mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
137 lines
3.0 KiB
VimL
137 lines
3.0 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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source core.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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let ast = a:ast
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let env = a:env
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while 1
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if !ListQ(ast)
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return EvalAst(ast, env)
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end
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if EmptyQ(ast)
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return ast
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endif
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let first = ListFirst(ast)
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let first_symbol = SymbolQ(first) ? first.val : ""
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if first_symbol == "def!"
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let a1 = ast.val[1]
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let a2 = ast.val[2]
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let ret = env.set(a1.val, EVAL(a2, env))
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return ret
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elseif first_symbol == "let*"
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let a1 = ast.val[1]
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let a2 = ast.val[2]
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let env = NewEnv(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 env.set(let_binds[i].val, EVAL(let_binds[i+1], env))
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let i = i + 2
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endwhile
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let ast = a2
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" TCO
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elseif first_symbol == "if"
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let condvalue = EVAL(ast.val[1], env)
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if FalseQ(condvalue) || NilQ(condvalue)
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if len(ast.val) < 4
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return g:MalNil
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else
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let ast = ast.val[3]
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endif
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else
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let ast = ast.val[2]
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endif
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" TCO
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elseif first_symbol == "do"
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let astlist = ast.val
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call EvalAst(ListNew(astlist[1:-2]), env)
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let ast = astlist[-1]
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" TCO
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elseif first_symbol == "fn*"
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let fn = NewFn(ListNth(ast, 2), env, ListNth(ast, 1))
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return fn
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else
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" apply list
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let el = EvalAst(ast, env)
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let funcobj = ListFirst(el)
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let args = ListRest(el)
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if NativeFunctionQ(funcobj)
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return NativeFuncInvoke(funcobj, args)
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elseif FunctionQ(funcobj)
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let fn = funcobj.val
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let ast = fn.ast
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let env = NewEnvWithBinds(fn.env, fn.params, args)
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" TCO
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else
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throw "Not a function"
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endif
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endif
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endwhile
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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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set maxfuncdepth=10000
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let repl_env = NewEnv("")
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for [k, v] in items(CoreNs)
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call repl_env.set(k, v)
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endfor
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call REP("(def! not (fn* (a) (if a false true)))", repl_env)
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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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