xhpast_parse.php
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	<?php

	/**
	* @group xhpast
	*/
	function xhpast_is_available() {
	static $available;
	if ($available === null) {
	$available = false;
	$bin = xhpast_get_binary_path();
	if (Filesystem::pathExists($bin)) {
	list($err, $stdout) = exec_manual('%s --version', $bin);
	if (!$err) {
	$version = trim($stdout);
	if ($version === "xhpast version 0.62") {
	$available = true;
	}
	}
	}
	}
	return $available;
	}


	/**
	* @group xhpast
	*/
	function xhpast_get_binary_path() {
	if (phutil_is_windows()) {
	return dirname(__FILE__).'\\xhpast.exe';
	}
	return dirname(__FILE__).'/xhpast';
	}


	/**
	* @group xhpast
	*/
	function xhpast_get_build_instructions() {
	$root = phutil_get_library_root('phutil');
	$make = $root.'/../scripts/build_xhpast.sh';
	$make = Filesystem::resolvePath($make);
	return <<<EOHELP
	Your version of 'xhpast' is unbuilt or out of date. Run this script to build it:

	\$ {$make}

	EOHELP;
	}


	/**
	* @group xhpast
	*/
	function xhpast_get_parser_future($data) {
	if (!xhpast_is_available()) {
	throw new Exception(xhpast_get_build_instructions());
	}
	$future = new ExecFuture('%s', xhpast_get_binary_path());
	$future->write($data);

	return $future;
	}