Diffusion Phabricator (production) Browse

DifferentialHunkParser.php
36e2d02d6ec5production

DifferentialHunkParser.php
View Options

			<?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 PhutilInvalidStateException('generateVisibileLinesMask');
			}
			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 PhutilInvalidStateException('generateIntraLineDiffs');
			}
			return $this->intraLineDiffs;
			}

			private function setNewLines($new_lines) {
			$this->newLines = $new_lines;
			return $this;
			}
			public function getNewLines() {
			if ($this->newLines === null) {
			throw new PhutilInvalidStateException('parseHunksForLineData');
			}
			return $this->newLines;
			}

			private function setOldLines($old_lines) {
			$this->oldLines = $old_lines;
			return $this;
			}
			public function getOldLines() {
			if ($this->oldLines === null) {
			throw new PhutilInvalidStateException('parseHunksForLineData');
			}
			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'] = idx($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'] = idx($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(
			pht(
			'You must %s before accessing this data.',
			'setWhitespaceMode'));
			}
			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(pht("Unknown change filter '%s'.", $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;
			}

			// This line does not exist in the new file.
			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;
			}

			// This line does not exist in the old file.
			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->getSplitLines();

			$line_type_map = array();
			$line_text = array();
			foreach ($lines as $line_index => $line) {
			if (isset($line[0])) {
			$char = $line[0];
			switch ($char) {
			case ' ':
			$line_type_map[$line_index] = null;
			$line_text[$line_index] = substr($line, 1);
			break;
			case "\r":
			case "\n":
			// NOTE: Normally, the first character is a space, plus, minus or
			// backslash, but it may be a newline if it used to be a space and
			// trailing whitespace has been stripped via email transmission or
			// some similar mechanism. In these cases, we essentially pretend
			// the missing space is still there.
			$line_type_map[$line_index] = null;
			$line_text[$line_index] = $line;
			break;
			case '+':
			case '-':
			case '\\':
			$line_type_map[$line_index] = $char;
			$line_text[$line_index] = substr($line, 1);
			break;
			default:
			throw new Exception(
			pht(
			'Unexpected leading character "%s" at line index %s!',
			$char,
			$line_index));
			}
			} else {
			$line_type_map[$line_index] = null;
			$line_text[$line_index] = '';
			}
			}

			$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' => $line_text[$cursor],
			'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();
			$olds_cursor = -1;
			$news_cursor = -1;
			foreach ($changeset_hunks as $hunk) {
			$n_old = $hunk->getOldOffset();
			$n_new = $hunk->getNewOffset();
			$changes = $hunk->getSplitLines();
			foreach ($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.
			if ($olds_cursor > $news_cursor) {
			$key = $olds_cursor + 1;
			} else {
			$key = $news_cursor + 1;
			}
			$olds[$key] = null;
			$news[$key] = null;
			$olds_cursor = $key;
			$news_cursor = $key;
			} else if ($diff_type == '-') {
			$olds[] = array($n_old, $orig_type);
			$olds_cursor++;
			} else if ($diff_type == '+') {
			$news[] = array($n_new, $orig_type);
			$news_cursor++;
			}
			if (($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,
			$is_new,
			$line_number,
			$line_length,
			$add_context) {

			assert_instances_of($hunks, 'DifferentialHunk');

			$context = array();

			if ($is_new) {
			$prefix = '+';
			} else {
			$prefix = '-';
			}

			foreach ($hunks as $hunk) {
			if ($is_new) {
			$offset = $hunk->getNewOffset();
			$length = $hunk->getNewLen();
			} else {
			$offset = $hunk->getOldOffset();
			$length = $hunk->getOldLen();
			}
			$start = $line_number - $offset;
			$end = $start + $line_length;
			// 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) {
			$new_length = $hunk->getNewLen();
			$new_offset = $hunk->getNewOffset();

			for ($i = 0; $i < $new_length; $i++) {
			$offsets[$n] = $new_offset + $i;
			$n++;
			}
			}

			return $offsets;
			}
			}

phab/src/applications/differential/parser/DifferentialHunkParser.php36e2d02d6ec5production

DifferentialHunkParser.phpView Options

phab/src/applications/differential/parser/DifferentialHunkParser.php
36e2d02d6ec5production

DifferentialHunkParser.php
View Options