Allow binding to via the kwarg in tokens

Author: bradgessler

lib/phlex/helpers.rb

@@ -18,7 +18,7 @@ module Phlex::Helpers
 	# 	tokens(
 	# 		active?: { then: "active", else: "inactive" }
 	# 	)
-	def tokens(*tokens, **conditional_tokens)
+	def tokens(*tokens, class: nil, **conditional_tokens)
 		conditional_tokens.each do |condition, token|
 			truthy = case condition
 				when Symbol then send(condition)
@@ -38,6 +38,13 @@ def tokens(*tokens, **conditional_tokens)
 			end
 		end
 
+		case binding.local_variable_get(:class)
+		when Class
+			raise ArgumentError, "Implicit class binding is not supported. Use the class: keyword argument."
+		else
+			tokens.append binding.local_variable_get(:class)
+		end
+
 		tokens = tokens.select(&:itself).join(" ")
 		tokens.strip!
 		tokens.gsub!(/\s+/, " ")

test/phlex/view/tokens.rb

@@ -3,6 +3,41 @@
 describe Phlex::HTML do
 	extend ViewHelper
 
+	with "implicit class binding" do
+		with "class: keyword argument" do
+			view do
+				def view_template
+					red(class: "buzz")
+				end
+
+				def red(class:)
+					div(class: tokens("fizz", class:))
+				end
+			end
+
+			it "implicitly binds class: keyword argument" do
+				expect(output).to be == %(<div class="fizz buzz"></div>)
+			end
+		end
+
+		with "endless argumens (...)" do
+			view do
+				def view_template
+					red(class: "buzz")
+				end
+
+				def red(...)
+					div(class: tokens("fizz", class:))
+				end
+			end
+
+			it "raises error" do
+				expect{ output }.to raise_exception ArgumentError,
+					message: be == "Implicit class binding is not supported. Use the class: keyword argument."
+			end
+		end
+	end
+
 	with "conditional classes" do
 		with "symbol conditionals" do
 			view do