Revert "Remove flip-flop usages from build scripts"

This reverts commit 301fa452f7a9cdea922103e9c50d85a2d5652d0d.

1 files changed, 10 insertions, 17 deletions

diff --git a/ext/ripper/tools/preproc.rb b/ext/ripper/tools/preproc.rb
index 981237a585..a36c98689b 100644
--- a/ext/ripper/tools/preproc.rb
+++ b/ext/ripper/tools/preproc.rb
@@ -53,7 +53,6 @@ end
 
 def prelude(f, out)
   @exprs = {}
-  lex_state_def = false
   while line = f.gets
     case line
     when /\A%%/
@@ -62,24 +61,18 @@ def prelude(f, out)
     when /\A%token/, /\A%type/, /\A} <node(?>_\w+)?>/
       # types in %union which have corresponding set_yylval_* macro.
       out << line
-    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}+")
+      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
+      out << line
     end
   end
 end