compiler/pattern

`(match ptrn expr)`

Defined at lib/compiler/pattern.lisp:107:2

Determine whether EXPR matches the provided pattern PTRN, returning nil or a lookup of capture names to captured expressions.

Macro defined at lib/compiler/pattern.lisp:117:2

Create a matcher for the given pattern literal PTRN.

This is intended for views case expressions.

Defined at lib/compiler/pattern.lisp:113:2

Determine whether EXPR matches the provided pattern PTRN.

Macro defined at lib/compiler/pattern.lisp:44:2

Quote the provided pattern PTRN, suitable for matching with i matches?.

This provides several “magic” symbol prefixes to aid matching:

? marks a metavar, and will be captured. If the second character is &, then this will capture zero or more values.
% marks a genvar, which will result in a randomly generated symbol being used in substitutions.
$ marks a fullvar, where one can provide the full name to a variable. Use of this is discouraged and should only be used if you really need to detect hidden symbols.