Add verb conjugation

Added conjugation for verbs.  A single verb now gets appended onto a
noun phrase.

generic.go

@@ -34,6 +34,23 @@ func (g *generic) Random() (string, error) {
 	sb := strings.Builder{}
 	sb.WriteString(np)
 
+	ctime := models.CM_Present
+	ctype := models.CT_I
+	invert := false	// TODO: implement this
+
+	if plural {
+		ctype = models.CT_They
+	}
+
+	v, err := g.randomVerb(ctype, ctime, invert)
+	if err != nil {
+		return "", err
+	}
+
+	sb.WriteString(" ")
+	sb.WriteString(v)
+	sb.WriteString(" ")
+
 	return sb.String(), nil
 }
 
@@ -121,7 +138,7 @@ func (g *generic) randomNoun(plural bool) (string, error) {
 	return noun.Word, nil
 }
 
-func (g *generic) randomVerb() (string, error) {
+func (g *generic) randomVerb(ctype models.ConjugationType, ctime models.ConjugationTime, invert bool) (string, error) {
 	ids, err := g.db.GetVerbIds()
 	if err != nil {
 		return "", fmt.Errorf("[verb] get IDs error: %v", err)
@@ -137,7 +154,7 @@ func (g *generic) randomVerb() (string, error) {
 		return "", fmt.Errorf("[verb] ID: %d; %v", ids[rid], err)
 	}
 
-	return verb.Word, nil
+	return verb.Conjugate(ctype, ctime, invert), nil
 }
 
 func (g *generic) InitData(filename string) error {

models/verb.go

@@ -1,5 +1,10 @@
 package models
 
+import (
+	"fmt"
+	"strings"
+)
+
 type Verb struct {
 	Id int
 
@@ -8,21 +13,106 @@ type Verb struct {
 	// Indefinite form
 	Word string
 
-	ConjugationsPast    []Conjugate
-	ConjugationsPresent []Conjugate
-	ConjugationsFuture  []Conjugate
+	//ConjugationsPast    []Conjugate
+	//ConjugationsPresent []Conjugate
+	//ConjugationsFuture  []Conjugate
 }
 
-type ConjugateType int
+//type Conjugate struct {
+//	Type ConjugateType
+//	Form string
+//}
+
+type ConjugationType int
 const (
-	CT_I ConjugateType = iota
+	CT_I ConjugationType = iota
 	CT_You
 	CT_It
 	CT_We
 	CT_They
 )
 
-type Conjugate struct {
-	Type ConjugateType
-	Form string
+func (ct ConjugationType) String() string {
+	switch ct {
+	case CT_I:
+		return "I"
+	case CT_It:
+		return "It"
+	case CT_You:
+		return "You"
+	case CT_We:
+		return "We"
+	case CT_They:
+		return "They"
+	default:
+		return "Unknown"
+	}
+}
+
+type ConjugationTime int
+const (
+	CM_Present ConjugationTime = iota
+	CM_Past
+	CM_Future
+)
+
+func (cm ConjugationTime) String() string {
+	switch cm {
+	case CM_Present:
+		return "Present"
+	case CM_Past:
+		return "Past"
+	case CM_Future:
+		return "Future"
+	default:
+		return "Unknown"
+	}
+}
+
+// TODO: implement inverted
+func (v Verb) Conjugate(conjugation ConjugationType, time ConjugationTime, inverted bool ) string {
+	if !v.Regular {
+		fmt.Printf("[verb] Irregular verbs not implemented! %q\n", v.Word)
+		return v.Word
+	}
+
+	//fmt.Printf("[verb] word: %s; type: %s; time: %s\n", v.Word, conjugation, time)
+
+	switch time {
+	case CM_Present:
+		if conjugation == CT_It {
+			sfx := []string{"s", "x", "sh", "ch", "ss"}
+			for _, s := range sfx {
+				if strings.HasSuffix(v.Word, s) {
+					return v.Word + "es"
+				}
+			}
+
+			if strings.HasSuffix(v.Word, "y") && !strings.ContainsAny(string(v.Word[len(v.Word)-2]), "aeiou") {
+				return v.Word[:len(v.Word)-1] + "ies"
+			}
+
+			return v.Word + "s"
+
+		} else {
+			return v.Word
+		}
+
+	case CM_Past:
+		if strings.HasSuffix(v.Word, "e") {
+			return v.Word + "d"
+		}
+
+		if strings.HasSuffix(v.Word, "y") && !strings.ContainsAny(string(v.Word[len(v.Word)-2]), "aeiou") {
+			return v.Word[:len(v.Word)-1] + "ied"
+		}
+
+		return v.Word + "ed"
+
+	case CM_Future:
+		return "will " + v.Word
+	}
+
+	fmt.Printf("[verb] Unknown ConjugationTime: %d\n", conjugation)
+	return v.Word
 }