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//: A debugging helper that lets you zoom in/out on a trace.
//: browse the trace we just created
:(before "End Primitive Recipe Declarations")
_BROWSE_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$browse-trace", _BROWSE_TRACE);
:(before "End Primitive Recipe Checks")
case _BROWSE_TRACE: {
break;
}
:(before "End Primitive Recipe Implementations")
case _BROWSE_TRACE: {
start_trace_browser();
break;
}
//: browse a trace loaded from a file
:(after "Commandline Parsing")
if (argc == 3 && is_equal(argv[1], "browse-trace")) {
load_trace(argv[2]);
start_trace_browser();
return 0;
}
:(before "End Globals")
set<int> Visible;
int Top_of_screen = 0;
int Last_printed_row = 0;
map<int, int> Trace_index; // screen row -> trace index
:(code)
void start_trace_browser() {
if (!Trace_stream) return;
cerr << "computing min depth to display\n";
int min_depth = 9999;
for (int i = 0; i < SIZE(Trace_stream->past_lines); ++i) {
trace_line& curr_line = Trace_stream->past_lines.at(i);
if (curr_line.depth < min_depth) min_depth = curr_line.depth;
}
cerr << "min depth is " << min_depth << '\n';
cerr << "computing lines to display\n";
for (int i = 0; i < SIZE(Trace_stream->past_lines); ++i) {
if (Trace_stream->past_lines.at(i).depth == min_depth)
Visible.insert(i);
}
tb_init();
Display_row = Display_column = 0;
tb_event event;
Top_of_screen = 0;
refresh_screen_rows();
while (true) {
render();
do {
tb_poll_event(&event);
} while (event.type != TB_EVENT_KEY);
int key = event.key ? event.key : event.ch;
if (key == 'q' || key == 'Q') break;
if (key == 'j' || key == TB_KEY_ARROW_DOWN) {
// move cursor one line down
if (Display_row < Last_printed_row) ++Display_row;
}
if (key == 'k' || key == TB_KEY_ARROW_UP) {
// move cursor one line up
if (Display_row > 0) --Display_row;
}
if (key == 'H') {
// move cursor to top of screen
Display_row = 0;
}
if (key == 'M') {
// move cursor to center of screen
Display_row = tb_height()/2;
}
if (key == 'L') {
// move cursor to bottom of screen
Display_row = tb_height()-1;
}
if (key == 'J' || key == TB_KEY_PGDN) {
// page-down
if (Trace_index.find(tb_height()-1) != Trace_index.end()) {
Top_of_screen = get(Trace_index, tb_height()-1) + 1;
refresh_screen_rows();
}
}
if (key == 'K' || key == TB_KEY_PGUP) {
// page-up is more convoluted
for (int screen_row = tb_height(); screen_row > 0 && Top_of_screen > 0; --screen_row) {
--Top_of_screen;
if (Top_of_screen <= 0) break;
while (Top_of_screen > 0 && !contains_key(Visible, Top_of_screen))
--Top_of_screen;
}
if (Top_of_screen >= 0)
refresh_screen_rows();
}
if (key == 'G') {
// go to bottom of screen; largely like page-up, interestingly
Top_of_screen = SIZE(Trace_stream->past_lines)-1;
for (int screen_row = tb_height(); screen_row > 0 && Top_of_screen > 0; --screen_row) {
--Top_of_screen;
if (Top_of_screen <= 0) break;
while (Top_of_screen > 0 && !contains_key(Visible, Top_of_screen))
--Top_of_screen;
}
refresh_screen_rows();
// move cursor to bottom
Display_row = Last_printed_row;
refresh_screen_rows();
}
if (key == TB_KEY_CARRIAGE_RETURN) {
// expand lines under current by one level
assert(contains_key(Trace_index, Display_row));
int start_index = get(Trace_index, Display_row);
int index = 0;
// simultaneously compute end_index and min_depth
int min_depth = 9999;
for (index = start_index+1; index < SIZE(Trace_stream->past_lines); ++index) {
if (contains_key(Visible, index)) break;
trace_line& curr_line = Trace_stream->past_lines.at(index);
assert(curr_line.depth > Trace_stream->past_lines.at(start_index).depth);
if (curr_line.depth < min_depth) min_depth = curr_line.depth;
}
int end_index = index;
// mark as visible all intervening indices at min_depth
for (index = start_index; index < end_index; ++index) {
trace_line& curr_line = Trace_stream->past_lines.at(index);
if (curr_line.depth == min_depth) {
Visible.insert(index);
}
}
refresh_screen_rows();
}
if (key == TB_KEY_BACKSPACE || key == TB_KEY_BACKSPACE2) {
// collapse all lines under current
assert(contains_key(Trace_index, Display_row));
int start_index = get(Trace_index, Display_row);
int index = 0;
// end_index is the next line at a depth same as or lower than start_index
int initial_depth = Trace_stream->past_lines.at(start_index).depth;
for (index = start_index+1; index < SIZE(Trace_stream->past_lines); ++index) {
if (!contains_key(Visible, index)) continue;
trace_line& curr_line = Trace_stream->past_lines.at(index);
if (curr_line.depth <= initial_depth) break;
}
int end_index = index;
// mark as visible all intervening indices at min_depth
for (index = start_index+1; index < end_index; ++index) {
Visible.erase(index);
}
refresh_screen_rows();
}
}
tb_shutdown();
}
// update Trace_indices for each screen_row on the basis of Top_of_screen and Visible
void refresh_screen_rows() {
int screen_row = 0, index = 0;
Trace_index.clear();
for (screen_row = 0, index = Top_of_screen; screen_row < tb_height() && index < SIZE(Trace_stream->past_lines); ++screen_row, ++index) {
// skip lines without depth for now
while (!contains_key(Visible, index)) {
++index;
if (index >= SIZE(Trace_stream->past_lines)) goto done;
}
assert(index < SIZE(Trace_stream->past_lines));
put(Trace_index, screen_row, index);
}
done:;
}
void render() {
int screen_row = 0;
for (screen_row = 0; screen_row < tb_height(); ++screen_row) {
if (!contains_key(Trace_index, screen_row)) break;
trace_line& curr_line = Trace_stream->past_lines.at(get(Trace_index, screen_row));
ostringstream out;
out << std::setw(4) << curr_line.depth << ' ' << curr_line.label << ": " << curr_line.contents;
if (screen_row < tb_height()-1) {
int delta = lines_hidden(screen_row);
// home-brew escape sequence for red
if (delta > 999) out << "{";
out << " (" << delta << ")";
if (delta > 999) out << "}";
}
render_line(screen_row, out.str());
}
// clear rest of screen
Last_printed_row = screen_row-1;
for (; screen_row < tb_height(); ++screen_row) {
render_line(screen_row, "~");
}
// move cursor back to display row at the end
tb_set_cursor(0, Display_row);
tb_present();
}
int lines_hidden(int screen_row) {
assert(contains_key(Trace_index, screen_row));
if (!contains_key(Trace_index, screen_row+1))
return SIZE(Trace_stream->past_lines) - get(Trace_index, screen_row);
else
return get(Trace_index, screen_row+1) - get(Trace_index, screen_row);
}
void render_line(int screen_row, const string& s) {
int col = 0;
int color = TB_WHITE;
for (col = 0; col < tb_width() && col < SIZE(s); ++col) {
char c = s.at(col); // todo: unicode
if (c == '\n') c = ';'; // replace newlines with semi-colons
// escapes. hack: can't start a line with them.
if (c == '{') { color = /*red*/1; c = ' '; }
if (c == '}') { color = TB_WHITE; c = ' '; }
tb_change_cell(col, screen_row, c, color, TB_BLACK);
}
for (; col < tb_width(); ++col) {
tb_change_cell(col, screen_row, ' ', TB_WHITE, TB_BLACK);
}
}
void load_trace(const char* filename) {
ifstream tin(filename);
if (!tin) {
cerr << "no such file: " << filename << '\n';
exit(1);
}
Trace_stream = new trace_stream;
while (has_data(tin)) {
tin >> std::noskipws;
skip_whitespace_but_not_newline(tin);
if (!isdigit(tin.peek())) {
string dummy;
getline(tin, dummy);
continue;
}
tin >> std::skipws;
int depth;
tin >> depth;
string label;
tin >> label;
if (*--label.end() == ':') label.erase(--label.end());
string line;
getline(tin, line);
Trace_stream->past_lines.push_back(trace_line(depth, label, line));
}
cerr << "lines read: " << Trace_stream->past_lines.size() << '\n';
}
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