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backup of the joy programming language

a copy of http://www.kevinalbrecht.com/code/joy-mirror/joy.html

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* note that
  the code base is not clean in my view
  thus I do not maintain this implementation
  I just learn from the design of the language

* if you care about the life of joy language
  and you consider the code base hackable
  do a fork and maintain it

* I also play with a joy-like language in js
  here : https://github.com/xieyuheng/sad-coffee

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* dependencies
  joy use the following GC
  https://github.com/ivmai/bdwgc
  I do not use git submodule
  for the repo is too big
  instead the following commit is used
  7aba59b5853330c9368bc16dd606e1617c704334
  I simply include the source code into joy's src directory

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to build the interpreter of joy
just type make

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* joy library
  * usrlib.joy -- personal user library, loaded by default
  * inilib.joy -- the initial library of the joy system
  * the basic libraries
    * agglib.joy -- aggregates: sets, lists, strings
    * seqlib.joy -- sequences: lists, strings with ordering
    * numlib.joy -- numeric: integers, floats
    * symlib.joy -- symbolic manipulation (only translations)
      symtst.joy -- test file
      symtst.out -- output
  * the special libraries
    * mtrlib.joy -- matrices and vectors
      mtrtst.joy -- test file
      mtrtst.out -- output
    * tutlib.joy -- interactive tutorials
      joytut.joy -- an application
      joytut.com -- a (pseudo) input
      joytut.out -- output
    * lazlib.joy -- "lazy" infinite and finite lists
      laztst.joy -- test file
      laztst.out -- output
    * lsplib.joy -- a small (eval-apply) lisp interpreter
      lsplib.lsp -- a small library for this version of lisp
      lsptst.joy
      lsptst.lsp -- input
      lsptst.out -- output
    * plglib.joy -- propositional logic semantic tableaux
      plgtst.joy -- test file
      plgtst.out -- output
    * grmlib.joy -- grammar library (generating and parsing)
      grmtst.joy -- test file
      grmtst.out -- output

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