fsm | 易学教程

implementing a state machine using the “yield” keyword

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Is it feasible to use the yield keyword to implement a simple state machine as shown here . To me it looks like the C# compiler has done the hard work for you as it internally implements a state machine to make the yield statement work. Can you piggy-back on top of the work the compiler is already doing and get it to implement most of the state machine for you? Has anyone done this, is it technically possible? It's feasible but it is a bad idea. Iterator blocks were created to help you write custom iterators for collections, not for solving the general-purpose problem of implementing state

Finite State Machine parser

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问题 I would like to parse a self-designed file format with a FSM-like parser in C++ (this is a teach-myself-c++-the-hard-way-by-doing-something-big-and-difficult kind of project :)). I have a tokenized string with newlines signifying the end of a euh... line. See here for an input example. All the comments will and junk is filtered out, so I have a std::string like this: global \n { \n SOURCE_DIRS src \n HEADER_DIRS include \n SOURCES bitwise.c framing.c \n HEADERS ogg/os_types.h ogg/ogg.h \n }

Short example of regular expression converted to a state machine?

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In the Stack Overflow podcast #36 ( http://blog.stackoverflow.com/2009/01/podcast-36/ ), this opinion was expressed: Once you understand how easy it is to set up a state machine, you’ll never try to use a regular expression inappropriately ever again. I've done a bunch of searching. I've found some academic papers and other complicated examples, but I'd like to find a simple example that would help me understand this process. I use a lot of regular expressions, and I'd like to make sure I never use one "inappropriately" ever again. Sure, although you'll need more complicated examples to truly

How to implement a FSM - Finite State Machine in Java

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I have something to do for work and I need your help. We want to implement a FSM - Finite State Machine , to identify char sequence(like: A, B, C, A, C), and tell if it accepted. We think to implement three classes: State , Event and Machine . The state class presents a node in the FSM , we thought to implement it with State design pattern , every node will extend from the abstract class state and every class would handle different types of events and indicate transitions to a new state. Is it good idea in your opinion? Second thing, we don't know how to save all the transitions. Again we

implementing a state machine using the “yield” keyword

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问题 Is it feasible to use the yield keyword to implement a simple state machine as shown here. To me it looks like the C# compiler has done the hard work for you as it internally implements a state machine to make the yield statement work. Can you piggy-back on top of the work the compiler is already doing and get it to implement most of the state machine for you? Has anyone done this, is it technically possible? 回答1: It's feasible but it is a bad idea. Iterator blocks were created to help you

Why is {a^nb^n | n >= 0} not regular?

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问题 In a CS course I'm taking there is an example of a language that is not regular: {a^nb^n | n >= 0} I can understand that it is not regular since no Finite State Automaton/Machine can be written that validates and accepts this input since it lacks a memory component. (Please correct me if I'm wrong) The wikipedia entry on Regular Language also lists this example, but does not provide a (mathematical) proof why it is not regular. Can anyone enlighten me on this and provide proof for this, or

Python state-machine design

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问题 Related to this Stack Overflow question (C state-machine design) , could you Stack Overflow folks share your Python state-machine design techniques with me (and the community)? At the moment, I am going for an engine based on the following: class TrackInfoHandler(object): def __init__(self): self._state="begin" self._acc="" ## ================================== Event callbacks def startElement(self, name, attrs): self._dispatch(("startElement", name, attrs)) def characters(self, ch): self.

How to implement a FSM - Finite State Machine in Java

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问题 I have something to do for work and I need your help. We want to implement a FSM - Finite State Machine , to identify char sequence(like: A, B, C, A, C), and tell if it accepted. We think to implement three classes: State , Event and Machine . The state class presents a node in the FSM , we thought to implement it with State design pattern , every node will extend from the abstract class state and every class would handle different types of events and indicate transitions to a new state. Is