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Diff for /mandoc/term_ps.c between version 1.1 and 1.11

version 1.1, 2010/06/08 13:22:37 version 1.11, 2010/06/25 18:53:14
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 /*      $Id$ */  /*      $Id$ */
 /*  /*
  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>   * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
  *   *
  * Permission to use, copy, modify, and distribute this software for any   * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above   * purpose with or without fee is hereby granted, provided that the above
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 #include "config.h"  #include "config.h"
 #endif  #endif
   
   #include <sys/param.h>
   
   #include <assert.h>
   #include <stdarg.h>
   #include <stdio.h>
 #include <stdlib.h>  #include <stdlib.h>
   #include <string.h>
   
 #include "out.h"  #include "out.h"
 #include "main.h"  #include "main.h"
 #include "term.h"  #include "term.h"
   
   #define PS_CHAR_WIDTH     6
   #define PS_CHAR_HEIGHT    12
   #define PS_CHAR_TOPMARG  (792 - 24)
   #define PS_CHAR_TOP      (PS_CHAR_TOPMARG - 36)
   #define PS_CHAR_LEFT      36
   #define PS_CHAR_BOTMARG   24
   #define PS_CHAR_BOT      (PS_CHAR_BOTMARG + 36)
   
   #define PS_BUFSLOP        128
   #define PS_GROWBUF(p, sz) \
           do if ((p)->engine.ps.psmargcur + (sz) > \
                           (p)->engine.ps.psmargsz) { \
                   (p)->engine.ps.psmargsz += /* CONSTCOND */ \
                           MAX(PS_BUFSLOP, (sz)); \
                   (p)->engine.ps.psmarg = realloc \
                           ((p)->engine.ps.psmarg,  \
                            (p)->engine.ps.psmargsz); \
                   if (NULL == (p)->engine.ps.psmarg) { \
                           perror(NULL); \
                           exit(EXIT_FAILURE); \
                   } \
           } while (/* CONSTCOND */ 0)
   
   
   static  void              ps_letter(struct termp *, char);
   static  void              ps_begin(struct termp *);
   static  void              ps_end(struct termp *);
   static  void              ps_advance(struct termp *, size_t);
   static  void              ps_endline(struct termp *);
   static  void              ps_fclose(struct termp *);
   static  size_t            ps_width(const struct termp *, char);
   static  void              ps_pclose(struct termp *);
   static  void              ps_pletter(struct termp *, char);
   static  void              ps_printf(struct termp *, const char *, ...);
   static  void              ps_putchar(struct termp *, char);
   static  void              ps_setfont(struct termp *, enum termfont);
   
   
 void *  void *
 ps_alloc(void)  ps_alloc(void)
 {  {
Line 32  ps_alloc(void)
Line 76  ps_alloc(void)
         if (NULL == (p = term_alloc(TERMENC_ASCII)))          if (NULL == (p = term_alloc(TERMENC_ASCII)))
                 return(NULL);                  return(NULL);
   
           p->defrmargin = 78;
           p->tabwidth = 5;
   
         p->type = TERMTYPE_PS;          p->type = TERMTYPE_PS;
           p->letter = ps_letter;
           p->begin = ps_begin;
           p->end = ps_end;
           p->advance = ps_advance;
           p->endline = ps_endline;
           p->width = ps_width;
         return(p);          return(p);
 }  }
   
Line 40  ps_alloc(void)
Line 93  ps_alloc(void)
 void  void
 ps_free(void *arg)  ps_free(void *arg)
 {  {
           struct termp    *p;
   
         term_free((struct termp *)arg);          p = (struct termp *)arg;
   
           if (p->engine.ps.psmarg)
                   free(p->engine.ps.psmarg);
   
           term_free(p);
   }
   
   
   static void
   ps_printf(struct termp *p, const char *fmt, ...)
   {
           va_list          ap;
           int              pos;
   
           va_start(ap, fmt);
   
           /*
            * If we're running in regular mode, then pipe directly into
            * vprintf().  If we're processing margins, then push the data
            * into our growable margin buffer.
            */
   
           if ( ! (PS_MARGINS & p->engine.ps.psstate)) {
                   vprintf(fmt, ap);
                   va_end(ap);
                   return;
           }
   
           /*
            * XXX: I assume that the in-margin print won't exceed
            * PS_BUFSLOP (128 bytes), which is reasonable but still an
            * assumption that will cause pukeage if it's not the case.
            */
   
           PS_GROWBUF(p, PS_BUFSLOP);
   
           pos = (int)p->engine.ps.psmargcur;
           vsnprintf(&p->engine.ps.psmarg[pos], PS_BUFSLOP, fmt, ap);
           p->engine.ps.psmargcur = strlen(p->engine.ps.psmarg);
   
           va_end(ap);
   }
   
   
   static void
   ps_putchar(struct termp *p, char c)
   {
           int              pos;
   
           /* See ps_printf(). */
   
           if ( ! (PS_MARGINS & p->engine.ps.psstate)) {
                   putchar(c);
                   return;
           }
   
           PS_GROWBUF(p, 2);
   
           pos = (int)p->engine.ps.psmargcur++;
           p->engine.ps.psmarg[pos++] = c;
           p->engine.ps.psmarg[pos] = '\0';
   }
   
   
   /* ARGSUSED */
   static void
   ps_end(struct termp *p)
   {
   
           /*
            * At the end of the file, do one last showpage.  This is the
            * same behaviour as groff(1) and works for multiple pages as
            * well as just one.
            */
   
           assert(0 == p->engine.ps.psstate);
           assert('\0' == p->engine.ps.last);
           assert(p->engine.ps.psmarg && p->engine.ps.psmarg[0]);
           printf("%s", p->engine.ps.psmarg);
           printf("showpage\n");
           printf("%s\n", "%%EOF");
   }
   
   
   static void
   ps_begin(struct termp *p)
   {
   
           /*
            * Print margins into margin buffer.  Nothing gets output to the
            * screen yet, so we don't need to initialise the primary state.
            */
   
           if (p->engine.ps.psmarg) {
                   assert(p->engine.ps.psmargsz);
                   p->engine.ps.psmarg[0] = '\0';
           }
   
           p->engine.ps.psmargcur = 0;
           p->engine.ps.psstate = PS_MARGINS;
           p->engine.ps.pscol = PS_CHAR_LEFT;
           p->engine.ps.psrow = PS_CHAR_TOPMARG;
   
           ps_setfont(p, TERMFONT_NONE);
   
           (*p->headf)(p, p->argf);
           (*p->endline)(p);
   
           p->engine.ps.pscol = PS_CHAR_LEFT;
           p->engine.ps.psrow = PS_CHAR_BOTMARG;
   
           (*p->footf)(p, p->argf);
           (*p->endline)(p);
   
           p->engine.ps.psstate &= ~PS_MARGINS;
   
           assert(0 == p->engine.ps.psstate);
           assert(p->engine.ps.psmarg);
           assert('\0' != p->engine.ps.psmarg[0]);
   
           /*
            * Print header and initialise page state.  Following this,
            * stuff gets printed to the screen, so make sure we're sane.
            */
   
           printf("%s\n", "%!PS");
           ps_setfont(p, TERMFONT_NONE);
           p->engine.ps.pscol = PS_CHAR_LEFT;
           p->engine.ps.psrow = PS_CHAR_TOP;
   }
   
   
   static void
   ps_pletter(struct termp *p, char c)
   {
   
           /*
            * If we're not in a PostScript "word" context, then open one
            * now at the current cursor.
            */
   
           if ( ! (PS_INLINE & p->engine.ps.psstate)) {
                   ps_printf(p, "%zu %zu moveto\n(",
                                   p->engine.ps.pscol,
                                   p->engine.ps.psrow);
                   p->engine.ps.psstate |= PS_INLINE;
           }
   
           /*
            * We need to escape these characters as per the PostScript
            * specification.  We would also escape non-graphable characters
            * (like tabs), but none of them would get to this point and
            * it's superfluous to abort() on them.
            */
   
           switch (c) {
           case ('('):
                   /* FALLTHROUGH */
           case (')'):
                   /* FALLTHROUGH */
           case ('\\'):
                   ps_putchar(p, '\\');
                   break;
           default:
                   break;
           }
   
           /* Write the character and adjust where we are on the page. */
   
           ps_putchar(p, c);
           p->engine.ps.pscol += PS_CHAR_WIDTH;
   }
   
   
   static void
   ps_pclose(struct termp *p)
   {
   
           /*
            * Spit out that we're exiting a word context (this is a
            * "partial close" because we don't check the last-char buffer
            * or anything).
            */
   
           if ( ! (PS_INLINE & p->engine.ps.psstate))
                   return;
   
           ps_printf(p, ") show\n");
           p->engine.ps.psstate &= ~PS_INLINE;
   }
   
   
   static void
   ps_fclose(struct termp *p)
   {
   
           /*
            * Strong closure: if we have a last-char, spit it out after
            * checking that we're in the right font mode.  This will of
            * course open a new scope, if applicable.
            *
            * Following this, close out any scope that's open.
            */
   
           if ('\0' != p->engine.ps.last) {
                   if (p->engine.ps.lastf != TERMFONT_NONE) {
                           ps_pclose(p);
                           ps_setfont(p, TERMFONT_NONE);
                   }
                   ps_pletter(p, p->engine.ps.last);
                   p->engine.ps.last = '\0';
           }
   
           if ( ! (PS_INLINE & p->engine.ps.psstate))
                   return;
   
           ps_pclose(p);
   }
   
   
   static void
   ps_letter(struct termp *p, char c)
   {
           char            cc;
   
           /*
            * State machine dictates whether to buffer the last character
            * or not.  Basically, encoded words are detected by checking if
            * we're an "8" and switching on the buffer.  Then we put "8" in
            * our buffer, and on the next charater, flush both character
            * and buffer.  Thus, "regular" words are detected by having a
            * regular character and a regular buffer character.
            */
   
           if ('\0' == p->engine.ps.last) {
                   assert(8 != c);
                   p->engine.ps.last = c;
                   return;
           } else if (8 == p->engine.ps.last) {
                   assert(8 != c);
                   p->engine.ps.last = '\0';
           } else if (8 == c) {
                   assert(8 != p->engine.ps.last);
                   if ('_' == p->engine.ps.last) {
                           if (p->engine.ps.lastf != TERMFONT_UNDER) {
                                   ps_pclose(p);
                                   ps_setfont(p, TERMFONT_UNDER);
                           }
                   } else if (p->engine.ps.lastf != TERMFONT_BOLD) {
                           ps_pclose(p);
                           ps_setfont(p, TERMFONT_BOLD);
                   }
                   p->engine.ps.last = c;
                   return;
           } else {
                   if (p->engine.ps.lastf != TERMFONT_NONE) {
                           ps_pclose(p);
                           ps_setfont(p, TERMFONT_NONE);
                   }
                   cc = p->engine.ps.last;
                   p->engine.ps.last = c;
                   c = cc;
           }
   
           ps_pletter(p, c);
   }
   
   
   static void
   ps_advance(struct termp *p, size_t len)
   {
   
           /*
            * Advance some spaces.  This can probably be made smarter,
            * i.e., to have multiple space-separated words in the same
            * scope, but this is easier:  just close out the current scope
            * and readjust our column settings.
            */
   
           ps_fclose(p);
           p->engine.ps.pscol += len ? len * PS_CHAR_WIDTH : 0;
   }
   
   
   static void
   ps_endline(struct termp *p)
   {
   
           /* Close out any scopes we have open: we're at eoln. */
   
           ps_fclose(p);
   
           /*
            * If we're in the margin, don't try to recalculate our current
            * row.  XXX: if the column tries to be fancy with multiple
            * lines, we'll do nasty stuff.
            */
   
           if (PS_MARGINS & p->engine.ps.psstate)
                   return;
   
           /*
            * Put us down a line.  If we're at the page bottom, spit out a
            * showpage and restart our row.
            */
   
           p->engine.ps.pscol = PS_CHAR_LEFT;
           if (p->engine.ps.psrow >= PS_CHAR_HEIGHT + PS_CHAR_BOT) {
                   p->engine.ps.psrow -= PS_CHAR_HEIGHT;
                   return;
           }
   
           assert(p->engine.ps.psmarg && p->engine.ps.psmarg[0]);
           printf("%s", p->engine.ps.psmarg);
           printf("showpage\n");
           p->engine.ps.psrow = PS_CHAR_TOP;
   }
   
   
   static void
   ps_setfont(struct termp *p, enum termfont f)
   {
   
           if (TERMFONT_BOLD == f)
                   ps_printf(p, "/Courier-Bold\n");
           else if (TERMFONT_UNDER == f)
                   ps_printf(p, "/Courier-Oblique\n");
           else
                   ps_printf(p, "/Courier\n");
   
           ps_printf(p, "10 selectfont\n");
           p->engine.ps.lastf = f;
   }
   
   
   static size_t
   ps_width(const struct termp *p, char c)
   {
   
           return(1);
 }  }
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