[SR-Users] new features: extended cfg preprocessor directives

[Daniel-Constantin Mierla]

Hello,

On 5/5/10 9:03 PM, Alex Balashov wrote:
> Daniel,
>
> Can values of a preprocessor ID be tested in the preprocessor itself, 
> like #if?

by now there is no #!if, only #!ifdef/#!ifndef which return true/false 
if the ID was defined.

Cheers,
Daniel

>
> Thanks,
>
> -- Alex
>
> On 05/05/2010 02:55 PM, Daniel-Constantin Mierla wrote:
>
>> Hello,
>>
>> just to let you know about some new features related to config
>> preprocessing. 3.0 added config preprocessor directives such as
>> 'include_file' and 'define'. But the define could be used only to
>> control which parts of config file are active.
>>
>> Several days ago I committed the code to allow you 'define' values for
>> IDs, like:
>>
>> #!define MYINT 123
>> #!define MYSTR "xyz"
>>
>> The defined IDs are replaced at startup, during config parsing, e.g.,:
>>
>> $var(x) = 100 + MYINT;
>>
>> - is read as:
>>
>> $var(x) = 100 + 123;
>>
>> Moreover, you can have multi-line defined IDs:
>>
>> #!define IDLOOP $var(i) = 0; \
>> while($var(i)<5) { \
>> xlog("++++ $var(i)\n"); \
>> $var(i) = $var(i) + 1; \
>> }
>>
>> - then in routing block
>>
>> route {
>> ...
>> IDLOOP
>> ...
>> }
>>
>> A completely new thing is the substitution preprocessor directive:
>>
>> #!subst "/regexp/subst/"
>>
>> Defined IDs are not replaced within string values (because a cfg IDs is
>> a standalone alphanumeric token, not enclosed in single or double
>> quotes), so if you need to change something inside a string within
>> config file, then use substitution. For example, if you want to replace
>> the password in all db_url module parameters:
>>
>> #!subst "/DBPASSWD/xyz/"
>>
>> modparam("acc", "db_url", "mysql://user:DBPASSWD@localhost/db")
>> modparam("auth_db", "db_url", "mysql://user:DBPASSWD@localhost/db")
>>
>> The value of a 'subst' directive can be any valid perl-like substitution
>> expression, you can use wildcards, group tokens, backreferences, ....
>>
>> Hope this will make your cfg scripting easier. Testing and feedback is
>> appreciated.
>>
>> Cheers,
>> Daniel
>>
>> -- 
>> Daniel-Constantin Mierla
>> *http://www.asipto.com/
>> *http://twitter.com/miconda
>> *http://www.linkedin.com/in/danielconstantinmierla
>>
>>
>>
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>
>

-- 
Daniel-Constantin Mierla
* http://www.asipto.com/
* http://twitter.com/miconda
* http://www.linkedin.com/in/danielconstantinmierla