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:dbpas...@localhost/db")
modparam("auth_db", "db_url", "mysql://user:dbpas...@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
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