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27 lines
627 B
Go
27 lines
627 B
Go
package jsplugin
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// asciiFold maps only 'A'–'Z' onto 'a'–'z'. Every other byte is unchanged.
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// Unicode case folding is intentionally not applied: U+212A (KELVIN SIGN)
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// must not become 'k' and impersonate an ASCII model name.
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func asciiFold(s string) string {
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var buf []byte
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for i := 0; i < len(s); i++ {
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c := s[i]
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if c >= 'A' && c <= 'Z' {
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if buf == nil {
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buf = []byte(s)
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}
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buf[i] = c + ('a' - 'A')
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}
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}
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if buf == nil {
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return s
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}
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return string(buf)
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}
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// ASCIIFold is the exported form of asciiFold for consumers outside this package.
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func ASCIIFold(s string) string {
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return asciiFold(s)
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}
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