refactor: use promise.mapSeries

src/util/error.js

@@ -0,0 +1,40 @@
+function TokenizationError(message, input, line) {
+    if(Error.captureStackTrace){
+        Error.captureStackTrace(this, this.constructor);
+    }
+    this.name = this.constructor.name;
+
+    this.message = message;
+    this.input = input;
+    this.line = line;
+}
+TokenizationError.prototype = Object.create(Error.prototype);
+TokenizationError.prototype.constructor = TokenizationError;
+
+function ParseError(message, input, line, e) {
+    if(Error.captureStackTrace){
+        Error.captureStackTrace(this, this.constructor);
+    }
+    this.name = this.constructor.name;
+    this.originalError = e;
+
+    this.message = message;
+    this.input = input;
+    this.line = line;
+}
+ParseError.prototype = Object.create(Error.prototype);
+ParseError.prototype.constructor = ParseError;
+
+function RenderBreak(message){
+    if(Error.captureStackTrace){
+        Error.captureStackTrace(this, this.constructor);
+    }
+    this.name = this.constructor.name;
+    this.message = message;
+}
+RenderBreak.prototype = Object.create(Error.prototype);
+RenderBreak.prototype.constructor = RenderBreak;
+
+module.exports = {
+    TokenizationError, ParseError, RenderBreak
+};