[issue46485] ~ PEG operator in the grammar

[Robert Einhorn]

Robert Einhorn  added the comment:

Thanks

--
resolution: not a bug -> 
status: closed -> open

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[issue46485] ~ PEG operator in the grammar

[Robert Einhorn]

New submission from Robert Einhorn :

This is probably not an error and I may misinterpret the PEP 617, but I don't 
know what the ~ PEG operator means in the next rule if there is no alternative:
assignment_expression:
| NAME ':=' ~ expression


And similarly with this rule if there is no more alternative:
assignment:
| NAME ':' expression ['=' annotated_rhs ] 
| ('(' single_target ')' 
 | single_subscript_attribute_target) ':' expression ['=' annotated_rhs 
] 
| (star_targets '=' )+ (yield_expr | star_expressions) !'=' [TYPE_COMMENT] 
| single_target augassign ~ (yield_expr | star_expressions)

Related links:
https://docs.python.org/3/reference/grammar.html
https://www.python.org/dev/peps/pep-0617/#id9

--
components: Parser
messages: 411360
nosy: RobEin, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: ~ PEG operator in the grammar
versions: Python 3.10

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[issue46231] grammar rule definition is missing: invalid_double_starred_kvpairs

[Robert Einhorn]

New submission from Robert Einhorn :

Definition of invalid_double_starred_kvpairs PEG grammar rule is not found:

https://docs.python.org/3.10/reference/grammar.html

# PEG grammar rule:
dict:
| '{' [double_starred_kvpairs] '}' 
| '{' invalid_double_starred_kvpairs '}'

--
components: Parser
messages: 409525
nosy: RobEin, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: grammar rule definition is missing: invalid_double_starred_kvpairs
versions: Python 3.10

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[issue46230] NEWLINE* is missing in 'file' rule in PEG grammar

[Robert Einhorn]

New submission from Robert Einhorn :

https://docs.python.org/3.10/reference/grammar.html

# original grammar rule:
file: [statements] ENDMARKER 


# suggested grammar rule:
file: NEWLINE* [statements] ENDMARKER

--
components: Parser
messages: 409524
nosy: RobEin, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: NEWLINE* is missing in 'file' rule in PEG grammar
versions: Python 3.10

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