end of the
* previous sentence and bounce back to the start of this one again.
*/
if (cmd == '(')
{
m = m_bword(m, 1L, 'b');
if (!m)
{
return m;
}
}
/* get the current line */
l = markline(m);
pfetch(l);
text = ptext + markidx(m);
/* for each requested sentence... */
while (cnt-- > 0)
{
/* search forward for one of [.?!] followed by spaces or EOL */
do
{
if (cmd == ')')
{
/* move forward, wrap at end of line */
if (!text[0])
{
if (l == nlines)
{
goto BreakBreak;
}
l++;
pfetch(l);
text = ptext;
}
else
{
text++;
}
}
else
{
/* move backward, wrap at beginning of line */
if (text == ptext)
{
do
{
if (l == 1L)
{
goto BreakBreak;
}
l--;
pfetch(l);
} while (!*ptext);
text = ptext + plen - 1;
}
else
{
text--;
}
}
} while (!isperiod(text));
}
BreakBreak:
/* construct a mark for this location */
m = buildmark(text);
/* move forward to the first word of the next sentence */
m = m_fword(m, 1L, 'w', '\0');
if (m == MARK_UNSET)
{
m = MARK_EOF;
}
#ifndef CRUNCH
/* don't cross the paragraph boundary */
if (pp && ((cmd=='(') ? (m<pp) : (m>pp)))
{
m = pp;
}
#endif
return m;
}
#endif
MARK m_paragraph(m, cnt, cmd)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument */
int cmd; /* either '{' or '}' */
{
char *text; /* text of the current line */
char *pscn; /* used to scan thru value of "paragraphs" option */
long l, ol; /* current line number, original line number */
int dir; /* -1 if we're moving up, or 1 if down */
char col0; /* character to expect in column 0 */
long limit; /* line where searching must stop */
#ifndef NO_SENTENCE
# define SENTENCE(x) (x)
char *list; /* either o_sections or o_paragraph */
#else
# define SENTENCE(x)
#endif
#ifndef CRUNCH
MARK ss;
#endif
DEFAULT(1);
/* set the direction, based on the command */
switch (cmd)
{
case '{':
dir = -1;
col0 = '\0';
SENTENCE(list = o_paragraphs);
#ifndef CRUNCH
ss = m_paragraph(m, 1L, '<');
if (ss)
limit = markline(ss);
else
#endif
limit = 1L;
break;
case '}':
dir = 1;
col0 = '\0';
SENTENCE(list = o_paragraphs);
#ifndef CRUNCH
ss = m_paragraph(m, 1L, '>');
if (ss)
limit = markline(ss);
else
#endif
limit = nlines;
break;
case '[':
if (getkey(0) != '[')
{
return MARK_UNSET;
}
/* fall through... */
case '<':
dir = -1;
col0 = '{';
SENTENCE(list = o_sections);
limit = 1L;
break;
case ']':
if (getkey(0) != ']')
{
return MARK_UNSET;
}
/* fall through... */
case '>':
dir = 1;
col0 = '{';
SENTENCE(list = o_sections);
limit = nlines;
break;
}
ol = l = markline(m);
/* for each paragraph that we want to travel through... */
while (l != limit && cnt-- > 0)
{
/* skip blank lines between paragraphs */
while (l != limit && col0 == *(text = fetchline(l)))
{
l += dir;
}
/* skip non-blank lines that aren't paragraph separators
*/
do
{
#ifndef NO_SENTENCE
if (*text == '.' && l != ol)
{
for (pscn = list; pscn[0] && pscn[1]; pscn += 2)
{
if (pscn[0] == text[1] && pscn[1] == text[2])
{
pscn = (char *)0;
goto BreakBreak;
}
}
}
#endif
l += dir;
} while (l != limit && col0 != *(text = fetchline(l)));
BreakBreak: ;
}
m = MARK_AT_LINE(l);
#ifdef DEBUG2
debout("m_paragraph() returning %ld.%d\n", markline(m), markidx(m));
#endif
return m;
}
/*ARGSUSED*/
MARK m_match(m, cnt)
MARK m; /* movement is relative to this mark */
long cnt; /* a numeric argument (normally 0) */
{
long l;
REG char *text;
REG char match;
REG char nest;
REG int count;
#ifndef NO_EXTENSIONS
/* if we're given a number, then treat it as a percentage of the file */
if (cnt > 0)
{
/* make sure it is a reasonable number */
if (cnt > 100)
{
msg("can only be from 1%% to 100%%");
return MARK_UNSET;
}
/* return the appropriate line number */
l = (nlines - 1L) * cnt / 100L + 1L;
return MARK_AT_LINE(l);
}
#endif /* undef NO_EXTENSIONS */
/* get the current line */
l = markline(m);
pfetch(l);
text = ptext + markidx(m);
/* search forward within line for one of "[](){}" */
for (match = '\0'; !match && *text; text++)
{
/* tricky way to recognize 'em in ASCII */
nest = *text;
if ((nest & 0xdf) == ']' || (nest & 0xdf) == '[')
{
match = nest ^ ('[' ^ ']');
}
else if ((nest & 0xfe) == '(')
{
match = nest ^ ('(' ^ ')');
}
else
{
match = 0;
}
}
if (!match)
{
return MARK_UNSET;
}
text--;
/* search forward or backward for match */
if (match == '(' || match == '[' || match == '{')
{
/* search backward */
for (count = 1; count > 0; )
{
/* wrap at beginning of line */
if (text == ptext)
{
do
{
if (l <= 1L)
{
return MARK_UNSET;
}
l--;
pfetch(l);
} while (!*ptext);
text = ptext + plen - 1;
}
else
{
text--;
}
/* check the char */
if (*text == match)
count--;
else if (*text == nest)
count++;
}
}
else
{
/* search forward */
for (count = 1; count > 0; )
{
/* wrap at end of line */
if (!*text)
{
if (l >= nlines)
{
return MARK_UNSET;
}
l++;
pfetch(l);
text = ptext;
}
else
{
text++;
}
/* check the char */
if (*text == match)
count--;
else if (*text == nest)
count++;
}
}
/* construct a mark for this place */
m = buildmark(text);
return m;
}
/*ARGSUSED*/
MARK m_tomark(m, cnt, key)
MARK m; /* movement is relative to this mark */
long cnt; /* (ignored) */
int key; /* keystroke - the mark to move to */
{
/* mark '' is a special case */
if (key == '\'' || key == '`')
{
if (mark[26] == MARK_UNSET)
{
return MARK_FIRST;
}
else
{
return mark[26];
}
}
/* if not a valid mark number, don't move */
if (key < 'a' || key > 'z')
{
return MARK_UNSET;
}
/* return the selected mark -- may be MARK_UNSET */
if (!mark[key - 'a'])
{
msg("mark '%c is unset", key);
}
return mark[key - 'a'];
}