Tcl regex lib
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4094 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Ryan Norton
780
src/regex/regc_color.c
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780
src/regex/regc_color.c
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@@ -0,0 +1,780 @@
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/*
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* colorings of characters
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* This file is #included by regcomp.c.
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*
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* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
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*
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* Development of this software was funded, in part, by Cray Research Inc.,
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* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
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* Corporation, none of whom are responsible for the results. The author
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* thanks all of them.
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*
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* Redistribution and use in source and binary forms -- with or without
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* modification -- are permitted for any purpose, provided that
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* redistributions in source form retain this entire copyright notice and
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* indicate the origin and nature of any modifications.
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*
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* I'd appreciate being given credit for this package in the documentation
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* of software which uses it, but that is not a requirement.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Header$
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*
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*
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* Note that there are some incestuous relationships between this code and
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* NFA arc maintenance, which perhaps ought to be cleaned up sometime.
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*/
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#define CISERR() VISERR(cm->v)
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#define CERR(e) VERR(cm->v, (e))
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/*
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* initcm - set up new colormap
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*/
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static void
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initcm(struct vars * v,
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struct colormap * cm)
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{
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int i;
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int j;
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union tree *t;
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union tree *nextt;
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struct colordesc *cd;
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cm->magic = CMMAGIC;
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cm->v = v;
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cm->ncds = NINLINECDS;
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cm->cd = cm->cdspace;
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cm->max = 0;
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cm->free = 0;
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cd = cm->cd; /* cm->cd[WHITE] */
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cd->sub = NOSUB;
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cd->arcs = NULL;
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cd->flags = 0;
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cd->nchrs = CHR_MAX - CHR_MIN + 1;
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/* upper levels of tree */
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for (t = &cm->tree[0], j = NBYTS - 1; j > 0; t = nextt, j--)
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{
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nextt = t + 1;
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for (i = BYTTAB - 1; i >= 0; i--)
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t->tptr[i] = nextt;
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}
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/* bottom level is solid white */
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t = &cm->tree[NBYTS - 1];
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for (i = BYTTAB - 1; i >= 0; i--)
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t->tcolor[i] = WHITE;
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cd->block = t;
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}
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/*
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* freecm - free dynamically-allocated things in a colormap
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*/
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static void
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freecm(struct colormap * cm)
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{
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size_t i;
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union tree *cb;
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cm->magic = 0;
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if (NBYTS > 1)
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cmtreefree(cm, cm->tree, 0);
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for (i = 1; i <= cm->max; i++) /* skip WHITE */
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if (!UNUSEDCOLOR(&cm->cd[i]))
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{
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cb = cm->cd[i].block;
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if (cb != NULL)
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FREE(cb);
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}
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if (cm->cd != cm->cdspace)
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FREE(cm->cd);
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}
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/*
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* cmtreefree - free a non-terminal part of a colormap tree
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*/
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static void
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cmtreefree(struct colormap * cm,
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union tree * tree,
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int level) /* level number (top == 0) of this block */
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{
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int i;
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union tree *t;
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union tree *fillt = &cm->tree[level + 1];
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union tree *cb;
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assert(level < NBYTS - 1); /* this level has pointers */
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for (i = BYTTAB - 1; i >= 0; i--)
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{
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t = tree->tptr[i];
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assert(t != NULL);
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if (t != fillt)
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{
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if (level < NBYTS - 2)
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{ /* more pointer blocks below */
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cmtreefree(cm, t, level + 1);
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FREE(t);
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}
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else
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{ /* color block below */
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cb = cm->cd[t->tcolor[0]].block;
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if (t != cb) /* not a solid block */
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FREE(t);
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}
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}
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}
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}
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/*
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* setcolor - set the color of a character in a colormap
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*/
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static color /* previous color */
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setcolor(struct colormap * cm,
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chr c,
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pcolor co)
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{
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uchr uc = c;
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int shift;
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int level;
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int b;
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int bottom;
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union tree *t;
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union tree *newt;
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union tree *fillt;
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union tree *lastt;
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union tree *cb;
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color prev;
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assert(cm->magic == CMMAGIC);
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if (CISERR() || co == COLORLESS)
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return COLORLESS;
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t = cm->tree;
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for (level = 0, shift = BYTBITS * (NBYTS - 1); shift > 0;
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level++, shift -= BYTBITS)
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{
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b = (uc >> shift) & BYTMASK;
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lastt = t;
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t = lastt->tptr[b];
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assert(t != NULL);
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fillt = &cm->tree[level + 1];
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bottom = (shift <= BYTBITS) ? 1 : 0;
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cb = (bottom) ? cm->cd[t->tcolor[0]].block : fillt;
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if (t == fillt || t == cb)
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{ /* must allocate a new block */
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newt = (union tree *) MALLOC((bottom) ?
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sizeof(struct colors) : sizeof(struct ptrs));
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if (newt == NULL)
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{
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CERR(REG_ESPACE);
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return COLORLESS;
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}
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if (bottom)
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memcpy(VS(newt->tcolor), VS(t->tcolor),
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BYTTAB * sizeof(color));
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else
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memcpy(VS(newt->tptr), VS(t->tptr),
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BYTTAB * sizeof(union tree *));
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t = newt;
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lastt->tptr[b] = t;
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}
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}
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b = uc & BYTMASK;
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prev = t->tcolor[b];
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t->tcolor[b] = (color) co;
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return prev;
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}
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/*
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* maxcolor - report largest color number in use
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*/
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static color
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maxcolor(struct colormap * cm)
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{
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if (CISERR())
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return COLORLESS;
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return (color) cm->max;
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}
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/*
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* newcolor - find a new color (must be subject of setcolor at once)
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* Beware: may relocate the colordescs.
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*/
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static color /* COLORLESS for error */
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newcolor(struct colormap * cm)
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{
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struct colordesc *cd;
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struct colordesc *new;
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size_t n;
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if (CISERR())
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return COLORLESS;
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if (cm->free != 0)
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{
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assert(cm->free > 0);
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assert((size_t) cm->free < cm->ncds);
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cd = &cm->cd[cm->free];
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assert(UNUSEDCOLOR(cd));
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assert(cd->arcs == NULL);
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cm->free = cd->sub;
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}
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else if (cm->max < cm->ncds - 1)
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{
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cm->max++;
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cd = &cm->cd[cm->max];
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}
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else
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{
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/* oops, must allocate more */
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n = cm->ncds * 2;
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if (cm->cd == cm->cdspace)
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{
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new = (struct colordesc *) MALLOC(n *
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sizeof(struct colordesc));
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if (new != NULL)
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memcpy(VS(new), VS(cm->cdspace), cm->ncds *
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sizeof(struct colordesc));
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}
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else
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new = (struct colordesc *) REALLOC(cm->cd,
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n * sizeof(struct colordesc));
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if (new == NULL)
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{
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CERR(REG_ESPACE);
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return COLORLESS;
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}
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cm->cd = new;
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cm->ncds = n;
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assert(cm->max < cm->ncds - 1);
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cm->max++;
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cd = &cm->cd[cm->max];
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}
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cd->nchrs = 0;
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cd->sub = NOSUB;
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cd->arcs = NULL;
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cd->flags = 0;
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cd->block = NULL;
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return (color) (cd - cm->cd);
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}
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/*
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* freecolor - free a color (must have no arcs or subcolor)
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*/
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static void
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freecolor(struct colormap * cm,
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pcolor co)
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{
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struct colordesc *cd = &cm->cd[co];
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color pco,
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nco; /* for freelist scan */
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assert(co >= 0);
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if (co == WHITE)
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return;
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assert(cd->arcs == NULL);
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assert(cd->sub == NOSUB);
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assert(cd->nchrs == 0);
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cd->flags = FREECOL;
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if (cd->block != NULL)
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{
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FREE(cd->block);
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cd->block = NULL; /* just paranoia */
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}
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if ((size_t) co == cm->max)
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{
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while (cm->max > WHITE && UNUSEDCOLOR(&cm->cd[cm->max]))
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cm->max--;
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assert(cm->free >= 0);
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while ((size_t) cm->free > cm->max)
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cm->free = cm->cd[cm->free].sub;
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if (cm->free > 0)
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{
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assert(cm->free < cm->max);
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pco = cm->free;
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nco = cm->cd[pco].sub;
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while (nco > 0)
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if ((size_t) nco > cm->max)
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{
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/* take this one out of freelist */
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nco = cm->cd[nco].sub;
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cm->cd[pco].sub = nco;
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}
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else
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{
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assert(nco < cm->max);
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pco = nco;
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nco = cm->cd[pco].sub;
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}
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}
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}
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else
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{
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cd->sub = cm->free;
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cm->free = (color) (cd - cm->cd);
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}
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}
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/*
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* pseudocolor - allocate a false color, to be managed by other means
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*/
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static color
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pseudocolor(struct colormap * cm)
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{
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color co;
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co = newcolor(cm);
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if (CISERR())
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return COLORLESS;
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cm->cd[co].nchrs = 1;
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cm->cd[co].flags = PSEUDO;
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return co;
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}
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/*
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* subcolor - allocate a new subcolor (if necessary) to this chr
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*/
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static color
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subcolor(struct colormap * cm, chr c)
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{
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color co; /* current color of c */
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color sco; /* new subcolor */
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co = GETCOLOR(cm, c);
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sco = newsub(cm, co);
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if (CISERR())
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return COLORLESS;
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assert(sco != COLORLESS);
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if (co == sco) /* already in an open subcolor */
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return co; /* rest is redundant */
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cm->cd[co].nchrs--;
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cm->cd[sco].nchrs++;
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setcolor(cm, c, sco);
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return sco;
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}
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/*
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* newsub - allocate a new subcolor (if necessary) for a color
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*/
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static color
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newsub(struct colormap * cm,
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pcolor co)
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{
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color sco; /* new subcolor */
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sco = cm->cd[co].sub;
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if (sco == NOSUB)
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{ /* color has no open subcolor */
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if (cm->cd[co].nchrs == 1) /* optimization */
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return co;
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sco = newcolor(cm); /* must create subcolor */
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if (sco == COLORLESS)
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{
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assert(CISERR());
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return COLORLESS;
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}
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cm->cd[co].sub = sco;
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cm->cd[sco].sub = sco; /* open subcolor points to self */
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}
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assert(sco != NOSUB);
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return sco;
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}
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/*
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* subrange - allocate new subcolors to this range of chrs, fill in arcs
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*/
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static void
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subrange(struct vars * v,
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chr from,
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chr to,
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struct state * lp,
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struct state * rp)
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{
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uchr uf;
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int i;
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assert(from <= to);
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/* first, align "from" on a tree-block boundary */
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uf = (uchr) from;
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i = (int) (((uf + BYTTAB - 1) & (uchr) ~BYTMASK) - uf);
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for (; from <= to && i > 0; i--, from++)
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newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp);
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if (from > to) /* didn't reach a boundary */
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return;
|
||||
|
||||
/* deal with whole blocks */
|
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for (; to - from >= BYTTAB; from += BYTTAB)
|
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subblock(v, from, lp, rp);
|
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|
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/* clean up any remaining partial table */
|
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for (; from <= to; from++)
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newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp);
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}
|
||||
|
||||
/*
|
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* subblock - allocate new subcolors for one tree block of chrs, fill in arcs
|
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*/
|
||||
static void
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subblock(struct vars * v,
|
||||
chr 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 */
|
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t = cm->tree;
|
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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 * 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 * 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 * 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 /* predicate */
|
||||
singleton(struct colormap * cm,
|
||||
chr 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 * 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 * 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 * 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 * 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(chr c,
|
||||
FILE *f)
|
||||
{
|
||||
if (c == '\\')
|
||||
fprintf(f, "\\\\");
|
||||
else if (c > ' ' && c <= '~')
|
||||
putc((char) c, f);
|
||||
else
|
||||
fprintf(f, "\\u%04lx", (long) c);
|
||||
}
|
||||
|
||||
#endif /* REG_DEBUG */
|
||||
Reference in New Issue
Block a user