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033892777a
See issue #587. * Merge eval-ast and eval into a single conditional. * Expand macros during the apply phase, removing lots of duplicate tests, and increasing the overall consistency by allowing the macro to be computed instead of referenced by name (`((defmacro! cond (...)))` is currently illegal for example). * Print "EVAL: $ast" at the top of EVAL if DEBUG-EVAL exists in the MAL environment. * Remove macroexpand and quasiquoteexpand special forms. * Use pattern-matching style in process/step*.txt. Unresolved issues: c.2: unable to reproduce with gcc 11.12.0. elm: the directory is unchanged. groovy: sometimes fail, but not on each rebuild. nasm: fails some new soft tests, but the issue is unreproducible when running the interpreter manually. objpascal: unreproducible with fpc 3.2.2. ocaml: unreproducible with 4.11.1. perl6: unreproducible with rakudo 2021.09. Unrelated changes: Reduce diff betweens steps. Prevent defmacro! from mutating functions: c forth logo miniMAL vb. dart: fix recent errors and warnings ocaml: remove metadata from symbols. Improve the logo implementation. Encapsulate all representation in types.lg and env.lg, unwrap numbers. Replace some manual iterations with logo control structures. Reduce the diff between steps. Use native iteration in env_get and env_map Rewrite the reader with less temporary strings. Reduce the number of temporary lists (for example, reverse iteration with butlast requires O(n^2) allocations). It seems possible to remove a few exceptions: GC settings (Dockerfile), NO_SELF_HOSTING (IMPLS.yml) and step5_EXCLUDES (Makefile.impls) .
139 lines
3.0 KiB
VimL
139 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 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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let dbgeval = env.get("DEBUG-EVAL")
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if !(empty(dbgeval) || FalseQ(dbgeval) || NilQ(dbgeval))
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call PrintLn("EVAL: " . PrStr(ast, 1))
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endif
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if SymbolQ(ast)
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let varname = ast.val
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let val = env.get(varname)
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if empty(val)
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throw "'" . varname . "' not found"
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endif
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return val
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elseif VectorQ(ast)
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return VectorNew(map(copy(ast.val), {_, e -> EVAL(e, env)}))
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elseif HashQ(ast)
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let ret = {}
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for [k,v] in items(ast.val)
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let newval = EVAL(v, env)
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let ret[k] = newval
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endfor
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return HashNew(ret)
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endif
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if !ListQ(ast)
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return ast
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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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for elt in astlist[1:-2]
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let ignored = EVAL(elt, env)
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endfor
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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 = ListNew(map(copy(ast.val), {_, e -> EVAL(e, 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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