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Jumping to definitions with M-. is wonderful. The downside — everything has a downside — is that it is all too easy to accidentally edit a source file in the Quicklisp distribution. Here’s what I do. Emacs supports directory-local variables. If you create a file named .dir-locals.el in a directory, Emacs will apply the settings …

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Sometimes you want to write a macro that communicates information to macros inside of its compile-time “scope,” not unlike the way special variables can communicate information to functions inside of another function’s run-time scope. Pre-ANSI Common Lisp actually had a special form for this purpose, compiler-let, but it was removed in ANSI CL, and for …

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Sure, it’s nice to have exhaustiveness checking when dispatching on the type of a single object. But this is Lisp. What about multiple dispatch? Lisp already has a syntax for multiple dispatch: generic functions. Could you layer exhaustiveness checking on top of generic functions? Of course. But while many Lisp types have corresponding built-in classes, …

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Programmers are not to be measured by their ingenuity and their logic but by the completeness of their case analysis. Alan Perlis Let’s start with a simplified definition for etypecase-of (assuming type= from Part I). This looks very similar to ecase-of: In fact ecase-of is, conceptually, a special case of etypecase-of. You could define ecase-of …

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The term exhaustiveness checking comes from functional languages, and programmers experienced with functional languages may feel confused — where are the algebraic data types? In, say, Ocaml, to get exhaustiveness checking, you first have to define an ADT: This superficially resembles the deftype form above, but what it does is very different. The Ocaml defines …

Exhaustiveness checking in Common Lisp, part 1: ecase-of

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The multiple-value-call trick

In Common Lisp it is idiomatic for functions to allow their behavior to be overridden with keyword arguments. So Lispers often write functions whose sole purpose is to call a function that takes keyword arguments, but with different defaults. Since keyword arguments are processed from left to right, and the leftmost occurrence takes precedence, this …

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Suppose you have a parser that reads from a stream, but the stream is missing something. E.g. you have a function that reads a string from a stream, but while the function expects the next character to be a opening quote, the opening quote has already been read from the stream. The obvious solution is …

The Iterate clause trick

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