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/* chew

   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2001,

   2002, 2003, 2005, 2007

   Free Software Foundation, Inc.

   Contributed by steve chamberlain @cygnus

   This file is part of BFD, the Binary File Descriptor library.

   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 3 of the License, 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., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* Yet another way of extracting documentation from source.

   No, I haven't finished it yet, but I hope you people like it better

   than the old way

   sac

   Basically, this is a sort of string forth, maybe we should call it

   struth?

   You define new words thus:

   : <newword> <oldwords> ;

*/

/* Primitives provided by the program:

   Two stacks are provided, a string stack and an integer stack.

   Internal state variables:

        internal_wanted - indicates whether `-i' was passed

        internal_mode - user-settable

   Commands:

        push_text

        ! - pop top of integer stack for address, pop next for value; store

        @ - treat value on integer stack as the address of an integer; push

                that integer on the integer stack after popping the "address"

        hello - print "hello\n" to stdout

        stdout - put stdout marker on TOS

        stderr - put stderr marker on TOS

        print - print TOS-1 on TOS (eg: "hello\n" stdout print)

        skip_past_newline

        catstr - fn icatstr

        copy_past_newline - append input, up to and including newline into TOS

        dup - fn other_dup

        drop - discard TOS

        idrop - ditto

        remchar - delete last character from TOS

        get_stuff_in_command

        do_fancy_stuff - translate <<foo>> to @code{foo} in TOS

        bulletize - if "o" lines found, prepend @itemize @bullet to TOS

                and @item to each "o" line; append @end itemize

        courierize - put @example around . and | lines, translate {* *} { }

        exit - fn chew_exit

        swap

        outputdots - strip out lines without leading dots

        paramstuff - convert full declaration into "PARAMS" form if not already

        maybecatstr - do catstr if internal_mode == internal_wanted, discard

                value in any case

        translatecomments - turn {* and *} into comment delimiters

        kill_bogus_lines - get rid of extra newlines

        indent

        internalmode - pop from integer stack, set `internalmode' to that value

        print_stack_level - print current stack depth to stderr

        strip_trailing_newlines - go ahead, guess...

        [quoted string] - push string onto string stack

        [word starting with digit] - push atol(str) onto integer stack

   A command must be all upper-case, and alone on a line.

   Foo.  */

#include "ansidecl.h"

#include <assert.h>

#include <stdio.h>

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#define DEF_SIZE 5000

#define STACK 50

int internal_wanted;

int internal_mode;

int warning;

/* Here is a string type ...  */

typedef struct buffer

{

  char *ptr;

  unsigned long write_idx;

  unsigned long size;

} string_type;

#ifdef __STDC__

static void init_string_with_size (string_type *, unsigned int);

static void init_string (string_type *);

static int find (string_type *, char *);

static void write_buffer (string_type *, FILE *);

static void delete_string (string_type *);

static char *addr (string_type *, unsigned int);

static char at (string_type *, unsigned int);

static void catchar (string_type *, int);

static void overwrite_string (string_type *, string_type *);

static void catbuf (string_type *, char *, unsigned int);

static void cattext (string_type *, char *);

static void catstr (string_type *, string_type *);

static void die (char *);

#endif

static void

init_string_with_size (buffer, size)

     string_type *buffer;

     unsigned int size;

{

  buffer->write_idx = 0;

  buffer->size = size;

  buffer->ptr = malloc (size);

}

static void

init_string (buffer)

     string_type *buffer;

{

  init_string_with_size (buffer, DEF_SIZE);

}

static int

find (str, what)

     string_type *str;

     char *what;

{

  unsigned int i;

  char *p;

  p = what;

  for (i = 0; i < str->write_idx && *p; i++)

    {

      if (*p == str->ptr[i])

        p++;

      else

        p = what;

    }

  return (*p == 0);

}

static void

write_buffer (buffer, f)

     string_type *buffer;

     FILE *f;

{

  if (buffer->write_idx != 0

      && fwrite (buffer->ptr, buffer->write_idx, 1, f) != 1)

    die ("cannot write output");

}

static void

delete_string (buffer)

     string_type *buffer;

{

  free (buffer->ptr);

}

static char *

addr (buffer, idx)

     string_type *buffer;

     unsigned int idx;

{

  return buffer->ptr + idx;

}

static char

at (buffer, pos)

     string_type *buffer;

     unsigned int pos;

{

  if (pos >= buffer->write_idx)

    return 0;

  return buffer->ptr[pos];

}

static void

catchar (buffer, ch)

     string_type *buffer;

     int ch;

{

  if (buffer->write_idx == buffer->size)

    {

      buffer->size *= 2;

      buffer->ptr = realloc (buffer->ptr, buffer->size);

    }

  buffer->ptr[buffer->write_idx++] = ch;

}

static void

overwrite_string (dst, src)

     string_type *dst;

     string_type *src;

{

  free (dst->ptr);

  dst->size = src->size;

  dst->write_idx = src->write_idx;

  dst->ptr = src->ptr;

}

static void

catbuf (buffer, buf, len)

     string_type *buffer;

     char *buf;

     unsigned int len;

{

  if (buffer->write_idx + len >= buffer->size)

    {

      while (buffer->write_idx + len >= buffer->size)

        buffer->size *= 2;

      buffer->ptr = realloc (buffer->ptr, buffer->size);

    }

  memcpy (buffer->ptr + buffer->write_idx, buf, len);

  buffer->write_idx += len;

}

static void

cattext (buffer, string)

     string_type *buffer;

     char *string;

{

  catbuf (buffer, string, (unsigned int) strlen (string));

}

static void

catstr (dst, src)

     string_type *dst;

     string_type *src;

{

  catbuf (dst, src->ptr, src->write_idx);

}

static unsigned int

skip_white_and_stars (src, idx)

     string_type *src;

     unsigned int idx;

{

  char c;

  while ((c = at (src, idx)),

         isspace ((unsigned char) c)

         || (c == '*'

             /* Don't skip past end-of-comment or star as first

                character on its line.  */

             && at (src, idx +1) != '/'

             && at (src, idx -1) != '\n'))

    idx++;

  return idx;

}

/***********************************************************************/

string_type stack[STACK];

string_type *tos;

unsigned int idx = 0; /* Pos in input buffer */

string_type *ptr; /* and the buffer */

typedef void (*stinst_type)();

stinst_type *pc;

stinst_type sstack[STACK];

stinst_type *ssp = &sstack[0];

long istack[STACK];

long *isp = &istack[0];

typedef int *word_type;

struct dict_struct

{

  char *word;

  struct dict_struct *next;

  stinst_type *code;

  int code_length;

  int code_end;

  int var;

};

typedef struct dict_struct dict_type;

static void

die (msg)

     char *msg;

{

  fprintf (stderr, "%s\n", msg);

  exit (1);

}

static void

check_range ()

{

  if (tos < stack)

    die ("underflow in string stack");

  if (tos >= stack + STACK)

    die ("overflow in string stack");

}

static void

icheck_range ()

{

  if (isp < istack)

    die ("underflow in integer stack");

  if (isp >= istack + STACK)

    die ("overflow in integer stack");

}

#ifdef __STDC__

static void exec (dict_type *);

static void call (void);

static void remchar (void), strip_trailing_newlines (void), push_number (void);

static void push_text (void);

static void remove_noncomments (string_type *, string_type *);

static void print_stack_level (void);

static void paramstuff (void), translatecomments (void);

static void outputdots (void), courierize (void), bulletize (void);

static void do_fancy_stuff (void);

static int iscommand (string_type *, unsigned int);

static int copy_past_newline (string_type *, unsigned int, string_type *);

static void icopy_past_newline (void), kill_bogus_lines (void), indent (void);

static void get_stuff_in_command (void), swap (void), other_dup (void);

static void drop (void), idrop (void);

static void icatstr (void), skip_past_newline (void), internalmode (void);

static void maybecatstr (void);

static char *nextword (char *, char **);

dict_type *lookup_word (char *);

static void perform (void);

dict_type *newentry (char *);

unsigned int add_to_definition (dict_type *, stinst_type);

void add_intrinsic (char *, void (*)());

void add_var (char *);

void compile (char *);

static void bang (void);

static void atsign (void);

static void hello (void);

static void stdout_ (void);

static void stderr_ (void);

static void print (void);

static void read_in (string_type *, FILE *);

static void usage (void);

static void chew_exit (void);

#endif

static void

exec (word)

     dict_type *word;

{

  pc = word->code;

  while (*pc)

    (*pc) ();

}

static void

call ()

{

  stinst_type *oldpc = pc;

  dict_type *e;

  e = (dict_type *) (pc[1]);

  exec (e);

  pc = oldpc + 2;

}

static void

remchar ()

{

  if (tos->write_idx)

    tos->write_idx--;

  pc++;

}

static void

strip_trailing_newlines ()

{

  while ((isspace ((unsigned char) at (tos, tos->write_idx - 1))

          || at (tos, tos->write_idx - 1) == '\n')

         && tos->write_idx > 0)

    tos->write_idx--;

  pc++;

}

static void

push_number ()

{

  isp++;

  icheck_range ();

  pc++;

  *isp = (long) (*pc);

  pc++;

}

static void

push_text ()

{

  tos++;

  check_range ();

  init_string (tos);

  pc++;

  cattext (tos, *((char **) pc));

  pc++;

}

/* This function removes everything not inside comments starting on

   the first char of the line from the  string, also when copying

   comments, removes blank space and leading *'s.

   Blank lines are turned into one blank line.  */

static void

remove_noncomments (src, dst)

     string_type *src;

     string_type *dst;

{

  unsigned int idx = 0;

  while (at (src, idx))

    {

      /* Now see if we have a comment at the start of the line.  */

      if (at (src, idx) == '\n'

          && at (src, idx + 1) == '/'

          && at (src, idx + 2) == '*')

        {

          idx += 3;

          idx = skip_white_and_stars (src, idx);

          /* Remove leading dot */

          if (at (src, idx) == '.')

            idx++;

          /* Copy to the end of the line, or till the end of the

             comment.  */

          while (at (src, idx))

            {

              if (at (src, idx) == '\n')

                {

                  /* end of line, echo and scrape of leading blanks  */

                  if (at (src, idx + 1) == '\n')

                    catchar (dst, '\n');

                  catchar (dst, '\n');

                  idx++;

                  idx = skip_white_and_stars (src, idx);

                }

              else if (at (src, idx) == '*' && at (src, idx + 1) == '/')

                {

                  idx += 2;

                  cattext (dst, "\nENDDD\n");

                  break;

                }

              else

                {

                  catchar (dst, at (src, idx));

                  idx++;

                }

            }

        }

      else

        idx++;

    }

}

static void

print_stack_level ()

{

  fprintf (stderr, "current string stack depth = %d, ", tos - stack);

  fprintf (stderr, "current integer stack depth = %d\n", isp - istack);

  pc++;

}

/* turn:

     foobar name(stuff);

   into:

     foobar

     name PARAMS ((stuff));

   and a blank line.

 */

static void

paramstuff ()

{

  unsigned int openp;

  unsigned int fname;

  unsigned int idx;

  unsigned int len;

  string_type out;

  init_string (&out);

#define NO_PARAMS 1

  /* Make sure that it's not already param'd or proto'd.  */

  if (NO_PARAMS

      || find (tos, "PARAMS") || find (tos, "PROTO") || !find (tos, "("))

    {

      catstr (&out, tos);

    }

  else

    {

      /* Find the open paren.  */

      for (openp = 0; at (tos, openp) != '(' && at (tos, openp); openp++)

        ;

      fname = openp;

      /* Step back to the fname.  */

      fname--;

      while (fname && isspace ((unsigned char) at (tos, fname)))

        fname--;

      while (fname

             && !isspace ((unsigned char) at (tos,fname))

             && at (tos,fname) != '*')

        fname--;

      fname++;

      /* Output type, omitting trailing whitespace character(s), if

         any.  */

      for (len = fname; 0 < len; len--)

        {

          if (!isspace ((unsigned char) at (tos, len - 1)))

            break;

        }

      for (idx = 0; idx < len; idx++)

        catchar (&out, at (tos, idx));

      cattext (&out, "\n");     /* Insert a newline between type and fnname */

      /* Output function name, omitting trailing whitespace

         character(s), if any.  */

      for (len = openp; 0 < len; len--)

        {

          if (!isspace ((unsigned char) at (tos, len - 1)))

            break;

        }

      for (idx = fname; idx < len; idx++)

        catchar (&out, at (tos, idx));

      cattext (&out, " PARAMS (");

      for (idx = openp; at (tos, idx) && at (tos, idx) != ';'; idx++)

        catchar (&out, at (tos, idx));

      cattext (&out, ");\n\n");

    }

  overwrite_string (tos, &out);

  pc++;

}

/* turn {*

   and *} into comments */

static void

translatecomments ()

{

  unsigned int idx = 0;

  string_type out;

  init_string (&out);

  while (at (tos, idx))

    {

      if (at (tos, idx) == '{' && at (tos, idx + 1) == '*')

        {

          cattext (&out, "/*");

          idx += 2;

        }

      else if (at (tos, idx) == '*' && at (tos, idx + 1) == '}')

        {

          cattext (&out, "*/");

          idx += 2;

        }

      else

        {

          catchar (&out, at (tos, idx));

          idx++;

        }

    }

  overwrite_string (tos, &out);

  pc++;

}

/* Mod tos so that only lines with leading dots remain */

static void

outputdots ()

{

  unsigned int idx = 0;

  string_type out;

  init_string (&out);

  while (at (tos, idx))

    {

      if (at (tos, idx) == '\n' && at (tos, idx + 1) == '.')

        {

          char c;

          idx += 2;

          while ((c = at (tos, idx)) && c != '\n')

            {

              if (c == '{' && at (tos, idx + 1) == '*')

                {

                  cattext (&out, "/*");

                  idx += 2;

                }

              else if (c == '*' && at (tos, idx + 1) == '}')

                {

                  cattext (&out, "*/");

                  idx += 2;

                }

              else

                {

                  catchar (&out, c);

                  idx++;

                }

            }

          catchar (&out, '\n');

        }

      else

        {

          idx++;

        }

    }

  overwrite_string (tos, &out);

  pc++;

}

/* Find lines starting with . and | and put example around them on tos */

static void

courierize ()

{

  string_type out;

  unsigned int idx = 0;

  int command = 0;

  init_string (&out);

  while (at (tos, idx))

    {

      if (at (tos, idx) == '\n'

          && (at (tos, idx +1 ) == '.'

              || at (tos, idx + 1) == '|'))

        {

          cattext (&out, "\n@example\n");

          do

            {

              idx += 2;

              while (at (tos, idx) && at (tos, idx) != '\n')

                {

                  if (command > 1)

                    {

                      /* We are inside {} parameters of some command;

                         Just pass through until matching brace.  */

                      if (at (tos, idx) == '{')

                        ++command;

                      else if (at (tos, idx) == '}')

                        --command;