This commit swaps the parameter order in is_direct_member_of
function to have user_id followed by user_group_id since user_id
is a member of user_group_id and not the other way around.
It has always been pretty arbitrary what we did inside
of setup() vs. parse(), and we want to avoid unpredictable
results from other platforms neglecting to call setup().
On my machine you can parse a simple message in about
25 microseconds, based on a trial of a million messages
with the content of "**bold**". Whatever portion of
that time is related to setup-related things like
compiling regexes should be negligible from the user's
perspective, since we never run parse() in a loop.
This gets us closer to having an API that can
be used my mobile.
The parse() function becomes a subset of
apply_markdown() that is no longer coupled
to the shape of a webapp object, and it can
be supplied with a new helper_config for each
invocation. Mobile will likely call this directly.
The setup() function becomes a subset of
initialize() that allows you to set up the
parser **before** having to build any kind of
message-specific helpers. Mobile will likely
call this directly.
The webapp continues to call these functions,
which are now thin wrappers:
* apply_markdown (wrapping parse)
* initialize (wrapping setup)
Note we still have several other problems to
solve before mobile can use this code, but we
introduce this now so that we can get a head
start on prototyping and unit testing.
Also, this commit does not address the fact
that contains_backend_only_syntax() is still
bound to the webapp config.
Sahil Batra
Anders Kaseorg
Steve Howell