Finite state automata8/22/2023 ![]() For example, when you get to parsing you might ask "Do I need to know about top-down and bottom-up parsing". You need to know a lot of theory about a lot of other things, and you could eventually ask about them too. What you have asked: " Do I need to understand more than this to write a compiler?" then answer is basically, No - but it does depend on the compiler! My question is this: Do I need to understand more than this to write a Compiler? Is there something unique about FSA that I'm just completely missing? Or is this just an over complication of a simple concept in regards to creating a compiler? Problem is that in every chapter of finite state automata I have to go over 50 pages of rigorous notation, differences between non-deterministic and deterministic finite state automata (including separate notation where Epsilon is three different things based on its styling) and a dozen or more of these graphs: If you were to tell me that the point of FSA within a compiler is for Lexical Analysis and that its purpose therein is just to go character by character and determine whether or not a word is an identifier, keyword, or other token, I would be completely confident in my understanding. What I don't understand is why in the world this theory is regurgitated in such an obscenely convoluted way? I understand the idea of moving from state to state and having a state that is accepted. Transitions − The machine moves from one state to another and is indicated as transition.I've read up on Finite State Automata in a lot of different books on compiler construction (two of which are actually called Compiler Construction) and I'm kind of at a loss. Accepting states are usually drawn as a double circle as shown below − Initial states are usually drawn with an arrow pointed to state, as shown below −įinal state − It is a subset of known states that indicates whether the input we processed is valid or not. Initial State − It is the starting point of our system. State − The states are usually drawn with circles and only one state can be active at a time. The components which exists in a finite state machine are explained below −
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