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- 06.01.2017
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ClosureCompilerService.php
01 <?php
02
03 /*
04 * @package s9e\TextFormatter
05 * @copyright Copyright (c) 2010-2016 The s9e Authors
06 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
07 */
08 namespace s9e\TextFormatter\Configurator\JavaScript\Minifiers;
09 use RuntimeException;
10 use s9e\TextFormatter\Configurator\JavaScript\OnlineMinifier;
11 class ClosureCompilerService extends OnlineMinifier
12 {
13 public $compilationLevel = 'ADVANCED_OPTIMIZATIONS';
14 public $excludeDefaultExterns = \true;
15 public $externs;
16 public $url = 'http://closure-compiler.appspot.com/compile';
17 public function __construct()
18 {
19 parent::__construct();
20 $this->externs = \file_get_contents(__DIR__ . '/../externs.service.js');
21 }
22 public function getCacheDifferentiator()
23 {
24 $key = array($this->compilationLevel, $this->excludeDefaultExterns);
25 if ($this->excludeDefaultExterns)
26 $key[] = $this->externs;
27 return $key;
28 }
29 public function minify($src)
30 {
31 $body = $this->generateRequestBody($src);
32 $response = $this->query($body);
33 if ($response === \false)
34 throw new RuntimeException('Could not contact the Closure Compiler service');
35 return $this->decodeResponse($response);
36 }
37 protected function decodeResponse($response)
38 {
39 $response = \json_decode($response, \true);
40 if (\is_null($response))
41 {
42 $msgs = array(
43 \JSON_ERROR_NONE => 'No error',
44 \JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
45 \JSON_ERROR_STATE_MISMATCH => 'State mismatch (invalid or malformed JSON)',
46 \JSON_ERROR_CTRL_CHAR => 'Control character error, possibly incorrectly encoded',
47 \JSON_ERROR_SYNTAX => 'Syntax error',
48 \JSON_ERROR_UTF8 => 'Malformed UTF-8 characters, possibly incorrectly encoded'
49 );
50 throw new RuntimeException('Closure Compiler service returned invalid JSON: ' . (isset($msgs[\json_last_error()]) ? $msgs[\json_last_error()] : 'Unknown error'));
51 }
52 if (isset($response['serverErrors'][0]))
53 {
54 $error = $response['serverErrors'][0];
55 throw new RuntimeException('Server error ' . $error['code'] . ': ' . $error['error']);
56 }
57 if (isset($response['errors'][0]))
58 {
59 $error = $response['errors'][0];
60 throw new RuntimeException('Compilation error: ' . $error['error']);
61 }
62 return $response['compiledCode'];
63 }
64 protected function generateRequestBody($src)
65 {
66 $params = array(
67 'compilation_level' => $this->compilationLevel,
68 'js_code' => $src,
69 'output_format' => 'json',
70 'output_info' => 'compiled_code'
71 );
72 if ($this->excludeDefaultExterns && $this->compilationLevel === 'ADVANCED_OPTIMIZATIONS')
73 {
74 $params['exclude_default_externs'] = 'true';
75 $params['js_externs'] = $this->externs;
76 }
77 $body = \http_build_query($params) . '&output_info=errors';
78 return $body;
79 }
80 protected function query($body)
81 {
82 return $this->httpClient->post(
83 $this->url,
84 array('Content-Type: application/x-www-form-urlencoded'),
85 $body
86 );
87 }
88 }