60 lines
1.6 KiB
Python
60 lines
1.6 KiB
Python
# encoding: utf-8
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"""
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The actual code (MVC pattern) for `StringConstructorFormatter` node.
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"""
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import typing as _t
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import sys as _sys
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from .funcs_common import _show_text_on_node, _verify_input_dict
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_RECURSION_LIMIT = max(int(_sys.getrecursionlimit()), 10) # You can externally monkey-patch it... but if it blows up, your fault 🤷🏻♂️
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def _recursive_format(template: str, format_dict: _t.Dict[str, _t.Any], show: bool = True, unique_id: str = None) -> str:
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"""
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It's not actually recursive - because, you know, any recursion could be turned into iteration,
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and good boys do that. 😊
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"""
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assert isinstance(_RECURSION_LIMIT, int) and _RECURSION_LIMIT > 0
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prev: str = ''
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new: str = template
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for i in range(_RECURSION_LIMIT):
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if prev == new:
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break
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prev = new
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new = new.format_map(format_dict)
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if prev == new:
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return new
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msg = (
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f"Recursion limit ({_RECURSION_LIMIT}) reached on attempt to format a string: {template!r}\n"
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f"Last two formatting attempts:\n{prev!r}\n{new!r}"
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)
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if show and unique_id:
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_show_text_on_node(msg, unique_id)
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raise RecursionError(msg)
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# noinspection PyUnreachableCode
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return '' # just to be safe
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def formatter(
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template: str, recursive: bool = False, format_dict: _t.Dict[str, _t.Any] = None,
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show: bool = True, unique_id: str = None
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) -> _t.Tuple[str]:
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format_dict = _verify_input_dict(format_dict)
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if not isinstance(template, str):
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raise TypeError(f"Not a string: {template!r}")
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out_text = (
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_recursive_format(template, format_dict, show, unique_id)
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if recursive
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else template.format_map(format_dict)
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)
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if show and unique_id:
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_show_text_on_node(out_text, unique_id)
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return (out_text, )
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