1 files changed, 29 insertions, 0 deletions
diff --git a/tool/id2token.rb b/tool/id2token.rb
new file mode 100755
index 0000000000..4c7189c094
--- /dev/null
+++ b/tool/id2token.rb
@@ -0,0 +1,29 @@
+#! /usr/bin/ruby -p
+BEGIN {
+  require 'optparse'
+  vpath = ["."]
+  header = nil
+
+  opt = OptionParser.new do |o|
+    o.on('-v', '--vpath=DIR') {|dirs| vpath.concat dirs.split(File::PATH_SEPARATOR)}
+    header = o.order!(ARGV).shift
+  end or abort opt.opt_s
+
+  TOKENS = {}
+  vpath.find do |dir|
+    begin
+      h = File.read(File.join(dir, header))
+    rescue Errno::ENOENT
+      nil
+    else
+      h.scan(/^#define\s+RUBY_TOKEN_(\w+)\s+(\d+)/) do |token, id|
+        TOKENS[token] = id
+      end
+      true
+    end
+  end or abort "#{header} not found in #{vpath.inspect}"
+
+  TOKENS_RE = /\bRUBY_TOKEN\((#{TOKENS.keys.join('|')})\)\s*(?=\s)/
+}
+
+$_.gsub!(TOKENS_RE) {TOKENS[$1]} if /^%token/ =~ $_