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Fix an issue where the last line of block-based diffs could be incorrectly hidden

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Summary:
Fixes T13468. See that task for discussion. The older source-rendering code mixes "line number" / "1-based" lists with "block number" / "0-based" lists and then has other bugs which cancel this out.

For block-based diffs, build an explicit block-based mask with only block numbers. This sort of sidesteps the whole issue.

Test Plan: Viewed the diff with the original reproduction case, plus various other block-based diffs, including one-block image diffs, in unified and side-by-side mode. Didn't spot any oddities.

Maniphest Tasks: T13468

Differential Revision: https://secure.phabricator.com/D20959
This commit is contained in:
epriestley 2020-01-30 08:14:10 -08:00
parent 12c3370988
commit ccf28a8112
2 changed files with 66 additions and 9 deletions
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64
src/applications/differential/parser/DifferentialHunkParser.php
View file

@ -354,6 +354,69 @@ final class DifferentialHunkParser extends Phobject {
return $this;
}
public function generateVisibleBlocksMask($lines_context) {
// See T13468. This is similar to "generateVisibleLinesMask()", but
// attempts to work around a series of bugs which cancel each other
// out but make a mess of the intermediate steps.
$old = $this->getOldLines();
$new = $this->getNewLines();
$length = max(count($old), count($new));
$visible_lines = array();
for ($ii = 0; $ii < $length; $ii++) {
$old_visible = (isset($old[$ii]) && $old[$ii]['type']);
$new_visible = (isset($new[$ii]) && $new[$ii]['type']);
$visible_lines[$ii] = ($old_visible || $new_visible);
}
$mask = array();
$reveal_cursor = -1;
for ($ii = 0; $ii < $length; $ii++) {
// If this line isn't visible, it isn't going to reveal anything.
if (!$visible_lines[$ii]) {
// If it hasn't been revealed by a nearby line, mark it as masked.
if (empty($mask[$ii])) {
$mask[$ii] = false;
}
continue;
}
// If this line is visible, reveal all the lines nearby.
// First, compute the minimum and maximum offsets we want to reveal.
$min_reveal = max($ii - $lines_context, 0);
$max_reveal = min($ii + $lines_context, $length - 1);
// Naively, we'd do more work than necessary when revealing context for
// several adjacent visible lines: we would mark all the overlapping
// lines as revealed several times.
// To avoid duplicating work, keep track of the largest line we've
// revealed to. Since we reveal context by marking every consecutive
// line, we don't need to touch any line above it.
$min_reveal = max($min_reveal, $reveal_cursor);
// Reveal the remaining unrevealed lines.
for ($jj = $min_reveal; $jj <= $max_reveal; $jj++) {
$mask[$jj] = true;
}
// Move the cursor to the next line which may still need to be revealed.
$reveal_cursor = $max_reveal + 1;
}
$this->setVisibleLinesMask($mask);
return $mask;
}
public function generateVisibleLinesMask($lines_context) {
$old = $this->getOldLines();
$new = $this->getNewLines();
@ -361,6 +424,7 @@ final class DifferentialHunkParser extends Phobject {
$visible = false;
$last = 0;
$mask = array();
for ($cursor = -$lines_context; $cursor < $max_length; $cursor++) {
$offset = $cursor + $lines_context;
if ((isset($old[$offset]) && $old[$offset]['type']) ||

11
src/applications/files/diff/PhabricatorDocumentEngineBlocks.php
View file

@ -59,7 +59,7 @@ final class PhabricatorDocumentEngineBlocks
->parseHunksForLineData($changeset->getHunks())
->reparseHunksForSpecialAttributes();
$hunk_parser->generateVisibleLinesMask(2);
$hunk_parser->generateVisibleBlocksMask(2);
$mask = $hunk_parser->getVisibleLinesMask();
$old_lines = $hunk_parser->getOldLines();
@ -72,14 +72,7 @@ final class PhabricatorDocumentEngineBlocks
$old_line = idx($old_lines, $ii);
$new_line = idx($new_lines, $ii);
$is_visible = !empty($mask[$ii + 1]);
// TODO: There's currently a bug where one-line files get incorrectly
// masked. This causes images to completely fail to render. Just ignore
// the mask if it came back empty.
if (!$mask) {
$is_visible = true;
}
$is_visible = !empty($mask[$ii]);
if ($old_line) {
$old_hash = rtrim($old_line['text'], "\n");