mirror of
https://github.com/kanaka/mal.git
synced 2024-09-21 10:37:58 +03:00
80 lines
1.6 KiB
VimL
80 lines
1.6 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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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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if !has_key(a:env, varname)
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throw "'" . varname . "' not found"
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end
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return a:env[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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" 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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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 = {}
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let repl_env["+"] = {a -> IntegerNew(a[0].val + a[1].val)}
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let repl_env["-"] = {a -> IntegerNew(a[0].val - a[1].val)}
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let repl_env["*"] = {a -> IntegerNew(a[0].val * a[1].val)}
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let repl_env["/"] = {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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