home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
United Public Domain Gold 4
/
United Public Domain Gold 4.iso
/
fredfish
/
ff.0042.dms
/
ff.0042.adf
/
MG1a
/
search.c
< prev
next >
Wrap
C/C++ Source or Header
|
1986-11-26
|
14KB
|
632 lines
/*
* Search commands.
* The functions in this file implement the
* search commands (both plain and incremental searches
* are supported) and the query-replace command.
*
* The plain old search code is part of the original
* MicroEMACS "distribution". The incremental search code,
* and the query-replace code, is by Rich Ellison.
*/
#include "def.h"
#define SRCH_BEGIN (0) /* Search sub-codes. */
#define SRCH_FORW (-1)
#define SRCH_BACK (-2)
#define SRCH_NOPR (-3)
#define SRCH_ACCM (-4)
#define SRCH_MARK (-5)
typedef struct {
int s_code;
LINE *s_dotp;
int s_doto;
} SRCHCOM;
static SRCHCOM cmds[NSRCH];
static int cip;
int srch_lastdir = SRCH_NOPR; /* Last search flags. */
/*
* Search forward.
* Get a search string from the user, and search for it,
* starting at ".". If found, "." gets moved to just after the
* matched characters, and display does all the hard stuff.
* If not found, it just prints a message.
*/
/*ARGSUSED*/
forwsearch(f, n, k) {
register int s;
if ((s=readpattern("Search")) != TRUE)
return (s);
if (forwsrch() == FALSE) {
ewprintf("Search failed: \"%s\"", pat);
return (FALSE);
}
srch_lastdir = SRCH_FORW;
return (TRUE);
}
/*
* Reverse search.
* Get a search string from the user, and search, starting at "."
* and proceeding toward the front of the buffer. If found "." is left
* pointing at the first character of the pattern [the last character that
* was matched].
*/
/*ARGSUSED*/
backsearch(f, n, k) {
register int s;
if ((s=readpattern("Search backward")) != TRUE)
return (s);
if (backsrch() == FALSE) {
ewprintf("Search failed: \"%s\"", pat);
return (FALSE);
}
srch_lastdir = SRCH_BACK;
return (TRUE);
}
/*
* Search again, using the same search string
* and direction as the last search command. The direction
* has been saved in "srch_lastdir", so you know which way
* to go.
*/
/*ARGSUSED*/
searchagain(f, n, k) {
if (srch_lastdir == SRCH_FORW) {
if (forwsrch() == FALSE) {
ewprintf("Search failed: \"%s\"", pat);
return (FALSE);
}
return (TRUE);
}
if (srch_lastdir == SRCH_BACK) {
if (backsrch() == FALSE) {
ewprintf("Search failed: \"%s\"", pat);
return (FALSE);
}
return (TRUE);
}
ewprintf("No last search");
return (FALSE);
}
/*
* Use incremental searching, initially in the forward direction.
* isearch ignores any explicit arguments.
*/
/*ARGSUSED*/
forwisearch(f, n, k) {
return (isearch(SRCH_FORW));
}
/*
* Use incremental searching, initially in the reverse direction.
* isearch ignores any explicit arguments.
*/
/*ARGSUSED*/
backisearch(f, n, k) {
return (isearch(SRCH_BACK));
}
/*
* Incremental Search.
* dir is used as the initial direction to search.
* ^S switch direction to forward
* ^R switch direction to reverse
* ^Q quote next character (allows searching for ^N etc.)
* <ESC> exit from Isearch
* <DEL> undoes last character typed. (tricky job to do this correctly).
* other ^ exit search, don't set mark
* else accumulate into search string
*/
isearch(dir) {
register int c;
register LINE *clp;
register int cbo;
register int success;
int pptr;
char opat[NPAT];
for (cip=0; cip<NSRCH; cip++)
cmds[cip].s_code = SRCH_NOPR;
(VOID) strcpy(opat, pat);
cip = 0;
pptr = -1;
clp = curwp->w_dotp;
cbo = curwp->w_doto;
is_lpush();
is_cpush(SRCH_BEGIN);
success = TRUE;
is_prompt(dir, TRUE, success);
for (;;) {
update();
switch (c = (char) getkey(KQUOTE)) {
case METACH:
srch_lastdir = dir;
curwp->w_markp = clp;
curwp->w_marko = cbo;
if (kbdmop == NULL) ewprintf("Mark set");
return (TRUE);
case CCHR('G'):
if (success != TRUE) {
while (is_peek() == SRCH_ACCM)
if (is_undo(&pptr, &dir) == FALSE)
break;
success = TRUE;
is_prompt(dir, pptr < 0, success);
break;
}
curwp->w_dotp = clp;
curwp->w_doto = cbo;
curwp->w_flag |= WFMOVE;
srch_lastdir = dir;
(VOID) ctrlg(FALSE, 0, KRANDOM);
(VOID) strcpy(pat, opat);
return ABORT;
case CCHR('S'):
if (dir == SRCH_BACK) {
dir = SRCH_FORW;
is_lpush();
is_cpush(SRCH_FORW);
success = TRUE;
}
if (success==FALSE && dir==SRCH_FORW)
break;
is_lpush();
pptr = strlen(pat);
(VOID) forwchar(FALSE, 1, KRANDOM);
if (is_find(SRCH_FORW) != FALSE) is_cpush(SRCH_MARK);
else {
(VOID) backchar(FALSE, 1, KRANDOM);
ttbeep();
success = FALSE;
}
is_prompt(dir, pptr < 0, success);
break;
case CCHR('R'):
if (dir == SRCH_FORW) {
dir = SRCH_BACK;
is_lpush();
is_cpush(SRCH_BACK);
success = TRUE;
}
if (success==FALSE && dir==SRCH_BACK)
break;
is_lpush();
pptr = strlen(pat);
(VOID) backchar(FALSE, 1, KRANDOM);
if (is_find(SRCH_BACK) != FALSE) is_cpush(SRCH_MARK);
else {
(VOID) forwchar(FALSE, 1, KRANDOM);
ttbeep();
success = FALSE;
}
is_prompt(dir, pptr < 0, success);
break;
case 0x7F:
if (is_undo(&pptr, &dir) != TRUE) return FALSE;
if (is_peek() != SRCH_ACCM) success = TRUE;
is_prompt(dir, pptr < 0, success);
break;
case CCHR('Q'):
c = (char) getkey(KQUOTE);
goto addchar;
case CCHR('M'):
c = CCHR('J');
case CCHR('J'):
goto addchar;
default:
if (ISCTRL(c) != FALSE) {
c += '@';
c |= KCTRL;
success = execute((KEY) c, FALSE, 1);
curwp->w_markp = clp;
curwp->w_marko = cbo;
if (kbdmop == NULL) ewprintf("Mark set");
curwp->w_flag |= WFMOVE;
return (success);
}
addchar:
if (pptr == -1)
pptr = 0;
if (pptr == 0)
success = TRUE;
pat[pptr++] = c;
if (pptr == NPAT) {
ewprintf("Pattern too long");
return FALSE;
}
pat[pptr] = '\0';
is_lpush();
if (success != FALSE) {
if (is_find(dir) != FALSE)
is_cpush(c);
else {
success = FALSE;
ttbeep();
is_cpush(SRCH_ACCM);
}
} else
is_cpush(SRCH_ACCM);
is_prompt(dir, FALSE, success);
}
}
}
is_cpush(cmd) register int cmd; {
if (++cip >= NSRCH)
cip = 0;
cmds[cip].s_code = cmd;
}
is_lpush() {
register int ctp;
ctp = cip+1;
if (ctp >= NSRCH)
ctp = 0;
cmds[ctp].s_code = SRCH_NOPR;
cmds[ctp].s_doto = curwp->w_doto;
cmds[ctp].s_dotp = curwp->w_dotp;
}
is_pop() {
if (cmds[cip].s_code != SRCH_NOPR) {
curwp->w_doto = cmds[cip].s_doto;
curwp->w_dotp = cmds[cip].s_dotp;
curwp->w_flag |= WFMOVE;
cmds[cip].s_code = SRCH_NOPR;
}
if (--cip <= 0)
cip = NSRCH-1;
}
is_peek() {
return cmds[cip].s_code;
}
is_undo(pptr, dir) register int *pptr; register int *dir; {
register int redo = FALSE ;
switch (cmds[cip].s_code) {
case SRCH_BEGIN:
case SRCH_NOPR:
*pptr = -1;
case SRCH_MARK:
break;
case SRCH_FORW:
*dir = SRCH_BACK;
redo = TRUE;
break;
case SRCH_BACK:
*dir = SRCH_FORW;
redo = TRUE;
break;
case SRCH_ACCM:
default:
*pptr -= 1;
if (*pptr < 0)
*pptr = 0;
pat[*pptr] = '\0';
break;
}
is_pop();
if (redo) return is_undo(pptr, dir);
return (TRUE);
}
is_find(dir) register int dir; {
register int plen, odoto;
register LINE *odotp ;
odoto = curwp->w_doto;
odotp = curwp->w_dotp;
plen = strlen(pat);
if (plen != 0) {
if (dir==SRCH_FORW) {
(VOID) backchar(TRUE, plen, KRANDOM);
if (forwsrch() == FALSE) {
curwp->w_doto = odoto;
curwp->w_dotp = odotp;
return (FALSE);
}
return (TRUE);
}
if (dir==SRCH_BACK) {
(VOID) forwchar(TRUE, plen, KRANDOM);
if (backsrch() == FALSE) {
curwp->w_doto = odoto;
curwp->w_dotp = odotp;
return (FALSE);
}
return (TRUE);
}
ewprintf("bad call to is_find");
return FALSE;
}
return (FALSE);
}
/*
* If called with "dir" not one of SRCH_FORW
* or SRCH_BACK, this routine used to print an error
* message. It also used to return TRUE or FALSE,
* depending on if it liked the "dir". However, none
* of the callers looked at the status, so I just
* made the checking vanish.
*/
is_prompt(dir, flag, success) {
VOID is_dspl();
if (dir == SRCH_FORW) {
if (success != FALSE)
is_dspl("I-search", flag);
else
is_dspl("Failing I-search", flag);
} else if (dir == SRCH_BACK) {
if (success != FALSE)
is_dspl("I-search backward", flag);
else
is_dspl("Failing I-search backward", flag);
} else ewprintf("Broken call to is_prompt");
}
/*
* Prompt writing routine for the incremental search.
* The "prompt" is just a string. The "flag" determines
* whether pat should be printed.
*/
VOID
is_dspl(prompt, flag) char *prompt; {
if (kbdmop != NULL) return;
if (flag != FALSE)
ewprintf("%s: ", prompt);
else
ewprintf("%s: %s", prompt, pat);
}
/*
* Query Replace.
* Replace strings selectively. Does a search and replace operation.
*/
/*ARGSUSED*/
queryrepl(f, n, k) {
register int s;
register int rcnt = 0; /* Replacements made so far */
register int plen; /* length of found string */
char news[NPAT]; /* replacement string */
if ((s=readpattern("Query replace")) != TRUE)
return (s);
if ((s=ereply("Query replace %s with: ",news, NPAT, pat)) == ABORT)
return (s);
if (s == FALSE)
news[0] = '\0';
if (kbdmop == NULL) ewprintf("Query replacing %s with %s:", pat, news);
plen = strlen(pat);
/*
* Search forward repeatedly, checking each time whether to insert
* or not. The "!" case makes the check always true, so it gets put
* into a tighter loop for efficiency.
*/
while (forwsrch() == TRUE) {
retry:
update();
switch (getkey(KQUOTE)) {
case ' ':
if (lreplace((RSIZE) plen, news, f) == FALSE)
return (FALSE);
rcnt++;
break;
case '.':
if (lreplace((RSIZE) plen, news, f) == FALSE)
return (FALSE);
rcnt++;
goto stopsearch;
case CCHR('G'): /* ^G or ESC */
(VOID) ctrlg(FALSE, 0, KRANDOM);
case 033:
goto stopsearch;
case '!':
do {
if (lreplace((RSIZE) plen, news, f) == FALSE)
return (FALSE);
rcnt++;
} while (forwsrch() == TRUE);
goto stopsearch;
case 0x7F: /* To not replace */
break;
default:
ewprintf("<SP> replace, [.] rep-end, <DEL> don't, [!] repl rest <ESC> quit");
goto retry;
}
}
stopsearch:
curwp->w_flag |= WFHARD;
update();
if (kbdmop == NULL) {
if (rcnt == 0)
ewprintf("(No replacements done)");
else if (rcnt == 1)
ewprintf("(1 replacement done)");
else
ewprintf("(%d replacements done)", rcnt);
}
return TRUE;
}
/*
* This routine does the real work of a
* forward search. The pattern is sitting in the external
* variable "pat". If found, dot is updated, the window system
* is notified of the change, and TRUE is returned. If the
* string isn't found, FALSE is returned.
*/
forwsrch() {
register LINE *clp;
register int cbo;
register LINE *tlp;
register int tbo;
register char *pp;
register int c;
clp = curwp->w_dotp;
cbo = curwp->w_doto;
while (clp != curbp->b_linep) {
if (cbo == llength(clp)) {
clp = lforw(clp);
cbo = 0;
c = SEOL;
} else
c = lgetc(clp, cbo++);
if (eq(c, pat[0]) != FALSE) {
tlp = clp;
tbo = cbo;
pp = &pat[1];
while (*pp != 0) {
if (tlp == curbp->b_linep)
goto fail;
if (tbo == llength(tlp)) {
tlp = lforw(tlp);
if (tlp == curbp->b_linep)
goto fail;
tbo = 0;
c = SEOL;
} else
c = lgetc(tlp, tbo++);
if (eq(c, *pp++) == FALSE)
goto fail;
}
curwp->w_dotp = tlp;
curwp->w_doto = tbo;
curwp->w_flag |= WFMOVE;
return (TRUE);
}
fail: ;
}
return (FALSE);
}
/*
* This routine does the real work of a
* backward search. The pattern is sitting in the external
* variable "pat". If found, dot is updated, the window system
* is notified of the change, and TRUE is returned. If the
* string isn't found, FALSE is returned.
*/
backsrch() {
register LINE *clp;
register int cbo;
register LINE *tlp;
register int tbo;
register int c;
register char *epp;
register char *pp;
for (epp = &pat[0]; epp[1] != 0; ++epp)
;
clp = curwp->w_dotp;
cbo = curwp->w_doto;
for (;;) {
if (cbo == 0) {
clp = lback(clp);
if (clp == curbp->b_linep)
return (FALSE);
cbo = llength(clp)+1;
}
if (--cbo == llength(clp))
c = SEOL;
else
c = lgetc(clp,cbo);
if (eq(c, *epp) != FALSE) {
tlp = clp;
tbo = cbo;
pp = epp;
while (pp != &pat[0]) {
if (tbo == 0) {
tlp = lback(tlp);
if (tlp == curbp->b_linep)
goto fail;
tbo = llength(tlp)+1;
}
if (--tbo == llength(tlp))
c = SEOL;
else
c = lgetc(tlp,tbo);
if (eq(c, *--pp) == FALSE)
goto fail;
}
curwp->w_dotp = tlp;
curwp->w_doto = tbo;
curwp->w_flag |= WFMOVE;
return (TRUE);
}
fail: ;
}
}
/*
* Compare two characters.
* The "bc" comes from the buffer.
* It has its case folded out. The
* "pc" is from the pattern.
*/
eq(bc, pc) {
register int ibc;
register int ipc;
ibc = bc & 0xFF;
ipc = pc & 0xFF;
if (ISLOWER(ibc) != FALSE)
ibc = TOUPPER(ibc);
if (ISLOWER(ipc) != FALSE)
ipc = TOUPPER(ipc);
if (ibc == ipc)
return (TRUE);
return (FALSE);
}
/*
* Read a pattern.
* Stash it in the external variable "pat". The "pat" is
* not updated if the user types in an empty line. If the user typed
* an empty line, and there is no old pattern, it is an error.
* Display the old pattern, in the style of Jeff Lomicka. There is
* some do-it-yourself control expansion.
*/
readpattern(prompt) char *prompt; {
register int s;
char tpat[NPAT];
if (tpat[0] == '\0') s = ereply("%s: ", tpat, NPAT, prompt);
else s = ereply("%s: (default %s) ", tpat, NPAT, prompt, pat);
if (s == TRUE) /* Specified */
(VOID) strcpy(pat, tpat);
else if (s==FALSE && pat[0]!=0) /* CR, but old one */
s = TRUE;
return (s);
}