Separate modules by subdirectory
This commit is contained in:
Keith Winstein
@@ -0,0 +1,720 @@
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#include <algorithm>
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#include <wchar.h>
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#include <list>
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#include <typeinfo>
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#include <limits.h>
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#include "terminaloverlay.h"
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using namespace Overlay;
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bool ConditionalOverlay::start_clock( uint64_t local_frame_acked, uint64_t now, unsigned int send_interval )
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{
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if ( (local_frame_acked >= expiration_frame) && (expiration_time == uint64_t(-1)) ) {
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expiration_time = now + 50 + 125 * send_interval / 100;
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return true;
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}
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return false;
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}
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void ConditionalOverlayCell::apply( Framebuffer &fb, uint64_t confirmed_epoch, int row, bool flag ) const
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{
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if ( (!active)
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|| (row >= fb.ds.get_height())
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|| (col >= fb.ds.get_width()) ) {
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return;
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}
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if ( tentative( confirmed_epoch ) ) {
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return;
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}
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if ( unknown ) {
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if ( flag && ( col != fb.ds.get_width() - 1 ) ) {
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fb.get_mutable_cell( row, col )->renditions.underlined = true;
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}
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return;
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}
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if ( !(*(fb.get_cell( row, col )) == replacement) ) {
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if ( replacement.is_blank() && fb.get_cell( row, col )->is_blank() ) {
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return;
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}
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*(fb.get_mutable_cell( row, col )) = replacement;
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if ( flag ) {
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fb.get_mutable_cell( row, col )->renditions.underlined = true;
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}
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}
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}
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Validity ConditionalOverlayCell::get_validity( const Framebuffer &fb, int row,
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uint64_t sent_frame, uint64_t early_ack, uint64_t late_ack,
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uint64_t now ) const
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{
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if ( !active ) {
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return Inactive;
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}
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if ( (row >= fb.ds.get_height())
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|| (col >= fb.ds.get_width()) ) {
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return IncorrectOrExpired;
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}
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if ( unknown ) {
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return CorrectNoCredit;
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}
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const Cell ¤t = *( fb.get_cell( row, col ) );
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/* see if it hasn't been updated yet */
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if ( early_ack < expiration_frame ) {
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return Pending;
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}
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assert( expiration_time != uint64_t(-1) );
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if ( (late_ack >= expiration_frame)
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|| ( (sent_frame <= early_ack) && (expiration_time <= now) ) ) {
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/* special case deletion */
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if ( current.is_blank() && replacement.is_blank() ) {
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return CorrectNoCredit;
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}
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if ( current.contents == replacement.contents ) {
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auto it = find_if( original_contents.begin(), original_contents.end(),
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[&]( const Cell &x ) { return replacement.contents == x.contents; } );
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if ( it == original_contents.end() ) {
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return Correct;
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} else {
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return CorrectNoCredit;
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}
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} else {
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return IncorrectOrExpired;
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}
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}
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return Pending;
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}
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Validity ConditionalCursorMove::get_validity( const Framebuffer &fb, uint64_t sent_frame, uint64_t early_ack, uint64_t late_ack, uint64_t now ) const
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{
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if ( !active ) {
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return Inactive;
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}
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if ( (row >= fb.ds.get_height())
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|| (col >= fb.ds.get_width()) ) {
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assert( false );
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// fprintf( stderr, "Crazy cursor (%d,%d)!\n", row, col );
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return IncorrectOrExpired;
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}
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if ( early_ack < expiration_frame ) {
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return Pending;
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}
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assert( expiration_time != uint64_t(-1) );
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if ( (late_ack >= expiration_frame)
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|| ( (sent_frame <= early_ack) && (expiration_time <= now) ) ) {
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if ( (fb.ds.get_cursor_col() == col)
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&& (fb.ds.get_cursor_row() == row) ) {
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return Correct;
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} else {
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return IncorrectOrExpired;
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}
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}
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return Pending;
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}
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void ConditionalCursorMove::apply( Framebuffer &fb, uint64_t confirmed_epoch ) const
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{
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if ( !active ) {
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return;
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}
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if ( tentative( confirmed_epoch ) ) {
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return;
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}
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assert( row < fb.ds.get_height() );
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assert( col < fb.ds.get_width() );
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assert( !fb.ds.origin_mode );
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fb.ds.move_row( row, false );
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fb.ds.move_col( col, false, false );
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}
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NotificationEngine::NotificationEngine()
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: last_word_from_server( timestamp() ),
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message(),
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message_expiration( -1 )
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{}
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void NotificationEngine::apply( Framebuffer &fb ) const
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{
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uint64_t now = timestamp();
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bool time_expired = need_countup( now );
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if ( message.empty() && !time_expired ) {
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return;
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}
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assert( fb.ds.get_width() > 0 );
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assert( fb.ds.get_height() > 0 );
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/* hide cursor if necessary */
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if ( fb.ds.get_cursor_row() == 0 ) {
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fb.ds.cursor_visible = false;
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}
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/* draw bar across top of screen */
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Cell notification_bar( 0 );
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notification_bar.renditions.foreground_color = 37;
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notification_bar.renditions.background_color = 44;
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notification_bar.contents.push_back( 0x20 );
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for ( int i = 0; i < fb.ds.get_width(); i++ ) {
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*(fb.get_mutable_cell( 0, i )) = notification_bar;
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}
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/* write message */
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wchar_t tmp[ 128 ];
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if ( message.empty() && (!time_expired) ) {
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return;
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} else if ( message.empty() && time_expired ) {
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swprintf( tmp, 128, L"mosh: Last contact %.0f seconds ago. [To quit: Ctrl-^ .]", (double)(now - last_word_from_server) / 1000.0 );
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} else if ( (!message.empty()) && (!time_expired) ) {
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swprintf( tmp, 128, L"mosh: %ls [To quit: Ctrl-^ .]", message.c_str() );
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} else {
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swprintf( tmp, 128, L"mosh: %ls (%.0f s without contact.) [To quit: Ctrl-^ .]", message.c_str(),
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(double)(now - last_word_from_server) / 1000.0 );
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}
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wstring string_to_draw( tmp );
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int overlay_col = 0;
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Cell *combining_cell = fb.get_mutable_cell( 0, 0 );
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/* We unfortunately duplicate the terminal's logic for how to render a Unicode sequence into graphemes */
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for ( wstring::const_iterator i = string_to_draw.begin(); i != string_to_draw.end(); i++ ) {
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if ( overlay_col >= fb.ds.get_width() ) {
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break;
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}
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wchar_t ch = *i;
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int chwidth = ch == L'\0' ? -1 : wcwidth( ch );
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Cell *this_cell = nullptr;
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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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this_cell = fb.get_mutable_cell( 0, overlay_col );
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fb.reset_cell( this_cell );
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this_cell->renditions.bold = true;
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this_cell->renditions.foreground_color = 37;
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this_cell->renditions.background_color = 44;
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this_cell->contents.push_back( ch );
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this_cell->width = chwidth;
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combining_cell = this_cell;
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overlay_col += chwidth;
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break;
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case 0: /* combining character */
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if ( !combining_cell ) {
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break;
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}
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if ( combining_cell->contents.size() == 0 ) {
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assert( combining_cell->width == 1 );
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combining_cell->fallback = true;
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overlay_col++;
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}
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if ( combining_cell->contents.size() < 16 ) {
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combining_cell->contents.push_back( ch );
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}
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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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}
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void NotificationEngine::adjust_message( void )
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{
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if ( timestamp() >= message_expiration ) {
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message.clear();
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}
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}
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void OverlayManager::apply( Framebuffer &fb )
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{
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predictions.cull( fb );
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predictions.apply( fb );
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notifications.adjust_message();
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notifications.apply( fb );
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title.apply( fb );
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}
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int OverlayManager::wait_time( void )
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{
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uint64_t next_expiry = INT_MAX;
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uint64_t now = timestamp();
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uint64_t message_delay = notifications.get_message_expiration() - now;
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if ( message_delay < next_expiry ) {
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next_expiry = message_delay;
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}
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if ( notifications.need_countup( now ) && ( next_expiry > 1000 ) ) {
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next_expiry = 1000;
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}
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if ( predictions.active() && ( next_expiry > 10 ) ) {
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next_expiry = 10;
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}
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return next_expiry;
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}
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void TitleEngine::set_prefix( const wstring s )
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{
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prefix = deque<wchar_t>( s.begin(), s.end() );
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}
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void ConditionalOverlayRow::apply( Framebuffer &fb, uint64_t confirmed_epoch, bool flag ) const
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{
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for_each( overlay_cells.begin(), overlay_cells.end(), [&]( const ConditionalOverlayCell &x ) { x.apply( fb, confirmed_epoch, row_num, flag ); } );
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}
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void PredictionEngine::apply( Framebuffer &fb ) const
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{
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for_each( cursors.begin(), cursors.end(), [&]( const ConditionalCursorMove &x ) { x.apply( fb, confirmed_epoch ); } );
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for_each( overlays.begin(), overlays.end(), [&]( const ConditionalOverlayRow &x ){ x.apply( fb, confirmed_epoch, flagging ); } );
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}
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void PredictionEngine::kill_epoch( uint64_t epoch, const Framebuffer &fb )
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{
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cursors.remove_if( [&]( ConditionalCursorMove &x ) { return x.tentative( epoch - 1 ); } );
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cursors.push_back( ConditionalCursorMove( local_frame_sent + 1,
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fb.ds.get_cursor_row(),
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fb.ds.get_cursor_col(),
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prediction_epoch ) );
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cursor().active = true;
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for ( auto i = overlays.begin(); i != overlays.end(); i++ ) {
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for ( auto j = i->overlay_cells.begin(); j != i->overlay_cells.end(); j++ ) {
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if ( j->tentative( epoch - 1 ) ) {
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j->reset();
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}
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}
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}
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become_tentative();
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}
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void PredictionEngine::reset( void )
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{
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cursors.clear();
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overlays.clear();
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become_tentative();
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// fprintf( stderr, "RESETTING\n" );
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}
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void PredictionEngine::init_cursor( const Framebuffer &fb )
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{
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if ( cursors.empty() ) {
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/* initialize new cursor prediction */
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cursors.push_back( ConditionalCursorMove( local_frame_sent + 1,
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fb.ds.get_cursor_row(),
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fb.ds.get_cursor_col(),
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prediction_epoch ) );
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cursor().active = true;
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} else if ( cursor().tentative_until_epoch != prediction_epoch ) {
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cursors.push_back( ConditionalCursorMove( local_frame_sent + 1,
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cursor().row,
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cursor().col,
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prediction_epoch ) );
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cursor().active = true;
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}
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}
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void PredictionEngine::cull( const Framebuffer &fb )
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{
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uint64_t now = timestamp();
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/* control flagging with hysteresis */
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if ( send_interval > 80 ) {
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flagging = true;
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} else if ( send_interval < 50 ) {
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flagging = false;
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}
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/* go through cell predictions */
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auto i = overlays.begin();
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while ( i != overlays.end() ) {
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auto inext = i;
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inext++;
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if ( (i->row_num < 0) || (i->row_num >= fb.ds.get_height()) ) {
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overlays.erase( i );
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i = inext;
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continue;
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}
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for ( auto j = i->overlay_cells.begin(); j != i->overlay_cells.end(); j++ ) {
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if ( j->start_clock( local_frame_acked, now, send_interval ) ) {
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last_scheduled_timeout = max( last_scheduled_timeout, j->expiration_time );
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}
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switch ( j->get_validity( fb, i->row_num,
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local_frame_sent, local_frame_acked, local_frame_late_acked,
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now ) ) {
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case IncorrectOrExpired:
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if ( j->tentative( confirmed_epoch ) ) {
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/*
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fprintf( stderr, "Bad tentative prediction in row %d, col %d (think %lc, actually %lc)\n",
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i->row_num, j->col,
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j->replacement.debug_contents(),
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fb.get_cell( i->row_num, j->col )->debug_contents()
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);
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*/
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kill_epoch( j->tentative_until_epoch, fb );
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/*
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if ( j->display_time != uint64_t(-1) ) {
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fprintf( stderr, "TIMING %ld - %ld (TENT)\n", time(NULL), now - j->display_time );
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}
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*/
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} else {
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/*
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fprintf( stderr, "[%d=>%d] Killing prediction in row %d, col %d (think %lc, actually %lc)\n",
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(int)local_frame_acked, (int)j->expiration_frame,
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i->row_num, j->col,
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j->replacement.debug_contents(),
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fb.get_cell( i->row_num, j->col )->debug_contents() );
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*/
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/*
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if ( j->display_time != uint64_t(-1) ) {
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fprintf( stderr, "TIMING %ld - %ld\n", time(NULL), now - j->display_time );
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}
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*/
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reset();
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return;
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}
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break;
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case Correct:
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/*
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if ( j->display_time != uint64_t(-1) ) {
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fprintf( stderr, "TIMING %ld + %ld\n", now, now - j->display_time );
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}
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*/
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if ( j->tentative_until_epoch > confirmed_epoch ) {
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confirmed_epoch = j->tentative_until_epoch;
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/*
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fprintf( stderr, "%lc in (%d,%d) confirms epoch %lu (predicting in epoch %lu)\n",
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j->replacement.debug_contents(), i->row_num, j->col,
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confirmed_epoch, prediction_epoch );
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*/
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}
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/* no break */
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case CorrectNoCredit:
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j->reset();
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break;
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case Pending:
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break;
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default:
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break;
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}
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}
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i = inext;
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}
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/* go through cursor predictions */
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for ( auto it = cursors.begin(); it != cursors.end(); it++ ) {
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if ( it->start_clock( local_frame_acked, now, send_interval ) ) {
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last_scheduled_timeout = max( last_scheduled_timeout, it->expiration_time );
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}
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}
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if ( !cursors.empty() ) {
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if ( cursor().get_validity( fb,
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local_frame_sent, local_frame_acked, local_frame_late_acked,
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now ) == IncorrectOrExpired ) {
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/*
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fprintf( stderr, "Sadly, we're predicting (%d,%d) vs. (%d,%d) [tau: %ld, expiration_time=%ld, now=%ld]\n",
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cursor().row, cursor().col,
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fb.ds.get_cursor_row(),
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fb.ds.get_cursor_col(),
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cursor().tentative_until_epoch,
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cursor().expiration_time,
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now );
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*/
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reset();
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return;
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}
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}
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cursors.remove_if( [&]( const ConditionalCursorMove &x ) {
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return (x.get_validity( fb,
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local_frame_sent, local_frame_acked, local_frame_late_acked,
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now ) != Pending); } );
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}
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ConditionalOverlayRow & PredictionEngine::get_or_make_row( int row_num, int num_cols )
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{
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auto it = find_if( overlays.begin(), overlays.end(),
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[&]( const ConditionalOverlayRow &x ) { return x.row_num == row_num; } );
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if ( it != overlays.end() ) {
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return *it;
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} else {
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/* make row */
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ConditionalOverlayRow r( row_num );
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r.overlay_cells.reserve( num_cols );
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for ( int i = 0; i < num_cols; i++ ) {
|
||||
r.overlay_cells.push_back( ConditionalOverlayCell( 0, i, prediction_epoch ) );
|
||||
assert( r.overlay_cells[ i ].col == i );
|
||||
}
|
||||
overlays.push_back( r );
|
||||
return overlays.back();
|
||||
}
|
||||
}
|
||||
|
||||
void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
|
||||
{
|
||||
cull( fb );
|
||||
|
||||
/* translate application-mode cursor control function to ANSI cursor control sequence */
|
||||
if ( (last_byte == 0x1b)
|
||||
&& (the_byte == 'O') ) {
|
||||
the_byte = '[';
|
||||
}
|
||||
last_byte = the_byte;
|
||||
|
||||
list<Parser::Action *> actions( parser.input( the_byte ) );
|
||||
|
||||
for ( auto it = actions.begin(); it != actions.end(); it++ ) {
|
||||
Parser::Action *act = *it;
|
||||
|
||||
/*
|
||||
fprintf( stderr, "Action: %s (%lc)\n",
|
||||
act->name().c_str(), act->char_present ? act->ch : L'_' );
|
||||
*/
|
||||
|
||||
if ( typeid( *act ) == typeid( Parser::Print ) ) {
|
||||
/* make new prediction */
|
||||
|
||||
init_cursor( fb );
|
||||
|
||||
assert( act->char_present );
|
||||
|
||||
wchar_t ch = act->ch;
|
||||
/* XXX handle wide characters */
|
||||
|
||||
if ( ch == 0x7f ) { /* backspace */
|
||||
// fprintf( stderr, "Backspace.\n" );
|
||||
ConditionalOverlayRow &the_row = get_or_make_row( cursor().row, fb.ds.get_width() );
|
||||
|
||||
if ( cursor().col > 0 ) {
|
||||
cursor().col--;
|
||||
cursor().expire( local_frame_sent + 1 );
|
||||
|
||||
for ( int i = cursor().col; i < fb.ds.get_width(); i++ ) {
|
||||
ConditionalOverlayCell &cell = the_row.overlay_cells[ i ];
|
||||
|
||||
cell.reset_with_orig();
|
||||
cell.active = true;
|
||||
cell.tentative_until_epoch = prediction_epoch;
|
||||
cell.expire( local_frame_sent + 1 );
|
||||
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
|
||||
|
||||
if ( i + 2 < fb.ds.get_width() ) {
|
||||
ConditionalOverlayCell &next_cell = the_row.overlay_cells[ i + 1 ];
|
||||
const Cell *next_cell_actual = fb.get_cell( cursor().row, i + 1 );
|
||||
|
||||
if ( next_cell.active ) {
|
||||
if ( next_cell.unknown ) {
|
||||
cell.unknown = true;
|
||||
} else {
|
||||
cell.unknown = false;
|
||||
cell.replacement = next_cell.replacement;
|
||||
}
|
||||
} else {
|
||||
cell.unknown = false;
|
||||
cell.replacement = *next_cell_actual;
|
||||
}
|
||||
} else {
|
||||
cell.unknown = true;
|
||||
}
|
||||
}
|
||||
}
|
||||
} else if ( (ch < 0x20) || (wcwidth( ch ) != 1) ) {
|
||||
/* unknown print */
|
||||
become_tentative();
|
||||
// fprintf( stderr, "Unknown print 0x%x\n", ch );
|
||||
} else {
|
||||
assert( cursor().row >= 0 );
|
||||
assert( cursor().col >= 0 );
|
||||
assert( cursor().row < fb.ds.get_height() );
|
||||
assert( cursor().col < fb.ds.get_width() );
|
||||
|
||||
ConditionalOverlayRow &the_row = get_or_make_row( cursor().row, fb.ds.get_width() );
|
||||
|
||||
if ( cursor().col + 1 >= fb.ds.get_width() ) {
|
||||
/* prediction in the last column is tricky */
|
||||
/* e.g., emacs will show wrap character, shell will just put the character there */
|
||||
become_tentative();
|
||||
}
|
||||
|
||||
/* do the insert */
|
||||
for ( int i = fb.ds.get_width() - 1; i > cursor().col; i-- ) {
|
||||
ConditionalOverlayCell &cell = the_row.overlay_cells[ i ];
|
||||
cell.reset_with_orig();
|
||||
cell.active = true;
|
||||
cell.tentative_until_epoch = prediction_epoch;
|
||||
cell.expire( local_frame_sent + 1 );
|
||||
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
|
||||
|
||||
ConditionalOverlayCell &prev_cell = the_row.overlay_cells[ i - 1 ];
|
||||
const Cell *prev_cell_actual = fb.get_cell( cursor().row, i - 1 );
|
||||
|
||||
if ( i == fb.ds.get_width() - 1 ) {
|
||||
cell.unknown = true;
|
||||
} else if ( prev_cell.active ) {
|
||||
if ( prev_cell.unknown ) {
|
||||
cell.unknown = true;
|
||||
} else {
|
||||
cell.unknown = false;
|
||||
cell.replacement = prev_cell.replacement;
|
||||
}
|
||||
} else {
|
||||
cell.unknown = false;
|
||||
cell.replacement = *prev_cell_actual;
|
||||
}
|
||||
}
|
||||
|
||||
ConditionalOverlayCell &cell = the_row.overlay_cells[ cursor().col ];
|
||||
cell.reset_with_orig();
|
||||
cell.active = true;
|
||||
cell.tentative_until_epoch = prediction_epoch;
|
||||
cell.expire( local_frame_sent + 1 );
|
||||
cell.replacement.renditions = fb.ds.get_renditions();
|
||||
cell.replacement.contents.clear();
|
||||
cell.replacement.contents.push_back( ch );
|
||||
cell.original_contents.push_back( *fb.get_cell( cursor().row, cursor().col ) );
|
||||
|
||||
/*
|
||||
fprintf( stderr, "[%d=>%d] Predicting %lc in row %d, col %d [tue: %lu]\n",
|
||||
(int)local_frame_acked, (int)cell.expiration_frame,
|
||||
ch, cursor().row, cursor().col,
|
||||
cell.tentative_until_epoch );
|
||||
*/
|
||||
|
||||
cursor().expire( local_frame_sent + 1 );
|
||||
|
||||
/* do we need to wrap? */
|
||||
if ( cursor().col < fb.ds.get_width() - 1 ) {
|
||||
cursor().col++;
|
||||
} else {
|
||||
become_tentative();
|
||||
newline_carriage_return( fb );
|
||||
}
|
||||
}
|
||||
} else if ( typeid( *act ) == typeid( Parser::Execute ) ) {
|
||||
if ( act->char_present && (act->ch == 0x0d) /* CR */ ) {
|
||||
become_tentative();
|
||||
newline_carriage_return( fb );
|
||||
} else {
|
||||
// fprintf( stderr, "Execute 0x%x\n", act->ch );
|
||||
become_tentative();
|
||||
}
|
||||
} else if ( typeid( *act ) == typeid( Parser::Esc_Dispatch ) ) {
|
||||
// fprintf( stderr, "Escape sequence\n" );
|
||||
become_tentative();
|
||||
} else if ( typeid( *act ) == typeid( Parser::CSI_Dispatch ) ) {
|
||||
if ( act->char_present && (act->ch == L'C') ) { /* right arrow */
|
||||
init_cursor( fb );
|
||||
if ( cursor().col < fb.ds.get_width() - 1 ) {
|
||||
cursor().col++;
|
||||
cursor().expire( local_frame_sent + 1 );
|
||||
}
|
||||
} else if ( act->char_present && (act->ch == L'D') ) { /* left arrow */
|
||||
init_cursor( fb );
|
||||
|
||||
if ( cursor().col > 0 ) {
|
||||
cursor().col--;
|
||||
cursor().expire( local_frame_sent + 1 );
|
||||
}
|
||||
} else {
|
||||
// fprintf( stderr, "CSI sequence %lc\n", act->ch );
|
||||
become_tentative();
|
||||
}
|
||||
} else if ( typeid( *act ) == typeid( Parser::Clear ) ) {
|
||||
|
||||
}
|
||||
|
||||
delete act;
|
||||
}
|
||||
}
|
||||
|
||||
void PredictionEngine::newline_carriage_return( const Framebuffer &fb )
|
||||
{
|
||||
init_cursor( fb );
|
||||
cursor().col = 0;
|
||||
if ( cursor().row == fb.ds.get_height() - 1 ) {
|
||||
for ( auto i = overlays.begin(); i != overlays.end(); i++ ) {
|
||||
i->row_num--;
|
||||
for ( auto j = i->overlay_cells.begin(); j != i->overlay_cells.end(); j++ ) {
|
||||
if ( j->active ) {
|
||||
j->expire( local_frame_sent + 1 );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* make blank prediction for last row */
|
||||
ConditionalOverlayRow &the_row = get_or_make_row( cursor().row, fb.ds.get_width() );
|
||||
for ( auto j = the_row.overlay_cells.begin(); j != the_row.overlay_cells.end(); j++ ) {
|
||||
j->active = true;
|
||||
j->tentative_until_epoch = prediction_epoch;
|
||||
j->expire( local_frame_sent + 1 );
|
||||
j->replacement.contents.clear();
|
||||
}
|
||||
} else {
|
||||
cursor().row++;
|
||||
}
|
||||
}
|
||||
|
||||
void PredictionEngine::become_tentative( void )
|
||||
{
|
||||
prediction_epoch++;
|
||||
|
||||
/*
|
||||
fprintf( stderr, "Now tentative in epoch %lu (confirmed=%lu)\n",
|
||||
prediction_epoch, confirmed_epoch );
|
||||
*/
|
||||
}
|
||||
Reference in New Issue
Block a user