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mycorrhiza/markup/hr.go

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package markup
import (
"unicode"
)
// MatchesHorizontalLine checks if the string can be interpreted as suitable for rendering as <hr/>.
//
// The rule is: if there are more than 4 characters "-" in the string, then make it a horizontal line.
// Otherwise it is a paragraph (<p>).
func MatchesHorizontalLine(line string) bool {
counter := 0
// Check initially that the symbol is "-". If it is not a "-", it is most likely a space or another character.
// With unicode.IsLetter() we can separate spaces and characters.
for _, ch := range line {
if ch == '-' {
counter++
continue
}
// If we bump into any other character (letter) in the line, it is immediately an incorrect horizontal line.
// There is no point in counting further, we end the loop.
if unicode.IsLetter(ch) {
counter = 0
break
}
}
if counter >= 4 {
return true
}
return false
}