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
|
# BNF-ish syntax of a Serpent-serialized data string.
expr = single | compound .
single = int | float | complex | string | bool | none .
compound = tuple | dict | list | set .
digit = '0'...'9' .
digitnonzero = '1'...'9' .
int = ['-'] digitnonzero {digit} .
float = pointfloat | exponentfloat .
pointfloat = [int] fraction .
fraction = '.' digit { digit } .
exponentfloat = (int | pointfloat) exponent .
exponent = ("e" | "E") ["+" | "-"] digit { digit } .
complex = complextuple | imaginary .
imaginary = ['+' | '-' ] ( float | int ) 'j' .
complextuple = '(' ( float | int ) imaginary ')' .
string = singlequoted | doublequoted .
singlequoted = '\'' stringvalue_escaped_singlequoted '\'' .
doublequoted = '"' stringvalue_escaped_doublequotes '"' .
bool = 'True' | 'False' .
none = 'None' .
expr_list = expr { ',' expr } trailingcomma .
tuple = tuple_empty | tuple_one | tuple_more
tuple_empty = '()' .
tuple_one = '(' expr ',' <whitespace> ')' .
tuple_more = '(' expr_list ')' .
trailingcomma = '' | ','
list = list_empty | list_nonempty .
list_empty = '[]' .
list_nonempty = '[' expr_list ']' .
set = '{' expr_list '}' .
dict = '{' keyvalue_list '}' .
keyvalue_list = keyvalue { ',' keyvalue } trailingcomma .
keyvalue = expr ':' expr .
|
