Keith Winstein
375 lines
8.0 KiB
C++
375 lines
8.0 KiB
C++
#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <typeinfo>
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#include "terminal.hpp"
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using namespace Terminal;
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static void swrite( int fd, const char *str );
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Cell::Cell()
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: overlapping_cell( NULL ),
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contents(),
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overlapped_cells()
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{}
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Cell::Cell( const Cell &x )
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: overlapping_cell( x.overlapping_cell ),
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contents( x.contents ),
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overlapped_cells( x.overlapped_cells )
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{}
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Cell & Cell::operator=( const Cell &x )
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{
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overlapping_cell = x.overlapping_cell;
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contents = x.contents;
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overlapped_cells = x.overlapped_cells;
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return *this;
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}
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Row::Row( size_t s_width )
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: cells( s_width )
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{}
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Emulator::Emulator( size_t s_width, size_t s_height )
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: parser(),
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width( s_width ), height( s_height ),
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cursor_col( 0 ), cursor_row( 0 ),
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combining_char_col( 0 ), combining_char_row( 0 ),
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rows( height, Row( width ) ),
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params(), dispatch_chars(), terminal_to_host(),
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errors(), parsed_params()
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{
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}
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Emulator::~Emulator()
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{
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}
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std::string Emulator::input( char c, int actfd )
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{
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terminal_to_host.clear();
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std::vector<Parser::Action *> vec = parser.input( c );
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for ( std::vector<Parser::Action *>::iterator i = vec.begin();
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i != vec.end();
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i++ ) {
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Parser::Action *act = *i;
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act->act_on_terminal( this );
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if ( (actfd > 0) && ( !act->handled ) ) {
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char actsum[ 32 ];
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wchar_t ch = L'\0';
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if ( act->char_present ) {
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ch = act->ch;
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}
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snprintf( actsum, 32, "%s[%s](%s){%lc} ",
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act->name().c_str(),
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dispatch_chars.c_str(),
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params.c_str(),
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ch );
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swrite( actfd, actsum );
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}
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delete act;
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}
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return terminal_to_host;
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}
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void Emulator::scroll( int N )
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{
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if ( N == 0 ) {
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return;
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} else if ( N > 0 ) {
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for ( int i = 0; i < N; i++ ) {
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rows.pop_front();
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rows.push_back( Row( width ) );
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cursor_row--;
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combining_char_row--;
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}
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}
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}
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void Emulator::newgrapheme( void )
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{
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combining_char_col = cursor_col;
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combining_char_row = cursor_row;
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}
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void Emulator::autoscroll( void )
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{
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if ( cursor_row >= height ) { /* scroll */
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scroll( cursor_row - height + 1 );
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}
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}
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void Emulator::execute( Parser::Execute *act )
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{
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assert( act->char_present );
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switch ( act->ch ) {
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case 0x0a: /* LF */
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cursor_row++;
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autoscroll();
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act->handled = true;
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break;
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case 0x0d: /* CR */
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cursor_col = 0;
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act->handled = true;
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break;
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case 0x08: /* BS */
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if ( cursor_col > 0 ) {
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cursor_col--;
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newgrapheme(); /* this is not xterm's behavior */
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act->handled = true;
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}
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break;
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}
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}
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void Emulator::print( Parser::Print *act )
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{
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assert( act->char_present );
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if ( (width == 0) || (height == 0) ) {
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return;
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}
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assert( cursor_row < height ); /* must be on screen */
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assert( cursor_row <= width ); /* one off is ok */
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int chwidth = act->ch == L'\0' ? -1 : wcwidth( act->ch );
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Cell *this_cell;
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switch ( chwidth ) {
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case 1: /* normal character */
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case 2: /* wide character */
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if ( cursor_col >= width ) { /* wrap */
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cursor_col = 0;
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cursor_row++;
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}
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autoscroll();
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this_cell = &rows[ cursor_row ].cells[ cursor_col ];
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this_cell->reset();
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this_cell->contents.push_back( act->ch );
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newgrapheme();
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if ( (cursor_col < width - 1) && (chwidth == 2) ) {
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Cell *next_cell = &rows[ cursor_row ].cells[ cursor_col + 1 ];
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this_cell->overlapped_cells.push_back( next_cell );
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next_cell->overlapping_cell = this_cell;
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}
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cursor_col += chwidth;
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act->handled = true;
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break;
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case 0: /* combining character */
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if ( rows[ combining_char_row ].cells[ combining_char_col ].contents.size() < 16 ) { /* seems like a reasonable limit on combining character */
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rows[ combining_char_row ].cells[ combining_char_col ].contents.push_back( act->ch );
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}
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act->handled = true;
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break;
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case -1: /* unprintable character */
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break;
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default:
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assert( false );
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}
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}
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static void swrite( int fd, const char *str )
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{
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ssize_t total_bytes_written = 0;
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ssize_t bytes_to_write = strlen( str );
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while ( total_bytes_written < bytes_to_write ) {
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ssize_t bytes_written = write( fd, str + total_bytes_written,
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bytes_to_write - total_bytes_written );
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if ( bytes_written <= 0 ) {
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perror( "write" );
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} else {
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total_bytes_written += bytes_written;
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}
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}
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}
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void Emulator::debug_printout( int fd )
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{
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std::string screen;
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screen.append( "\033[H\033[2J" );
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for ( int y = 0; y < height; y++ ) {
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for ( int x = 0; x < width; x++ ) {
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char curmove[ 32 ];
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snprintf( curmove, 32, "\033[%d;%dH", y + 1, x + 1 );
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screen.append( curmove );
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Cell *cell = &rows[ y ].cells[ x ];
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if ( cell->overlapping_cell ) continue;
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for ( std::vector<wchar_t>::iterator i = cell->contents.begin();
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i != cell->contents.end();
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i++ ) {
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char utf8[ 8 ];
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snprintf( utf8, 8, "%lc", *i );
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screen.append( utf8 );
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}
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}
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}
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char curmove[ 32 ];
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snprintf( curmove, 32, "\033[%d;%dH", cursor_row + 1, cursor_col + 1 );
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screen.append( curmove );
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swrite( fd, screen.c_str() );
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}
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void Emulator::param( Parser::Param *act )
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{
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assert( act->char_present );
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assert( (act->ch == ';') || ( (act->ch >= '0') && (act->ch <= '9') ) );
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if ( params.length() < 100 ) {
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/* enough for 16 five-char params plus 15 semicolons */
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params.push_back( act->ch );
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act->handled = true;
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}
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}
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void Emulator::collect( Parser::Collect *act )
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{
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assert( act->char_present );
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if ( ( dispatch_chars.length() < 8 ) /* never should need more than 2 */
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&& ( act->ch <= 255 ) ) { /* ignore non-8-bit */
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dispatch_chars.push_back( act->ch );
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act->handled = true;
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}
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}
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void Emulator::clear( Parser::Clear *act )
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{
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params.clear();
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dispatch_chars.clear();
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act->handled = true;
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}
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void Emulator::CSI_dispatch( Parser::CSI_Dispatch *act )
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{
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/* add final char to dispatch key */
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assert( act->char_present );
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Parser::Collect act2;
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act2.char_present = true;
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act2.ch = act->ch;
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collect( &act2 );
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if ( dispatch_chars == "K" ) {
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CSI_EL();
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act->handled = true;
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} else if ( dispatch_chars == "J" ) {
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CSI_ED();
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act->handled = true;
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} else if ( (dispatch_chars == "A")
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|| (dispatch_chars == "B")
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|| (dispatch_chars == "C")
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|| (dispatch_chars == "D")
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|| (dispatch_chars == "H")
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|| (dispatch_chars == "f") ) {
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CSI_cursormove();
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act->handled = true;
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} else if ( dispatch_chars == "c" ) {
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CSI_DA();
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act->handled = true;
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}
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}
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void Emulator::Esc_dispatch( Parser::Esc_Dispatch *act )
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{
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/* add final char to dispatch key */
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assert( act->char_present );
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Parser::Collect act2;
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act2.char_present = true;
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act2.ch = act->ch;
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collect( &act2 );
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if ( dispatch_chars == "#8" ) {
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Esc_DECALN();
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act->handled = true;
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}
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}
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void Emulator::parse_params( void )
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{
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parsed_params.clear();
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const char *str = params.c_str();
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const char *segment_begin = str;
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while ( 1 ) {
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const char *segment_end = strchr( segment_begin, ';' );
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if ( segment_end == NULL ) {
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break;
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}
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errno = 0;
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char *endptr;
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int val = strtol( segment_begin, &endptr, 10 );
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if ( endptr == segment_begin ) {
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val = -1;
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}
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if ( errno == 0 ) {
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parsed_params.push_back( val );
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}
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segment_begin = segment_end + 1;
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}
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/* get last param */
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errno = 0;
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char *endptr;
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int val = strtol( segment_begin, &endptr, 10 );
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if ( endptr == segment_begin ) {
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val = -1;
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}
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if ( errno == 0 ) {
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parsed_params.push_back( val );
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}
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}
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int Emulator::getparam( size_t N, int defaultval )
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{
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int ret = defaultval;
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if ( parsed_params.size() > N ) {
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ret = parsed_params[ N ];
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}
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if ( ret < 1 ) ret = defaultval;
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return ret;
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}
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void Cell::reset( void )
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{
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if ( overlapping_cell ) {
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assert( overlapped_cells.size() == 0 );
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contents.clear();
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} else {
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contents.clear();
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for ( std::vector<Cell *>::iterator i = overlapped_cells.begin();
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i != overlapped_cells.end();
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i++ ) {
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(*i)->overlapping_cell = NULL;
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(*i)->reset();
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}
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overlapped_cells.clear();
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}
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}
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