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427 lines
15 KiB
Python
427 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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"""
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click.parser
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~~~~~~~~~~~~
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This module started out as largely a copy paste from the stdlib's
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optparse module with the features removed that we do not need from
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optparse because we implement them in Click on a higher level (for
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instance type handling, help formatting and a lot more).
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The plan is to remove more and more from here over time.
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The reason this is a different module and not optparse from the stdlib
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is that there are differences in 2.x and 3.x about the error messages
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generated and optparse in the stdlib uses gettext for no good reason
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and might cause us issues.
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"""
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import re
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from collections import deque
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from .exceptions import UsageError, NoSuchOption, BadOptionUsage, \
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BadArgumentUsage
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def _unpack_args(args, nargs_spec):
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"""Given an iterable of arguments and an iterable of nargs specifications,
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it returns a tuple with all the unpacked arguments at the first index
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and all remaining arguments as the second.
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The nargs specification is the number of arguments that should be consumed
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or `-1` to indicate that this position should eat up all the remainders.
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Missing items are filled with `None`.
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"""
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args = deque(args)
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nargs_spec = deque(nargs_spec)
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rv = []
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spos = None
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def _fetch(c):
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try:
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if spos is None:
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return c.popleft()
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else:
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return c.pop()
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except IndexError:
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return None
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while nargs_spec:
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nargs = _fetch(nargs_spec)
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if nargs == 1:
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rv.append(_fetch(args))
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elif nargs > 1:
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x = [_fetch(args) for _ in range(nargs)]
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# If we're reversed, we're pulling in the arguments in reverse,
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# so we need to turn them around.
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if spos is not None:
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x.reverse()
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rv.append(tuple(x))
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elif nargs < 0:
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if spos is not None:
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raise TypeError('Cannot have two nargs < 0')
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spos = len(rv)
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rv.append(None)
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# spos is the position of the wildcard (star). If it's not `None`,
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# we fill it with the remainder.
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if spos is not None:
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rv[spos] = tuple(args)
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args = []
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rv[spos + 1:] = reversed(rv[spos + 1:])
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return tuple(rv), list(args)
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def _error_opt_args(nargs, opt):
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if nargs == 1:
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raise BadOptionUsage('%s option requires an argument' % opt)
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raise BadOptionUsage('%s option requires %d arguments' % (opt, nargs))
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def split_opt(opt):
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first = opt[:1]
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if first.isalnum():
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return '', opt
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if opt[1:2] == first:
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return opt[:2], opt[2:]
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return first, opt[1:]
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def normalize_opt(opt, ctx):
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if ctx is None or ctx.token_normalize_func is None:
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return opt
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prefix, opt = split_opt(opt)
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return prefix + ctx.token_normalize_func(opt)
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def split_arg_string(string):
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"""Given an argument string this attempts to split it into small parts."""
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rv = []
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for match in re.finditer(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
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r'|"([^"\\]*(?:\\.[^"\\]*)*)"'
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r'|\S+)\s*', string, re.S):
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arg = match.group().strip()
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if arg[:1] == arg[-1:] and arg[:1] in '"\'':
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arg = arg[1:-1].encode('ascii', 'backslashreplace') \
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.decode('unicode-escape')
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try:
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arg = type(string)(arg)
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except UnicodeError:
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pass
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rv.append(arg)
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return rv
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class Option(object):
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def __init__(self, opts, dest, action=None, nargs=1, const=None, obj=None):
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self._short_opts = []
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self._long_opts = []
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self.prefixes = set()
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for opt in opts:
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prefix, value = split_opt(opt)
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if not prefix:
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raise ValueError('Invalid start character for option (%s)'
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% opt)
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self.prefixes.add(prefix[0])
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if len(prefix) == 1 and len(value) == 1:
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self._short_opts.append(opt)
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else:
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self._long_opts.append(opt)
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self.prefixes.add(prefix)
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if action is None:
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action = 'store'
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self.dest = dest
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self.action = action
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self.nargs = nargs
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self.const = const
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self.obj = obj
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@property
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def takes_value(self):
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return self.action in ('store', 'append')
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def process(self, value, state):
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if self.action == 'store':
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state.opts[self.dest] = value
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elif self.action == 'store_const':
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state.opts[self.dest] = self.const
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elif self.action == 'append':
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state.opts.setdefault(self.dest, []).append(value)
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elif self.action == 'append_const':
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state.opts.setdefault(self.dest, []).append(self.const)
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elif self.action == 'count':
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state.opts[self.dest] = state.opts.get(self.dest, 0) + 1
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else:
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raise ValueError('unknown action %r' % self.action)
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state.order.append(self.obj)
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class Argument(object):
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def __init__(self, dest, nargs=1, obj=None):
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self.dest = dest
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self.nargs = nargs
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self.obj = obj
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def process(self, value, state):
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if self.nargs > 1:
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holes = sum(1 for x in value if x is None)
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if holes == len(value):
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value = None
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elif holes != 0:
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raise BadArgumentUsage('argument %s takes %d values'
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% (self.dest, self.nargs))
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state.opts[self.dest] = value
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state.order.append(self.obj)
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class ParsingState(object):
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def __init__(self, rargs):
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self.opts = {}
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self.largs = []
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self.rargs = rargs
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self.order = []
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class OptionParser(object):
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"""The option parser is an internal class that is ultimately used to
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parse options and arguments. It's modelled after optparse and brings
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a similar but vastly simplified API. It should generally not be used
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directly as the high level Click classes wrap it for you.
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It's not nearly as extensible as optparse or argparse as it does not
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implement features that are implemented on a higher level (such as
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types or defaults).
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:param ctx: optionally the :class:`~click.Context` where this parser
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should go with.
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"""
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def __init__(self, ctx=None):
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#: The :class:`~click.Context` for this parser. This might be
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#: `None` for some advanced use cases.
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self.ctx = ctx
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#: This controls how the parser deals with interspersed arguments.
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#: If this is set to `False`, the parser will stop on the first
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#: non-option. Click uses this to implement nested subcommands
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#: safely.
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self.allow_interspersed_args = True
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#: This tells the parser how to deal with unknown options. By
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#: default it will error out (which is sensible), but there is a
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#: second mode where it will ignore it and continue processing
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#: after shifting all the unknown options into the resulting args.
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self.ignore_unknown_options = False
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if ctx is not None:
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self.allow_interspersed_args = ctx.allow_interspersed_args
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self.ignore_unknown_options = ctx.ignore_unknown_options
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self._short_opt = {}
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self._long_opt = {}
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self._opt_prefixes = set(['-', '--'])
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self._args = []
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def add_option(self, opts, dest, action=None, nargs=1, const=None,
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obj=None):
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"""Adds a new option named `dest` to the parser. The destination
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is not inferred (unlike with optparse) and needs to be explicitly
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provided. Action can be any of ``store``, ``store_const``,
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``append``, ``appnd_const`` or ``count``.
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The `obj` can be used to identify the option in the order list
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that is returned from the parser.
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"""
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if obj is None:
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obj = dest
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opts = [normalize_opt(opt, self.ctx) for opt in opts]
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option = Option(opts, dest, action=action, nargs=nargs,
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const=const, obj=obj)
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self._opt_prefixes.update(option.prefixes)
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for opt in option._short_opts:
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self._short_opt[opt] = option
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for opt in option._long_opts:
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self._long_opt[opt] = option
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def add_argument(self, dest, nargs=1, obj=None):
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"""Adds a positional argument named `dest` to the parser.
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The `obj` can be used to identify the option in the order list
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that is returned from the parser.
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"""
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if obj is None:
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obj = dest
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self._args.append(Argument(dest=dest, nargs=nargs, obj=obj))
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def parse_args(self, args):
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"""Parses positional arguments and returns ``(values, args, order)``
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for the parsed options and arguments as well as the leftover
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arguments if there are any. The order is a list of objects as they
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appear on the command line. If arguments appear multiple times they
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will be memorized multiple times as well.
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"""
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state = ParsingState(args)
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try:
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self._process_args_for_options(state)
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self._process_args_for_args(state)
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except UsageError:
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if self.ctx is None or not self.ctx.resilient_parsing:
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raise
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return state.opts, state.largs, state.order
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def _process_args_for_args(self, state):
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pargs, args = _unpack_args(state.largs + state.rargs,
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[x.nargs for x in self._args])
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for idx, arg in enumerate(self._args):
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arg.process(pargs[idx], state)
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state.largs = args
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state.rargs = []
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def _process_args_for_options(self, state):
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while state.rargs:
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arg = state.rargs.pop(0)
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arglen = len(arg)
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# Double dashes always handled explicitly regardless of what
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# prefixes are valid.
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if arg == '--':
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return
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elif arg[:1] in self._opt_prefixes and arglen > 1:
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self._process_opts(arg, state)
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elif self.allow_interspersed_args:
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state.largs.append(arg)
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else:
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state.rargs.insert(0, arg)
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return
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# Say this is the original argument list:
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# [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
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# ^
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# (we are about to process arg(i)).
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#
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# Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
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# [arg0, ..., arg(i-1)] (any options and their arguments will have
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# been removed from largs).
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#
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# The while loop will usually consume 1 or more arguments per pass.
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# If it consumes 1 (eg. arg is an option that takes no arguments),
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# then after _process_arg() is done the situation is:
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#
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# largs = subset of [arg0, ..., arg(i)]
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# rargs = [arg(i+1), ..., arg(N-1)]
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#
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# If allow_interspersed_args is false, largs will always be
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# *empty* -- still a subset of [arg0, ..., arg(i-1)], but
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# not a very interesting subset!
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def _match_long_opt(self, opt, explicit_value, state):
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if opt not in self._long_opt:
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possibilities = [word for word in self._long_opt
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if word.startswith(opt)]
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raise NoSuchOption(opt, possibilities=possibilities)
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option = self._long_opt[opt]
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if option.takes_value:
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# At this point it's safe to modify rargs by injecting the
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# explicit value, because no exception is raised in this
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# branch. This means that the inserted value will be fully
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# consumed.
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if explicit_value is not None:
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state.rargs.insert(0, explicit_value)
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nargs = option.nargs
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if len(state.rargs) < nargs:
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_error_opt_args(nargs, opt)
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elif nargs == 1:
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value = state.rargs.pop(0)
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else:
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value = tuple(state.rargs[:nargs])
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del state.rargs[:nargs]
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elif explicit_value is not None:
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raise BadOptionUsage('%s option does not take a value' % opt)
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else:
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value = None
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option.process(value, state)
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def _match_short_opt(self, arg, state):
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stop = False
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i = 1
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prefix = arg[0]
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unknown_options = []
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for ch in arg[1:]:
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opt = normalize_opt(prefix + ch, self.ctx)
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option = self._short_opt.get(opt)
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i += 1
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if not option:
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if self.ignore_unknown_options:
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unknown_options.append(ch)
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continue
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raise NoSuchOption(opt)
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if option.takes_value:
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# Any characters left in arg? Pretend they're the
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# next arg, and stop consuming characters of arg.
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if i < len(arg):
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state.rargs.insert(0, arg[i:])
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stop = True
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nargs = option.nargs
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if len(state.rargs) < nargs:
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_error_opt_args(nargs, opt)
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elif nargs == 1:
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value = state.rargs.pop(0)
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else:
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value = tuple(state.rargs[:nargs])
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del state.rargs[:nargs]
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else:
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value = None
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option.process(value, state)
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if stop:
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break
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# If we got any unknown options we re-combinate the string of the
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# remaining options and re-attach the prefix, then report that
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# to the state as new larg. This way there is basic combinatorics
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# that can be achieved while still ignoring unknown arguments.
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if self.ignore_unknown_options and unknown_options:
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state.largs.append(prefix + ''.join(unknown_options))
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def _process_opts(self, arg, state):
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explicit_value = None
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# Long option handling happens in two parts. The first part is
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# supporting explicitly attached values. In any case, we will try
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# to long match the option first.
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if '=' in arg:
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long_opt, explicit_value = arg.split('=', 1)
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else:
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long_opt = arg
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norm_long_opt = normalize_opt(long_opt, self.ctx)
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# At this point we will match the (assumed) long option through
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# the long option matching code. Note that this allows options
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# like "-foo" to be matched as long options.
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try:
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self._match_long_opt(norm_long_opt, explicit_value, state)
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except NoSuchOption:
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# At this point the long option matching failed, and we need
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# to try with short options. However there is a special rule
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# which says, that if we have a two character options prefix
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# (applies to "--foo" for instance), we do not dispatch to the
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# short option code and will instead raise the no option
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# error.
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if arg[:2] not in self._opt_prefixes:
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return self._match_short_opt(arg, state)
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if not self.ignore_unknown_options:
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raise
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state.largs.append(arg)
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