fix(directive-parser) add support for bound attributes

src/parsers/directive.parser.ts

@@ -3,7 +3,18 @@ import {
 	TmplAstNode as Node,
 	TmplAstElement as Element,
 	TmplAstText as Text,
-	TmplAstTemplate as Template
+	TmplAstTemplate as Template,
+	TmplAstTextAttribute as TextAttribute,
+	TmplAstBoundAttribute as BoundAttribute,
+	AST,
+	ASTWithSource,
+	LiteralPrimitive,
+	Conditional,
+	Binary,
+	BindingPipe,
+	Interpolation,
+	LiteralArray,
+	LiteralMap
 } from '@angular/compiler';
 
 import { ParserInterface } from './parser.interface';
@@ -24,13 +35,22 @@ export class DirectiveParser implements ParserInterface {
 		const elements: ElementLike[] = this.getElementsWithTranslateAttribute(nodes);
 
 		elements.forEach((element) => {
-			const attr = this.getAttribute(element, TRANSLATE_ATTR_NAME);
-			if (attr) {
-				collection = collection.add(attr);
+			const attribute = this.getAttribute(element, TRANSLATE_ATTR_NAME);
+			if (attribute?.value) {
+				collection = collection.add(attribute.value);
 				return;
 			}
+
+			const boundAttribute = this.getBoundAttribute(element, TRANSLATE_ATTR_NAME);
+			if (boundAttribute?.value) {
+				this.getLiteralPrimitives(boundAttribute.value).forEach((literalPrimitive) => {
+					collection = collection.add(literalPrimitive.value);
+				});
+				return;
+			}
+
 			const textNodes = this.getTextNodes(element);
-			textNodes.forEach((textNode: Text) => {
+			textNodes.forEach((textNode) => {
 				collection = collection.add(textNode.value.trim());
 			});
 		});
@@ -43,16 +63,18 @@ export class DirectiveParser implements ParserInterface {
 	 */
 	protected getElementsWithTranslateAttribute(nodes: Node[]): ElementLike[] {
 		let elements: ElementLike[] = [];
-		nodes.filter(this.isElementLike)
-			.forEach((element) => {
-				if (this.hasAttribute(element, TRANSLATE_ATTR_NAME)) {
-					elements = [...elements, element];
-				}
-				const childElements = this.getElementsWithTranslateAttribute(element.children);
-				if (childElements.length) {
-					elements = [...elements, ...childElements];
-				}
-			});
+		nodes.filter(this.isElementLike).forEach((element) => {
+			if (this.hasAttribute(element, TRANSLATE_ATTR_NAME)) {
+				elements = [...elements, element];
+			}
+			if (this.hasBoundAttribute(element, TRANSLATE_ATTR_NAME)) {
+				elements = [...elements, element];
+			}
+			const childElements = this.getElementsWithTranslateAttribute(element.children);
+			if (childElements.length) {
+				elements = [...elements, ...childElements];
+			}
+		});
 		return elements;
 	}
 
@@ -76,8 +98,59 @@ export class DirectiveParser implements ParserInterface {
 	 * Get attribute value if present on element
 	 * @param element
 	 */
-	protected getAttribute(element: ElementLike, name: string): string | undefined {
-		return element.attributes.find((attribute) => attribute.name === name)?.value;
+	protected getAttribute(element: ElementLike, name: string): TextAttribute {
+		return element.attributes.find((attribute) => attribute.name === name);
+	}
+
+	/**
+	 * Check if bound attribute is present on element
+	 * @param element
+	 * @param name
+	 */
+	protected hasBoundAttribute(element: ElementLike, name: string): boolean {
+		return this.getBoundAttribute(element, name) !== undefined;
+	}
+
+	/**
+	 * Get bound attribute if present on element
+	 * @param element
+	 * @param name
+	 */
+	protected getBoundAttribute(element: ElementLike, name: string): BoundAttribute {
+		return element.inputs.find((input) => input.name === name);
+	}
+
+	/**
+	 * Get literal primitives from expression
+	 * @param exp
+	 */
+	protected getLiteralPrimitives(exp: AST): LiteralPrimitive[] {
+		if (exp instanceof LiteralPrimitive) {
+			return [exp];
+		}
+
+		let visit: AST[] = [];
+		if (exp instanceof Interpolation) {
+			visit = exp.expressions;
+		} else if (exp instanceof LiteralArray) {
+			visit = exp.expressions;
+		} else if (exp instanceof LiteralMap) {
+			visit = exp.values;
+		} else if (exp instanceof BindingPipe) {
+			visit = [exp.exp];
+		} else if (exp instanceof Conditional) {
+			visit = [exp.trueExp, exp.falseExp];
+		} else if (exp instanceof Binary) {
+			visit = [exp.left, exp.right];
+		} else if (exp instanceof ASTWithSource) {
+			visit = [exp.ast];
+		}
+
+		let results: LiteralPrimitive[] = [];
+		visit.forEach((child) => {
+			results = [...results, ...this.getLiteralPrimitives(child)];
+		});
+		return results;
 	}
 
 	/**
@@ -104,5 +177,4 @@ export class DirectiveParser implements ParserInterface {
 	protected parseTemplate(template: string, path: string): Node[] {
 		return parseTemplate(template, path).nodes;
 	}
-
 }