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49 lines
1.7 KiB
Go
49 lines
1.7 KiB
Go
package filepath
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import (
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"regexp"
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"strings"
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)
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var windowsAbs = regexp.MustCompile(`^[a-zA-Z]:\\.*$`)
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// Abs is a version of path/filepath's Abs with an explicit operating
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// system and current working directory.
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func Abs(os, path, cwd string) (_ string, err error) {
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if IsAbs(os, path) {
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return Clean(os, path), nil
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}
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return Clean(os, Join(os, cwd, path)), nil
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}
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// IsAbs is a version of path/filepath's IsAbs with an explicit
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// operating system.
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func IsAbs(os, path string) bool {
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if os == "windows" {
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// FIXME: copy hideous logic from Go's
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// src/path/filepath/path_windows.go into somewhere where we can
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// put 3-clause BSD licensed code.
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return windowsAbs.MatchString(path)
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}
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sep := Separator(os)
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// POSIX has [1]:
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//
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// > If a pathname begins with two successive <slash> characters,
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// > the first component following the leading <slash> characters
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// > may be interpreted in an implementation-defined manner,
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// > although more than two leading <slash> characters shall be
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// > treated as a single <slash> character.
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//
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// And Boost treats // as non-absolute [2], but Linux [3,4], Python
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// [5] and Go [6] all treat // as absolute.
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//
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// [1]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13
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// [2]: https://github.com/boostorg/filesystem/blob/boost-1.64.0/test/path_test.cpp#L861
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// [3]: http://man7.org/linux/man-pages/man7/path_resolution.7.html
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// [4]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/filesystems/path-lookup.md?h=v4.12#n41
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// [5]: https://github.com/python/cpython/blob/v3.6.1/Lib/posixpath.py#L64-L66
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// [6]: https://go.googlesource.com/go/+/go1.8.3/src/path/path.go#199
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return strings.HasPrefix(path, string(sep))
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}
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