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package glob
import "strings"
// The character which is treated like a glob
const GLOB = "*"
// Glob will test a string pattern, potentially containing globs, against a
// subject string. The result is a simple true/false, determining whether or
// not the glob pattern matched the subject text.
func Glob(pattern, subj string) bool {
// Empty pattern can only match empty subject
if pattern == "" {
return subj == pattern
}
// If the pattern _is_ a glob, it matches everything
if pattern == GLOB {
return true
}
parts := strings.Split(pattern, GLOB)
if len(parts) == 1 {
// No globs in pattern, so test for equality
return subj == pattern
}
leadingGlob := strings.HasPrefix(pattern, GLOB)
trailingGlob := strings.HasSuffix(pattern, GLOB)
end := len(parts) - 1
// Go over the leading parts and ensure they match.
for i := 0; i < end; i++ {
idx := strings.Index(subj, parts[i])
switch i {
case 0:
// Check the first section. Requires special handling.
if !leadingGlob && idx != 0 {
return false
}
default:
// Check that the middle parts match.
if idx < 0 {
return false
}
}
// Trim evaluated text from subj as we loop over the pattern.
subj = subj[idx+len(parts[i]):]
}
// Reached the last section. Requires special handling.
return trailingGlob || strings.HasSuffix(subj, parts[end])
}
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