Dart: use lower camel case for values

bin/configs/dart-dio-petstore-client-use-lower-camel-case.yaml

@@ -0,0 +1,13 @@
+generatorName: dart-dio
+outputDir: samples/openapi3/client/petstore/dart-dio/petstore_client_lib_use_lower_camel_case
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore-use-lower-camel-case.yaml
+templateDir: modules/openapi-generator/src/main/resources/dart/libraries/dio
+typeMappings:
+  Client: "ModelClient"
+  File: "ModelFile"
+  EnumClass: "ModelEnumClass"
+additionalProperties:
+  hideGenerationTimestamp: "true"
+  enumUnknownDefaultCase: "true"
+  serializationLibrary: "json_serializable"
+  useLowerCamelCase: "true"

bin/configs/dart-petstore-client-use-lower-camel-case.yaml

@@ -0,0 +1,10 @@
+generatorName: dart
+outputDir: samples/openapi3/client/petstore/dart2/petstore_client_lib_use_lower_camel_case
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore-use-lower-camel-case.yaml
+templateDir: modules/openapi-generator/src/main/resources/dart2
+typeMappings:
+  Client: "ModelClient"
+  File: "ModelFile"
+additionalProperties:
+  hideGenerationTimestamp: "true"
+  useLowerCamelCase: "true"

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractDartCodegen.java

@@ -46,6 +46,7 @@ public abstract class AbstractDartCodegen extends DefaultCodegen {
     public static final String PUB_REPOSITORY = "pubRepository";
     public static final String PUB_PUBLISH_TO = "pubPublishTo";
     public static final String USE_ENUM_EXTENSION = "useEnumExtension";
+    public static final String USE_LOWER_CAMEL_CASE = "useLowerCamelCase";
 
     @Setter protected String pubLibrary = "openapi.api";
     @Setter protected String pubName = "openapi";
@@ -57,6 +58,7 @@ public abstract class AbstractDartCodegen extends DefaultCodegen {
     @Setter protected String pubRepository = null;
     @Setter protected String pubPublishTo = null;
     @Setter protected boolean useEnumExtension = false;
+    @Setter protected boolean useLowerCamelCase = true;
     @Setter protected String sourceFolder = "src";
     protected String libPath = "lib" + File.separator;
     protected String apiDocPath = "doc/";
@@ -196,6 +198,7 @@ public AbstractDartCodegen() {
         addOption(PUB_REPOSITORY, "Repository in generated pubspec", pubRepository);
         addOption(PUB_PUBLISH_TO, "Publish_to in generated pubspec", pubPublishTo);
         addOption(USE_ENUM_EXTENSION, "Allow the 'x-enum-values' extension for enums", String.valueOf(useEnumExtension));
+        addOption(USE_LOWER_CAMEL_CASE, "Use lower camel case", String.valueOf(useLowerCamelCase));
         addOption(CodegenConstants.SOURCE_FOLDER, CodegenConstants.SOURCE_FOLDER_DESC, sourceFolder);
     }
 
@@ -302,6 +305,12 @@ public void processOpts() {
             additionalProperties.put(USE_ENUM_EXTENSION, useEnumExtension);
         }
 
+        if (additionalProperties.containsKey(USE_LOWER_CAMEL_CASE)) {
+            this.setUseEnumExtension(convertPropertyToBooleanAndWriteBack(USE_LOWER_CAMEL_CASE));
+        } else {
+            additionalProperties.put(USE_ENUM_EXTENSION, useLowerCamelCase);
+        }
+
         if (additionalProperties.containsKey(CodegenConstants.SOURCE_FOLDER)) {
             String srcFolder = (String) additionalProperties.get(CodegenConstants.SOURCE_FOLDER);
             this.setSourceFolder(srcFolder.replace('/', File.separatorChar));
@@ -387,7 +396,7 @@ public String toVarName(String name) {
         name = name.replaceAll("^_", "");
 
         // if it's all upper case, do nothing
-        if (name.matches("^[A-Z_]*$")) {
+        if (!useLowerCamelCase && name.matches("^[A-Z_]*$")) {
             return name;
         }
 
@@ -399,9 +408,14 @@ public String toVarName(String name) {
         // remove the rest
         name = sanitizeName(name);
 
-        // camelize (lower first character) the variable name
-        // pet_id => petId
-        name = camelize(name, LOWERCASE_FIRST_LETTER);
+        if (useLowerCamelCase) {
+            //to camelize it correctly it needs to be lower cased
+            name = camelize(name.toLowerCase(), LOWERCASE_FIRST_LETTER);
+        } else {
+            // camelize (lower first character) the variable name
+            // pet_id => petId
+            name = camelize(name, LOWERCASE_FIRST_LETTER);
+        }
 
         if (name.matches("^\\d.*")) {
             name = "n" + name;