-
Notifications
You must be signed in to change notification settings - Fork 0
/
symbol_table.py
48 lines (37 loc) · 1.78 KB
/
symbol_table.py
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
from lexer import Token, DATA_TYPES, IDENTIFIER, BOOLEAN_DATA_TYPE, INTEGER_DATA_TYPE, STRING_DATA_TYPE
def generate_symbol_table(tokens: list[Token]):
symbol_table = {}
token_index = 0
next_address = 0
while token_index < len(tokens):
token = tokens[token_index]
if token.type in DATA_TYPES:
token_index += 1
if token_index == len(tokens) or tokens[token_index].type != IDENTIFIER:
raise Exception(
f"Expected a variable name after {token.value} at line {token.line_number}")
data_type = token.value
variable_token = tokens[token_index]
if symbol_table.get(variable_token.value) != None:
raise Exception(
f"Error at line {token.line_number}: variable {variable_token.value} is already declared.")
symbol_table[variable_token.value] = {
"data_type": data_type,
"address": next_address,
"line_of_declaration": token.line_number,
"reference_lines": set(),
"dimensions": 0,
}
if token.type == BOOLEAN_DATA_TYPE:
next_address += 1
elif token.type == INTEGER_DATA_TYPE:
next_address += 4
elif token.type == STRING_DATA_TYPE:
next_address += len(token.value)
elif token.type == IDENTIFIER:
if symbol_table.get(token.value) == None:
raise Exception(
f"Error at line {token.line_number}: variable {token.value} is not declared.")
symbol_table[token.value]["reference_lines"].add(token.line_number)
token_index += 1
return symbol_table