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/* $Id: term_ps.c,v 1.3 2010/06/08 15:06:01 kristaps Exp $ */
/*
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "out.h"
#include "main.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)
static void ps_letter(struct termp *, char);
static void ps_begin(struct termp *);
static void ps_end(struct termp *);
static void ps_pageopen(struct termp *);
static void ps_advance(struct termp *, size_t);
static void ps_endline(struct termp *);
void *
ps_alloc(void)
{
struct termp *p;
if (NULL == (p = term_alloc(TERMENC_ASCII)))
return(NULL);
p->type = TERMTYPE_PS;
p->letter = ps_letter;
p->begin = ps_begin;
p->end = ps_end;
p->advance = ps_advance;
p->endline = ps_endline;
return(p);
}
void
ps_free(void *arg)
{
term_free((struct termp *)arg);
}
/* ARGSUSED */
static void
ps_end(struct termp *p)
{
printf("%s\n", "%%EOF");
}
static void
ps_begin(struct termp *p)
{
/*
* Emit the standard PostScript prologue, set our initial page
* position, then run pageopen() on the initial page.
*/
printf("%s\n", "%!PS");
printf("%s\n", "/Courier");
printf("%s\n", "10 selectfont");
p->engine.ps.pspage = 1;
p->engine.ps.psstate = 0;
ps_pageopen(p);
}
static void
ps_letter(struct termp *p, char c)
{
if ( ! (PS_INLINE & p->engine.ps.psstate)) {
/*
* If we're not in a PostScript "word" context, then
* open one now at the current cursor.
*/
printf("%zu %zu moveto\n",
p->engine.ps.pscol,
p->engine.ps.psrow);
putchar('(');
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 ('\\'):
putchar('\\');
break;
default:
break;
}
/* Write the character and adjust where we are on the page. */
putchar(c);
p->engine.ps.pscol += PS_CHAR_WIDTH;
}
/*
* Open a page. This is only used for -Tps at the moment. It opens a
* page context, printing the header and the footer. THE OUTPUT BUFFER
* MUST BE EMPTY. If it is not, output will ghost on the next line and
* we'll be all gross and out of state.
*/
static void
ps_pageopen(struct termp *p)
{
assert(TERMTYPE_PS == p->type);
assert(0 == p->engine.ps.psstate);
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_TOPMARG;
p->engine.ps.psstate |= PS_MARGINS;
(*p->headf)(p, p->argf);
(*p->endline)(p);
p->engine.ps.psstate &= ~PS_MARGINS;
assert(0 == p->engine.ps.psstate);
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_BOTMARG;
p->engine.ps.psstate |= PS_MARGINS;
(*p->footf)(p, p->argf);
(*p->endline)(p);
p->engine.ps.psstate &= ~PS_MARGINS;
assert(0 == p->engine.ps.psstate);
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_TOP;
}
static void
ps_advance(struct termp *p, size_t len)
{
if (PS_INLINE & p->engine.ps.psstate) {
/* Dump out any existing line scope. */
printf(") show\n");
p->engine.ps.psstate &= ~PS_INLINE;
}
p->engine.ps.pscol += len ? len * PS_CHAR_WIDTH : 0;
}
static void
ps_endline(struct termp *p)
{
if (PS_INLINE & p->engine.ps.psstate) {
printf(") show\n");
p->engine.ps.psstate &= ~PS_INLINE;
}
if (PS_MARGINS & p->engine.ps.psstate)
return;
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;
}
/*
* XXX: can't run pageopen() until we're certain a flushln() has
* occured, else the buf will reopen in an awkward state on the
* next line.
*/
printf("showpage\n");
p->engine.ps.psrow = PS_CHAR_TOP;
}
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