Lout 3.17.

git-svn-id: http://svn.savannah.nongnu.org/svn/lout/trunk@2 9365b830-b601-4143-9ba8-b4a8e2c3339c

1 files changed, 243 insertions, 0 deletions

diff --git a/z42.c b/z42.c
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+/*@z42.c:Colour Service:ColourChange, ColourCommand@**************************/
+/*                                                                           */
+/*  THE LOUT DOCUMENT FORMATTING SYSTEM (VERSION 3.17)                       */
+/*  COPYRIGHT (C) 1991, 1999 Jeffrey H. Kingston                             */
+/*                                                                           */
+/*  Jeffrey H. Kingston (jeff@cs.usyd.edu.au)                                */
+/*  Basser Department of Computer Science                                    */
+/*  The University of Sydney 2006                                            */
+/*  AUSTRALIA                                                                */
+/*                                                                           */
+/*  This program is free software; you can redistribute it and/or modify     */
+/*  it under the terms of the GNU General Public License as published by     */
+/*  the Free Software Foundation; either Version 2, or (at your option)      */
+/*  any later version.                                                       */
+/*                                                                           */
+/*  This program is distributed in the hope that it will be useful,          */
+/*  but WITHOUT ANY WARRANTY; without even the implied warranty of           */
+/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            */
+/*  GNU General Public License for more details.                             */
+/*                                                                           */
+/*  You should have received a copy of the GNU General Public License        */
+/*  along with this program; if not, write to the Free Software              */
+/*  Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA   */
+/*                                                                           */
+/*  FILE:         z42.c                                                      */
+/*  MODULE:       Colour Service                                             */
+/*  EXTERNS:      ColourChange(), ColourCommand()                            */
+/*                                                                           */
+/*****************************************************************************/
+#include "externs.h"
+#define INIT_COLOUR_NUM	100
+
+
+/*****************************************************************************/
+/*                                                                           */
+/*  COLOUR_TABLE                                                             */
+/*                                                                           */
+/*  A symbol table permitting access to colour records by number or name.    */
+/*  The table will automatically enlarge to accept any number of entries,    */
+/*  but there is an arbitrary limit of 65535 colours imposed so that colour  */
+/*  numbers can be stored in 16 bit fields.                                  */
+/*                                                                           */
+/*     ctab_new(newsize)                 New empty table, newsize capacity   */
+/*     ctab_insert(x, &S)                Insert new colour object x into S   */
+/*     ctab_retrieve(str, S)             Retrieve colour object of name str  */
+/*     ctab_num(S, num)                  Retrieve colour object, number num  */
+/*     ctab_debug(S, fp)                 Debug print of table S to file fp   */
+/*                                                                           */
+/*****************************************************************************/
+
+typedef struct
+{ int coltab_size;				/* size of table             */
+  int coltab_count;				/* number of colours held    */
+  struct coltab_rec
+  {	OBJECT	by_number;			/* colour record by number   */
+	OBJECT	by_name_hash;			/* colour record by name     */
+  } coltab[1];
+} *COLOUR_TABLE;
+
+#define	ctab_size(S)	(S)->coltab_size
+#define	ctab_count(S)	(S)->coltab_count
+#define	ctab_num(S, i)	(S)->coltab[i].by_number
+#define	ctab_name(S, i)	(S)->coltab[i].by_name_hash
+
+#define hash(pos, str, S)						\
+{ FULL_CHAR *p = str;							\
+  pos = *p++;								\
+  while( *p ) pos += *p++;						\
+  pos = pos % ctab_size(S);						\
+}
+
+static COLOUR_TABLE ctab_new(int newsize)
+{ COLOUR_TABLE S;  int i;
+  ifdebug(DMA, D, DebugRegisterUsage(MEM_COLOUR_TAB, 1,
+    2*sizeof(int) + newsize * sizeof(struct coltab_rec)));
+  S = (COLOUR_TABLE) malloc(2*sizeof(int) + newsize * sizeof(struct coltab_rec));
+  if( S == (COLOUR_TABLE) NULL )
+    Error(42, 1, "ran out of memory when enlarging colour table",
+      FATAL, no_fpos);
+  ctab_size(S) = newsize;
+  ctab_count(S) = 0;
+  for( i = 0;  i < newsize;  i++ )
+  { ctab_num(S, i) = ctab_name(S, i) = nilobj;
+  }
+  return S;
+} /* end ctab_new */
+
+static void ctab_insert(OBJECT x, COLOUR_TABLE *S);
+
+static COLOUR_TABLE ctab_rehash(COLOUR_TABLE S, int newsize)
+{ COLOUR_TABLE NewS;  int i;
+  NewS = ctab_new(newsize);
+  for( i = 1;  i <= ctab_count(S);  i++ )
+     ctab_insert(ctab_num(S, i), &NewS);
+  for( i = 0;  i < ctab_size(S);  i++ )
+  { if( ctab_name(S, i) != nilobj )  DisposeObject(ctab_name(S, i));
+  }
+  ifdebug(DMA, D, DebugRegisterUsage(MEM_COLOUR_TAB, -1,
+    -(2*sizeof(int) + ctab_size(S) * sizeof(struct coltab_rec))));
+  free(S);
+  return NewS;
+} /* end ctab_rehash */
+
+static void ctab_insert(OBJECT x, COLOUR_TABLE *S)
+{ int pos, num;					
+  if( ctab_count(*S) == ctab_size(*S) - 1 )	/* one less since 0 unused */
+    *S = ctab_rehash(*S, 2*ctab_size(*S));
+  num = ++ctab_count(*S);
+  if( num > MAX_COLOUR )
+    Error(42, 2, "too many colours (maximum is %d)",
+      FATAL, &fpos(x), MAX_COLOUR);
+  hash(pos, string(x), *S);
+  if( ctab_name(*S, pos) == nilobj )  New(ctab_name(*S, pos), ACAT);
+  Link(ctab_name(*S, pos), x);
+  word_colour(x) = num;
+  ctab_num(*S, num) = x;
+} /* end ctab_insert */
+
+static OBJECT ctab_retrieve(FULL_CHAR *str, COLOUR_TABLE S)
+{ OBJECT x, link, y;  int pos;
+  hash(pos, str, S);
+  x = ctab_name(S, pos);
+  if( x == nilobj )  return nilobj;
+  for( link = Down(x);  link != x;  link = NextDown(link) )
+  { Child(y, link);
+    if( StringEqual(str, string(y)) )  return y;
+  }
+  return nilobj;
+} /* end ctab_retrieve */
+
+#if DEBUG_ON
+static void ctab_debug(COLOUR_TABLE S, FILE *fp)
+{ int i;  OBJECT x, link, y;
+  fprintf(fp, "  table size: %d;  current number of colours: %d\n",
+    ctab_size(S), ctab_count(S));
+  for( i = 0;  i < ctab_size(S);  i++ )
+  { x = ctab_num(S, i);
+    fprintf(fp, "  ctab_num(S, %d) = %s\n", i,
+      x == nilobj ? AsciiToFull("<nilobj>") :
+      is_word(type(x)) ? string(x) : AsciiToFull("not WORD!"));
+  }
+  fprintf(fp, "\n");
+  for( i = 0;  i < ctab_size(S);  i++ )
+  { x = ctab_name(S, i);
+    fprintf(fp, "ctab_name(S, %d) =", i);
+    if( x == nilobj )
+      fprintf(fp, " <nilobj>");
+    else if( type(x) != ACAT )
+      fprintf(fp, " not ACAT!");
+    else for( link = Down(x);  link != x;  link = NextDown(link) )
+    { Child(y, link);
+      fprintf(fp, " %s",
+	is_word(type(y)) ? string(y) : AsciiToFull("not-WORD!"));
+    }
+    fprintf(fp, "\n");
+  }
+} /* end ctab_debug */
+#endif
+
+
+static COLOUR_TABLE col_tab;
+
+/*****************************************************************************/
+/*                                                                           */
+/*  ColourInit()                                                             */
+/*                                                                           */
+/*  Initialize this module.                                                  */
+/*                                                                           */
+/*****************************************************************************/
+
+void ColourInit(void)
+{ col_tab = ctab_new(INIT_COLOUR_NUM);
+} /* end ColourInit */
+
+
+/*****************************************************************************/
+/*                                                                           */
+/*  ColourChange(style, x)                                                   */
+/*                                                                           */
+/*  Change the current style to contain the colour of colour command x.      */
+/*                                                                           */
+/*****************************************************************************/
+
+void ColourChange(STYLE *style, OBJECT x)
+{ OBJECT cname;
+  debug2(DCO, D, "ColourChange(%s, %s)", EchoStyle(style), EchoObject(x));
+
+  /* if argument is not a word, fail and exit */
+  if( !is_word(type(x)) )
+  { Error(42, 3, "%s ignored (illegal left parameter)", WARN, &fpos(x),
+      KW_COLOUR);
+    debug0(DCO, D, "ColourChange returning (colour unchanged)");
+    return;
+  }
+
+  /* if argument is empty, fail and exit */
+  if( StringEqual(string(x), STR_EMPTY) )
+  { if( BackEnd != PLAINTEXT )
+      Error(42, 4, "%s ignored (empty left parameter)", WARN, &fpos(x),
+        KW_COLOUR);
+    debug0(DCO, D, "ColourChange returning (colour unchanged)");
+    return;
+  }
+
+  /* if argument is nochange, do nothing */
+  if( StringEqual(string(x), STR_COLOUR_NOCHANGE) )
+  { debug0(DCO, D, "ColourChange returning (colour nochange)");
+    return;
+  }
+
+  /* retrieve colour command if present, else insert it */
+  { cname = ctab_retrieve(string(x), col_tab);
+    if( cname == nilobj )
+    { cname = MakeWord(type(x), string(x), &fpos(x));
+      ctab_insert(cname, &col_tab);
+      colour(*style) = word_colour(cname);
+    }
+    else colour(*style) = word_colour(cname);
+  }
+
+  debug1(DCO, D, "ColourChange returning (colour = %s)", string(cname));
+  ifdebug(DCO, DD, ctab_debug(col_tab, stderr));
+} /* ColourChange */
+
+
+/*@::ColourCommand()@*********************************************************/
+/*                                                                           */
+/*  FULL_CHAR *ColourCommand(cnum)                                           */
+/*                                                                           */
+/*  Return the PostScript command for producing colour cnum.                 */
+/*                                                                           */
+/*****************************************************************************/
+
+FULL_CHAR *ColourCommand(COLOUR_NUM cnum)
+{ FULL_CHAR *res;
+  debug1(DCO, D, "ColourCommand(%d)", cnum);
+  assert( cnum > 0 && cnum <= ctab_count(col_tab), "ColourCommand: number" );
+
+  res = string(ctab_num(col_tab, cnum));
+
+  debug1(DCO, D, "ColourCommand returning %s", res);
+  return res;
+} /* end ColourCommand */