python-student-support-code/type_check_Larray.py at main · IUCompilerCourse/python-student-support-code · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
fromastimport*
fromtype_check_LtupimportTypeCheckLtup
fromutilsimport*
importtyping

classTypeCheckLarray(TypeCheckLtup):

defcheck_type_equal(self, t1, t2, e):
match (t1, t2):
case (Bottom(), _): # bounds checking -> exit
pass
case (_, Bottom()):
pass
case (ListType(ty1), ListType(ty2)):
self.check_type_equal(ty1, ty2, e)
case _:
super().check_type_equal(t1, t2, e)

deftype_check_exp(self, e, env):
matche:
caseast.List(es, Load()):
ts= [self.type_check_exp(e, env) foreines]
elt_ty=ts[0]
for (ty, elt) inzip(ts, es):
self.check_type_equal(elt_ty, ty, elt)
e.has_type=ListType(elt_ty)
returne.has_type
caseSubscript(tup, index, Load()):
tup_ty=self.type_check_exp(tup, env)
tup.has_type=tup_ty
index_ty=self.type_check_exp(index, env)
self.check_type_equal(index_ty, IntType(), index)
matchtup_ty:
caseTupleType(ts):
matchindex:
caseConstant(i):
returnts[i]
case _:
raiseException('subscript required constant integer index')
caseListType(ty):
returnty
case _:
raiseException('subscript expected a tuple, not '+repr(tup_ty))
caseCall(Name('len'), [tup]):
tup_t=self.type_check_exp(tup, env)
tup.has_type=tup_t
matchtup_t:
caseTupleType(ts):
returnIntType()
caseListType(ty):
returnIntType()
caseBottom():
returnBottom()
case _:
raiseException('len expected a tuple, not '+repr(tup_t))
caseCall(Name('array_len'), [tup]):
tup_t=self.type_check_exp(tup, env)
tup.has_type=tup_t
matchtup_t:
caseListType(ty):
returnIntType()
caseBottom():
returnBottom()
case _:
raiseException('array_len: unexpected '+repr(tup_t))
caseCall(Name('array_load'), [lst, index]):
lst_ty=self.type_check_exp(lst, env)
index_ty=self.type_check_exp(index, env)
self.check_type_equal(index_ty, IntType(), index)
matchlst_ty:
caseListType(ty):
returnty
case _:
raiseException('array_load: unexpected '+repr(lst_ty))
caseCall(Name('array_store'), [tup, index, value]):
tup_t=self.type_check_exp(tup, env)
value_t=self.type_check_exp(value, env)
index_ty=self.type_check_exp(index, env)
self.check_type_equal(index_ty, IntType(), index)
matchtup_t:
caseListType(ty):
self.check_type_equal(ty, value_t, e)
returnVoidType()
caseBottom():
returnVoidType()
case _:
raiseException('type_check_exp: unexpected '+repr(tup_t))
caseCall(Name('exit'), []):
returnBottom()
caseBinOp(left, Mult(), right):
l=self.type_check_exp(left, env)
self.check_type_equal(l, IntType(), left)
r=self.type_check_exp(right, env)
self.check_type_equal(r, IntType(), right)
returnIntType()
caseAllocateArray(length, typ):
returntyp
case _:
returnsuper().type_check_exp(e, env)

deftype_check_stmts(self, ss, env):
iflen(ss) ==0:
returnVoidType()
matchss[0]:
caseAssign([Subscript(tup, index, Store())], value):
tup_t=self.type_check_exp(tup, env)
tup.has_type=tup_t
value_t=self.type_check_exp(value, env)
index_ty=self.type_check_exp(index, env)
self.check_type_equal(index_ty, IntType(), index)
matchtup_t:
caseTupleType(ts):
matchindex:
caseConstant(i):
if0<=iandi<len(ts):
self.check_type_equal(ts[i], value_t, ss[0])
else:
raiseException('subscript '+str(i) +' not in range of '
+str(tup_t) +' in\n'+str(ss[0]))
case _:
raiseException('subscript required constant integer index')
caseListType(ty):
self.check_type_equal(ty, value_t, ss[0])
caseBottom():
pass
case _:
raiseException('type_check_stmts: expected a list or tuple, not ' \
+repr(tup_t))
returnself.type_check_stmts(ss[1:], env)
case _:
returnsuper().type_check_stmts(ss, env)