54 lines
2.5 KiB
Markdown
54 lines
2.5 KiB
Markdown
[]()
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[](https://www.call-cc.org/)
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[](https://wiki.call-cc.org/eggref/4/edn)
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[](https://liberapay.com/zilti)
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[](https://flattr.com/submit/auto?user_id=zilti&url=https%3A%2F%2Fbitbucket.org%2Fzilti%2Fedn)
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chicken-edn
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===========
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An [EDN](https://github.com/edn-format/edn) reader and writer for R7RS compatible Schemes.
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Installation: `chicken-install edn`
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Data type conversions
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---------------------
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* All kinds of numbers get converted to Scheme numbers, precision suffixes (N and M) get ignored.
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* Keywords :keyword get converted to chicken scheme keywords keyword:.
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* Maps get converted to SRFI 69 hashtables.
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* Vectors are srfi-4 vectors.
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* true = #t, false = #f, nil = '()
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Missing reader functionality
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----------------------------
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Should you notice missing functionality of the reader, plesase use [the issues
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page](https://gitea.lyrion.ch/Chicken/edn/issues) to report it and, if possible, provide a minimal
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test case.
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API
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---
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* Transforming EDN into Scheme: `(read-edn <port>)`
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* Transforming Scheme into EDN: `(write-edn <port> <datastructure>)`
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* Using reader tags: the library contains a parameter `tag-handlers` containing an a-list. 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.
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Releases
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--------
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* **1.0**: Made the custom parsers a parameter.
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* **0.5.2**: Update for Chicken 5
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* **0.5.1**: Small compatibility improvements: "/" now starts a symbol as well, and "," is treated as whitespace.
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* **0.5**: Reader tag support.
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* **0.4**: Complete rewrite. Only relies on R7RS, and SRFI 1, 4, 69 and 88. Uses ports. Reads and writes EDN.
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* **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.
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* **0.2.1**: Can read EDN-files and -strings. EDN tags are not working yet.
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* **0.2**: Can read EDN-strings with one top-level data structure.
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Roadmap
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-------
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About
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-----
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Written by Daniel Ziltener. EDN written by Rich Hickey. The EDN specification is available at [https://github.com/edn-format/edn](https://github.com/edn-format/edn).
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