mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
112 lines
3.0 KiB
Python
112 lines
3.0 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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_keywordu,
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MalList, _list, MalVector, MalHashMap, MalFunc)
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import reader, printer
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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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if ast.value in env:
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return env[ast.value]
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else:
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raise Exception(u"'" + ast.value + u"' not found")
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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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#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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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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return f.apply(el.values[1:])
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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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repl_env = {}
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def REP(str, env):
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return PRINT(EVAL(READ(str), env))
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def plus(args):
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a, b = args[0], args[1]
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assert isinstance(a, MalInt)
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assert isinstance(b, MalInt)
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return MalInt(a.value+b.value)
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def minus(args):
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a, b = args[0], args[1]
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assert isinstance(a, MalInt)
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assert isinstance(b, MalInt)
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return MalInt(a.value-b.value)
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def multiply(args):
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a, b = args[0], args[1]
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assert isinstance(a, MalInt)
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assert isinstance(b, MalInt)
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return MalInt(a.value*b.value)
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def divide(args):
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a, b = args[0], args[1]
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assert isinstance(a, MalInt)
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assert isinstance(b, MalInt)
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return MalInt(int(a.value/b.value))
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repl_env[u'+'] = MalFunc(plus)
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repl_env[u'-'] = MalFunc(minus)
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repl_env[u'*'] = MalFunc(multiply)
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repl_env[u'/'] = MalFunc(divide)
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def entry_point(argv):
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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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