Support some executes (LF, CR, BS+rubout)

parse.cpp

@@ -188,7 +188,11 @@ int vt_parser( int fd, Parser::UTF8Parser *parser )
       assert( act );
 
       if ( act->char_present ) {
+	if ( isprint( act->ch ) ) {
 	  printf( "%s(0x%02x=%lc) ", act->name().c_str(), act->ch, act->ch );
+	} else {
+	  printf( "%s(0x%02x) ", act->name().c_str(), act->ch );
+	}
       } else {
 	printf( "[%s] ", act->name().c_str() );
       }

parseraction.cpp

@@ -7,3 +7,8 @@ void Print::act_on_terminal( Terminal::Emulator *emu )
 {
   emu->print( this );
 }
+
+void Execute::act_on_terminal( Terminal::Emulator *emu )
+{
+  emu->execute( this );
+}

parseraction.hpp

@@ -32,6 +32,7 @@ namespace Parser {
   };
   class Execute : public Action {
   public: std::string name( void ) { return std::string( "Execute" ); }
+    void act_on_terminal( Terminal::Emulator *emu );
   };
   class Clear : public Action {
   public: std::string name( void ) { return std::string( "Clear" ); }

terminal.cpp

@@ -68,6 +68,7 @@ void Emulator::scroll( int N )
       rows.pop_front();
       rows.push_back( Row( width ) );
       cursor_row--;
+      combining_char_row--;
     }
   }
 }
@@ -78,6 +79,36 @@ void Emulator::newgrapheme( void )
   combining_char_row = cursor_row;  
 }
 
+void Emulator::autoscroll( void )
+{
+  if ( cursor_row >= height ) { /* scroll */
+    scroll( cursor_row - height + 1 );
+  }
+}
+
+void Emulator::execute( Parser::Execute *act )
+{
+  assert( act->char_present );
+
+  switch ( act->ch ) {
+  case 0x0a: /* LF */
+    cursor_row++;
+    autoscroll();
+    break;
+
+  case 0x0d: /* CR */
+    cursor_col = 0;
+    break;
+    
+  case 0x08: /* BS */
+    if ( cursor_col > 0 ) {
+      cursor_col--;
+      rows[ cursor_row ].cells[ cursor_col ].contents.clear();
+    }
+    break;
+  }
+}
+
 void Emulator::print( Parser::Print *act )
 {
   assert( act->char_present );
@@ -99,14 +130,15 @@ void Emulator::print( Parser::Print *act )
       cursor_row++;
     }
 
-    if ( cursor_row >= height ) { /* scroll */
+    autoscroll();
-      scroll( cursor_row - height + 1 );
-    }
 
     rows[ cursor_row ].cells[ cursor_col ].contents.clear();
     rows[ cursor_row ].cells[ cursor_col ].contents.push_back( act->ch );
     newgrapheme();
     cursor_col++;
+    break;
+  default:
+    break;
   }
 }
 
@@ -126,5 +158,7 @@ void Emulator::debug_printout( FILE *f )
     }
   }
 
+  fprintf( f, "\033[%d;%dH", cursor_row + 1, cursor_col + 1 );
+
   fflush( NULL );
 }

terminal.hpp

@@ -30,6 +30,7 @@ namespace Terminal {
 
   class Emulator {
     friend void Parser::Print::act_on_terminal( Emulator * );
+    friend void Parser::Execute::act_on_terminal( Emulator * );
 
   private:
     Parser::UTF8Parser parser;
@@ -41,8 +42,10 @@ namespace Terminal {
     std::deque<Row> rows;
 
     void print( Parser::Print *act );
+    void execute( Parser::Execute *act );
 
     void scroll( int N );
+    void autoscroll( void );
 
     void newgrapheme( void );