Line data    Source code

       1             : /*
       2             :     Mosh: the mobile shell
       3             :     Copyright 2012 Keith Winstein
       4             : 
       5             :     This program is free software: you can redistribute it and/or modify
       6             :     it under the terms of the GNU General Public License as published by
       7             :     the Free Software Foundation, either version 3 of the License, or
       8             :     (at your option) any later version.
       9             : 
      10             :     This program is distributed in the hope that it will be useful,
      11             :     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13             :     GNU General Public License for more details.
      14             : 
      15             :     You should have received a copy of the GNU General Public License
      16             :     along with this program.  If not, see <http://www.gnu.org/licenses/>.
      17             : 
      18             :     In addition, as a special exception, the copyright holders give
      19             :     permission to link the code of portions of this program with the
      20             :     OpenSSL library under certain conditions as described in each
      21             :     individual source file, and distribute linked combinations including
      22             :     the two.
      23             : 
      24             :     You must obey the GNU General Public License in all respects for all
      25             :     of the code used other than OpenSSL. If you modify file(s) with this
      26             :     exception, you may extend this exception to your version of the
      27             :     file(s), but you are not obligated to do so. If you do not wish to do
      28             :     so, delete this exception statement from your version. If you delete
      29             :     this exception statement from all source files in the program, then
      30             :     also delete it here.
      31             : */
      32             : 
      33             : #include <assert.h>
      34             : #include <string.h>
      35             : #include <stdlib.h>
      36             : #include <unistd.h>
      37             : #include <typeinfo>
      38             : 
      39             : #include "terminal.h"
      40             : 
      41             : using namespace Terminal;
      42             : 
      43       11654 : Emulator::Emulator( size_t s_width, size_t s_height )
      44       11654 :   : fb( s_width, s_height ), dispatch(), user()
      45       11654 : {}
      46             : 
      47       28681 : std::string Emulator::read_octets_to_host( void )
      48             : {
      49       28681 :   std::string ret = dispatch.terminal_to_host;
      50       28681 :   dispatch.terminal_to_host.clear();
      51       28681 :   return ret;
      52             : }
      53             : 
      54    47873448 : void Emulator::execute( const Parser::Execute *act )
      55             : {
      56    47873448 :   dispatch.dispatch( CONTROL, act, &fb );
      57    47873448 : }
      58             : 
      59    24028354 : void Emulator::print( const Parser::Print *act )
      60             : {
      61    24028354 :   assert( act->char_present );
      62             : 
      63    24028354 :   const wchar_t ch = act->ch;
      64             : 
      65             :   /*
      66             :    * Check for printing ISO 8859-1 first, it's a cheap way to detect
      67             :    * some common narrow characters.
      68             :    */
      69    24028354 :   const int chwidth = ch == L'\0' ? -1 : ( Cell::isprint_iso8859_1( ch ) ? 1 : wcwidth( ch ));
      70             : 
      71    24028354 :   Cell *this_cell = fb.get_mutable_cell();
      72             : 
      73    24028354 :   switch ( chwidth ) {
      74    24028342 :   case 1: /* normal character */
      75    24028342 :   case 2: /* wide character */
      76    24028342 :     if ( fb.ds.auto_wrap_mode && fb.ds.next_print_will_wrap ) {
      77         292 :       fb.get_mutable_row( -1 )->set_wrap( true );
      78         292 :       fb.ds.move_col( 0 );
      79         292 :       fb.move_rows_autoscroll( 1 );
      80         292 :       this_cell = NULL;
      81    24028050 :     } else if ( fb.ds.auto_wrap_mode
      82    24028050 :                 && (chwidth == 2)
      83    24028050 :                 && (fb.ds.get_cursor_col() == fb.ds.get_width() - 1) ) {
      84             :       /* wrap 2-cell chars if no room, even without will-wrap flag */
      85           0 :       fb.reset_cell( this_cell );
      86           0 :       fb.get_mutable_row( -1 )->set_wrap( false );
      87             :       /* There doesn't seem to be a consistent way to get the
      88             :          downstream terminal emulator to set the wrap-around
      89             :          copy-and-paste flag on a row that ends with an empty cell
      90             :          because a wide char was wrapped to the next line. */
      91           0 :       fb.ds.move_col( 0 );
      92           0 :       fb.move_rows_autoscroll( 1 );
      93           0 :       this_cell = NULL;
      94             :     }
      95             : 
      96    24028342 :     if ( fb.ds.insert_mode ) {
      97           0 :       for ( int i = 0; i < chwidth; i++ ) {
      98           0 :         fb.insert_cell( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() );
      99             :       }
     100             :       this_cell = NULL;
     101             :     }
     102             : 
     103    24028342 :     if (!this_cell) {
     104         292 :       this_cell = fb.get_mutable_cell();
     105             :     }
     106             : 
     107    24028342 :     fb.reset_cell( this_cell );
     108    24028342 :     this_cell->append( ch );
     109    24028342 :     this_cell->set_wide( chwidth == 2 ); /* chwidth had better be 1 or 2 here */
     110    24028342 :     fb.apply_renditions_to_cell( this_cell );
     111             : 
     112    24028342 :     if ( chwidth == 2
     113    24028342 :       && fb.ds.get_cursor_col() + 1 < fb.ds.get_width() ) { /* erase overlapped cell */
     114           0 :       fb.reset_cell( fb.get_mutable_cell( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() + 1 ) );
     115             :     }
     116             : 
     117    24028342 :     fb.ds.move_col( chwidth, true, true );
     118             : 
     119    24028342 :     break;
     120          12 :   case 0: /* combining character */
     121          12 :     {
     122          12 :       Cell *combining_cell = fb.get_combining_cell(); /* can be null if we were resized */
     123          12 :       if ( combining_cell == NULL ) { /* character is now offscreen */
     124             :         break;
     125             :       }
     126             : 
     127          12 :       if ( combining_cell->empty() ) {
     128             :         /* cell starts with combining character */
     129             :         /* ... but isn't necessarily the target for a new
     130             :            base character [e.g. start of line], if the
     131             :            combining character has been cleared with
     132             :            a sequence like ED ("J") or EL ("K") */
     133           4 :         assert( !combining_cell->get_wide() );
     134           4 :         combining_cell->set_fallback( true );
     135           4 :         fb.ds.move_col( 1, true, true );
     136             :       }
     137          12 :       if ( !combining_cell->full() ) {
     138          12 :         combining_cell->append( ch );
     139             :       }
     140             :     }
     141             :     break;
     142             :   case -1: /* unprintable character */
     143             :     break;
     144           0 :   default:
     145           0 :     assert( !"unexpected character width from wcwidth()" );
     146             :     break;
     147             :   }
     148    24028354 : }
     149             : 
     150       30017 : void Emulator::CSI_dispatch( const Parser::CSI_Dispatch *act )
     151             : {
     152       30017 :   dispatch.dispatch( CSI, act, &fb );
     153       30017 : }
     154             : 
     155           0 : void Emulator::OSC_end( const Parser::OSC_End *act )
     156             : {
     157           0 :   dispatch.OSC_dispatch( act, &fb );
     158           0 : }
     159             : 
     160           4 : void Emulator::Esc_dispatch( const Parser::Esc_Dispatch *act )
     161             : {
     162             :   /* handle 7-bit ESC-encoding of C1 control characters */
     163           8 :   if ( (dispatch.get_dispatch_chars().size() == 0)
     164           4 :        && (0x40 <= act->ch)
     165           4 :        && (act->ch <= 0x5F) ) {
     166           0 :     Parser::Esc_Dispatch act2 = *act;
     167           0 :     act2.ch += 0x40;
     168           0 :     dispatch.dispatch( CONTROL, &act2, &fb );
     169           0 :   } else {
     170           4 :     dispatch.dispatch( ESCAPE, act, &fb );
     171             :   }
     172           4 : }
     173             : 
     174         584 : void Emulator::resize( size_t s_width, size_t s_height )
     175             : {
     176         584 :   fb.resize( s_width, s_height );
     177         584 : }
     178             : 
     179       67291 : bool Emulator::operator==( Emulator const &x ) const
     180             : {
     181             :   /* dispatcher and user are irrelevant for us */
     182       67291 :   return fb == x.fb;
     183             : }