Start testing with css-parsing-tests

Author: kddnewton

.gitignore

@@ -1 +1,2 @@
+coverage
 test.css

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "css-parsing-tests"]
-	path = css-parsing-tests
+	path = test/css-parsing-tests
 	url = https://github.com/SimonSapin/css-parsing-tests.git

Gemfile

@@ -2,5 +2,4 @@
 
 source "https://rubygems.org"
 
-gem "prettier_print"
-gem "syntax_tree"
+gemspec

Gemfile.lock

@@ -1,16 +1,35 @@
+PATH
+  remote: .
+  specs:
+    syntax_tree-css (0.1.0)
+      prettier_print
+      syntax_tree (>= 2.0.1)
+
 GEM
   remote: https://rubygems.org/
   specs:
+    docile (1.4.0)
+    minitest (5.15.0)
     prettier_print (0.1.0)
+    rake (13.0.6)
+    simplecov (0.21.2)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
     syntax_tree (2.7.1)
       prettier_print
 
 PLATFORMS
   x86_64-darwin-21
 
 DEPENDENCIES
-  prettier_print
-  syntax_tree
+  bundler
+  minitest
+  rake
+  simplecov
+  syntax_tree-css!
 
 BUNDLED WITH
    2.4.0.dev

Rakefile

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require "bundler/gem_tasks"
+require "rake/testtask"
+require "syntax_tree/rake_tasks"
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.libs << "lib"
+  t.test_files = FileList["test/**/*_test.rb"]
+end
+
+SyntaxTree::Rake::CheckTask.new
+SyntaxTree::Rake::WriteTask.new
+
+task default: :test

lib/syntax_tree/css.rb

@@ -6,8 +6,10 @@
 require_relative "css/nodes"
 require_relative "css/parser"
 require_relative "css/selectors"
-require_relative "css/visitor"
 
+require_relative "css/basic_visitor"
+require_relative "css/format"
+require_relative "css/visitor"
 require_relative "css/pretty_print"
 
 module SyntaxTree

lib/syntax_tree/css/basic_visitor.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module SyntaxTree
+  module CSS
+    # The parent class of all visitors that provides the double dispatch
+    # pattern. It doesn't provide any of the aliases so it can't actually be
+    # used to visit the tree. It's used to implement visitors that should raise
+    # an error if a node that's not implemented is visited.
+    class BasicVisitor
+      def visit(node)
+        node&.accept(self)
+      end
+
+      def visit_all(nodes)
+        nodes.map { |node| visit(node) }
+      end
+
+      def visit_child_nodes(node)
+        visit_all(node.child_nodes)
+      end
+    end
+  end
+end

lib/syntax_tree/css/format.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module SyntaxTree
+  module CSS
+    # A formatting visitor.
+    class Format < BasicVisitor
+      attr_reader :q
+
+      def initialize(q)
+        @q = q
+      end
+    end
+  end
+end