opal · May 13, 2015 · May 14, 2015 · May 14, 2015 · May 15, 2015
diff --git a/lib/mspec/opal/rake_task.rb b/lib/mspec/opal/rake_task.rb
@@ -163,7 +163,7 @@ def add_files specs, tag = ''
 
       def paths_from_glob pattern
         Dir.glob(File.expand_path(pattern)).map do |s|
-          s.sub(/^#{basedir}\//, '').sub(/\.rb$/, '')
+          s.sub(/\A#{basedir}\//, '').sub(/\.rb\z/, '')
         end
       end
 

diff --git a/lib/opal/builder.rb b/lib/opal/builder.rb
@@ -85,7 +85,7 @@ def tree_requires(asset, path)
         globs = extensions.map { |ext| File.join base, tree, '**', "*.#{ext}" }
 
         Dir[*globs].map do |file|
-          Pathname(file).relative_path_from(Pathname(base)).to_s.gsub(/(\.js)?(\.(?:#{extensions.join '|'}))$/, '')
+          Pathname(file).relative_path_from(Pathname(base)).to_s.gsub(/(\.js)?(\.(?:#{extensions.join '|'}))#{REGEXP_END}/, '')
         end
       end
     end
@@ -102,7 +102,7 @@ def read(path)
     end
 
     def process_require(filename, options)
-      filename.gsub!(/\.(rb|js|opal)$/, '')
+      filename.gsub!(/\.(rb|js|opal)#{REGEXP_END}/, '')
       return if prerequired.include?(filename)
       return if already_processed.include?(filename)
       already_processed << filename

diff --git a/lib/opal/builder_processors.rb b/lib/opal/builder_processors.rb
@@ -27,7 +27,7 @@ def self.handles(*extensions)
         matches = extensions.join('|')
         matches = "(#{matches})" if extensions.size == 1
 
-        @match_regexp = Regexp.new "\\.#{matches}$"
+        @match_regexp = Regexp.new "\\.#{matches}#{REGEXP_END}"
       end
 
       def self.extensions
@@ -87,7 +87,7 @@ def source_map
 
       def compiled
         @compiled ||= begin
-          compiler = compiler_for(@source, file: @filename.gsub(/\.(rb|js|opal)$/, ''))
+          compiler = compiler_for(@source, file: @filename.gsub(/\.(rb|js|opal)#{REGEXP_END}/, ''))
           compiler.compile
           compiler
         end

diff --git a/lib/opal/erb.rb b/lib/opal/erb.rb
@@ -76,7 +76,7 @@ def find_code(result)
       end
 
       def wrap_compiled(result)
-        path = @file_name.sub(/\.opalerb$/, '')
+        path = @file_name.sub(/\.opalerb#{REGEXP_END}/, '')
         result = "Template.new('#{path}') do |output_buffer|\noutput_buffer.append(\"#{result}\")\noutput_buffer.join\nend\n"
       end
     end

diff --git a/lib/opal/nodes/call.rb b/lib/opal/nodes/call.rb
@@ -90,7 +90,7 @@ def recv_sexp
       end
 
       def attr_assignment?
-        @assignment ||= meth.to_s =~ /^[\da-z]+\=$/i
+        @assignment ||= meth.to_s =~ /#{REGEXP_START}[\da-z]+\=#{REGEXP_END}/i
       end
 
       # Used to generate the code to use this sexp as an ivar var reference

diff --git a/lib/opal/nodes/call_special.rb b/lib/opal/nodes/call_special.rb
@@ -12,7 +12,7 @@ class AttrAssignNode < CallNode
 
       def default_compile
         # Skip, for now, if the method has square brackets: []=
-        return super if meth.to_s !~ /^\w+=$/
+        return super if meth.to_s !~ /#{REGEXP_START}\w+=#{REGEXP_END}/
 
         with_temp do |args_tmp|
           with_temp do |recv_tmp|

diff --git a/lib/opal/nodes/helpers.rb b/lib/opal/nodes/helpers.rb
@@ -1,19 +1,21 @@
+require 'opal/regexp_anchors'
+
 module Opal
   module Nodes
     module Helpers
 
       # Reserved javascript keywords - we cannot create variables with the
       # same name (ref: http://stackoverflow.com/a/9337272/601782)
-      ES51_RESERVED_WORD = /^(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$/
+      ES51_RESERVED_WORD = /#{REGEXP_START}(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)#{REGEXP_END}/
 
       # ES3 reserved words that aren’t ES5.1 reserved words
-      ES3_RESERVED_WORD_EXCLUSIVE = /^(?:int|byte|char|goto|long|final|float|short|double|native|throws|boolean|abstract|volatile|transient|synchronized)$/
+      ES3_RESERVED_WORD_EXCLUSIVE = /#{REGEXP_START}(?:int|byte|char|goto|long|final|float|short|double|native|throws|boolean|abstract|volatile|transient|synchronized)#{REGEXP_END}/
 
       # Immutable properties of the global object
-      IMMUTABLE_PROPS = /^(?:NaN|Infinity|undefined)$/
+      IMMUTABLE_PROPS = /#{REGEXP_START}(?:NaN|Infinity|undefined)#{REGEXP_END}/
 
       # Doesn't take in account utf8
-      BASIC_IDENTIFIER_RULES = /^[$_a-z][$_a-z\d]*$/i
+      BASIC_IDENTIFIER_RULES = /#{REGEXP_START}[$_a-z][$_a-z\d]*#{REGEXP_END}/i
 
 
       def property(name)

diff --git a/lib/opal/parser/lexer.rb b/lib/opal/parser/lexer.rb
@@ -1,3 +1,4 @@
+require 'opal/regexp_anchors'
 require 'strscan'
 require 'opal/parser/keywords'
 
@@ -558,7 +559,7 @@ def process_identifier(matched, cmd_start)
             matched += scanner.matched
           end
 
-        elsif matched =~ /^[A-Z]/
+        elsif matched =~ /#{REGEXP_START}[A-Z]/
           result = :tCONSTANT
         else
           result = :tIDENTIFIER
@@ -627,7 +628,7 @@ def process_identifier(matched, cmd_start)
         @lex_state = :expr_end
       end
 
-      return matched =~ /^[A-Z]/ ? :tCONSTANT : :tIDENTIFIER
+      return matched =~ /#{REGEXP_START}[A-Z]/ ? :tCONSTANT : :tIDENTIFIER
     end
 
     # Does the heavy lifting for `next_token`.

diff --git a/lib/opal/regexp_anchors.rb b/lib/opal/regexp_anchors.rb
@@ -0,0 +1,5 @@
+module Opal
+  REGEXP_START = RUBY_ENGINE == 'opal' ? '^' : '\A'.freeze
+  REGEXP_END = RUBY_ENGINE == 'opal' ? '$' : '\z'.freeze 
+end
+
diff --git a/lib/opal/sprockets/erb.rb b/lib/opal/sprockets/erb.rb
@@ -11,7 +11,7 @@ def initialize_engine
       end
 
       def evaluate(context, locals, &block)
-        compiler = Opal::ERB::Compiler.new(@data, context.logical_path.sub(/^templates\//, ''))
+        compiler = Opal::ERB::Compiler.new(@data, context.logical_path.sub(/#{REGEXP_START}templates\//, ''))
         @data = compiler.prepared_source
         super
       end

diff --git a/lib/opal/sprockets/processor.rb b/lib/opal/sprockets/processor.rb
@@ -75,7 +75,7 @@ def process_required_trees(required_trees, context)
 
       # This is the root dir of the logical path, we need this because
       # the compiler gives us the path relative to the file's logical path.
-      dirname = File.dirname(file).gsub(/#{Regexp.escape File.dirname(context.logical_path)}$/, '')
+      dirname = File.dirname(file).gsub(/#{Regexp.escape File.dirname(context.logical_path)}#{REGEXP_END}/, '')
       dirname = Pathname(dirname)
 
       required_trees.each do |original_required_tree|
@@ -117,14 +117,14 @@ def process_required_trees(required_trees, context)
     end
 
     def self.load_asset_code(sprockets, name)
-      asset = sprockets[name.sub(/(\.(js|rb|opal))*$/, '.js')]
+      asset = sprockets[name.sub(/(\.(js|rb|opal))*#{REGEXP_END}/, '.js')]
       return '' if asset.nil?
 
       opal_extnames = sprockets.engines.map do |ext, engine|
         ext if engine <= ::Opal::Processor
       end.compact
 
-      module_name = -> asset { asset.logical_path.sub(/\.js$/, '') }
+      module_name = -> asset { asset.logical_path.sub(/\.js#{REGEXP_END}/, '') }
       path_extnames = -> path { File.basename(path).scan(/\.[^.]+/) }
       mark_as_loaded = -> path { "Opal.mark_as_loaded(#{path.inspect});" }
       processed_by_opal = -> asset { (path_extnames[asset.pathname] & opal_extnames).any? }

diff --git a/lib/opal/sprockets/source_map_server.rb b/lib/opal/sprockets/source_map_server.rb
@@ -45,13 +45,13 @@ def cache_set(key, value)
     end
 
     def self.get_map_cache(sprockets, logical_path)
-      logical_path = logical_path.gsub(/\.js$/, '')
+      logical_path = logical_path.gsub(/\.js#{REGEXP_END}/, '')
       cache_key = cache_key_for_path(logical_path+'.map')
       cache(sprockets).cache_get(cache_key)
     end
 
     def self.set_map_cache(sprockets, logical_path, map_contents)
-      logical_path = logical_path.gsub(/\.js$/, '')
+      logical_path = logical_path.gsub(/\.js#{REGEXP_END}/, '')
       cache_key = cache_key_for_path(logical_path+'.map')
       cache(sprockets).cache_set(cache_key, map_contents)
     end
@@ -61,7 +61,7 @@ def self.cache(sprockets)
     end
 
     def self.cache_key_for_path(logical_path)
-      base_name = logical_path.gsub(/\.js$/, '')
+      base_name = logical_path.gsub(/\.js#{REGEXP_END}/, '')
       File.join('opal', 'source_maps', base_name)
     end
 
@@ -98,7 +98,7 @@ def call(env)
         return [200, {"Content-Type" => "text/json"}, [source.to_s]]
       when %r{^(.*)\.rb$}
         begin
-          asset = sprockets.resolve(path_info.sub(/\.rb$/,''))
+          asset = sprockets.resolve(path_info.sub(/\.rb#{REGEXP_END}/,''))
         rescue Sprockets::FileNotFound
           return not_found(path_info)
         end