fix: Fix enums with words ending in numerals. (#618)

Fixes #614.

Author: Luke Sneeringer

rules/aip0126/unspecified.go

@@ -16,6 +16,7 @@ package aip0126
 
 import (
 	"fmt"
+	"regexp"
 	"strings"
 
 	"github.com/googleapis/api-linter/lint"
@@ -27,13 +28,16 @@ import (
 var unspecified = &lint.EnumRule{
 	Name: lint.NewRuleName(126, "unspecified"),
 	LintEnum: func(e *desc.EnumDescriptor) []lint.Problem {
-		firstValue := e.GetValues()[0]
-		want := strings.ToUpper(strcase.SnakeCase(e.GetName()) + "_UNSPECIFIED")
+		name := endNum.ReplaceAllString(e.GetName(), "${1}_${2}")
+		want := strings.ToUpper(strcase.SnakeCase(name) + "_UNSPECIFIED")
 		for _, element := range e.GetValues() {
 			if element.GetName() == want && element.GetNumber() == 0 {
 				return nil
 			}
 		}
+
+		// We did not find the enum value we wanted; complain.
+		firstValue := e.GetValues()[0]
 		return []lint.Problem{{
 			Message:    fmt.Sprintf("The first enum value should be %q", want),
 			Suggestion: want,
@@ -42,3 +46,5 @@ var unspecified = &lint.EnumRule{
 		}}
 	},
 }
+
+var endNum = regexp.MustCompile("([0-9])([A-Z])")

rules/aip0126/unspecified_test.go

@@ -23,19 +23,22 @@ import (
 func TestUnspecified(t *testing.T) {
 	tests := []struct {
 		testName  string
+		EnumName  string
 		ValueName string
 		problems  testutils.Problems
 	}{
-		{"Valid", "BOOK_FORMAT_UNSPECIFIED", testutils.Problems{}},
-		{"InvalidNoPrefix", "UNSPECIFIED", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
-		{"InvalidWrongSuffix", "BOOK_FORMAT_UNKNOWN", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
-		{"InvalidJustWrong", "UNKNOWN", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
+		{"Valid", "BookFormat", "BOOK_FORMAT_UNSPECIFIED", testutils.Problems{}},
+		{"ValidWithNum", "Ipv6Format", "IPV6_FORMAT_UNSPECIFIED", nil},
+		{"InvalidNoPrefix", "BookFormat", "UNSPECIFIED", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
+		{"InvalidWrongSuffix", "BookFormat", "BOOK_FORMAT_UNKNOWN", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
+		{"InvalidJustWrong", "BookFormat", "UNKNOWN", testutils.Problems{{Suggestion: "BOOK_FORMAT_UNSPECIFIED"}}},
+		{"InvalidWithNum", "Ipv6Format", "IPV6FORMAT_UNSPECIFIED", testutils.Problems{{Suggestion: "IPV6_FORMAT_UNSPECIFIED"}}},
 	}
 	for _, test := range tests {
 		t.Run(test.testName, func(t *testing.T) {
 			// Create the proto with the enum.
 			f := testutils.ParseProto3Tmpl(t, `
-				enum BookFormat {
+				enum {{.EnumName}} {
 					{{.ValueName}} = 0;
 					HARDBACK = 1;
 					PAPERBACK = 2;
@@ -53,8 +56,8 @@ func TestUnspecified(t *testing.T) {
 		t.Run(test.testName, func(t *testing.T) {
 			// Create the proto with the enum.
 			f := testutils.ParseProto3Tmpl(t, `
-				enum BookFormat {
-					option allow_alias = true; 
+				enum {{.EnumName}} {
+					option allow_alias = true;
 					HARDBACK = 0;
 					{{.ValueName}} = 0;
 					PAPERBACK = 1;