kmx.io/prism.js

diff --git a/components/prism-core.js b/components/prism-core.js
index d69fd99..1259f23 100644
--- a/components/prism-core.js
+++ b/components/prism-core.js
@@ -659,6 +659,9 @@ var Prism = (function (_self) {
 				language: language
 			};
 			_.hooks.run('before-tokenize', env);
+			if (!env.grammar) {
+				throw new Error('The language "' + env.language + '" has no grammar.');
+			}
 			env.tokens = _.tokenize(env.code, env.grammar);
 			_.hooks.run('after-tokenize', env);
 			return Token.stringify(_.util.encode(env.tokens), env.language);
diff --git a/components/prism-core.min.js b/components/prism-core.min.js
index 6aa6722..eedbcf6 100644
--- a/components/prism-core.min.js
+++ b/components/prism-core.min.js
@@ -1 +1 @@
-var _self="undefined"!=typeof window?window:"undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?self:{},Prism=function(u){var t=/(?:^|\s)lang(?:uage)?-([\w-]+)(?=\s|$)/i,n=0,e={},M={manual:u.Prism&&u.Prism.manual,disableWorkerMessageHandler:u.Prism&&u.Prism.disableWorkerMessageHandler,util:{encode:function e(n){return n instanceof W?new W(n.type,e(n.content),n.alias):Array.isArray(n)?n.map(e):n.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/\u00a0/g," ")},type:function(e){return Object.prototype.toString.call(e).slice(8,-1)},objId:function(e){return e.__id||Object.defineProperty(e,"__id",{value:++n}),e.__id},clone:function t(e,r){var a,n;switch(r=r||{},M.util.type(e)){case"Object":if(n=M.util.objId(e),r[n])return r[n];for(var i in a={},r[n]=a,e)e.hasOwnProperty(i)&&(a[i]=t(e[i],r));return a;case"Array":return n=M.util.objId(e),r[n]?r[n]:(a=[],r[n]=a,e.forEach(function(e,n){a[n]=t(e,r)}),a);default:return e}},getLanguage:function(e){for(;e;){var n=t.exec(e.className);if(n)return n[1].toLowerCase();e=e.parentElement}return"none"},setLanguage:function(e,n){e.className=e.className.replace(RegExp(t,"gi"),""),e.classList.add("language-"+n)},currentScript:function(){if("undefined"==typeof document)return null;if("currentScript"in document)return document.currentScript;try{throw new Error}catch(e){var n=(/at [^(\r\n]*\((.*):[^:]+:[^:]+\)$/i.exec(e.stack)||[])[1];if(n){var t=document.getElementsByTagName("script");for(var r in t)if(t[r].src==n)return t[r]}return null}},isActive:function(e,n,t){for(var r="no-"+n;e;){var a=e.classList;if(a.contains(n))return!0;if(a.contains(r))return!1;e=e.parentElement}return!!t}},languages:{plain:e,plaintext:e,text:e,txt:e,extend:function(e,n){var t=M.util.clone(M.languages[e]);for(var r in n)t[r]=n[r];return t},insertBefore:function(t,e,n,r){var a=(r=r||M.languages)[t],i={};for(var l in a)if(a.hasOwnProperty(l)){if(l==e)for(var o in n)n.hasOwnProperty(o)&&(i[o]=n[o]);n.hasOwnProperty(l)||(i[l]=a[l])}var s=r[t];return r[t]=i,M.languages.DFS(M.languages,function(e,n){n===s&&e!=t&&(this[e]=i)}),i},DFS:function e(n,t,r,a){a=a||{};var i=M.util.objId;for(var l in n)if(n.hasOwnProperty(l)){t.call(n,l,n[l],r||l);var o=n[l],s=M.util.type(o);"Object"!==s||a[i(o)]?"Array"!==s||a[i(o)]||(a[i(o)]=!0,e(o,t,l,a)):(a[i(o)]=!0,e(o,t,null,a))}}},plugins:{},highlightAll:function(e,n){M.highlightAllUnder(document,e,n)},highlightAllUnder:function(e,n,t){var r={callback:t,container:e,selector:'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'};M.hooks.run("before-highlightall",r),r.elements=Array.prototype.slice.apply(r.container.querySelectorAll(r.selector)),M.hooks.run("before-all-elements-highlight",r);for(var a,i=0;a=r.elements[i++];)M.highlightElement(a,!0===n,r.callback)},highlightElement:function(e,n,t){var r=M.util.getLanguage(e),a=M.languages[r];M.util.setLanguage(e,r);var i=e.parentElement;i&&"pre"===i.nodeName.toLowerCase()&&M.util.setLanguage(i,r);var l={element:e,language:r,grammar:a,code:e.textContent};function o(e){l.highlightedCode=e,M.hooks.run("before-insert",l),l.element.innerHTML=l.highlightedCode,M.hooks.run("after-highlight",l),M.hooks.run("complete",l),t&&t.call(l.element)}if(M.hooks.run("before-sanity-check",l),(i=l.element.parentElement)&&"pre"===i.nodeName.toLowerCase()&&!i.hasAttribute("tabindex")&&i.setAttribute("tabindex","0"),!l.code)return M.hooks.run("complete",l),void(t&&t.call(l.element));if(M.hooks.run("before-highlight",l),l.grammar)if(n&&u.Worker){var s=new Worker(M.filename);s.onmessage=function(e){o(e.data)},s.postMessage(JSON.stringify({language:l.language,code:l.code,immediateClose:!0}))}else o(M.highlight(l.code,l.grammar,l.language));else o(M.util.encode(l.code))},highlight:function(e,n,t){var r={code:e,grammar:n,language:t};return M.hooks.run("before-tokenize",r),r.tokens=M.tokenize(r.code,r.grammar),M.hooks.run("after-tokenize",r),W.stringify(M.util.encode(r.tokens),r.language)},tokenize:function(e,n){var t=n.rest;if(t){for(var r in t)n[r]=t[r];delete n.rest}var a=new i;return I(a,a.head,e),function e(n,t,r,a,i,l){for(var o in r)if(r.hasOwnProperty(o)&&r[o]){var s=r[o];s=Array.isArray(s)?s:[s];for(var u=0;u<s.length;++u){if(l&&l.cause==o+","+u)return;var c=s[u],g=c.inside,f=!!c.lookbehind,h=!!c.greedy,d=c.alias;if(h&&!c.pattern.global){var v=c.pattern.toString().match(/[imsuy]*$/)[0];c.pattern=RegExp(c.pattern.source,v+"g")}for(var p=c.pattern||c,m=a.next,y=i;m!==t.tail&&!(l&&y>=l.reach);y+=m.value.length,m=m.next){var k=m.value;if(t.length>n.length)return;if(!(k instanceof W)){var x,b=1;if(h){if(!(x=z(p,y,n,f))||x.index>=n.length)break;var w=x.index,A=x.index+x[0].length,P=y;for(P+=m.value.length;P<=w;)m=m.next,P+=m.value.length;if(P-=m.value.length,y=P,m.value instanceof W)continue;for(var E=m;E!==t.tail&&(P<A||"string"==typeof E.value);E=E.next)b++,P+=E.value.length;b--,k=n.slice(y,P),x.index-=y}else if(!(x=z(p,0,k,f)))continue;var w=x.index,L=x[0],S=k.slice(0,w),O=k.slice(w+L.length),j=y+k.length;l&&j>l.reach&&(l.reach=j);var C=m.prev;S&&(C=I(t,C,S),y+=S.length),q(t,C,b);var N=new W(o,g?M.tokenize(L,g):L,d,L);if(m=I(t,C,N),O&&I(t,m,O),1<b){var _={cause:o+","+u,reach:j};e(n,t,r,m.prev,y,_),l&&_.reach>l.reach&&(l.reach=_.reach)}}}}}}(e,a,n,a.head,0),function(e){var n=[],t=e.head.next;for(;t!==e.tail;)n.push(t.value),t=t.next;return n}(a)},hooks:{all:{},add:function(e,n){var t=M.hooks.all;t[e]=t[e]||[],t[e].push(n)},run:function(e,n){var t=M.hooks.all[e];if(t&&t.length)for(var r,a=0;r=t[a++];)r(n)}},Token:W};function W(e,n,t,r){this.type=e,this.content=n,this.alias=t,this.length=0|(r||"").length}function z(e,n,t,r){e.lastIndex=n;var a=e.exec(t);if(a&&r&&a[1]){var i=a[1].length;a.index+=i,a[0]=a[0].slice(i)}return a}function i(){var e={value:null,prev:null,next:null},n={value:null,prev:e,next:null};e.next=n,this.head=e,this.tail=n,this.length=0}function I(e,n,t){var r=n.next,a={value:t,prev:n,next:r};return n.next=a,r.prev=a,e.length++,a}function q(e,n,t){for(var r=n.next,a=0;a<t&&r!==e.tail;a++)r=r.next;(n.next=r).prev=n,e.length-=a}if(u.Prism=M,W.stringify=function n(e,t){if("string"==typeof e)return e;if(Array.isArray(e)){var r="";return e.forEach(function(e){r+=n(e,t)}),r}var a={type:e.type,content:n(e.content,t),tag:"span",classes:["token",e.type],attributes:{},language:t},i=e.alias;i&&(Array.isArray(i)?Array.prototype.push.apply(a.classes,i):a.classes.push(i)),M.hooks.run("wrap",a);var l="";for(var o in a.attributes)l+=" "+o+'="'+(a.attributes[o]||"").replace(/"/g,"&quot;")+'"';return"<"+a.tag+' class="'+a.classes.join(" ")+'"'+l+">"+a.content+"</"+a.tag+">"},!u.document)return u.addEventListener&&(M.disableWorkerMessageHandler||u.addEventListener("message",function(e){var n=JSON.parse(e.data),t=n.language,r=n.code,a=n.immediateClose;u.postMessage(M.highlight(r,M.languages[t],t)),a&&u.close()},!1)),M;var r=M.util.currentScript();function a(){M.manual||M.highlightAll()}if(r&&(M.filename=r.src,r.hasAttribute("data-manual")&&(M.manual=!0)),!M.manual){var l=document.readyState;"loading"===l||"interactive"===l&&r&&r.defer?document.addEventListener("DOMContentLoaded",a):window.requestAnimationFrame?window.requestAnimationFrame(a):window.setTimeout(a,16)}return M}(_self);"undefined"!=typeof module&&module.exports&&(module.exports=Prism),"undefined"!=typeof global&&(global.Prism=Prism);
\ No newline at end of file
+var _self="undefined"!=typeof window?window:"undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?self:{},Prism=function(u){var t=/(?:^|\s)lang(?:uage)?-([\w-]+)(?=\s|$)/i,n=0,e={},M={manual:u.Prism&&u.Prism.manual,disableWorkerMessageHandler:u.Prism&&u.Prism.disableWorkerMessageHandler,util:{encode:function e(n){return n instanceof W?new W(n.type,e(n.content),n.alias):Array.isArray(n)?n.map(e):n.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/\u00a0/g," ")},type:function(e){return Object.prototype.toString.call(e).slice(8,-1)},objId:function(e){return e.__id||Object.defineProperty(e,"__id",{value:++n}),e.__id},clone:function t(e,r){var a,n;switch(r=r||{},M.util.type(e)){case"Object":if(n=M.util.objId(e),r[n])return r[n];for(var i in a={},r[n]=a,e)e.hasOwnProperty(i)&&(a[i]=t(e[i],r));return a;case"Array":return n=M.util.objId(e),r[n]?r[n]:(a=[],r[n]=a,e.forEach(function(e,n){a[n]=t(e,r)}),a);default:return e}},getLanguage:function(e){for(;e;){var n=t.exec(e.className);if(n)return n[1].toLowerCase();e=e.parentElement}return"none"},setLanguage:function(e,n){e.className=e.className.replace(RegExp(t,"gi"),""),e.classList.add("language-"+n)},currentScript:function(){if("undefined"==typeof document)return null;if("currentScript"in document)return document.currentScript;try{throw new Error}catch(e){var n=(/at [^(\r\n]*\((.*):[^:]+:[^:]+\)$/i.exec(e.stack)||[])[1];if(n){var t=document.getElementsByTagName("script");for(var r in t)if(t[r].src==n)return t[r]}return null}},isActive:function(e,n,t){for(var r="no-"+n;e;){var a=e.classList;if(a.contains(n))return!0;if(a.contains(r))return!1;e=e.parentElement}return!!t}},languages:{plain:e,plaintext:e,text:e,txt:e,extend:function(e,n){var t=M.util.clone(M.languages[e]);for(var r in n)t[r]=n[r];return t},insertBefore:function(t,e,n,r){var a=(r=r||M.languages)[t],i={};for(var l in a)if(a.hasOwnProperty(l)){if(l==e)for(var o in n)n.hasOwnProperty(o)&&(i[o]=n[o]);n.hasOwnProperty(l)||(i[l]=a[l])}var s=r[t];return r[t]=i,M.languages.DFS(M.languages,function(e,n){n===s&&e!=t&&(this[e]=i)}),i},DFS:function e(n,t,r,a){a=a||{};var i=M.util.objId;for(var l in n)if(n.hasOwnProperty(l)){t.call(n,l,n[l],r||l);var o=n[l],s=M.util.type(o);"Object"!==s||a[i(o)]?"Array"!==s||a[i(o)]||(a[i(o)]=!0,e(o,t,l,a)):(a[i(o)]=!0,e(o,t,null,a))}}},plugins:{},highlightAll:function(e,n){M.highlightAllUnder(document,e,n)},highlightAllUnder:function(e,n,t){var r={callback:t,container:e,selector:'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'};M.hooks.run("before-highlightall",r),r.elements=Array.prototype.slice.apply(r.container.querySelectorAll(r.selector)),M.hooks.run("before-all-elements-highlight",r);for(var a,i=0;a=r.elements[i++];)M.highlightElement(a,!0===n,r.callback)},highlightElement:function(e,n,t){var r=M.util.getLanguage(e),a=M.languages[r];M.util.setLanguage(e,r);var i=e.parentElement;i&&"pre"===i.nodeName.toLowerCase()&&M.util.setLanguage(i,r);var l={element:e,language:r,grammar:a,code:e.textContent};function o(e){l.highlightedCode=e,M.hooks.run("before-insert",l),l.element.innerHTML=l.highlightedCode,M.hooks.run("after-highlight",l),M.hooks.run("complete",l),t&&t.call(l.element)}if(M.hooks.run("before-sanity-check",l),(i=l.element.parentElement)&&"pre"===i.nodeName.toLowerCase()&&!i.hasAttribute("tabindex")&&i.setAttribute("tabindex","0"),!l.code)return M.hooks.run("complete",l),void(t&&t.call(l.element));if(M.hooks.run("before-highlight",l),l.grammar)if(n&&u.Worker){var s=new Worker(M.filename);s.onmessage=function(e){o(e.data)},s.postMessage(JSON.stringify({language:l.language,code:l.code,immediateClose:!0}))}else o(M.highlight(l.code,l.grammar,l.language));else o(M.util.encode(l.code))},highlight:function(e,n,t){var r={code:e,grammar:n,language:t};if(M.hooks.run("before-tokenize",r),!r.grammar)throw new Error('The language "'+r.language+'" has no grammar.');return r.tokens=M.tokenize(r.code,r.grammar),M.hooks.run("after-tokenize",r),W.stringify(M.util.encode(r.tokens),r.language)},tokenize:function(e,n){var t=n.rest;if(t){for(var r in t)n[r]=t[r];delete n.rest}var a=new i;return I(a,a.head,e),function e(n,t,r,a,i,l){for(var o in r)if(r.hasOwnProperty(o)&&r[o]){var s=r[o];s=Array.isArray(s)?s:[s];for(var u=0;u<s.length;++u){if(l&&l.cause==o+","+u)return;var c=s[u],g=c.inside,f=!!c.lookbehind,h=!!c.greedy,d=c.alias;if(h&&!c.pattern.global){var v=c.pattern.toString().match(/[imsuy]*$/)[0];c.pattern=RegExp(c.pattern.source,v+"g")}for(var p=c.pattern||c,m=a.next,y=i;m!==t.tail&&!(l&&y>=l.reach);y+=m.value.length,m=m.next){var k=m.value;if(t.length>n.length)return;if(!(k instanceof W)){var x,b=1;if(h){if(!(x=z(p,y,n,f))||x.index>=n.length)break;var w=x.index,A=x.index+x[0].length,E=y;for(E+=m.value.length;E<=w;)m=m.next,E+=m.value.length;if(E-=m.value.length,y=E,m.value instanceof W)continue;for(var P=m;P!==t.tail&&(E<A||"string"==typeof P.value);P=P.next)b++,E+=P.value.length;b--,k=n.slice(y,E),x.index-=y}else if(!(x=z(p,0,k,f)))continue;var w=x.index,L=x[0],S=k.slice(0,w),O=k.slice(w+L.length),j=y+k.length;l&&j>l.reach&&(l.reach=j);var C=m.prev;S&&(C=I(t,C,S),y+=S.length),T(t,C,b);var N=new W(o,g?M.tokenize(L,g):L,d,L);if(m=I(t,C,N),O&&I(t,m,O),1<b){var _={cause:o+","+u,reach:j};e(n,t,r,m.prev,y,_),l&&_.reach>l.reach&&(l.reach=_.reach)}}}}}}(e,a,n,a.head,0),function(e){var n=[],t=e.head.next;for(;t!==e.tail;)n.push(t.value),t=t.next;return n}(a)},hooks:{all:{},add:function(e,n){var t=M.hooks.all;t[e]=t[e]||[],t[e].push(n)},run:function(e,n){var t=M.hooks.all[e];if(t&&t.length)for(var r,a=0;r=t[a++];)r(n)}},Token:W};function W(e,n,t,r){this.type=e,this.content=n,this.alias=t,this.length=0|(r||"").length}function z(e,n,t,r){e.lastIndex=n;var a=e.exec(t);if(a&&r&&a[1]){var i=a[1].length;a.index+=i,a[0]=a[0].slice(i)}return a}function i(){var e={value:null,prev:null,next:null},n={value:null,prev:e,next:null};e.next=n,this.head=e,this.tail=n,this.length=0}function I(e,n,t){var r=n.next,a={value:t,prev:n,next:r};return n.next=a,r.prev=a,e.length++,a}function T(e,n,t){for(var r=n.next,a=0;a<t&&r!==e.tail;a++)r=r.next;(n.next=r).prev=n,e.length-=a}if(u.Prism=M,W.stringify=function n(e,t){if("string"==typeof e)return e;if(Array.isArray(e)){var r="";return e.forEach(function(e){r+=n(e,t)}),r}var a={type:e.type,content:n(e.content,t),tag:"span",classes:["token",e.type],attributes:{},language:t},i=e.alias;i&&(Array.isArray(i)?Array.prototype.push.apply(a.classes,i):a.classes.push(i)),M.hooks.run("wrap",a);var l="";for(var o in a.attributes)l+=" "+o+'="'+(a.attributes[o]||"").replace(/"/g,"&quot;")+'"';return"<"+a.tag+' class="'+a.classes.join(" ")+'"'+l+">"+a.content+"</"+a.tag+">"},!u.document)return u.addEventListener&&(M.disableWorkerMessageHandler||u.addEventListener("message",function(e){var n=JSON.parse(e.data),t=n.language,r=n.code,a=n.immediateClose;u.postMessage(M.highlight(r,M.languages[t],t)),a&&u.close()},!1)),M;var r=M.util.currentScript();function a(){M.manual||M.highlightAll()}if(r&&(M.filename=r.src,r.hasAttribute("data-manual")&&(M.manual=!0)),!M.manual){var l=document.readyState;"loading"===l||"interactive"===l&&r&&r.defer?document.addEventListener("DOMContentLoaded",a):window.requestAnimationFrame?window.requestAnimationFrame(a):window.setTimeout(a,16)}return M}(_self);"undefined"!=typeof module&&module.exports&&(module.exports=Prism),"undefined"!=typeof global&&(global.Prism=Prism);
\ No newline at end of file
diff --git a/docs/Prism.hooks.html b/docs/Prism.hooks.html
index 8b88b4a..0bc18a0 100644
--- a/docs/Prism.hooks.html
+++ b/docs/Prism.hooks.html
@@ -73,7 +73,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line714">line 714</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line717">line 717</a>
     </li></ul></dd>
     
 
@@ -152,7 +152,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line729">line 729</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line732">line 732</a>
     </li></ul></dd>
     
 
@@ -314,7 +314,7 @@ Hooks are usually directly run by a highlight function but you can also run hook
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line746">line 746</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line749">line 749</a>
     </li></ul></dd>
     
 
diff --git a/docs/Prism.html b/docs/Prism.html
index e27a9e1..73efd74 100644
--- a/docs/Prism.html
+++ b/docs/Prism.html
@@ -1244,7 +1244,7 @@ Mostly useful when <code>async</code> is <code>true</code>, since in that case, 
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line691">line 691</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line694">line 694</a>
     </li></ul></dd>
     
 
diff --git a/docs/Token.html b/docs/Token.html
index fceef02..f35d4b3 100644
--- a/docs/Token.html
+++ b/docs/Token.html
@@ -80,7 +80,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line780">line 780</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line783">line 783</a>
     </li></ul></dd>
     
 
@@ -364,7 +364,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line807">line 807</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line810">line 810</a>
     </li></ul></dd>
     
 
@@ -447,7 +447,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line799">line 799</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line802">line 802</a>
     </li></ul></dd>
     
 
@@ -524,7 +524,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line790">line 790</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line793">line 793</a>
     </li></ul></dd>
     
 
diff --git a/docs/global.html b/docs/global.html
index e4a62cd..69c177f 100644
--- a/docs/global.html
+++ b/docs/global.html
@@ -143,7 +143,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1236">line 1236</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1239">line 1239</a>
     </li></ul></dd>
     
 
@@ -274,7 +274,7 @@
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1215">line 1215</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1218">line 1218</a>
     </li></ul></dd>
     
 
@@ -559,7 +559,7 @@ each another.</p></td>
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1244">line 1244</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1247">line 1247</a>
     </li></ul></dd>
     
 
@@ -713,7 +713,7 @@ each another.</p></td>
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1254">line 1254</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line1257">line 1257</a>
     </li></ul></dd>
     
 
@@ -859,7 +859,7 @@ each another.</p></td>
     
     <dt class="tag-source">Source:</dt>
     <dd class="tag-source"><ul class="dummy"><li>
-        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line812">line 812</a>
+        <a href="prism-core.js.html">prism-core.js</a>, <a href="prism-core.js.html#line815">line 815</a>
     </li></ul></dd>
     
 
diff --git a/docs/prism-core.js.html b/docs/prism-core.js.html
index c1e9c99..c895242 100644
--- a/docs/prism-core.js.html
+++ b/docs/prism-core.js.html
@@ -712,6 +712,9 @@ var Prism = (function (_self) {
 				language: language
 			};
 			_.hooks.run('before-tokenize', env);
+			if (!env.grammar) {
+				throw new Error('The language "' + env.language + '" has no grammar.');
+			}
 			env.tokens = _.tokenize(env.code, env.grammar);
 			_.hooks.run('after-tokenize', env);
 			return Token.stringify(_.util.encode(env.tokens), env.language);
diff --git a/prism.js b/prism.js
index 7d2bc60..04e9a28 100644
--- a/prism.js
+++ b/prism.js
@@ -664,6 +664,9 @@ var Prism = (function (_self) {
 				language: language
 			};
 			_.hooks.run('before-tokenize', env);
+			if (!env.grammar) {
+				throw new Error('The language "' + env.language + '" has no grammar.');
+			}
 			env.tokens = _.tokenize(env.code, env.grammar);
 			_.hooks.run('after-tokenize', env);
 			return Token.stringify(_.util.encode(env.tokens), env.language);