added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 36 insertions, 0 deletions

diff --git a/trunk/ext/pty/lib/expect.rb b/trunk/ext/pty/lib/expect.rb
new file mode 100644
index 0000000000..08191b05b9
--- /dev/null
+++ b/trunk/ext/pty/lib/expect.rb
@@ -0,0 +1,36 @@
+$expect_verbose = false
+
+class IO
+  def expect(pat,timeout=9999999)
+    buf = ''
+    case pat
+    when String
+      e_pat = Regexp.new(Regexp.quote(pat))
+    when Regexp
+      e_pat = pat
+    end
+    while true
+      if !IO.select([self],nil,nil,timeout) or eof? then
+        result = nil
+        break
+      end
+      c = getc.chr
+      buf << c
+      if $expect_verbose
+        STDOUT.print c
+        STDOUT.flush
+      end
+      if mat=e_pat.match(buf) then
+        result = [buf,*mat.to_a[1..-1]]
+        break
+      end
+    end
+    if block_given? then
+      yield result
+    else
+      return result
+    end
+    nil
+  end
+end
+