mirror of
https://we.phorge.it/source/phorge.git
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108 lines
3.2 KiB
PHP
108 lines
3.2 KiB
PHP
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<?php
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/*
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* Copyright 2011 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Utility class which encapsulates some shared behavior between different
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* applications which render diffs.
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*
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* @task config Configuring the Engine
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* @task diff Generating Diffs
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*/
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final class PhabricatorDifferenceEngine {
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private $ignoreWhitespace;
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/* -( Configuring the Engine )--------------------------------------------- */
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/**
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* If true, ignore whitespace when computing differences.
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*
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* @param bool Ignore whitespace?
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* @return this
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* @task config
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*/
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public function setIgnoreWhitespace($ignore_whitespace) {
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$this->ignoreWhitespace = $ignore_whitespace;
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return $this;
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}
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/* -( Generating Diffs )--------------------------------------------------- */
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/**
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* Generate an @{class:DifferentialChangeset} from two raw files. This is
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* principally useful because you can feed the output to
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* @{class:DifferentialChangesetParser} in order to render it.
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*
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* @param string Entire previous file content.
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* @param string Entire current file content.
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* @return @{class:DifferentialChangeset} Synthetic changeset.
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* @task diff
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*/
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public function generateChangesetFromFileContent($old, $new) {
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$options = array();
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if ($this->ignoreWhitespace) {
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$options[] = '-bw';
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}
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// Generate diffs with full context.
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$options[] = '-U65535';
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$old_tmp = new TempFile();
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$new_tmp = new TempFile();
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Filesystem::writeFile($old_tmp, $old);
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Filesystem::writeFile($new_tmp, $new);
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list($err, $diff) = exec_manual(
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'/usr/bin/diff %Ls %s %s',
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$options,
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$old_tmp,
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$new_tmp);
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if (!strlen($diff)) {
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// This indicates that the two files are the same (or, possibly, the
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// same modulo whitespace differences, which is why we can't do this
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// check trivially before running `diff`). Build a synthetic, changeless
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// diff so that we can still render the raw, unchanged file instead of
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// being forced to just say "this file didn't change" since we don't have
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// the content.
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$entire_file = explode("\n", $old);
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foreach ($entire_file as $k => $line) {
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$entire_file[$k] = ' '.$line;
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}
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$len = count($entire_file);
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$entire_file = implode("\n", $entire_file);
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// This is a bit hacky but the diff parser can handle it.
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$diff = "--- ignored 9999-99-99\n".
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"+++ ignored 9999-99-99\n".
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"@@ -1,{$len} +1,{$len} @@\n".
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$entire_file."\n";
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}
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$changes = id(new ArcanistDiffParser())->parseDiff($diff);
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$diff = DifferentialDiff::newFromRawChanges($changes);
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return head($diff->getChangesets());
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}
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}
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