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Diffstat (limited to 'z42.c')
| -rw-r--r-- | z42.c | 243 |
1 files changed, 243 insertions, 0 deletions
@@ -0,0 +1,243 @@ +/*@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 */ |