|Maintainer||Roman Cheplyaka <firstname.lastname@example.org>|
This is a low-level interface to the regex engine.
- data ReObject s r
- compile :: RE s r -> ReObject s r
- emptyObject :: ReObject s r
- data Thread s r
- threads :: ReObject s r -> [Thread s r]
- failed :: ReObject s r -> Bool
- isResult :: Thread s r -> Bool
- getResult :: Thread s r -> Maybe r
- results :: ReObject s r -> [r]
- data ThreadId
- threadId :: Thread s r -> Maybe ThreadId
- step :: s -> ReObject s r -> ReObject s r
- stepThread :: s -> Thread s r -> [Thread s r]
- fromThreads :: [Thread s r] -> ReObject s r
- addThread :: Thread s r -> ReObject s r -> ReObject s r
The state of the engine is represented as a "regex object" of type
ReObject s r
s is the type of symbols and
r is the
result type (as in the
RE type). Think of
ReObject as a collection of
Threads ordered by priority. E.g. threads generated by the left part of
<|> come before the threads generated by the right part.
Compile a regular expression into a regular expression object
A thread either is a result or corresponds to a symbol in the regular expression, which is expected by that thread.
List of all threads of an object. Each non-result thread has a unique id.
Check if the object has no threads. In that case it never will
produce any new threads as a result of
Return the result of a result thread, or
Nothing if it's not a result
Extract the result values from all the result threads of an object
Feed a symbol into a non-result thread. It is an error to call
on a result thread.
Create an object from a list of threads. It is recommended that all
threads come from the same
ReObject, unless you know what you're doing.
However, it should be safe to filter out or rearrange threads.