mirror of
https://github.com/kanaka/mal.git
synced 2024-09-21 02:27:10 +03:00
96 lines
2.1 KiB
VimL
96 lines
2.1 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 = a:ast.val
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return a:env.get(varname)
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elseif ListQ(a:ast)
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return ListNew(map(copy(a:ast.val), {_, e -> EVAL(e, a:env)}))
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elseif VectorQ(a:ast)
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return VectorNew(map(copy(a:ast.val), {_, e -> EVAL(e, a:env)}))
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elseif HashQ(a:ast)
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let ret = {}
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for [k,v] in items(a:ast.val)
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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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if EmptyQ(a:ast)
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return a:ast
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endif
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let first_symbol = a:ast.val[0].val
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if first_symbol == "def!"
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let a1 = a:ast.val[1]
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let a2 = a:ast.val[2]
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return a:env.set(a1.val, EVAL(a2, a:env))
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elseif first_symbol == "let*"
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let a1 = a:ast.val[1]
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let a2 = a:ast.val[2]
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let let_env = NewEnv(a:env)
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let let_binds = a1.val
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let i = 0
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while i < len(let_binds)
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call let_env.set(let_binds[i].val, 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 = el.val[0]
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return Fn(el.val[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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let repl_env = NewEnv("")
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call repl_env.set("+", {a -> IntegerNew(a[0].val + a[1].val)})
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call repl_env.set("-", {a -> IntegerNew(a[0].val - a[1].val)})
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call repl_env.set("*", {a -> IntegerNew(a[0].val * a[1].val)})
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call repl_env.set("/", {a -> IntegerNew(a[0].val / a[1].val)})
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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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