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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
# tokens
#IGNORE: "[ \f\t]*|#[^\n]*";
#NAME: "[a-zA-Z_][a-zA-Z0-9_]*";
#NUMBER: "(0[xX][0-9a-fA-F]*[lL]?)|(0[0-7]*[lL]?)|([1-9][0-9]*[lL]?)"
#STRING: "\"[^\\\"\n]*\"";
#NEWLINE: "\$\$NEWLINE"
#INDENT: "\$\$INDENT"
#DEDENT: "\$\$DEDENT"
# Start symbols for the grammar:
# single_input is a single interactive statement;
# file_input is a module or sequence of commands read from an input file;
# eval_input is the input for the eval() and input() functions.
# NB: compound_stmt in single_input is followed by extra NEWLINE!
file_input: newline_or_stmt* [EOF];
single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE;
newline_or_stmt: NEWLINE | <stmt>;
eval_input: testlist NEWLINE* EOF;
decorator: "@" dotted_name ( "(" [arglist] ")" )? NEWLINE;
decorators: decorator+;
funcdef: decorators? ["def"] NAME parameters [":"] suite;
parameters: ["("] >varargslist< [")"] | ["("] [")"];
varargslist: (parameter [","])* >star_or_starstarargs< |
parameter ([","] parameter)* [","]?;
parameter: fpdef ("=" test)?;
star_or_starstarargs: starargs [","] starstarargs | starargs | starstarargs;
starargs: ["*"] NAME;
starstarargs: ["**"] NAME;
fpdef: <NAME> | "(" fplist ")";
fplist: fpdef ("," fpdef)* ","?;
stmt: <simple_stmt> | <compound_stmt>;
simple_stmt: small_stmt ([";"] small_stmt)+ [";"]? [NEWLINE] |
<small_stmt> [";"]? [NEWLINE];
small_stmt: <expr_stmt> | <print_stmt> | <del_stmt> |
<pass_stmt> | <flow_stmt> | <import_stmt> | <global_stmt> |
<exec_stmt> | <assert_stmt>;
expr_stmt: <augassign_stmt> | testlist (["="] testlist)*;
augassign_stmt: testlist >augassign< testlist;
augassign: "+=" | "-=" | "*=" | "/=" | "%=" | "&=" | "|=" | "^=" | "<<=" |
">>=" | "**=" | "//=";
# For normal assignments, additional restrictions enforced by the interpreter
print_stmt: ["print"] print_target (([","] test)+ [","]?)? |
["print"] (test ([","] test)* [","]?)?;
print_target: [">>"] test;
del_stmt: ["del"] exprlist;
pass_stmt: ["pass"];
flow_stmt: <break_stmt> | <continue_stmt> | <return_stmt> | <raise_stmt> |
<yield_stmt>;
break_stmt: ["break"];
continue_stmt: ["continue"];
return_stmt: ["return"] testlist?;
yield_stmt: ["yield"] testlist;
raise_stmt: ["raise"] (test ("," test ("," test)?)?)?;
import_stmt: import_name | import_from;
import_name: "import" dotted_as_names;
import_from: "from" dotted_name "import" import_what;
import_what: "*" | "(" import_as_names ","? ")" | import_as_names;
# the second NAME is the "as" (which is not a keyword in Python)
import_as_name: NAME ("as" NAME)?;
dotted_as_name: dotted_name ("as" NAME)?;
import_as_names: import_as_name ("," import_as_name)*;
dotted_as_names: dotted_as_name ("," dotted_as_name)*;
dotted_name: NAME ("." NAME)*;
global_stmt: "global" NAME ("," NAME)*;
exec_stmt: "exec" expr ("in" test ("," test)?)?;
assert_stmt: "assert" test ("," test)?;
compound_stmt: <if_stmt> | <while_stmt> | <for_stmt> | <try_stmt> |
<funcdef> | <classdef>;
if_stmt: "if" test ":" suite ("elif" test ":" suite)* ("else" ":" suite)?;
while_stmt: ["while"] test [":"] suite (["else" ":"] suite)?;
for_stmt: ["for"] exprlist ["in"] testlist [":"] suite (["else" ":"] suite)?;
try_stmt: "try" ":" suite (except_clause ":" suite)+
("else" ":" suite)? | "try" ":" suite "finally" ":" suite;
except_clause: "except" (test ("," test)?)?;
suite: >simple_stmt< | [NEWLINE] [INDENT] stmt+ [DEDENT];
test: and_test "or" test | <and_test> | <lambdef>;
and_test: not_test "and" and_test | <not_test>;
not_test: "not" not_test | <comparison>;
comparison: expr >comp_op< comparison | <expr>;
comp_op: "<" | ">" | "==" | ">=" | "<=" | "<>" | "!=" | "in" | "not" "in" |
"is" "not" | "is";
expr: xor_expr "|" expr | <xor_expr>;
xor_expr: and_expr "^" xor_expr | <and_expr>;
and_expr: shift_expr "&" and_expr | <shift_expr>;
shift_expr: arith_expr ("<<" arith_expr)+ | # was (("<<"|">>") arith_expr)*
arith_expr (">>" arith_expr)+ |
<arith_expr>;
arith_expr: term ("+" term)+ | # was (("+"|"-") term)*
term ("-" term)+ |
<term>;
term: factor ("*" term)+ | # was (("*"|"/"|"%"|"//") factor)*
factor ("/" term)+ |
factor ("%" term)+ |
factor ("//" term)+ |
<factor>;
factor: "+" factor | "-" factor | "~" factor | <power>;
power: atom trailer+ ("**" factor)? | atom "**" factor | <atom>;
atom: "(" testlist_gexp? ")" | <listliteral> | <dictliteral> |
"`" testlist1 "`" | <NAME> | <NUMBER> | STRING+;
listliteral: ["[" "]"] | "[" <listcomprehension> "]" | ["["] >listmaker< ["]"];
listcomprehension: test list_for;
listmaker: test ([","] test)* [","]?;
testlist_gexp: test gen_for |
test ("," test)* ","?;
dictliteral: ["{" "}"] | ["{"] dictitem ([","] dictitem)* [","]? ["}"];
dictitem: test [":"] test;
lambdef: ["lambda"] varargslist? [":"] test;
trailer: <call> | <subscription> | <attraccess>;
call: ["(" ")"] | ["("] arglist [")"];
subscription: ["["] >subscriptlist< ["]"];
attraccess: ["."] NAME;
subscriptlist: subscript ("," subscript)* ","?;
subscript: "." "." "." | test? ":" test? sliceop? | test;
sliceop: ":" test?;
exprlist: expr ("," expr)* ","?;
testlist: test ("," test)* ","?;
testlist_safe: test (("," test)+ ","?)?;
classdef: ["class"] NAME (["("] testlist [")"])? [":"] suite;
arglist: (argument [","])* arglist_rest;
arglist_rest: "*" test ("," "**" test)? | "**" test | argument ","?;
argument: (test "=")? test gen_for?;
list_iter: <list_for> | <list_if>;
list_for: ["for"] exprlist ["in"] testlist_safe list_iter?;
list_if: ["if"] test list_iter?;
gen_iter: <gen_for> | <gen_if>;
gen_for: ["for"] exprlist ["in"] test gen_iter?;
gen_if: ["if"] test gen_iter?;
testlist1: test ("," test)*;
# not used in grammar, but may appear in "node" passed from Parser to Compiler
encoding_decl: NAME;
|
