implment comment rule

lib/rupkl/parser/misc.rb

@@ -5,20 +5,36 @@ class Parser
     WS_PATTERN = '[ \t\f\r\n;]'
 
     define_parser do
+      rule(:line_comment) do
+        str('//') >> match('[^\n]').repeat >> (nl | eof)
+      end
+
+      rule(:block_comment) do
+        str('/*') >> (block_comment | (str('*/').absent? >> any)).repeat >> str('*/')
+      end
+
+      rule(:comment) do
+        line_comment | block_comment
+      end
+
       rule(:nl) do
         match('\n')
       end
 
+      rule(:eof) do
+        any.absent?
+      end
+
       rule(:ws) do
-        match(WS_PATTERN).repeat(1).ignore
+        (match(WS_PATTERN) | comment).repeat(1).ignore
       end
 
       rule(:ws?) do
-        match(WS_PATTERN).repeat.ignore
+        (match(WS_PATTERN) | comment).repeat.ignore
       end
 
       rule(:pure_ws?) do
-        match('[ \t\f]').repeat.ignore
+        (match('[ \t\f]') | comment).repeat.ignore
       end
 
       private

spec/rupkl/parser/comment_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+RSpec.describe RuPkl::Parser do
+  let(:parser) do
+    RuPkl::Parser.new
+  end
+
+  describe 'comment' do
+    it 'should be ignored' do
+      pkl = <<~'PKL'.chomp
+        x = 10 // end-of-line comment
+
+        y = 20 /*
+        multi
+        line
+        /* nested */
+        comment
+        */ z = 30
+
+        /// documentation comment
+        a = 40
+
+        b = 50 // single-line comment running until EOF rather than newline
+      PKL
+
+      expect(parser)
+        .to parse_string(pkl, :pkl_module)
+        .as(pkl_module do |m|
+          m.property :x, 10
+          m.property :y, 20
+          m.property :z, 30
+          m.property :a, 40
+          m.property :b, 50
+        end)
+    end
+  end
+end