mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
248a50c168
* dosmodule.c: MSDOS specific stuff from posixmodule.c. * posixmodule.c: removed all MSDOS specific stuff. * tokenizer.h, parsetok.h: in prototypes, don't mix named and unnamed parameters (MSC doesn't like this).
147 lines
5.1 KiB
Plaintext
147 lines
5.1 KiB
Plaintext
# Grammar for Python
|
|
|
|
# Change log:
|
|
|
|
# 30-Nov-93:
|
|
# Removed lambda_input, added lambdef
|
|
|
|
# 25-Oct-93:
|
|
# Added lambda_input
|
|
|
|
# 18-Oct-93:
|
|
# Use testlist instead of exprlist in expr_stmt
|
|
# Add exec statement
|
|
|
|
# 19-May-93:
|
|
# Add access statement
|
|
|
|
# 18-May-93:
|
|
# Abolish old class header syntax
|
|
|
|
# 06-Apr-92:
|
|
# Use only '*' for varargs list
|
|
|
|
# 31-Mar-92:
|
|
# Tighten syntax for try statements
|
|
|
|
# 27-Feb-92:
|
|
# Allow NEWLINE* after eval input
|
|
|
|
# 16-Jan-92:
|
|
# Added '*' as alternative for '+' in varargs syntax
|
|
# (Not sure which alternative is better yet.)
|
|
|
|
# 11-Jan-92:
|
|
# Variable length argument list syntax added: def f(a, b, +rest): ...
|
|
|
|
# 8-Jan-92:
|
|
# Allow only '==' for equality testing
|
|
|
|
# Changes since version 8:
|
|
# Trailing commas in formal parameter lists are allowed
|
|
|
|
# Changes since version 7:
|
|
# New syntax to specify base classes (but old syntax retained for now)
|
|
# 'global' statement (valid only in functions but not enforced here)
|
|
|
|
# Changes since version 6:
|
|
# Add logical operators '|', '^', '&' and '~'
|
|
# Add shift operators '<<' and '>>'
|
|
|
|
# Changes since version 5:
|
|
# Comparison operators '<=' '>' '<>' are now 1 token
|
|
# Also support '!=' and '==' as alternatives for '<>' and '='
|
|
|
|
# Changes compared to version 4:
|
|
# Blank lines and lines only containing a comment are now eaten
|
|
# by the lexer, so the NEWLINE* things in suite are gone
|
|
# (but the 2nd NEWLINE terminating single_input stays!)
|
|
# Semicolons can separate small statements
|
|
# 'continue' statement
|
|
# Dictionary constructors: {key:value, key:value, ...}
|
|
# More tests instead of exprs
|
|
|
|
# Changes compared to version 3:
|
|
# Removed 'dir' statement.
|
|
# Function call argument is a testlist instead of exprlist.
|
|
|
|
# Changes compared to version 2:
|
|
# The syntax of Boolean operations is changed to use more
|
|
# conventional priorities: or < and < not.
|
|
|
|
# Changes compared to version 1:
|
|
# modules and scripts are unified;
|
|
# 'quit' is gone (use ^D);
|
|
# empty_stmt is gone, replaced by explicit NEWLINE where appropriate;
|
|
# 'import' and 'def' aren't special any more;
|
|
# added 'from' NAME option on import clause, and '*' to import all;
|
|
# added class definition.
|
|
|
|
# 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!
|
|
single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
|
|
file_input: (NEWLINE | stmt)* ENDMARKER
|
|
eval_input: testlist NEWLINE* ENDMARKER
|
|
|
|
funcdef: 'def' NAME parameters ':' suite
|
|
parameters: '(' [varargslist] ')'
|
|
varargslist: (fpdef ',')* '*' NAME | fpdef (',' fpdef)* [',']
|
|
fpdef: NAME | '(' fplist ')'
|
|
fplist: fpdef (',' fpdef)* [',']
|
|
|
|
stmt: simple_stmt | compound_stmt
|
|
simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
|
|
small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | access_stmt | exec_stmt
|
|
expr_stmt: (testlist '=')* testlist
|
|
# For assignments, additional restrictions enforced by the interpreter
|
|
print_stmt: 'print' (test ',')* [test]
|
|
del_stmt: 'del' exprlist
|
|
pass_stmt: 'pass'
|
|
flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt
|
|
break_stmt: 'break'
|
|
continue_stmt: 'continue'
|
|
return_stmt: 'return' [testlist]
|
|
raise_stmt: 'raise' test [',' test]
|
|
import_stmt: 'import' NAME (',' NAME)* | 'from' NAME 'import' ('*' | NAME (',' NAME)*)
|
|
global_stmt: 'global' NAME (',' NAME)*
|
|
access_stmt: 'access' ('*' | NAME (',' NAME)*) ':' accesstype (',' accesstype)*
|
|
accesstype: NAME+
|
|
# accesstype should be ('public' | 'protected' | 'private') ['read'] ['write']
|
|
# but can't be because that would create undesirable reserved words!
|
|
exec_stmt: 'exec' expr ['in' 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)+ | 'try' ':' suite 'finally' ':' suite
|
|
# NB compile.c makes sure that the default except clause is last
|
|
except_clause: 'except' [test [',' test]]
|
|
suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT
|
|
|
|
test: and_test ('or' and_test)* | lambdef
|
|
and_test: not_test ('and' not_test)*
|
|
not_test: 'not' not_test | comparison
|
|
comparison: expr (comp_op expr)*
|
|
comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
|
|
expr: xor_expr ('|' xor_expr)*
|
|
xor_expr: and_expr ('^' and_expr)*
|
|
and_expr: shift_expr ('&' shift_expr)*
|
|
shift_expr: arith_expr (('<<'|'>>') arith_expr)*
|
|
arith_expr: term (('+'|'-') term)*
|
|
term: factor (('*'|'/'|'%') factor)*
|
|
factor: ('+'|'-'|'~') factor | atom trailer*
|
|
atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' [dictmaker] '}' | '`' testlist '`' | NAME | NUMBER | STRING
|
|
lambdef: 'lambda' [varargslist] ':' test
|
|
trailer: '(' [testlist] ')' | '[' subscript ']' | '.' NAME
|
|
subscript: test | [test] ':' [test]
|
|
exprlist: expr (',' expr)* [',']
|
|
testlist: test (',' test)* [',']
|
|
dictmaker: test ':' test (',' test ':' test)* [',']
|
|
|
|
classdef: 'class' NAME ['(' testlist ')'] ':' suite
|