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+"""Functions brought over from jaraco.text.
+
+These functions are not supposed to be used within `pip._internal`. These are
+helper functions brought over from `jaraco.text` to enable vendoring newer
+copies of `pkg_resources` without having to vendor `jaraco.text` and its entire
+dependency cone; something that our vendoring setup is not currently capable of
+handling.
+
+License reproduced from original source below:
+
+Copyright Jason R. Coombs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.
+"""
+
+import functools
+import itertools
+
+
+def _nonblank(str):
+ return str and not str.startswith("#")
+
+
+@functools.singledispatch
+def yield_lines(iterable):
+ r"""
+ Yield valid lines of a string or iterable.
+
+ >>> list(yield_lines(''))
+ []
+ >>> list(yield_lines(['foo', 'bar']))
+ ['foo', 'bar']
+ >>> list(yield_lines('foo\nbar'))
+ ['foo', 'bar']
+ >>> list(yield_lines('\nfoo\n#bar\nbaz #comment'))
+ ['foo', 'baz #comment']
+ >>> list(yield_lines(['foo\nbar', 'baz', 'bing\n\n\n']))
+ ['foo', 'bar', 'baz', 'bing']
+ """
+ return itertools.chain.from_iterable(map(yield_lines, iterable))
+
+
+@yield_lines.register(str)
+def _(text):
+ return filter(_nonblank, map(str.strip, text.splitlines()))
+
+
+def drop_comment(line):
+ """
+ Drop comments.
+
+ >>> drop_comment('foo # bar')
+ 'foo'
+
+ A hash without a space may be in a URL.
+
+ >>> drop_comment('http://example.com/foo#bar')
+ 'http://example.com/foo#bar'
+ """
+ return line.partition(" #")[0]
+
+
+def join_continuation(lines):
+ r"""
+ Join lines continued by a trailing backslash.
+
+ >>> list(join_continuation(['foo \\', 'bar', 'baz']))
+ ['foobar', 'baz']
+ >>> list(join_continuation(['foo \\', 'bar', 'baz']))
+ ['foobar', 'baz']
+ >>> list(join_continuation(['foo \\', 'bar \\', 'baz']))
+ ['foobarbaz']
+
+ Not sure why, but...
+ The character preceding the backslash is also elided.
+
+ >>> list(join_continuation(['goo\\', 'dly']))
+ ['godly']
+
+ A terrible idea, but...
+ If no line is available to continue, suppress the lines.
+
+ >>> list(join_continuation(['foo', 'bar\\', 'baz\\']))
+ ['foo']
+ """
+ lines = iter(lines)
+ for item in lines:
+ while item.endswith("\\"):
+ try:
+ item = item[:-2].strip() + next(lines)
+ except StopIteration:
+ return
+ yield item