Source code for bokeh.util.strings

#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' Functions useful for string manipulations or encoding.

'''

#-----------------------------------------------------------------------------
# Boilerplate
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from __future__ import annotations

import logging  # isort:skip

log = logging.getLogger(__name__)

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# Imports
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# Standard library imports
import re
from typing import Any, Iterable, overload
from urllib.parse import quote_plus

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# Globals and constants
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__all__ = (
    'append_docstring',
    'format_docstring',
    'indent',
    'nice_join',
    'snakify',
)

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# General API
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[docs]def indent(text: str, n: int = 2, ch: str = " ") -> str: ''' Indent all the lines in a given block of text by a specified amount. Args: text (str) : The text to indent n (int, optional) : The amount to indent each line by (default: 2) ch (char, optional) : What character to fill the indentation with (default: " ") ''' padding = ch * n return "\n".join(padding + line for line in text.split("\n"))
[docs]def nice_join(seq: Iterable[str], sep: str = ", ", conjuction: str = "or") -> str: ''' Join together sequences of strings into English-friendly phrases using the conjunction ``or`` when appropriate. Args: seq (seq[str]) : a sequence of strings to nicely join sep (str, optional) : a sequence delimiter to use (default: ", ") conjunction (str or None, optional) : a conjuction to use for the last two items, or None to reproduce basic join behaviour (default: "or") Returns: a joined string Examples: >>> nice_join(["a", "b", "c"]) 'a, b or c' ''' seq = [str(x) for x in seq] if len(seq) <= 1 or conjuction is None: return sep.join(seq) else: return f"{sep.join(seq[:-1])} {conjuction} {seq[-1]}"
[docs]def snakify(name: str, sep: str = "_") -> str: ''' Convert CamelCase to snake_case. ''' name = re.sub("([A-Z]+)([A-Z][a-z])", r"\1%s\2" % sep, name) name = re.sub("([a-z\\d])([A-Z])", r"\1%s\2" % sep, name) return name.lower()
[docs]def append_docstring(docstring: str | None, extra: str) -> str | None: ''' Safely append to docstrings. When Python is executed with the ``-OO`` option, doc strings are removed and replaced the value ``None``. This function guards against appending the extra content in that case. Args: docstring (str or None) : The docstring to format, or None extra (str): the content to append if docstring is not None Returns: str or None ''' return None if docstring is None else docstring + extra
@overload def format_docstring(docstring: None, *args: Any, **kwargs: Any) -> None: ... @overload def format_docstring(docstring: str, *args: Any, **kwargs: Any) -> str: ...
[docs]def format_docstring(docstring: str | None, *args: Any, **kwargs: Any) -> str | None: ''' Safely format docstrings. When Python is executed with the ``-OO`` option, doc strings are removed and replaced the value ``None``. This function guards against applying the string formatting options in that case. Args: docstring (str or None) : The docstring to format, or ``None`` args (tuple) : string formatting arguments for the docsring kwargs (dict) : string formatting arguments for the docsring Returns: str or None ''' return None if docstring is None else docstring.format(*args, **kwargs)
def format_url_query_arguments(url: str, arguments: dict[str, str] | None = None) -> str: ''' Format a base URL with optional query arguments Args: url (str) : An base URL to append query arguments to arguments (dict or None, optional) : A mapping of key/value URL query arguments, or None (default: None) Returns: str ''' if arguments is not None: items = (f"{quote_plus(key)}={quote_plus(value)}" for key, value in arguments.items()) url += "?" + "&".join(items) return url #----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------