JSX: Improved spread operator in tag attributes (#2159)

This allows any number of spaces around JSX attribute spread expressions.

components/prism-jsx.js

@@ -3,15 +3,15 @@
 var javascript = Prism.util.clone(Prism.languages.javascript);
 
 Prism.languages.jsx = Prism.languages.extend('markup', javascript);
-Prism.languages.jsx.tag.pattern= /<\/?(?:[\w.:-]+\s*(?:\s+(?:[\w.:$-]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s{'">=]+|\{(?:\{(?:\{[^}]*\}|[^{}])*\}|[^{}])+\}))?|\{\.{3}[a-z_$][\w$]*(?:\.[a-z_$][\w$]*)*\}))*\s*\/?)?>/i;
+Prism.languages.jsx.tag.pattern= /<\/?(?:[\w.:-]+\s*(?:\s+(?:[\w.:$-]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s{'">=]+|\{(?:\{(?:\{[^}]*\}|[^{}])*\}|[^{}])+\}))?|\{\s*\.{3}\s*[a-z_$][\w$]*(?:\.[a-z_$][\w$]*)*\s*\}))*\s*\/?)?>/i;
 
 Prism.languages.jsx.tag.inside['tag'].pattern = /^<\/?[^\s>\/]*/i;
 Prism.languages.jsx.tag.inside['attr-value'].pattern = /=(?!\{)(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">]+)/i;
 Prism.languages.jsx.tag.inside['tag'].inside['class-name'] = /^[A-Z]\w*(?:\.[A-Z]\w*)*$/;
 
 Prism.languages.insertBefore('inside', 'attr-name', {
 	'spread': {
-		pattern: /\{\.{3}[a-z_$][\w$]*(?:\.[a-z_$][\w$]*)*\}/,
+		pattern: /\{\s*\.{3}\s*[a-z_$][\w$]*(?:\.[a-z_$][\w$]*)*\s*\}/,
 		inside: {
 			'punctuation': /\.{3}|[{}.]/,
 			'attr-value': /\w+/

tests/languages/jsx/spread_in_tags.test

@@ -0,0 +1,72 @@
+<div {...foo}></div>
+<div { ...foo }></div>
+<div { ... foo }></div>
+
+----------------------------------------------------
+
+[
+	["tag", [
+		["tag", [
+			["punctuation", "<"],
+			"div"
+		]],
+		["spread", [
+			["punctuation", "{"],
+			["punctuation", "..."],
+			["attr-value", "foo"],
+			["punctuation", "}"]
+		]],
+		["punctuation", ">"]
+	]],
+	["tag", [
+		["tag", [
+			["punctuation", "</"],
+			"div"
+		]],
+		["punctuation", ">"]
+	]],
+	["tag", [
+		["tag", [
+			["punctuation", "<"],
+			"div"
+		]],
+		["spread", [
+			["punctuation", "{"],
+			["punctuation", "..."],
+			["attr-value", "foo"],
+			["punctuation", "}"]
+		]],
+		["punctuation", ">"]
+	]],
+	["tag", [
+		["tag", [
+			["punctuation", "</"],
+			"div"
+		]],
+		["punctuation", ">"]
+	]],
+	["tag", [
+		["tag", [
+			["punctuation", "<"],
+			"div"
+		]],
+		["spread", [
+			["punctuation", "{"],
+			["punctuation", "..."],
+			["attr-value", "foo"],
+			["punctuation", "}"]
+		]],
+		["punctuation", ">"]
+	]],
+	["tag", [
+		["tag", [
+			["punctuation", "</"],
+			"div"
+		]],
+		["punctuation", ">"]
+	]]
+]
+
+----------------------------------------------------
+
+Allow spaces in spread operator brackets in JSX tags.