JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / offlineasm / self_hash.rb

diff --git a/offlineasm/self_hash.rb b/offlineasm/self_hash.rb
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+# Copyright (C) 2011 Apple Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+# THE POSSIBILITY OF SUCH DAMAGE.
+
+require "digest/sha1"
+require "pathname"
+
+#
+# dirHash(directory, regexp) -> SHA1 hexdigest
+#
+# Returns a hash of all files in the given directory that fit the given
+# pattern.
+#
+
+def dirHash(directory, regexp)
+    directory = Pathname.new(directory)
+    contents = ""
+    Dir.foreach(directory) {
+        | entry |
+        if entry =~ regexp
+            contents += IO::read(directory + entry)
+        end
+    }
+    return Digest::SHA1.hexdigest(contents)
+end
+
+#
+# selfHash -> SHA1 hexdigest
+#
+# Returns a hash of the offlineasm source code. This allows dependency
+# tracking for not just changes in input, but also changes in the assembler
+# itself.
+#
+
+def selfHash
+    dirHash(Pathname.new(__FILE__).dirname, /\.rb$/)
+end
+