Implement IDL enum feature (lunchclass#110)

Implement IDL enum feature. Some part of codes should be generated
automatically at another files but this patch doesn't do that yet.
So, it will be finished in follow-up patch.

ISSUE=lunchclass#80

core/idl_types.h

@@ -25,5 +25,7 @@ struct IDLLongLong final : public IDLBaseHelper<int64_t> {};
 struct IDLLong final : public IDLBaseHelper<int32_t> {};
 struct IDLShort final : public IDLBaseHelper<int16_t> {};
 struct IDLString final : public IDLBaseHelper<std::string> {};
+// FIXME(Hwansung): should be generated automatically in another file.
+struct IDLOperationType final : public IDLBaseHelper<std::string> {};
 
 #endif  // CORE_IDL_TYPES_H_

core/native_type_traits.h

@@ -160,4 +160,43 @@ struct NativeTypeTraits<IDLString> : public NativeTypeTraitsBase<IDLString> {
   }
 };
 
+// FIXME(Hwansung): should be generated automatically in another file.
+template <>
+struct NativeTypeTraits<IDLOperationType>
+    : public NativeTypeTraitsBase<IDLOperationType> {
+  static std::string NativeValue(const Napi::Env& env,
+                                 const Napi::Value& js_value) {
+    if (!js_value.IsString()) {
+      Napi::TypeError::New(env, "It's an invalid string.")
+          .ThrowAsJavaScriptException();
+      return std::string();
+    }
+
+    std::string value = js_value.ToString().Utf8Value();
+    if (!IsValidValue(value)) {
+      Napi::TypeError::New(env, "it not matched with values of enum in idl.")
+          .ThrowAsJavaScriptException();
+      return std::string();
+    }
+
+    return js_value.ToString().Utf8Value();
+  }
+
+  static bool IsTypeEquals(const Napi::Value& js_value) {
+    if (js_value.IsString()) {
+      std::string value = js_value.ToString().Utf8Value();
+      return IsValidValue(value);
+    }
+    return false;
+  }
+
+  static bool IsValidValue(std::string value) {
+    if (value.compare("add") == 0 || value.compare("sub") == 0 ||
+        value.compare("mul") == 0 || value.compare("div") == 0) {
+      return true;
+    }
+    return false;
+  }
+};
+
 #endif  // CORE_NATIVE_TYPE_TRAITS_H_

examples/calculator.cc

@@ -60,3 +60,18 @@ double Calculator::Div(double number1, double number2) {
 bool Calculator::IsEquals(int16_t number1, int16_t number2) {
   return number1 == number2;
 }
+
+double Calculator::Calculate(const std::string& operatorStr,
+                             double number1,
+                             double number2) {
+  if (operatorStr.compare("add") == 0) {
+    return number1 + number2;
+  } else if (operatorStr.compare("sub") == 0) {
+    return number1 - number2;
+  } else if (operatorStr.compare("mul") == 0) {
+    return number1 * number2;
+  } else if (operatorStr.compare("div") == 0) {
+    return number1 / number2;
+  }
+  return 0;
+}

examples/calculator.h

@@ -32,6 +32,9 @@ class Calculator {
   int64_t Mul(int64_t number1, int64_t number2);
   double Div(double number1, double number2);
   bool IsEquals(int16_t number1, int16_t number2);
+  double Calculate(const std::string& operatorStr,
+                   double number1,
+                   double number2);
 };
 
 #endif  // EXAMPLES_CALCULATOR_H_

examples/calculator.idl

@@ -14,6 +14,13 @@
  * limitations under the License.
  */
 
+ enum OperationType {
+  "add",
+  "sub",
+  "mul",
+  "div"
+};
+
 [
   Constructor(),
   Constructor(long createdTime),
@@ -27,6 +34,7 @@ interface Calculator {
   double mul(double number1, double number2);
   double div(double number1, double number2);
   bool isEquals(short number1, short number2);
+  double calculate(OperationType type, double number1, double number2);
 };
 
 interface TernaryCalculator {

examples/calculator.js

@@ -144,3 +144,24 @@ describe('generate one more bridge classes from one more interfaces', () => {
     assert.equal(ternary_calculator.add(1, 2, 3), 1 + 2 + 3);
   });
 });
+
+describe('enum type test', () => {
+  it('should be equal with expected value', () => {
+    assert.equal(calculator.calculate('add', 1, 2), 3);
+    assert.equal(calculator.calculate('sub', 2, 1), 1);
+    assert.equal(calculator.calculate('mul', 2, 1), 2);
+    assert.equal(calculator.calculate('div', 4, 1), 4);
+  });
+
+  it('should be throw error when invalid argument passed.', () => {
+    assert.throws(() => {
+      calculator.calculate('add', 1, 1, 1);
+    }, RangeError);
+    assert.throws(() => {
+      calculator.calculate(1, 1, 1);
+    }, TypeError);
+    assert.throws(() => {
+      calculator.calculate('not_match_value', 1, 1);
+    }, TypeError);
+  });
+});

generator/parser/idl_definition.ts

@@ -32,4 +32,8 @@ export default abstract class IDLDefinition {
   public isIDLInterface(): boolean {
     return this.raw_idl_definition_info['type'] == 'interface';
   }
+
+  public isIDLEnum(): boolean {
+    return this.raw_idl_definition_info['type'] == 'enum';
+  }
 }

generator/parser/idl_definition_factory.ts

@@ -15,12 +15,15 @@
  */
 
 import IDLDefinition from './idl_definition';
+import IDLEnum from './idl_enum';
 import IDLInterface from './idl_interface';
 
 export default class IDLDefinitionFactory {
   static create(raw_idl_definition_info: {}): IDLDefinition {
     if (this.isIDLInterface(raw_idl_definition_info)) {
       return new IDLInterface(raw_idl_definition_info);
+    } else if (this.isIDLEnum(raw_idl_definition_info)) {
+      return new IDLEnum(raw_idl_definition_info);
     }
 
     return null;
@@ -29,4 +32,7 @@ export default class IDLDefinitionFactory {
   private static isIDLInterface(raw_idl_definition_info: {}): boolean {
     return raw_idl_definition_info['type'] == 'interface';
   }
+  private static isIDLEnum(raw_idl_definition_info: {}): boolean {
+    return raw_idl_definition_info['type'] == 'enum';
+  }
 }

generator/parser/idl_enum.ts

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2017 The Bacardi Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import IDLDefinition from './idl_definition';
+
+export default class IDLEnum extends IDLDefinition {
+  values: string[];
+
+  constructor(raw_idl_enum_info: {}) {
+    super(raw_idl_enum_info['name'], raw_idl_enum_info);
+
+    this.values = [];
+    raw_idl_enum_info['values'].forEach(raw_value_info => {
+      this.values.push(raw_value_info);
+    });
+  }
+
+  render(): void {
+    // TODO(zino): We should implement this function.
+  }
+}

template/interface_cpp.njk

@@ -73,6 +73,9 @@ Napi::Value {{name}}Bridge::{{member.name | camelcase}}(const Napi::CallbackInfo
   {% for argument in member.arguments %}
   auto {{argument.name}} = NativeTypeTraits<IDL{{argument.type | camelcase-}}
       >::NativeValue(info.Env(), info[{{loop.index - 1}}]);
+  if (info.Env().IsExceptionPending()) {
+    return Napi::Value();
+  }
   {% endfor %}
 
   {% if member.type != "void" %}