Fix nested funcs (#28)

* fixes #25: many nested functions

* asserting issue and pr templates aren't optional

Author: shellscape

.github/ISSUE_TEMPLATE.md

@@ -1,7 +1,7 @@
 <!--
-  Please note: This template is not optional. Please fill in all fields and
-  questions otherwise the issue may be closed. Please provide actual technical
-  information about errors, if an error has occured.
+  Please note: This template is *not* optional. Please fill in all fields and
+  questions, otherwise *the issue may be closed*. Please provide actual technical
+  information about errors, if an error has occurred.
 -->
 
 * Node Version:

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,3 +1,6 @@
+<!-- This template is *not* optional. If you remove this template or choose
+not to complete it, your PR may be closed without review -->
+
 **Which issue #** if any, does this resolve?
 
 <!-- PRs must be accompanied by related tests -->

lib/parser.js

@@ -29,6 +29,8 @@ module.exports = class Parser {
   constructor (input, options) {
     const defaults = { loose: false };
 
+    // cache needs to be an array for values with more than 1 level of function nesting
+    this.cache = [];
     this.input = input;
     this.options = Object.assign({}, defaults, options);
     this.position = 0;
@@ -266,7 +268,6 @@ module.exports = class Parser {
 
     if (last && last.type === 'func' && last.unbalanced < 0) {
       last.unbalanced = 0; // ok we're ready to add parens now
-      this.cache = this.current;
       this.current = last;
     }
 
@@ -345,7 +346,7 @@ module.exports = class Parser {
 
     this.position ++;
 
-    if (this.position >= this.tokens.length - 1) {
+    if (this.position >= this.tokens.length - 1 && !this.current.unbalanced) {
       return;
     }
 
@@ -355,9 +356,8 @@ module.exports = class Parser {
       this.error('Expected opening parenthesis', token);
     }
 
-    if (!this.current.unbalanced && this.cache) {
-      this.current = this.cache;
-      this.cache = null;
+    if (!this.current.unbalanced && this.cache.length) {
+      this.current = this.cache.pop();
     }
   }
 
@@ -452,6 +452,9 @@ module.exports = class Parser {
           node.isHex = /^#/.test(value);
           node.isColor = /^#([0-9a-f]{3}|[0-9a-f]{6})$/i.test(value);
         }
+        else {
+          this.cache.push(this.current);
+        }
       }
 
       this.newNode(node);