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Request #62164 [PATCH] Add support for alternative try/catch syntax
Submitted: 2012-05-26 06:59 UTC Modified: 2015-03-21 20:36 UTC
Votes:5
Avg. Score:4.4 ± 0.8
Reproduced:2 of 4 (50.0%)
Same Version:1 (50.0%)
Same OS:2 (100.0%)
From: kriss at krizalys dot com Assigned:
Status: Wont fix Package: Scripting Engine problem
PHP Version: 5.4.3 OS: *
Private report: No CVE-ID: None
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 [2012-05-26 06:59 UTC] kriss at krizalys dot com
Description:
------------
The attached patch adds support to alternatively open a try block using a colon (:) in try/catch structures. When using this syntax, each catch block must also be open by a colon, try and catch blocks must not be closed by a closing brace (}), and the whole try/catch structure must be closed by a "endtry" keyword.

The idea is to provide greater readability when PHP code is intermixed with HTML code and keep consistency with constructs like if/endif, for/foreach, etc...

Please, note that after patching, the Zend scanner and parser, as well as ext/tokenizer_data.c should be regenerated (using re2c, bison and tokenizer_data_gen.sh respectively, or using the provided Makefile targets).



Test script:
---------------
<?php
try:
	echo "Trying something unsafe\n";
	throw new Exception('thrown using alternative try/catch syntax');
catch (int $e):
	echo "Caught exception of type int (ints are not throwable, this is just example)\n";
	// several statements can also be used here
catch (Exception $e):
	echo "Caught exception of type Exception: {$e->getMessage()}\n";
	// several statements can also be used here
endtry;
?>
<?php try:?>
<p>Trying something unsafe</p>
<?php throw new Exception('thrown using alternative try/catch syntax');?>
<?php catch (int $e):?>
<p>Caught exception of type int (ints are not throwable, this is just example)</p>
<?php catch (Exception $e):?>
<p>Caught exception of type Exception: <?php echo $e->getMessage();?></p>
<?php endtry;?>

Expected result:
----------------
Trying something unsafe
Caught exception of type Exception: thrown using alternative try/catch syntax
<p>Trying something unsafe</p>
<p>Caught exception of type Exception: thrown using alternative try/catch syntax</p>

Actual result:
--------------
PHP Parse error:  syntax error, unexpected ':', expecting '{' in /home/aaa/test.php on line 2

Parse error: syntax error, unexpected ':', expecting '{' in /home/aaa/test.php on line 2


Patches

php-5.4.3-alt-try-catch.diff (last revision 2012-05-26 07:00 UTC by kriss at krizalys dot com)

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History

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 [2012-05-29 03:17 UTC] kriss at krizalys dot com
I tested the patch successfully on Gentoo x86_64/PHP-5.4.3
 [2015-03-21 20:36 UTC] nikic@php.net
-Status: Open +Status: Wont fix
 [2015-03-21 20:36 UTC] nikic@php.net
Closing as Won't Fix, as I don't think PHP is interested in supporting alternative syntax for more control structures. If you really think this feature is necessary, please submit an RFC (or at least a discussion on the PHP internals mailing list).
 
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