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// Package syllables provides a Go implementation of
// the syllable counter from `github.com/wooorm/syllable`
package syllables
import (
"strings"
)
type counter struct {
count, index, length int
singular string
parts []string
}
// Returns the integer count of syllables in the input byte array.
func InBytes(b []byte) int {
s := string(b[:len(b)])
return In(s)
}
// Returns the integer count of syllables in the input string.
func In(text string) int {
// Prepare input text by converting to lowercase
// and removing all non-alphabetic runes
text = strings.ToLower(text)
text = expressionNonalphabetic.ReplaceAllString(text, "")
// Return early when possible
if len(text) < 1 {
return 0
}
if len(text) < 3 {
return 1
}
// If value is part of cornercases,
// return hardcoded value
if syllables, ok := cornercases[text]; ok {
return syllables
}
// Initialize counter
c := counter{}
// Count and remove matched prefixes and suffixes
text = expressionTriple.ReplaceAllStringFunc(text, c.countAndRemove(3))
text = expressionDouble.ReplaceAllStringFunc(text, c.countAndRemove(2))
text = expressionSingle.ReplaceAllStringFunc(text, c.countAndRemove(1))
// Count multiple consanants
c.parts = consanants.Split(text, -1)
c.index = 0
c.length = len(c.parts)
for ; c.index < c.length; c.index++ {
if c.parts[c.index] != "" {
c.count++
}
}
// Subtract one for maches which should be
// counted as one but are counted as two
subtractOne := c.countInPlace(-1)
expressionMonosyllabicOne.ReplaceAllStringFunc(text, subtractOne)
expressionMonosyllabicTwo.ReplaceAllStringFunc(text, subtractOne)
// Add one for maches which should be
// counted as two but are counted as one
addOne := c.countInPlace(1)
expressionDoubleSyllabicOne.ReplaceAllStringFunc(text, addOne)
expressionDoubleSyllabicTwo.ReplaceAllStringFunc(text, addOne)
expressionDoubleSyllabicThree.ReplaceAllStringFunc(text, addOne)
expressionDoubleSyllabicFour.ReplaceAllStringFunc(text, addOne)
if c.count < 1 {
return 1
}
return c.count
}
func (c *counter) countAndRemove(increment int) func(string) string {
return func(in string) string {
c.count += increment
return ""
}
}
func (c *counter) countInPlace(increment int) func(string) string {
return func(in string) string {
c.count += increment
return in
}
}
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