regc_color.c
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上传日期:2015-12-11
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- /*
- * colorings of characters
- * This file is #included by regcomp.c.
- *
- * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
- *
- * Development of this software was funded, in part, by Cray Research Inc.,
- * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
- * Corporation, none of whom are responsible for the results. The author
- * thanks all of them.
- *
- * Redistribution and use in source and binary forms -- with or without
- * modification -- are permitted for any purpose, provided that
- * redistributions in source form retain this entire copyright notice and
- * indicate the origin and nature of any modifications.
- *
- * I'd appreciate being given credit for this package in the documentation
- * of software which uses it, but that is not a requirement.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- *
- *
- * Note that there are some incestuous relationships between this code and
- * NFA arc maintenance, which perhaps ought to be cleaned up sometime.
- */
- #define CISERR() VISERR(cm->v)
- #define CERR(e) VERR(cm->v, (e))
- /*
- - initcm - set up new colormap
- ^ static VOID initcm(struct vars *, struct colormap *);
- */
- static VOID
- initcm(v, cm)
- struct vars *v;
- struct colormap *cm;
- {
- int i;
- int j;
- union tree *t;
- union tree *nextt;
- struct colordesc *cd;
- cm->magic = CMMAGIC;
- cm->v = v;
- cm->ncds = NINLINECDS;
- cm->cd = cm->cdspace;
- cm->max = 0;
- cm->free = 0;
- cd = cm->cd; /* cm->cd[WHITE] */
- cd->sub = NOSUB;
- cd->arcs = NULL;
- cd->flags = 0;
- cd->nchrs = CHR_MAX - CHR_MIN + 1;
- /* upper levels of tree */
- for (t = &cm->tree[0], j = NBYTS-1; j > 0; t = nextt, j--) {
- nextt = t + 1;
- for (i = BYTTAB-1; i >= 0; i--)
- t->tptr[i] = nextt;
- }
- /* bottom level is solid white */
- t = &cm->tree[NBYTS-1];
- for (i = BYTTAB-1; i >= 0; i--)
- t->tcolor[i] = WHITE;
- cd->block = t;
- }
- /*
- - freecm - free dynamically-allocated things in a colormap
- ^ static VOID freecm(struct colormap *);
- */
- static VOID
- freecm(cm)
- struct colormap *cm;
- {
- size_t i;
- union tree *cb;
- cm->magic = 0;
- if (NBYTS > 1)
- cmtreefree(cm, cm->tree, 0);
- for (i = 1; i <= cm->max; i++) /* skip WHITE */
- if (!UNUSEDCOLOR(&cm->cd[i])) {
- cb = cm->cd[i].block;
- if (cb != NULL)
- FREE(cb);
- }
- if (cm->cd != cm->cdspace)
- FREE(cm->cd);
- }
- /*
- - cmtreefree - free a non-terminal part of a colormap tree
- ^ static VOID cmtreefree(struct colormap *, union tree *, int);
- */
- static VOID
- cmtreefree(cm, tree, level)
- struct colormap *cm;
- union tree *tree;
- int level; /* level number (top == 0) of this block */
- {
- int i;
- union tree *t;
- union tree *fillt = &cm->tree[level+1];
- union tree *cb;
- assert(level < NBYTS-1); /* this level has pointers */
- for (i = BYTTAB-1; i >= 0; i--) {
- t = tree->tptr[i];
- assert(t != NULL);
- if (t != fillt) {
- if (level < NBYTS-2) { /* more pointer blocks below */
- cmtreefree(cm, t, level+1);
- FREE(t);
- } else { /* color block below */
- cb = cm->cd[t->tcolor[0]].block;
- if (t != cb) /* not a solid block */
- FREE(t);
- }
- }
- }
- }
- /*
- - setcolor - set the color of a character in a colormap
- ^ static color setcolor(struct colormap *, pchr, pcolor);
- */
- static color /* previous color */
- setcolor(cm, c, co)
- struct colormap *cm;
- pchr c;
- pcolor co;
- {
- uchr uc = c;
- int shift;
- int level;
- int b;
- int bottom;
- union tree *t;
- union tree *newt;
- union tree *fillt;
- union tree *lastt;
- union tree *cb;
- color prev;
- assert(cm->magic == CMMAGIC);
- if (CISERR() || co == COLORLESS)
- return COLORLESS;
- t = cm->tree;
- for (level = 0, shift = BYTBITS * (NBYTS - 1); shift > 0;
- level++, shift -= BYTBITS) {
- b = (uc >> shift) & BYTMASK;
- lastt = t;
- t = lastt->tptr[b];
- assert(t != NULL);
- fillt = &cm->tree[level+1];
- bottom = (shift <= BYTBITS) ? 1 : 0;
- cb = (bottom) ? cm->cd[t->tcolor[0]].block : fillt;
- if (t == fillt || t == cb) { /* must allocate a new block */
- newt = (union tree *)MALLOC((bottom) ?
- sizeof(struct colors) : sizeof(struct ptrs));
- if (newt == NULL) {
- CERR(REG_ESPACE);
- return COLORLESS;
- }
- if (bottom)
- memcpy(VS(newt->tcolor), VS(t->tcolor),
- BYTTAB*sizeof(color));
- else
- memcpy(VS(newt->tptr), VS(t->tptr),
- BYTTAB*sizeof(union tree *));
- t = newt;
- lastt->tptr[b] = t;
- }
- }
- b = uc & BYTMASK;
- prev = t->tcolor[b];
- t->tcolor[b] = (color)co;
- return prev;
- }
- /*
- - maxcolor - report largest color number in use
- ^ static color maxcolor(struct colormap *);
- */
- static color
- maxcolor(cm)
- struct colormap *cm;
- {
- if (CISERR())
- return COLORLESS;
- return (color)cm->max;
- }
- /*
- - newcolor - find a new color (must be subject of setcolor at once)
- * Beware: may relocate the colordescs.
- ^ static color newcolor(struct colormap *);
- */
- static color /* COLORLESS for error */
- newcolor(cm)
- struct colormap *cm;
- {
- struct colordesc *cd;
- struct colordesc *new;
- size_t n;
- if (CISERR())
- return COLORLESS;
- if (cm->free != 0) {
- assert(cm->free > 0);
- assert((size_t)cm->free < cm->ncds);
- cd = &cm->cd[cm->free];
- assert(UNUSEDCOLOR(cd));
- assert(cd->arcs == NULL);
- cm->free = cd->sub;
- } else if (cm->max < cm->ncds - 1) {
- cm->max++;
- cd = &cm->cd[cm->max];
- } else {
- /* oops, must allocate more */
- n = cm->ncds * 2;
- if (cm->cd == cm->cdspace) {
- new = (struct colordesc *)MALLOC(n *
- sizeof(struct colordesc));
- if (new != NULL)
- memcpy(VS(new), VS(cm->cdspace), cm->ncds *
- sizeof(struct colordesc));
- } else
- new = (struct colordesc *)REALLOC(cm->cd,
- n * sizeof(struct colordesc));
- if (new == NULL) {
- CERR(REG_ESPACE);
- return COLORLESS;
- }
- cm->cd = new;
- cm->ncds = n;
- assert(cm->max < cm->ncds - 1);
- cm->max++;
- cd = &cm->cd[cm->max];
- }
- cd->nchrs = 0;
- cd->sub = NOSUB;
- cd->arcs = NULL;
- cd->flags = 0;
- cd->block = NULL;
- return (color)(cd - cm->cd);
- }
- /*
- - freecolor - free a color (must have no arcs or subcolor)
- ^ static VOID freecolor(struct colormap *, pcolor);
- */
- static VOID
- freecolor(cm, co)
- struct colormap *cm;
- pcolor co;
- {
- struct colordesc *cd = &cm->cd[co];
- color pco, nco; /* for freelist scan */
- assert(co >= 0);
- if (co == WHITE)
- return;
- assert(cd->arcs == NULL);
- assert(cd->sub == NOSUB);
- assert(cd->nchrs == 0);
- cd->flags = FREECOL;
- if (cd->block != NULL) {
- FREE(cd->block);
- cd->block = NULL; /* just paranoia */
- }
- if ((size_t)co == cm->max) {
- while (cm->max > WHITE && UNUSEDCOLOR(&cm->cd[cm->max]))
- cm->max--;
- assert(cm->free >= 0);
- while ((size_t)cm->free > cm->max)
- cm->free = cm->cd[cm->free].sub;
- if (cm->free > 0) {
- assert(cm->free < cm->max);
- pco = cm->free;
- nco = cm->cd[pco].sub;
- while (nco > 0)
- if ((size_t)nco > cm->max) {
- /* take this one out of freelist */
- nco = cm->cd[nco].sub;
- cm->cd[pco].sub = nco;
- } else {
- assert(nco < cm->max);
- pco = nco;
- nco = cm->cd[pco].sub;
- }
- }
- } else {
- cd->sub = cm->free;
- cm->free = (color)(cd - cm->cd);
- }
- }
- /*
- - pseudocolor - allocate a false color, to be managed by other means
- ^ static color pseudocolor(struct colormap *);
- */
- static color
- pseudocolor(cm)
- struct colormap *cm;
- {
- color co;
- co = newcolor(cm);
- if (CISERR())
- return COLORLESS;
- cm->cd[co].nchrs = 1;
- cm->cd[co].flags = PSEUDO;
- return co;
- }
- /*
- - subcolor - allocate a new subcolor (if necessary) to this chr
- ^ static color subcolor(struct colormap *, pchr c);
- */
- static color
- subcolor(cm, c)
- struct colormap *cm;
- pchr c;
- {
- color co; /* current color of c */
- color sco; /* new subcolor */
- co = GETCOLOR(cm, c);
- sco = newsub(cm, co);
- if (CISERR())
- return COLORLESS;
- assert(sco != COLORLESS);
- if (co == sco) /* already in an open subcolor */
- return co; /* rest is redundant */
- cm->cd[co].nchrs--;
- cm->cd[sco].nchrs++;
- setcolor(cm, c, sco);
- return sco;
- }
- /*
- - newsub - allocate a new subcolor (if necessary) for a color
- ^ static color newsub(struct colormap *, pcolor);
- */
- static color
- newsub(cm, co)
- struct colormap *cm;
- pcolor co;
- {
- color sco; /* new subcolor */
- sco = cm->cd[co].sub;
- if (sco == NOSUB) { /* color has no open subcolor */
- if (cm->cd[co].nchrs == 1) /* optimization */
- return co;
- sco = newcolor(cm); /* must create subcolor */
- if (sco == COLORLESS) {
- assert(CISERR());
- return COLORLESS;
- }
- cm->cd[co].sub = sco;
- cm->cd[sco].sub = sco; /* open subcolor points to self */
- }
- assert(sco != NOSUB);
- return sco;
- }
- /*
- - subrange - allocate new subcolors to this range of chrs, fill in arcs
- ^ static VOID subrange(struct vars *, pchr, pchr, struct state *,
- ^ struct state *);
- */
- static VOID
- subrange(v, from, to, lp, rp)
- struct vars *v;
- pchr from;
- pchr to;
- struct state *lp;
- struct state *rp;
- {
- uchr uf;
- int i;
- assert(from <= to);
- /* first, align "from" on a tree-block boundary */
- uf = (uchr)from;
- i = (int)( ((uf + BYTTAB-1) & (uchr)~BYTMASK) - uf );
- for (; from <= to && i > 0; i--, from++)
- newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp);
- if (from > to) /* didn't reach a boundary */
- return;
- /* deal with whole blocks */
- for (; to - from >= BYTTAB; from += BYTTAB)
- subblock(v, from, lp, rp);
- /* clean up any remaining partial table */
- for (; from <= to; from++)
- newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp);
- }
- /*
- - subblock - allocate new subcolors for one tree block of chrs, fill in arcs
- ^ static VOID subblock(struct vars *, pchr, struct state *, struct state *);
- */
- static VOID
- subblock(v, start, lp, rp)
- struct vars *v;
- pchr start; /* first of BYTTAB chrs */
- struct state *lp;
- struct state *rp;
- {
- uchr uc = start;
- struct colormap *cm = v->cm;
- int shift;
- int level;
- int i;
- int b;
- union tree *t;
- union tree *cb;
- union tree *fillt;
- union tree *lastt;
- int previ;
- int ndone;
- color co;
- color sco;
- assert((uc % BYTTAB) == 0);
- /* find its color block, making new pointer blocks as needed */
- t = cm->tree;
- fillt = NULL;
- for (level = 0, shift = BYTBITS * (NBYTS - 1); shift > 0;
- level++, shift -= BYTBITS) {
- b = (uc >> shift) & BYTMASK;
- lastt = t;
- t = lastt->tptr[b];
- assert(t != NULL);
- fillt = &cm->tree[level+1];
- if (t == fillt && shift > BYTBITS) { /* need new ptr block */
- t = (union tree *)MALLOC(sizeof(struct ptrs));
- if (t == NULL) {
- CERR(REG_ESPACE);
- return;
- }
- memcpy(VS(t->tptr), VS(fillt->tptr),
- BYTTAB*sizeof(union tree *));
- lastt->tptr[b] = t;
- }
- }
- /* special cases: fill block or solid block */
- co = t->tcolor[0];
- cb = cm->cd[co].block;
- if (t == fillt || t == cb) {
- /* either way, we want a subcolor solid block */
- sco = newsub(cm, co);
- t = cm->cd[sco].block;
- if (t == NULL) { /* must set it up */
- t = (union tree *)MALLOC(sizeof(struct colors));
- if (t == NULL) {
- CERR(REG_ESPACE);
- return;
- }
- for (i = 0; i < BYTTAB; i++)
- t->tcolor[i] = sco;
- cm->cd[sco].block = t;
- }
- /* find loop must have run at least once */
- lastt->tptr[b] = t;
- newarc(v->nfa, PLAIN, sco, lp, rp);
- cm->cd[co].nchrs -= BYTTAB;
- cm->cd[sco].nchrs += BYTTAB;
- return;
- }
- /* general case, a mixed block to be altered */
- i = 0;
- while (i < BYTTAB) {
- co = t->tcolor[i];
- sco = newsub(cm, co);
- newarc(v->nfa, PLAIN, sco, lp, rp);
- previ = i;
- do {
- t->tcolor[i++] = sco;
- } while (i < BYTTAB && t->tcolor[i] == co);
- ndone = i - previ;
- cm->cd[co].nchrs -= ndone;
- cm->cd[sco].nchrs += ndone;
- }
- }
- /*
- - okcolors - promote subcolors to full colors
- ^ static VOID okcolors(struct nfa *, struct colormap *);
- */
- static VOID
- okcolors(nfa, cm)
- struct nfa *nfa;
- struct colormap *cm;
- {
- struct colordesc *cd;
- struct colordesc *end = CDEND(cm);
- struct colordesc *scd;
- struct arc *a;
- color co;
- color sco;
- for (cd = cm->cd, co = 0; cd < end; cd++, co++) {
- sco = cd->sub;
- if (UNUSEDCOLOR(cd) || sco == NOSUB) {
- /* has no subcolor, no further action */
- } else if (sco == co) {
- /* is subcolor, let parent deal with it */
- } else if (cd->nchrs == 0) {
- /* parent empty, its arcs change color to subcolor */
- cd->sub = NOSUB;
- scd = &cm->cd[sco];
- assert(scd->nchrs > 0);
- assert(scd->sub == sco);
- scd->sub = NOSUB;
- while ((a = cd->arcs) != NULL) {
- assert(a->co == co);
- uncolorchain(cm, a);
- a->co = sco;
- colorchain(cm, a);
- }
- freecolor(cm, co);
- } else {
- /* parent's arcs must gain parallel subcolor arcs */
- cd->sub = NOSUB;
- scd = &cm->cd[sco];
- assert(scd->nchrs > 0);
- assert(scd->sub == sco);
- scd->sub = NOSUB;
- for (a = cd->arcs; a != NULL; a = a->colorchain) {
- assert(a->co == co);
- newarc(nfa, a->type, sco, a->from, a->to);
- }
- }
- }
- }
- /*
- - colorchain - add this arc to the color chain of its color
- ^ static VOID colorchain(struct colormap *, struct arc *);
- */
- static VOID
- colorchain(cm, a)
- struct colormap *cm;
- struct arc *a;
- {
- struct colordesc *cd = &cm->cd[a->co];
- if (cd->arcs)
- cd->arcs->colorchain_rev = a;
- a->colorchain = cd->arcs;
- a->colorchain_rev = NULL;
- cd->arcs = a;
- }
- /*
- - uncolorchain - delete this arc from the color chain of its color
- ^ static VOID uncolorchain(struct colormap *, struct arc *);
- */
- static VOID
- uncolorchain(cm, a)
- struct colormap *cm;
- struct arc *a;
- {
- struct colordesc *cd = &cm->cd[a->co];
- struct arc *aa = a->colorchain_rev;
- if (aa == NULL) {
- assert(cd->arcs == a);
- cd->arcs = a->colorchain;
- } else {
- assert(aa->colorchain == a);
- aa->colorchain = a->colorchain;
- }
- if (a->colorchain)
- a->colorchain->colorchain_rev = aa;
- a->colorchain = NULL; /* paranoia */
- a->colorchain_rev = NULL;
- }
- /*
- - singleton - is this character in its own color?
- ^ static int singleton(struct colormap *, pchr c);
- */
- static int /* predicate */
- singleton(cm, c)
- struct colormap *cm;
- pchr c;
- {
- color co; /* color of c */
- co = GETCOLOR(cm, c);
- if (cm->cd[co].nchrs == 1 && cm->cd[co].sub == NOSUB)
- return 1;
- return 0;
- }
- /*
- - rainbow - add arcs of all full colors (but one) between specified states
- ^ static VOID rainbow(struct nfa *, struct colormap *, int, pcolor,
- ^ struct state *, struct state *);
- */
- static VOID
- rainbow(nfa, cm, type, but, from, to)
- struct nfa *nfa;
- struct colormap *cm;
- int type;
- pcolor but; /* COLORLESS if no exceptions */
- struct state *from;
- struct state *to;
- {
- struct colordesc *cd;
- struct colordesc *end = CDEND(cm);
- color co;
- for (cd = cm->cd, co = 0; cd < end && !CISERR(); cd++, co++)
- if (!UNUSEDCOLOR(cd) && cd->sub != co && co != but &&
- !(cd->flags&PSEUDO))
- newarc(nfa, type, co, from, to);
- }
- /*
- - colorcomplement - add arcs of complementary colors
- * The calling sequence ought to be reconciled with cloneouts().
- ^ static VOID colorcomplement(struct nfa *, struct colormap *, int,
- ^ struct state *, struct state *, struct state *);
- */
- static VOID
- colorcomplement(nfa, cm, type, of, from, to)
- struct nfa *nfa;
- struct colormap *cm;
- int type;
- struct state *of; /* complements of this guy's PLAIN outarcs */
- struct state *from;
- struct state *to;
- {
- struct colordesc *cd;
- struct colordesc *end = CDEND(cm);
- color co;
- assert(of != from);
- for (cd = cm->cd, co = 0; cd < end && !CISERR(); cd++, co++)
- if (!UNUSEDCOLOR(cd) && !(cd->flags&PSEUDO))
- if (findarc(of, PLAIN, co) == NULL)
- newarc(nfa, type, co, from, to);
- }
- #ifdef REG_DEBUG
- /*
- ^ #ifdef REG_DEBUG
- */
- /*
- - dumpcolors - debugging output
- ^ static VOID dumpcolors(struct colormap *, FILE *);
- */
- static VOID
- dumpcolors(cm, f)
- struct colormap *cm;
- FILE *f;
- {
- struct colordesc *cd;
- struct colordesc *end;
- color co;
- chr c;
- char *has;
- fprintf(f, "max %ldn", (long)cm->max);
- if (NBYTS > 1)
- fillcheck(cm, cm->tree, 0, f);
- end = CDEND(cm);
- for (cd = cm->cd + 1, co = 1; cd < end; cd++, co++) /* skip 0 */
- if (!UNUSEDCOLOR(cd)) {
- assert(cd->nchrs > 0);
- has = (cd->block != NULL) ? "#" : "";
- if (cd->flags&PSEUDO)
- fprintf(f, "#%2ld%s(ps): ", (long)co, has);
- else
- fprintf(f, "#%2ld%s(%2d): ", (long)co,
- has, cd->nchrs);
- /* it's hard to do this more efficiently */
- for (c = CHR_MIN; c < CHR_MAX; c++)
- if (GETCOLOR(cm, c) == co)
- dumpchr(c, f);
- assert(c == CHR_MAX);
- if (GETCOLOR(cm, c) == co)
- dumpchr(c, f);
- fprintf(f, "n");
- }
- }
- /*
- - fillcheck - check proper filling of a tree
- ^ static VOID fillcheck(struct colormap *, union tree *, int, FILE *);
- */
- static VOID
- fillcheck(cm, tree, level, f)
- struct colormap *cm;
- union tree *tree;
- int level; /* level number (top == 0) of this block */
- FILE *f;
- {
- int i;
- union tree *t;
- union tree *fillt = &cm->tree[level+1];
- assert(level < NBYTS-1); /* this level has pointers */
- for (i = BYTTAB-1; i >= 0; i--) {
- t = tree->tptr[i];
- if (t == NULL)
- fprintf(f, "NULL found in filled tree!n");
- else if (t == fillt)
- {}
- else if (level < NBYTS-2) /* more pointer blocks below */
- fillcheck(cm, t, level+1, f);
- }
- }
- /*
- - dumpchr - print a chr
- * Kind of char-centric but works well enough for debug use.
- ^ static VOID dumpchr(pchr, FILE *);
- */
- static VOID
- dumpchr(c, f)
- pchr c;
- FILE *f;
- {
- if (c == '\')
- fprintf(f, "\\");
- else if (c > ' ' && c <= '~')
- putc((char)c, f);
- else
- fprintf(f, "\u%04lx", (long)c);
- }
- /*
- ^ #endif
- */
- #endif /* ifdef REG_DEBUG */