26 lines
639 B
Go
26 lines
639 B
Go
package unilex
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// ScanNumber simplest scanner that accepts decimal int and float.
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func ScanNumber(l *Lexer) bool {
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l.AcceptWhile("0123456789")
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if l.AtStart() {
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// not found any digit
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return false
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}
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l.Accept(".")
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l.AcceptWhile("0123456789")
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return !l.AtStart()
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}
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// ScanAlphaNum returns true if next input token contains alphanum sequence that not starts from digit and not contains.
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// spaces or special characters.
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func ScanAlphaNum(l *Lexer) bool {
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digits := "0123456789"
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alpha := "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"
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if !l.Accept(alpha) {
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return false
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}
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l.AcceptWhile(alpha + digits)
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return true
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}
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