40 lines
741 B
Go
40 lines
741 B
Go
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package reader
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import "time"
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const (
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MinWPM = 100
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MaxWPM = 1000
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)
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// WordDuration calculates how long a word should be displayed
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// at the specified reading speed.
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func WordDuration(word string, wpm int) time.Duration {
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// Enforce supported reading speed limits.
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if wpm < MinWPM {
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wpm = MinWPM
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}
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if wpm > MaxWPM {
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wpm = MaxWPM
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}
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// Base duration for one word.
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duration := time.Minute / time.Duration(wpm)
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// Add pauses for punctuation.
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switch {
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case IsSentenceEnding(word):
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duration += 300 * time.Millisecond
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case IsPausePunctuation(word):
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duration += 150 * time.Millisecond
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}
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// Allow slightly more time for longer words.
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if RuneLength(word) >= 10 {
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duration += 50 * time.Millisecond
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}
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return duration
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}
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