chore(dgeni): better extraction of directive metadata

* No longer extracts the directive/component metadata using Regular Expressions.
* Fixes that inherited properties from interfaces or super-classes are not showing up as inputs/outputs if they are specified in the component/directive metadata.
* Now handles multi-line selectors (this was not possible using the Regular Expression)
* Fixes that merged inherited properties have a reference to the original document (this causes unexpected behavior; if properties are updated).

References angular#9299

Author: devversion

tools/dgeni/common/component-metadata.ts

@@ -0,0 +1,74 @@
+import {CategorizedClassDoc} from './dgeni-definitions';
+import {
+  ArrayLiteralExpression,
+  CallExpression,
+  ObjectLiteralExpression,
+  PropertyAssignment,
+  StringLiteral, SyntaxKind
+} from 'typescript';
+
+export type ComponentMetadata = Map<string, any>;
+
+/**
+ * Determines the component metadata from the specified Dgeni class doc. The resolved
+ * component metadata will be stored in a Map.
+ *
+ * Currently only string literal assignments and array literal assignments are supported.
+ *
+ * ```ts
+ * @Component({
+ *   inputs: ["red", "blue"],
+ *   exportAs: "test"
+ * })
+ * export class MyComponent {}
+ * ```
+ */
+export function getComponentMetadata(classDoc: CategorizedClassDoc): ComponentMetadata | null {
+  const declaration = classDoc.symbol.valueDeclaration;
+
+  if (!declaration || !declaration.decorators) {
+    return null;
+  }
+
+  const componentDecorator = declaration.decorators
+    .filter(decorator => decorator.expression)
+    .filter(decorator => decorator.expression.kind === SyntaxKind.CallExpression)
+    .find(decorator => (decorator.expression as any).expression.getText() === 'Component' ||
+                       (decorator.expression as any).expression.getText() === 'Directive');
+
+  if (!componentDecorator) {
+    return null;
+  }
+
+  // Since the actual decorator expression is by default a LeftHandSideExpression, and TypeScript
+  // doesn't allow a casting it to a CallExpression, we have to cast it to "any" before.
+  const expression = (componentDecorator.expression as any) as CallExpression;
+
+  // The argument length of the CallExpression needs to be exactly one, because it's the single
+  // JSON object in the @Component decorator.
+  if (expression.arguments.length !== 1) {
+    return null;
+  }
+
+  const objectExpression = expression.arguments[0] as ObjectLiteralExpression;
+  const resultMetadata = new Map<string, any>();
+
+  objectExpression.properties.forEach((prop: PropertyAssignment) => {
+
+    // Support ArrayLiteralExpression assignments in the component metadata.
+    if (prop.initializer.kind === SyntaxKind.ArrayLiteralExpression) {
+      const arrayData = (prop.initializer as ArrayLiteralExpression).elements
+          .map((literal: StringLiteral) => literal.text);
+
+      resultMetadata.set(prop.name.getText(), arrayData);
+    }
+
+    // Support normal StringLiteral and NoSubstitutionTemplateLiteral assignments
+    if (prop.initializer.kind === SyntaxKind.StringLiteral ||
+        prop.initializer.kind === SyntaxKind.NoSubstitutionTemplateLiteral) {
+      resultMetadata.set(prop.name.getText(), (prop.initializer as StringLiteral).text);
+    }
+  });
+
+  return resultMetadata;
+}

tools/dgeni/common/decorators.ts

@@ -6,6 +6,7 @@
 import {ClassExportDoc} from 'dgeni-packages/typescript/api-doc-types/ClassExportDoc';
 import {PropertyMemberDoc} from 'dgeni-packages/typescript/api-doc-types/PropertyMemberDoc';
 import {MemberDoc} from 'dgeni-packages/typescript/api-doc-types/MemberDoc';
+import {CategorizedClassDoc} from './dgeni-definitions';
 
 const SELECTOR_BLACKLIST = new Set([
   '[portal]',
@@ -49,28 +50,16 @@ export function isNgModule(doc: ClassExportDoc) {
   return hasClassDecorator(doc, 'NgModule');
 }
 
-export function isDirectiveOutput(doc: PropertyMemberDoc) {
-  return hasMemberDecorator(doc, 'Output');
-}
-
-export function isDirectiveInput(doc: PropertyMemberDoc) {
-  return hasMemberDecorator(doc, 'Input');
-}
-
 export function isDeprecatedDoc(doc: any) {
   return (doc.tags && doc.tags.tags || []).some((tag: any) => tag.tagName === 'deprecated');
 }
 
-export function getDirectiveInputAlias(doc: PropertyMemberDoc) {
-  return isDirectiveInput(doc) ? doc.decorators!.find(d => d.name == 'Input')!.arguments![0] : '';
-}
-
-export function getDirectiveOutputAlias(doc: PropertyMemberDoc) {
-  return isDirectiveOutput(doc) ? doc.decorators!.find(d => d.name == 'Output')!.arguments![0] : '';
-}
+export function getDirectiveSelectors(classDoc: CategorizedClassDoc) {
+  if (!classDoc.componentMetadata) {
+    return;
+  }
 
-export function getDirectiveSelectors(classDoc: ClassExportDoc) {
-  const directiveSelectors = getMetadataProperty(classDoc, 'selector');
+  const directiveSelectors: string = classDoc.componentMetadata.get('selector');
 
   if (directiveSelectors) {
     // Filter blacklisted selectors and remove line-breaks in resolved selectors.
@@ -79,18 +68,6 @@ export function getDirectiveSelectors(classDoc: ClassExportDoc) {
   }
 }
 
-export function getMetadataProperty(doc: ClassExportDoc, property: string) {
-  const metadata = doc.decorators!
-    .find(d => d.name === 'Component' || d.name === 'Directive')!.arguments![0];
-
-  // Use a Regex to determine the given metadata property. This is necessary, because we can't
-  // parse the JSON due to environment variables inside of the JSON (e.g module.id)
-  const matches = new RegExp(`${property}s*:\\s*(?:"|'|\`)((?:.|\\n|\\r)+?)(?:"|'|\`)`)
-    .exec(metadata);
-
-  return matches && matches[1].trim();
-}
-
 export function hasMemberDecorator(doc: MemberDoc, decoratorName: string) {
   return doc.docType == 'member' && hasDecorator(doc, decoratorName);
 }

tools/dgeni/common/dgeni-definitions.ts

@@ -18,6 +18,7 @@ export interface CategorizedClassDoc extends ClassExportDoc, CategorizedClassLik
   directiveExportAs?: string | null;
   directiveSelectors?: string[];
   extendedDoc: ClassLikeExportDoc | null;
+  componentMetadata: Map<string, any> | null;
 }
 
 /** Extended Dgeni property-member document that includes extracted Angular metadata. */

tools/dgeni/common/property-bindings.ts

@@ -0,0 +1,54 @@
+import {PropertyMemberDoc} from 'dgeni-packages/typescript/api-doc-types/PropertyMemberDoc';
+import {ComponentMetadata} from './component-metadata';
+import {hasMemberDecorator} from './decorators';
+
+/** Interface that describes an Angular property binding. Can be either an input or output. */
+export interface PropertyBinding {
+  name: string;
+  alias?: string;
+}
+
+/**
+ * Detects whether the specified property member is an input. If the property is an input, the
+ * alias and input name will be returned.
+ */
+export function getInputBindingData(doc: PropertyMemberDoc, metadata: ComponentMetadata)
+    : PropertyBinding | undefined {
+  return getBindingPropertyData(doc, metadata, 'inputs', 'Input');
+}
+
+/**
+ * Detects whether the specified property member is an output. If the property is an output, the
+ * alias and output name will be returned.
+ */
+export function getOutputBindingData(doc: PropertyMemberDoc, metadata: ComponentMetadata)
+    : PropertyBinding | undefined {
+  return getBindingPropertyData(doc, metadata, 'outputs', 'Output');
+}
+
+/**
+ * Method that detects the specified type of property binding (either "output" or "input") from
+ * the "@Component" metadata or from the associated decorator on the property.
+ */
+function getBindingPropertyData(doc: PropertyMemberDoc, metadata: ComponentMetadata,
+                                propertyName: string, decoratorName: string) {
+
+  if (metadata) {
+    const metadataValues: string[] = metadata.get(propertyName) || [];
+    const foundValue = metadataValues.find(value => value.split(':')[0] === doc.name);
+
+    if (foundValue) {
+      return {
+        name: doc.name,
+        alias: foundValue.split(':')[1]
+      };
+    }
+  }
+
+  if (hasMemberDecorator(doc, decoratorName)) {
+    return {
+      name: doc.name,
+      alias: doc.decorators!.find(d => d.name == decoratorName)!.arguments![0]
+    };
+  }
+}

tools/dgeni/common/sort-members.ts

@@ -1,4 +1,3 @@
-import {isDirectiveInput, isDirectiveOutput} from './decorators';
 import {CategorizedMethodMemberDoc, CategorizedPropertyMemberDoc} from './dgeni-definitions';
 
 /** Combined type for a categorized method member document. */
@@ -16,13 +15,13 @@ export function sortCategorizedMembers(docA: CategorizedMemberDoc, docB: Categor
   }
 
   // Sort in the order of: Inputs, Outputs, neither
-  if ((isDirectiveInput(docA) && !isDirectiveInput(docB)) ||
-    (isDirectiveOutput(docA) && !isDirectiveInput(docB) && !isDirectiveOutput(docB))) {
+  if ((docA.isDirectiveInput && !docB.isDirectiveInput) ||
+    (docA.isDirectiveOutput && !docB.isDirectiveInput && !docB.isDirectiveOutput)) {
     return -1;
   }
 
-  if ((isDirectiveInput(docB) && !isDirectiveInput(docA)) ||
-    (isDirectiveOutput(docB) && !isDirectiveInput(docA) && !isDirectiveOutput(docA))) {
+  if ((docB.isDirectiveInput && !docA.isDirectiveInput) ||
+    (docB.isDirectiveOutput && !docA.isDirectiveInput && !docA.isDirectiveOutput)) {
     return 1;
   }
 

tools/dgeni/processors/categorizer.ts

@@ -1,26 +1,16 @@
 import {DocCollection, Processor} from 'dgeni';
 import {MethodMemberDoc} from 'dgeni-packages/typescript/api-doc-types/MethodMemberDoc';
+import {getComponentMetadata} from '../common/component-metadata';
 import {
-  decorateDeprecatedDoc,
-  getDirectiveInputAlias,
-  getDirectiveOutputAlias,
-  getDirectiveSelectors,
-  getMetadataProperty,
-  isDirective,
-  isDirectiveInput,
-  isDirectiveOutput,
-  isMethod,
-  isNgModule,
-  isProperty,
+  decorateDeprecatedDoc, getDirectiveSelectors, isDirective, isMethod, isNgModule, isProperty,
   isService
 } from '../common/decorators';
 import {
-  CategorizedClassDoc,
-  CategorizedClassLikeDoc,
-  CategorizedMethodMemberDoc,
+  CategorizedClassDoc, CategorizedClassLikeDoc, CategorizedMethodMemberDoc,
   CategorizedPropertyMemberDoc
 } from '../common/dgeni-definitions';
 import {normalizeMethodParameters} from '../common/normalize-method-parameters';
+import {getInputBindingData, getOutputBindingData} from '../common/property-bindings';
 import {sortCategorizedMembers} from '../common/sort-members';
 
 
@@ -56,6 +46,11 @@ export class Categorizer implements Processor {
       .filter(isProperty)
       .filter(filterDuplicateMembers) as CategorizedPropertyMemberDoc[];
 
+    // Special decorations for real class documents that don't apply for interfaces.
+    if (classLikeDoc.docType === 'class') {
+      this.decorateClassDoc(classLikeDoc as CategorizedClassDoc);
+    }
+
     // Call decorate hooks that can modify the method and property docs.
     classLikeDoc.methods.forEach(doc => this.decorateMethodDoc(doc));
     classLikeDoc.properties.forEach(doc => this.decoratePropertyDoc(doc));
@@ -65,11 +60,6 @@ export class Categorizer implements Processor {
     // Sort members
     classLikeDoc.methods.sort(sortCategorizedMembers);
     classLikeDoc.properties.sort(sortCategorizedMembers);
-
-    // Special decorations for real class documents that don't apply for interfaces.
-    if (classLikeDoc.docType === 'class') {
-      this.decorateClassDoc(classLikeDoc as CategorizedClassDoc);
-    }
   }
 
   /**
@@ -82,12 +72,13 @@ export class Categorizer implements Processor {
     // clauses for the Dgeni document. To make the template syntax simpler and more readable,
     // store the extended class in a variable.
     classDoc.extendedDoc = classDoc.extendsClauses[0] ? classDoc.extendsClauses[0].doc! : null;
+    classDoc.componentMetadata = getComponentMetadata(classDoc);
 
     // Categorize the current visited classDoc into its Angular type.
-    if (isDirective(classDoc)) {
+    if (isDirective(classDoc) && classDoc.componentMetadata) {
       classDoc.isDirective = true;
-      classDoc.directiveExportAs = getMetadataProperty(classDoc, 'exportAs');
-      classDoc.directiveSelectors =  getDirectiveSelectors(classDoc);
+      classDoc.directiveExportAs = classDoc.componentMetadata.get('exportAs');
+      classDoc.directiveSelectors = getDirectiveSelectors(classDoc);
     } else if (isService(classDoc)) {
       classDoc.isService = true;
     } else if (isNgModule(classDoc)) {
@@ -114,13 +105,17 @@ export class Categorizer implements Processor {
   private decoratePropertyDoc(propertyDoc: CategorizedPropertyMemberDoc) {
     decorateDeprecatedDoc(propertyDoc);
 
-    // TODO(devversion): detect inputs based on the `inputs` property in the component metadata.
+    const metadata = propertyDoc.containerDoc.docType === 'class' ?
+        (propertyDoc.containerDoc as CategorizedClassDoc).componentMetadata : null;
+
+    const inputMetadata = metadata ? getInputBindingData(propertyDoc, metadata) : null;
+    const outputMetadata = metadata ? getOutputBindingData(propertyDoc, metadata) : null;
 
-    propertyDoc.isDirectiveInput = isDirectiveInput(propertyDoc);
-    propertyDoc.directiveInputAlias = getDirectiveInputAlias(propertyDoc);
+    propertyDoc.isDirectiveInput = !!inputMetadata;
+    propertyDoc.directiveInputAlias = (inputMetadata && inputMetadata.alias) || '';
 
-    propertyDoc.isDirectiveOutput = isDirectiveOutput(propertyDoc);
-    propertyDoc.directiveOutputAlias = getDirectiveOutputAlias(propertyDoc);
+    propertyDoc.isDirectiveOutput = !!outputMetadata;
+    propertyDoc.directiveOutputAlias = (outputMetadata && outputMetadata.alias) || '';
   }
 }
 

tools/dgeni/processors/merge-inherited-properties.ts

@@ -28,7 +28,14 @@ export class MergeInheritedProperties implements Processor {
 
   private addMemberDocIfNotPresent(destination: ClassExportDoc, memberDoc: MemberDoc) {
     if (!destination.members.find(member => member.name === memberDoc.name)) {
-      destination.members.push(memberDoc);
+      // To be able to differentiate between member docs from the heritage clause and the
+      // member doc for the destination class, we clone the member doc. It's important to keep
+      // the prototype and reference because later, Dgeni identifies members and properties
+      // by using an instance comparison.
+      const newMemberDoc = Object.assign(Object.create(memberDoc), memberDoc);
+      newMemberDoc.containerDoc = destination;
+
+      destination.members.push(newMemberDoc);
     }
   }
 }