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Added 'continue', semicolons and dictionary displays.

This commit is contained in:
Guido van Rossum 1991-07-17 18:39:15 +00:00
parent 2fe53f7fec
commit 56f7837704
1 changed files with 24 additions and 15 deletions
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@ -1,4 +1,10 @@
# Grammar for Python, version 4 # Grammar for Python, version 5
# Changes compared to version 4:
# Semicolons can separate small statements
# 'continue' statement
# Dictionary constructors: {key:value, key:value, ...}
# More tests instead of exprs
# Changes compared to version 3: # Changes compared to version 3:
# Removed 'dir' statement. # Removed 'dir' statement.
@ -34,23 +40,25 @@ fplist: fpdef (',' fpdef)*
fpdef: NAME | '(' fplist ')' fpdef: NAME | '(' fplist ')'
stmt: simple_stmt | compound_stmt stmt: simple_stmt | compound_stmt
simple_stmt: expr_stmt | print_stmt | pass_stmt | del_stmt | flow_stmt | import_stmt simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
expr_stmt: (exprlist '=')* exprlist NEWLINE small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt
expr_stmt: (exprlist '=')* exprlist
# For assignments, additional restrictions enforced by the interpreter # For assignments, additional restrictions enforced by the interpreter
print_stmt: 'print' (test ',')* [test] NEWLINE print_stmt: 'print' (test ',')* [test]
del_stmt: 'del' exprlist NEWLINE del_stmt: 'del' exprlist
pass_stmt: 'pass' NEWLINE pass_stmt: 'pass'
flow_stmt: break_stmt | return_stmt | raise_stmt flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt
break_stmt: 'break' NEWLINE break_stmt: 'break'
return_stmt: 'return' [testlist] NEWLINE continue_stmt: 'continue'
raise_stmt: 'raise' expr [',' expr] NEWLINE return_stmt: 'return' [testlist]
import_stmt: 'import' NAME (',' NAME)* NEWLINE | 'from' NAME 'import' ('*' | NAME (',' NAME)*) NEWLINE raise_stmt: 'raise' test [',' test]
import_stmt: 'import' NAME (',' NAME)* | 'from' NAME 'import' ('*' | NAME (',' NAME)*)
compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef
if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
while_stmt: 'while' test ':' suite ['else' ':' suite] while_stmt: 'while' test ':' suite ['else' ':' suite]
for_stmt: 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite] for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite]
try_stmt: 'try' ':' suite (except_clause ':' suite)* ['finally' ':' suite] try_stmt: 'try' ':' suite (except_clause ':' suite)* ['finally' ':' suite]
except_clause: 'except' [expr [',' expr]] except_clause: 'except' [test [',' test]]
suite: simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT suite: simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT
test: and_test ('or' and_test)* test: and_test ('or' and_test)*
@ -61,11 +69,12 @@ comp_op: '<'|'>'|'='|'>' '='|'<' '='|'<' '>'|'in'|'not' 'in'|'is'|'is' 'not'
expr: term (('+'|'-') term)* expr: term (('+'|'-') term)*
term: factor (('*'|'/'|'%') factor)* term: factor (('*'|'/'|'%') factor)*
factor: ('+'|'-') factor | atom trailer* factor: ('+'|'-') factor | atom trailer*
atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' '}' | '`' testlist '`' | NAME | NUMBER | STRING atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' [dictmaker] '}' | '`' testlist '`' | NAME | NUMBER | STRING
trailer: '(' [testlist] ')' | '[' subscript ']' | '.' NAME trailer: '(' [testlist] ')' | '[' subscript ']' | '.' NAME
subscript: expr | [expr] ':' [expr] subscript: test | [test] ':' [test]
exprlist: expr (',' expr)* [','] exprlist: expr (',' expr)* [',']
testlist: test (',' test)* [','] testlist: test (',' test)* [',']
dictmaker: test ':' test (',' test ':' test)* [',']
classdef: 'class' NAME parameters ['=' baselist] ':' suite classdef: 'class' NAME parameters ['=' baselist] ':' suite
baselist: atom arguments (',' atom arguments)* baselist: atom arguments (',' atom arguments)*