Remove flip-flop usages from build scripts

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63669 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/ripper/tools/preproc.rb

@@ -41,6 +41,7 @@ end
 
 def prelude(f, out)
   @exprs = {}
+  lex_state_def = false
   while line = f.gets
     case line
     when /\A%%/
@@ -50,18 +51,24 @@ def prelude(f, out)
       out << line.sub(/<\w+>/, '<val>')
     when /\A%type/
       out << line.sub(/<\w+>/, '<val>')
-    else
-      if (/^enum lex_state_(?:bits|e) \{/ =~ line)..(/^\}/ =~ line)
-        case line
-        when /^\s*(EXPR_\w+),\s+\/\*(.+)\*\//
-          @exprs[$1.chomp("_bit")] = $2.strip
-        when /^\s*(EXPR_\w+)\s+=\s+(.+)$/
-          name = $1
-          val = $2.chomp(",")
-          @exprs[name] = "equals to " + (val.start_with?("(") ? "<tt>#{val}</tt>" : "+#{val}+")
-        end
-      end
+    when /^enum lex_state_(?:bits|e) \{/
+      lex_state_def = true
       out << line
+    when /^\}/
+      lex_state_def = false
+      out << line
+    else
+      out << line
+    end
+    if lex_state_def
+      case line
+      when /^\s*(EXPR_\w+),\s+\/\*(.+)\*\//
+        @exprs[$1.chomp("_bit")] = $2.strip
+      when /^\s*(EXPR_\w+)\s+=\s+(.+)$/
+        name = $1
+        val = $2.chomp(",")
+        @exprs[name] = "equals to " + (val.start_with?("(") ? "<tt>#{val}</tt>" : "+#{val}+")
+      end
     end
   end
 end

template/encdb.h.tmpl

@@ -40,20 +40,28 @@ encdirs.each do |encdir|
     files[fn] = true
     open(File.join(encdir,fn)) do |f|
       name = nil
+      skip_ifndef_ruby = false
+      encoding_def = false
       f.each_line do |line|
-        if (/^#ifndef RUBY/ =~ line)..(/^#endif/ =~ line)
-        elsif (/^OnigEncodingDefine/ =~ line)..(/"(.*?)"/ =~ line)
-          if $1
-            if name
-              lines << %[ENC_SET_BASE("#$1", "#{name}");]
-            else
-              name = $1
-            end
-            check_duplication(defs, $1, fn, $.)
-            next if BUILTIN_ENCODINGS[name]
-            encodings << $1
-            count += 1
+        case line
+        when /^#ifndef RUBY/
+          skip_ifndef_ruby = true
+        when /^#endif/
+          skip_ifndef_ruby = false
+        end
+        next if skip_ifndef_ruby
+        encoding_def = true if /^OnigEncodingDefine/ =~ line
+        if encoding_def && /"(.*?)"/ =~ line
+          encoding_def = false
+          if name
+            lines << %[ENC_SET_BASE("#$1", "#{name}");]
+          else
+            name = $1
           end
+          check_duplication(defs, $1, fn, $.)
+          next if BUILTIN_ENCODINGS[name]
+          encodings << $1
+          count += 1
         else
           case line
           when /^\s*rb_enc_register\(\s*"([^"]+)"/

template/transdb.h.tmpl

@@ -36,17 +36,18 @@ transdirs.each do |transdir|
     files[fn] = true
     path = File.join(transdir,fn)
     open(path) do |f|
+      transcoder_def = false
       f.each_line do |line|
-        if (/^static const rb_transcoder/ =~ line)..(/"(.*?)"\s*,\s*"(.*?)"/ =~ line)
-          if $1 && $2
-            from_to = "%s to %s" % [$1, $2]
-            if converters[from_to]
-              raise ArgumentError, '%s:%d: transcode "%s" is already registered at %s:%d' %
-              [path, $., from_to, *converters[from_to].values_at(3, 4)]
-            else
-              converters[from_to] = [$1, $2, fn[0..-3], path, $.]
-              converter_list << from_to
-            end
+        transcoder_def = true if /^static const rb_transcoder/ =~ line
+        if transcoder_def && /"(.*?)"\s*,\s*"(.*?)"/ =~ line
+          transcoder_def = false
+          from_to = "%s to %s" % [$1, $2]
+          if converters[from_to]
+            raise ArgumentError, '%s:%d: transcode "%s" is already registered at %s:%d' %
+            [path, $., from_to, *converters[from_to].values_at(3, 4)]
+          else
+            converters[from_to] = [$1, $2, fn[0..-3], path, $.]
+            converter_list << from_to
           end
         end
       end