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phab/src/applications/differential/storage/hunk/DifferentialHunk.php
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DifferentialHunk.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
final class DifferentialHunk extends DifferentialDAO {
protected $changesetID;
protected $changes;
protected $oldOffset;
protected $oldLen;
protected $newOffset;
protected $newLen;
public function getAddedLines() {
$lines = array();
$n = $this->newOffset;
foreach (explode("\n", $this->changes) as $diff_line) {
if ($diff_line == '' || $diff_line[0] == '\\') {
continue;
}
if ($diff_line[0] == '+') {
$lines[$n] = (string)substr($diff_line, 1); // substr('+', 1) === false
}
if ($diff_line[0] != '-') {
$n++;
}
}
return $lines;
}
public function makeNewFile() {
return $this->makeContent($exclude = '-');
}
public function makeOldFile() {
return $this->makeContent($exclude = '+');
}
public function makeChanges() {
return $this->makeContent($exclude = ' ');
}
final private function makeContent($exclude) {
$results = array();
$lines = explode("\n", $this->changes);
// NOTE: To determine whether the recomposed file should have a trailing
// newline, we look for a "\ No newline at end of file" line which appears
// after a line which we don't exclude. For example, if we're constructing
// the "new" side of a diff (excluding "-"), we want to ignore this one:
//
// - x
// \ No newline at end of file
// + x
//
// ...since it's talking about the "old" side of the diff, but interpret
// this as meaning we should omit the newline:
//
// - x
// + x
// \ No newline at end of file
$use_next_newline = false;
$has_newline = true;
foreach ($lines as $line) {
if (isset($line[0])) {
if ($line[0] == $exclude) {
$use_next_newline = false;
continue;
}
if ($line[0] == '\\') {
if ($use_next_newline) {
$has_newline = false;
}
continue;
}
}
$use_next_newline = true;
$results[] = substr($line, 1);
}
$possible_newline = '';
if ($has_newline) {
$possible_newline = "\n";
}
return implode("\n", $results).$possible_newline;
}
}
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