77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
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#!/usr/bin/env python
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import re
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from collections import namedtuple
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ASTNode = namedtuple('ASTNode', 'obj type')
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ast_orig = [
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["def","x","int","15"],
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["def","y","int","26"],
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["def","f","function",["l",["c","d"], [["l",["x"],[["def","a","int","12"],["+", "a", "x"], ["+", "a", "c"], ["+", "y", "y"]]]]]]]
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def ast_to_named_tuple(ast_orig):
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obj = []
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if isinstance(ast_orig, list):
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for i in ast_orig:
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obj.append(ast_to_named_tuple(i))
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else:
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obj=ast_orig
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result = ASTNode(obj, None)
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return result
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ast = ast_to_named_tuple(ast_orig)
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def is_var(item):
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return re.match("[a-zA-Z]+", item)
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def variable_check_line(ast,var_dict_box):
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if isinstance(ast,str):
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if is_var(ast):
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if ast in var_dict_box[0][0]:
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pass # OK
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else:
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var_found_frame_index = None
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for i in range(len(var_dict_box)):
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if ast in var_dict_box[i][0] or ast in var_dict_box[i][1]:
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var_found_frame_index = i
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for j in range(var_found_frame_index):
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var_dict_box[j][1].add(ast)
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if var_found_frame_index == None:
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print("找不到變數 %s" % ast)
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else:
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pass
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elif ast[0] == "def":
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if ast[1] in var_dict_box[0][0]:
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raise Exception("The variable is existed")
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elif ast[1] in var_dict_box[0][1]:
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raise Exception("The variable is existed")
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else:
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var_dict_box[0][0].add(ast[1])
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variable_check_line(ast[3],var_dict_box)
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elif ast[0] == "l":
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new_variable_frame = [[set(),set()]]
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for i in ast[1]:
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new_variable_frame[0][0].add(i)
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lambda_var_dict_box = variable_check(ast[2], new_variable_frame + var_dict_box)
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print("lambda 自由變數：", lambda_var_dict_box[0][1].__repr__())
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else:
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for i in ast:
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variable_check_line(i, var_dict_box)
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return var_dict_box
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def variable_check(ast,var_dict_box):
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for i in ast:
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var_dict_box = variable_check_line(i, var_dict_box)
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return var_dict_box
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variable_check(ast,[[set(),set()]])
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