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