termenv | Advanced ANSI style & color support | Command Line Interface library
kandi X-RAY | termenv Summary
kandi X-RAY | termenv Summary
termenv lets you safely use advanced styling options on the terminal. It gathers information about the terminal environment in terms of its ANSI & color support and offers you convenient methods to colorize and style your output, without you having to deal with all kinds of weird ANSI escape sequences and color conversions.
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QUESTION
I am trying to build an interpreter for a C-like language in Haskell. I have so far written and combined small monadic parsers following this paper, hence so far I can generate an AST representation of a program. I defined the abstract syntax as follows:
...ANSWER
Answered 2020-Jan-08 at 20:53Addressing your question in the comments about how to proceed with type checking and evaluation.
If you don't have to do inference or polymorphism, type checking is pretty simple. Also type checking and evaluation mirror each other pretty closely in these conditions.
Begin by defining a monad with the features you need. For a type checker, you will need
- A type environment, i.e. a
Reader
(Map Id LangType)
component, to keep track of the types of local variables. - An error ability, e.g.
Except
String
.
So you could define a monad like
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