1 files changed, 23 insertions, 0 deletions
diff --git a/jni/ruby/lib/rake/backtrace.rb b/jni/ruby/lib/rake/backtrace.rb
new file mode 100644
index 0000000..dc18773
--- /dev/null
+++ b/jni/ruby/lib/rake/backtrace.rb
@@ -0,0 +1,23 @@
+module Rake
+  module Backtrace # :nodoc: all
+    SYS_KEYS  = RbConfig::CONFIG.keys.grep(/(?:[a-z]prefix|libdir)\z/)
+    SYS_PATHS = RbConfig::CONFIG.values_at(*SYS_KEYS).uniq +
+      [ File.join(File.dirname(__FILE__), "..") ]
+
+    SUPPRESSED_PATHS = SYS_PATHS.
+      map { |s| s.gsub("\\", "/") }.
+      map { |f| File.expand_path(f) }.
+      reject { |s| s.nil? || s =~ /^ *$/ }
+    SUPPRESSED_PATHS_RE = SUPPRESSED_PATHS.map { |f| Regexp.quote(f) }.join("|")
+    SUPPRESSED_PATHS_RE << "|^org\\/jruby\\/\\w+\\.java" if
+      Object.const_defined?(:RUBY_ENGINE) and RUBY_ENGINE == 'jruby'
+
+    SUPPRESS_PATTERN = %r!(\A(#{SUPPRESSED_PATHS_RE})|bin/rake:\d+)!i
+
+    def self.collapse(backtrace)
+      pattern = Rake.application.options.suppress_backtrace_pattern ||
+                SUPPRESS_PATTERN
+      backtrace.reject { |elem| elem =~ pattern }
+    end
+  end
+end