Update traversal logic for proto2

Author: mrabiciu

Sources/protoc-gen-swift/MessageFieldGenerator.swift

@@ -50,7 +50,7 @@ class MessageFieldGenerator: FieldGeneratorBase, FieldGenerator {
     }
 
     var usesAlwaysVisitPrimitivesFlagForTraversal: Bool {
-        !hasFieldPresence || (!isGroupOrMessage && fieldDescriptor.file.syntax == .proto2)
+        !hasFieldPresence
     }
 
     init(descriptor: FieldDescriptor,
@@ -206,13 +206,7 @@ class MessageFieldGenerator: FieldGeneratorBase, FieldGenerator {
             conditional = "!\(storedProperty).isEmpty || alwaysVisitPrimitiveFields"
         } else if hasFieldPresence {
             usesLocals = true
-            if !isGroupOrMessage, fieldDescriptor.file.syntax == .proto2 {
-                // Under proto2 all primitives have presence but 
-                // we want include primitives if alwaysVisitPrimitiveFields is true
-                conditional = "let v = \(storedProperty) ?? (alwaysVisitPrimitiveFields ? \(isEnum ? swiftType : "")\(swiftDefaultValue) : nil)"
-            } else {
-                conditional = "let v = \(storedProperty)"
-            }
+            conditional = "let v = \(storedProperty)"
         } else {
             // At this point, the fields would be a primative type, and should only
             // be visted if it is the non default value.

Tests/SwiftProtobufTests/Test_JSON.swift

@@ -1177,26 +1177,6 @@ final class Test_JSONDefaultValues: XCTestCase {
 
     func testProto2() {
         let expected = "{"
-        + #""optionalInt32":0,"#
-        + #""optionalInt64":"0","#
-        + #""optionalUint32":0,"#
-        + #""optionalUint64":"0","#
-        + #""optionalSint32":0,"#
-        + #""optionalSint64":"0","#
-        + #""optionalFixed32":0,"#
-        + #""optionalFixed64":"0","#
-        + #""optionalSfixed32":0,"#
-        + #""optionalSfixed64":"0","#
-        + #""optionalFloat":0.0,"#
-        + #""optionalDouble":0.0,"#
-        + #""optionalBool":false,"#
-        + #""optionalString":"","#
-        + #""optionalBytes":"","#
-        + #""optionalNestedEnum":"FOO","#
-        + #""optionalForeignEnum":"FOREIGN_FOO","#
-        + #""optionalImportEnum":"IMPORT_FOO","#
-        + #""optionalStringPiece":"","#
-        + #""optionalCord":"","#
         + #""repeatedInt32":[],"#
         + #""repeatedInt64":[],"#
         + #""repeatedUint32":[],"#
@@ -1220,27 +1200,7 @@ final class Test_JSONDefaultValues: XCTestCase {
         + #""repeatedImportEnum":[],"#
         + #""repeatedStringPiece":[],"#
         + #""repeatedCord":[],"#
-        + #""repeatedLazyMessage":[],"#
-        + #""defaultInt32":41,"#
-        + #""defaultInt64":"42","#
-        + #""defaultUint32":43,"#
-        + #""defaultUint64":"44","#
-        + #""defaultSint32":-45,"#
-        + #""defaultSint64":"46","#
-        + #""defaultFixed32":47,"#
-        + #""defaultFixed64":"48","#
-        + #""defaultSfixed32":49,"#
-        + #""defaultSfixed64":"-50","#
-        + #""defaultFloat":51.5,"#
-        + #""defaultDouble":52000.0,"#
-        + #""defaultBool":true,"#
-        + #""defaultString":"hello","#
-        + #""defaultBytes":"d29ybGQ=","#
-        + #""defaultNestedEnum":"BAR","#
-        + #""defaultForeignEnum":"FOREIGN_BAR","#
-        + #""defaultImportEnum":"IMPORT_BAR","#
-        + #""defaultStringPiece":"abc","#
-        + #""defaultCord":"123""#
+        + #""repeatedLazyMessage":[]"#
         + "}"
 
         var encodingOptions = JSONEncodingOptions()
@@ -1251,27 +1211,9 @@ final class Test_JSONDefaultValues: XCTestCase {
 
     func testProto2Configured() {
         let expected = "{"
-        + #""optionalInt32":0,"#
-        + #""optionalInt64":"0","#
-        + #""optionalUint32":0,"#
-        + #""optionalUint64":"0","#
-        + #""optionalSint32":0,"#
-        + #""optionalSint64":"0","#
-        + #""optionalFixed32":0,"#
-        + #""optionalFixed64":"0","#
-        + #""optionalSfixed32":0,"#
-        + #""optionalSfixed64":"0","#
-        + #""optionalFloat":0.0,"#
-        + #""optionalDouble":0.0,"#
-        + #""optionalBool":false,"#
         + #""optionalString":"i am a test string value","#
         + #""optionalBytes":"aSBhbSBhIHRlc3Qgc3RyaW5nIHZhbHVl","#
-        + #""optionalNestedMessage":{"bb":0},"#
-        + #""optionalNestedEnum":"FOO","#
-        + #""optionalForeignEnum":"FOREIGN_FOO","#
-        + #""optionalImportEnum":"IMPORT_FOO","#
-        + #""optionalStringPiece":"","#
-        + #""optionalCord":"","#
+        + #""optionalNestedMessage":{},"#
         + #""repeatedInt32":[],"#
         + #""repeatedInt64":[],"#
         + #""repeatedUint32":[],"#
@@ -1295,27 +1237,7 @@ final class Test_JSONDefaultValues: XCTestCase {
         + #""repeatedImportEnum":[],"#
         + #""repeatedStringPiece":[],"#
         + #""repeatedCord":[],"#
-        + #""repeatedLazyMessage":[],"#
-        + #""defaultInt32":41,"#
-        + #""defaultInt64":"42","#
-        + #""defaultUint32":43,"#
-        + #""defaultUint64":"44","#
-        + #""defaultSint32":-45,"#
-        + #""defaultSint64":"46","#
-        + #""defaultFixed32":47,"#
-        + #""defaultFixed64":"48","#
-        + #""defaultSfixed32":49,"#
-        + #""defaultSfixed64":"-50","#
-        + #""defaultFloat":51.5,"#
-        + #""defaultDouble":52000.0,"#
-        + #""defaultBool":true,"#
-        + #""defaultString":"hello","#
-        + #""defaultBytes":"d29ybGQ=","#
-        + #""defaultNestedEnum":"BAR","#
-        + #""defaultForeignEnum":"FOREIGN_BAR","#
-        + #""defaultImportEnum":"IMPORT_BAR","#
-        + #""defaultStringPiece":"abc","#
-        + #""defaultCord":"123""#
+        + #""repeatedLazyMessage":[]"#
         + "}"
 
         var encodingOptions = JSONEncodingOptions()
@@ -1329,37 +1251,7 @@ final class Test_JSONDefaultValues: XCTestCase {
     }
 
     func testExtremeDefaultValues() {
-        let expected = "{"
-        + #""escapedBytes":"AAEHCAwKDQkLXCci/g==","#
-        + #""largeUint32":4294967295,"#
-        + #""largeUint64":"18446744073709551615","#
-        + #""smallInt32":-2147483647,"#
-        + #""smallInt64":"-9223372036854775807","#
-        + #""utf8String":"ሴ","#
-        + #""zeroFloat":0.0,"#
-        + #""oneFloat":1.0,"#
-        + #""smallFloat":1.5,"#
-        + #""negativeOneFloat":-1.0,"#
-        + #""negativeFloat":-1.5,"#
-        + #""largeFloat":2e+08,"#
-        + #""smallNegativeFloat":-8e-28,"#
-        + #""infDouble":"Infinity","#
-        + #""negInfDouble":"-Infinity","#
-        // TODO: NaN and Inifinity should fall back to 0 like they do in C++
-        + #""nanDouble":"NaN","#
-        + #""infFloat":"Infinity","#
-        + #""negInfFloat":"-Infinity","#
-        + #""nanFloat":"NaN","#
-        + #""cppTrigraph":"? ? ?? ?? ??? ??/ ??-","#
-        + #""reallySmallInt32":-2147483648,"#
-        + #""reallySmallInt64":"-9223372036854775808","#
-        + #""stringWithZero":"hel\u0000lo","#
-        + #""bytesWithZero":"d29yAGxk","#
-        + #""stringPieceWithZero":"ab\u0000c","#
-        + #""cordWithZero":"12\u00003","#
-        + #""replacementString":"${unknown}""#
-        + "}"
-        
+        let expected = "{}"
         var encodingOptions = JSONEncodingOptions()
         encodingOptions.alwaysPrintPrimitiveFields = true
         let msg = SwiftProtoTesting_TestExtremeDefaultValues()