[Python-checkins] r75081 - in sandbox/trunk/2to3/lib2to3: Grammar.txt tests/test_parser.py

[benjamin.peterson]

Author: benjamin.peterson
Date: Sun Sep 27 05:02:57 2009
New Revision: 75081

Log:
let 2to3 work with extended iterable unpacking

Modified:
   sandbox/trunk/2to3/lib2to3/Grammar.txt
   sandbox/trunk/2to3/lib2to3/tests/test_parser.py

Modified: sandbox/trunk/2to3/lib2to3/Grammar.txt
==============================================================================
--- sandbox/trunk/2to3/lib2to3/Grammar.txt	(original)
+++ sandbox/trunk/2to3/lib2to3/Grammar.txt	Sun Sep 27 05:02:57 2009
@@ -53,8 +53,9 @@
 simple_stmt: small_stmt (';' 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: testlist (augassign (yield_expr|testlist) |
-                     ('=' (yield_expr|testlist))*)
+expr_stmt: testlist_star_expr (augassign (yield_expr|testlist) |
+                     ('=' (yield_expr|testlist_star_expr))*)
+testlist_star_expr: (test|star_expr) (',' (test|star_expr))* [',']
 augassign: ('+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' |
             '<<=' | '>>=' | '**=' | '//=')
 # For normal assignments, additional restrictions enforced by the interpreter
@@ -112,6 +113,7 @@
 not_test: 'not' not_test | comparison
 comparison: expr (comp_op expr)*
 comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
+star_expr: '*' expr
 expr: xor_expr ('|' xor_expr)*
 xor_expr: and_expr ('^' and_expr)*
 and_expr: shift_expr ('&' shift_expr)*
@@ -125,14 +127,14 @@
        '{' [dictsetmaker] '}' |
        '`' testlist1 '`' |
        NAME | NUMBER | STRING+ | '.' '.' '.')
-listmaker: test ( comp_for | (',' test)* [','] )
-testlist_gexp: test ( comp_for | (',' test)* [','] )
+listmaker: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )
+testlist_gexp: test ( comp_for | (',' (test|star_expr))* [','] )
 lambdef: 'lambda' [varargslist] ':' test
 trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME
 subscriptlist: subscript (',' subscript)* [',']
 subscript: test | [test] ':' [test] [sliceop]
 sliceop: ':' [test]
-exprlist: expr (',' expr)* [',']
+exprlist: (expr|star_expr) (',' (expr|star_expr))* [',']
 testlist: test (',' test)* [',']
 dictsetmaker: ( (test ':' test (comp_for | (',' test ':' test)* [','])) |
                 (test (comp_for | (',' test)* [','])) )

Modified: sandbox/trunk/2to3/lib2to3/tests/test_parser.py
==============================================================================
--- sandbox/trunk/2to3/lib2to3/tests/test_parser.py	(original)
+++ sandbox/trunk/2to3/lib2to3/tests/test_parser.py	Sun Sep 27 05:02:57 2009
@@ -161,6 +161,11 @@
             if diff(filepath, new):
                 self.fail("Idempotency failed: %s" % filepath)
 
+    def test_extended_unpacking(self):
+        driver.parse_string("a, *b, c = x\n")
+        driver.parse_string("[*a, b] = x\n")
+        driver.parse_string("(z, *y, w) = m\n")
+        driver.parse_string("for *z, m in d: pass\n")
 
 class TestLiterals(GrammarTest):