Introduces the syntax "%{:<word>:}", borrowed from the <var>'s one, and which
likewise can be embedded anywhere in a string expression (the same reserved
character ':' gets reused in an unambiguous manner).
This allows the two types of expressions (boolean and string) to now share
fully the same language set, namely: strings, lists, vars, regexes, backrefs,
functions with multiple or complex arguments, and especially combinations
thereof.
Most of them were reserved to boolean expressions only, while complex string
constructions can also benefit to, well, strings. The <word> construct allows
that (say the syntax "%{:<word>:}" looks like a temporary variable constructed
in a string).
Since string expressions may now have to deal with lists (arrays), they also
need a way to produce/extract strings from list and vice versa. This can be
done with the new "join" and "split" operators, while the new substitution
regexes (like "s/<pattern>/<substitute>/<flags>") may be used to manipulate
strings in place. All this of course available for both string and boolean
expressions.
Tests and doc updates upcoming..
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1810605 13f79535-47bb-0310-9956-ffa450edef68
* evaluate chains of ||, &&, and string concatenation non-recursively
* limit other types of recursion to 20 levels
* avoid some string copies if concatenating more than 2 strings
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1204087 13f79535-47bb-0310-9956-ffa450edef68
- add possibility to have expressions that evaluate to a string and not to
a boolean value
- modify ap_expr_parse_cmd() interface to support this and make it more
convenient to use in general
- rename AP_EXPR_FLAGS_* to AP_EXPR_FLAG_* for consistency
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1142164 13f79535-47bb-0310-9956-ffa450edef68
- allow lookup function to pre-parse string constant arguments
(used for subnet masks so far)
- various bug fixes for binary operators
- do strdup() for error messages created on the stack to avoid corruption
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1039900 13f79535-47bb-0310-9956-ffa450edef68
- implement regex backreferences and make them available for setting
envvars in SetEnvIfExpr
- implement nested function calls in %-syntax: %{func1:%{func2:arg}}
- actually implement evaluation of concatenation operator (oops...)
- Fix <If ... > treating an internal error as success
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1037504 13f79535-47bb-0310-9956-ffa450edef68
the new parser. Rework ap_expr's public interface and provide hooks for modules
to add variables and functions.
The Netware and Windows build files still need to be adjusted
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1032073 13f79535-47bb-0310-9956-ffa450edef68
