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/* $Id: mpto.c,v 1.21 2005/08/28 09:17:25 olaf Exp $
 * Public domain.
 *
 * Previous versions of mpto were copyright 1990 - 1995 by AT&T Bell
 * Laboratories.  It has since been put into the public domain.
 *
 * John Hobby wrote the original version, which has since been
 * extensively altered.
 */

/* mpto [-tex|-troff] MPFILE
 * 
 * This program transforms a MetaPost input file into a TeX or troff input
 * file by stripping out btex...etex and verbatimtex...etex sections.
 * Leading and trailing spaces and tabs are removed from the extracted
 * material and it is surrounded by the preceding and following strings
 * defined immediately below.  The input file should be given as argument 1
 * and the resulting TeX or troff file is written on standard output.
 *
 * Changes incorporated from Web2c:
 * - merged TeX and troff mode
 * - support -E<errlog>, for AMIGA
 */

#include <stdio.h>
#include <stdlib.h>

#ifdef WIN32
#include <string.h>
#endif


/* MetaPost itself has a configurable max line length, but we can afford to
   use smaller values than that */
#define bufsize  1000

char*	tex_predoc = "";
char*	tex_postdoc = "\\end{document}\n";
char*	tex_pretex1 = "\\gdef\\mpxshipout{\\shipout\\hbox\\bgroup%\n"
  "  \\setbox0=\\hbox\\bgroup}%\n"
  "\\gdef\\stopmpxshipout{\\egroup"
  "  \\dimen0=\\ht0 \\advance\\dimen0\\dp0\n"
  "  \\dimen1=\\ht0 \\dimen2=\\dp0\n"
  "  \\setbox0=\\hbox\\bgroup\n"
  "    \\box0\n"
  "    \\ifnum\\dimen0>0 \\vrule width1sp height\\dimen1 depth\\dimen2 \n"
  "    \\else \\vrule width1sp height1sp depth0sp\\relax\n"
  "    \\fi\\egroup\n"
  "  \\ht0=0pt \\dp0=0pt \\box0 \\egroup}\n"
  "\\mpxshipout%% line %d %s\n";
char*	tex_pretex = "\\mpxshipout%% line %d %s\n";
char*	tex_posttex = "\\stopmpxshipout\n";
char*	tex_preverb1 = "";			/* if very first instance */
char*	tex_preverb = "%% line %d %s\n";	/* all other instances */
char*	tex_postverb = "%\n";

/* According to CSTR #54 the ".lf" directive should be ".lf %d %s",
 * not ".lf line %d %s" as used in the original code.  This affects
 * troff_pretex1, troff_pretex, troff_preverb1, troff_preverb.
 */
char*	troff_predoc = ".po 0\n";
char*	troff_postdoc = "";
char*	troff_pretex1 = ".lf %d %s\n";	/* first instance */
char*	troff_pretex = ".bp\n.lf %d %s\n";	/* subsequent instances */
char*	troff_posttex = "\n";
char*	troff_preverb1 = ".lf %d %s\n";
char*	troff_preverb = ".lf %d %s\n";
char*	troff_postverb = "\n";

char*	predoc;
char*	postdoc;
char*	pretex1;
char*	pretex;
char*	posttex;
char*	preverb1;
char*	preverb;
char*	postverb;

char *mpname;
FILE *mpfile;
int lnno = 0;		/* current line number */
int texcnt = 0;		/* btex..etex blocks so far */
int verbcnt = 0;	/* verbatimtex..etex blocks so far */
char *bb, *tt, *aa;	/* start of before, token, and after strings */
char buf[bufsize]; /* the input line */

void 
err (char * msg)
{
  fprintf(stderr, "mpto: %s:%d: %s\n",mpname, lnno, msg);
  exit(1);
}

void
usage (char *progn)
{
  fprintf(stderr, "Try `%s --help' for more information\n", progn);
  exit(1);
}

char *
getline(void)	/* returns NULL on EOF or error, otherwise buf */
{
	int c;
	unsigned loc = 0;
	while ((c = getc (mpfile)) != EOF && c != '\n' && c != '\r') {
		buf[loc++] = c;
		if (loc == bufsize)
			err("Line is too long");
	}
	if (c == EOF) return NULL;
	buf[loc] = 0;
	if (c == '\r') {
		c = getc(mpfile);
		if (c != '\n') ungetc(c, mpfile);
	}
	lnno++;
	return buf;
}


/* Return nonzero if a prefix of string s matches the null-terminated string t
 * and the next character is not a letter of an underscore.
 */
int 
match_str (char *s, char *t)
{
	while (*t!=0) {
		if (*s!=*t) return 0;
		s++; t++;
	}
	switch (*s) {
	case 'a': case 'c': case 'd': case 'f': case 'g': case 'h':
	case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
	case 'o': case 'p': case 'q': case 'r': case 's': case 't':
	case 'u': case 'w': case 'x': case 'y': case 'z': case '_':
	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
	case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
	case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
	case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
	case 'Y': case 'Z': case 'b': case 'e': case 'v':
		return 0;
	default:
		return 1;
	}
}


/* This function tries to express s as the concatenation of three strings
 * b, t, a, with the global pointers bb, tt, and aa set to the start of the
 * corresponding strings.  String t is either a quote mark, a percent sign,
 * or an alphabetic token "btex", "etex", or "verbatimtex".  (An alphabetic
 * token is a maximal sequence of letters and underscores.)  If there are
 * several possible substrings t, we choose the leftmost one.  If there is
 * no such t, we set b=s and return 0.
 */
int
getbta (char *s)
{
	int ok=1;	/* zero if last character was a-z, A-Z, or _ */

	bb = s;
	for (tt=bb; *tt!=0; tt++)
		switch (*tt) {
		case '"': case '%':
			aa = tt+1;
			return 1;
		case 'b':
			if (ok && match_str(tt,"btex")) {
				aa = tt+4;
				return 1;
			} else ok=0;
			break;
		case 'e':
			if (ok && match_str(tt,"etex")) {
				aa = tt+4;
				return 1;
			} else ok=0;
			break;
		case 'v':
			if (ok && match_str(tt,"verbatimtex")) {
				aa = tt+11;
				return 1;
			} else ok=0;
			break;
		case 'a': case 'c': case 'd': case 'f': case 'g': case 'h':
		case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
		case 'o': case 'p': case 'q': case 'r': case 's': case 't':
		case 'u': case 'w': case 'x': case 'y': case 'z': case '_':
		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
		case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
		case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
		case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
		case 'Y': case 'Z':
			ok = 0;
			break;
		default:
			ok = 1;
		}
	aa = tt;
	return 0;
}


void
copytex(void)
{
	char *s;	/* where a string to print stops */
	char c;

	while (*aa==' ' || *aa=='\t') aa++;
	if (*aa==0)
		if ((aa=getline())==NULL)
			err("btex section does not end");
	do {	if (*aa==0)
			if ((aa=getline())==NULL)
				err("btex section does not end");
			else printf("\n");
		if (getbta(aa) && *tt=='e') {
			s = tt-1;
			while (s>=bb && (*s==' ' || *s=='\t'))
				s--;
			s++;
		} else {
			if (*tt=='b') err("btex in TeX mode");
			if (*tt=='v') err("verbatimtex in TeX mode");
			s = aa;
		}
		c = *s;
		*s = 0;
		printf("%s", bb);
		*s = c;
	} while (*tt!='e');
}


void
do_line(void)
{
	aa = buf;
	while (getbta(aa))
		if (*tt=='%') break;
		else if (*tt=='"') {
			do if (!getbta(aa)) err("string does not end");
			while (*tt!='"');
		} else if (*tt=='b') {
			if (texcnt++ ==0) printf(pretex1,lnno,mpname);
			else printf(pretex,lnno,mpname);
			copytex();
			printf("%s",posttex);
		} else if (*tt=='v') {
			if (verbcnt++ ==0 && texcnt==0)
				printf(preverb1,lnno,mpname);
			else printf(preverb,lnno,mpname);
			copytex();
			printf("%s",postverb);
		} else err("unmatched etex");
}
  
int
main(int argc, char **argv)
{
    int mode;        
    if (argc == 1) {
	fputs ("mpto: Need exactly one file argument.\n", stderr);
	fputs ("Try `mpto --help' for more information.\n", stderr);
        exit(1);
    } else if (argc > 1 && (strcmp (argv[1], "--help") == 0
                            || strcmp (argv[1], "-help") == 0)) {
	fputs ("Usage: mpto [-tex|-troff] MPFILE",stdout);
#ifdef AMIGA
        fputs (" [-E<errlog-file>]",stdout);
#endif
	fputs ("\n  Strip btex..etex and verbatimtex...etex parts from MetaPost input\n\
  file MPFILE, converting to either TeX or troff (TeX by default).\n\
\n\
--help      display this help and exit\n\
--version   output version information and exit\n",stdout);
        fputs ("\nEmail bug reports to metapost@tug.org.\n", stdout);
        exit (0);
    } else if (argc > 1 && (strcmp (argv[1], "--version") == 0
                            || strcmp (argv[1], "-version") == 0)) {
        printf ("mpto 0.902\n\
This program is in the public domain.\n\
Primary author of mpto: John Hobby.\n");
        exit (0);
    } else if (argc == 2) {
        mpname = argv[1];
        mode = 0;
#ifdef AMIGA
    } else if (argc == 3) {
        if (strcmp (argv[1], "-tex") == 0) {
	    mpname = argv[2];
	    mode = 0;
        } else if (strcmp (argv[1], "-troff") == 0) {
	    mpname = argv[2];
	    mode = 1;
        } else if (strncmp(argv[2], "-E", 2) || (argv[2]+2 == NULL)) {
	    usage(argv[0]);
        } else {
	    mpname = argv[1];
	    freopen(argv[2]+2, "w", stderr);
        }
    } else if (argc == 4) {
        if (strcmp (argv[1], "-tex") == 0) {
	    mode = 0;
        } else if (strcmp (argv[1], "-troff") == 0) {
	    mode = 1;
        } else {
	    usage(argv[0]);
        }
        if (strncmp(argv[3], "-E", 2) || (argv[3]+2 == NULL)) {
	    usage(argv[0]);
        } else {
	    mpname = argv[2];
	    freopen(argv[3]+2, "w", stderr);
        }
#else /* not AMIGA */
    } else if (argc == 3) {
        if (strcmp (argv[1], "-tex") == 0) {
            mode = 0;
        } else if (strcmp (argv[1], "-troff") == 0) {
            mode = 1;
        } else {
            usage (argv[0]);
        }
        mpname = argv[2];
#endif /* not AMIGA */
    } else {
        usage(argv[0]);
    }

    mpfile = fopen(mpname, "r");
    if (mpfile==NULL) {
        fprintf (stderr, "%s: ", argv[0]);
        perror (mpname);
        exit (1);
    }

    /* This is far from elegant, but life is short.  */
    if (mode == 0) {
        predoc = tex_predoc;
        postdoc = tex_postdoc;
        pretex1 = tex_pretex1;
        pretex = tex_pretex;
        posttex = tex_posttex;
        preverb1 = tex_preverb1;
        preverb = tex_preverb;
        postverb = tex_postverb;
    } else {
        predoc = troff_predoc;
        postdoc = troff_postdoc;
        pretex1 = troff_pretex1;
        pretex = troff_pretex;
        posttex = troff_posttex;
        preverb1 = troff_preverb1;
        preverb = troff_preverb;
        postverb = troff_postverb;
    }
    printf("%s",predoc);
    while (getline()!=NULL)
        do_line();
    printf("%s",postdoc);
    exit(0);
}