diff options
Diffstat (limited to 'lua/stepA_interop.lua')
| -rwxr-xr-x | lua/stepA_interop.lua | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/lua/stepA_interop.lua b/lua/stepA_interop.lua deleted file mode 100755 index 430fffc..0000000 --- a/lua/stepA_interop.lua +++ /dev/null @@ -1,200 +0,0 @@ -#!/usr/bin/env lua - -local table = require('table') - -local readline = require('readline') -local utils = require('utils') -local types = require('types') -local reader = require('reader') -local printer = require('printer') -local Env = require('env') -local core = require('core') -local List, Vector, HashMap = types.List, types.Vector, types.HashMap - --- read -function READ(str) - return reader.read_str(str) -end - --- eval -function is_pair(x) - return types._sequential_Q(x) and #x > 0 -end - -function quasiquote(ast) - if not is_pair(ast) then - return types.List:new({types.Symbol:new("quote"), ast}) - elseif types._symbol_Q(ast[1]) and ast[1].val == 'unquote' then - return ast[2] - elseif is_pair(ast[1]) and - types._symbol_Q(ast[1][1]) and - ast[1][1].val == 'splice-unquote' then - return types.List:new({types.Symbol:new("concat"), - ast[1][2], - quasiquote(ast:slice(2))}) - else - return types.List:new({types.Symbol:new("cons"), - quasiquote(ast[1]), - quasiquote(ast:slice(2))}) - end -end - -function is_macro_call(ast, env) - if types._list_Q(ast) and - types._symbol_Q(ast[1]) and - env:find(ast[1]) then - local f = env:get(ast[1]) - return types._malfunc_Q(f) and f.ismacro - end -end - -function macroexpand(ast, env) - while is_macro_call(ast, env) do - local mac = env:get(ast[1]) - ast = mac.fn(unpack(ast:slice(2))) - end - return ast -end - -function eval_ast(ast, env) - if types._symbol_Q(ast) then - return env:get(ast) - elseif types._list_Q(ast) then - return List:new(utils.map(function(x) return EVAL(x,env) end,ast)) - elseif types._vector_Q(ast) then - return Vector:new(utils.map(function(x) return EVAL(x,env) end,ast)) - elseif types._hash_map_Q(ast) then - local new_hm = {} - for k,v in pairs(ast) do - new_hm[EVAL(k, env)] = EVAL(v, env) - end - return HashMap:new(new_hm) - else - return ast - end -end - -function EVAL(ast, env) - while true do - --print("EVAL: "..printer._pr_str(ast,true)) - if not types._list_Q(ast) then return eval_ast(ast, env) end - - -- apply list - ast = macroexpand(ast, env) - if not types._list_Q(ast) then return ast end - - local a0,a1,a2,a3 = ast[1], ast[2],ast[3],ast[4] - local a0sym = types._symbol_Q(a0) and a0.val or "" - if 'def!' == a0sym then - return env:set(a1, EVAL(a2, env)) - elseif 'let*' == a0sym then - local let_env = Env:new(env) - for i = 1,#a1,2 do - let_env:set(a1[i], EVAL(a1[i+1], let_env)) - end - env = let_env - ast = a2 -- TCO - elseif 'quote' == a0sym then - return a1 - elseif 'quasiquote' == a0sym then - ast = quasiquote(a1) -- TCO - elseif 'defmacro!' == a0sym then - local mac = EVAL(a2, env) - mac.ismacro = true - return env:set(a1, mac) - elseif 'macroexpand' == a0sym then - return macroexpand(a1, env) - elseif 'try*' == a0sym then - local exc, result = nil, nil - xpcall(function() - result = EVAL(a1, env) - end, function(err) - exc = err - end) - if exc ~= nil then - if types._malexception_Q(exc) then - exc = exc.val - end - if a2 and a2[1].val == 'catch*' then - result = EVAL(a2[3], Env:new(env, {a2[2]}, {exc})) - else - types.throw(exc) - end - end - return result - elseif 'do' == a0sym then - local el = eval_ast(ast:slice(2,#ast-1), env) - ast = ast[#ast] -- TCO - elseif 'if' == a0sym then - local cond = EVAL(a1, env) - if cond == types.Nil or cond == false then - if a3 then ast = a3 else return types.Nil end -- TCO - else - ast = a2 -- TCO - end - elseif 'fn*' == a0sym then - return types.MalFunc:new(function(...) - return EVAL(a2, Env:new(env, a1, arg)) - end, a2, env, a1) - else - local args = eval_ast(ast, env) - local f = table.remove(args, 1) - if types._malfunc_Q(f) then - ast = f.ast - env = Env:new(f.env, f.params, args) -- TCO - else - return f(unpack(args)) - end - end - end -end - --- print -function PRINT(exp) - return printer._pr_str(exp, true) -end - --- repl -local repl_env = Env:new() -function rep(str) - return PRINT(EVAL(READ(str),repl_env)) -end - --- core.lua: defined using Lua -for k,v in pairs(core.ns) do - repl_env:set(types.Symbol:new(k), v) -end -repl_env:set(types.Symbol:new('eval'), - function(ast) return EVAL(ast, repl_env) end) -repl_env:set(types.Symbol:new('*ARGV*'), types.List:new(types.slice(arg,2))) - --- core.mal: defined using mal -rep("(def! *host-language* \"lua\")") -rep("(def! not (fn* (a) (if a false true)))") -rep("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))") -rep("(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))") -rep("(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))") - -function print_exception(exc) - if exc then - if types._malexception_Q(exc) then - exc = printer._pr_str(exc.val, true) - end - print("Error: " .. exc) - print(debug.traceback()) - end -end - -if #arg > 0 then - xpcall(function() rep("(load-file \""..arg[1].."\")") end, - print_exception) - os.exit(0) -end - -rep("(println (str \"Mal [\" *host-language* \"]\"))") -while true do - line = readline.readline("user> ") - if not line then break end - xpcall(function() print(rep(line)) end, - print_exception) -end |