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author | stanton <stanton@noemail.net> | 1999-04-16 00:46:29 (GMT) |
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committer | stanton <stanton@noemail.net> | 1999-04-16 00:46:29 (GMT) |
commit | 98569293dc21e22480004e4e3f2ce85ec0bfd80f (patch) | |
tree | ce9959f2747257d98d52ec8d18bf3b0de99b9535 /generic/regc_color.c | |
parent | 6a4a1d8213f4de5bce0eaafa8f4d86117022bf1a (diff) | |
download | tcl-98569293dc21e22480004e4e3f2ce85ec0bfd80f.zip tcl-98569293dc21e22480004e4e3f2ce85ec0bfd80f.tar.gz tcl-98569293dc21e22480004e4e3f2ce85ec0bfd80f.tar.bz2 |
merged tcl 8.1 branch back into the main trunk
FossilOrigin-Name: f3b32fb71c9011ac220779bd9dbe5617c9dc87d9
Diffstat (limited to 'generic/regc_color.c')
-rw-r--r-- | generic/regc_color.c | 742 |
1 files changed, 742 insertions, 0 deletions
diff --git a/generic/regc_color.c b/generic/regc_color.c new file mode 100644 index 0000000..e86fea0 --- /dev/null +++ b/generic/regc_color.c @@ -0,0 +1,742 @@ +/* + * colorings of characters + * This file is #included by regcomp.c. + * + * 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->max >= 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 (sco == COLORLESS) { + return 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) + 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 & BYTMASK) == 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); */ + cd->arcs = a->colorchain; + a->co = sco; + /* colorchain(cm, a); */ + a->colorchain = scd->arcs; + scd->arcs = 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]; + + a->colorchain = cd->arcs; + 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; + + aa = cd->arcs; + if (aa == a) /* easy case */ + cd->arcs = a->colorchain; + else { + for (; aa != NULL && aa->colorchain != a; aa = aa->colorchain) + continue; + assert(aa != NULL); + aa->colorchain = a->colorchain; + } + a->colorchain = NULL; /* paranoia */ +} + +/* + - singleton - is this character in its own color? + ^ static int singleton(struct colormap *, pchr c); + */ +#if 0 +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; +} +#endif +/* + - 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 + +/* + - 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 %ld\n", (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 /* ifdef REG_DEBUG */ |