throw exception when encountering an unknown pragma

CHANGES.md

@@ -5,6 +5,8 @@
 * Better error message for missing partials.
 * Added more robust type detection.
 * Parse pragmas only once.
+* Throw exception when encountering an unknown pragma.
+
 
 ## 0.2.2 (11-02-2010)
 

examples/pragma.html

@@ -1 +0,0 @@
-{{%PRAGMA}}

examples/pragma.js

@@ -1,3 +0,0 @@
-var pragma = {
-  foo: 1
-};

examples/pragma.txt

@@ -1 +0,0 @@
-

examples/unknown_pragma.html

@@ -0,0 +1 @@
+{{%I-HAVE-THE-GREATEST-MUSTACHE}}

examples/unknown_pragma.js

@@ -0,0 +1 @@
+var unknown_pragma = {};

examples/unknown_pragma.txt

@@ -0,0 +1 @@
+ERROR: This implementation of mustache doesn't understand the 'I-HAVE-THE-GREATEST-MUSTACHE' pragma

mustache.js

@@ -18,6 +18,9 @@ var Mustache = function() {
     pragmas: {},
     buffer: [],
     pragmas_parsed: false,
+    pragmas_implemented: {
+      "IMPLICIT-ITERATOR": true
+    },
 
     render: function(template, context, partials, in_recursion) {
       // fail fast
@@ -68,6 +71,10 @@ var Mustache = function() {
       var regex = new RegExp(this.otag + "%([\\w_-]+) ?([\\w]+=[\\w]+)?"
         + this.ctag);
       return template.replace(regex, function(match, pragma, options) {
+        if(!that.pragmas_implemented[pragma]) {
+          throw({message: "This implementation of mustache doesn't understand the '"
+            + pragma + "' pragma"});
+        }
         that.pragmas[pragma] = {};
         if(options) {
           var opts = options.split("=");