mirror of
https://we.phorge.it/source/phorge.git
synced 2024-11-25 00:02:41 +01:00
039a5a6d86
Summary:
Simplify whitespace-ignoring diffing:
- Currently, we generate two diffs (one ignoring whitespace, one normal) and then copy the //text content// from the normal one to the whitespace-ignoring one.
- Instead, copy the //change types// from the ignoring one to the normal one.
- This is cheaper and much simpler.
- It means that we have the right change types in reparseHunksForSpecialAttributes(), and can simplify some other things.
Simplify whitespace changes, unchanged files, and deleted file detections:
- Currently, we do this inline with a bunch of other stuff, in the reparse step.
- Instead, do it separately. This is simpler.
Simplify intraline whitespace handling:
- Currently, this is a complicated mess that makes roughly zero sense.
- Instead, do it in reparse in a straightforward way.
Partially fix handling of files changed only by changing whitespace.
Partially fix handling of unchanged files.
Test Plan:
- Ran unit tests.
- Created context-less diffs, verified they rendered reasonably.
- Generated a diff with prefix whitespace, suffix whitespace, intraline whitespace, and non-whitespace changes. Verified changes rendered correctly in "ignore most" and "show all" modes.
- Verified unchanged files and files with only whitspace changes render with the correct masks.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4398
650 lines
18 KiB
PHP
650 lines
18 KiB
PHP
<?php
|
|
|
|
final class DifferentialHunkParser {
|
|
|
|
private $oldLines;
|
|
private $newLines;
|
|
private $intraLineDiffs;
|
|
private $visibleLinesMask;
|
|
private $whitespaceMode;
|
|
|
|
/**
|
|
* Get a map of lines on which hunks start, other than line 1. This
|
|
* datastructure is used to determine when to render "Context not available."
|
|
* in diffs with multiple hunks.
|
|
*
|
|
* @return dict<int, bool> Map of lines where hunks start, other than line 1.
|
|
*/
|
|
public function getHunkStartLines(array $hunks) {
|
|
assert_instances_of($hunks, 'DifferentialHunk');
|
|
|
|
$map = array();
|
|
foreach ($hunks as $hunk) {
|
|
$line = $hunk->getOldOffset();
|
|
if ($line > 1) {
|
|
$map[$line] = true;
|
|
}
|
|
}
|
|
|
|
return $map;
|
|
}
|
|
|
|
private function setVisibleLinesMask($mask) {
|
|
$this->visibleLinesMask = $mask;
|
|
return $this;
|
|
}
|
|
public function getVisibleLinesMask() {
|
|
if ($this->visibleLinesMask === null) {
|
|
throw new Exception(
|
|
'You must generateVisibileLinesMask before accessing this data.'
|
|
);
|
|
}
|
|
return $this->visibleLinesMask;
|
|
}
|
|
|
|
private function setIntraLineDiffs($intra_line_diffs) {
|
|
$this->intraLineDiffs = $intra_line_diffs;
|
|
return $this;
|
|
}
|
|
public function getIntraLineDiffs() {
|
|
if ($this->intraLineDiffs === null) {
|
|
throw new Exception(
|
|
'You must generateIntraLineDiffs before accessing this data.'
|
|
);
|
|
}
|
|
return $this->intraLineDiffs;
|
|
}
|
|
|
|
private function setNewLines($new_lines) {
|
|
$this->newLines = $new_lines;
|
|
return $this;
|
|
}
|
|
public function getNewLines() {
|
|
if ($this->newLines === null) {
|
|
throw new Exception(
|
|
'You must parseHunksForLineData before accessing this data.'
|
|
);
|
|
}
|
|
return $this->newLines;
|
|
}
|
|
|
|
private function setOldLines($old_lines) {
|
|
$this->oldLines = $old_lines;
|
|
return $this;
|
|
}
|
|
public function getOldLines() {
|
|
if ($this->oldLines === null) {
|
|
throw new Exception(
|
|
'You must parseHunksForLineData before accessing this data.'
|
|
);
|
|
}
|
|
return $this->oldLines;
|
|
}
|
|
|
|
public function getOldLineTypeMap() {
|
|
$map = array();
|
|
$old = $this->getOldLines();
|
|
foreach ($old as $o) {
|
|
if (!$o) {
|
|
continue;
|
|
}
|
|
$map[$o['line']] = $o['type'];
|
|
}
|
|
return $map;
|
|
}
|
|
|
|
public function setOldLineTypeMap(array $map) {
|
|
$lines = $this->getOldLines();
|
|
foreach ($lines as $key => $data) {
|
|
$lines[$key]['type'] = $map[$data['line']];
|
|
}
|
|
$this->oldLines = $lines;
|
|
return $this;
|
|
}
|
|
|
|
public function getNewLineTypeMap() {
|
|
$map = array();
|
|
$new = $this->getNewLines();
|
|
foreach ($new as $n) {
|
|
if (!$n) {
|
|
continue;
|
|
}
|
|
$map[$n['line']] = $n['type'];
|
|
}
|
|
return $map;
|
|
}
|
|
|
|
public function setNewLineTypeMap(array $map) {
|
|
$lines = $this->getNewLines();
|
|
foreach ($lines as $key => $data) {
|
|
$lines[$key]['type'] = $map[$data['line']];
|
|
}
|
|
$this->newLines = $lines;
|
|
return $this;
|
|
}
|
|
|
|
|
|
public function setWhitespaceMode($white_space_mode) {
|
|
$this->whitespaceMode = $white_space_mode;
|
|
return $this;
|
|
}
|
|
|
|
private function getWhitespaceMode() {
|
|
if ($this->whitespaceMode === null) {
|
|
throw new Exception(
|
|
'You must setWhitespaceMode before accessing this data.'
|
|
);
|
|
}
|
|
return $this->whitespaceMode;
|
|
}
|
|
|
|
public function getIsDeleted() {
|
|
foreach ($this->getNewLines() as $line) {
|
|
if ($line) {
|
|
// At least one new line, so the entire file wasn't deleted.
|
|
return false;
|
|
}
|
|
}
|
|
|
|
foreach ($this->getOldLines() as $line) {
|
|
if ($line) {
|
|
// No new lines, at least one old line; the entire file was deleted.
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// This is an empty file.
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the hunks change any text, not just whitespace.
|
|
*/
|
|
public function getHasTextChanges() {
|
|
return $this->getHasChanges('text');
|
|
}
|
|
|
|
/**
|
|
* Returns true if the hunks change anything, including whitespace.
|
|
*/
|
|
public function getHasAnyChanges() {
|
|
return $this->getHasChanges('any');
|
|
}
|
|
|
|
private function getHasChanges($filter) {
|
|
if ($filter !== 'any' && $filter !== 'text') {
|
|
throw new Exception("Unknown change filter '{$filter}'.");
|
|
}
|
|
|
|
$old = $this->getOldLines();
|
|
$new = $this->getNewLines();
|
|
|
|
$is_any = ($filter === 'any');
|
|
|
|
foreach ($old as $key => $o) {
|
|
$n = $new[$key];
|
|
if ($o === null || $n === null) {
|
|
// One side is missing, and it's impossible for both sides to be null,
|
|
// so the other side must have something, and thus the two sides are
|
|
// different and the file has been changed under any type of filter.
|
|
return true;
|
|
}
|
|
|
|
if ($o['type'] !== $n['type']) {
|
|
// The types are different, so either the underlying text is actually
|
|
// different or whatever whitespace rules we're using consider them
|
|
// different.
|
|
return true;
|
|
}
|
|
|
|
if ($o['text'] !== $n['text']) {
|
|
if ($is_any) {
|
|
// The text is different, so there's a change.
|
|
return true;
|
|
} else if (trim($o['text']) !== trim($n['text'])) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// No changes anywhere in the file.
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* This function takes advantage of the parsing work done in
|
|
* @{method:parseHunksForLineData} and continues the struggle to hammer this
|
|
* data into something we can display to a user.
|
|
*
|
|
* In particular, this function re-parses the hunks to make them equivalent
|
|
* in length for easy rendering, adding `null` as necessary to pad the
|
|
* length.
|
|
*
|
|
* Anyhoo, this function is not particularly well-named but I try.
|
|
*
|
|
* NOTE: this function must be called after
|
|
* @{method:parseHunksForLineData}.
|
|
*/
|
|
public function reparseHunksForSpecialAttributes() {
|
|
$rebuild_old = array();
|
|
$rebuild_new = array();
|
|
|
|
$old_lines = array_reverse($this->getOldLines());
|
|
$new_lines = array_reverse($this->getNewLines());
|
|
|
|
while (count($old_lines) || count($new_lines)) {
|
|
$old_line_data = array_pop($old_lines);
|
|
$new_line_data = array_pop($new_lines);
|
|
|
|
if ($old_line_data) {
|
|
$o_type = $old_line_data['type'];
|
|
} else {
|
|
$o_type = null;
|
|
}
|
|
|
|
if ($new_line_data) {
|
|
$n_type = $new_line_data['type'];
|
|
} else {
|
|
$n_type = null;
|
|
}
|
|
|
|
if (($o_type != null) && ($n_type == null)) {
|
|
$rebuild_old[] = $old_line_data;
|
|
$rebuild_new[] = null;
|
|
if ($new_line_data) {
|
|
array_push($new_lines, $new_line_data);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (($n_type != null) && ($o_type == null)) {
|
|
$rebuild_old[] = null;
|
|
$rebuild_new[] = $new_line_data;
|
|
if ($old_line_data) {
|
|
array_push($old_lines, $old_line_data);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
$rebuild_old[] = $old_line_data;
|
|
$rebuild_new[] = $new_line_data;
|
|
}
|
|
|
|
$this->setOldLines($rebuild_old);
|
|
$this->setNewLines($rebuild_new);
|
|
|
|
$this->updateChangeTypesForWhitespaceMode();
|
|
|
|
return $this;
|
|
}
|
|
|
|
private function updateChangeTypesForWhitespaceMode() {
|
|
$mode = $this->getWhitespaceMode();
|
|
|
|
$mode_show_all = DifferentialChangesetParser::WHITESPACE_SHOW_ALL;
|
|
if ($mode === $mode_show_all) {
|
|
// If we're showing all whitespace, we don't need to perform any updates.
|
|
return;
|
|
}
|
|
|
|
$mode_trailing = DifferentialChangesetParser::WHITESPACE_IGNORE_TRAILING;
|
|
$is_trailing = ($mode === $mode_trailing);
|
|
|
|
$new = $this->getNewLines();
|
|
$old = $this->getOldLines();
|
|
foreach ($old as $key => $o) {
|
|
$n = $new[$key];
|
|
|
|
if (!$o || !$n) {
|
|
continue;
|
|
}
|
|
|
|
if ($is_trailing) {
|
|
// In "trailing" mode, we need to identify lines which are marked
|
|
// changed but differ only by trailing whitespace. We mark these lines
|
|
// unchanged.
|
|
if ($o['type'] != $n['type']) {
|
|
if (rtrim($o['text']) === rtrim($n['text'])) {
|
|
$old[$key]['type'] = null;
|
|
$new[$key]['type'] = null;
|
|
}
|
|
}
|
|
} else {
|
|
// In "ignore most" and "ignore all" modes, we need to identify lines
|
|
// which are marked unchanged but have internal whitespace changes.
|
|
// We want to ignore leading and trailing whitespace changes only, not
|
|
// internal whitespace changes (`diff` doesn't have a mode for this, so
|
|
// we have to fix it here). If the text is marked unchanged but the
|
|
// old and new text differs by internal space, mark the lines changed.
|
|
if ($o['type'] === null && $n['type'] === null) {
|
|
if ($o['text'] !== $n['text']) {
|
|
if (trim($o['text']) !== trim($n['text'])) {
|
|
$old[$key]['type'] = '-';
|
|
$new[$key]['type'] = '+';
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->setOldLines($old);
|
|
$this->setNewLines($new);
|
|
|
|
return $this;
|
|
}
|
|
|
|
public function generateIntraLineDiffs() {
|
|
$old = $this->getOldLines();
|
|
$new = $this->getNewLines();
|
|
|
|
$diffs = array();
|
|
foreach ($old as $key => $o) {
|
|
$n = $new[$key];
|
|
|
|
if (!$o || !$n) {
|
|
continue;
|
|
}
|
|
|
|
if ($o['type'] != $n['type']) {
|
|
$diffs[$key] = ArcanistDiffUtils::generateIntralineDiff(
|
|
$o['text'],
|
|
$n['text']);
|
|
}
|
|
}
|
|
|
|
$this->setIntraLineDiffs($diffs);
|
|
|
|
return $this;
|
|
}
|
|
|
|
public function generateVisibileLinesMask() {
|
|
$lines_context = DifferentialChangesetParser::LINES_CONTEXT;
|
|
$old = $this->getOldLines();
|
|
$new = $this->getNewLines();
|
|
$max_length = max(count($old), count($new));
|
|
$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']) ||
|
|
(isset($new[$offset]) && $new[$offset]['type'])) {
|
|
$visible = true;
|
|
$last = $offset;
|
|
} else if ($cursor > $last + $lines_context) {
|
|
$visible = false;
|
|
}
|
|
if ($visible && $cursor > 0) {
|
|
$mask[$cursor] = 1;
|
|
}
|
|
}
|
|
|
|
$this->setVisibleLinesMask($mask);
|
|
|
|
return $this;
|
|
}
|
|
|
|
public function getOldCorpus() {
|
|
return $this->getCorpus($this->getOldLines());
|
|
}
|
|
|
|
public function getNewCorpus() {
|
|
return $this->getCorpus($this->getNewLines());
|
|
}
|
|
|
|
private function getCorpus(array $lines) {
|
|
|
|
$corpus = array();
|
|
foreach ($lines as $l) {
|
|
if ($l['type'] != '\\') {
|
|
if ($l['text'] === null) {
|
|
// There's no text on this side of the diff, but insert a placeholder
|
|
// newline so the highlighted line numbers match up.
|
|
$corpus[] = "\n";
|
|
} else {
|
|
$corpus[] = $l['text'];
|
|
}
|
|
}
|
|
}
|
|
return $corpus;
|
|
}
|
|
|
|
public function parseHunksForLineData(array $hunks) {
|
|
assert_instances_of($hunks, 'DifferentialHunk');
|
|
|
|
$old_lines = array();
|
|
$new_lines = array();
|
|
foreach ($hunks as $hunk) {
|
|
|
|
$lines = $hunk->getChanges();
|
|
$lines = phutil_split_lines($lines);
|
|
|
|
$line_type_map = array();
|
|
foreach ($lines as $line_index => $line) {
|
|
if (isset($line[0])) {
|
|
$char = $line[0];
|
|
if ($char == ' ') {
|
|
$line_type_map[$line_index] = null;
|
|
} else {
|
|
$line_type_map[$line_index] = $char;
|
|
}
|
|
} else {
|
|
$line_type_map[$line_index] = null;
|
|
}
|
|
}
|
|
|
|
$old_line = $hunk->getOldOffset();
|
|
$new_line = $hunk->getNewOffset();
|
|
|
|
$num_lines = count($lines);
|
|
for ($cursor = 0; $cursor < $num_lines; $cursor++) {
|
|
$type = $line_type_map[$cursor];
|
|
$data = array(
|
|
'type' => $type,
|
|
'text' => (string)substr($lines[$cursor], 1),
|
|
'line' => $new_line,
|
|
);
|
|
if ($type == '\\') {
|
|
$type = $line_type_map[$cursor - 1];
|
|
$data['text'] = ltrim($data['text']);
|
|
}
|
|
switch ($type) {
|
|
case '+':
|
|
$new_lines[] = $data;
|
|
++$new_line;
|
|
break;
|
|
case '-':
|
|
$data['line'] = $old_line;
|
|
$old_lines[] = $data;
|
|
++$old_line;
|
|
break;
|
|
default:
|
|
$new_lines[] = $data;
|
|
$data['line'] = $old_line;
|
|
$old_lines[] = $data;
|
|
++$new_line;
|
|
++$old_line;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->setOldLines($old_lines);
|
|
$this->setNewLines($new_lines);
|
|
|
|
return $this;
|
|
}
|
|
|
|
public function parseHunksForHighlightMasks(
|
|
array $changeset_hunks,
|
|
array $old_hunks,
|
|
array $new_hunks) {
|
|
assert_instances_of($changeset_hunks, 'DifferentialHunk');
|
|
assert_instances_of($old_hunks, 'DifferentialHunk');
|
|
assert_instances_of($new_hunks, 'DifferentialHunk');
|
|
|
|
// Put changes side by side.
|
|
$olds = array();
|
|
$news = array();
|
|
foreach ($changeset_hunks as $hunk) {
|
|
$n_old = $hunk->getOldOffset();
|
|
$n_new = $hunk->getNewOffset();
|
|
$changes = phutil_split_lines($hunk->getChanges());
|
|
foreach ($changes as $line) {
|
|
$diff_type = $line[0]; // Change type in diff of diffs.
|
|
$orig_type = $line[1]; // Change type in the original diff.
|
|
if ($diff_type == ' ') {
|
|
// Use the same key for lines that are next to each other.
|
|
$key = max(last_key($olds), last_key($news)) + 1;
|
|
$olds[$key] = null;
|
|
$news[$key] = null;
|
|
} else if ($diff_type == '-') {
|
|
$olds[] = array($n_old, $orig_type);
|
|
} else if ($diff_type == '+') {
|
|
$news[] = array($n_new, $orig_type);
|
|
}
|
|
if (($diff_type == '-' || $diff_type == ' ') && $orig_type != '-') {
|
|
$n_old++;
|
|
}
|
|
if (($diff_type == '+' || $diff_type == ' ') && $orig_type != '-') {
|
|
$n_new++;
|
|
}
|
|
}
|
|
}
|
|
|
|
$offsets_old = $this->computeOffsets($old_hunks);
|
|
$offsets_new = $this->computeOffsets($new_hunks);
|
|
|
|
// Highlight lines that were added on each side or removed on the other
|
|
// side.
|
|
$highlight_old = array();
|
|
$highlight_new = array();
|
|
$last = max(last_key($olds), last_key($news));
|
|
for ($i = 0; $i <= $last; $i++) {
|
|
if (isset($olds[$i])) {
|
|
list($n, $type) = $olds[$i];
|
|
if ($type == '+' ||
|
|
($type == ' ' && isset($news[$i]) && $news[$i][1] != ' ')) {
|
|
$highlight_old[] = $offsets_old[$n];
|
|
}
|
|
}
|
|
if (isset($news[$i])) {
|
|
list($n, $type) = $news[$i];
|
|
if ($type == '+' ||
|
|
($type == ' ' && isset($olds[$i]) && $olds[$i][1] != ' ')) {
|
|
$highlight_new[] = $offsets_new[$n];
|
|
}
|
|
}
|
|
}
|
|
|
|
return array($highlight_old, $highlight_new);
|
|
}
|
|
|
|
public function makeContextDiff(
|
|
array $hunks,
|
|
PhabricatorInlineCommentInterface $inline,
|
|
$add_context) {
|
|
|
|
assert_instances_of($hunks, 'DifferentialHunk');
|
|
|
|
$context = array();
|
|
$debug = false;
|
|
if ($debug) {
|
|
$context[] = 'Inline: '.$inline->getIsNewFile().' '.
|
|
$inline->getLineNumber().' '.$inline->getLineLength();
|
|
foreach ($hunks as $hunk) {
|
|
$context[] = 'hunk: '.$hunk->getOldOffset().'-'.
|
|
$hunk->getOldLen().'; '.$hunk->getNewOffset().'-'.$hunk->getNewLen();
|
|
$context[] = $hunk->getChanges();
|
|
}
|
|
}
|
|
|
|
if ($inline->getIsNewFile()) {
|
|
$prefix = '+';
|
|
} else {
|
|
$prefix = '-';
|
|
}
|
|
foreach ($hunks as $hunk) {
|
|
if ($inline->getIsNewFile()) {
|
|
$offset = $hunk->getNewOffset();
|
|
$length = $hunk->getNewLen();
|
|
} else {
|
|
$offset = $hunk->getOldOffset();
|
|
$length = $hunk->getOldLen();
|
|
}
|
|
$start = $inline->getLineNumber() - $offset;
|
|
$end = $start + $inline->getLineLength();
|
|
// We need to go in if $start == $length, because the last line
|
|
// might be a "\No newline at end of file" marker, which we want
|
|
// to show if the additional context is > 0.
|
|
if ($start <= $length && $end >= 0) {
|
|
$start = $start - $add_context;
|
|
$end = $end + $add_context;
|
|
$hunk_content = array();
|
|
$hunk_pos = array( "-" => 0, "+" => 0 );
|
|
$hunk_offset = array( "-" => NULL, "+" => NULL );
|
|
$hunk_last = array( "-" => NULL, "+" => NULL );
|
|
foreach (explode("\n", $hunk->getChanges()) as $line) {
|
|
$in_common = strncmp($line, " ", 1) === 0;
|
|
$in_old = strncmp($line, "-", 1) === 0 || $in_common;
|
|
$in_new = strncmp($line, "+", 1) === 0 || $in_common;
|
|
$in_selected = strncmp($line, $prefix, 1) === 0;
|
|
$skip = !$in_selected && !$in_common;
|
|
if ($hunk_pos[$prefix] <= $end) {
|
|
if ($start <= $hunk_pos[$prefix]) {
|
|
if (!$skip || ($hunk_pos[$prefix] != $start &&
|
|
$hunk_pos[$prefix] != $end)) {
|
|
if ($in_old) {
|
|
if ($hunk_offset["-"] === NULL) {
|
|
$hunk_offset["-"] = $hunk_pos["-"];
|
|
}
|
|
$hunk_last["-"] = $hunk_pos["-"];
|
|
}
|
|
if ($in_new) {
|
|
if ($hunk_offset["+"] === NULL) {
|
|
$hunk_offset["+"] = $hunk_pos["+"];
|
|
}
|
|
$hunk_last["+"] = $hunk_pos["+"];
|
|
}
|
|
|
|
$hunk_content[] = $line;
|
|
}
|
|
}
|
|
if ($in_old) { ++$hunk_pos["-"]; }
|
|
if ($in_new) { ++$hunk_pos["+"]; }
|
|
}
|
|
}
|
|
if ($hunk_offset["-"] !== NULL || $hunk_offset["+"] !== NULL) {
|
|
$header = "@@";
|
|
if ($hunk_offset["-"] !== NULL) {
|
|
$header .= " -" . ($hunk->getOldOffset() + $hunk_offset["-"]) .
|
|
"," . ($hunk_last["-"] - $hunk_offset["-"] + 1);
|
|
}
|
|
if ($hunk_offset["+"] !== NULL) {
|
|
$header .= " +" . ($hunk->getNewOffset() + $hunk_offset["+"]) .
|
|
"," . ($hunk_last["+"] - $hunk_offset["+"] + 1);
|
|
}
|
|
$header .= " @@";
|
|
$context[] = $header;
|
|
$context[] = implode("\n", $hunk_content);
|
|
}
|
|
}
|
|
}
|
|
return implode("\n", $context);
|
|
}
|
|
|
|
private function computeOffsets(array $hunks) {
|
|
assert_instances_of($hunks, 'DifferentialHunk');
|
|
|
|
$offsets = array();
|
|
$n = 1;
|
|
foreach ($hunks as $hunk) {
|
|
for ($i = 0; $i < $hunk->getNewLen(); $i++) {
|
|
$offsets[$n] = $hunk->getNewOffset() + $i;
|
|
$n++;
|
|
}
|
|
}
|
|
return $offsets;
|
|
}
|
|
}
|