feat: adding Scala generator

examples/generate-scala-enums/README.md

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+# Scala Enums
+
+A basic example of how to use Modelina and output a Scala enumeration.
+
+## How to run this example
+
+Run this example using:
+
+```sh
+npm i && npm run start
+```
+
+If you are on Windows, use the `start:windows` script instead:
+
+```sh
+npm i && npm run start:windows
+```

examples/generate-scala-enums/index.spec.ts

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+const spy = jest.spyOn(global.console, 'log').mockImplementation(() => {
+  return;
+});
+import { generate } from './index';
+
+describe('Should be able to render Kotlin Enums', () => {
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+  test('and should log expected output to console', async () => {
+    await generate();
+    expect(spy.mock.calls.length).toEqual(1);
+    expect(spy.mock.calls[0]).toMatchSnapshot();
+  });
+});

examples/generate-scala-enums/index.ts

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+import { ScalaGenerator } from '../../src/generators/scala';
+
+const generator = new ScalaGenerator();
+const jsonSchemaDraft7 = {
+  $schema: 'http://json-schema.org/draft-07/schema#',
+  additionalProperties: false,
+  $id: 'protocol',
+  type: ['string', 'int', 'boolean'],
+  enum: ['HTTP', 1, 'HTTPS', true]
+};
+
+export async function generate(): Promise<void> {
+  const models = await generator.generate(jsonSchemaDraft7);
+  for (const model of models) {
+    console.log(model.result);
+  }
+}
+if (require.main === module) {
+  generate();
+}

examples/generate-scala-enums/package.json

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+{
+  "config": {
+    "example_name": "generate-scala-enums"
+  },
+  "scripts": {
+    "install": "cd ../.. && npm i",
+    "start": "../../node_modules/.bin/ts-node --cwd ../../ ./examples/$npm_package_config_example_name/index.ts",
+    "start:windows": "..\\..\\node_modules\\.bin\\ts-node --cwd ..\\..\\ .\\examples\\%npm_package_config_example_name%\\index.ts",
+    "test": "../../node_modules/.bin/jest --config=../../jest.config.js ./examples/$npm_package_config_example_name/index.spec.ts",
+    "test:windows": "..\\..\\node_modules\\.bin\\jest --config=..\\..\\jest.config.js examples/%npm_package_config_example_name%/index.spec.ts"
+  }
+}

examples/generate-scala-models/README.md

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+# Scala Data Models
+
+A basic example of how to use Modelina and output a Scala data model.
+
+## How to run this example
+
+Run this example using:
+
+```sh
+npm i && npm run start
+```
+
+If you are on Windows, use the `start:windows` script instead:
+
+```sh
+npm i && npm run start:windows
+```

examples/generate-scala-models/index.spec.ts

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+const spy = jest.spyOn(global.console, 'log').mockImplementation(() => {
+  return;
+});
+import { generate } from './index';
+
+describe('Should be able to render Kotlin Models', () => {
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+  test('and should log expected output to console', async () => {
+    await generate();
+    expect(spy.mock.calls.length).toEqual(3);
+    expect(spy.mock.calls[0]).toMatchSnapshot();
+  });
+});

examples/generate-scala-models/index.ts

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+import { ScalaGenerator } from '../../src/generators/scala';
+
+const generator = new ScalaGenerator();
+const jsonSchemaDraft7 = {
+  $schema: 'http://json-schema.org/draft-07/schema#',
+  type: 'object',
+  additionalProperties: false,
+  properties: {
+    email: {
+      type: 'string',
+      format: 'email'
+    },
+    cache: {
+      type: 'integer'
+    },
+    website: {
+      type: 'object',
+      additionalProperties: false,
+      properties: {
+        domain: {
+          type: 'string',
+          format: 'url'
+        },
+        protocol: {
+          type: 'string',
+          enum: ['HTTP', 'HTTPS']
+        }
+      }
+    }
+  }
+};
+
+export async function generate(): Promise<void> {
+  const models = await generator.generate(jsonSchemaDraft7);
+  for (const model of models) {
+    console.log(model.result);
+  }
+}
+if (require.main === module) {
+  generate();
+}

examples/generate-scala-models/package.json

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+{
+  "config": {
+    "example_name": "generate-scala-models"
+  },
+  "scripts": {
+    "install": "cd ../.. && npm i",
+    "start": "../../node_modules/.bin/ts-node --cwd ../../ ./examples/$npm_package_config_example_name/index.ts",
+    "start:windows": "..\\..\\node_modules\\.bin\\ts-node --cwd ..\\..\\ .\\examples\\%npm_package_config_example_name%\\index.ts",
+    "test": "../../node_modules/.bin/jest --config=../../jest.config.js ./examples/$npm_package_config_example_name/index.spec.ts",
+    "test:windows": "..\\..\\node_modules\\.bin\\jest --config=..\\..\\jest.config.js examples/%npm_package_config_example_name%/index.spec.ts"
+  }
+}

src/generators/scala/Constants.ts

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+import { checkForReservedKeyword } from '../../helpers';
+
+export const RESERVED_SCALA_KEYWORDS = [
+  'abstract',
+  'case',
+  'catch',
+  'class',
+  'def',
+  'do',
+  'else',
+  'extends',
+  'false',
+  'final',
+  'finally',
+  'for',
+  'forSome',
+  'if',
+  'implicit',
+  'import',
+  'lazy',
+  'match',
+  'new',
+  'null',
+  'object',
+  'override',
+  'package',
+  'private',
+  'protected',
+  'return',
+  'sealed',
+  'super',
+  'this',
+  'throw',
+  'trait',
+  'true',
+  'try',
+  'type',
+  'val',
+  'var',
+  'while',
+  'with',
+  'yield'
+];
+
+export function isReservedScalaKeyword(
+  word: string,
+  forceLowerCase = true
+): boolean {
+  return checkForReservedKeyword(word, RESERVED_SCALA_KEYWORDS, forceLowerCase);
+}

src/generators/scala/ScalaConstrainer.ts

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+import { Constraints } from '../../helpers';
+import { ConstrainedEnumValueModel } from '../../models';
+import {
+  defaultEnumKeyConstraints,
+  defaultEnumValueConstraints
+} from './constrainer/EnumConstrainer';
+import { defaultModelNameConstraints } from './constrainer/ModelNameConstrainer';
+import { defaultPropertyKeyConstraints } from './constrainer/PropertyKeyConstrainer';
+import { defaultConstantConstraints } from './constrainer/ConstantConstrainer';
+import { ScalaTypeMapping } from './ScalaGenerator';
+
+function enumFormatToNumberType(
+  enumValueModel: ConstrainedEnumValueModel,
+  format: string | undefined
+): string {
+  switch (format) {
+    case 'integer':
+    case 'int32':
+      return 'Int';
+    case 'long':
+    case 'int64':
+      return 'Long';
+    case 'float':
+      return 'Float';
+    case 'double':
+      return 'Double';
+    default:
+      return Number.isInteger(enumValueModel.value) ? 'Int' : 'Double';
+  }
+}
+
+function fromEnumValueToKotlinType(
+  enumValueModel: ConstrainedEnumValueModel,
+  format: string | undefined
+): string {
+  switch (typeof enumValueModel.value) {
+    case 'boolean':
+      return 'Boolean';
+    case 'number':
+    case 'bigint':
+      return enumFormatToNumberType(enumValueModel, format);
+    case 'object':
+      return 'Any';
+    case 'string':
+      return 'String';
+    default:
+      return 'Any';
+  }
+}
+
+/**
+ * Converts union of different number types to the most strict type it can be.
+ *
+ * int + double = double (long + double, float + double can never happen, otherwise this would be converted to double)
+ * int + float = float (long + float can never happen, otherwise this would be the case as well)
+ * int + long = long
+ *
+ * Basically a copy from JavaConstrainer.ts
+ */
+function interpretUnionValueType(types: string[]): string {
+  if (types.includes('Double')) {
+    return 'Double';
+  }
+
+  if (types.includes('Float')) {
+    return 'Float';
+  }
+
+  if (types.includes('Long')) {
+    return 'Long';
+  }
+
+  return 'Any';
+}
+
+export const ScalaDefaultTypeMapping: ScalaTypeMapping = {
+  Object({ constrainedModel }): string {
+    return constrainedModel.name;
+  },
+  Reference({ constrainedModel }): string {
+    return constrainedModel.name;
+  },
+  Any(): string {
+    return 'Any';
+  },
+  Float({ constrainedModel }): string {
+    return constrainedModel.options.format === 'float' ? 'Float' : 'Double';
+  },
+  Integer({ constrainedModel }): string {
+    return constrainedModel.options.format === 'long' ||
+      constrainedModel.options.format === 'int64'
+      ? 'Long'
+      : 'Int';
+  },
+  String({ constrainedModel }): string {
+    switch (constrainedModel.options.format) {
+      case 'date': {
+        return 'java.time.LocalDate';
+      }
+      case 'time': {
+        return 'java.time.OffsetTime';
+      }
+      case 'dateTime':
+      case 'date-time': {
+        return 'java.time.OffsetDateTime';
+      }
+      case 'binary': {
+        return 'Array[Byte]';
+      }
+      default: {
+        return 'String';
+      }
+    }
+  },
+  Boolean(): string {
+    return 'Boolean';
+  },
+  // Since there are not tuples in Kotlin, we have to return a collection of `Any`
+  Tuple({ options }): string {
+    const isList = options.collectionType && options.collectionType === 'List';
+
+    return isList ? 'List[Any]' : 'Array[Any]';
+  },
+  Array({ constrainedModel, options }): string {
+    const isList = options.collectionType && options.collectionType === 'List';
+    const type = constrainedModel.valueModel.type;
+
+    return isList ? `List[${type}]` : `Array[${type}]`;
+  },
+  Enum({ constrainedModel }): string {
+    const valueTypes = constrainedModel.values.map((enumValue) =>
+      fromEnumValueToKotlinType(enumValue, constrainedModel.options.format)
+    );
+    const uniqueTypes = [...new Set(valueTypes)];
+
+    // Enums cannot handle union types, default to a loose type
+    return uniqueTypes.length > 1
+      ? interpretUnionValueType(uniqueTypes)
+      : uniqueTypes[0];
+  },
+  Union(): string {
+    // No Unions in Kotlin, use Any for now.
+    return 'Any';
+  },
+  Dictionary({ constrainedModel }): string {
+    return `Map[${constrainedModel.key.type}, ${constrainedModel.value.type}]`;
+  }
+};
+
+export const ScalaDefaultConstraints: Constraints = {
+  enumKey: defaultEnumKeyConstraints(),
+  enumValue: defaultEnumValueConstraints(),
+  modelName: defaultModelNameConstraints(),
+  propertyKey: defaultPropertyKeyConstraints(),
+  constant: defaultConstantConstraints()
+};