Fix rules

rules/aep0004/resource_name_components_alternate.go

@@ -25,7 +25,7 @@ import (
 	"github.com/jhump/protoreflect/desc"
 )
 
-var identifierRegexp = regexp.MustCompile("^{[a-z][_a-z0-9]*[a-z0-9]}$")
+var identifierRegexp = regexp.MustCompile("^{[a-z][-a-z0-9]*[a-z0-9]}$")
 
 var resourceNameComponentsAlternate = &lint.MessageRule{
 	Name:     lint.NewRuleName(4, "resource-name-components-alternate"),

rules/aep0004/resource_name_components_alternate_test.go

@@ -27,6 +27,7 @@ func TestResourceNameComponentsAlternate(t *testing.T) {
 		problems testutils.Problems
 	}{
 		{"Valid", "author/{author}/books/{book}", testutils.Problems{}},
+		{"Valid", "publishers/{publisher}/books/{book}/editions/{book-edition}", testutils.Problems{}},
 		{"ValidSingleton", "user/{user}/config", testutils.Problems{}},
 		{"InvalidDoubleCollection", "author/books/{book}", testutils.Problems{{Message: "must alternate"}}},
 		{"InvalidDoubleIdentifier", "books/{author}/{book}", testutils.Problems{{Message: "must alternate"}}},

rules/aep0004/resource_plural.go

@@ -31,7 +31,7 @@ var resourcePlural = &lint.MessageRule{
 		r := utils.GetResource(m)
 		l := locations.MessageResource(m)
 		p := r.GetPlural()
-		pLower := utils.ToLowerCamelCase(p)
+		pLower := utils.ToKebabCase(p)
 		if p == "" {
 			return []lint.Problem{{
 				Message:    "Resources should declare plural.",

rules/aep0004/resource_plural_test.go

@@ -27,7 +27,7 @@ func TestResourcePlural(t *testing.T) {
 	}{
 		{
 			"Valid",
-			`plural: "bookShelves"`,
+			`plural: "book-shelves"`,
 			nil,
 		},
 		{

rules/aep0004/resource_singular.go

@@ -32,7 +32,7 @@ var resourceSingular = &lint.MessageRule{
 		l := locations.MessageResource(m)
 		s := r.GetSingular()
 		_, typeName, ok := utils.SplitResourceTypeName(r.GetType())
-		lowerTypeName := utils.ToLowerCamelCase(typeName)
+		lowerTypeName := utils.ToKebabCase(typeName)
 		if s == "" {
 			return []lint.Problem{{
 				Message:    fmt.Sprintf("Resources should declare singular: %q", lowerTypeName),

rules/aep0004/resource_type_name.go

@@ -32,17 +32,17 @@ var resourceTypeName = &lint.MessageRule{
 	LintMessage: func(m *desc.MessageDescriptor) []lint.Problem {
 		resource := utils.GetResource(m)
 		_, typeName, ok := utils.SplitResourceTypeName(resource.GetType())
-		upperTypeName := utils.ToUpperCamelCase(typeName)
+		kebabCase := utils.ToKebabCase(typeName)
 		if !ok {
 			return []lint.Problem{{
 				Message:    "Resource type names must be of the form {Service Name}/{Type}.",
 				Descriptor: m,
 				Location:   locations.MessageResource(m),
 			}}
 		}
-		if upperTypeName != typeName {
+		if kebabCase != typeName {
 			return []lint.Problem{{
-				Message:    fmt.Sprintf("Type must be UpperCamelCase with alphanumeric characters: %q", upperTypeName),
+				Message:    fmt.Sprintf("Type must be kebob-case with alphanumeric characters: %q", kebabCase),
 				Descriptor: m,
 				Location:   locations.MessageResource(m),
 			}}

rules/aep0004/resource_type_name_test.go

@@ -26,15 +26,16 @@ func TestResourceTypeName(t *testing.T) {
 		TypeName string
 		problems testutils.Problems
 	}{
-		{"Valid", "library.googleapis.com/Book", testutils.Problems{}},
+		{"Valid", "library.googleapis.com/book", testutils.Problems{}},
 		{"InvalidTooMany", "library.googleapis.com/shelf/Book", testutils.Problems{{Message: "{Service Name}/{Type}"}}},
 		{"InvalidNotEnough", "library.googleapis.com~Book", testutils.Problems{{Message: "{Service Name}/{Type}"}}},
-		{"InvalidWithUnicode", "library.googleapis.com/BoØkLibre", testutils.Problems{{Message: `Type must be UpperCamelCase`}}},
-		{"InvalidLowerCamelCase", "library.googleapis.com/bookLoan", testutils.Problems{{Message: `Type must be UpperCamelCase with alphanumeric characters: "BookLoan"`}}},
-		{"InvalidTypeNotAlphaNumeric", "library.googleapis.com/Book.:3", testutils.Problems{{Message: `Type must be UpperCamelCase with alphanumeric characters: "Book3"`}}},
-		{"InvalidTypeContainsEmoji", "library.googleapis.com/Book♥️", testutils.Problems{{Message: `Type must be UpperCamelCase with alphanumeric characters: "Book"`}}},
-		{"InvalidTypeContainsDashes", "library.googleapis.com/Book-Shelf️", testutils.Problems{{Message: `Type must be UpperCamelCase with alphanumeric characters: "BookShelf"`}}},
-		{"InvalidTypeContainsUnderscore", "library.googleapis.com/Book_Shelf️", testutils.Problems{{Message: `Type must be UpperCamelCase with alphanumeric characters: "BookShelf"`}}},
+		{"InvalidWithUnicode", "library.googleapis.com/BoØkLibre", testutils.Problems{{Message: `Type must be kebob-case`}}},
+		{"InvalidLowerCamelCase", "library.googleapis.com/bookLoan", testutils.Problems{{Message: `Type must be kebob-case with alphanumeric characters: "book-loan"`}}},
+		{"ValidLowerCamelCase", "library.googleapis.com/book-loan", testutils.Problems{}},
+		{"InvalidTypeNotAlphaNumeric", "library.googleapis.com/Book.:3", testutils.Problems{{Message: `Type must be kebob-case with alphanumeric characters: "book-:3"`}}},
+		{"InvalidTypeContainsEmoji", "library.googleapis.com/Book♥️", testutils.Problems{{Message: `Type must be kebob-case with alphanumeric characters: "book♥️"`}}},
+		{"InvalidTypeContainsDashes", "library.googleapis.com/Book-Shelf️", testutils.Problems{{Message: `Type must be kebob-case with alphanumeric characters: "book--she`}}},
+		{"InvalidTypeContainsUnderscore", "library.googleapis.com/Book_Shelf️", testutils.Problems{{Message: `Type must be kebob-case with alphanumeric characters: "book--she`}}},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			f := testutils.ParseProto3Tmpl(t, `

rules/internal/utils/casing.go

@@ -14,54 +14,27 @@
 
 package utils
 
-// ToUpperCamelCase returns the UpperCamelCase of a string, including removing
-// delimiters (_,-,., ) and using them to denote a new word.
-func ToUpperCamelCase(s string) string {
-	return toCamelCase(s, true, false)
-}
-
-// ToLowerCamelCase returns the lowerCamelCase of a string, including removing
-// delimiters (_,-,., ) and using them to denote a new word.
-func ToLowerCamelCase(s string) string {
-	return toCamelCase(s, false, true)
-}
-
-func toCamelCase(s string, makeNextUpper bool, makeNextLower bool) string {
+// ToKebabCase returns the kebob-case of a word (book-edition).
+func ToKebabCase(s string) string {
 	asLower := make([]rune, 0, len(s))
-	for _, r := range s {
-		if isLower(r) {
-			if makeNextUpper {
-				r = r & '_' // make uppercase
-			}
-			asLower = append(asLower, r)
-		} else if isUpper(r) {
-			if makeNextLower {
-				r = r | ' ' // make lowercase
+	for i, r := range s {
+		if isUpper(r) {
+			r = r | ' ' // make lowercase
+
+			// Only insert hypen after first word.
+			if i != 0 {
+				asLower = append(asLower, '-')
 			}
 			asLower = append(asLower, r)
-		} else if isNumber(r) {
+		} else if r == '-' || r == '_' || r == ' ' || r == '.' {
+			asLower = append(asLower, '-')
+		} else {
 			asLower = append(asLower, r)
 		}
-		makeNextUpper = false
-		makeNextLower = false
-
-		if r == '-' || r == '_' || r == ' ' || r == '.' {
-			// handle snake case scenarios, which generally indicates
-			// a delimited word.
-			makeNextUpper = true
-		}
 	}
 	return string(asLower)
 }
 
 func isUpper(r rune) bool {
 	return ('A' <= r && r <= 'Z')
 }
-
-func isNumber(r rune) bool {
-	return ('0' <= r && r <= '9')
-}
-
-func isLower(r rune) bool {
-	return ('a' <= r && r <= 'z')
-}

rules/internal/utils/casing_test.go

@@ -16,67 +16,6 @@ package utils
 
 import "testing"
 
-func TestToLowerCamelCase(t *testing.T) {
-	for _, test := range []struct {
-		name  string
-		input string
-		want  string
-	}{
-		{
-			name:  "OneWord",
-			input: "Foo",
-			want:  "foo",
-		},
-		{
-			name:  "OneWordNoop",
-			input: "foo",
-			want:  "foo",
-		},
-		{
-			name:  "TwoWords",
-			input: "bookShelf",
-			want:  "bookShelf",
-		},
-		{
-			name:  "WithDash",
-			input: "book-shelf",
-			want:  "bookShelf",
-		},
-		{
-			name:  "WithNumbers",
-			input: "universe42love",
-			want:  "universe42love",
-		},
-		{
-			name:  "WithUnderscore",
-			input: "book_shelf",
-			want:  "bookShelf",
-		},
-		{
-			name:  "WithUnderscore",
-			input: "book_shelf",
-			want:  "bookShelf",
-		},
-		{
-			name:  "WithSpaces",
-			input: "book shelf",
-			want:  "bookShelf",
-		},
-		{
-			name:  "WithPeriods",
-			input: "book.shelf",
-			want:  "bookShelf",
-		},
-	} {
-		t.Run(test.name, func(t *testing.T) {
-			got := ToLowerCamelCase(test.input)
-			if got != test.want {
-				t.Errorf("ToLowerCamelCase(%q) = %q, got %q", test.input, test.want, got)
-			}
-		})
-	}
-}
-
 func TestToUpperCamelCase(t *testing.T) {
 	for _, test := range []struct {
 		name  string
@@ -86,53 +25,53 @@ func TestToUpperCamelCase(t *testing.T) {
 		{
 			name:  "OneWord",
 			input: "foo",
-			want:  "Foo",
+			want:  "foo",
 		},
 		{
 			name:  "OneWordNoop",
 			input: "Foo",
-			want:  "Foo",
+			want:  "foo",
 		},
 		{
 			name:  "TwoWords",
 			input: "bookShelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 		{
 			name:  "WithDash",
 			input: "book-shelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 		{
 			name:  "WithNumbers",
 			input: "universe42love",
-			want:  "Universe42love",
+			want:  "universe42love",
 		},
 		{
 			name:  "WithUnderscore",
 			input: "Book_shelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 		{
 			name:  "WithUnderscore",
 			input: "Book_shelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 		{
 			name:  "WithSpaces",
 			input: "Book shelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 		{
 			name:  "WithPeriods",
 			input: "book.shelf",
-			want:  "BookShelf",
+			want:  "book-shelf",
 		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
-			got := ToUpperCamelCase(test.input)
+			got := ToKebabCase(test.input)
 			if got != test.want {
-				t.Errorf("ToLowerCamelCase(%q) = %q, got %q", test.input, test.want, got)
+				t.Errorf("ToKebabCase(%q) = %q, got %q", test.input, test.want, got)
 			}
 		})
 	}