update elements and fix some bugs

lib/src/prism/components/prism-crystal.js

Index: lib/src/prism/components/prism-crystal.js
diff --git a/lib/src/prism/components/prism-crystal.js b/lib/src/prism/components/prism-crystal.js
new file mode 100644
index 0000000000000000000000000000000000000000..66f24fb3024ab7f3cad9d54ac8d6ba0532da1fad
--- /dev/null
+++ b/lib/src/prism/components/prism-crystal.js
@@ -0,0 +1,53 @@
+(function(Prism) {
+	Prism.languages.crystal = Prism.languages.extend('ruby', {
+		keyword: [
+			/\b(?:abstract|alias|as|asm|begin|break|case|class|def|do|else|elsif|end|ensure|enum|extend|for|fun|if|ifdef|include|instance_sizeof|lib|macro|module|next|of|out|pointerof|private|protected|rescue|return|require|self|sizeof|struct|super|then|type|typeof|union|unless|until|when|while|with|yield|__DIR__|__FILE__|__LINE__)\b/,
+			{
+				pattern: /(\.\s*)(?:is_a|responds_to)\?/,
+				lookbehind: true
+			}
+		],
+
+		number: /\b(?:0b[01_]*[01]|0o[0-7_]*[0-7]|0x[0-9a-fA-F_]*[0-9a-fA-F]|(?:[0-9](?:[0-9_]*[0-9])?)(?:\.[0-9_]*[0-9])?(?:[eE][+-]?[0-9_]*[0-9])?)(?:_(?:[uif](?:8|16|32|64))?)?\b/,
+	});
+
+	var rest = Prism.util.clone(Prism.languages.crystal);
+
+	Prism.languages.insertBefore('crystal', 'string', {
+		attribute: {
+			pattern: /@\[.+?\]/,
+			alias: 'attr-name',
+			inside: {
+				delimiter: {
+					pattern: /^@\[|\]$/,
+					alias: 'tag'
+				},
+				rest: rest
+			}
+		},
+
+		expansion: [
+		{
+			pattern: /\{\{.+?\}\}/,
+			inside: {
+				delimiter: {
+					pattern: /^\{\{|\}\}$/,
+					alias: 'tag'
+				},
+				rest: rest
+			}
+		},
+		{
+			pattern: /\{%.+?%\}/,
+			inside: {
+				delimiter: {
+					pattern: /^\{%|%\}$/,
+					alias: 'tag'
+				},
+				rest: rest
+			}
+		}
+		]
+	});
+
+}(Prism));