mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 18:18:51 +03:00
117 lines
2.5 KiB
VimL
117 lines
2.5 KiB
VimL
source readline.vim
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source types.vim
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source reader.vim
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source printer.vim
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source env.vim
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function READ(str)
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return ReadStr(a:str)
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endfunction
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function EvalAst(ast, env)
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if SymbolQ(a:ast)
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let varname = ObjValue(a:ast)
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return a:env.get(varname)
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elseif ListQ(a:ast)
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let ret = []
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for e in ObjValue(a:ast)
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call add(ret, EVAL(e, a:env))
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endfor
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return ListNew(ret)
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elseif VectorQ(a:ast)
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let ret = []
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for e in ObjValue(a:ast)
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call add(ret, EVAL(e, a:env))
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endfor
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return VectorNew(ret)
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elseif HashQ(a:ast)
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let ret = {}
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for [k,v] in items(ObjValue(a:ast))
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let keyobj = HashParseKey(k)
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let newkey = EVAL(keyobj, a:env)
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let newval = EVAL(v, a:env)
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let keystring = HashMakeKey(newkey)
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let ret[keystring] = newval
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endfor
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return HashNew(ret)
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else
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return a:ast
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end
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endfunction
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function EVAL(ast, env)
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if !ListQ(a:ast)
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return EvalAst(a:ast, a:env)
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end
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let first_symbol = ObjValue(ObjValue(a:ast)[0])
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if first_symbol == "def!"
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let a1 = ObjValue(a:ast)[1]
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let a2 = ObjValue(a:ast)[2]
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return a:env.set(ObjValue(a1), EVAL(a2, a:env))
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elseif first_symbol == "let*"
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let a1 = ObjValue(a:ast)[1]
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let a2 = ObjValue(a:ast)[2]
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let let_env = NewEnv(a:env)
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let let_binds = ObjValue(a1)
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let i = 0
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while i < len(let_binds)
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call let_env.set(ObjValue(let_binds[i]), EVAL(let_binds[i+1], let_env))
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let i = i + 2
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endwhile
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return EVAL(a2, let_env)
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else
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" apply list
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let el = EvalAst(a:ast, a:env)
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let Fn = ObjValue(el)[0]
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return Fn(ObjValue(el)[1:-1])
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endif
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endfunction
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function PRINT(exp)
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return PrStr(a:exp, 1)
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endfunction
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function REP(str, env)
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return PRINT(EVAL(READ(a:str), a:env))
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endfunction
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function MalAdd(args)
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return IntegerNew(ObjValue(a:args[0]) + ObjValue(a:args[1]))
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endfunction
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function MalSub(args)
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return IntegerNew(ObjValue(a:args[0]) - ObjValue(a:args[1]))
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endfunction
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function MalMul(args)
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return IntegerNew(ObjValue(a:args[0]) * ObjValue(a:args[1]))
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endfunction
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function MalDiv(args)
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return IntegerNew(ObjValue(a:args[0]) / ObjValue(a:args[1]))
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endfunction
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let repl_env = NewEnv("")
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call repl_env.set("+", function("MalAdd"))
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call repl_env.set("-", function("MalSub"))
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call repl_env.set("*", function("MalMul"))
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call repl_env.set("/", function("MalDiv"))
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while 1
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let [eof, line] = Readline("user> ")
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if eof
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break
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endif
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if line == ""
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continue
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endif
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try
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call PrintLn(REP(line, repl_env))
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catch
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call PrintLn("Error: " . v:exception)
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endtry
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endwhile
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qall!
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