feat(text): add text serializer (#555)

commitlint.config.js

@@ -12,6 +12,7 @@ module.exports = {
       'remote',
       'form',
       'json',
+      'text',
       'deps',
       'deps-dev',
     ]],

packages/text-serializer/CHANGELOG.md

@@ -0,0 +1,5 @@
+# Text Serializer Changelog
+
+## 0.1.0
+
+Initial release

packages/text-serializer/README.md

@@ -0,0 +1,47 @@
+# API Elements: Text Serializer
+
+## Usage
+
+Takes an API Element data structure, and returns Text serialized data
+structures, for example:
+
+### Async
+
+```javascript
+const { Fury } = require('@apielements/core');
+const textSerializer = require('@apielements/text-serializer');
+
+const fury = new Fury();
+fury.use(textSerializer);
+
+const api = new fury.minim.elements.String();
+api.attributes.set('default', 'Doe');
+
+const mediaType = 'text/plain';
+fury.serialize({ api, mediaType }, (error, body) => {
+  console.log(body);
+  // "Doe"
+});
+```
+
+
+### Sync
+
+```javascript
+const { Fury } = require('@apielements/core');
+const textSerializer = require('@apielements/text-serializer');
+
+const fury = new Fury();
+fury.use(textSerializer);
+
+const api = new fury.minim.elements.String('Doe');
+const mediaType = 'text/plain';
+try {
+  const body = fury.serialize({ api, mediaType });
+  console.log(body);
+  // Doe
+} catch (error) {
+  console.log(error);
+  // Only primitive elements can be serialized as text/plain
+}
+```

packages/text-serializer/lib/adapter.js

@@ -0,0 +1,36 @@
+const serializeText = require('./serializeText');
+
+const name = 'text';
+const mediaTypes = [
+  'text/plain',
+];
+
+function serialize({ api }) {
+  return new Promise((resolve, reject) => {
+    const done = (error, result) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve(result);
+      }
+    };
+
+    serializeText(api, done);
+  });
+}
+
+function serializeSync({ api }) {
+  const done = (error, result) => {
+    if (error) {
+      throw error;
+    } else {
+      return result;
+    }
+  };
+
+  return serializeText(api, done);
+}
+
+module.exports = {
+  name, mediaTypes, serialize, serializeSync,
+};

packages/text-serializer/lib/serializeText.js

@@ -0,0 +1,42 @@
+function collectElementByIDs(element) {
+  const dataStructures = {};
+  const { parents } = element;
+
+  if (!parents || parents.isEmpty) {
+    return dataStructures;
+  }
+
+  const rootElement = parents.get(parents.length - 1);
+
+  if (rootElement) {
+    rootElement.recursiveChildren.forEach((element) => {
+      // eslint-disable-next-line no-underscore-dangle
+      const isNotEmptyStringElement = element._meta && element._meta.get('id');
+
+      if (isNotEmptyStringElement) {
+        dataStructures[element.id.toValue()] = element;
+      }
+    });
+  }
+
+  return dataStructures;
+}
+
+const isPrimitive = value => value !== undefined && (value !== Object(value));
+
+function serializeText(element, done) {
+  if (element.element === 'dataStructure') {
+    return serializeText(element.content, done);
+  }
+
+  const dataStructures = collectElementByIDs(element);
+  const value = element.valueOf(undefined, dataStructures);
+
+  if (isPrimitive(value)) {
+    return done(null, String(value));
+  }
+
+  return done(new Error('Only primitive elements can be serialized as text/plain'));
+}
+
+module.exports = serializeText;

packages/text-serializer/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@apielements/text-serializer",
+  "version": "0.1.0",
+  "description": "Text serializer for API Elements",
+  "author": "Apiary.io <[email protected]>",
+  "license": "MIT",
+  "main": "./lib/adapter.js",
+  "files": [
+    "lib/adapter.js",
+    "lib/serializeText.js"
+  ],
+  "homepage": "https://github.com/apiaryio/api-elements.js/tree/master/packages/text-serializer",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/apiaryio/api-elements.js.git",
+    "directory": "packages/text-serializer"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
+    "test": "mocha test"
+  },
+  "peerDependencies": {
+    "@apielements/core": ">=0.1.0 <0.3.0"
+  },
+  "devDependencies": {
+    "@apielements/core": ">=0.1.0 <0.3.0",
+    "chai": "^4.2.0",
+    "eslint": "^5.16.0",
+    "mocha": "^7.1.1"
+  },
+  "engines": {
+    "node": ">=8"
+  }
+}

packages/text-serializer/test/adapter-test.js

@@ -0,0 +1,58 @@
+const { expect } = require('chai');
+const { Fury } = require('@apielements/core');
+const adapter = require('../lib/adapter');
+
+describe('Text Serializer Adapter', () => {
+  let fury;
+
+  before(() => {
+    fury = new Fury();
+    fury.use(adapter);
+  });
+
+  it('has a name', () => {
+    expect(adapter.name).to.equal('text');
+  });
+
+  it('has a text/plain media type', () => {
+    expect(adapter.mediaTypes).to.deep.equal(['text/plain']);
+  });
+
+  describe('using serialize', () => {
+    it('can serialize a primitive element', (done) => {
+      const element = new fury.minim.elements.String('hello world');
+
+      fury.serialize({ api: element, mediaType: 'text/plain' }, (error, result) => {
+        expect(error).to.be.null;
+        expect(result).to.equal('hello world');
+        done();
+      });
+    });
+
+    it('errors with a non-primitive element', (done) => {
+      const element = new fury.minim.elements.Object({ message: 'Hello world' });
+
+      fury.serialize({ api: element, mediaType: 'text/plain' }, (error, result) => {
+        expect(error.message).to.equal('Only primitive elements can be serialized as text/plain');
+        expect(result).to.be.undefined;
+        done();
+      });
+    });
+  });
+
+  describe('using serializeSync', () => {
+    it('can serialize a primitive element', () => {
+      const element = new fury.minim.elements.String('hello world');
+      const result = fury.serializeSync({ api: element, mediaType: 'text/plain' });
+
+      expect(result).to.equal('hello world');
+    });
+
+    it('errors with a non-primitive element', () => {
+      const element = new fury.minim.elements.Object({ message: 'Hello world' });
+
+      expect(() => fury.serializeSync({ api: element, mediaType: 'text/plain' }))
+        .to.throw('Only primitive elements can be serialized as text/plain');
+    });
+  });
+});

packages/text-serializer/test/serializeText-test.js

@@ -0,0 +1,93 @@
+const { expect } = require('chai');
+const { Fury } = require('@apielements/core');
+const serializeText = require('../lib/serializeText');
+
+const { minim: namespace } = new Fury();
+
+const done = (error, result) => {
+  if (error) {
+    throw error;
+  } else {
+    return result;
+  }
+};
+
+describe('#serializeText', () => {
+  it('can serialize a primitive element with value', () => {
+    const stringElement = new namespace.elements.String('hello world');
+    const numberElement = new namespace.elements.Number(1);
+    const booleanElement = new namespace.elements.Boolean(true);
+    const nullElement = new namespace.elements.Null();
+
+    expect(serializeText(stringElement, done)).to.equal('hello world');
+    expect(serializeText(numberElement, done)).to.equal('1');
+    expect(serializeText(booleanElement, done)).to.equal('true');
+    expect(serializeText(nullElement, done)).to.equal('null');
+  });
+
+  it('can serialize an enum element with primitive values', () => {
+    const enumElement = new namespace.elements.Enum();
+    enumElement.enumerations = ['north', 'east', 'south', 'west'];
+
+    expect(serializeText(enumElement, done)).to.equal('north');
+  });
+
+  it('can serialize a primitive element with default value', () => {
+    const element = new namespace.elements.String();
+    element.attributes.set('default', 'hello world');
+
+    expect(serializeText(element, done)).to.equal('hello world');
+  });
+
+  it('can serialize an element with references via parent tree', () => {
+    const element = new namespace.elements.Element();
+    element.element = 'error';
+
+    const error = new namespace.elements.Element();
+    error.element = 'message';
+    error.id = 'error';
+
+    new namespace.elements.Category([
+      new namespace.elements.Category([
+        new namespace.elements.String('error message', { id: 'message' }),
+        error,
+      ], { classes: ['dataStructures'] }),
+      new namespace.elements.Category([
+        element,
+      ]),
+    ]).freeze();
+
+    expect(serializeText(element, done)).to.equal('error message');
+  });
+
+  it('can serialize a dataStructure element', () => {
+    const element = new namespace.elements.DataStructure(
+      new namespace.elements.String('hello world')
+    );
+
+    expect(serializeText(element, done)).to.equal('hello world');
+  });
+
+  it('can serialize from referenced element', () => {
+    const element = new namespace.elements.Element();
+    element.element = 'ref';
+    element.content = 'message';
+
+    new namespace.elements.Category([
+      new namespace.elements.String('hello world', { id: 'message' }),
+      element,
+    ]).freeze();
+
+    expect(serializeText(element, done)).to.equal('hello world');
+  });
+
+  it('errors with a non primitive element', () => {
+    const objectElement = new namespace.elements.Object({ message: 'Hello world' });
+    const arrayElement = new namespace.elements.Array(['Hello', 'Doe']);
+    const emptyEnumElement = new namespace.elements.Enum();
+
+    expect(() => serializeText(objectElement, done)).to.throw('Only primitive elements can be serialized as text/plain');
+    expect(() => serializeText(arrayElement, done)).to.throw('Only primitive elements can be serialized as text/plain');
+    expect(() => serializeText(emptyEnumElement, done)).to.throw('Only primitive elements can be serialized as text/plain');
+  });
+});