// Remove adjectival endings and return true if one was removed.
//
func removeAdjectivalEnding(word *snowballword.SnowballWord) bool {
// Remove adjectival endings. Start by looking for
// an adjective ending.
//
suffix, _ := word.RemoveFirstSuffixIn(word.RVstart,
"ими", "ыми", "его", "ого", "ему", "ому", "ее", "ие",
"ые", "ое", "ей", "ий", "ый", "ой", "ем", "им", "ым",
"ом", "их", "ых", "ую", "юю", "ая", "яя", "ою", "ею",
)
if suffix != "" {
// We found an adjective ending. Remove optional participle endings.
//
newSuffix, newSuffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"ивш", "ывш", "ующ",
"ем", "нн", "вш", "ющ", "щ",
)
switch newSuffix {
case "ем", "нн", "вш", "ющ", "щ":
// These are "Group 1" participle endings.
// Group 1 endings must follow а (a) or я (ia) in RV.
if precededByARinRV(word, len(newSuffixRunes)) == false {
newSuffix = ""
}
}
if newSuffix != "" {
word.RemoveLastNRunes(len(newSuffixRunes))
}
return true
}
return false
}
// Remove verb endings and return true if one was removed.
//
func removeVerbEnding(word *snowballword.SnowballWord) bool {
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"уйте", "ейте", "ыть", "ыло", "ыли", "ыла", "уют", "ует",
"нно", "йте", "ишь", "ить", "ите", "ило", "или", "ила",
"ешь", "ете", "ены", "ено", "ена", "ят", "ют", "ыт", "ым",
"ыл", "ую", "уй", "ть", "ны", "но", "на", "ло", "ли", "ла",
"ит", "им", "ил", "ет", "ен", "ем", "ей", "ю", "н", "л", "й",
)
switch suffix {
case "ла", "на", "ете", "йте", "ли", "й", "л", "ем", "н",
"ло", "но", "ет", "ют", "ны", "ть", "ешь", "нно":
// These are "Group 1" verb endings.
// Group 1 endings must follow а (a) or я (ia) in RV.
if precededByARinRV(word, len(suffixRunes)) == false {
suffix = ""
}
}
if suffix != "" {
word.RemoveLastNRunes(len(suffixRunes))
return true
}
return false
}
// Step 2a is the removal of verb suffixes beginning y,
// Search for the longest among the following suffixes
// in RV, and if found, delete if preceded by u.
//
func step2a(word *snowballword.SnowballWord) bool {
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS), "ya", "ye", "yan", "yen", "yeron", "yendo", "yo", "yó", "yas", "yes", "yais", "yamos")
if suffix != "" {
idx := len(word.RS) - len(suffixRunes) - 1
if idx >= 0 && word.RS[idx] == 117 {
word.RemoveLastNRunes(len(suffixRunes))
return true
}
}
return false
}
// Step 2b is the removal of Verb suffixes in RV
// that do not begin with "i".
//
func step2b(word *snowballword.SnowballWord) bool {
// Search for the longest among the following suffixes in RV.
//
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"eraIent", "assions", "erions", "assiez", "assent",
"èrent", "eront", "erons", "eriez", "erait", "erais",
"asses", "antes", "aIent", "âtes", "âmes", "ions",
"erez", "eras", "erai", "asse", "ants", "ante", "ées",
"iez", "era", "ant", "ait", "ais", "és", "ée", "ât",
"ez", "er", "as", "ai", "é", "a",
)
switch suffix {
case "ions":
// Delete if in R2
suffixLen := len(suffixRunes)
if word.FitsInR2(suffixLen) {
word.RemoveLastNRunes(suffixLen)
return true
}
return false
case "é", "ée", "ées", "és", "èrent", "er", "era",
"erai", "eraIent", "erais", "erait", "eras", "erez",
"eriez", "erions", "erons", "eront", "ez", "iez":
// Delete
word.RemoveLastNRunes(len(suffixRunes))
return true
case "âmes", "ât", "âtes", "a", "ai", "aIent",
"ais", "ait", "ant", "ante", "antes", "ants", "as",
"asse", "assent", "asses", "assiez", "assions":
// Delete
word.RemoveLastNRunes(len(suffixRunes))
// If preceded by e (unicode code point 101), delete
//
idx := len(word.RS) - 1
if idx >= 0 && word.RS[idx] == 101 && word.FitsInRV(1) {
word.RemoveLastNRunes(1)
}
return true
}
return false
}
// Remove perfective gerund endings and return true if one was removed.
//
func removePerfectiveGerundEnding(word *snowballword.SnowballWord) bool {
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"ившись", "ывшись", "вшись", "ивши", "ывши", "вши", "ив", "ыв", "в",
)
switch suffix {
case "в", "вши", "вшись":
// These are "Group 1" perfective gerund endings.
// Group 1 endings must follow а (a) or я (ia) in RV.
if precededByARinRV(word, len(suffixRunes)) == false {
suffix = ""
}
}
if suffix != "" {
word.RemoveLastNRunes(len(suffixRunes))
return true
}
return false
}
// Step 2a is the removal of Verb suffixes beginning
// with "i" in the RV region.
//
func step2a(word *snowballword.SnowballWord) bool {
// Search for the longest among the following suffixes
// in RV and if found, delete if preceded by a non-vowel.
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"issantes", "issaIent", "issions", "issants", "issante",
"iraIent", "issons", "issiez", "issent", "issant", "issait",
"issais", "irions", "issez", "isses", "iront", "irons", "iriez",
"irent", "irait", "irais", "îtes", "îmes", "isse", "irez",
"iras", "irai", "ira", "ies", "ît", "it", "is", "ir", "ie", "i",
)
if suffix != "" {
sLen := len(suffixRunes)
idx := len(word.RS) - sLen - 1
if idx >= 0 && word.FitsInRV(sLen+1) && isLowerVowel(word.RS[idx]) == false {
word.RemoveLastNRunes(len(suffixRunes))
return true
}
}
return false
}
// Step 2b is the removal of verb suffixes beginning y,
// Search for the longest among the following suffixes
// in RV, and if found, delete if preceded by u.
//
func step2b(word *snowballword.SnowballWord) bool {
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"iésemos", "iéramos", "iríamos", "eríamos", "aríamos", "ásemos",
"áramos", "ábamos", "isteis", "iríais", "iremos", "ieseis",
"ierais", "eríais", "eremos", "asteis", "aríais", "aremos",
"íamos", "irías", "irían", "iréis", "ieses", "iesen", "ieron",
"ieras", "ieran", "iendo", "erías", "erían", "eréis", "aseis",
"arías", "arían", "aréis", "arais", "abais", "íais", "iste",
"iría", "irás", "irán", "imos", "iese", "iera", "idos", "idas",
"ería", "erás", "erán", "aste", "ases", "asen", "aría", "arás",
"arán", "aron", "aras", "aran", "ando", "amos", "ados", "adas",
"abas", "aban", "ías", "ían", "éis", "áis", "iré", "irá", "ido",
"ida", "eré", "erá", "emos", "ase", "aré", "ará", "ara", "ado",
"ada", "aba", "ís", "ía", "ió", "ir", "id", "es", "er", "en",
"ed", "as", "ar", "an", "ad",
)
switch suffix {
case "":
return false
case "en", "es", "éis", "emos":
// Delete, and if preceded by gu delete the u (the gu need not be in RV)
word.RemoveLastNRunes(len(suffixRunes))
guSuffix, _ := word.FirstSuffix("gu")
if guSuffix != "" {
word.RemoveLastNRunes(1)
}
default:
// Delete
word.RemoveLastNRunes(len(suffixRunes))
}
return true
}
// Step 4 is the cleaning up of residual suffixes.
//
func step4(word *snowballword.SnowballWord) bool {
hadChange := false
if word.String() == "voudrion" {
log.Println("...", word)
}
// If the word ends s (unicode code point 115),
// not preceded by a, i, o, u, è or s, delete it.
//
if idx := len(word.RS) - 1; idx >= 1 && word.RS[idx] == 115 {
switch word.RS[idx-1] {
case 97, 105, 111, 117, 232, 115:
// Do nothing, preceded by a, i, o, u, è or s
return false
default:
word.RemoveLastNRunes(1)
hadChange = true
}
}
// Note: all the following are restricted to the RV region.
// Search for the longest among the following suffixes in RV.
//
suffix, suffixRunes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"Ière", "ière", "Ier", "ier", "ion", "e", "ë",
)
switch suffix {
case "":
return hadChange
case "ion":
// Delete if in R2 and preceded by s or t in RV
const sLen int = 3 // equivalently, len(suffixRunes)
idx := len(word.RS) - sLen - 1
if word.FitsInR2(sLen) && idx >= 0 && word.FitsInRV(sLen+1) {
if word.RS[idx] == 115 || word.RS[idx] == 116 {
word.RemoveLastNRunes(sLen)
return true
}
}
return hadChange
case "ier", "ière", "Ier", "Ière":
// Replace with i
word.ReplaceSuffixRunes(suffixRunes, []rune("i"), true)
return true
case "e":
word.RemoveLastNRunes(1)
return true
case "ë":
// If preceded by gu (unicode code point 103 & 117), delete
idx := len(word.RS) - 1
if idx >= 2 && word.RS[idx-2] == 103 && word.RS[idx-1] == 117 {
word.RemoveLastNRunes(1)
return true
}
return hadChange
}
return true
}
// Step 0 is the removal of attached pronouns
//
func step0(word *snowballword.SnowballWord) bool {
// Search for the longest among the following suffixes
suffix1, suffix1Runes := word.FirstSuffixIn(word.RVstart, len(word.RS),
"selas", "selos", "sela", "selo", "las", "les",
"los", "nos", "me", "se", "la", "le", "lo",
)
// If the suffix empty or not in RV, we have nothing to do.
if suffix1 == "" {
return false
}
// We'll remove suffix1, if comes after one of the following
suffix2, suffix2Runes := word.FirstSuffixIn(word.RVstart, len(word.RS)-len(suffix1),
"iéndo", "iendo", "yendo", "ando", "ándo",
"ár", "ér", "ír", "ar", "er", "ir",
)
switch suffix2 {
case "":
// Nothing to do
return false
case "iéndo", "ándo", "ár", "ér", "ír":
// In these cases, deletion is followed by removing
// the acute accent (e.g., haciéndola -> haciendo).
var suffix2repl string
switch suffix2 {
case "":
return false
case "iéndo":
suffix2repl = "iendo"
case "ándo":
suffix2repl = "ando"
case "ár":
suffix2repl = "ar"
case "ír":
suffix2repl = "ir"
}
word.RemoveLastNRunes(len(suffix1Runes))
word.ReplaceSuffixRunes(suffix2Runes, []rune(suffix2repl), true)
return true
case "ando", "iendo", "ar", "er", "ir":
word.RemoveLastNRunes(len(suffix1Runes))
return true
case "yendo":
// In the case of "yendo", the "yendo" must lie in RV,
// and be preceded by a "u" somewhere in the word.
for i := 0; i < len(word.RS)-(len(suffix1)+len(suffix2)); i++ {
// Note, the unicode code point for "u" is 117.
if word.RS[i] == 117 {
word.RemoveLastNRunes(len(suffix1Runes))
return true
}
}
}
return false
}