[Refac] Refac the fsm.cc, fsm_builder.cc and the tests. #3
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At present, the FSM class can only build a FSM from a string. This PR
offers a basic RegexToFSM function.
These regex grammars are supported:
- Strings. For instance, `RegexToFSM("abc")` will build a FSM to accept
"abc".
- Character classes. For instance, `RegexToFSM("[a-z]")` will build a
FSM to accept characters from 'a' to 'z'.
- Repeatation(`*`, `+`, `?`, `{m}`, `{m, n}`).
- Union. (`|`).
Moreover, some basic optimization algorithms are implemented, which can
help to simplify the state machine:
- `ToDFA()`.(Powerset construction)
- `MinimizeDFA()`(Hopcraft Algorithm).
- `SimplifyTransition()`(Xgrammar node merging, type I)
- `SimplifyEpsilon()`(Xgrammar node merging, type II)
---------
Co-authored-by: Yixin Dong <[email protected]>
This reverts commit 11c2994.
…g-dispatch' into dev/5.26/enhance_tag_dispatch
Owner
|
Thanks! @Seven-Streams |
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In this PR:
AddFSMandSimplifyEpsilon