mirror of
https://github.com/kanaka/mal.git
synced 2024-11-10 12:47:45 +03:00
133 lines
3.8 KiB
Python
133 lines
3.8 KiB
Python
import sys, 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 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)
|
|
|
|
# apply list
|
|
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"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
|
|
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))
|
|
|
|
# core.mal: defined using the language itself
|
|
REP("(def! not (fn* (a) (if a false true)))", 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)
|
|
#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)
|