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Provide some "preg_*" wrappers which raise exceptions on failure
Summary: Ref T13608. Ref T13100. Ref T13586. Properly checking "preg_match()" and similar calls for failure and raising useful exceptions is complicated and error-prone. Provide wrapper functions with an API that's more consistent with the rest of the codebase: matches are returned; and errors raise detailed exceptions. Test Plan: See next change. Maniphest Tasks: T13608, T13586, T13100 Differential Revision: https://secure.phabricator.com/D21561
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3 changed files with 94 additions and 0 deletions
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@ -849,6 +849,7 @@ phutil_register_library_map(array(
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'PhutilRawEnglishLocale' => 'internationalization/locales/PhutilRawEnglishLocale.php',
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'PhutilReadableSerializer' => 'readableserializer/PhutilReadableSerializer.php',
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'PhutilReadableSerializerTestCase' => 'readableserializer/__tests__/PhutilReadableSerializerTestCase.php',
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'PhutilRegexException' => 'exception/PhutilRegexException.php',
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'PhutilRope' => 'utils/PhutilRope.php',
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'PhutilRopeTestCase' => 'utils/__tests__/PhutilRopeTestCase.php',
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'PhutilServiceProfiler' => 'serviceprofiler/PhutilServiceProfiler.php',
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@ -1009,6 +1010,9 @@ phutil_register_library_map(array(
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'phutil_partition' => 'utils/utils.php',
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'phutil_passthru' => 'future/exec/execx.php',
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'phutil_person' => 'internationalization/pht.php',
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'phutil_preg_match' => 'utils/utils.php',
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'phutil_preg_match_all' => 'utils/utils.php',
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'phutil_raise_preg_exception' => 'utils/utils.php',
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'phutil_register_library' => 'init/lib/core.php',
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'phutil_register_library_map' => 'init/lib/core.php',
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'phutil_set_system_locale' => 'utils/utf8.php',
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@ -1925,6 +1929,7 @@ phutil_register_library_map(array(
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'PhutilRawEnglishLocale' => 'PhutilLocale',
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'PhutilReadableSerializer' => 'Phobject',
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'PhutilReadableSerializerTestCase' => 'PhutilTestCase',
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'PhutilRegexException' => 'Exception',
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'PhutilRope' => 'Phobject',
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'PhutilRopeTestCase' => 'PhutilTestCase',
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'PhutilServiceProfiler' => 'Phobject',
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3
src/exception/PhutilRegexException.php
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3
src/exception/PhutilRegexException.php
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@ -0,0 +1,3 @@
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<?php
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final class PhutilRegexException extends Exception {}
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@ -2008,3 +2008,89 @@ function phutil_partition(array $map) {
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return $partitions;
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}
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function phutil_preg_match(
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$pattern,
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$subject,
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$flags = 0,
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$offset = 0) {
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$matches = null;
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$result = @preg_match($pattern, $subject, $matches, $flags, $offset);
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if ($result === false || $result === null) {
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phutil_raise_preg_exception(
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'preg_match',
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array(
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$pattern,
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$subject,
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$matches,
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$flags,
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$offset,
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));
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}
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return $matches;
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}
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function phutil_preg_match_all(
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$pattern,
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$subject,
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$flags = 0,
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$offset = 0) {
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$matches = null;
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$result = @preg_match_all($pattern, $subject, $matches, $flags, $offset);
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if ($result === false || $result === null) {
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phutil_raise_preg_exception(
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'preg_match_all',
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array(
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$pattern,
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$subject,
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$matches,
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$flags,
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$offset,
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));
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}
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return $matches;
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}
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function phutil_raise_preg_exception($function, array $argv) {
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$trap = new PhutilErrorTrap();
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// NOTE: This ugly construction to avoid issues with reference behavior when
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// passing values through "call_user_func_array()".
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switch ($function) {
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case 'preg_match':
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@preg_match($argv[0], $argv[1], $argv[2], $argv[3], $argv[4]);
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break;
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case 'preg_match_all':
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@preg_match_all($argv[0], $argv[1], $argv[2], $argv[3], $argv[4]);
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break;
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}
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$error_message = $trap->getErrorsAsString();
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$trap->destroy();
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$pattern = $argv[0];
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$pattern_display = sprintf(
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'"%s"',
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addcslashes($pattern, '\\\"'));
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$message = array();
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$message[] = pht(
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'Call to %s(%s, ...) failed.',
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$function,
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$pattern_display);
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if (strlen($error_message)) {
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$message[] = pht(
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'Regular expression engine emitted message: %s',
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$error_message);
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}
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$message = implode("\n\n", $message);
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throw new PhutilRegexException($message);
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}
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