Posts in Castle

FSM syntax, an evaluation

As described in FSMs are needed Finit State Machines are great and needed – even tough no (main) programming language has syntax support for it. But there are other (computer) language that (more-or-less) support the corresponding State pattern.
By example plantUML –very populair by mature developers– has a syntax to draw them.

What can we learn from them? That is the topic of this post, before we define the Castle syntax.

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FSMs are needed

Finit State Machines (FSMs) are great to model behaviour and control flow. Probably it is one of the most used design patterns; some developers are not even aware they are using it (when using the State pattern). And non of the well-known system-programming-languages does support it directly – it’s a shame;-)

This leads to sub-optimal, often hard to maintain code. In Castle, you can use define a FSM directly. Let’s see why that is essential.

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No inline actions

In Grammar is code we have mentioned that many compiler-compilers reuse the Yacc invention “actions”. And we hinted already that Castle prefers an alternative.

Let’s see why the old concept is outdated … And what is easier to use.

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Grammar is code

In Compiler Compiler we have seen that we can define a grammar within a Castle-program. And we have argued that each grammars-rule can be considered as a function.

In this post, we look into de details of how this works. And will confirm grammars is code …

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Compiler Compiler

In Castle you can define a grammar directly in your code. The compiler will translate them into functions, using the build-in (PEG) compiler-compiler – at least that was it called back in the days of YACC.

How does one use that? And why should you?

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