Preprocess input parse.y from stdin

Merged: https://github.com/ruby/ruby/pull/7807

ext/ripper/depend

@@ -21,9 +21,8 @@ static: check
 
 ripper.y: $(srcdir)/tools/preproc.rb $(srcdir)/tools/dsl.rb $(top_srcdir)/parse.y $(top_srcdir)/defs/id.def
 	$(ECHO) extracting $@ from $(top_srcdir)/parse.y
-	$(Q) $(RUBY) $(top_srcdir)/tool/id2token.rb $(top_srcdir)/parse.y > ripper.tmp.y
+	$(Q) $(RUBY) $(top_srcdir)/tool/id2token.rb $(top_srcdir)/parse.y | \
-	$(Q) $(RUBY) $(srcdir)/tools/preproc.rb ripper.tmp.y --output=$@
+	$(RUBY) $(srcdir)/tools/preproc.rb --output=$@ - ripper.y
-	$(Q) $(RM) ripper.tmp.y
 
 check: .eventids2-check
 

ext/ripper/tools/preproc.rb

@@ -17,28 +17,36 @@ def main
   begin
     parser.parse!
   rescue OptionParser::ParseError => err
-    $stderr.puts err.message
+    warn err.message
-    $stderr.puts parser.help
+    abort parser.help
-    exit false
   end
+  out = "".dup
+  if ARGV[0] == "-"
+    unless ARGV.size == 2
+      abort "wrong number of arguments (#{ARGV.size} for 2)"
+    end
+    process STDIN, out, ARGV[1]
+  else
     unless ARGV.size == 1
       abort "wrong number of arguments (#{ARGV.size} for 1)"
     end
-  out = "".dup
     File.open(ARGV[0]) {|f|
-    prelude f, out
+      process f, out, ARGV[0]
-    grammar f, out
-    usercode f, out
     }
+  end
   if output
-    File.open(output, 'w') {|f|
+    File.write(output, out)
-      f.write out
-    }
   else
     print out
   end
 end
 
+def process(f, out, path)
+  prelude f, out
+  grammar f, out
+  usercode f, out, path
+end
+
 def prelude(f, out)
   @exprs = {}
   lex_state_def = false
@@ -95,13 +103,13 @@ def grammar(f, out)
   end
 end
 
-def usercode(f, out)
+def usercode(f, out, path)
   require 'erb'
   compiler = ERB::Compiler.new('%-')
   compiler.put_cmd = compiler.insert_cmd = "out.<<"
   lineno = f.lineno
   src, = compiler.compile(f.read)
-  eval(src, binding, f.path, lineno)
+  eval(src, binding, path, lineno)
 end
 
 main