839 lines
16 KiB
Go
839 lines
16 KiB
Go
package porterstemmer
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import (
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// "log"
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"unicode"
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)
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func isConsonant(s []rune, i int) bool {
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//DEBUG
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//log.Printf("isConsonant: [%+v]", string(s[i]))
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result := true
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switch s[i] {
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case 'a', 'e', 'i', 'o', 'u':
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result = false
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case 'y':
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if 0 == i {
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result = true
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} else {
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result = !isConsonant(s, i-1)
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}
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default:
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result = true
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}
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return result
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}
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func measure(s []rune) uint {
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// Initialize.
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lenS := len(s)
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result := uint(0)
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i := 0
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// Short Circuit.
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if 0 == lenS {
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/////////// RETURN
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return result
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}
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// Ignore (potential) consonant sequence at the beginning of word.
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for isConsonant(s, i) {
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//DEBUG
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//log.Printf("[measure([%s])] Eat Consonant [%d] -> [%s]", string(s), i, string(s[i]))
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i++
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if i >= lenS {
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/////////////// RETURN
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return result
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}
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}
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// For each pair of a vowel sequence followed by a consonant sequence, increment result.
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Outer:
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for i < lenS {
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for !isConsonant(s, i) {
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//DEBUG
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//log.Printf("[measure([%s])] VOWEL [%d] -> [%s]", string(s), i, string(s[i]))
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i++
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if i >= lenS {
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/////////// BREAK
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break Outer
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}
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}
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for isConsonant(s, i) {
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//DEBUG
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//log.Printf("[measure([%s])] CONSONANT [%d] -> [%s]", string(s), i, string(s[i]))
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i++
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if i >= lenS {
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result++
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/////////// BREAK
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break Outer
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}
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}
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result++
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}
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// Return
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return result
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}
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func hasSuffix(s, suffix []rune) bool {
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lenSMinusOne := len(s) - 1
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lenSuffixMinusOne := len(suffix) - 1
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if lenSMinusOne <= lenSuffixMinusOne {
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return false
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} else if s[lenSMinusOne] != suffix[lenSuffixMinusOne] { // I suspect checking this first should speed this function up in practice.
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/////// RETURN
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return false
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} else {
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for i := 0; i < lenSuffixMinusOne; i++ {
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if suffix[i] != s[lenSMinusOne-lenSuffixMinusOne+i] {
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/////////////// RETURN
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return false
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}
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}
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}
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return true
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}
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func containsVowel(s []rune) bool {
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lenS := len(s)
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for i := 0; i < lenS; i++ {
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if !isConsonant(s, i) {
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/////////// RETURN
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return true
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}
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}
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return false
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}
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func hasRepeatDoubleConsonantSuffix(s []rune) bool {
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// Initialize.
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lenS := len(s)
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result := false
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// Do it!
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if 2 > lenS {
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result = false
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} else if s[lenS-1] == s[lenS-2] && isConsonant(s, lenS-1) { // Will using isConsonant() cause a problem with "YY"?
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result = true
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} else {
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result = false
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}
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// Return,
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return result
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}
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func hasConsonantVowelConsonantSuffix(s []rune) bool {
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// Initialize.
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lenS := len(s)
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result := false
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// Do it!
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if 3 > lenS {
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result = false
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} else if isConsonant(s, lenS-3) && !isConsonant(s, lenS-2) && isConsonant(s, lenS-1) {
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result = true
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} else {
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result = false
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}
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// Return
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return result
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}
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func step1a(s []rune) []rune {
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// Initialize.
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var result []rune = s
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lenS := len(s)
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// Do it!
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if suffix := []rune("sses"); hasSuffix(s, suffix) {
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lenTrim := 2
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subSlice := s[:lenS-lenTrim]
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result = subSlice
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} else if suffix := []rune("ies"); hasSuffix(s, suffix) {
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lenTrim := 2
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subSlice := s[:lenS-lenTrim]
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result = subSlice
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} else if suffix := []rune("ss"); hasSuffix(s, suffix) {
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result = s
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} else if suffix := []rune("s"); hasSuffix(s, suffix) {
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lenSuffix := 1
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subSlice := s[:lenS-lenSuffix]
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result = subSlice
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}
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// Return.
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return result
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}
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func step1b(s []rune) []rune {
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// Initialize.
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var result []rune = s
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lenS := len(s)
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// Do it!
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if suffix := []rune("eed"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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m := measure(subSlice)
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if 0 < m {
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lenTrim := 1
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result = s[:lenS-lenTrim]
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}
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} else if suffix := []rune("ed"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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if containsVowel(subSlice) {
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if suffix2 := []rune("at"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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} else if suffix2 := []rune("bl"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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} else if suffix2 := []rune("iz"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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} else if c := subSlice[len(subSlice)-1]; 'l' != c && 's' != c && 'z' != c && hasRepeatDoubleConsonantSuffix(subSlice) {
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lenTrim := 1
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lenSubSlice := len(subSlice)
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result = subSlice[:lenSubSlice-lenTrim]
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} else if c := subSlice[len(subSlice)-1]; 1 == measure(subSlice) && hasConsonantVowelConsonantSuffix(subSlice) && 'w' != c && 'x' != c && 'y' != c {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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result[len(result)-1] = 'e'
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} else {
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result = subSlice
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}
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}
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} else if suffix := []rune("ing"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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if containsVowel(subSlice) {
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if suffix2 := []rune("at"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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result[len(result)-1] = 'e'
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} else if suffix2 := []rune("bl"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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result[len(result)-1] = 'e'
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} else if suffix2 := []rune("iz"); hasSuffix(subSlice, suffix2) {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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result[len(result)-1] = 'e'
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} else if c := subSlice[len(subSlice)-1]; 'l' != c && 's' != c && 'z' != c && hasRepeatDoubleConsonantSuffix(subSlice) {
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lenTrim := 1
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lenSubSlice := len(subSlice)
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result = subSlice[:lenSubSlice-lenTrim]
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} else if c := subSlice[len(subSlice)-1]; 1 == measure(subSlice) && hasConsonantVowelConsonantSuffix(subSlice) && 'w' != c && 'x' != c && 'y' != c {
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lenTrim := -1
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result = s[:lenS-lenSuffix-lenTrim]
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result[len(result)-1] = 'e'
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} else {
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result = subSlice
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}
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}
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}
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// Return.
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return result
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}
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func step1c(s []rune) []rune {
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// Initialize.
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lenS := len(s)
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result := s
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// Do it!
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if 2 > lenS {
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/////////// RETURN
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return result
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}
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if 'y' == s[lenS-1] && containsVowel(s[:lenS-1]) {
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result[lenS-1] = 'i'
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} else if 'Y' == s[lenS-1] && containsVowel(s[:lenS-1]) {
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result[lenS-1] = 'I'
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}
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// Return.
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return result
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}
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func step2(s []rune) []rune {
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// Initialize.
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lenS := len(s)
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result := s
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// Do it!
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if suffix := []rune("ational"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-5] = 'e'
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result = result[:lenS-4]
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}
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} else if suffix := []rune("tional"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = result[:lenS-2]
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}
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} else if suffix := []rune("enci"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-1] = 'e'
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}
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} else if suffix := []rune("anci"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-1] = 'e'
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}
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} else if suffix := []rune("izer"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-1]
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}
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} else if suffix := []rune("bli"); hasSuffix(s, suffix) { // --DEPARTURE--
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// } else if suffix := []rune("abli") ; hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-1] = 'e'
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}
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} else if suffix := []rune("alli"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-2]
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}
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} else if suffix := []rune("entli"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-2]
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}
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} else if suffix := []rune("eli"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-2]
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}
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} else if suffix := []rune("ousli"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-2]
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}
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} else if suffix := []rune("ization"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-5] = 'e'
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result = s[:lenS-4]
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}
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} else if suffix := []rune("ation"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-3] = 'e'
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result = s[:lenS-2]
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}
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} else if suffix := []rune("ator"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-2] = 'e'
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result = s[:lenS-1]
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}
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} else if suffix := []rune("alism"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-3]
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}
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} else if suffix := []rune("iveness"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-4]
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}
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} else if suffix := []rune("fulness"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-4]
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}
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} else if suffix := []rune("ousness"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-4]
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}
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} else if suffix := []rune("aliti"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result = s[:lenS-3]
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}
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} else if suffix := []rune("iviti"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-3] = 'e'
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result = result[:lenS-2]
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}
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} else if suffix := []rune("biliti"); hasSuffix(s, suffix) {
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if 0 < measure(s[:lenS-len(suffix)]) {
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result[lenS-5] = 'l'
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result[lenS-4] = 'e'
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result = result[:lenS-3]
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}
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} else if suffix := []rune("logi"); hasSuffix(s, suffix) { // --DEPARTURE--
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if 0 < measure(s[:lenS-len(suffix)]) {
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lenTrim := 1
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result = s[:lenS-lenTrim]
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}
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}
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// Return.
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return result
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}
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func step3(s []rune) []rune {
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// Initialize.
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lenS := len(s)
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result := s
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// Do it!
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if suffix := []rune("icate"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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if 0 < measure(s[:lenS-lenSuffix]) {
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result = result[:lenS-3]
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}
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} else if suffix := []rune("ative"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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m := measure(subSlice)
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if 0 < m {
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result = subSlice
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}
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} else if suffix := []rune("alize"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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if 0 < measure(s[:lenS-lenSuffix]) {
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result = result[:lenS-3]
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}
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} else if suffix := []rune("iciti"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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if 0 < measure(s[:lenS-lenSuffix]) {
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result = result[:lenS-3]
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}
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} else if suffix := []rune("ical"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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if 0 < measure(s[:lenS-lenSuffix]) {
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result = result[:lenS-2]
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}
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} else if suffix := []rune("ful"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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m := measure(subSlice)
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if 0 < m {
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result = subSlice
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}
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} else if suffix := []rune("ness"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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m := measure(subSlice)
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if 0 < m {
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result = subSlice
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}
|
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}
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|
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// Return.
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return result
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}
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|
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func step4(s []rune) []rune {
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|
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// Initialize.
|
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lenS := len(s)
|
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result := s
|
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|
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// Do it!
|
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if suffix := []rune("al"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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|
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subSlice := s[:lenS-lenSuffix]
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|
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m := measure(subSlice)
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|
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if 1 < m {
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result = result[:lenS-lenSuffix]
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}
|
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} else if suffix := []rune("ance"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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subSlice := s[:lenS-lenSuffix]
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m := measure(subSlice)
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|
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if 1 < m {
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result = result[:lenS-lenSuffix]
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}
|
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} else if suffix := []rune("ence"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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|
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subSlice := s[:lenS-lenSuffix]
|
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|
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m := measure(subSlice)
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|
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if 1 < m {
|
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result = result[:lenS-lenSuffix]
|
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}
|
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} else if suffix := []rune("er"); hasSuffix(s, suffix) {
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lenSuffix := len(suffix)
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|
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subSlice := s[:lenS-lenSuffix]
|
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|
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m := measure(subSlice)
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|
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if 1 < m {
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result = subSlice
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}
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} else if suffix := []rune("ic"); hasSuffix(s, suffix) {
|
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lenSuffix := len(suffix)
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|
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subSlice := s[:lenS-lenSuffix]
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|
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m := measure(subSlice)
|
|
|
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if 1 < m {
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result = subSlice
|
|
}
|
|
} else if suffix := []rune("able"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ible"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ant"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ement"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ment"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ent"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ion"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
c := subSlice[len(subSlice)-1]
|
|
|
|
if 1 < m && ('s' == c || 't' == c) {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ou"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ism"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ate"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("iti"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ous"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ive"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
} else if suffix := []rune("ize"); hasSuffix(s, suffix) {
|
|
lenSuffix := len(suffix)
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
}
|
|
|
|
// Return.
|
|
return result
|
|
}
|
|
|
|
func step5a(s []rune) []rune {
|
|
|
|
// Initialize.
|
|
lenS := len(s)
|
|
result := s
|
|
|
|
// Do it!
|
|
if 'e' == s[lenS-1] {
|
|
lenSuffix := 1
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
} else if 1 == m {
|
|
if c := subSlice[len(subSlice)-1]; !(hasConsonantVowelConsonantSuffix(subSlice) && 'w' != c && 'x' != c && 'y' != c) {
|
|
result = subSlice
|
|
}
|
|
}
|
|
}
|
|
|
|
// Return.
|
|
return result
|
|
}
|
|
|
|
func step5b(s []rune) []rune {
|
|
|
|
// Initialize.
|
|
lenS := len(s)
|
|
result := s
|
|
|
|
// Do it!
|
|
if 2 < lenS && 'l' == s[lenS-2] && 'l' == s[lenS-1] {
|
|
|
|
lenSuffix := 1
|
|
|
|
subSlice := s[:lenS-lenSuffix]
|
|
|
|
m := measure(subSlice)
|
|
|
|
if 1 < m {
|
|
result = subSlice
|
|
}
|
|
}
|
|
|
|
// Return.
|
|
return result
|
|
}
|
|
|
|
func StemString(s string) string {
|
|
|
|
// Convert string to []rune
|
|
runeArr := []rune(s)
|
|
|
|
// Stem.
|
|
runeArr = Stem(runeArr)
|
|
|
|
// Convert []rune to string
|
|
str := string(runeArr)
|
|
|
|
// Return.
|
|
return str
|
|
}
|
|
|
|
func Stem(s []rune) []rune {
|
|
|
|
// Initialize.
|
|
lenS := len(s)
|
|
|
|
// Short circuit.
|
|
if 0 == lenS {
|
|
/////////// RETURN
|
|
return s
|
|
}
|
|
|
|
// Make all runes lowercase.
|
|
for i := 0; i < lenS; i++ {
|
|
s[i] = unicode.ToLower(s[i])
|
|
}
|
|
|
|
// Stem
|
|
result := StemWithoutLowerCasing(s)
|
|
|
|
// Return.
|
|
return result
|
|
}
|
|
|
|
func StemWithoutLowerCasing(s []rune) []rune {
|
|
|
|
// Initialize.
|
|
lenS := len(s)
|
|
|
|
// Words that are of length 2 or less is already stemmed.
|
|
// Don't do anything.
|
|
if 2 >= lenS {
|
|
/////////// RETURN
|
|
return s
|
|
}
|
|
|
|
// Stem
|
|
s = step1a(s)
|
|
s = step1b(s)
|
|
s = step1c(s)
|
|
s = step2(s)
|
|
s = step3(s)
|
|
s = step4(s)
|
|
s = step5a(s)
|
|
s = step5b(s)
|
|
|
|
// Return.
|
|
return s
|
|
}
|