87 lines
1.9 KiB
V
87 lines
1.9 KiB
V
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module os
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// Collection of useful functions for manipulation, validation and analysis of system paths.
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// The following functions handle paths depending on the operating system,
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// therefore results may be different for certain operating systems.
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const (
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fslash = `/`
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bslash = `\\`
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dot = `.`
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)
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// is_abs_path returns `true` if the given `path` is absolute.
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pub fn is_abs_path(path string) bool {
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if path.len == 0 {
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return false
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}
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$if windows {
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return is_device_path(path) || is_drive_rooted(path) || is_normal_path(path)
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}
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return path[0] == os.fslash
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}
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// win_volume_len returns the length of the
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// Windows volume/drive from the given `path`.
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fn win_volume_len(path string) int {
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plen := path.len
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if plen < 2 {
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return 0
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}
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if has_drive_letter(path) {
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return 2
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}
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// its UNC path / DOS device path?
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if path.len >= 5 && starts_w_slash_slash(path) && !is_slash(path[2]) {
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for i := 3; i < plen; i++ {
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if is_slash(path[i]) {
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if i + 1 >= plen || is_slash(path[i + 1]) {
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break
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}
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i++
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for ; i < plen; i++ {
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if is_slash(path[i]) {
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return i
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}
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}
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return i
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}
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}
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}
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return 0
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}
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fn is_slash(b u8) bool {
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$if windows {
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return b == os.bslash || b == os.fslash
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}
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return b == os.fslash
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}
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fn is_device_path(path string) bool {
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return win_volume_len(path) >= 5 && starts_w_slash_slash(path)
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}
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fn has_drive_letter(path string) bool {
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return path.len >= 2 && path[0].is_letter() && path[1] == `:`
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}
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fn starts_w_slash_slash(path string) bool {
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return path.len >= 2 && is_slash(path[0]) && is_slash(path[1])
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}
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fn is_drive_rooted(path string) bool {
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return path.len >= 3 && has_drive_letter(path) && is_slash(path[2])
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}
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// is_normal_path returns `true` if the given
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// `path` is NOT a network or Windows device path.
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fn is_normal_path(path string) bool {
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plen := path.len
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if plen == 0 {
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return false
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}
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return (plen == 1 && is_slash(path[0])) || (plen >= 2 && is_slash(path[0])
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&& !is_slash(path[1]))
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}
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