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PhutilXHPASTBinary.php
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Fri, Apr 19, 11:10

PhutilXHPASTBinary.php
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<?php
final class PhutilXHPASTBinary extends Phobject {
/**
* The expected XHPAST version.
*
* This is the version that would be obtained with an up-to-date XHPAST
* build. The //actual// XHPAST build version may vary.
*/
const EXPECTED_VERSION = '7.1.2';
/**
* The XHPAST build version.
*
* Cache the result from @{method:getVersion} to prevent excessive calls to
* @{function:execx}.
*/
private static $version;
/**
* Builds XHPAST automatically.
*
* Attempts to build the XHPAST binary automatically.
*
* @return void
*/
public static function build() {
if (Filesystem::binaryExists('gmake')) {
$command = 'gmake';
} else {
$command = 'make';
}
$root = phutil_get_library_root('phutil');
$path = Filesystem::resolvePath($root.'/../support/xhpast');
// Run the build.
execx(
'%s -C %s %Ls',
$command,
$path,
array('SKIP_PARSER=1', 'SKIP_SCANNER=1', 'clean', 'all', 'install'));
self::$version = null;
// Test the binary.
if (!self::isAvailable()) {
throw new Exception(pht('%s is broken.', 'xhpast'));
}
}
/**
* Returns human-readable instructions for building XHPAST.
*
* @return string
*/
public static function getBuildInstructions() {
$root = phutil_get_library_root('phutil');
$make = Filesystem::resolvePath($root.'/../scripts/build_xhpast.php');
return phutil_console_format(
"%s:\n\n \$ %s\n",
pht(
"Your version of '%s' is unbuilt or out of date. Run this ".
"script to build it.",
'xhpast'),
$make);
}
/**
* Constructs an @{class:ExecFuture} for XHPAST.
*
* @param wild Data to pass to the future.
* @return ExecFuture
*/
public static function getParserFuture($data) {
if (!self::isAvailable()) {
try {
// Try to build XHPAST automatically. If we can't then just ask the
// user to build it themselves.
self::build();
} catch (CommandException $ex) {
throw new PhutilProxyException(self::getBuildInstructions(), $ex);
}
}
$future = new ExecFuture('%s', self::getPath());
$future->write($data);
return $future;
}
/**
* Returns the path to the XHPAST binary.
*
* @return string
*/
public static function getPath() {
if (phutil_is_windows()) {
return dirname(__FILE__).'\\xhpast.exe';
}
return dirname(__FILE__).'/xhpast';
}
/**
* Returns the XHPAST version.
*
* @return string
*/
public static function getVersion() {
if (self::$version === null) {
$bin = self::getPath();
if (Filesystem::pathExists($bin)) {
list($err, $stdout) = exec_manual('%s --version', $bin);
if (!$err) {
self::$version = trim($stdout);
}
}
}
return self::$version;
}
/**
* Checks if XHPAST is built and up-to-date.
*
* @return bool
*/
public static function isAvailable() {
return self::getVersion() == self::EXPECTED_VERSION;
}
}

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