Simple actions dispatching on terminal emulator

Makefile

@@ -1,6 +1,6 @@
-source = parse.cpp parserstate.cpp parser.cpp templates.cpp terminal.cpp
-objects = parserstate.o parser.o templates.o terminal.o
-executables = parse
+source = parse.cpp parserstate.cpp parser.cpp templates.cpp terminal.cpp termemu.cpp parseraction.cpp
+objects = parserstate.o parser.o templates.o terminal.o parseraction.o
+executables = parse termemu
 
 CXX = g++
 CXXFLAGS = -g --std=c++0x -pedantic -Werror -Wall -Wextra -Weffc++ -fno-implicit-templates -fno-default-inline -pipe -D_FILE_OFFSET_BITS=64 -D_XOPEN_SOURCE=500 -D_GNU_SOURCE
@@ -11,6 +11,9 @@ all: $(executables)
 parse: parse.o $(objects)
 	$(CXX) $(CXXFLAGS) -o $@ $+ $(LIBS)
 
+termemu: termemu.o $(objects)
+	$(CXX) $(CXXFLAGS) -o $@ $+ $(LIBS)
+
 templates.o: templates.cpp
 	$(CXX) $(CXXFLAGS) -frepo -c -o $@ $<
 

parser.hpp

@@ -23,7 +23,7 @@ namespace Parser {
     Parser() : family(), state( &family.s_Ground ) {}
 
     Parser( const Parser & );
-    bool operator=( const Parser & );
+    Parser & operator=( const Parser & );
     ~Parser() {}
 
     std::vector<Action *> input( wchar_t ch );

parseraction.cpp

@@ -0,0 +1,9 @@
+#include "parseraction.hpp"
+#include "terminal.hpp"
+
+using namespace Parser;
+
+void Print::act_on_terminal( Terminal::Emulator *emu )
+{
+  emu->print( this );
+}

parseraction.hpp

@@ -3,6 +3,10 @@
 
 #include <string>
 
+namespace Terminal {
+  class Emulator;
+}
+
 namespace Parser {
   class Action
   {
@@ -12,6 +16,8 @@ namespace Parser {
 
     virtual std::string name( void ) = 0;
 
+    virtual void act_on_terminal( Terminal::Emulator * ) {};
+
     Action() : char_present( false ), ch( -1 ) {};
     virtual ~Action() {};
   };
@@ -20,7 +26,9 @@ namespace Parser {
   public: std::string name( void ) { return std::string( "Ignore" ); }
   };
   class Print : public Action {
-  public: std::string name( void ) { return std::string( "Print" ); }
+  public:
+    std::string name( void ) { return std::string( "Print" ); }
+    void act_on_terminal( Terminal::Emulator *emu );
   };
   class Execute : public Action {
   public: std::string name( void ) { return std::string( "Execute" ); }

templates.cpp

@@ -1,5 +1,14 @@
 #include <vector>
+#include <wchar.h>
 
-#include "parseraction.hpp"
+#include "terminal.hpp"
+
+namespace Parser {
+  class Action;
+}
 
 template class std::vector<Parser::Action *>;
+template class std::vector<Terminal::Cell>;
+template class std::vector<Terminal::Row>;
+template class std::vector<Terminal::Cell *>;
+template class std::vector<wchar_t>;

termemu.cpp

@@ -0,0 +1,186 @@
+#include <pty.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+#include <poll.h>
+#include <string.h>
+#include <locale.h>
+#include <langinfo.h>
+#include <wchar.h>
+#include <assert.h>
+#include <wctype.h>
+#include <iostream>
+#include <typeinfo>
+
+#include "terminal.hpp"
+
+#ifndef __STDC_ISO_10646__
+#error "Must have __STDC_ISO_10646__"
+#endif
+
+const size_t buf_size = 1024;
+
+void emulate_terminal( int fd );
+int copy( int src, int dest );
+int termemu( int fd, Terminal::Emulator *terminal );
+
+int main( int argc __attribute__((unused)),
+	  char *argv[] __attribute__((unused)),
+	  char *envp[] )
+{
+  int master;
+  struct termios saved_termios, raw_termios, child_termios;
+
+  if ( NULL == setlocale( LC_ALL, "" ) ) {
+    perror( "setlocale" );
+    exit( 1 );
+  }
+
+  if ( strcmp( nl_langinfo( CODESET ), "UTF-8" ) != 0 ) {
+    fprintf( stderr, "rtm requires a UTF-8 locale.\n" );
+    exit( 1 );
+  }
+
+  if ( tcgetattr( STDIN_FILENO, &saved_termios ) < 0 ) {
+    perror( "tcgetattr" );
+    exit( 1 );
+  }
+
+  child_termios = saved_termios;
+
+  if ( !(child_termios.c_iflag & IUTF8) ) {
+    fprintf( stderr, "Warning: Locale is UTF-8 but termios IUTF8 flag not set. Setting IUTF8 flag.\n" );
+    child_termios.c_iflag |= IUTF8;
+  }
+
+  pid_t child = forkpty( &master, NULL, &child_termios, NULL );
+
+  if ( child == -1 ) {
+    perror( "forkpty" );
+    exit( 1 );
+  }
+
+  if ( child == 0 ) {
+    /* child */
+    if ( chdir( "/" ) < 0 ) {
+      perror( "chdir" );
+      exit( 1 );
+    }
+
+    char *my_argv[ 2 ];
+    my_argv[ 0 ] = strdup( "/bin/bash" );
+    assert( my_argv[ 0 ] );
+
+    my_argv[ 1 ] = NULL;
+
+    if ( execve( "/bin/bash", my_argv, envp ) < 0 ) {
+      perror( "execve" );
+      exit( 1 );
+    }
+    exit( 0 );
+  } else {
+    /* parent */
+    raw_termios = saved_termios;
+
+    cfmakeraw( &raw_termios );
+
+    if ( tcsetattr( STDIN_FILENO, TCSANOW, &raw_termios ) < 0 ) {
+      perror( "tcsetattr" );
+      exit( 1 );
+    }
+
+    emulate_terminal( master );
+
+    if ( tcsetattr( STDIN_FILENO, TCSANOW, &saved_termios ) < 0 ) {
+      perror( "tcsetattr" );
+      exit( 1 );
+    }
+  }
+
+  return 0;
+}
+
+void emulate_terminal( int fd )
+{
+  Terminal::Emulator terminal( 80, 24 );
+  struct pollfd pollfds[ 2 ];
+
+  pollfds[ 0 ].fd = STDIN_FILENO;
+  pollfds[ 0 ].events = POLLIN;
+
+  pollfds[ 1 ].fd = fd;
+  pollfds[ 1 ].events = POLLIN;
+
+  while ( 1 ) {
+    int active_fds = poll( pollfds, 2, -1 );
+    if ( active_fds <= 0 ) {
+      perror( "poll" );
+      return;
+    }
+
+    if ( pollfds[ 0 ].revents & POLLIN ) {
+      if ( copy( STDIN_FILENO, fd ) < 0 ) {
+	return;
+      }
+    } else if ( pollfds[ 1 ].revents & POLLIN ) {
+      if ( termemu( fd, &terminal ) < 0 ) {
+	return;
+      }
+    } else if ( (pollfds[ 0 ].revents | pollfds[ 1 ].revents)
+		& (POLLERR | POLLHUP | POLLNVAL) ) {
+      return;
+    } else {
+      fprintf( stderr, "poll mysteriously woken up\n" );
+    }
+  }
+}
+
+int copy( int src, int dest )
+{
+  char buf[ buf_size ];
+
+  ssize_t bytes_read = read( src, buf, buf_size );
+  if ( bytes_read == 0 ) { /* EOF */
+    return -1;
+  } else if ( bytes_read < 0 ) {
+    perror( "read" );
+    return -1;
+  } else {
+    ssize_t total_bytes_written = 0;
+    while ( total_bytes_written < bytes_read ) {
+      ssize_t bytes_written = write( dest, buf + total_bytes_written,
+				     bytes_read - total_bytes_written );
+      if ( bytes_written <= 0 ) {
+	perror( "write" );
+	return -1;
+      } else {
+	total_bytes_written += bytes_written;
+      }
+    }
+  }
+
+  return 0;
+}
+
+int termemu( int fd, Terminal::Emulator *terminal )
+{
+  char buf[ buf_size ];
+
+  /* fill buffer if possible */
+  ssize_t bytes_read = read( fd, buf, buf_size );
+  if ( bytes_read == 0 ) { /* EOF */
+    return -1;
+  } else if ( bytes_read < 0 ) {
+    perror( "read" );
+    return -1;
+  }
+
+  /* feed to terminal */
+  for ( int i = 0; i < bytes_read; i++ ) {
+    terminal->input( buf[ i ] );
+  }
+
+  return 0;
+}

terminal.cpp

@@ -1 +1,63 @@
 #include "terminal.hpp"
+
+using namespace Terminal;
+
+Cell::Cell()
+  : overlapping_cell( NULL ),
+    contents(),
+    overlapped_cells()
+{}
+
+Cell::Cell( const Cell &x )
+  : overlapping_cell( x.overlapping_cell ),
+    contents( x.contents ),
+    overlapped_cells( x.overlapped_cells )
+{}
+
+Cell & Cell::operator=( const Cell &x )
+{
+  overlapping_cell = x.overlapping_cell;
+  contents = x.contents;
+  overlapped_cells = x.overlapped_cells;
+
+  return *this;
+}
+
+Row::Row( size_t s_width )
+  : cells( s_width )
+{}
+
+Emulator::Emulator( size_t s_width, size_t s_height )
+  : parser(),
+    width( s_width ), height( s_height ),
+    cursor_col( 0 ), cursor_row( 0 ),
+    combining_char_col( 0 ), combining_char_row( 0 ),
+    rows( height, Row( width ) )
+{
+
+}
+
+Emulator::~Emulator()
+{
+
+}
+
+void Emulator::input( char c )
+{
+  std::vector<Parser::Action *> vec = parser.input( c );
+
+  for ( std::vector<Parser::Action *>::iterator i = vec.begin();
+	i != vec.end();
+	i++ ) {
+    Parser::Action *act = *i;
+
+    act->act_on_terminal( this );
+
+    delete act;
+  }
+}
+
+void Emulator::print( Parser::Print *act )
+{
+  fprintf( stderr, "print (%lc)!\r\n", act->ch );
+}

terminal.hpp

@@ -5,23 +5,49 @@
 #include "parser.hpp"
 
 namespace Terminal {
-  class Terminal {
+  class Cell {
+  public:
+    Cell *overlapping_cell;
+    std::vector<wchar_t> contents;
+    std::vector<Cell *> overlapped_cells;
+
+    Cell();
+  
+    Cell( const Cell & );
+    Cell & operator=( const Cell & );
+};
+
+  class Row {
+  public:
+    std::vector<Cell> cells;
+
+    Row( size_t s_width );
+  };
+
+  class Emulator {
+    friend void Parser::Print::act_on_terminal( Emulator * );
+
   private:
     Parser::UTF8Parser parser;
 
-    wchar_t *framebuffer;
     size_t width, height;
-
     size_t cursor_col, cursor_row;
+    size_t combining_char_col, combining_char_row;
+
+    std::vector<Row> rows;
+
+    void print( Parser::Print *act );
 
   public:
-    Terminal();
-    ~Terminal();
+    Emulator( size_t s_width, size_t s_height );
+    ~Emulator();
 
+    void input( char c );
 
+    void resize( size_t s_width, size_t s_height );
 
-    Terminal( const Terminal & );
-    Terminal &operator=( const Terminal & );
+    size_t get_width( void ) { return width; }
+    size_t get_height( void ) { return height; }
   };
 }