1 files changed, 7 insertions, 5 deletions
diff --git a/tool/node_name.rb b/tool/node_name.rb
index fef7720a5a..dc0584e821 100755
--- a/tool/node_name.rb
+++ b/tool/node_name.rb
@@ -1,6 +1,8 @@
-#! ./miniruby
-while gets
-  if ~/enum node_type \{/..~/^\};/
-    ~/(NODE_.+),/ and puts("      case #{$1}:\n\treturn \"#{$1}\";")
-  end
+#! ./miniruby -n
+
+# Used when making Ruby to generate node_name.inc.
+# See common.mk for details.
+
+if (t ||= /^enum node_type \{/ =~ $_) and (t = /^\};/ !~ $_)
+  /(NODE_.+),/ =~ $_ and puts("      case #{$1}:\n\treturn \"#{$1}\";")
 end