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/* exsubst.c */
/* Copyright 1995 by Steve Kirkendall */
/* This file contains code which implements the :s command. The most
* challenging variation of that command is the interactive form -- specified
* via the 'c' flag. Because elvis is event driven, the only way to implement
* this is via a whole new edit mode which interprets <y> as a command to
* replace-and-search, and most other keystrokes as a search command (without
* replacing). The :s command itself will simply set this up, push the
* input state onto the stack, and return.
*
* On the other hand, non-interactive versions need to return a "failed"
* exit status if there is no match, so we can't simply run the interactive
* code with simulated <y> keystrokes. We need to have a separate version of
* the search-and-replace loop.
*
* In this file, we have a "findnext" function and a "dosubst" function.
* These are used by the non-interactive :s command, and the interactive
* version's key processor -- both of which are also in this file.
*/
#include "elvis.h"
#ifdef FEATURE_RCSID
char id_exsubst[] = "$Id: exsubst.c,v 2.22 2003/10/17 17:41:23 steve Exp $";
#endif
typedef struct
{
/* THE FOLLOWING ARE RETAINED BETWEEN SEARCHES */
/* old text and new text */
regexp *re; /* text to search for */
CHAR *rplc; /* replacement text */
/* options */
PFLAG pflag; /* printing flag */
ELVBOOL global; /* boolean: substitute globally in line? */
ELVBOOL execute; /* boolean: execute instead of substitute? */
ELVBOOL confirm; /* boolean: ask for confirmation first? */
ELVBOOL errors; /* boolean: is a failed search an error? */
long instance;/* numeric: which instance in each line to sub */
/* THE FOLLOWING ARE RESET FOR EACH SEARCH */
/* range of lines to check */
WINDOW win; /* window */
MARK from; /* current line */
MARK to; /* end of last line to check */
/* intermediate results */
long thisinst;/* instance of current match within current line */
CHAR key; /* keystroke */
long printoff;/* offset of line to be printed, or -1 */
/* results */
long chline; /* # of lines changed */
long chsub; /* # of substitutions made */
long cursoff;/* offset of last change, so cursor can be left there */
ELVBOOL ex; /* revert to ex mode afterward? */
} subst_t;
static void print P_((subst_t *subst));
static ELVBOOL findnext P_((subst_t *subst));
static ELVBOOL dosubst P_((WINDOW win, subst_t *subst));
static RESULT parse P_((_CHAR_ key, void *info));
static RESULT perform P_((WINDOW win));
static ELVCURSOR shape P_((WINDOW win));
/* Print the line containing the most recent change. This is used when the
* :s command is invoked with print flags.
*/
static void print(subst)
subst_t *subst;
{
MARK pline;
long fromoff;
/* If supposed to print, then do so */
if (subst->pflag == PF_NONE)
return;
/* Find the start of the line to be printed. If 'printoff' is >= 0
* then use it as the the starting point; else use the from field.
*/
if (subst->printoff >= 0)
{
fromoff = markoffset(subst->from);
marksetoffset(subst->from, subst->printoff);
pline = (*subst->win->md->move)(subst->win,
subst->from, 0L, 0L, ElvFalse);
marksetoffset(subst->from, fromoff);
subst->printoff = -1L;
}
else
{
pline = (*subst->win->md->move)(subst->win,
subst->from, 0L, 0L, ElvFalse);
}
/* print the line */
exprintlines(subst->win, pline, 1L, subst->pflag);
}
/* Find the next matching instance for a given substitution. If one is found,
* return ElvTrue; else return ElvFalse. When a match is found, the contents of
* the subst argument are modified to reflect its location. In particular,
* subst->re->startp[0] gives its start offset, and subst->re->end[0] gives
* its end offset.
*/
static ELVBOOL findnext(subst)
subst_t *subst; /* info about the substitution */
{
/* if previous line was supposed to be printed but hasn't been,
* then print it now.
*/
if (subst->printoff >= 0)
print(subst);
/* for each line remaining in the range... */
while (markoffset(subst->from) < markoffset(subst->to))
{
/* if the user is impatient, then stop */
if (guipoll(ElvFalse))
return ElvFalse;
/* for each instance within the line... */
while (regexec(subst->re, subst->from, (ELVBOOL)(subst->thisinst == 0))
&& (subst->global || subst->thisinst < subst->instance))
{
/* increment the instance counter */
subst->thisinst++;
/* if this is an instance we care about... */
if (subst->global || subst->thisinst == subst->instance)
{
/* prepare for next loop */
if (subst->global)
{
marksetoffset(subst->from,
subst->re->endp[0]);
/* For global substitutions, we need to
* be careful about regexps which can
* match zero-length text. Specifically,
* we need to require at least one
* non-matching character between
* matches, otherwise we'd just get in
* an infinite loop replacing nothing
* with something at the same location.
*/
if (subst->re->minlen == 0)
{
if (scanchar(subst->from) == '\n')
subst->thisinst = 0;
markaddoffset(subst->from, 1L);
}
}
else /* single instance in each line */
{
/* remember that we'll need to print
* this line after the substitution.
*/
subst->printoff = markoffset(subst->from);
/* Increment the chline counter */
subst->chline++;
/* move to start of the next line */
marksetoffset(subst->from,
subst->re->nextlinep);
subst->thisinst = 0;
}
/* Return ElvTrue to do substitution */
return ElvTrue;
}
/* Move "posn" to the end of the matched region. If
* the regexp could conceivably match a zero-length
* string, then skip one character.
*/
marksetoffset(subst->from, subst->re->endp[0]);
if (subst->re->minlen == 0)
{
markaddoffset(subst->from, 1);/*!!!*/
if (scanchar(subst->from) == '\n')
break;
}
}
/* if any matches were found, then increment chline */
if (subst->global ? subst->thisinst > 0 : subst->thisinst == subst->instance)
{
subst->chline++;
/* print the changed line, if we're supposed to */
print(subst);
}
/* move forward to the start of the next line */
marksetoffset(subst->from, subst->re->nextlinep);
subst->thisinst = 0L;
}
/* if last line was supposed to be printed but hasn't been,
* then print it now.
*/
if (subst->printoff >= 0)
print(subst);
return ElvFalse;
}
/* Perform a substitution, or if subst->execute is ElvTrue then execute the
* text which would have been substituted. Returns ElvTrue if successful, or
* ElvFalse if there is an error in the replacement text.
*/
static ELVBOOL dosubst(win, subst)
WINDOW win;
subst_t *subst; /* info about the substitution */
{
CHAR *newtext;
MARK oldcursor;
MARK cursor;
ELVBOOL oldsaveregexp;
/* remember the offset of this change so we can move the cursor later */
subst->cursoff = subst->re->startp[0];
/* Either execute the replacement, or perform the substitution */
newtext = regsub(subst->re, subst->rplc, (ELVBOOL)!subst->execute);
if (!newtext)
{
return ElvFalse;
}
if (subst->execute)
{
/* move the window's cursor to the matching line */
if (win)
{
assert(subst->re->buffer == markbuffer(subst->from));
if (win->state->pop)
cursor = win->state->pop->cursor;
else
cursor = win->cursor;
oldcursor = markdup(cursor);
marksetoffset(cursor, subst->re->startp[0]);
marksetbuffer(cursor, subst->re->buffer);
bufoptions(subst->re->buffer);
}
else
cursor = oldcursor = NULL;
/* temporarily turn off the saveregexp option */
oldsaveregexp = o_saveregexp;
#if 0
o_saveregexp = ElvFalse;
#endif
/* execute the command */
exstring(win, newtext, NULL);
/* restore the saveregexp option */
o_saveregexp = oldsaveregexp;
/* move the cursor back where it was before */
if (oldcursor)
{
marksetoffset(cursor, markoffset(oldcursor));
marksetbuffer(cursor, markbuffer(oldcursor));
markfree(oldcursor);
}
}
safefree(newtext);
/* increment the substitution change counter */
subst->chsub++;
return ElvTrue;
}
/* If key is <Esc> then cancel the change. If <n> or <N> then skip this change
* but continue to the next match. Any other key performs the substitution and
* continues to the next match.
*/
static RESULT parse(key, info)
_CHAR_ key;
void *info;
{
subst_t *subst = (subst_t *)info;
WINDOW win;
#ifdef FEATURE_V
VIINFO vinf;
/* unhighlight the previous match */
vinf.command = ELVCTRL('[');
v_visible(subst->win, &vinf);
#endif
/* be lenient about keystrokes */
if (key == 'N' || key == 'n')
key = 'n';
else if (key == ELVCTRL('[') || key == ELVCTRL('C'))
key = ELVCTRL('[');
else
key = 'y';
/* do the required steps */
switch (key)
{
case 'y':
/* perform this substitution */
if (!dosubst(subst->win, subst))
{
markbuffer(subst->win->cursor)->willdo = ElvFalse;
return RESULT_ERROR;
}
/* fall through... */
case 'n':
/* find the next match */
if (findnext(subst))
{
#ifdef FEATURE_V
/* highlight the next match */
if (subst->re->endp[0] > subst->re->startp[0])
{
marksetoffset(subst->win->cursor, subst->re->endp[0] - 1);
vinf.command = 'v';
v_visible(subst->win, &vinf);
marksetoffset(subst->win->cursor, subst->re->startp[0]);
v_visible(subst->win, NULL);
}
else /* matching text is 0 characters long */
#endif /* FEATURE_V */
{
/* at least move the cursor there */
marksetoffset(subst->win->cursor, subst->re->startp[0]);
}
return RESULT_MORE;
}
}
/* Either the user canceled or there are no other matches, so we're
* done. Announce the results.
*/
if ((subst->chline >= o_report && o_report != 0) || subst->confirm)
{
msg(MSG_INFO, "[dd]$1 substitutions on $2 lines", subst->chsub, subst->chline);
}
/* Free the marks. */
markfree(subst->from);
markfree(subst->to);
safefree(subst->rplc);
#ifdef FEATURE_AUTOCMD
markbuffer(subst->win->cursor)->eachedit = ElvFalse;
#endif
/* Either pop the confirm state (if we started it from visual mode)
* or replace the confirm state with an ex state (if we started from
* ex mode).
*/
if (subst->ex)
{
/* Pop off the "confirm" state right away, and them push an
* "ex" stratum.
*/
win = subst->win;
statepop(win);
statestratum(win, toCHAR(EX_BUF), ':', exenter);
win->state->flags &= ~(ELVIS_POP|ELVIS_ONCE|ELVIS_1LINE);
}
else
{
/* Pop off the "confirm" state so we return to the "vi" state */
subst->win->state->flags |= ELVIS_POP;
}
return RESULT_COMPLETE;
}
static RESULT perform(win)
WINDOW win;
{
return RESULT_COMPLETE;
}
/* Choose a cursor shape to use during confirmation */
static ELVCURSOR shape(win)
WINDOW win;
{
regexp *re = ((subst_t *)win->state->info)->re;
return re->startp[0] == re->endp[0] ? CURSOR_INSERT : CURSOR_REPLACE;
}
/* This function implements the :substitute command, and the :& and :~
* variations of that command. It is also used to perform the real work
* of the visual <&> command.
*/
RESULT ex_substitute(xinf)
EXINFO *xinf;
{
static subst_t prev; /* previous substitution info */
subst_t subst; /* current substitution info */
CHAR *opt; /* substitution options */
long count; /* numeric option: which instance in each line to sub */
BUFFER buf;
STATE *state, *s;
#ifdef FEATURE_V
VIINFO vinf;
#endif
assert(xinf->command == EX_SUBSTITUTE
|| xinf->command == EX_SUBAGAIN
|| xinf->command == EX_SUBRECENT);
/* if invoked via visual <&> command, or not edcompatible, then reset */
subst = prev;
memset(&prev, 0, sizeof prev);
if (!o_edcompatible || xinf->bang)
{
subst.pflag = xinf->pflag;
subst.global = ElvFalse;
subst.execute = ElvFalse;
subst.confirm = ElvFalse;
subst.errors = ElvTrue;
subst.instance = 0;
}
else if (xinf->pflag != PF_NONE)
subst.pflag = xinf->pflag;
/* parse arguments */
count = 0;
if (xinf->command == EX_SUBAGAIN
|| (xinf->command == EX_SUBSTITUTE && !xinf->re))
{
/* use the same regexp as the previous :s command */
if (!subst.re)
{
msg(MSG_ERROR, "no previous regular expression");
return RESULT_ERROR;
}
/* same replacement text as last time */
subst.rplc = regtilde(toCHAR(o_magic ? "~" : "\\~"));
}
else if (xinf->command == EX_SUBRECENT)
{
/* use the most recent regular expression */
if (subst.re)
safefree(subst.re);
prev.re = NULL;
subst.re = regcomp(toCHAR(""), xinf->window->state->cursor);
if (!subst.re)
{
/* error message already given by regcomp() */
return RESULT_ERROR;
}
/* same replacement text as last time */
subst.rplc = regtilde(toCHAR(o_magic ? "~" : "\\~"));
}
else /* xinf->command == CMD_SUBSTITUTE */
{
/* use the new regexp */
if (subst.re)
safefree(subst.re);
prev.re = NULL;
subst.re = xinf->re;
xinf->re = NULL; /* so it isn't clobbered after this cmd */
/* generate the new text */
subst.rplc = regtilde(xinf->lhs ? xinf->lhs : toCHAR(""));
}
/* analyse the option string */
for (opt = xinf->rhs; opt && *opt; opt++)
{
switch (*opt)
{
case 'g':
subst.global = (ELVBOOL)!subst.global;
break;
case 'x':
subst.execute = (ELVBOOL)!subst.execute;
break;
case 'c':
subst.confirm = (ELVBOOL)!subst.confirm;
break;
case 'e':
subst.errors = (ELVBOOL)!subst.errors;
break;
case 'p':
subst.pflag = (subst.pflag==PF_PRINT) ? PF_NONE : PF_PRINT;
break;
case 'l':
subst.pflag = (subst.pflag==PF_LIST) ? PF_NONE : PF_LIST;
break;
case '#':
subst.pflag = (subst.pflag==PF_NUMBER) ? PF_NONE : PF_NUMBER;
break;
case '.':
subst.instance = 0;
opt++;
do
{
subst.instance *= 10;
subst.instance += *opt++ - '0';
} while (elvdigit(*opt));
opt--;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
count = 0;
do
{
count = count * 10 + *opt++ - '0';
} while (elvdigit(*opt));
opt--;
break;
default:
if (!elvspace(*opt))
{
msg(MSG_ERROR, "[C]unsupported flag '$1'", *opt);
return RESULT_ERROR;
}
}
}
/* sanity checks */
if (subst.instance != 0 && subst.global)
{
msg(MSG_ERROR, "[d]can't mix instance number .$1 and g flag", subst.instance);
return RESULT_ERROR;
}
buf = markbuffer(xinf->fromaddr);
if (subst.confirm && buf != markbuffer(xinf->window->cursor))
{
msg(MSG_ERROR, "the c flag only works on the window's main edit buffer");
return RESULT_ERROR;
}
if (subst.confirm && !xinf->window)
{
msg(MSG_ERROR, "the c flag is only available from a window");
return RESULT_ERROR;
}
/* can't mix 'c' flag with a print flag - and don't really need to */
if (subst.confirm)
subst.pflag = PF_NONE;
/* If count>0 then adjust the "xinf->to" mark */
if (count > 0)
{
xinf->to = xinf->from + count - 1L;
if (xinf->to == o_buflines(markbuffer(&xinf->defaddr)))
marksetoffset(xinf->toaddr,
o_bufchars(markbuffer(&xinf->defaddr)));
else
marksetoffset(xinf->toaddr,
lowline(bufbufinfo(markbuffer(xinf->toaddr)), xinf->to + 1));
}
/* default behavior is to either replace only first instance,
* or all instances, depending on the "gdefault" option.
*/
if (subst.instance == 0 && !subst.global)
{
if (o_gdefault && !o_edcompatible)
subst.global = ElvTrue;
else
subst.instance = 1;
}
/* remember the flags, unless "saveregexp" is off */
if (o_saveregexp)
{
prev = subst;
prev.re = regdup(prev.re);
}
/* if no replacement text, fail */
if (!subst.rplc)
{
return RESULT_ERROR;
}
/* this command does its own printing; disable auto printing */
xinf->pflag = PF_NONE;
/* reset the change counters */
subst.chline = subst.chsub = 0L;
/* make a local copy of replacement string */
subst.rplc = CHARdup(subst.rplc);
/* make the scanned buffer be the one used by this window */
bufoptions(buf);
#ifdef FEATURE_AUTOCMD
/* we want to trigger Edit events for change, even though we only save
* an undo version before the first change.
*/
buf->eachedit = ElvTrue;
#endif
/* for each line in the range... */
subst.from = markdup(xinf->fromaddr);
subst.to = markdup(xinf->toaddr);
subst.thisinst = 0;
subst.printoff = -1;
subst.win = xinf->window;
if (subst.confirm)
{
if (findnext(&subst))
{
/* insert a state between "ex" and "vi" input
* states. The new state should be in the same
* stratum as "vi". Since there is no state
* function for inserting states this way, we
* do it by temporarily removing the "ex" state,
* pushing the new one, and then putting "ex"
* back again.
*/
state = subst.win->state;
subst.win->state = subst.win->state->pop;
statepush(subst.win, subst.win->state->flags & ~ELVIS_ONCE);
if (state->acton == subst.win->state->pop)
state->acton = subst.win->state;
state->pop = subst.win->state;
subst.win->state = state;
/* Use the same cursor, top & bottom marks as
* higher "vi" state. Move them to the match.
*/
state = subst.win->state->pop;
marksetoffset(state->cursor, subst.re->startp[0]);
marksetoffset(state->top, subst.re->startp[0]);
marksetoffset(state->bottom, subst.re->endp[0]);
/* If ex mode (not visual <:> command), then we need
* to be clever here: We need to exit ex mode while
* the substitution is taking place, and then return
* to it again afterward.
*/
if ((subst.win->state->flags & (ELVIS_1LINE|ELVIS_ONCE|ELVIS_POP)) == 0)
{
/* exit "ex" mode */
for (s = xinf->window->state;
s != xinf->window->state->acton;
s = s->pop)
s->flags |= ELVIS_1LINE;
/* force main edit state use use bottom line */
for (; s; s = s->pop)
s->flags |= ELVIS_BOTTOM;
/* remember to switch back later */
subst.ex = ElvTrue;
}
/* initialize the remaining fields of the state */
state->enter = NULL;
state->perform = perform;
state->parse = parse;
state->shape = shape;
state->info = safealloc(1, sizeof(subst_t));
*((subst_t *)state->info) = subst;
state->modename = "Yes/No";
#ifdef FEATURE_V
/* highlight the first match */
if (subst.re->endp[0] > subst.re->startp[0])
{
marksetoffset(subst.win->cursor, subst.re->endp[0] - 1);
vinf.command = 'v';
v_visible(subst.win, &vinf);
marksetoffset(subst.win->cursor, subst.re->startp[0]);
v_visible(subst.win, NULL);
}
else /* matching text is 0 characters long */
#endif
{
/* at least move the cursor there */
marksetoffset(subst.win->cursor, subst.re->startp[0]);
}
marksetoffset(subst.win->state->top, markoffset(subst.win->cursor));
/* Well, we started successfully */
return RESULT_COMPLETE;
}
/* free the marks & stuff -- we failed */
markfree(subst.from);
markfree(subst.to);
safefree(subst.rplc);
#ifdef FEATURE_AUTOCMD
buf->eachedit = ElvFalse;
#endif
return RESULT_ERROR;
}
else /* non-interactive */
{
/* do all the substitutions now */
while (findnext(&subst))
if (!dosubst(xinf->window, &subst))
{
markfree(subst.from);
markfree(subst.to);
safefree(subst.rplc);
#ifdef FEATURE_AUTOCMD
buf->eachedit = ElvFalse;
#endif
return RESULT_ERROR;
}
/* Free the marks. */
markfree(subst.from);
markfree(subst.to);
safefree(subst.rplc);
}
#ifdef FEATURE_AUTOCMD
buf->eachedit = ElvFalse;
#endif
/* If used with "e", then finish silently and never cause an error */
if (!subst.errors)
return RESULT_COMPLETE;
/* if used with "x" flag", or if ":set report=0" then finish silently */
if (subst.execute || o_report == 0)
return subst.chsub > 0 ? RESULT_COMPLETE : RESULT_ERROR;
/* Reporting */
if (subst.chsub == 0)
msg(MSG_WARNING, "substitution failed");
else if (subst.chline >= o_report)
msg(MSG_INFO, "[dd]$1 substitutions on $2 lines", subst.chsub, subst.chline);
/* leave the cursor at the location of the last change */
if (subst.chsub > 0)
{
xinf->newcurs = markalloc(markbuffer(xinf->window->cursor), subst.cursoff);
/* try to avoid leaving cursor on a newline */
if (subst.cursoff > 0L && scanchar(xinf->newcurs) == '\n')
{
markaddoffset(xinf->newcurs, -1L);
if (scanchar(xinf->newcurs) == '\n')
markaddoffset(xinf->newcurs, 1L);
}
return RESULT_COMPLETE;
}
return RESULT_ERROR;
}
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