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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -3209,6 +3209,7 @@
'PhabricatorDocumentEngineBlock' => 'applications/files/diff/PhabricatorDocumentEngineBlock.php',
'PhabricatorDocumentEngineBlockDiff' => 'applications/files/diff/PhabricatorDocumentEngineBlockDiff.php',
'PhabricatorDocumentEngineBlocks' => 'applications/files/diff/PhabricatorDocumentEngineBlocks.php',
+ 'PhabricatorDocumentEngineParserException' => 'applications/files/document/exception/PhabricatorDocumentEngineParserException.php',
'PhabricatorDocumentRef' => 'applications/files/document/PhabricatorDocumentRef.php',
'PhabricatorDocumentRenderingEngine' => 'applications/files/document/render/PhabricatorDocumentRenderingEngine.php',
'PhabricatorDoorkeeperApplication' => 'applications/doorkeeper/application/PhabricatorDoorkeeperApplication.php',
@@ -9707,6 +9708,7 @@
'PhabricatorDocumentEngineBlock' => 'Phobject',
'PhabricatorDocumentEngineBlockDiff' => 'Phobject',
'PhabricatorDocumentEngineBlocks' => 'Phobject',
+ 'PhabricatorDocumentEngineParserException' => 'Exception',
'PhabricatorDocumentRef' => 'Phobject',
'PhabricatorDocumentRenderingEngine' => 'Phobject',
'PhabricatorDoorkeeperApplication' => 'PhabricatorApplication',
diff --git a/src/applications/files/document/PhabricatorJSONDocumentEngine.php b/src/applications/files/document/PhabricatorJSONDocumentEngine.php
--- a/src/applications/files/document/PhabricatorJSONDocumentEngine.php
+++ b/src/applications/files/document/PhabricatorJSONDocumentEngine.php
@@ -31,6 +31,17 @@
try {
$data = phutil_json_decode($raw_data);
+ // See T13635. "phutil_json_decode()" always turns JSON into a PHP array,
+ // and we lose the distinction between "{}" and "[]". This distinction is
+ // important when rendering a document.
+ $data = json_decode($raw_data, false);
+ if (!$data) {
+ throw new PhabricatorDocumentEngineParserException(
+ pht(
+ 'Failed to "json_decode(...)" JSON document after successfully '.
+ 'decoding it with "phutil_json_decode(...).'));
+ }
+
if (preg_match('/^\s*\[/', $raw_data)) {
$content = id(new PhutilJSON())->encodeAsList($data);
} else {
@@ -47,6 +58,13 @@
'This document is not valid JSON: %s',
$ex->getMessage()));
+ $content = $raw_data;
+ } catch (PhabricatorDocumentEngineParserException $ex) {
+ $message = $this->newMessage(
+ pht(
+ 'Unable to parse this document as JSON: %s',
+ $ex->getMessage()));
+
$content = $raw_data;
}
diff --git a/src/applications/files/document/exception/PhabricatorDocumentEngineParserException.php b/src/applications/files/document/exception/PhabricatorDocumentEngineParserException.php
new file mode 100644
--- /dev/null
+++ b/src/applications/files/document/exception/PhabricatorDocumentEngineParserException.php
@@ -0,0 +1,4 @@
+<?php
+
+final class PhabricatorDocumentEngineParserException
+ extends Exception {}

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