refactor: tests for tags

src/error.js

@@ -1,20 +1,24 @@
-function TokenizationError(message, input, line, stack) {
-    this.name = "TokenizationError";
-    this.message = (message || "");
-    this.input = input;
-    this.line = line;
-    if(stack) this.stack = stack;
-}
-TokenizationError.prototype = Error.prototype;
+const util = require('util');
 
-function ParseError(message, input, line, stack) {
-    this.name = "ParseError";
-    this.message = (message || "");
+function TokenizationError(message, input, line) {
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+
+    this.message = message || "";
     this.input = input;
     this.line = line;
-    if(stack) this.stack = stack;
 }
-ParseError.prototype = Error.prototype;
+util.inherits(TokenizationError, Error);
+
+function ParseError(message, input, line) {
+    Error.captureStackTrace(this, this.constructor);
+    this.name = "ParseError";
+
+    this.message = message || "";
+    this.input = input;
+    this.line = line;
+}
+util.inherits(ParseError, Error);
 
 module.exports = {
     TokenizationError, ParseError

src/parser.js

@@ -1,5 +1,4 @@
 const lexical = require('./lexical.js');
-const error = require('./error.js');
 const ParseError = require('./error.js').ParseError;
 
 module.exports = function(Tag, Filter) {
@@ -60,7 +59,7 @@ module.exports = function(Tag, Filter) {
                     return token;
             }
         } catch (e) {
-            throw new ParseError(e.message, token.input, token.line, e.stack);
+            throw new ParseError(e.message, token.input, token.line);
         }
     }
 

src/scope.js

@@ -1,6 +1,5 @@
 const _ = require('lodash');
 const lexical = require('./lexical.js');
-const error = require('./error.js');
 
 var scope = {
     get: function(str) {
@@ -21,7 +20,7 @@ var scope = {
         return this;
     },
     push: function(ctx) {
-        if (!ctx) error(`trying to push ${ctx} into scopes`);
+        if (!ctx) throw new Error(`trying to push ${ctx} into scopes`);
         return this.scopes.push(ctx);
     },
     pop: function() {
@@ -31,6 +30,6 @@ var scope = {
 
 exports.factory = function(_ctx) {
     var ctx = Object.create(scope);
-    ctx.scopes = _ctx ? [_ctx] : [];
+    ctx.scopes = [_ctx || {}];
     return ctx;
 };