From 3150516aab92c63fc22cf73d588e4584a8753b76 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 14 May 2023 09:13:29 +0900
Subject: Preprocess input parse.y from stdin

---
 ext/ripper/depend           |  5 ++---
 ext/ripper/tools/preproc.rb | 40 ++++++++++++++++++++++++----------------
 2 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/ext/ripper/depend b/ext/ripper/depend
index 9aba267533..a06330b645 100644
--- a/ext/ripper/depend
+++ b/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) $(srcdir)/tools/preproc.rb ripper.tmp.y --output=$@
-	$(Q) $(RM) ripper.tmp.y
+	$(Q) $(RUBY) $(top_srcdir)/tool/id2token.rb $(top_srcdir)/parse.y | \
+	$(RUBY) $(srcdir)/tools/preproc.rb --output=$@ - ripper.y
 
 check: .eventids2-check
 
diff --git a/ext/ripper/tools/preproc.rb b/ext/ripper/tools/preproc.rb
index cd85a5da61..f419fc3dbe 100644
--- a/ext/ripper/tools/preproc.rb
+++ b/ext/ripper/tools/preproc.rb
@@ -17,28 +17,36 @@ def main
   begin
     parser.parse!
   rescue OptionParser::ParseError => err
-    $stderr.puts err.message
-    $stderr.puts parser.help
-    exit false
-  end
-  unless ARGV.size == 1
-    abort "wrong number of arguments (#{ARGV.size} for 1)"
+    warn err.message
+    abort parser.help
   end
   out = "".dup
-  File.open(ARGV[0]) {|f|
-    prelude f, out
-    grammar f, out
-    usercode f, out
-  }
-  if output
-    File.open(output, 'w') {|f|
-      f.write out
+  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
+    File.open(ARGV[0]) {|f|
+      process f, out, ARGV[0]
     }
+  end
+  if output
+    File.write(output, 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
-- 
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