CSP: Do not highlight directive names with adjacent hyphens (#2662)

CSP tokens used `\b` to assert word boundaries but this is incorrect as CSP tokens may contain hyphens (`-`). This replaces the assertions will lookarounds that address the issue.

Author: edukisto

Diff for: components/prism-csp.js

@@ -11,7 +11,8 @@
 
 Prism.languages.csp = {
 	'directive':  {
-		pattern: /\b(?:base-uri|block-all-mixed-content|(?:child|connect|default|font|frame|img|manifest|media|object|script|style|worker)-src|disown-opener|form-action|frame-ancestors|plugin-types|referrer|reflected-xss|report-to|report-uri|require-sri-for|sandbox|upgrade-insecure-requests)\b/i,
+		pattern: /(^|[^-\da-z])(?:base-uri|block-all-mixed-content|(?:child|connect|default|font|frame|img|manifest|media|object|script|style|worker)-src|disown-opener|form-action|frame-ancestors|plugin-types|referrer|reflected-xss|report-to|report-uri|require-sri-for|sandbox|upgrade-insecure-requests)(?=[^-\da-z]|$)/i,
+		lookbehind: true,
 		alias: 'keyword'
 	},
 	'safe': {

Diff for: components/prism-csp.min.js

@@ -0,0 +1,11 @@
+default-src-is-a-fake; fake-default-src;
+
+----------------------------------------------------
+
+[
+	"default-src-is-a-fake; fake-default-src;"
+]
+
+----------------------------------------------------
+
+Checks for directive names with adjacent hyphens.