unite logic for "normal-module-factory" and "context-module-factory"

lib/IgnorePlugin.js

@@ -8,30 +8,60 @@ class IgnorePlugin {
 	constructor(resourceRegExp, contextRegExp) {
 		this.resourceRegExp = resourceRegExp;
 		this.contextRegExp = contextRegExp;
+
+		this.checkIgnore = this.checkIgnore.bind(this);
+	}
+
+	/*
+	 * Only returns true if a "resourceRegExp" exists
+	 * and the resource given matches the regexp.
+	 */
+	checkResouce(resource) {
+		if(!this.resourceRegExp) {
+			return false;
+		}
+		return this.resourceRegExp.test(resource);
+	}
+
+	/*
+	 * Returns true if contextRegExp does not exist
+	 * or if context matches the given regexp.
+	 */
+	checkContext(context) {
+		if(!this.contextRegExp) {
+			return true;
+		}
+		return this.contextRegExp.test(context);
+	}
+
+	/*
+	 * Returns true if result should be ignored.
+	 * false if it shouldn't.
+	 *
+	 * Not that if "contextRegExp" is given, both the "resourceRegExp"
+	 * and "contextRegExp" have to match.
+	 */
+	checkResult(result, callback) {
+		if(!result) {
+			return true;
+		}
+		return this.checkResouce(result.request) && this.checkContext(result.context);
+	}
+
+	checkIgnore(result, callback) {
+		// check if result is ignored
+		if(this.checkResult(result)) {
+			return callback();
+		}
+		return callback(null, result);
 	}
 
 	apply(compiler) {
-		const resourceRegExp = this.resourceRegExp;
-		const contextRegExp = this.contextRegExp;
 		compiler.plugin("normal-module-factory", (nmf) => {
-			nmf.plugin("before-resolve", (result, callback) => {
-				if(!result) return callback();
-				if(resourceRegExp.test(result.request) &&
-					(!contextRegExp || contextRegExp.test(result.context))) {
-					return callback();
-				}
-				return callback(null, result);
-			});
+			nmf.plugin("before-resolve", this.checkIgnore);
 		});
 		compiler.plugin("context-module-factory", (cmf) => {
-			cmf.plugin("before-resolve", (result, callback) => {
-				if(!result) return callback();
-				if(resourceRegExp.test(result.request) &&
-					(!contextRegExp || contextRegExp.test(result.context))) {
-					return callback();
-				}
-				return callback(null, result);
-			});
+			cmf.plugin("before-resolve", this.checkIgnore);
 		});
 	}
 }