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Easier creation of _ast nodes #46757

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birkenfeld opened this issue Mar 29, 2008 · 6 comments
Closed

Easier creation of _ast nodes #46757

birkenfeld opened this issue Mar 29, 2008 · 6 comments
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extension-modules C modules in the Modules dir type-bug An unexpected behavior, bug, or error

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@birkenfeld
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birkenfeld commented Mar 29, 2008

BPO 2505
Nosy @loewis, @birkenfeld
Files
  • ast-attrs.diff
  • ast-constructor-v2.diff
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/birkenfeld'
    closed_at = <Date 2008-03-30.07:01:54.812>
    created_at = <Date 2008-03-29.13:38:09.563>
    labels = ['extension-modules', 'type-bug']
    title = 'Easier creation of _ast nodes'
    updated_at = <Date 2008-03-30.07:01:54.811>
    user = 'https://github.com/birkenfeld'

    bugs.python.org fields:

    activity = <Date 2008-03-30.07:01:54.811>
    actor = 'georg.brandl'
    assignee = 'georg.brandl'
    closed = True
    closed_date = <Date 2008-03-30.07:01:54.812>
    closer = 'georg.brandl'
    components = ['Extension Modules']
    creation = <Date 2008-03-29.13:38:09.563>
    creator = 'georg.brandl'
    dependencies = []
    files = ['9887', '9893']
    hgrepos = []
    issue_num = 2505
    keywords = ['patch']
    message_count = 6.0
    messages = ['64691', '64693', '64700', '64715', '64722', '64744']
    nosy_count = 2.0
    nosy_names = ['loewis', 'georg.brandl']
    pr_nums = []
    priority = 'normal'
    resolution = 'accepted'
    stage = None
    status = 'closed'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue2505'
    versions = ['Python 2.6', 'Python 3.0']

    @birkenfeld
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    birkenfeld commented Mar 29, 2008

    This patch adds two things to the _ast module:

    • Nodes can be initialized with keyword arguments:
      m = _ast.Module(body=[...])

    • Only attributes that are in _fields or _attributes can be set on nodes.

    Martin, what do you think?

    @birkenfeld birkenfeld added extension-modules C modules in the Modules dir type-bug An unexpected behavior, bug, or error labels Mar 29, 2008
    @birkenfeld
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    birkenfeld commented Mar 29, 2008

    On second thought, restricting node attributes may prevent custom AST
    processing tools from adding useful information themselves...

    @loewis
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    Mannequin

    loewis mannequin commented Mar 29, 2008

    On second thought, restricting node attributes may prevent custom AST
    processing tools from adding useful information themselves...

    Indeed. If anything is to be checked, it should be whether the child
    nodes or attributes have the right types. However, that should rather
    be done in a recursive check function on _mod, which then would also
    check whether all necessary fields have been set. Or, such checks
    could be delayed until actual compilation of the tree is attempted
    (i.e. conversion to the C AST structures).

    As for being able to pass constructor arguments: I'd expect them
    to be positional arguments, not keyword arguments - anybody creating
    AST nodes would normally have Python.asdl open, no?

    @birkenfeld
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    birkenfeld commented Mar 29, 2008

    Okay, I'm dropping the attribute restriction part.

    Attaching new patch that allows creating nodes with fields (not
    attributes) as positional arguments, and setting all keyword arguments
    as attributes on self.

    @birkenfeld birkenfeld changed the title Restrict attributes of _ast nodes Easier creation of _ast nodes Mar 29, 2008
    @loewis
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    loewis mannequin commented Mar 29, 2008

    Looks fine to me. It might be reasonable to further restrict the
    constructor to either 0 or len(_fields) arguments.

    @loewis loewis mannequin assigned birkenfeld and unassigned loewis Mar 29, 2008
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    birkenfeld commented Mar 30, 2008

    Committed in r62049.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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