* template/encdb.h.tmpl: define encoding index macros to use the index

statically from C source.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41727 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Jul  1 23:07:38 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* template/encdb.h.tmpl: define encoding index macros to use the index
+	  statically from C source.
+
 Mon Jul  1 22:57:19 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bary_mul2): New function.

template/encdb.h.tmpl

@@ -19,9 +19,14 @@ def check_duplication(defs, name, fn, line)
   end
 end
 
-count = 0
 lines = []
-encodings = []
+BUILTIN_ENCODINGS = {
+  'ASCII-8BIT' => 0,
+  'UTF-8' => 1,
+  'US-ASCII' => 2,
+}
+encodings = %w[ASCII-8BIT UTF-8 US-ASCII] # BUILTIN_ENCODINGS.keys is not available on cross compiling and used ruby 1.8
+count = encodings.size
 defs = {}
 encdirs = ARGV.dup
 encdirs << 'enc' if encdirs.empty?
@@ -44,6 +49,7 @@ encdirs.each do |encdir|
               name = $1
             end
             check_duplication(defs, $1, fn, $.)
+            next if BUILTIN_ENCODINGS[name]
             encodings << $1
             count += 1
           end
@@ -52,6 +58,7 @@ encdirs.each do |encdir|
           when /^\s*rb_enc_register\(\s*"([^"]+)"/
             count += 1
             line = nil
+            encodings << $1
           when /^ENC_REPLICATE\(\s*"([^"]+)"\s*,\s*"([^"]+)"/
             raise ArgumentError,
             '%s:%d: ENC_REPLICATE: %s is not defined yet. (replica %s)' %
@@ -73,11 +80,16 @@ encdirs.each do |encdir|
     end
   end
 end
-encodings.each do |e|
+encodings.each_with_index do |e, i|
 %>ENC_DEFINE("<%=e%>");
+#define ENCIDX_<%=e.tr('-', '_')%> <%=i%>
 % end
+% encidx = encodings.size - 1
 % lines.each do |line|
 <%=line%>
+%  if /^ENC_(?:DUMMY(?:_UNICODE)?|REPLICATE)\(\s*"([^"]+)/ =~ line
+#define ENCIDX_<%=$1.tr('-', '_')%> <%=encidx+=1%>
+%  end
 % end
 
 #define ENCODING_COUNT <%=count%>