Highlight Ruby method definitions without arguments

components/prism-ruby.js

@@ -13,7 +13,7 @@
 				greedy: true
 			}
 		],
-		'keyword': /\b(?:alias|and|BEGIN|begin|break|case|class|def|define_method|defined|do|each|else|elsif|END|end|ensure|false|for|if|in|module|new|next|nil|not|or|protected|private|public|raise|redo|require|rescue|retry|return|self|super|then|throw|true|undef|unless|until|when|while|yield)\b/
+		'keyword': /\b(?:alias|and|BEGIN|begin|break|case|class|def|define_method|defined|do|each|else|elsif|END|end|ensure|false|for|if|in|module|new|next|nil|not|or|protected|private|public|raise|redo|require|rescue|retry|return|self|super|then|throw|true|undef|unless|until|when|while|yield)\b/,
 	});
 
 	var interpolation = {
@@ -27,6 +27,8 @@
 		}
 	};
 
+	delete Prism.languages.ruby.function;
+
 	Prism.languages.insertBefore('ruby', 'keyword', {
 		'regex': [
 			{
@@ -75,6 +77,10 @@
 		'symbol': {
 			pattern: /(^|[^:]):[a-zA-Z_]\w*(?:[?!]|\b)/,
 			lookbehind: true
+		},
+		'function': {
+			pattern: /(def )[\w.]+/,
+			lookbehind: true,
 		}
 	});
 
@@ -128,4 +134,4 @@
 			}
 		}
 	];
-}(Prism));
+}(Prism));

tests/languages/crystal/attribute_feature.test

@@ -11,7 +11,7 @@
 	]],
 	["attribute", [
 		["delimiter", "@["],
-		["function", "CallConvention"], ["punctuation", "("], ["string", [ "\"X86_StdCall\"" ]], ["punctuation", ")"],
+		["constant", "CallConvention"], ["punctuation", "("], ["string", [ "\"X86_StdCall\"" ]], ["punctuation", ")"],
 		["delimiter", "]"]
 	]]
 ]

tests/languages/crystal/keyword_feature.test

@@ -1,6 +1,7 @@
 abstract alias as asm begin break case
 class;
-def do else elsif
+def
+do else elsif
 end ensure enum extend for fun
 if include instance_sizeof
 .is_a?

tests/languages/erb/erb_in_markup_feature.test

@@ -19,7 +19,7 @@ ___ERB1___<%= 1 %>___ERB2___<%= 2 %>
 				["punctuation", "."],
 				"now",
 				["punctuation", "."],
-				["function", "strftime"],
+				"strftime",
 				["punctuation", "("],
 				["string", ["'%A'"]],
 				["punctuation", ")"],
@@ -45,4 +45,4 @@ ___ERB1___<%= 1 %>___ERB2___<%= 2 %>
 
 ----------------------------------------------------
 
-Checks for ERB inside Markup
+Checks for ERB inside Markup

tests/languages/haml/tag_feature.test

@@ -105,7 +105,7 @@
 		"%html",
 		["attributes", [
 			["punctuation", "{"],
-			["function", "html_attrs"],
+			"html_attrs",
 			["punctuation", "("],
 			["string", ["'fr-fr'"]],
 			["punctuation", ")"],
@@ -158,4 +158,4 @@
 
 Checks for tags: basic element names, attributes, html-style attributes,
 attribute methods, boolean attributes, class and id shortcuts,
-implicit div elements, empty tags and whitespace removal.
+implicit div elements, empty tags and whitespace removal.

tests/languages/ruby/method_definition_feature.test

@@ -0,0 +1,72 @@
+class Circle
+  def self.of_diameter(diameter)
+    new diameter / 2
+  end
+
+  def initialize(radius)
+    @radius = radius
+  end
+
+  def circumference
+    Math::PI * radius ** 2
+  end
+
+  # Seattle style
+  def grow_by factor:
+    @radius = @radius * factor
+  end
+end
+
+----------------------------------------------------
+
+[
+  ["keyword", "class"],
+  ["class-name", ["Circle"]],
+  ["keyword", "def"],
+  ["function", "self.of_diameter"],
+  ["punctuation", "("],
+  "diameter",
+  ["punctuation", ")"],
+  ["keyword", "new"],
+  ["class-name", ["diameter"]],
+  ["operator", "/"],
+  ["number", "2"],
+  ["keyword", "end"],
+  ["keyword", "def"],
+  ["function", "initialize"],
+  ["punctuation", "("],
+  "radius",
+  ["punctuation", ")"],
+  ["variable", "@radius"],
+  ["operator", "="],
+  " radius\n  ",
+  ["keyword", "end"],
+  ["keyword", "def"],
+  ["function", "circumference"],
+  ["constant", "Math"],
+  ["punctuation", ":"],
+  ["punctuation", ":"],
+  ["constant", "PI"],
+  ["operator", "*"],
+  " radius ",
+  ["operator", "*"],
+  ["operator", "*"],
+  ["number", "2"],
+  ["keyword", "end"],
+  ["comment", "# Seattle style"],
+  ["keyword", "def"],
+  ["function", "grow_by"],
+  " factor",
+  ["punctuation", ":"],
+  ["variable", "@radius"],
+  ["operator", "="],
+  ["variable", "@radius"],
+  ["operator", "*"],
+  " factor\n  ",
+  ["keyword", "end"],
+  ["keyword", "end"]
+]
+
+----------------------------------------------------
+
+Checks that method definitions are highlighted correctly