Remove ERB dependency (#635)

ERB is bundled with Ruby already

lib/phlex.rb

@@ -9,6 +9,14 @@ module Phlex
 	#  rescue Phlex::Error
 	module Error; end
 
+	if defined?(ERB::Escape)
+		Escape = ERB::Escape
+	elsif defined?(ERB::Util)
+		Escape = ERB::Util
+	else
+		Escape = BasicEscape
+	end
+
 	# A specialised ArgumentError for Phlex.
 	class ArgumentError < ::ArgumentError
 		include Error

lib/phlex/basic_escape.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module Phlex
+	module BasicEscape
+		def html_escape(string)
+			string
+				.dup
+				.gsub!("&", "&")
+				.gsub!("<", "&lt;")
+				.gsub!(">", "&gt;")
+				.gsub!('"', "&quot;")
+				.gsub!("'", "&#39;")
+				.freeze
+		end
+	end
+end

lib/phlex/sgml.rb

@@ -339,14 +339,14 @@ def yield_content_with_args(*args)
 		def __text__(content)
 			case content
 			when String
-				@_context.target << ERB::Escape.html_escape(content)
+				@_context.target << Phlex::Escape.html_escape(content)
 			when Symbol
-				@_context.target << ERB::Escape.html_escape(content.name)
+				@_context.target << Phlex::Escape.html_escape(content.name)
 			when nil
 				nil
 			else
 				if (formatted_object = format_object(content))
-					@_context.target << ERB::Escape.html_escape(formatted_object)
+					@_context.target << Phlex::Escape.html_escape(formatted_object)
 				else
 					return false
 				end
@@ -402,9 +402,9 @@ def __build_attributes__(attributes, buffer:)
 				when true
 					buffer << " " << name
 				when String
-					buffer << " " << name << '="' << ERB::Escape.html_escape(v) << '"'
+					buffer << " " << name << '="' << Phlex::Escape.html_escape(v) << '"'
 				when Symbol
-					buffer << " " << name << '="' << ERB::Escape.html_escape(v.name) << '"'
+					buffer << " " << name << '="' << Phlex::Escape.html_escape(v.name) << '"'
 				when Integer, Float
 					buffer << " " << name << '="' << v.to_s << '"'
 				when Hash
@@ -417,11 +417,11 @@ def __build_attributes__(attributes, buffer:)
 						}, buffer: buffer
 					)
 				when Array
-					buffer << " " << name << '="' << ERB::Escape.html_escape(v.compact.join(" ")) << '"'
+					buffer << " " << name << '="' << Phlex::Escape.html_escape(v.compact.join(" ")) << '"'
 				when Set
-					buffer << " " << name << '="' << ERB::Escape.html_escape(v.to_a.compact.join(" ")) << '"'
+					buffer << " " << name << '="' << Phlex::Escape.html_escape(v.to_a.compact.join(" ")) << '"'
 				else
-					buffer << " " << name << '="' << ERB::Escape.html_escape(v.to_str) << '"'
+					buffer << " " << name << '="' << Phlex::Escape.html_escape(v.to_str) << '"'
 				end
 			end
 

phlex.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |spec|
 	end
 	spec.require_paths = ["lib"]
 
-	spec.add_dependency "erb", ">= 4"
 	spec.add_dependency "zeitwerk", "~> 2.6"
 
 	spec.metadata["rubygems_mfa_required"] = "true"