146 lines
4.1 KiB
Python
146 lines
4.1 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (C) 2022 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License."""
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"""Helper functions and types for command processing for difftool."""
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class CommandInfo:
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"""Contains information about an action commandline."""
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def __init__(self, tool, args):
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self.tool = tool
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self.args = args
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def __str__(self):
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s = "CommandInfo:\n"
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s += " Tool:\n"
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s += " " + self.tool + "\n"
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s += " Args:\n"
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for x in self.args:
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s += " " + x + "\n"
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return s
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def parse_flag_groups(args, custom_flag_group=None):
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"""Returns a list of flag groups based on the given args.
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An arg group consists of one-arg flags, two-arg groups, or positional args.
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Positional arguments (for example `a.out`) are returned as strings in the
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list.
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One-arg groups consist of a flag with no argument (for example, `--verbose`),
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and are returned as a tuple of size one in the list.
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Two-arg groups consist of a flag with a single argument (for example,
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`--file bar.txt` or `--mode=verbose`),
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and are returned as a tuple of size two in the list.
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Also accepts an optional function `custom_flag_group` to determine if a
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single arg comprises a group. (custom_flag_group(x) should return a flag
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group abiding by the above convention, or None to use non-custom logic.
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This may be required to accurately parse arg groups. For example, `-a b` may
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be either a one-arg group `-a` followed by a positonal group `b`, or a two-arg
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group `-a b`."""
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flag_groups = []
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i = 0
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while i < len(args):
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if custom_flag_group:
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g = custom_flag_group(args[i])
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if g is not None:
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flag_groups += [g]
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i += 1
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continue
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g = one_arg_group(args[i])
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if g is not None:
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flag_groups += [g]
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i += 1
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continue
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# Look for a two-arg group if there are at least 2 elements left.
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if i < len(args) - 1:
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g = two_arg_group(args[i], args[i+1])
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if g is not None:
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flag_groups += [g]
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i += 2
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continue
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# Not a recognized one arg group or two arg group.
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if args[i].startswith("-"):
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flag_groups += [(args[i])]
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else:
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flag_groups += [args[i]]
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i += 1
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return flag_groups
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def remove_hyphens(x):
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"""Returns the given string with leading '--' or '-' removed."""
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if x.startswith("--"):
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return x[2:]
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elif x.startswith("-"):
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return x[1:]
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else:
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return x
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def two_arg_group(a, b):
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"""Determines whether two consecutive args belong to a single flag group.
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Two arguments belong to a single flag group if the first arg contains
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a hyphen and the second does not. For example: `-foo bar` is a flag,
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but `foo bar` and `--foo --bar` are not.
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Returns:
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A tuple of the two args without hyphens if they belong to a single
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flag, or None if they do not. """
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if a.startswith("-") and (not b.startswith("-")):
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return (remove_hyphens(a), b)
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else:
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return None
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def one_arg_group(x):
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"""Determines whether an arg comprises a complete flag group.
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An argument comprises a single flag group if it is of the form of
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`-key=value` or `--key=value`.
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Returns:
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A tuple of `(key, value)` of the flag group, if the arg comprises a
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complete flag group, or None if it does not."""
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tokens = x.split("=")
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if len(tokens) == 2:
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return (remove_hyphens(tokens[0]), tokens[1])
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else:
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return None
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def is_flag_starts_with(prefix, x):
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if isinstance(x, tuple):
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return x[0].startswith(prefix)
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else:
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return x.startswith("--" + prefix) or x.startswith("-" + prefix)
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def flag_repr(x):
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if isinstance(x, tuple):
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return f"-{x[0]} {x[1]}"
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else:
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return x
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