mirror of https://github.com/zellyn/diskii.git
36 lines
761 B
Go
36 lines
761 B
Go
// Package basic contains routines useful for both Applesoft and
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// Integer BASIC.
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package basic
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import "regexp"
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var controlCharRegexp = regexp.MustCompile(`[\x00-\x1F]`)
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// ChevronControlCodes converts ASCII control characters like chr(4)
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// to chevron-surrounded codes like «ctrl-D».
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func ChevronControlCodes(s string) string {
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return controlCharRegexp.ReplaceAllStringFunc(s, func(s string) string {
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if s == "\n" || s == "\t" {
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return s
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}
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if s >= "\x01" && s <= "\x1a" {
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return "«ctrl-" + string('A'-1+s[0]) + "»"
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}
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code := "?"
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switch s[0] {
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case '\x00':
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code = "NUL"
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case '\x1C':
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code = "FS"
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case '\x1D':
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code = "GS"
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case '\x1E':
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code = "RS"
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case '\x1F':
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code = "US"
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}
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return "«" + code + "»"
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})
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}
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