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64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
2 years ago
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import typing as t
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from . import Markup
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def escape(s: t.Any) -> Markup:
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"""Replace the characters ``&``, ``<``, ``>``, ``'``, and ``"`` in
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the string with HTML-safe sequences. Use this if you need to display
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text that might contain such characters in HTML.
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If the object has an ``__html__`` method, it is called and the
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return value is assumed to already be safe for HTML.
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:param s: An object to be converted to a string and escaped.
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:return: A :class:`Markup` string with the escaped text.
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"""
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if hasattr(s, "__html__"):
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return Markup(s.__html__())
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return Markup(
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str(s)
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.replace("&", "&")
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.replace(">", ">")
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.replace("<", "<")
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.replace("'", "'")
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.replace('"', """)
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)
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def escape_silent(s: t.Optional[t.Any]) -> Markup:
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"""Like :func:`escape` but treats ``None`` as the empty string.
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Useful with optional values, as otherwise you get the string
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``'None'`` when the value is ``None``.
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>>> escape(None)
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Markup('None')
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>>> escape_silent(None)
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Markup('')
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"""
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if s is None:
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return Markup()
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return escape(s)
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def soft_str(s: t.Any) -> str:
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"""Convert an object to a string if it isn't already. This preserves
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a :class:`Markup` string rather than converting it back to a basic
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string, so it will still be marked as safe and won't be escaped
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again.
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>>> value = escape("<User 1>")
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>>> value
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Markup('<User 1>')
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>>> escape(str(value))
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Markup('&lt;User 1&gt;')
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>>> escape(soft_str(value))
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Markup('<User 1>')
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"""
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if not isinstance(s, str):
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return str(s)
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return s
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