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zsh/Src/Zle/compmatch.c
Peter Stephenson 997ea719e4 21402: Fix crash with case-insensitive matching.
2005-07-06 10:06:42 +00:00

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/*
* compmatch.c - the complete module, completion matching code
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1999 Sven Wischnowsky
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Sven Wischnowsky or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Sven Wischnowsky and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Sven Wischnowsky and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Sven Wischnowsky and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "complete.mdh"
#include "compmatch.pro"
/* This compares two cpattern lists and returns non-zero if they are
* equal. */
/**/
static int
cmp_cpatterns(Cpattern a, Cpattern b)
{
while (a) {
if (a->equiv != b->equiv || memcmp(a->tab, b->tab, 256))
return 0;
a = a->next;
b = b->next;
}
return 1;
}
/* This compares two cmatchers and returns non-zero if they are equal. */
/**/
static int
cmp_cmatchers(Cmatcher a, Cmatcher b)
{
return (a == b ||
(a->flags == b->flags &&
a->llen == b->llen && a->wlen == b->wlen &&
(!a->llen || cmp_cpatterns(a->line, b->line)) &&
(a->wlen <= 0 || cmp_cpatterns(a->word, b->word)) &&
(!(a->flags & (CMF_LEFT | CMF_RIGHT)) ||
(a->lalen == b->lalen && a->ralen == b->ralen &&
(!a->lalen || cmp_cpatterns(a->left, b->left)) &&
(!a->ralen || cmp_cpatterns(a->right, b->right))))));
}
/* Add the given matchers to the bmatcher list. */
/**/
mod_export void
add_bmatchers(Cmatcher m)
{
Cmlist old = bmatchers, *q = &bmatchers, n;
for (; m; m = m->next) {
if ((!m->flags && m->wlen > 0 && m->llen > 0) ||
(m->flags == CMF_RIGHT && m->wlen < 0 && !m->llen)) {
*q = n = (Cmlist) zhalloc(sizeof(struct cmlist));
n->matcher = m;
q = &(n->next);
}
}
*q = old;
}
/* This is called when the matchers in the mstack have changed to
* ensure that the bmatchers list contains no matchers not in mstack. */
/**/
mod_export void
update_bmatchers(void)
{
Cmlist p = bmatchers, q = NULL, ms;
Cmatcher mp;
int t;
while (p) {
t = 0;
for (ms = mstack; ms && !t; ms = ms->next)
for (mp = ms->matcher; mp && !t; mp = mp->next)
t = cmp_cmatchers(mp, p->matcher);
p = p->next;
if (!t) {
if (q)
q->next = p;
else
bmatchers = p;
}
}
}
/* This returns a new Cline structure. */
/**/
Cline
get_cline(char *l, int ll, char *w, int wl, char *o, int ol, int fl)
{
Cline r;
/* Prefer to take it from the buffer list (freecl), if there
* is none, allocate a new one. */
if ((r = freecl))
freecl = r->next;
else
r = (Cline) zhalloc(sizeof(*r));
r->next = NULL;
r->line = l; r->llen = ll;
r->word = w; r->wlen = wl;
r->orig = o; r->olen = ol;
r->slen = 0;
r->flags = fl;
r->prefix = r->suffix = NULL;
r->min = r->max = 0;
return r;
}
/* This frees a cline list. */
/**/
void
free_cline(Cline l)
{
Cline n;
while (l) {
n = l->next;
l->next = freecl;
freecl = l;
free_cline(l->prefix);
free_cline(l->suffix);
l = n;
}
}
/* Copy a cline list. */
/**/
Cline
cp_cline(Cline l, int deep)
{
Cline r = NULL, *p = &r, t, lp = NULL;
while (l) {
if ((t = freecl))
freecl = t->next;
else
t = (Cline) zhalloc(sizeof(*t));
memcpy(t, l, sizeof(*t));
if (deep) {
if (t->prefix)
t->prefix = cp_cline(t->prefix, 0);
if (t->suffix)
t->suffix = cp_cline(t->suffix, 0);
}
*p = lp = t;
p = &(t->next);
l = l->next;
}
*p = NULL;
return r;
}
/* Calculate the length of a cline and its sub-lists. */
/**/
int
cline_sublen(Cline l)
{
int len = ((l->flags & CLF_LINE) ? l->llen : l->wlen);
if (l->olen && !((l->flags & CLF_SUF) ? l->suffix : l->prefix))
len += l->olen;
else {
Cline p;
for (p = l->prefix; p; p = p->next)
len += ((p->flags & CLF_LINE) ? p->llen : p->wlen);
for (p = l->suffix; p; p = p->next)
len += ((p->flags & CLF_LINE) ? p->llen : p->wlen);
}
return len;
}
/* Set the lengths in the cline lists. */
/**/
void
cline_setlens(Cline l, int both)
{
while (l) {
l->min = cline_sublen(l);
if (both)
l->max = l->min;
l = l->next;
}
}
/* This sets the CLF_MATCHED flag in the given clines. */
/**/
void
cline_matched(Cline p)
{
while (p) {
p->flags |= CLF_MATCHED;
cline_matched(p->prefix);
cline_matched(p->suffix);
p = p->next;
}
}
/* This reverts the order of the elements of the given cline list and
* returns a pointer to the new head. */
/**/
Cline
revert_cline(Cline p)
{
Cline r = NULL, n;
while (p) {
n = p->next;
p->next = r;
r = p;
p = n;
}
return r;
}
/* Global variables used during matching: a char-buffer for the string to
* use for the match, and two cline lists for the two levels we use. */
/**/
char *matchbuf = NULL;
/**/
int matchbuflen = 0, matchbufadded;
/**/
Cline matchparts, matchlastpart;
/**/
Cline matchsubs, matchlastsub;
/* This initialises the variables above. */
/**/
static void
start_match(void)
{
if (matchbuf)
*matchbuf = '\0';
matchbufadded = 0;
matchparts = matchlastpart = matchsubs = matchlastsub = NULL;
}
/* This aborts a matching, freeing the cline lists build. */
/**/
static void
abort_match(void)
{
free_cline(matchparts);
free_cline(matchsubs);
matchparts = matchsubs = NULL;
}
/* This adds a new string in the static char buffer. The arguments are
* the matcher used (if any), the strings from the line and the word
* and the length of the string from the word. The last argument is
* non-zero if we are matching a suffix (where the given string has to
* be prepended to the contents of the buffer). */
/**/
static void
add_match_str(Cmatcher m, char *l, char *w, int wl, int sfx)
{
/* Get the string and length to insert: either from the line
* or from the match. */
if (m && (m->flags & CMF_LINE)) {
wl = m->llen; w = l;
}
if (wl) {
/* Probably resize the buffer. */
if (matchbuflen - matchbufadded <= wl) {
int blen = matchbuflen + wl + 20;
char *buf;
buf = (char *) zalloc(blen);
memcpy(buf, matchbuf, matchbuflen);
zfree(matchbuf, matchbuflen);
matchbuf = buf;
matchbuflen = blen;
}
/* Insert the string. */
if (sfx) {
memmove(matchbuf + wl, matchbuf, matchbufadded + 1);
memcpy(matchbuf, w, wl);
} else
memcpy(matchbuf + matchbufadded, w, wl);
matchbufadded += wl;
matchbuf[matchbufadded] = '\0';
}
}
/* This adds a cline for a word-part during matching. Arguments are the
* matcher used, pointers to the line and word strings for the anchor,
* a pointer to the original line string for the whole part, the string
* before (or after) the anchor that has not yet been added, the length
* of the line-string for that, and a flag saying if we are matching a
* suffix. */
/**/
static void
add_match_part(Cmatcher m, char *l, char *w, int wl,
char *o, int ol, char *s, int sl, int osl, int sfx)
{
Cline p, lp;
/* If the anchors are equal, we keep only one. */
if (l && !strncmp(l, w, wl))
l = NULL;
/* Split the new part into parts and turn the last one into a
* `suffix' if we have a left anchor. */
p = bld_parts(s, sl, osl, &lp);
if (m && (m->flags & CMF_LEFT)) {
lp->flags |= CLF_SUF;
lp->suffix = lp->prefix;
lp->prefix = NULL;
}
/* cline lists for suffixes are sorted from back to front, so we have
* to revert the list we got. */
if (sfx)
p = revert_cline(lp = p);
/* Now add the sub-clines we already had. */
if (matchsubs) {
if (sfx) {
Cline q;
if ((q = lp->prefix)) {
while (q->next)
q = q->next;
q->next = matchsubs;
} else
lp->prefix = matchsubs;
matchlastsub->next = NULL;
} else {
matchlastsub->next = p->prefix;
p->prefix = matchsubs;
}
matchsubs = matchlastsub = NULL;
}
/* Store the arguments in the last part-cline. */
if (lp->llen || lp->wlen) {
lp->next = get_cline(l, wl, w, wl, o, ol, CLF_NEW);
lp = lp->next;
} else {
lp->line = l; lp->llen = wl;
lp->word = w; lp->wlen = wl;
lp->orig = o; lp->olen = ol;
}
if (o || ol)
lp->flags &= ~CLF_NEW;
/* Finally, put the new parts on the list. */
if (matchlastpart)
matchlastpart->next = p;
else
matchparts = p;
matchlastpart = lp;
}
/* This adds a new sub-cline. Arguments are the matcher and the strings from
* the line and the word. */
/**/
static void
add_match_sub(Cmatcher m, char *l, int ll, char *w, int wl)
{
int flags;
Cline n;
/* Check if we are interested only in the string from the line. */
if (m && (m->flags & CMF_LINE)) {
w = NULL; wl = 0;
flags = CLF_LINE;
} else
flags = 0;
/* And add the cline. */
if (wl || ll) {
Cline p, lp;
if ((p = n = bld_parts(w, wl, ll, &lp)) && n != lp) {
for (; p->next != lp; p = p->next);
if (matchsubs) {
matchlastsub->next = n->prefix;
n->prefix = matchsubs;
}
matchsubs = matchlastsub = lp;
if (matchlastpart)
matchlastpart->next = n;
else
matchparts = n;
p->next = 0;
matchlastpart = p;
} else {
n = get_cline(l, ll, w, wl, NULL, 0,
flags | ((m && m->wlen == -2) ? CLF_SKIP : 0));
if (matchlastsub)
matchlastsub->next = n;
else
matchsubs = n;
matchlastsub = n;
}
}
}
/* This tests if the string from the line l matches the word w. In bp
* the offset for the brace is returned, in rwlp the length of the
* matched prefix or suffix, not including the stuff before or after
* the last anchor is given. When sfx is non-zero matching is done from
* the ends of the strings backward, if test is zero, the global variables
* above are used to build the string for the match and the cline. If
* part is non-zero, we are satisfied if only a part of the line-string
* is used (and return the length used). */
/**/
int
match_str(char *l, char *w, Brinfo *bpp, int bc, int *rwlp,
int sfx, int test, int part)
{
int ll = strlen(l), lw = strlen(w), oll = ll, olw = lw, exact = 0, wexact = 0;
int il = 0, iw = 0, t, ind, add, he = 0, bpc, obc = bc, bslash;
VARARR(unsigned char, ea, (ll > lw ? ll : lw) + 1);
char *ow;
Cmlist ms;
Cmatcher mp, lm = NULL;
Brinfo bp = NULL;
if (!test) {
start_match();
bp = *bpp;
}
/* Adjust the pointers and get the values for subscripting and
* incrementing. */
if (sfx) {
l += ll; w += lw;
ind = -1; add = -1;
} else {
ind = 0; add = 1;
}
/* ow will always point to the beginning (or end) of that sub-string
* in w that wasn't put in the match-variables yet. */
ow = w;
/* If the brace is at the beginning, we have to treat it now. */
if (!test && bp && bc >= bp->pos) {
bp->curpos = bc;
bp = bp->next;
}
/*** This once was: `while (ll && lw)', but then ignored characters at
* the end were not, well, ignored. */
while (ll) {
/* Hm, we unconditionally first tried the matchers for the cases
* where the beginnings of the line and word patterns match the
* same character(s).
* But first testing if the characters are the same is sooo
* much faster...
* Maybe it's OK to make same-character matching be preferred in
* recursive calls. At least, it /seems/ to work.
*
* Let's try.
*
* Update: this once tested `test && ...' to check for exact
* character matches only in recursive calls. But then one
* can't complete `nom<TAB>' to `nomatch' with a match spec
* of `B:[nN][oO]=' because that will eat the `no'.
* But that would break completion of strings like `nonomatch'
* because the `B:[nN][oO]=' doesn't match the second `no'.
* For this we added the code below that can remove already
* accepted exact characters and try again, preferring match
* specs.
*/
bslash = 0;
if (!sfx && lw && (!part || test) &&
(l[ind] == w[ind] ||
(bslash = (lw > 1 && w[ind] == '\\' &&
(ind ? (w[0] == l[0]) : (w[1] == l[0])))))) {
/* No matcher could be used, but the strings have the same
* character here, skip over it. */
l += add; w += (bslash ? (add + add) : add);
il++; iw += 1 + bslash;
ll--; lw -= 1 + bslash;
bc++;
exact++;
wexact += 1 + bslash;
if (!test)
while (bp && bc >= (useqbr ? bp->qpos : bp->pos)) {
bp->curpos = matchbufadded + (sfx ? (ow - w) : (w - ow)) + obc;
bp = bp->next;
}
lm = NULL;
he = 0;
continue;
}
retry:
/* First try the matchers. Err... see above. */
for (mp = NULL, ms = mstack; !mp && ms; ms = ms->next) {
for (mp = ms->matcher; mp; mp = mp->next) {
t = 1;
if ((lm && lm == mp) ||
((oll == ll || olw == lw) &&
(test == 1 || (test && !mp->left && !mp->right)) &&
mp->wlen < 0))
/* If we were called recursively, don't use `*' patterns
* at the beginning (avoiding infinite recursion). */
continue;
if (mp->wlen < 0) {
int both, loff, aoff, llen, alen, zoff, moff, ct, ict, aol;
char *tp, savl = '\0', savw;
Cpattern ap, aop;
/* This is for `*' patterns, first initialise some
* local variables. */
llen = mp->llen;
if (mp->flags & CMF_LEFT) {
alen = mp->lalen; aol = mp->ralen;
} else {
alen = mp->ralen; aol = mp->lalen;
}
/* Give up if we don't have enough characters for the
* line-string and the anchor. */
if (ll < llen + alen || lw < alen)
continue;
if (mp->flags & CMF_LEFT) {
ap = mp->left; zoff = 0; moff = alen; aop = mp->right;
if (sfx) {
both = 0; loff = -llen; aoff = -(llen + alen);
} else {
both = 1; loff = alen; aoff = 0;
}
} else {
ap = mp->right; zoff = alen; moff = 0; aop = mp->left;
if (sfx) {
both = 1; loff = -(llen + alen); aoff = -alen;
} else {
both = 0; loff = 0; aoff = llen;
}
}
/* Try to match the line pattern and the anchor. */
if (!pattern_match(mp->line, l + loff, NULL, NULL))
continue;
if (ap) {
if (!pattern_match(ap, l + aoff, NULL, NULL) ||
(both &&
(!pattern_match(ap, w + aoff, NULL, NULL) ||
(aol && aol <= aoff + iw &&
!pattern_match(aop, w + aoff - aol,
NULL, NULL)) ||
!match_parts(l + aoff, w + aoff, alen, part))))
continue;
} else if (!both || ((mp->flags & CMF_INTER) ?
((mp->flags & CMF_LINE) ? iw : il) :
(il || iw)))
continue;
/* Fine, now we call ourselves recursively to find the
* string matched by the `*'. */
if (sfx && (savl = l[-(llen + zoff)]))
l[-(llen + zoff)] = '\0';
for (t = 0, tp = w, ct = 0, ict = lw - alen + 1;
ict;
tp += add, ct++, ict--) {
if ((both &&
(!ap || !test ||
!pattern_match(ap, tp + aoff, NULL, NULL) ||
(aol && aol <= aoff + ct + iw &&
!pattern_match(aop, tp + aoff - aol,
NULL, NULL)))) ||
(!both &&
pattern_match(ap, tp - moff, NULL, NULL) &&
(!aol || (aol <= iw + ct - moff &&
pattern_match(aop, tp - moff - aol,
NULL, NULL))) &&
(mp->wlen == -1 ||
match_parts(l + aoff , tp - moff,
alen, part)))) {
if (!both && mp->wlen == -1 &&
!match_parts(l + aoff , tp - moff, alen, part))
break;
if (sfx) {
if ((savw = tp[-zoff]))
tp[-zoff] = '\0';
t = match_str(l - ll, w - lw,
NULL, 0, NULL, 1, 2, part);
if (savw)
tp[-zoff] = savw;
} else
t = match_str(l + llen + moff, tp + moff,
NULL, 0, NULL, 0, 1, part);
if (t || (mp->wlen == -1 && !both))
break;
}
}
ict = ct;
if (sfx && savl)
l[-(llen + zoff)] = savl;
/* Have we found a position in w where the rest of l
* matches? */
if (!t)
continue;
/* Yes, add the strings and clines if this is a
* top-level call. */
if (!test && (!he || (llen + alen))) {
char *op, *lp, *map, *wap, *wmp;
int ol;
if (sfx) {
op = w; ol = ow - w; lp = l - (llen + alen);
map = tp - alen;
if (mp->flags & CMF_LEFT) {
wap = tp - alen; wmp = tp;
} else {
wap = w - alen; wmp = tp - alen;
}
} else {
op = ow; ol = w - ow; lp = l;
map = ow;
if (mp->flags & CMF_LEFT) {
wap = w; wmp = w + alen;
} else {
wap = tp; wmp = ow;
}
}
/* If the matcher says that we are only interested
* in the line pattern, we just add that and the
* anchor and the string not added yet. Otherwise
* we add a new part. */
if (mp->flags & CMF_LINE) {
add_match_str(NULL, NULL, op, ol, sfx);
add_match_str(NULL, NULL, lp, llen + alen, sfx);
add_match_sub(NULL, NULL, ol, op, ol);
add_match_sub(NULL, NULL, llen + alen,
lp, llen + alen);
} else if (sfx) {
add_match_str(NULL, NULL,
map, ct + ol + alen, sfx);
add_match_part(mp, l + aoff, wap, alen,
l + loff, llen, op, ol, ol, sfx);
add_match_sub(NULL, NULL, 0, wmp, ct);
} else {
add_match_str(NULL, NULL,
map, ct + ol + alen, sfx);
if (both) {
add_match_sub(NULL, NULL, ol, op, ol);
ol = -1;
} else
ct += ol;
add_match_part(mp, l + aoff, wap, alen,
l + loff, llen, wmp, ct, ol, sfx);
}
}
/* Now skip over the matched portion and the anchor. */
llen += alen; alen += ict;
if (sfx) {
l -= llen; w -= alen;
} else {
l += llen; w += alen;
}
ll -= llen; il += llen;
lw -= alen; iw += alen;
bc += llen;
exact = 0;
if (!test)
while (bp &&
bc >= (bpc = (useqbr ? bp->qpos : bp->pos))) {
bp->curpos = matchbufadded + bpc - bc + obc;
bp = bp->next;
}
ow = w;
if (!llen && !alen) {
lm = mp;
if (he)
mp = NULL;
else
he = 1;
} else {
lm = NULL; he = 0;
}
break;
} else if (ll >= mp->llen && lw >= mp->wlen) {
/* Non-`*'-pattern. */
char *tl, *tw;
int tll, tlw, til, tiw;
/* We do this only if the line- and word-substrings
* are not equal. */
if (!(mp->flags & (CMF_LEFT | CMF_RIGHT)) &&
mp->llen == mp->wlen &&
!(sfx ? strncmp(l - mp->llen, w - mp->wlen, mp->llen) :
strncmp(l, w, mp->llen)))
continue;
/* Using local variables to make the following
* independent of whether we match a prefix or a
* suffix. */
if (sfx) {
tl = l - mp->llen; tw = w - mp->wlen;
til = ll - mp->llen; tiw = lw - mp->wlen;
tll = il + mp->llen; tlw = iw + mp->wlen;
} else {
tl = l; tw = w;
til = il; tiw = iw;
tll = ll; tlw = lw;
}
if (mp->flags & CMF_LEFT) {
/* Try to match the left anchor, if any. */
if (til < mp->lalen || tiw < mp->lalen + mp->ralen)
continue;
else if (mp->left)
t = pattern_match(mp->left, tl - mp->lalen,
NULL, NULL) &&
pattern_match(mp->left, tw - mp->lalen,
NULL, NULL) &&
(!mp->ralen ||
pattern_match(mp->right,
tw - mp->lalen - mp->ralen,
NULL, NULL));
else
t = (!sfx && !((mp->flags & CMF_INTER) ?
((mp->flags & CMF_LINE) ? iw : il) :
(il || iw)));
}
if (mp->flags & CMF_RIGHT) {
/* Try to match the right anchor, if any. */
if (tll < mp->llen + mp->ralen ||
tlw < mp->wlen + mp->ralen + mp->lalen)
continue;
else if (mp->right)
t = pattern_match(mp->right,
tl + mp->llen - mp->ralen,
NULL, NULL) &&
pattern_match(mp->right,
tw + mp->wlen - mp->ralen,
NULL, NULL) &&
(!mp->lalen ||
pattern_match(mp->left, tw + mp->wlen -
mp->ralen - mp->lalen,
NULL, NULL));
else
t = (sfx && !((mp->flags & CMF_INTER) ?
((mp->flags & CMF_LINE) ? iw : il) :
(il || iw)));
}
/* Now try to match the line and word patterns. */
if (!t ||
!pattern_match(mp->line, tl, NULL, ea) ||
!pattern_match(mp->word, tw, ea, NULL))
continue;
/* Probably add the matched strings. */
if (!test) {
if (sfx)
{
if (ow >= w)
add_match_str(NULL, NULL, w, ow - w, sfx);
}
else
{
if (w >= ow)
add_match_str(NULL, NULL, ow, w - ow, sfx);
}
add_match_str(mp, tl, tw, mp->wlen, sfx);
if (sfx)
{
if (ow >= w)
add_match_sub(NULL, NULL, 0, w, ow - w);
}
else
{
if (w >= ow)
add_match_sub(NULL, NULL, 0, ow, w - ow);
}
add_match_sub(mp, tl, mp->llen, tw, mp->wlen);
}
if (sfx) {
l = tl; w = tw;
} else {
l += mp->llen; w += mp->wlen;
}
il += mp->llen; iw += mp->wlen;
ll -= mp->llen; lw -= mp->wlen;
bc += mp->llen;
exact = 0;
if (!test)
while (bp &&
bc >= (bpc = (useqbr ? bp->qpos : bp->pos))) {
bp->curpos = matchbufadded + bpc - bc + obc;
bp = bp->next;
}
ow = w;
lm = NULL;
he = 0;
break;
}
}
}
if (mp)
continue;
/* Same code as at the beginning, used in top-level calls. */
bslash = 0;
if ((!test || sfx) && lw &&
(l[ind] == w[ind] ||
(bslash = (lw > 1 && w[ind] == '\\' &&
(ind ? (w[0] == l[0]) : (w[1] == l[0])))))) {
/* No matcher could be used, but the strings have the same
* character here, skip over it. */
l += add; w += (bslash ? (add + add ) : add);
il++; iw += 1 + bslash;
ll--; lw -= 1 + bslash;
bc++;
if (!test)
while (bp && bc >= (useqbr ? bp->qpos : bp->pos)) {
bp->curpos = matchbufadded + (sfx ? (ow - w) : (w - ow)) + obc;
bp = bp->next;
}
lm = NULL;
he = 0;
} else {
if (!lw)
break;
if (exact && !part) {
/* If we just accepted some characters directly (at the
* beginning of the loop) and now can't match any further,
* we go back to before those characters and try again,
* preferring match specs this time. */
il -= exact; iw -= wexact;
ll += exact; lw += wexact;
bc -= exact;
l -= add * exact; w -= add * wexact;
exact = wexact = 0;
goto retry;
}
/* No matcher and different characters: l does not match w. */
if (test)
return 0;
abort_match();
return -1;
}
}
/* If this is a recursive call, we just return if l matched w or not. */
if (test)
return (part || !ll);
/* In top-level calls, if ll is non-zero (unmatched portion in l),
* we have to free the collected clines. */
if (!part && ll) {
abort_match();
return -1;
}
if (rwlp)
*rwlp = iw - (sfx ? ow - w : w - ow);
/* If we matched a suffix, the anchors stored in the top-clines
* will be in the wrong clines: shifted by one. Adjust this. */
if (sfx && matchparts) {
Cline t, tn, s;
if (matchparts->prefix || matchparts->suffix) {
t = get_cline(NULL, 0, NULL, 0, NULL, 0, 0);
t->next = matchparts;
if (matchparts->prefix)
t->prefix = (Cline) 1;
else
t->suffix = (Cline) 1;
matchparts = t;
}
for (t = matchparts; (tn = t->next); t = tn) {
s = (tn->prefix ? tn->prefix : tn->suffix);
if (t->suffix)
t->suffix = s;
else
t->prefix = s;
}
t->prefix = t->suffix = NULL;
}
/* Finally, return the number of matched characters. */
*bpp = bp;
return (part ? il : iw);
}
/* Wrapper for match_str(), only for a certain length and only doing
* the test. */
/**/
static int
match_parts(char *l, char *w, int n, int part)
{
char lsav = l[n], wsav = w[n];
int ret;
if (lsav)
l[n] = '\0';
if (wsav)
w[n] = '\0';
ret = match_str(l, w, NULL, 0, NULL, 0, 1, part);
if (lsav)
l[n] = lsav;
if (wsav)
w[n] = wsav;
return ret;
}
/* Check if the word w is matched by the strings in pfx and sfx (the prefix
* and the suffix from the line) or the pattern cp. In clp a cline list for
* w is returned.
* qu is non-zero if the words has to be quoted before processed any further.
* bpl and bsl are used to report the positions where the brace-strings in
* the prefix and the suffix have to be re-inserted if this match is inserted
* in the line.
* The return value is the string to use as a completion or NULL if the prefix
* and the suffix don't match the word w. */
/**/
mod_export char *
comp_match(char *pfx, char *sfx, char *w, Patprog cp, Cline *clp, int qu,
Brinfo *bpl, int bcp, Brinfo *bsl, int bcs, int *exact)
{
char *r = NULL;
if (cp) {
/* We have a globcomplete-like pattern, just use that. */
int wl;
r = w;
if (!pattry(cp, r))
return NULL;
r = (qu == 2 ? tildequote(r, 0) : multiquote(r, !qu));
/* We still break it into parts here, trying to build a sensible
* cline list for these matches, too. */
w = dupstring(w);
wl = strlen(w);
*clp = bld_parts(w, wl, wl, NULL);
*exact = 0;
} else {
Cline pli, plil;
int mpl, rpl, wl;
w = (qu == 2 ? tildequote(w, 0) : multiquote(w, !qu));
wl = strlen(w);
/* Always try to match the prefix. */
useqbr = qu;
if ((mpl = match_str(pfx, w, bpl, bcp, &rpl, 0, 0, 0)) < 0)
return NULL;
if (sfx && *sfx) {
int wpl = matchbufadded, msl, rsl;
VARARR(char, wpfx, wpl);
Cline mli, mlil;
/* We also have a suffix to match, so first save the
* contents of the global matching variables. */
memcpy(wpfx, matchbuf, wpl);
if (matchsubs) {
Cline tmp = get_cline(NULL, 0, NULL, 0, NULL, 0, 0);
tmp->prefix = matchsubs;
if (matchlastpart)
matchlastpart->next = tmp;
else
matchparts = tmp;
}
pli = matchparts;
plil = matchlastpart;
/* The try to match the suffix. */
if ((msl = match_str(sfx, w + mpl, bsl, bcs, &rsl, 1, 0, 0)) < 0) {
free_cline(pli);
return NULL;
}
/* Matched, so add the string in the middle and the saved
* string for the prefix, and build a combined cline list
* for the prefix and the suffix. */
if (matchsubs) {
Cline tmp = get_cline(NULL, 0, NULL, 0, NULL, 0, CLF_SUF);
tmp->suffix = matchsubs;
if (matchlastpart)
matchlastpart->next = tmp;
else
matchparts = tmp;
}
add_match_str(NULL, NULL, w + rpl, wl - rpl - rsl, 1);
add_match_str(NULL, NULL, wpfx, wpl, 1);
mli = bld_parts(w + rpl, wl - rpl - rsl,
(mpl - rpl) + (msl - rsl), &mlil);
mlil->flags |= CLF_MID;
mlil->slen = msl - rsl;
mlil->next = revert_cline(matchparts);
if (plil)
plil->next = mli;
else
pli = mli;
} else {
/* Only a prefix, add the string and a part-cline for it. */
add_match_str(NULL, NULL, w + rpl, wl - rpl, 0);
add_match_part(NULL, NULL, NULL, 0, NULL, 0, w + rpl, wl - rpl,
mpl - rpl, 0);
pli = matchparts;
}
r = dupstring(matchbuf ? matchbuf : "");
*clp = pli;
/* Test if the string built is equal to the one from the line. */
if (sfx && *sfx) {
int pl = strlen(pfx);
*exact = (!strncmp(pfx, w, pl) && !strcmp(sfx, w + pl));
} else
*exact = !strcmp(pfx, w);
}
if (!qu)
hasunqu = 1;
return r;
}
/* Check if the given pattern matches the given string. *
* `in' and `out' are used for {...} classes. In `out' we store the *
* character number that was matched. In the word pattern this is *
* given in `in' so that we can easily test if we found the *
* corresponding character. */
/**/
mod_export int
pattern_match(Cpattern p, char *s, unsigned char *in, unsigned char *out)
{
unsigned char c;
while (p) {
c = *((unsigned char *) s);
if (out)
*out = 0;
if (p->equiv) {
if (in) {
c = p->tab[c];
if ((*in && *in != c) || (!*in && !c))
return 0;
} else if (out) {
if (!(*out = p->tab[c]))
return 0;
} else if (!p->tab[c])
return 0;
if (in && *in)
in++;
if (out)
out++;
} else if (!p->tab[c])
return 0;
s++;
p = p->next;
}
return 1;
}
/* This splits the given string into a list of cline structs, separated
* at those places where one of the anchors of an `*' pattern was found.
* plen gives the number of characters on the line that matched this
* string. In lp we return a pointer to the last cline struct we build. */
/**/
Cline
bld_parts(char *str, int len, int plen, Cline *lp)
{
Cline ret = NULL, *q = &ret, n = NULL;
Cmlist ms;
Cmatcher mp;
int t, op = plen;
char *p = str, *os = str;
while (len) {
for (t = 0, ms = bmatchers; ms && !t; ms = ms->next) {
mp = ms->matcher;
if (mp && mp->flags == CMF_RIGHT && mp->wlen < 0 && mp->ralen &&
!mp->llen && len >= mp->ralen && (str - os) >= mp->lalen &&
pattern_match(mp->right, str, NULL, NULL) &&
(!mp->lalen ||
((str - os) >= mp->lalen &&
pattern_match(mp->left, str - mp->lalen, NULL, NULL)))) {
int olen = str - p, llen;
/* We found an anchor, create a new cline. The NEW flag
* is set if the characters before the anchor were not
* on the line. */
*q = n = get_cline(NULL, mp->ralen, str, mp->ralen, NULL, 0,
((plen <= 0) ? CLF_NEW : 0));
/* If there were any characters before the anchor, add
* them as a cline struct. */
if (p != str) {
llen = (op < 0 ? 0 : op);
if (llen > olen)
llen = olen;
n->prefix = get_cline(NULL, llen, p, olen, NULL, 0, 0);
}
q = &(n->next);
str += mp->ralen; len -= mp->ralen;
plen -= mp->ralen;
op -= olen;
p = str;
t = 1;
}
}
if (!t) {
/* No anchor was found here, skip. */
str++; len--;
plen--;
}
}
/* This is the cline struct for the remaining string at the end. */
if (p != str) {
int olen = str - p, llen = (op < 0 ? 0 : op);
*q = n = get_cline(NULL, 0, NULL, 0, NULL, 0, (plen <= 0 ? CLF_NEW : 0));
if (llen > olen)
llen = olen;
n->prefix = get_cline(NULL, llen, p, olen, NULL, 0, 0);
}
else if (!ret)
*q = n = get_cline(NULL, 0, NULL, 0, NULL, 0, (plen <= 0 ? CLF_NEW : 0));
n->next = NULL;
if (lp)
*lp = n;
return ret;
}
/* This builds all the possible line patterns for the pattern pat in the
* buffer line. Initially line is the same as lp, but during recursive
* calls lp is incremented for storing successive characters. Whenever
* a full possible string is build, we test if this line matches the
* string given by wlen and word. The in argument contains the characters
* to use for the correspondence classes, it was filled by a call to
* pattern_match() in the calling function.
* The return value is the length of the string matched in the word, it
* is zero if we couldn't build a line that matches the word. */
/**/
static int
bld_line(Cpattern pat, char *line, char *lp,
char *word, int wlen, unsigned char *in, int sfx)
{
if (pat) {
/* Still working on the pattern. */
int i, l;
unsigned char c = 0;
/* Get the number of the character for a correspondence class
* if it has a correxponding class. */
if (pat->equiv)
if ((c = *in))
in++;
/* Walk through the table in the pattern and try the characters
* that may appear in the current position. */
for (i = 0; i < 256; i++)
if ((pat->equiv && c) ? (c == pat->tab[i]) : pat->tab[i]) {
*lp = i;
/* We stored the character, now call ourselves to build
* the rest. */
if ((l = bld_line(pat->next, line, lp + 1, word, wlen,
in, sfx)))
return l;
}
} else {
/* We reached the end, i.e. the line string is fully build, now
* see if it matches the given word. */
Cmlist ms;
Cmatcher mp;
int l = lp - line, t, rl = 0, ind, add;
VARARR(unsigned char, ea, l + 1);
/* Quick test if the strings are exactly the same. */
if (l == wlen && !strncmp(line, word, l))
return l;
if (sfx) {
line = lp; word += wlen;
ind = -1; add = -1;
} else {
ind = 0; add = 1;
}
/* We loop through the whole line string built. */
while (l && wlen) {
if (word[ind] == line[ind]) {
/* The same character in both strings, skip over. */
line += add; word += add;
l--; wlen--; rl++;
} else {
t = 0;
for (ms = bmatchers; ms && !t; ms = ms->next) {
mp = ms->matcher;
if (mp && !mp->flags && mp->wlen <= wlen && mp->llen <= l &&
pattern_match(mp->line, (sfx ? line - mp->llen : line),
NULL, ea) &&
pattern_match(mp->word, (sfx ? word - mp->wlen : word),
ea, NULL)) {
/* Both the line and the word pattern matched,
* now skip over the matched portions. */
if (sfx) {
line -= mp->llen; word -= mp->wlen;
} else {
line += mp->llen; word += mp->wlen;
}
l -= mp->llen; wlen -= mp->wlen; rl += mp->wlen;
t = 1;
}
}
if (!t)
/* Didn't match, give up. */
return 0;
}
}
if (!l)
/* Unmatched portion in the line built, return matched length. */
return rl;
}
return 0;
}
/* This builds a string that may be put on the line that fully matches the
* given strings. The return value is NULL if no such string could be built
* or that string in local static memory, dup it. */
/**/
static char *
join_strs(int la, char *sa, int lb, char *sb)
{
static char *rs = NULL;
static int rl = 0;
VARARR(unsigned char, ea, (la > lb ? la : lb) + 1);
Cmlist ms;
Cmatcher mp;
int t, bl, rr = rl;
char *rp = rs;
while (la && lb) {
if (*sa != *sb) {
/* Different characters, try the matchers. */
for (t = 0, ms = bmatchers; ms && !t; ms = ms->next) {
mp = ms->matcher;
if (mp && !mp->flags && mp->wlen > 0 && mp->llen > 0 &&
mp->wlen <= la && mp->wlen <= lb) {
/* The pattern has no anchors and the word
* pattern fits, try it. */
if ((t = pattern_match(mp->word, sa, NULL, ea)) ||
pattern_match(mp->word, sb, NULL, ea)) {
/* It matched one of the strings, t says which one. */
VARARR(char, line, mp->llen + 1);
char **ap, **bp;
int *alp, *blp;
if (t) {
ap = &sa; alp = &la;
bp = &sb; blp = &lb;
} else {
ap = &sb; alp = &lb;
bp = &sa; blp = &la;
}
/* Now try to build a string that matches the other
* string. */
if ((bl = bld_line(mp->line, line, line,
*bp, *blp, ea, 0))) {
/* Found one, put it into the return string. */
line[mp->llen] = '\0';
if (rr <= mp->llen) {
char *or = rs;
rs = realloc(rs, (rl += 20));
rr += 20;
rp += rs - or;
}
memcpy(rp, line, mp->llen);
rp += mp->llen; rr -= mp->llen;
*ap += mp->wlen; *alp -= mp->wlen;
*bp += bl; *blp -= bl;
t = 1;
} else
t = 0;
}
}
}
if (!t)
break;
} else {
/* Same character, just take it. */
if (rr <= 1) {
char *or = rs;
rs = realloc(rs, (rl += 20));
rr += 20;
rp += rs - or;
}
*rp++ = *sa; rr--;
sa++; sb++;
la--; lb--;
}
}
if (la || lb)
return NULL;
*rp = '\0';
return rs;
}
/* This compares the anchors stored in two top-level clines. */
/**/
static int
cmp_anchors(Cline o, Cline n, int join)
{
int line = 0;
char *j;
/* First try the exact strings. */
if ((!(o->flags & CLF_LINE) && o->wlen == n->wlen &&
(!o->word || !strncmp(o->word, n->word, o->wlen))) ||
(line = ((!o->line && !n->line && !o->wlen && !n->wlen) ||
(o->llen == n->llen && o->line && n->line &&
!strncmp(o->line, n->line, o->llen))))) {
if (line) {
o->flags |= CLF_LINE;
o->word = NULL;
o->wlen = 0;
}
return 1;
}
/* Didn't work, try to build a string matching both anchors. */
if (join && !(o->flags & CLF_JOIN) && o->word && n->word &&
(j = join_strs(o->wlen, o->word, n->wlen, n->word))) {
o->flags |= CLF_JOIN;
o->wlen = strlen(j);
o->word = dupstring(j);
return 2;
}
return 0;
}
/* Below is the code to join two cline lists. This struct is used to walk
* through a sub-list. */
typedef struct cmdata *Cmdata;
struct cmdata {
Cline cl, pcl;
char *str, *astr;
int len, alen, olen, line;
};
/* This is used to ensure that a cmdata struct contains usable data.
* The return value is non-zero if we reached the end. */
static int
check_cmdata(Cmdata md, int sfx)
{
/* We will use the str and len fields to contain the next sub-string
* in the list. If len is zero, we have to use the next cline. */
if (!md->len) {
/* If there is none, we reached the end. */
if (!md->cl)
return 1;
/* Otherwise, get the string. Only the line-string or both.
* We also have to adjust the pointer if this is for a suffix. */
if (md->cl->flags & CLF_LINE) {
md->line = 1;
md->len = md->cl->llen;
md->str = md->cl->line;
} else {
md->line = 0;
md->len = md->olen = md->cl->wlen;
if ((md->str = md->cl->word) && sfx)
md->str += md->len;
md->alen = md->cl->llen;
if ((md->astr = md->cl->line) && sfx)
md->astr += md->alen;
}
md->pcl = md->cl;
md->cl = md->cl->next;
}
return 0;
}
/* This puts the not-yet-matched portion back into the last cline and
* returns that. */
static Cline
undo_cmdata(Cmdata md, int sfx)
{
Cline r = md->pcl;
if (md->line) {
r->word = NULL;
r->wlen = 0;
r->flags |= CLF_LINE;
r->llen = md->len;
r->line = md->str - (sfx ? md->len : 0);
} else if (md->len != md->olen) {
r->wlen = md->len;
r->word = md->str - (sfx ? md->len : 0);
}
return r;
}
/* This tries to build a string matching a sub-string in a sub-cline
* that could not be matched otherwise. */
static Cline
join_sub(Cmdata md, char *str, int len, int *mlen, int sfx, int join)
{
if (!check_cmdata(md, sfx)) {
char *ow = str, *nw = md->str;
int ol = len, nl = md->len;
Cmlist ms;
Cmatcher mp;
VARARR(unsigned char, ea, (ol > nl ? ol : nl) + 1);
int t;
if (sfx) {
ow += ol; nw += nl;
}
for (t = 0, ms = bmatchers; ms && !t; ms = ms->next) {
mp = ms->matcher;
/* We use only those patterns that match a non-empty
* string in both the line and the word and that have
* no anchors. */
if (mp && !mp->flags && mp->wlen > 0 && mp->llen > 0) {
/* We first test, if the old string matches already the
* new one. */
if (mp->llen <= ol && mp->wlen <= nl &&
pattern_match(mp->line, ow - (sfx ? mp->llen : 0),
NULL, ea) &&
pattern_match(mp->word, nw - (sfx ? mp->wlen : 0),
ea, NULL)) {
/* It did, update the contents of the cmdata struct
* and return a cline for the matched part. */
if (sfx)
md->str -= mp->wlen;
else
md->str += mp->wlen;
md->len -= mp->wlen;
*mlen = mp->llen;
return get_cline(NULL, 0, ow - (sfx ? mp->llen : 0),
mp->llen, NULL, 0, 0);
}
/* Otherwise we will try to build a string that matches
* both strings. But try the pattern only if the word-
* pattern matches one of the strings. */
if (join && mp->wlen <= ol && mp->wlen <= nl &&
((t = pattern_match(mp->word, ow - (sfx ? mp->wlen : 0),
NULL, ea)) ||
pattern_match(mp->word, nw - (sfx ? mp->wlen : 0),
NULL, ea))) {
VARARR(char, line, mp->llen + 1);
int bl;
/* Then build all the possible lines and see
* if one of them matches the other string. */
if ((bl = bld_line(mp->line, line, line,
(t ? nw : ow), (t ? nl : ol),
ea, sfx))) {
/* Yep, one of the lines matched the other
* string. */
line[mp->llen] = '\0';
if (t) {
ol = mp->wlen; nl = bl;
} else {
ol = bl; nl = mp->wlen;
}
if (sfx)
md->str -= nl;
else
md->str += nl;
md->len -= nl;
*mlen = ol;
return get_cline(NULL, 0, dupstring(line), mp->llen,
NULL, 0, CLF_JOIN);
}
}
}
}
}
return NULL;
}
/* This is used to match a sub-string in a sub-cline. The length of the
* matched portion is returned. This tests only for exact equality. */
static int
sub_match(Cmdata md, char *str, int len, int sfx)
{
int ret = 0, l, ind, add;
char *p, *q;
if (sfx) {
str += len;
ind = -1; add = -1;
} else {
ind = 0; add = 1;
}
/* str and len describe the old string, in md we have the new one. */
while (len) {
if (check_cmdata(md, sfx))
return ret;
/*
* Look for a common prefix. If we do include metafied
* characters, at this stage we still need the overall length
* including Meta's as separate characters.
*/
for (l = 0, p = str, q = md->str;
l < len && l < md->len && p[ind] == q[ind];
l++, p += add, q += add) {}
/* Make sure we don't end in the middle of a Meta sequence. */
if (add == 1) {
if (l && p[-1] == Meta)
l--;
} else {
if (l && ((l < len && p[-1] == Meta)
|| (l < md->len && q[-1] == Meta)))
l--;
}
if (l) {
/* There was a common prefix, use it. */
md->len -= l; len -= l;
if (sfx) {
md->str -= l; str -= l;
} else {
md->str += l; str += l;
}
ret += l;
} else if (md->line || md->len != md->olen || !md->astr)
return ret;
else {
/* We still have the line string to try. */
md->line = 1;
md->len = md->alen;
md->str = md->astr;
}
}
return ret;
}
/* This is used to build a common prefix or suffix sub-list. If requested
* it returns the unmatched cline lists in orest and nrest. */
/**/
static void
join_psfx(Cline ot, Cline nt, Cline *orest, Cline *nrest, int sfx)
{
Cline p = NULL, o, n;
struct cmdata md, omd;
char **sstr = NULL;
int len, join = 0, line = 0, *slen = NULL;
if (sfx) {
o = ot->suffix; n = nt->suffix;
} else {
o = ot->prefix; n = nt->prefix;
}
if (!o) {
if (orest)
*orest = NULL;
if (nrest)
*nrest = n;
if (n && n->wlen)
ot->flags |= CLF_MISS;
return;
}
if (!n) {
if (sfx)
ot->suffix = NULL;
else
ot->prefix = NULL;
if (orest)
*orest = o;
else
free_cline(o);
if (nrest)
*nrest = NULL;
return;
}
md.cl = n;
md.len = 0;
/* Walk through the old list. */
while (o) {
join = 0;
memcpy(&omd, &md, sizeof(struct cmdata));
/* We first get the length of the prefix equal in both strings. */
if (o->flags & CLF_LINE) {
if ((len = sub_match(&md, o->line, o->llen, sfx)) != o->llen) {
join = 1; line = 1; slen = &(o->llen); sstr = &(o->line);
}
} else if ((len = sub_match(&md, o->word, o->wlen, sfx)) != o->wlen) {
if (o->line) {
memcpy(&md, &omd, sizeof(struct cmdata));
o->flags |= CLF_LINE | CLF_DIFF;
continue;
}
o->llen = o->llen - ot->slen;
join = 1; line = 0; slen = &(o->wlen); sstr = &(o->word);
}
if (join) {
/* There is a rest that is different in the two lists,
* we try to build a new cline matching both strings. */
Cline joinl;
int jlen;
if ((joinl = join_sub(&md, *sstr + len, *slen - len,
&jlen, sfx, !(o->flags & CLF_JOIN)))) {
/* We have one, insert it into the list. */
joinl->flags |= CLF_DIFF;
if (len + jlen != *slen) {
Cline rest;
rest = get_cline(NULL, 0, *sstr + (sfx ? 0 : len + jlen),
*slen - len - jlen, NULL, 0, 0);
rest->next = o->next;
joinl->next = rest;
} else
joinl->next = o->next;
if (len) {
if (sfx)
*sstr += *slen - len;
*slen = len;
o->next = joinl;
} else {
o->next = NULL;
free_cline(o);
if (p)
p->next = joinl;
else if (sfx)
ot->suffix = joinl;
else
ot->prefix = joinl;
}
o = joinl;
join = 0;
}
}
if (join) {
/* We couldn't build a cline for a common string, so we
* cut the list here. */
if (len) {
Cline r;
if (orest) {
if (line)
r = get_cline(o->line + len, *slen - len,
NULL, 0, NULL, 0, o->flags);
else
r = get_cline(NULL, 0, o->word + len, *slen - len,
NULL, 0, o->flags);
r->next = o->next;
*orest = r;
*slen = len;
o->next = NULL;
} else {
if (sfx)
*sstr += *slen - len;
*slen = len;
free_cline(o->next);
o->next = NULL;
}
} else {
if (p)
p->next = NULL;
else if (sfx)
ot->suffix = NULL;
else
ot->prefix = NULL;
if (orest)
*orest = o;
else
free_cline(o);
}
if (!orest || !nrest)
ot->flags |= CLF_MISS;
if (nrest)
*nrest = undo_cmdata(&md, sfx);
return;
}
p = o;
o = o->next;
}
if (md.len || md.cl)
ot->flags |= CLF_MISS;
if (orest)
*orest = NULL;
if (nrest)
*nrest = undo_cmdata(&md, sfx);
}
/* This builds the common prefix and suffix for a mid-cline -- the one
* describing the place where the prefix and the suffix meet. */
/**/
static void
join_mid(Cline o, Cline n)
{
if (o->flags & CLF_JOIN) {
/* The JOIN flag is set in the old cline struct if it was
* already joined with another one. In this case the suffix
* field contains the suffix from previous calls. */
Cline nr;
join_psfx(o, n, NULL, &nr, 0);
n->suffix = revert_cline(nr);
join_psfx(o, n, NULL, NULL, 1);
} else {
/* This is the first time for both structs, so the prefix field
* contains the whole sub-list. */
Cline or, nr;
o->flags |= CLF_JOIN;
/* We let us give both rests and use them as the suffixes. */
join_psfx(o, n, &or, &nr, 0);
if (or)
or->llen = (o->slen > or->wlen ? or->wlen : o->slen);
o->suffix = revert_cline(or);
n->suffix = revert_cline(nr);
join_psfx(o, n, NULL, NULL, 1);
}
n->suffix = NULL;
}
/* This turns the sequence of anchor cline structs from b to e into a
* prefix sequence, puts it before the prefix of e and then tries to
* join that with the prefix of a.
* This is needed if some matches had a anchor match spec and others
* didn't. */
/**/
static int
sub_join(Cline a, Cline b, Cline e, int anew)
{
if (!e->suffix && a->prefix) {
Cline op = e->prefix, n = NULL, *p = &n, t, ca;
int min = 0, max = 0;
for (; b != e; b = b->next) {
if ((*p = t = b->prefix)) {
while (t->next)
t = t->next;
p = &(t->next);
}
b->suffix = b->prefix = NULL;
b->flags &= ~CLF_SUF;
min += b->min;
max += b->max;
*p = b;
p = &(b->next);
}
*p = e->prefix;
ca = a->prefix;
while (n) {
e->prefix = cp_cline(n, 0);
a->prefix = cp_cline(ca, 0);
if (anew) {
int f = e->flags;
join_psfx(e, a, NULL, NULL, 0);
e->flags = f;
if (e->prefix)
return max - min;
} else {
int f = e->flags;
join_psfx(a, e, NULL, NULL, 0);
e->flags = f;
if (a->prefix)
return max - min;
}
min -= n->min;
if (n == op)
break;
n = n->next;
}
return max - min;
}
return 0;
}
/* This simplifies the cline list given as the first argument so that
* it also matches the second list. */
/**/
Cline
join_clines(Cline o, Cline n)
{
cline_setlens(n, 1);
/* First time called, just return the new list. On further invocations
* we will get it as the first argument. */
if (!o)
return n;
else {
Cline oo = o, nn = n, po = NULL, pn = NULL, x;
int diff;
/* Walk through the lists. */
while (o && n) {
/* If one of them describes a new part and the other one does
* not, synchronise them by searching an old part in the
* other list. */
if ((o->flags & CLF_NEW) && !(n->flags & CLF_NEW)) {
Cline t, tn;
for (t = o; (tn = t->next) &&
((tn->flags & CLF_NEW) || !cmp_anchors(tn, n, 0));
t = tn);
if (tn) {
diff = sub_join(n, o, tn, 1);
if (po)
po->next = tn;
else
oo = tn;
t->next = NULL;
free_cline(o);
x = o;
o = tn;
if (po && po->prefix && cmp_anchors(x, po, 0)) {
po->flags |= CLF_MISS;
po->max += diff;
} else {
o->flags |= CLF_MISS;
o->max += diff;
}
continue;
}
}
if (!(o->flags & CLF_NEW) && (n->flags & CLF_NEW)) {
Cline t, tn;
for (t = n; (tn = t->next) &&
((tn->flags & CLF_NEW) || !cmp_anchors(o, tn, 0));
t = tn);
if (tn) {
int of = o->flags & CLF_MISS;
diff = sub_join(o, n, tn, 0);
o->flags = (o->flags & ~CLF_MISS) | of;
if (po && po->prefix && cmp_anchors(n, pn, 0)) {
po->flags |= CLF_MISS;
po->max += diff;
} else {
o->flags |= CLF_MISS;
o->max += diff;
}
n = tn;
continue;
}
}
/* Almost the same as above, but for the case that they
* describe different types of parts (prefix, suffix, or mid). */
if ((o->flags & (CLF_SUF | CLF_MID)) !=
(n->flags & (CLF_SUF | CLF_MID))) {
Cline t, tn;
for (t = n;
(tn = t->next) &&
(tn->flags & (CLF_SUF | CLF_MID)) !=
(o->flags & (CLF_SUF | CLF_MID));
t = tn);
if (tn && cmp_anchors(o, tn, 1)) {
sub_join(o, n, tn, 0);
n = tn;
continue;
}
for (t = o;
(tn = t->next) &&
(tn->flags & (CLF_SUF | CLF_MID)) !=
(n->flags & (CLF_SUF | CLF_MID));
t = tn);
if (tn && cmp_anchors(tn, n, 1)) {
sub_join(n, o, tn, 1);
if (po)
po->next = tn;
else
oo = tn;
t->next = NULL;
free_cline(o);
o = tn;
continue;
}
if (o->flags & CLF_MID) {
o->flags = (o->flags & ~CLF_MID) | (n->flags & CLF_SUF);
if (n->flags & CLF_SUF) {
free_cline(o->prefix);
o->prefix = NULL;
} else {
free_cline(o->suffix);
o->suffix = NULL;
}
}
break;
}
/* Now see if they have matching anchors. If not, cut the list. */
if (!(o->flags & CLF_MID) && !cmp_anchors(o, n, 1)) {
Cline t, tn, tt, to = NULL;
for (t = n; (tn = t->next); t = tn)
if (!(tn->flags & CLF_NEW) && (tn->flags & CLF_SKIP)) {
for (tt = o; (to = tt->next); tt = to)
if (!(to->flags & CLF_NEW) && (to->flags & CLF_SKIP) &&
cmp_anchors(tn, to, 1))
break;
if (to)
break;
}
if (tn) {
if (po)
po->next = to;
else
oo = to;
o = to;
diff = sub_join(o, n, tn, 0);
o->flags |= CLF_MISS;
o->max += diff;
n = tn;
po = o;
o = o->next;
pn = n;
n = n->next;
continue;
} else {
for (t = o; (to = t->next); t = to)
if ((to->flags & CLF_SKIP) && cmp_anchors(n, to, 1))
break;
if (to) {
diff = sub_join(n, o, to, 1);
if (po)
po->next = to;
else
oo = to;
x = o;
o = to;
if (po && po->prefix && cmp_anchors(x, po, 0)) {
po->flags |= CLF_MISS;
po->max += diff;
} else {
o->flags |= CLF_MISS;
o->max += diff;
}
continue;
} else {
for (tt = NULL, t = n; (tn = t->next); t = tn) {
if (tn->flags & CLF_SKIP)
for (tt = o; (to = tt->next); tt = to)
if ((to->flags & CLF_SKIP) &&
cmp_anchors(tn, to, 1))
break;
if (to)
break;
}
if (to) {
diff = sub_join(n, o, to, 1);
if (po)
po->next = to;
else
oo = to;
x = o;
o = to;
if (po && po->prefix && cmp_anchors(x, po, 0)) {
po->flags |= CLF_MISS;
po->max += diff;
} else {
o->flags |= CLF_MISS;
o->max += diff;
}
continue;
} else {
for (tn = n; tn; tn = tn->next)
if ((tn->flags & CLF_NEW) ==
(o->flags & CLF_NEW) &&
cmp_anchors(tn, o, 1)) break;
if (tn) {
int of = o->flags & CLF_MISS;
if ((diff = sub_join(o, n, tn, 0))) {
o->flags = (o->flags & ~CLF_MISS) | of;
if (po && po->prefix) {
po->flags |= CLF_MISS;
po->max += diff;
}
else {
o->flags |= CLF_MISS;
o->max += diff;
}
}
n = tn;
po = o;
o = o->next;
pn = n;
n = n->next;
continue;
}
if (o->flags & CLF_SUF)
break;
o->word = o->line = o->orig = NULL;
o->wlen = 0;
free_cline(o->next);
o->next = NULL;
o->flags |= CLF_MISS;
}
}
}
}
/* Ok, they are equal, now copy the information about the
* original string if needed, calculate minimum and maximum
* lengths, and join the sub-lists. */
if (!o->orig && !o->olen) {
o->orig = n->orig;
o->olen = n->olen;
}
if (n->min < o->min)
o->min = n->min;
if (n->max > o->max)
o->max = n->max;
if (o->flags & CLF_MID)
join_mid(o, n);
else
join_psfx(o, n, NULL, NULL, (o->flags & CLF_SUF));
po = o;
o = o->next;
pn = n;
n = n->next;
}
/* Free the rest of the old list. */
if (o) {
if (po)
po->next = NULL;
else
oo = NULL;
free_cline(o);
}
free_cline(nn);
return oo;
}
}
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