Keith Winstein
504 lines
13 KiB
C++
504 lines
13 KiB
C++
#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.hpp"
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using namespace Overlay;
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void ConditionalOverlayCell::apply( Framebuffer &fb, bool show_tentative, 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 && (!show_tentative) ) {
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return;
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}
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/*
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fprintf( stderr, "APPLYING char %lc to (%d, %d)\n",
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replacement.debug_contents(), row, col );
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*/
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if ( !(*(fb.get_cell( row, col )) == replacement) ) {
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*(fb.get_mutable_cell( row, col )) = replacement;
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uint64_t now = timestamp();
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if ( display_time >= now ) {
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display_time = now;
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}
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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, uint64_t current_frame ) 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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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 ( (current_frame < expiration_frame) ) {
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return Pending;
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}
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/* special case deletion */
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if ( current.contents.empty() && (replacement.contents.size() == 1) && (replacement.contents.front() == 0x20) ) {
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return Correct;
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}
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if ( current == replacement ) {
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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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Validity ConditionalCursorMove::get_validity( const Framebuffer &fb, uint64_t current_frame ) 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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fprintf( stderr, "Crazy cursor (%d,%d)!\n", row, col );
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return IncorrectOrExpired;
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}
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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 if ( current_frame < expiration_frame ) {
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return Pending;
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} else {
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fprintf( stderr, "Bad cursor in %d (i thought %d vs %d).\n", (int)current_frame,
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col, fb.ds.get_cursor_col() );
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return IncorrectOrExpired;
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}
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}
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void ConditionalCursorMove::apply( Framebuffer &fb ) const
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{
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if ( !active ) {
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return;
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}
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int target_row = row;
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int target_col = col;
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if ( show_frozen_cursor ) {
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target_row = frozen_row;
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target_col = frozen_col;
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}
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assert( target_row < fb.ds.get_height() );
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assert( target_col < fb.ds.get_width() );
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assert( !fb.ds.origin_mode );
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fb.ds.move_row( target_row, false );
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fb.ds.move_col( target_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 message_delay = notifications.get_message_expiration() - timestamp();
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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( timestamp() ) && ( next_expiry > 1000 ) ) {
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next_expiry = 1000;
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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, bool show_tentative, 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, show_tentative, 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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if ( (score > 0) || cursor.show_frozen_cursor ) {
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cursor.apply( fb );
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}
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for_each( overlays.begin(), overlays.end(), [&]( const ConditionalOverlayRow &x ){ x.apply( fb, score > 0, flagging ); } );
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}
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void PredictionEngine::reset( void )
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{
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overlays.clear();
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cursor.reset();
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become_tentative();
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}
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void PredictionEngine::cull( const Framebuffer &fb )
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{
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if ( score > 0 ) {
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cursor.thaw();
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}
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uint64_t now = timestamp();
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/* don't increment score just for correct cursor position */
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switch ( cursor.get_validity( fb, local_frame_acked) ) {
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case IncorrectOrExpired:
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cursor.reset();
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become_tentative();
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return;
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break;
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default:
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break;
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}
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uint64_t max_delay = 0;
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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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switch ( j->get_validity( fb, i->row_num, local_frame_acked ) ) {
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case IncorrectOrExpired:
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if ( j->tentative ) {
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fprintf( stderr, "Bad tentative prediction in row %d, col %d (thought %lc, was %lc)\n",
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i->row_num, j->col,
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j->replacement.debug_contents(), fb.get_cell( i->row_num, j->col )->debug_contents() );
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j->reset();
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become_tentative();
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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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} else {
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fprintf( stderr, "[%d=>%d] (score=%d) Killing prediction in row %d, col %d (thought %lc, was %lc)\n",
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(int)local_frame_acked, (int)j->expiration_frame,
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score,
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i->row_num, j->col,
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j->replacement.debug_contents(), fb.get_cell( i->row_num, j->col )->debug_contents() );
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reset();
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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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return;
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}
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break;
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case Correct:
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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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j->reset();
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if ( j->prediction_time > prediction_checkpoint ) {
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score++;
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}
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break;
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case Pending:
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max_delay = max( max_delay, now - j->prediction_time );
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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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if ( max_delay > 100 ) {
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flagging = true;
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} else if ( max_delay < 50 ) {
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flagging = false;
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}
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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++ ) {
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r.overlay_cells.push_back( ConditionalOverlayCell( i ) );
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assert( r.overlay_cells[ i ].col == i );
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}
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overlays.push_back( r );
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return overlays.back();
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}
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}
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void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
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{
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list<Parser::Action *> actions( parser.input( the_byte ) );
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uint64_t now = timestamp();
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for ( auto it = actions.begin(); it != actions.end(); it++ ) {
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Parser::Action *act = *it;
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if ( typeid( *act ) == typeid( Parser::Print ) ) {
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/* make new prediction */
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wchar_t ch = act->ch;
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/* XXX handle wide characters */
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if ( !cursor.active ) {
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/* initialize new cursor prediction */
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cursor.row = fb.ds.get_cursor_row();
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cursor.col = fb.ds.get_cursor_col();
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cursor.active = true;
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cursor.prediction_time = now;
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cursor.expiration_frame = local_frame_sent + 1;
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}
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if ( ch == 0x7f ) { /* backspace */
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// fprintf( stderr, "Backspace.\n" );
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if ( cursor.col > 0 ) {
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cursor.col--;
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cursor.prediction_time = now;
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cursor.expiration_frame = local_frame_sent + 1;
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ConditionalOverlayCell &cell = get_or_make_row( cursor.row, fb.ds.get_width() ).overlay_cells[ cursor.col ];
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cell.active = true;
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cell.tentative = (score <= 0);
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cell.prediction_time = now;
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cell.expiration_frame = local_frame_sent + 1;
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cell.replacement.renditions = fb.ds.get_renditions();
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cell.replacement.contents.clear();
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cell.replacement.contents.push_back( 0x20 );
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cell.display_time = -1;
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}
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} else if ( (ch < 0x20) || (ch > 0x7E) ) {
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/* unknown print */
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become_tentative();
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} else {
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/* don't attempt to change existing blank or space cells if user has typed space */
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const Cell *existing_cell = fb.get_cell( cursor.row, cursor.col );
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if ( ( existing_cell->contents.empty() || ((existing_cell->contents.size() == 1)
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&& ( (existing_cell->contents.front() == 0x20)
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|| (existing_cell->contents.front() == 0xA0) )))
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&& ( ch == 0x20 ) ) {
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/* do nothing */
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} else {
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assert( cursor.row >= 0 );
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assert( cursor.col >= 0 );
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assert( cursor.row < fb.ds.get_height() );
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assert( cursor.col < fb.ds.get_width() );
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if ( cursor.col + 1 >= fb.ds.get_width() ) {
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/* prediction in the last column is tricky */
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/* e.g., emacs will show wrap character, shell will just put the character there */
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become_tentative();
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cursor.freeze();
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}
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ConditionalOverlayCell &cell = get_or_make_row( cursor.row, fb.ds.get_width() ).overlay_cells[ cursor.col ];
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cell.active = true;
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cell.tentative = (score <= 0);
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cell.prediction_time = now;
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cell.expiration_frame = local_frame_sent + 1;
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cell.replacement.renditions = fb.ds.get_renditions();
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cell.replacement.contents.clear();
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cell.replacement.contents.push_back( ch );
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cell.display_time = -1;
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/*
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fprintf( stderr, "[%d=>%d] Predicting %lc in row %d, col %d\n",
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(int)local_frame_acked, (int)cell.expiration_frame,
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ch, cursor.row, cursor.col );
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*/
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}
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cursor.prediction_time = now;
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cursor.expiration_frame = local_frame_sent + 1;
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cursor.col++;
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/* do we need to wrap? */
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if ( cursor.col >= fb.ds.get_width() ) {
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become_tentative();
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cursor.col--;
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cursor.freeze();
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cursor.col = 0;
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if ( cursor.row == fb.ds.get_height() - 1 ) {
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for ( auto i = overlays.begin(); i != overlays.end(); i++ ) {
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i->row_num--;
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for ( auto j = i->overlay_cells.begin(); j != i->overlay_cells.end(); j++ ) {
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if ( j->active ) {
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// j->tentative = (score <= 0);
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j->prediction_time = now;
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j->expiration_frame = local_frame_sent + 1;
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}
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}
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}
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} else {
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cursor.row++;
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}
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}
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}
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} else if ( typeid( *act ) == typeid( Parser::Execute ) ) {
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become_tentative();
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cursor.freeze();
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}
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delete act;
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}
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}
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void PredictionEngine::become_tentative( void )
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{
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prediction_checkpoint = timestamp();
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score = 0;
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}
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