
/******************************************************************************
* MODULE     : input.cpp
* DESCRIPTION: Generic TeXmacs input
* COPYRIGHT  : (C) 2000  Joris van der Hoeven
*******************************************************************************
* This software falls under the GNU general public license and comes WITHOUT
* ANY WARRANTY WHATSOEVER. See the file $TEXMACS_PATH/LICENSE for more details.
* If you don't have this file, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
******************************************************************************/

#include "path.hpp"
#include "convert.hpp"
#include "hashmap.hpp"
#include "tm_link.hpp"
#include "Generic/input.hpp"
#include "scheme.hpp"

#define STATUS_NORMAL 0
#define STATUS_ESCAPE 1
#define STATUS_BEGIN  2

#define MODE_VERBATIM 0
#define MODE_SCHEME   1
#define MODE_LATEX    2
#define MODE_HTML     3
#define MODE_PS       4
#define MODE_CHANNEL  5
#define MODE_COMMAND  6
#define MODE_XFORMAT  7

/******************************************************************************
* Universal data input
******************************************************************************/

texmacs_input_rep::texmacs_input_rep (string type2):
  type (type2),
  status (STATUS_NORMAL),
  buf (""),
  format ("verbatim"),
  mode (get_mode (format)),
  channel (type),
  stack (""),
  docs (tree (DOCUMENT, "")) { bof (); }

texmacs_input::texmacs_input (string type):
  rep (new texmacs_input_rep (type)) {}

/******************************************************************************
* Mode and channel handling
******************************************************************************/

int
texmacs_input_rep::get_mode (string s) {
  if (s == "verbatim")  return MODE_VERBATIM;
  if (s == "latex") return MODE_LATEX;
  if (s == "scheme") return MODE_SCHEME;
  if (s == "html")  return MODE_HTML;
  if (s == "ps")  return MODE_PS;
  if (s == "channel")  return MODE_CHANNEL;
  if (s == "command")  return MODE_COMMAND;
  if (as_bool (call ("format?", s))) return MODE_XFORMAT;
  return MODE_VERBATIM;
}

void
texmacs_input_rep::begin_mode (string s) {
  stack = tuple (format, channel, stack);
  format= s;
  mode  = get_mode (format);
}

void
texmacs_input_rep::begin_channel (string s) {
  stack  = tuple (format, channel, stack);
  channel= s;
  if ((channel == "prompt") || (channel == "input"))
    docs (channel)= tree (DOCUMENT, "");
}

void
texmacs_input_rep::end () {
  if (stack != "") {
    format = stack[0]->label;
    mode   = get_mode (format);
    channel= stack[1]->label;
    stack  = stack[2];
  }
}

/******************************************************************************
* Main routines
******************************************************************************/

bool
texmacs_input_rep::put (char c) { // returns true when expecting input
  /*
  if (c == DATA_BEGIN) cout << "[BEGIN]";
  else if (c == DATA_END) cout << "[END]";
  else if (c == DATA_ESCAPE) cout << "[ESCAPE]";
  else cout << c;
  */

  bool block_done= false;
  switch (status) {
  case STATUS_NORMAL:
    if (c == DATA_ESCAPE) status= STATUS_ESCAPE;
    else if (c == DATA_BEGIN) {
      flush (true);
      status= STATUS_BEGIN;
    }
    else if (c == DATA_END) {
      flush (true);
      end ();
      block_done= (stack == "");
    }
    else buf << c;
    break;
  case STATUS_ESCAPE:
    buf << c;
    status= STATUS_NORMAL;
    break;
  case STATUS_BEGIN:
    if (c == ':') {
      begin_mode (buf);
      buf   = "";
      status= STATUS_NORMAL;
    }
    else if (c == '#') {
      begin_channel (buf);
      buf   = "";
      status= STATUS_NORMAL;
    }
    else buf << c;
    break;
  }
  if (status == STATUS_NORMAL) flush ();
  return block_done;
}

void
texmacs_input_rep::bof () {
  format = "verbatim";
  channel= type;
  docs (channel)= tree (DOCUMENT, "");
}

void
texmacs_input_rep::eof () {
  flush (true);
}

void
texmacs_input_rep::write (tree u) {
  if (!docs->contains (channel))
    docs (channel)= tree (DOCUMENT, "");
  tree& t= docs (channel);
  if (!is_document (u)) u= tree (DOCUMENT, u);
  if (t[N(t)-1] == "") t[N(t)-1]= u[0];
  else {
    if (!is_concat (t[N(t)-1])) t[N(t)-1]= tree (CONCAT, t[N(t)-1]);
    if (!is_concat (u[0])) u[0]= tree (CONCAT, u[0]);
    t[N(t)-1] << A(u[0]);
  }
  if (N(u)>1) t << A (u (1, N(u)));
}

tree
texmacs_input_rep::get (string ch) {
  if (!docs->contains (channel))
    docs (channel)= tree (DOCUMENT, "");
  tree& doc= docs (ch);
  if (doc == tree (DOCUMENT, "")) return "";
  tree t= doc;
  doc= tree (DOCUMENT, "");
  return t;
}

/******************************************************************************
* Flushing
******************************************************************************/

void
texmacs_input_rep::flush (bool force) {
  if ((!force) && (channel == "error") && (stack != "")) return;
  switch (mode) {
  case MODE_VERBATIM:
    verbatim_flush (force);
    break;
  case MODE_SCHEME:
    scheme_flush (force);
    break;
  case MODE_LATEX:
    latex_flush (force);
    break;
  case MODE_HTML:
    html_flush (force);
    break;
  case MODE_PS:
    ps_flush (force);
    break;
  case MODE_CHANNEL:
    channel_flush (force);
    break;
  case MODE_COMMAND:
    command_flush (force);
    break;
  case MODE_XFORMAT:
    xformat_flush (force);
    break;
  default:
    fatal_error ("invalid mode", "texmacs_input_rep::flush", "input.cpp");
    break;
  }
}

void
texmacs_input_rep::verbatim_flush (bool force) {
  if (force || ends (buf, "\n")) {
    write (verbatim_to_tree (buf));
    buf= "";
  }
}

void
texmacs_input_rep::scheme_flush (bool force) {
  if (force) {
    write (scheme_to_tree (buf));
    buf= "";
  }
}

void
texmacs_input_rep::latex_flush (bool force) {
  if (force || ends (buf, "\n\n")) {
    write (generic_to_tree (buf, "latex-snippet"));
    buf= "";
  }
}

void
texmacs_input_rep::html_flush (bool force) {
  if (force || ends (buf, "</P>")) {
    write (generic_to_tree (buf, "html-snippet"));
    buf= "";
  }
}

void
texmacs_input_rep::ps_flush (bool force) {
  if (force) {
    tree t (POSTSCRIPT, tuple (tree (RAW_DATA, copy (buf)), "ps"));
    t << "" << "" << "" << "" << "" << "";
    write (t);
    buf= "";
  }
}

void
texmacs_input_rep::channel_flush (bool force) {
  if (force) {
    if ((buf == "prompt") || (buf == "input"))
      docs (buf)= tree (DOCUMENT, "");
    stack[1]= buf;
    buf= "";
  }
}

void
texmacs_input_rep::command_flush (bool force) {
  if (force) {
    eval ("(begin " * buf * ")");
    buf= "";
  }
}

void
texmacs_input_rep::xformat_flush (bool force) {
  if (force) {
    write (generic_to_tree (buf, format * "-snippet"));
    buf= "";
  }
}
