chicken-edn

An EDN reader and writer for R7RS compatible Schemes.

Installation: chicken-install edn

Data type conversions

• All kinds of numbers get converted to Scheme numbers, precision suffixes (N and M) get ignored.
• Keywords :keyword get converted to chicken scheme keywords keyword:.
• Maps get converted to SRFI 69 hashtables.
• Vectors are srfi-4 vectors.
• true = #t, false = #f, nil = '()

Missing reader functionality

Should you notice missing functionality of the reader, plesase use the issues page to report it and, if possible, provide a minimal test case.

API

• Transforming EDN into Scheme: (read-edn <port>)
• Transforming Scheme into EDN: (write-edn <port> <datastructure>)
• Using reader tags: the library contains a public a-list tag-handlers. To register a handler, add an a-list entry where the key is the tag without \# and as a keyword, and the value a one-argument procedure.

Releases

• 0.5.2: Update for Chicken 5
• 0.5.1: Small compatibility improvements: "/" now starts a symbol as well, and "," is treated as whitespace.
• 0.5: Reader tag support.
• 0.4: Complete rewrite. Only relies on R7RS, and SRFI 1, 4, 69 and 88. Uses ports. Reads and writes EDN.
• 0.3: EDN tags, including special forms, work. #inst and #uuid both get read as strings. Add nil. Add number prefixes. Add no-space-required to #_ tag.
• 0.2.1: Can read EDN-files and -strings. EDN tags are not working yet.
• 0.2: Can read EDN-strings with one top-level data structure.

Roadmap

About

Written by Daniel Ziltener. EDN written by Rich Hickey. The EDN specification is available at https://github.com/edn-format/edn.