import os import sys import stat from ._compat import open_stream, text_type, filename_to_ui, get_streerror from .exceptions import BadParameter from .utils import safecall, LazyFile class ParamType(object): """Helper for converting values through types. The following is necessary for a valid type: * it needs a name * it needs to pass through None unchanged * it needs to convert from a string * it needs to convert its result type through unchanged (eg: needs to be idempotent) * it needs to be able to deal with param and context being `None`. This can be the case when the object is used with prompt inputs. """ #: the descriptive name of this type name = None #: if a list of this type is expected and the value is pulled from a #: string environment variable, this is what splits it up. `None` #: means any whitespace. For all parameters the general rule is that #: whitespace splits them up. The exception are paths and files which #: are split by ``os.path.pathsep`` by default (":" on Unix and ";" on #: Windows). envvar_list_splitter = None def __call__(self, value, param=None, ctx=None): if value is not None: return self.convert(value, param, ctx) def get_metavar(self, param): """Returns the metavar default for this param if it provides one.""" def get_missing_message(self, param): """Optionally might return extra information about a missing parameter. .. versionadded:: 2.0 """ def convert(self, value, param, ctx): """Converts the value. This is not invoked for values that are `None` (the missing value). """ return value def split_envvar_value(self, rv): """Given a value from an environment variable this splits it up into small chunks depending on the defined envvar list splitter. If the splitter is set to `None`, which means that whitespace splits, then leading and trailing whitespace is ignored. Otherwise, leading and trailing splitters usually lead to empty items being included. """ return (rv or '').split(self.envvar_list_splitter) def fail(self, message, param=None, ctx=None): """Helper method to fail with an invalid value message.""" raise BadParameter(message, ctx=ctx, param=param) class FuncParamType(ParamType): def __init__(self, func): self.name = func.__name__ self.func = func def convert(self, value, param, ctx): try: return self.func(value) except ValueError: try: value = text_type(value) except UnicodeError: value = str(value).decode('utf-8', 'replace') self.fail(value, param, ctx) class StringParamType(ParamType): name = 'text' def convert(self, value, param, ctx): if isinstance(value, bytes): try: enc = getattr(sys.stdin, 'encoding', None) if enc is not None: value = value.decode(enc) except UnicodeError: try: value = value.decode(sys.getfilesystemencoding()) except UnicodeError: value = value.decode('utf-8', 'replace') return value return value def __repr__(self): return 'STRING' class Choice(ParamType): """The choice type allows a value to checked against a fixed set of supported values. All of these values have to be strings. See :ref:`choice-opts` for an example. """ name = 'choice' def __init__(self, choices): self.choices = choices def get_metavar(self, param): return '[%s]' % '|'.join(self.choices) def get_missing_message(self, param): return 'Choose from %s.' % ', '.join(self.choices) def convert(self, value, param, ctx): # Exact match if value in self.choices: return value # Match through normalization if ctx is not None and \ ctx.token_normalize_func is not None: value = ctx.token_normalize_func(value) for choice in self.choices: if ctx.token_normalize_func(choice) == value: return choice self.fail('invalid choice: %s. (choose from %s)' % (value, ', '.join(self.choices)), param, ctx) def __repr__(self): return 'Choice(%r)' % list(self.choices) class IntParamType(ParamType): name = 'integer' def convert(self, value, param, ctx): try: return int(value) except ValueError: self.fail('%s is not a valid integer' % value, param, ctx) def __repr__(self): return 'INT' class IntRange(IntParamType): """A parameter that works similar to :data:`click.INT` but restricts the value to fit into a range. The default behavior is to fail if the value falls outside the range, but it can also be silently clamped between the two edges. See :ref:`ranges` for an example. """ name = 'integer range' def __init__(self, min=None, max=None, clamp=False): self.min = min self.max = max self.clamp = clamp def convert(self, value, param, ctx): rv = IntParamType.convert(self, value, param, ctx) if self.clamp: if self.min is not None and rv < self.min: return self.min if self.max is not None and rv > self.max: return self.max if self.min is not None and rv < self.min or \ self.max is not None and rv > self.max: if self.min is None: self.fail('%s is bigger than the maximum valid value ' '%s.' % (rv, self.max), param, ctx) elif self.max is None: self.fail('%s is smaller than the minimum valid value ' '%s.' % (rv, self.min), param, ctx) else: self.fail('%s is not in the valid range of %s to %s.' % (rv, self.min, self.max), param, ctx) return rv def __repr__(self): return 'IntRange(%r, %r)' % (self.min, self.max) class BoolParamType(ParamType): name = 'boolean' def convert(self, value, param, ctx): if isinstance(value, bool): return bool(value) value = value.lower() if value in ('true', '1', 'yes', 'y'): return True elif value in ('false', '0', 'no', 'n'): return False self.fail('%s is not a valid boolean' % value, param, ctx) def __repr__(self): return 'BOOL' class FloatParamType(ParamType): name = 'float' def convert(self, value, param, ctx): try: return float(value) except ValueError: self.fail('%s is not a valid floating point value' % value, param, ctx) def __repr__(self): return 'FLOAT' class UUIDParameterType(ParamType): name = 'uuid' def convert(self, value, param, ctx): import uuid try: return uuid.UUID(value) except ValueError: self.fail('%s is not a valid UUID value' % value, param, ctx) def __repr__(self): return 'UUID' class File(ParamType): """Declares a parameter to be a file for reading or writing. The file is automatically closed once the context tears down (after the command finished working). Files can be opened for reading or writing. The special value ``-`` indicates stdin or stdout depending on the mode. By default, the file is opened for reading text data, but it can also be opened in binary mode or for writing. The encoding parameter can be used 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. Starting with Click 2.0, files can also be opened atomically in which 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 a open file handle it returns just the filename. Secondly, it can perform various basic checks about what the file or directory should be. :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. """ envvar_list_splitter = os.path.pathsep def __init__(self, exists=False, file_okay=True, dir_okay=True, writable=False, readable=True, resolve_path=False): self.exists = exists self.file_okay = file_okay self.dir_okay = dir_okay self.writable = writable self.readable = readable self.resolve_path = resolve_path if self.file_okay and not self.dir_okay: self.name = 'file' self.path_type = 'File' if self.dir_okay and not self.file_okay: self.name = 'directory' self.path_type = 'Directory' else: self.name = 'path' self.path_type = 'Path' def convert(self, value, param, ctx): rv = value if self.resolve_path: rv = os.path.realpath(rv) try: st = os.stat(rv) except OSError: if not self.exists: return 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 rv def convert_type(ty, default=None): """Converts a callable or python ty into the most appropriate param ty. """ if isinstance(ty, ParamType): return ty guessed_type = False if ty is None and default is not None: ty = type(default) guessed_type = True 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 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()