mirror of
https://github.com/kanaka/mal.git
synced 2024-09-19 09:38:28 +03:00
8a19f60386
- Reorder README to have implementation list after "learning tool" bullet. - This also moves tests/ and libs/ into impls. It would be preferrable to have these directories at the top level. However, this causes difficulties with the wasm implementations which need pre-open directories and have trouble with paths starting with "../../". So in lieu of that, symlink those directories to the top-level. - Move the run_argv_test.sh script into the tests directory for general hygiene.
148 lines
4.4 KiB
Python
148 lines
4.4 KiB
Python
import sys, traceback
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import mal_readline
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import mal_types as types
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from mal_types import (MalSym, MalInt, MalStr,
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nil, true, false, _symbol, _keywordu,
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MalList, _list, MalVector, MalHashMap, MalFunc)
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import reader, printer
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from env import Env
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import core
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# read
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def READ(str):
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return reader.read_str(str)
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# eval
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def eval_ast(ast, env):
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if types._symbol_Q(ast):
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assert isinstance(ast, MalSym)
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return env.get(ast)
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elif types._list_Q(ast):
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res = []
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for a in ast.values:
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res.append(EVAL(a, env))
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return MalList(res)
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elif types._vector_Q(ast):
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res = []
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for a in ast.values:
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res.append(EVAL(a, env))
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return MalVector(res)
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elif types._hash_map_Q(ast):
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new_dct = {}
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for k in ast.dct.keys():
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new_dct[k] = EVAL(ast.dct[k], env)
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return MalHashMap(new_dct)
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else:
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return ast # primitive value, return unchanged
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def EVAL(ast, env):
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while True:
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#print("EVAL %s" % printer._pr_str(ast))
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if not types._list_Q(ast):
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return eval_ast(ast, env)
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# apply list
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if len(ast) == 0: return ast
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a0 = ast[0]
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if isinstance(a0, MalSym):
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a0sym = a0.value
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else:
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a0sym = u"__<*fn*>__"
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if u"def!" == a0sym:
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a1, a2 = ast[1], ast[2]
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res = EVAL(a2, env)
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return env.set(a1, res)
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elif u"let*" == a0sym:
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a1, a2 = ast[1], ast[2]
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let_env = Env(env)
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for i in range(0, len(a1), 2):
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let_env.set(a1[i], EVAL(a1[i+1], let_env))
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ast = a2
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env = let_env # Continue loop (TCO)
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elif u"do" == a0sym:
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if len(ast) == 0:
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return nil
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elif len(ast) > 1:
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eval_ast(ast.slice2(1, len(ast)-1), env)
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ast = ast[-1] # Continue loop (TCO)
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elif u"if" == a0sym:
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a1, a2 = ast[1], ast[2]
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cond = EVAL(a1, env)
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if cond is nil or cond is false:
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if len(ast) > 3: ast = ast[3] # Continue loop (TCO)
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else: return nil
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else:
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ast = a2 # Continue loop (TCO)
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elif u"fn*" == a0sym:
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a1, a2 = ast[1], ast[2]
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return MalFunc(None, a2, env, a1, EVAL)
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else:
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el = eval_ast(ast, env)
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f = el.values[0]
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if isinstance(f, MalFunc):
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if f.ast:
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ast = f.ast
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env = f.gen_env(el.rest()) # Continue loop (TCO)
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else:
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return f.apply(el.rest())
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else:
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raise Exception("%s is not callable" % f)
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# print
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def PRINT(exp):
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return printer._pr_str(exp)
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# repl
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class MalEval(MalFunc):
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def apply(self, args):
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return self.EvalFunc(args[0], self.env)
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def entry_point(argv):
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repl_env = Env()
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def REP(str, env):
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return PRINT(EVAL(READ(str), env))
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# core.py: defined using python
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for k, v in core.ns.items():
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repl_env.set(_symbol(unicode(k)), MalFunc(v))
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repl_env.set(types._symbol(u'eval'),
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MalEval(None, env=repl_env, EvalFunc=EVAL))
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mal_args = []
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if len(argv) >= 3:
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for a in argv[2:]: mal_args.append(MalStr(unicode(a)))
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repl_env.set(_symbol(u'*ARGV*'), MalList(mal_args))
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# core.mal: defined using the language itself
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REP("(def! not (fn* (a) (if a false true)))", repl_env)
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REP("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))", repl_env)
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if len(argv) >= 2:
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REP('(load-file "' + argv[1] + '")', repl_env)
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return 0
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while True:
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try:
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line = mal_readline.readline("user> ")
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if line == "": continue
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print(REP(line, repl_env))
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except EOFError as e:
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break
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except reader.Blank:
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continue
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except types.MalException as e:
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print(u"Error: %s" % printer._pr_str(e.object, False))
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except Exception as e:
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print("Error: %s" % e)
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#print("".join(traceback.format_exception(*sys.exc_info())))
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return 0
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# _____ Define and setup target ___
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def target(*args):
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return entry_point
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# Just run entry_point if not RPython compilation
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import sys
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if not sys.argv[0].endswith('rpython'):
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entry_point(sys.argv)
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