[jackhill/mal.git] / impls / rpython / stepA_mal.py

import sys
IS_RPYTHON = sys.argv[0].endswith('rpython')

if IS_RPYTHON:
    #from rpython.rlib.debug import fatalerror
    from rpython.rtyper.lltypesystem import lltype
    from rpython.rtyper.lltypesystem.lloperation import llop
else:
    import traceback

import mal_readline
import mal_types as types
from mal_types import (MalSym, MalInt, MalStr,
                       nil, true, false, _symbol, _keywordu,
                       MalList, _list, MalVector, MalHashMap, MalFunc)
import reader, printer
from env import Env
import core

# read
def READ(str):
    return reader.read_str(str)

# eval
def is_pair(x):
    return types._sequential_Q(x) and len(x) > 0

def quasiquote(ast):
    if not is_pair(ast):
        return _list(_symbol(u"quote"), ast)
    else:
        a0 = ast[0]
        if isinstance(a0, MalSym):
            if a0.value == u'unquote':
                return ast[1]
        if is_pair(a0) and isinstance(a0[0], MalSym):
            a00 = a0[0]
            if (isinstance(a00, MalSym) and
                a00.value == u'splice-unquote'):
                return _list(_symbol(u"concat"),
                             a0[1],
                             quasiquote(ast.rest()))
    return _list(_symbol(u"cons"),
                quasiquote(a0),
                quasiquote(ast.rest()))

def is_macro_call(ast, env):
    if types._list_Q(ast):
        a0 = ast[0]
        if isinstance(a0, MalSym):
            if not env.find(a0) is None:
                return env.get(a0).ismacro
    return False

def macroexpand(ast, env):
    while is_macro_call(ast, env):
        assert isinstance(ast[0], MalSym)
        mac = env.get(ast[0])
        ast = macroexpand(mac.apply(ast.rest()), env)
    return ast

def eval_ast(ast, env):
    if types._symbol_Q(ast):
        assert isinstance(ast, MalSym)
        return env.get(ast)
    elif types._list_Q(ast):
        res = []
        for a in ast.values:
            res.append(EVAL(a, env))
        return MalList(res)
    elif types._vector_Q(ast):
        res = []
        for a in ast.values:
            res.append(EVAL(a, env))
        return MalVector(res)
    elif types._hash_map_Q(ast):
        new_dct = {}
        for k in ast.dct.keys():
            new_dct[k] = EVAL(ast.dct[k], env)
        return MalHashMap(new_dct)
    else:
        return ast  # primitive value, return unchanged

def EVAL(ast, env):
    while True:
        #print("EVAL %s" % printer._pr_str(ast))
        if not types._list_Q(ast):
            return eval_ast(ast, env)
        if len(ast) == 0: return ast

        # apply list
        ast = macroexpand(ast, env)
        if not types._list_Q(ast):
            return eval_ast(ast, env)
        if len(ast) == 0: return ast
        a0 = ast[0]
        if isinstance(a0, MalSym):
            a0sym = a0.value
        else:
            a0sym = u"__<*fn*>__"

        if u"def!" == a0sym:
            a1, a2 = ast[1], ast[2]
            res = EVAL(a2, env)
            return env.set(a1, res)
        elif u"let*" == a0sym:
            a1, a2 = ast[1], ast[2]
            let_env = Env(env)
            for i in range(0, len(a1), 2):
                let_env.set(a1[i], EVAL(a1[i+1], let_env))
            ast = a2
            env = let_env # Continue loop (TCO)
        elif u"quote" == a0sym:
            return ast[1]
        elif u"quasiquote" == a0sym:
            ast = quasiquote(ast[1]) # Continue loop (TCO)
        elif u"defmacro!" == a0sym:
            func = EVAL(ast[2], env)
            func.ismacro = True
            return env.set(ast[1], func)
        elif u"macroexpand" == a0sym:
            return macroexpand(ast[1], env)
        elif u"try*" == a0sym:
            if len(ast) < 3:
                return EVAL(ast[1], env);
            a1, a2 = ast[1], ast[2]
            a20 = a2[0]
            if isinstance(a20, MalSym):
                if a20.value == u"catch*":
                    try:
                        return EVAL(a1, env);
                    except types.MalException as exc:
                        exc = exc.object
                        catch_env = Env(env, _list(a2[1]), _list(exc))
                        return EVAL(a2[2], catch_env)
                    except Exception as exc:
                        exc = MalStr(unicode("%s" % exc))
                        catch_env = Env(env, _list(a2[1]), _list(exc))
                        return EVAL(a2[2], catch_env)
            return EVAL(a1, env);
        elif u"do" == a0sym:
            if len(ast) == 0:
                return nil
            elif len(ast) > 1:
                eval_ast(ast.slice2(1, len(ast)-1), env)
            ast = ast[-1] # Continue loop (TCO)
        elif u"if" == a0sym:
            a1, a2 = ast[1], ast[2]
            cond = EVAL(a1, env)
            if cond is nil or cond is false:
                if len(ast) > 3: ast = ast[3] # Continue loop (TCO)
                else:            return nil
            else:
                ast = a2 # Continue loop (TCO)
        elif u"fn*" == a0sym:
            a1, a2 = ast[1], ast[2]
            return MalFunc(None, a2, env, a1, EVAL)
        else:
            el = eval_ast(ast, env)
            f = el.values[0]
            if isinstance(f, MalFunc):
                if f.ast:
                    ast = f.ast
                    env = f.gen_env(el.rest()) # Continue loop (TCO) 
                else:
                    return f.apply(el.rest())
            else:
                raise Exception("%s is not callable" % f)

# print
def PRINT(exp):
    return printer._pr_str(exp)

# repl
class MalEval(MalFunc):
    def apply(self, args):
        return self.EvalFunc(args[0], self.env)

def entry_point(argv):
    repl_env = Env()
    def REP(str, env):
        return PRINT(EVAL(READ(str), env))

    # core.py: defined using python
    for k, v in core.ns.items():
        repl_env.set(_symbol(unicode(k)), MalFunc(v))
    repl_env.set(types._symbol(u'eval'),
                 MalEval(None, env=repl_env, EvalFunc=EVAL))
    mal_args = []
    if len(argv) >= 3:
        for a in argv[2:]: mal_args.append(MalStr(unicode(a)))
    repl_env.set(_symbol(u'*ARGV*'), MalList(mal_args))

    # core.mal: defined using the language itself
    REP("(def! *host-language* \"rpython\")", repl_env)
    REP("(def! not (fn* (a) (if a false true)))", repl_env)
    REP("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))", repl_env)
    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)))))))", repl_env)

    if len(argv) >= 2:
        REP('(load-file "' + argv[1] + '")', repl_env)
        return 0

    REP("(println (str \"Mal [\" *host-language* \"]\"))", repl_env)
    while True:
        try:
            line = mal_readline.readline("user> ")
            if line == "": continue
            print(REP(line, repl_env))
        except EOFError as e:
            break
        except reader.Blank:
            continue
        except types.MalException as e:
            print(u"Error: %s" % printer._pr_str(e.object, False))
        except Exception as e:
            print("Error: %s" % e)
            if IS_RPYTHON:
                llop.debug_print_traceback(lltype.Void)
            else:
                print("".join(traceback.format_exception(*sys.exc_info())))
    return 0

# _____ Define and setup target ___
def target(*args):
    return entry_point

# Just run entry_point if not RPython compilation
import sys
if not sys.argv[0].endswith('rpython'):
    entry_point(sys.argv)
Commit	Line	Data
23fa1b11 JM	1	import sys
	2	IS_RPYTHON = sys.argv[0].endswith('rpython')
	3
	4	if IS_RPYTHON:
	5	#from rpython.rlib.debug import fatalerror
	6	from rpython.rtyper.lltypesystem import lltype
	7	from rpython.rtyper.lltypesystem.lloperation import llop
	8	else:
	9	import traceback
	10
11b4be99 JM	11	import mal_readline
11b4be99 JM	12	import mal_types as types
8855a05a JM	13	from mal_types import (MalSym, MalInt, MalStr,
	14	nil, true, false, _symbol, _keywordu,
	15	MalList, _list, MalVector, MalHashMap, MalFunc)
11b4be99 JM	16	import reader, printer
	17	from env import Env
	18	import core
	19
	20	# read
	21	def READ(str):
	22	return reader.read_str(str)
	23
	24	# eval
	25	def is_pair(x):
	26	return types._sequential_Q(x) and len(x) > 0
	27
	28	def quasiquote(ast):
	29	if not is_pair(ast):
	30	return _list(_symbol(u"quote"), ast)
	31	else:
	32	a0 = ast[0]
	33	if isinstance(a0, MalSym):
	34	if a0.value == u'unquote':
	35	return ast[1]
	36	if is_pair(a0) and isinstance(a0[0], MalSym):
	37	a00 = a0[0]
	38	if (isinstance(a00, MalSym) and
	39	a00.value == u'splice-unquote'):
	40	return _list(_symbol(u"concat"),
	41	a0[1],
	42	quasiquote(ast.rest()))
	43	return _list(_symbol(u"cons"),
	44	quasiquote(a0),
	45	quasiquote(ast.rest()))
	46
	47	def is_macro_call(ast, env):
	48	if types._list_Q(ast):
	49	a0 = ast[0]
	50	if isinstance(a0, MalSym):
	51	if not env.find(a0) is None:
	52	return env.get(a0).ismacro
	53	return False
	54
	55	def macroexpand(ast, env):
	56	while is_macro_call(ast, env):
	57	assert isinstance(ast[0], MalSym)
	58	mac = env.get(ast[0])
	59	ast = macroexpand(mac.apply(ast.rest()), env)
	60	return ast
	61
	62	def eval_ast(ast, env):
	63	if types._symbol_Q(ast):
	64	assert isinstance(ast, MalSym)
	65	return env.get(ast)
	66	elif types._list_Q(ast):
	67	res = []
	68	for a in ast.values:
	69	res.append(EVAL(a, env))
	70	return MalList(res)
8855a05a JM	71	elif types._vector_Q(ast):
	72	res = []
	73	for a in ast.values:
	74	res.append(EVAL(a, env))
	75	return MalVector(res)
	76	elif types._hash_map_Q(ast):
	77	new_dct = {}
	78	for k in ast.dct.keys():
	79	new_dct[k] = EVAL(ast.dct[k], env)
	80	return MalHashMap(new_dct)
11b4be99 JM	81	else:
	82	return ast # primitive value, return unchanged
	83
	84	def EVAL(ast, env):
	85	while True:
	86	#print("EVAL %s" % printer._pr_str(ast))
	87	if not types._list_Q(ast):
	88	return eval_ast(ast, env)
90ca8485	89	if len(ast) == 0: return ast
11b4be99 JM	90
	91	# apply list
	92	ast = macroexpand(ast, env)
44aef1f4 JM	93	if not types._list_Q(ast):
44aef1f4 JM	94	return eval_ast(ast, env)
11b4be99 JM	95	if len(ast) == 0: return ast
	96	a0 = ast[0]
	97	if isinstance(a0, MalSym):
	98	a0sym = a0.value
	99	else:
	100	a0sym = u"__<fn>__"
	101
	102	if u"def!" == a0sym:
	103	a1, a2 = ast[1], ast[2]
	104	res = EVAL(a2, env)
	105	return env.set(a1, res)
	106	elif u"let*" == a0sym:
	107	a1, a2 = ast[1], ast[2]
	108	let_env = Env(env)
	109	for i in range(0, len(a1), 2):
	110	let_env.set(a1[i], EVAL(a1[i+1], let_env))
	111	ast = a2
	112	env = let_env # Continue loop (TCO)
	113	elif u"quote" == a0sym:
	114	return ast[1]
	115	elif u"quasiquote" == a0sym:
	116	ast = quasiquote(ast[1]) # Continue loop (TCO)
	117	elif u"defmacro!" == a0sym:
	118	func = EVAL(ast[2], env)
	119	func.ismacro = True
	120	return env.set(ast[1], func)
	121	elif u"macroexpand" == a0sym:
	122	return macroexpand(ast[1], env)
	123	elif u"try*" == a0sym:
dd7a4f55 JM	124	if len(ast) < 3:
dd7a4f55 JM	125	return EVAL(ast[1], env);
11b4be99 JM	126	a1, a2 = ast[1], ast[2]
	127	a20 = a2[0]
	128	if isinstance(a20, MalSym):
	129	if a20.value == u"catch*":
	130	try:
	131	return EVAL(a1, env);
	132	except types.MalException as exc:
	133	exc = exc.object
	134	catch_env = Env(env, _list(a2[1]), _list(exc))
	135	return EVAL(a2[2], catch_env)
	136	except Exception as exc:
	137	exc = MalStr(unicode("%s" % exc))
	138	catch_env = Env(env, _list(a2[1]), _list(exc))
	139	return EVAL(a2[2], catch_env)
	140	return EVAL(a1, env);
	141	elif u"do" == a0sym:
	142	if len(ast) == 0:
	143	return nil
	144	elif len(ast) > 1:
	145	eval_ast(ast.slice2(1, len(ast)-1), env)
	146	ast = ast[-1] # Continue loop (TCO)
	147	elif u"if" == a0sym:
	148	a1, a2 = ast[1], ast[2]
	149	cond = EVAL(a1, env)
	150	if cond is nil or cond is false:
	151	if len(ast) > 3: ast = ast[3] # Continue loop (TCO)
	152	else: return nil
	153	else:
	154	ast = a2 # Continue loop (TCO)
	155	elif u"fn*" == a0sym:
	156	a1, a2 = ast[1], ast[2]
	157	return MalFunc(None, a2, env, a1, EVAL)
	158	else:
	159	el = eval_ast(ast, env)
	160	f = el.values[0]
	161	if isinstance(f, MalFunc):
	162	if f.ast:
	163	ast = f.ast
	164	env = f.gen_env(el.rest()) # Continue loop (TCO)
	165	else:
	166	return f.apply(el.rest())
	167	else:
	168	raise Exception("%s is not callable" % f)
	169
	170	# print
	171	def PRINT(exp):
	172	return printer._pr_str(exp)
	173
	174	# repl
	175	class MalEval(MalFunc):
	176	def apply(self, args):
	177	return self.EvalFunc(args[0], self.env)
	178
	179	def entry_point(argv):
	180	repl_env = Env()
	181	def REP(str, env):
	182	return PRINT(EVAL(READ(str), env))
	183
	184	# core.py: defined using python
	185	for k, v in core.ns.items():
	186	repl_env.set(_symbol(unicode(k)), MalFunc(v))
	187	repl_env.set(types._symbol(u'eval'),
	188	MalEval(None, env=repl_env, EvalFunc=EVAL))
	189	mal_args = []
190	if len(argv) >= 3:
191	for a in argv[2:]: mal_args.append(MalStr(unicode(a)))
192	repl_env.set(_symbol(u'ARGV'), MalList(mal_args))
193
194	# core.mal: defined using the language itself
7f714804	195	REP("(def! host-language \"rpython\")", repl_env)
11b4be99	196	REP("(def! not (fn* (a) (if a false true)))", repl_env)
e6d41de4	197	REP("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))", repl_env)
11b4be99	198	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)))))))", repl_env)
11b4be99 JM	199
	200	if len(argv) >= 2:
	201	REP('(load-file "' + argv[1] + '")', repl_env)
	202	return 0
	203
	204	REP("(println (str \"Mal [\" host-language \"]\"))", repl_env)
	205	while True:
	206	try:
	207	line = mal_readline.readline("user> ")
	208	if line == "": continue
	209	print(REP(line, repl_env))
	210	except EOFError as e:
	211	break
	212	except reader.Blank:
	213	continue
	214	except types.MalException as e:
	215	print(u"Error: %s" % printer._pr_str(e.object, False))
ab02c5bb JM	216	except Exception as e:
ab02c5bb JM	217	print("Error: %s" % e)
23fa1b11 JM	218	if IS_RPYTHON:
	219	llop.debug_print_traceback(lltype.Void)
	220	else:
	221	print("".join(traceback.format_exception(*sys.exc_info())))
11b4be99 JM	222	return 0
	223
	224	# _____ Define and setup target ___
	225	def target(*args):
	226	return entry_point
	227
	228	# Just run entry_point if not RPython compilation
	229	import sys
	230	if not sys.argv[0].endswith('rpython'):
	231	entry_point(sys.argv)