forked from s434650/CatOrNot
669 lines
23 KiB
Python
669 lines
23 KiB
Python
![]() |
import os
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import stat
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from datetime import datetime
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from ._compat import open_stream, text_type, filename_to_ui, \
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get_filesystem_encoding, get_streerror, _get_argv_encoding, PY2
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from .exceptions import BadParameter
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from .utils import safecall, LazyFile
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class ParamType(object):
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"""Helper for converting values through types. The following is
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necessary for a valid type:
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* it needs a name
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* it needs to pass through None unchanged
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* it needs to convert from a string
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* it needs to convert its result type through unchanged
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(eg: needs to be idempotent)
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* it needs to be able to deal with param and context being `None`.
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This can be the case when the object is used with prompt
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inputs.
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"""
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is_composite = False
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#: the descriptive name of this type
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name = None
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#: if a list of this type is expected and the value is pulled from a
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#: string environment variable, this is what splits it up. `None`
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#: means any whitespace. For all parameters the general rule is that
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#: whitespace splits them up. The exception are paths and files which
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#: are split by ``os.path.pathsep`` by default (":" on Unix and ";" on
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#: Windows).
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envvar_list_splitter = None
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def __call__(self, value, param=None, ctx=None):
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if value is not None:
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return self.convert(value, param, ctx)
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def get_metavar(self, param):
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"""Returns the metavar default for this param if it provides one."""
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def get_missing_message(self, param):
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"""Optionally might return extra information about a missing
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parameter.
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.. versionadded:: 2.0
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"""
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def convert(self, value, param, ctx):
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"""Converts the value. This is not invoked for values that are
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`None` (the missing value).
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"""
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return value
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def split_envvar_value(self, rv):
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"""Given a value from an environment variable this splits it up
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into small chunks depending on the defined envvar list splitter.
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If the splitter is set to `None`, which means that whitespace splits,
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then leading and trailing whitespace is ignored. Otherwise, leading
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and trailing splitters usually lead to empty items being included.
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"""
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return (rv or '').split(self.envvar_list_splitter)
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def fail(self, message, param=None, ctx=None):
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"""Helper method to fail with an invalid value message."""
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raise BadParameter(message, ctx=ctx, param=param)
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class CompositeParamType(ParamType):
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is_composite = True
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@property
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def arity(self):
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raise NotImplementedError()
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class FuncParamType(ParamType):
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def __init__(self, func):
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self.name = func.__name__
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self.func = func
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def convert(self, value, param, ctx):
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try:
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return self.func(value)
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except ValueError:
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try:
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value = text_type(value)
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except UnicodeError:
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value = str(value).decode('utf-8', 'replace')
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self.fail(value, param, ctx)
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class UnprocessedParamType(ParamType):
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name = 'text'
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def convert(self, value, param, ctx):
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return value
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def __repr__(self):
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return 'UNPROCESSED'
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class StringParamType(ParamType):
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name = 'text'
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def convert(self, value, param, ctx):
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if isinstance(value, bytes):
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enc = _get_argv_encoding()
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try:
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value = value.decode(enc)
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except UnicodeError:
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fs_enc = get_filesystem_encoding()
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if fs_enc != enc:
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try:
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value = value.decode(fs_enc)
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except UnicodeError:
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value = value.decode('utf-8', 'replace')
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return value
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return value
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def __repr__(self):
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return 'STRING'
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class Choice(ParamType):
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"""The choice type allows a value to be checked against a fixed set
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of supported values. All of these values have to be strings.
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You should only pass a list or tuple of choices. Other iterables
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(like generators) may lead to surprising results.
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See :ref:`choice-opts` for an example.
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:param case_sensitive: Set to false to make choices case
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insensitive. Defaults to true.
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"""
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name = 'choice'
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def __init__(self, choices, case_sensitive=True):
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self.choices = choices
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self.case_sensitive = case_sensitive
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def get_metavar(self, param):
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return '[%s]' % '|'.join(self.choices)
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def get_missing_message(self, param):
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return 'Choose from:\n\t%s.' % ',\n\t'.join(self.choices)
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def convert(self, value, param, ctx):
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# Exact match
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if value in self.choices:
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return value
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# Match through normalization and case sensitivity
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# first do token_normalize_func, then lowercase
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# preserve original `value` to produce an accurate message in
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# `self.fail`
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normed_value = value
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normed_choices = self.choices
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if ctx is not None and \
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ctx.token_normalize_func is not None:
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normed_value = ctx.token_normalize_func(value)
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normed_choices = [ctx.token_normalize_func(choice) for choice in
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self.choices]
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if not self.case_sensitive:
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normed_value = normed_value.lower()
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normed_choices = [choice.lower() for choice in normed_choices]
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if normed_value in normed_choices:
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return normed_value
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self.fail('invalid choice: %s. (choose from %s)' %
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(value, ', '.join(self.choices)), param, ctx)
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def __repr__(self):
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return 'Choice(%r)' % list(self.choices)
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class DateTime(ParamType):
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"""The DateTime type converts date strings into `datetime` objects.
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The format strings which are checked are configurable, but default to some
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common (non-timezone aware) ISO 8601 formats.
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When specifying *DateTime* formats, you should only pass a list or a tuple.
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Other iterables, like generators, may lead to surprising results.
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The format strings are processed using ``datetime.strptime``, and this
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consequently defines the format strings which are allowed.
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Parsing is tried using each format, in order, and the first format which
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parses successfully is used.
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:param formats: A list or tuple of date format strings, in the order in
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which they should be tried. Defaults to
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``'%Y-%m-%d'``, ``'%Y-%m-%dT%H:%M:%S'``,
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``'%Y-%m-%d %H:%M:%S'``.
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"""
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name = 'datetime'
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def __init__(self, formats=None):
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self.formats = formats or [
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'%Y-%m-%d',
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'%Y-%m-%dT%H:%M:%S',
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'%Y-%m-%d %H:%M:%S'
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]
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def get_metavar(self, param):
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return '[{}]'.format('|'.join(self.formats))
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def _try_to_convert_date(self, value, format):
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try:
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return datetime.strptime(value, format)
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except ValueError:
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return None
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def convert(self, value, param, ctx):
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# Exact match
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for format in self.formats:
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dtime = self._try_to_convert_date(value, format)
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if dtime:
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return dtime
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self.fail(
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'invalid datetime format: {}. (choose from {})'.format(
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value, ', '.join(self.formats)))
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def __repr__(self):
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return 'DateTime'
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class IntParamType(ParamType):
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name = 'integer'
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def convert(self, value, param, ctx):
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try:
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return int(value)
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except (ValueError, UnicodeError):
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self.fail('%s is not a valid integer' % value, param, ctx)
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def __repr__(self):
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return 'INT'
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class IntRange(IntParamType):
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"""A parameter that works similar to :data:`click.INT` but restricts
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the value to fit into a range. The default behavior is to fail if the
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value falls outside the range, but it can also be silently clamped
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between the two edges.
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See :ref:`ranges` for an example.
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"""
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name = 'integer range'
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def __init__(self, min=None, max=None, clamp=False):
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self.min = min
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self.max = max
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self.clamp = clamp
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def convert(self, value, param, ctx):
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rv = IntParamType.convert(self, value, param, ctx)
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if self.clamp:
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if self.min is not None and rv < self.min:
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return self.min
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if self.max is not None and rv > self.max:
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return self.max
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if self.min is not None and rv < self.min or \
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self.max is not None and rv > self.max:
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if self.min is None:
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self.fail('%s is bigger than the maximum valid value '
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'%s.' % (rv, self.max), param, ctx)
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elif self.max is None:
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self.fail('%s is smaller than the minimum valid value '
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'%s.' % (rv, self.min), param, ctx)
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else:
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self.fail('%s is not in the valid range of %s to %s.'
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% (rv, self.min, self.max), param, ctx)
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return rv
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def __repr__(self):
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return 'IntRange(%r, %r)' % (self.min, self.max)
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class FloatParamType(ParamType):
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name = 'float'
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def convert(self, value, param, ctx):
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try:
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return float(value)
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except (UnicodeError, ValueError):
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self.fail('%s is not a valid floating point value' %
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value, param, ctx)
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def __repr__(self):
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return 'FLOAT'
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class FloatRange(FloatParamType):
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"""A parameter that works similar to :data:`click.FLOAT` but restricts
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the value to fit into a range. The default behavior is to fail if the
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value falls outside the range, but it can also be silently clamped
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between the two edges.
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See :ref:`ranges` for an example.
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"""
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name = 'float range'
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def __init__(self, min=None, max=None, clamp=False):
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self.min = min
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self.max = max
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self.clamp = clamp
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def convert(self, value, param, ctx):
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rv = FloatParamType.convert(self, value, param, ctx)
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if self.clamp:
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if self.min is not None and rv < self.min:
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return self.min
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if self.max is not None and rv > self.max:
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return self.max
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if self.min is not None and rv < self.min or \
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self.max is not None and rv > self.max:
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if self.min is None:
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self.fail('%s is bigger than the maximum valid value '
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'%s.' % (rv, self.max), param, ctx)
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elif self.max is None:
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self.fail('%s is smaller than the minimum valid value '
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'%s.' % (rv, self.min), param, ctx)
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else:
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self.fail('%s is not in the valid range of %s to %s.'
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% (rv, self.min, self.max), param, ctx)
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return rv
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def __repr__(self):
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return 'FloatRange(%r, %r)' % (self.min, self.max)
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class BoolParamType(ParamType):
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name = 'boolean'
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def convert(self, value, param, ctx):
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if isinstance(value, bool):
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return bool(value)
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value = value.lower()
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if value in ('true', 't', '1', 'yes', 'y'):
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return True
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elif value in ('false', 'f', '0', 'no', 'n'):
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return False
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self.fail('%s is not a valid boolean' % value, param, ctx)
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|
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def __repr__(self):
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return 'BOOL'
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|
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|
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class UUIDParameterType(ParamType):
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name = 'uuid'
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|
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|
def convert(self, value, param, ctx):
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import uuid
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try:
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if PY2 and isinstance(value, text_type):
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value = value.encode('ascii')
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return uuid.UUID(value)
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except (UnicodeError, ValueError):
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self.fail('%s is not a valid UUID value' % value, param, ctx)
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|
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||
|
def __repr__(self):
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|
return 'UUID'
|
||
|
|
||
|
|
||
|
class File(ParamType):
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"""Declares a parameter to be a file for reading or writing. The file
|
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|
is automatically closed once the context tears down (after the command
|
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|
finished working).
|
||
|
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|
Files can be opened for reading or writing. The special value ``-``
|
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|
indicates stdin or stdout depending on the mode.
|
||
|
|
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|
By default, the file is opened for reading text data, but it can also be
|
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|
opened in binary mode or for writing. The encoding parameter can be used
|
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|
to force a specific encoding.
|
||
|
|
||
|
The `lazy` flag controls if the file should be opened immediately or upon
|
||
|
first IO. The default is to be non-lazy for standard input and output
|
||
|
streams as well as files opened for reading, `lazy` otherwise. When opening a
|
||
|
file lazily for reading, it is still opened temporarily for validation, but
|
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|
will not be held open until first IO. lazy is mainly useful when opening
|
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|
for writing to avoid creating the file until it is needed.
|
||
|
|
||
|
Starting with Click 2.0, files can also be opened atomically in which
|
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|
case all writes go into a separate file in the same folder and upon
|
||
|
completion the file will be moved over to the original location. This
|
||
|
is useful if a file regularly read by other users is modified.
|
||
|
|
||
|
See :ref:`file-args` for more information.
|
||
|
"""
|
||
|
name = 'filename'
|
||
|
envvar_list_splitter = os.path.pathsep
|
||
|
|
||
|
def __init__(self, mode='r', encoding=None, errors='strict', lazy=None,
|
||
|
atomic=False):
|
||
|
self.mode = mode
|
||
|
self.encoding = encoding
|
||
|
self.errors = errors
|
||
|
self.lazy = lazy
|
||
|
self.atomic = atomic
|
||
|
|
||
|
def resolve_lazy_flag(self, value):
|
||
|
if self.lazy is not None:
|
||
|
return self.lazy
|
||
|
if value == '-':
|
||
|
return False
|
||
|
elif 'w' in self.mode:
|
||
|
return True
|
||
|
return False
|
||
|
|
||
|
def convert(self, value, param, ctx):
|
||
|
try:
|
||
|
if hasattr(value, 'read') or hasattr(value, 'write'):
|
||
|
return value
|
||
|
|
||
|
lazy = self.resolve_lazy_flag(value)
|
||
|
|
||
|
if lazy:
|
||
|
f = LazyFile(value, self.mode, self.encoding, self.errors,
|
||
|
atomic=self.atomic)
|
||
|
if ctx is not None:
|
||
|
ctx.call_on_close(f.close_intelligently)
|
||
|
return f
|
||
|
|
||
|
f, should_close = open_stream(value, self.mode,
|
||
|
self.encoding, self.errors,
|
||
|
atomic=self.atomic)
|
||
|
# If a context is provided, we automatically close the file
|
||
|
# at the end of the context execution (or flush out). If a
|
||
|
# context does not exist, it's the caller's responsibility to
|
||
|
# properly close the file. This for instance happens when the
|
||
|
# type is used with prompts.
|
||
|
if ctx is not None:
|
||
|
if should_close:
|
||
|
ctx.call_on_close(safecall(f.close))
|
||
|
else:
|
||
|
ctx.call_on_close(safecall(f.flush))
|
||
|
return f
|
||
|
except (IOError, OSError) as e:
|
||
|
self.fail('Could not open file: %s: %s' % (
|
||
|
filename_to_ui(value),
|
||
|
get_streerror(e),
|
||
|
), param, ctx)
|
||
|
|
||
|
|
||
|
class Path(ParamType):
|
||
|
"""The path type is similar to the :class:`File` type but it performs
|
||
|
different checks. First of all, instead of returning an open file
|
||
|
handle it returns just the filename. Secondly, it can perform various
|
||
|
basic checks about what the file or directory should be.
|
||
|
|
||
|
.. versionchanged:: 6.0
|
||
|
`allow_dash` was added.
|
||
|
|
||
|
:param exists: if set to true, the file or directory needs to exist for
|
||
|
this value to be valid. If this is not required and a
|
||
|
file does indeed not exist, then all further checks are
|
||
|
silently skipped.
|
||
|
:param file_okay: controls if a file is a possible value.
|
||
|
:param dir_okay: controls if a directory is a possible value.
|
||
|
:param writable: if true, a writable check is performed.
|
||
|
:param readable: if true, a readable check is performed.
|
||
|
:param resolve_path: if this is true, then the path is fully resolved
|
||
|
before the value is passed onwards. This means
|
||
|
that it's absolute and symlinks are resolved. It
|
||
|
will not expand a tilde-prefix, as this is
|
||
|
supposed to be done by the shell only.
|
||
|
:param allow_dash: If this is set to `True`, a single dash to indicate
|
||
|
standard streams is permitted.
|
||
|
:param path_type: optionally a string type that should be used to
|
||
|
represent the path. The default is `None` which
|
||
|
means the return value will be either bytes or
|
||
|
unicode depending on what makes most sense given the
|
||
|
input data Click deals with.
|
||
|
"""
|
||
|
envvar_list_splitter = os.path.pathsep
|
||
|
|
||
|
def __init__(self, exists=False, file_okay=True, dir_okay=True,
|
||
|
writable=False, readable=True, resolve_path=False,
|
||
|
allow_dash=False, path_type=None):
|
||
|
self.exists = exists
|
||
|
self.file_okay = file_okay
|
||
|
self.dir_okay = dir_okay
|
||
|
self.writable = writable
|
||
|
self.readable = readable
|
||
|
self.resolve_path = resolve_path
|
||
|
self.allow_dash = allow_dash
|
||
|
self.type = path_type
|
||
|
|
||
|
if self.file_okay and not self.dir_okay:
|
||
|
self.name = 'file'
|
||
|
self.path_type = 'File'
|
||
|
elif self.dir_okay and not self.file_okay:
|
||
|
self.name = 'directory'
|
||
|
self.path_type = 'Directory'
|
||
|
else:
|
||
|
self.name = 'path'
|
||
|
self.path_type = 'Path'
|
||
|
|
||
|
def coerce_path_result(self, rv):
|
||
|
if self.type is not None and not isinstance(rv, self.type):
|
||
|
if self.type is text_type:
|
||
|
rv = rv.decode(get_filesystem_encoding())
|
||
|
else:
|
||
|
rv = rv.encode(get_filesystem_encoding())
|
||
|
return rv
|
||
|
|
||
|
def convert(self, value, param, ctx):
|
||
|
rv = value
|
||
|
|
||
|
is_dash = self.file_okay and self.allow_dash and rv in (b'-', '-')
|
||
|
|
||
|
if not is_dash:
|
||
|
if self.resolve_path:
|
||
|
rv = os.path.realpath(rv)
|
||
|
|
||
|
try:
|
||
|
st = os.stat(rv)
|
||
|
except OSError:
|
||
|
if not self.exists:
|
||
|
return self.coerce_path_result(rv)
|
||
|
self.fail('%s "%s" does not exist.' % (
|
||
|
self.path_type,
|
||
|
filename_to_ui(value)
|
||
|
), param, ctx)
|
||
|
|
||
|
if not self.file_okay and stat.S_ISREG(st.st_mode):
|
||
|
self.fail('%s "%s" is a file.' % (
|
||
|
self.path_type,
|
||
|
filename_to_ui(value)
|
||
|
), param, ctx)
|
||
|
if not self.dir_okay and stat.S_ISDIR(st.st_mode):
|
||
|
self.fail('%s "%s" is a directory.' % (
|
||
|
self.path_type,
|
||
|
filename_to_ui(value)
|
||
|
), param, ctx)
|
||
|
if self.writable and not os.access(value, os.W_OK):
|
||
|
self.fail('%s "%s" is not writable.' % (
|
||
|
self.path_type,
|
||
|
filename_to_ui(value)
|
||
|
), param, ctx)
|
||
|
if self.readable and not os.access(value, os.R_OK):
|
||
|
self.fail('%s "%s" is not readable.' % (
|
||
|
self.path_type,
|
||
|
filename_to_ui(value)
|
||
|
), param, ctx)
|
||
|
|
||
|
return self.coerce_path_result(rv)
|
||
|
|
||
|
|
||
|
class Tuple(CompositeParamType):
|
||
|
"""The default behavior of Click is to apply a type on a value directly.
|
||
|
This works well in most cases, except for when `nargs` is set to a fixed
|
||
|
count and different types should be used for different items. In this
|
||
|
case the :class:`Tuple` type can be used. This type can only be used
|
||
|
if `nargs` is set to a fixed number.
|
||
|
|
||
|
For more information see :ref:`tuple-type`.
|
||
|
|
||
|
This can be selected by using a Python tuple literal as a type.
|
||
|
|
||
|
:param types: a list of types that should be used for the tuple items.
|
||
|
"""
|
||
|
|
||
|
def __init__(self, types):
|
||
|
self.types = [convert_type(ty) for ty in types]
|
||
|
|
||
|
@property
|
||
|
def name(self):
|
||
|
return "<" + " ".join(ty.name for ty in self.types) + ">"
|
||
|
|
||
|
@property
|
||
|
def arity(self):
|
||
|
return len(self.types)
|
||
|
|
||
|
def convert(self, value, param, ctx):
|
||
|
if len(value) != len(self.types):
|
||
|
raise TypeError('It would appear that nargs is set to conflict '
|
||
|
'with the composite type arity.')
|
||
|
return tuple(ty(x, param, ctx) for ty, x in zip(self.types, value))
|
||
|
|
||
|
|
||
|
def convert_type(ty, default=None):
|
||
|
"""Converts a callable or python ty into the most appropriate param
|
||
|
ty.
|
||
|
"""
|
||
|
guessed_type = False
|
||
|
if ty is None and default is not None:
|
||
|
if isinstance(default, tuple):
|
||
|
ty = tuple(map(type, default))
|
||
|
else:
|
||
|
ty = type(default)
|
||
|
guessed_type = True
|
||
|
|
||
|
if isinstance(ty, tuple):
|
||
|
return Tuple(ty)
|
||
|
if isinstance(ty, ParamType):
|
||
|
return ty
|
||
|
if ty is text_type or ty is str or ty is None:
|
||
|
return STRING
|
||
|
if ty is int:
|
||
|
return INT
|
||
|
# Booleans are only okay if not guessed. This is done because for
|
||
|
# flags the default value is actually a bit of a lie in that it
|
||
|
# indicates which of the flags is the one we want. See get_default()
|
||
|
# for more information.
|
||
|
if ty is bool and not guessed_type:
|
||
|
return BOOL
|
||
|
if ty is float:
|
||
|
return FLOAT
|
||
|
if guessed_type:
|
||
|
return STRING
|
||
|
|
||
|
# Catch a common mistake
|
||
|
if __debug__:
|
||
|
try:
|
||
|
if issubclass(ty, ParamType):
|
||
|
raise AssertionError('Attempted to use an uninstantiated '
|
||
|
'parameter type (%s).' % ty)
|
||
|
except TypeError:
|
||
|
pass
|
||
|
return FuncParamType(ty)
|
||
|
|
||
|
|
||
|
#: A dummy parameter type that just does nothing. From a user's
|
||
|
#: perspective this appears to just be the same as `STRING` but internally
|
||
|
#: no string conversion takes place. This is necessary to achieve the
|
||
|
#: same bytes/unicode behavior on Python 2/3 in situations where you want
|
||
|
#: to not convert argument types. This is usually useful when working
|
||
|
#: with file paths as they can appear in bytes and unicode.
|
||
|
#:
|
||
|
#: For path related uses the :class:`Path` type is a better choice but
|
||
|
#: there are situations where an unprocessed type is useful which is why
|
||
|
#: it is is provided.
|
||
|
#:
|
||
|
#: .. versionadded:: 4.0
|
||
|
UNPROCESSED = UnprocessedParamType()
|
||
|
|
||
|
#: A unicode string parameter type which is the implicit default. This
|
||
|
#: can also be selected by using ``str`` as type.
|
||
|
STRING = StringParamType()
|
||
|
|
||
|
#: An integer parameter. This can also be selected by using ``int`` as
|
||
|
#: type.
|
||
|
INT = IntParamType()
|
||
|
|
||
|
#: A floating point value parameter. This can also be selected by using
|
||
|
#: ``float`` as type.
|
||
|
FLOAT = FloatParamType()
|
||
|
|
||
|
#: A boolean parameter. This is the default for boolean flags. This can
|
||
|
#: also be selected by using ``bool`` as a type.
|
||
|
BOOL = BoolParamType()
|
||
|
|
||
|
#: A UUID parameter.
|
||
|
UUID = UUIDParameterType()
|