39 lines
1.7 KiB
Racket
39 lines
1.7 KiB
Racket
#lang scribble/doc
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@(require scribble/bnf
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"mz.ss")
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@title[#:tag "unixpaths"]{@|AllUnix| Paths}
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In @|AllUnix| paths, a @litchar{/} separates elements of the path,
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@litchar{.} as a path element always means the directory indicated by
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preceding path, and @litchar{..} as a path element always means the
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parent of the directory indicated by the preceding path. A leading
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@litchar{~} in a path is not treated specially, but
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@scheme[expand-user-path] can be used to convert a leading @litchar{~}
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element to a user-specific directory. No other character or byte has a
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special meaning within a path. Multiple adjacent @litchar{/} are
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equivalent to a single @litchar{/} (i.e., they act as a single path
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separator).
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A path root is always @litchar{/}. A path starting with @litchar{/} is
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an absolute, complete path, and a path starting with any other
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character is a relative path.
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Any pathname that ends with a @litchar{/} syntactically refers to a
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directory, as does any path whose last element is @litchar{.} or
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@litchar{..}.
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A @|AllUnix| path is @techlink{cleanse}d by replacing multiple adjacent
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@litchar{/}s with a single @litchar{/}.
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For @scheme[(bytes->path-element _bstr)], @scheme[bstr] must not
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contain any @litchar{/}, otherwise the @exnraise[exn:fail:contract].
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The result of @scheme[(path-element->bytes _path)] or
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@scheme[(path-element->string _path)] is always the same as the result
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of @scheme[(path->bytes _path)] and @scheme[(path->string
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_path)]. Since that is not the case for other platforms, however,
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@scheme[path-element->bytes] and @scheme[path-element->string] should
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be used when converting individual path elements.
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Under Mac OS X, Finder aliases are zero-length files.
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