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stemmer_steps.go
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591 lines (521 loc) · 12.9 KB
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package stemmer
// TODO:
// in the initial stem entry function filter out strings of
// length 1 and 2
func step1A(input string) string {
last := len(input) - 1
if find(input, "S", last, last+1) {
if find(input, "E", last-1, last) {
if find(input, "I", last-2, last-1) {
return replace(input, "IES", "I")
} else if find(input, "S", last-2, last-1) && find(input, "S", last-3, last-2) {
return replace(input, "SSES", "SS")
}
}
if !find(input, "S", last-1, last) {
return replace(input, "S", "")
}
return replace(input, "SS", "SS")
}
return input
}
func step1B(input string) string {
last := len(input) - 1
if find(input, "D", last, last+1) {
if find(input, "E", last-1, last) {
if find(input, "E", last-2, last-1) {
if processStem(input[0:last-2]).measure > 0 {
return replace(input, "EED", "EE")
}
} else {
if (last-1) >= 0 && processStem(input[0:last-1]).vCondition {
return step1BAfter(replace(input, "ED", ""))
}
}
}
} else if find(input, "G", last, last+1) {
if find(input, "N", last-1, last) {
if find(input, "I", last-2, last-1) {
if processStem(input[0 : last-2]).vCondition {
return step1BAfter(replace(input, "ING", ""))
}
}
}
}
return input
}
func step1BAfter(input string) string {
last := len(input) - 1
if find(input, "T", last, last+1) {
if find(input, "A", last-1, last) {
return replace(input, "AT", "ATE")
}
}
if find(input, "L", last, last+1) {
if find(input, "B", last-1, last) {
return replace(input, "BL", "BLE")
}
}
if find(input, "Z", last, last+1) {
if find(input, "I", last-1, last) {
return replace(input, "IZ", "IZE")
}
}
stem := processStem(input)
if stem.dCondition {
if stem.lastChar != 'L' && stem.lastChar != 'S' && stem.lastChar != 'Z' {
return input[0:last]
}
} else if stem.oCondition && stem.measure == 1 {
return input + "E"
}
return input
}
func step1C(input string) string {
last := len(input) - 1
if find(input, "Y", last, last+1) {
stem := processStem(input[0:last])
if stem.vCondition {
return replace(input, "Y", "I")
}
}
return input
}
func step2(input string) string {
last := len(input) - 1
if last-1 < 0 {
return input
}
switch input[last-1] {
case 'A':
return step2ProcessA(input)
case 'C':
return step2ProcessC(input)
case 'E':
return step2ProcessE(input)
case 'L':
return step2ProcessL(input)
case 'O':
return step2ProcessO(input)
case 'S':
return step2ProcessS(input)
case 'T':
return step2ProcessT(input)
}
return input
}
func step2ProcessA(input string) string {
last := len(input) - 1
if find(input, "TIONAL", last-5, last+1) {
if find(input, "A", last-6, last-5) {
if processStem(input[0:last-6]).measure > 0 {
return replace(input, "ATIONAL", "ATE")
}
} else {
if processStem(input[0:last-5]).measure > 0 {
return replace(input, "TIONAL", "TION")
}
}
}
return input
}
func step2ProcessC(input string) string {
last := len(input) - 1
if find(input, "NCI", last-2, last+1) {
if find(input, "A", last-3, last-2) {
if processStem(input[0:last-2]).measure > 0 {
return replace(input, "ANCI", "ANCE")
}
} else if find(input, "E", last-3, last-2) {
if processStem(input[0:last-2]).measure > 0 {
return replace(input, "ENCI", "ENCE")
}
}
}
return input
}
func step2ProcessE(input string) string {
last := len(input) - 1
if find(input, "R", last, last+1) {
if find(input, "Z", last-2, last-1) && find(input, "I", last-3, last-2) {
return replace(input, "IZER", "IZE")
}
}
return input
}
func step2ProcessL(input string) string {
last := len(input) - 1
if find(input, "I", last, last+1) {
if find(input, "B", last-2, last-1) && find(input, "A", last-3, last-2) {
if processStem(input[0:last-3]).measure > 0 {
return replace(input, "ABLI", "ABLE")
}
} else if find(input, "L", last-2, last-1) && find(input, "A", last-3, last-2) {
if processStem(input[0:last-3]).measure > 0 {
return replace(input, "ALLI", "AL")
}
} else if find(input, "T", last-2, last-1) {
if find(input, "EN", last-4, last-2) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ENTLI", "ENT")
}
}
} else if find(input, "E", last-2, last-1) {
if processStem(input[0:last-2]).measure > 0 {
return replace(input, "ELI", "E")
}
} else if find(input, "S", last-2, last-1) {
if find(input, "OUSLI", last-4, last+1) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "OUSLI", "OUS")
}
}
}
}
return input
}
func step2ProcessO(input string) string {
last := len(input) - 1
if find(input, "N", last, last+1) {
if find(input, "ATI", last-4, last-1) {
if find(input, "Z", last-5, last-4) {
if find(input, "I", last-6, last-5) {
if processStem(input[0:last-6]).measure > 0 {
return replace(input, "IZATION", "IZE")
}
}
} else {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ATION", "ATE")
}
}
}
} else if find(input, "R", last, last+1) {
if find(input, "ATO", last-3, last) {
if processStem(input[0:last-3]).measure > 0 {
return replace(input, "ATOR", "ATE")
}
}
}
return input
}
func step2ProcessS(input string) string {
last := len(input) - 1
if find(input, "M", last, last+1) {
if find(input, "ALI", last-4, last-1) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ALISM", "AL")
}
}
} else if find(input, "S", last, last+1) {
if find(input, "NE", last-3, last-1) {
if last-6 < 0 {
return input
}
str := input[last-6 : last-3]
if str == "IVE" {
if processStem(input[0:last-6]).measure > 0 {
return replace(input, "IVENESS", "IVE")
}
} else if str == "FUL" {
if processStem(input[0:last-6]).measure > 0 {
return replace(input, "FULNESS", "FUL")
}
} else if str == "OUS" {
if processStem(input[0:last-6]).measure > 0 {
return replace(input, "OUSNESS", "OUS")
}
}
}
}
return input
}
func step2ProcessT(input string) string {
last := len(input) - 1
if find(input, "I", last, last+1) {
if find(input, "I", last-2, last-1) {
if find(input, "L", last-3, last-2) {
if find(input, "A", last-4, last-3) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ALITI", "AL")
}
} else if find(input, "BI", last-5, last-3) {
if processStem(input[0:last-5]).measure > 0 {
return replace(input, "BILITI", "BLE")
}
}
} else if find(input, "V", last-3, last-2) {
if find(input, "I", last-4, last-3) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "IVITI", "IVE")
}
}
}
}
}
return input
}
func step3(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if last-4 < 0 {
return input
}
str := input[last-4 : last]
if str == "ICAT" {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ICATE", "IC")
}
} else if str == "ATIV" {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ATIVE", "")
}
} else if str == "ALIZ" {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ALIZE", "AL")
}
}
} else if find(input, "I", last, last+1) {
if find(input, "ICIT", last-4, last) {
if processStem(input[0:last-4]).measure > 0 {
return replace(input, "ICITI", "IC")
}
}
} else if find(input, "L", last, last+1) {
if find(input, "ICA", last-3, last) {
if processStem(input[0:last-3]).measure > 0 {
return replace(input, "ICAL", "IC")
}
} else if find(input, "FU", last-2, last) {
if processStem(input[0:last-2]).measure > 0 {
return replace(input, "FUL", "")
}
}
} else if find(input, "S", last, last+1) {
if find(input, "NES", last-3, last) {
if processStem(input[0:last-3]).measure > 0 {
return replace(input, "NESS", "")
}
}
}
return input
}
func step4(input string) string {
last := len(input) - 1
if last-1 < 0 {
return input
}
switch input[last-1] {
case 'A':
return step4ProcessA(input)
case 'C':
return step4ProcessC(input)
case 'E':
return step4ProcessE(input)
case 'I':
return step4ProcessI(input)
case 'L':
return step4ProcessL(input)
case 'N':
return step4ProcessN(input)
case 'O':
return step4ProcessO(input)
case 'S':
return step4ProcessS(input)
case 'T':
return step4ProcessT(input)
case 'U':
return step4ProcessU(input)
case 'V':
return step4ProcessV(input)
case 'Z':
return step4ProcessZ(input)
}
return input
}
func step4ProcessA(input string) string {
last := len(input) - 1
if find(input, "L", last, last+1) {
if processStem(input[0:last-1]).measure > 1 {
return replace(input, "AL", "")
}
}
return input
}
func step4ProcessC(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if last-3 < 0 {
return input
}
str := input[last-3 : last-1]
if str == "AN" {
if processStem(input[0:last-3]).measure > 1 {
return replace(input, "ANCE", "")
}
} else if str == "EN" {
if processStem(input[0:last-3]).measure > 1 {
return replace(input, "ENCE", "")
}
}
}
return input
}
func step4ProcessE(input string) string {
last := len(input) - 1
if find(input, "R", last, last+1) {
if processStem(input[0:last-1]).measure > 1 {
return replace(input, "ER", "")
}
}
return input
}
func step4ProcessI(input string) string {
last := len(input) - 1
if find(input, "C", last, last+1) {
if processStem(input[0:last-1]).measure > 1 {
return replace(input, "IC", "")
}
}
return input
}
func step4ProcessL(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if last-3 < 0 {
return input
}
str := input[last-3 : last-1]
if str == "AB" {
if processStem(input[0:last-3]).measure > 1 {
return replace(input, "ABLE", "")
}
} else if str == "IB" {
if processStem(input[0:last-3]).measure > 1 {
return replace(input, "IBLE", "")
}
}
}
return input
}
func step4ProcessN(input string) string {
last := len(input) - 1
if find(input, "T", last, last+1) {
if find(input, "A", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "ANT", "")
}
} else if find(input, "E", last-2, last-1) {
if find(input, "M", last-3, last-2) {
if find(input, "E", last-4, last-3) {
if processStem(input[0:last-4]).measure > 1 {
return replace(input, "EMENT", "")
}
} else {
if processStem(input[0:last-3]).measure > 1 {
return replace(input, "MENT", "")
}
}
} else {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "ENT", "")
}
}
}
}
return input
}
func step4ProcessO(input string) string {
last := len(input) - 1
if find(input, "N", last, last+1) {
if find(input, "I", last-2, last-1) {
stem := processStem(input[0 : last-2])
if stem.measure > 1 && (stem.lastChar == 'S' || stem.lastChar == 'T') {
return replace(input, "ION", "")
}
}
} else if find(input, "U", last, last+1) {
if processStem(input[0:last-1]).measure > 1 {
return replace(input, "OU", "")
}
}
return input
}
func step4ProcessS(input string) string {
last := len(input) - 1
if find(input, "M", last, last+1) {
if find(input, "I", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "ISM", "")
}
}
}
return input
}
func step4ProcessT(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if find(input, "A", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "ATE", "")
}
}
} else if find(input, "I", last, last+1) {
if find(input, "I", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "ITI", "")
}
}
}
return input
}
func step4ProcessU(input string) string {
last := len(input) - 1
if find(input, "S", last, last+1) {
if find(input, "O", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "OUS", "")
}
}
}
return input
}
func step4ProcessV(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if find(input, "I", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "IVE", "")
}
}
}
return input
}
func step4ProcessZ(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
if find(input, "I", last-2, last-1) {
if processStem(input[0:last-2]).measure > 1 {
return replace(input, "IZE", "")
}
}
}
return input
}
func step5A(input string) string {
last := len(input) - 1
if find(input, "E", last, last+1) {
stem := processStem(input[0:last])
if stem.measure > 1 || (stem.measure == 1 && !stem.oCondition) {
return input[0:last]
}
}
return input
}
func step5B(input string) string {
stem := processStem(input)
if stem.measure > 1 && stem.dCondition && stem.lastChar == 'L' {
return input[0 : len(input)-1]
}
return input
}