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ArcanistLintEngine.php
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ArcanistLintEngine.php
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<?php
/*
* Copyright 2011 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.
*/
/**
* Manages lint execution.
*
* @group lint
*/
abstract class ArcanistLintEngine {
protected $workingCopy;
protected $fileData = array();
protected $charToLine = array();
protected $lineToFirstChar = array();
private $results = array();
private $minimumSeverity = null;
private $changedLines = array();
private $commitHookMode = false;
public function __construct() {
}
public function setWorkingCopy(ArcanistWorkingCopyIdentity $working_copy) {
$this->workingCopy = $working_copy;
return $this;
}
public function getWorkingCopy() {
return $this->workingCopy;
}
public function setPaths($paths) {
$this->paths = $paths;
return $this;
}
public function getPaths() {
return $this->paths;
}
public function setPathChangedLines($path, array $changed) {
$this->changedLines[$path] = array_fill_keys($changed, true);
return $this;
}
public function getPathChangedLines($path) {
return idx($this->changedLines, $path);
}
public function setFileData($data) {
$this->fileData = $data + $this->fileData;
return $this;
}
public function setCommitHookMode($mode) {
$this->commitHookMode = $mode;
return $this;
}
protected function loadData($path) {
if (!isset($this->fileData[$path])) {
$disk_path = $this->getFilePathOnDisk($path);
$this->fileData[$path] = Filesystem::readFile($disk_path);
}
return $this->fileData[$path];
}
public function pathExists($path) {
if ($this->getCommitHookMode()) {
return (idx($this->fileData, $path) !== null);
} else {
$disk_path = $this->getFilePathOnDisk($path);
return Filesystem::pathExists($disk_path);
}
}
public function getFilePathOnDisk($path) {
return Filesystem::resolvePath(
$path,
$this->getWorkingCopy()->getProjectRoot());
}
public function setMinimumSeverity($severity) {
$this->minimumSeverity = $severity;
return $this;
}
public function getCommitHookMode() {
return $this->commitHookMode;
}
public function run() {
$stopped = array();
$linters = $this->buildLinters();
if (!$linters) {
throw new ArcanistNoEffectException("No linters to run.");
}
$have_paths = false;
foreach ($linters as $linter) {
if ($linter->getPaths()) {
$have_paths = true;
break;
}
}
if (!$have_paths) {
throw new ArcanistNoEffectException("No paths are lintable.");
}
foreach ($linters as $linter) {
$linter->setEngine($this);
$paths = $linter->getPaths();
foreach ($paths as $key => $path) {
// Make sure each path has a result generated, even if it is empty
// (i.e., the file has no lint messages).
$result = $this->getResultForPath($path);
if (isset($stopped[$path])) {
unset($paths[$key]);
}
}
$paths = array_values($paths);
if ($paths) {
$linter->willLintPaths($paths);
foreach ($paths as $path) {
$linter->willLintPath($path);
$linter->lintPath($path);
if ($linter->didStopAllLinters()) {
$stopped[$path] = true;
}
}
}
$minimum = $this->minimumSeverity;
foreach ($linter->getLintMessages() as $message) {
if (!ArcanistLintSeverity::isAtLeastAsSevere($message, $minimum)) {
continue;
}
// When a user runs "arc diff", we default to raising only warnings on
// lines they have changed (errors are still raised anywhere in the
// file).
$changed = $this->getPathChangedLines($message->getPath());
if ($changed !== null && !$message->isError()) {
if (empty($changed[$message->getLine()])) {
continue;
}
}
$result = $this->getResultForPath($message->getPath());
$result->addMessage($message);
}
}
foreach ($this->results as $path => $result) {
$disk_path = $this->getFilePathOnDisk($path);
$result->setFilePathOnDisk($disk_path);
if (isset($this->fileData[$path])) {
$result->setData($this->fileData[$path]);
} else if ($disk_path && Filesystem::pathExists($disk_path)) {
// TODO: this may cause us to, e.g., load a large binary when we only
// raised an error about its filename. We could refine this by looking
// through the lint messages and doing this load only if any of them
// have original/replacement text or something like that.
$this->fileData[$path] = Filesystem::readFile($path);
$result->setData($this->fileData[$path]);
}
}
return $this->results;
}
abstract protected function buildLinters();
private function getResultForPath($path) {
if (empty($this->results[$path])) {
$result = new ArcanistLintResult();
$result->setPath($path);
$this->results[$path] = $result;
}
return $this->results[$path];
}
public function getLineAndCharFromOffset($path, $offset) {
if (!isset($this->charToLine[$path])) {
$char_to_line = array();
$line_to_first_char = array();
$lines = explode("\n", $this->loadData($path));
$line_number = 0;
$line_start = 0;
foreach ($lines as $line) {
$len = strlen($line) + 1; // Account for "\n".
$line_to_first_char[] = $line_start;
$line_start += $len;
for ($ii = 0; $ii < $len; $ii++) {
$char_to_line[] = $line_number;
}
$line_number++;
}
$this->charToLine[$path] = $char_to_line;
$this->lineToFirstChar[$path] = $line_to_first_char;
}
$line = $this->charToLine[$path][$offset];
$char = $offset - $this->lineToFirstChar[$path][$line];
return array($line, $char);
}
}

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