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Don't treat BOM escape sequence as hidden character. (#18909)
* Don't treat BOM escape sequence as hidden character. - BOM sequence is a common non-harmfull escape sequence, it shouldn't be shown as hidden character. - Follows GitHub's behavior. - Resolves #18837 Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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@@ -63,6 +63,7 @@ func EscapeControlBytes(text []byte) (EscapeStatus, []byte) {
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func EscapeControlReader(text io.Reader, output io.Writer) (escaped EscapeStatus, err error) {
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buf := make([]byte, 4096)
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readStart := 0
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runeCount := 0
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var n int
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var writePos int
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@@ -79,6 +80,8 @@ readingloop:
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for i < len(bs) {
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r, size := utf8.DecodeRune(bs[i:])
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runeCount++
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// Now handle the codepoints
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switch {
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case r == utf8.RuneError:
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@@ -113,6 +116,8 @@ readingloop:
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lineHasRTLScript = false
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lineHasLTRScript = false
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case runeCount == 1 && r == 0xFEFF: // UTF BOM
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// the first BOM is safe
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case r == '\r' || r == '\t' || r == ' ':
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// These are acceptable control characters and space characters
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case unicode.IsSpace(r):
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