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Motivation

To add extensibility to the Clojure reader in a composable way.

General Goals

  • new syntax for "tagged" literals in the reader
  • tags can be namespaced
  • non-namespace-qualified tags are reserved for Clojure
  • when the reader encounters a tagged literal, it invokes a function associated with that tag
  • users may define new tags and tag-reader functions
  • users may override functions for built-in tags

Non-goals

  • Common Lisp-style reader macros
  • Custom parsing of the character stream
    • Reader will parse tagged literals as data and pass that to the tag function

References / See Also

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