Lexing of various primitive CSS tokens.

This includes brackes, commas, pipes (used for namespaces) and more.

lib/oga/css/lexer.rl

@@ -132,9 +132,12 @@ module Oga
 
         whitespace = [\t ]+;
 
-        action emit_space {
+        comma  = ',' @{ add_token(:T_COMMA) };
-          add_token(:T_SPACE)
+        hash   = '#' @{ add_token(:T_HASH) };
-        }
+        dot    = '.' @{ add_token(:T_DOT) };
+        pipe   = '|' @{ add_token(:T_PIPE) };
+        lbrack = '[' @{ add_token(:T_LBRACK) };
+        rbrack = ']' @{ add_token(:T_RBRACK) };
 
         # Identifiers
         #
@@ -148,8 +151,9 @@ module Oga
         }
 
         main := |*
+          whitespace | comma | hash | dot | pipe | lbrack | rbrack;
+
           identifier => emit_identifier;
-          whitespace => emit_space;
 
           any;
         *|;

spec/oga/css/lexer/paths_spec.rb

@@ -9,9 +9,59 @@ describe Oga::CSS::Lexer do
     example 'lex a path with two members' do
       lex_css('div h3').should == [
         [:T_IDENT, 'div'],
-        [:T_SPACE, nil],
         [:T_IDENT, 'h3']
       ]
     end
+
+    example 'lex two paths' do
+      lex_css('foo, bar').should == [
+        [:T_IDENT, 'foo'],
+        [:T_COMMA, nil],
+        [:T_IDENT, 'bar']
+      ]
+    end
+
+    example 'lex a path selecting an ID' do
+      lex_css('#foo').should == [
+        [:T_HASH, nil],
+        [:T_IDENT, 'foo']
+      ]
+    end
+
+    example 'lex a path selecting a class' do
+      lex_css('.foo').should == [
+        [:T_DOT, nil],
+        [:T_IDENT, 'foo']
+      ]
+    end
+
+    example 'lex a wildcard path' do
+      lex_css('*').should == [[:T_IDENT, '*']]
+    end
+
+    example 'lex a path containing a namespace name' do
+      lex_css('foo|bar').should == [
+        [:T_IDENT, 'foo'],
+        [:T_PIPE, nil],
+        [:T_IDENT, 'bar']
+      ]
+    end
+
+    example 'lex a path containing a namespace wildcard' do
+      lex_css('*|foo').should == [
+        [:T_IDENT, '*'],
+        [:T_PIPE, nil],
+        [:T_IDENT, 'foo']
+      ]
+    end
+
+    example 'lex a path containing a simple predicate' do
+      lex_css('foo[bar]').should == [
+        [:T_IDENT, 'foo'],
+        [:T_LBRACK, nil],
+        [:T_IDENT, 'bar'],
+        [:T_RBRACK, nil]
+      ]
+    end
   end
 end