1 files changed, 114 insertions, 0 deletions
diff --git a/ruby_1_9_3/ext/ripper/lib/ripper/sexp.rb b/ruby_1_9_3/ext/ripper/lib/ripper/sexp.rb
new file mode 100644
index 0000000000..37040e4c11
--- /dev/null
+++ b/ruby_1_9_3/ext/ripper/lib/ripper/sexp.rb
@@ -0,0 +1,114 @@
+#
+# $Id$
+#
+# Copyright (c) 2004,2005 Minero Aoki
+#
+# This program is free software.
+# You can distribute and/or modify this program under the Ruby License.
+# For details of Ruby License, see ruby/COPYING.
+#
+
+require 'ripper/core'
+
+class Ripper
+
+  # [EXPERIMENTAL]
+  # Parses +src+ and create S-exp tree.
+  # Returns more readable tree rather than Ripper.sexp_raw.
+  # This method is for mainly developper use.
+  #
+  #   require 'ripper'
+  #   require 'pp'
+  #
+  #   pp Ripper.sexp("def m(a) nil end")
+  #     #=> [:program,
+  #          [[:def,
+  #           [:@ident, "m", [1, 4]],
+  #           [:paren, [:params, [[:@ident, "a", [1, 6]]], nil, nil, nil, nil]],
+  #           [:bodystmt, [[:var_ref, [:@kw, "nil", [1, 9]]]], nil, nil, nil]]]]
+  #
+  def Ripper.sexp(src, filename = '-', lineno = 1)
+    SexpBuilderPP.new(src, filename, lineno).parse
+  end
+
+  # [EXPERIMENTAL]
+  # Parses +src+ and create S-exp tree.
+  # This method is for mainly developper use.
+  #
+  #   require 'ripper'
+  #   require 'pp'
+  #
+  #   pp Ripper.sexp_raw("def m(a) nil end")
+  #     #=> [:program,
+  #          [:stmts_add,
+  #           [:stmts_new],
+  #           [:def,
+  #            [:@ident, "m", [1, 4]],
+  #            [:paren, [:params, [[:@ident, "a", [1, 6]]], nil, nil, nil]],
+  #            [:bodystmt,
+  #             [:stmts_add, [:stmts_new], [:var_ref, [:@kw, "nil", [1, 9]]]],
+  #             nil,
+  #             nil,
+  #             nil]]]]
+  #
+  def Ripper.sexp_raw(src, filename = '-', lineno = 1)
+    SexpBuilder.new(src, filename, lineno).parse
+  end
+
+  class SexpBuilderPP < ::Ripper   #:nodoc:
+    private
+
+    PARSER_EVENT_TABLE.each do |event, arity|
+      if /_new\z/ =~ event.to_s and arity == 0
+        module_eval(<<-End, __FILE__, __LINE__ + 1)
+          def on_#{event}
+            []
+          end
+        End
+      elsif /_add\z/ =~ event.to_s
+        module_eval(<<-End, __FILE__, __LINE__ + 1)
+          def on_#{event}(list, item)
+            list.push item
+            list
+          end
+        End
+      else
+        module_eval(<<-End, __FILE__, __LINE__ + 1)
+          def on_#{event}(*args)
+            [:#{event}, *args]
+          end
+        End
+      end
+    end
+
+    SCANNER_EVENTS.each do |event|
+      module_eval(<<-End, __FILE__, __LINE__ + 1)
+        def on_#{event}(tok)
+          [:@#{event}, tok, [lineno(), column()]]
+        end
+      End
+    end
+  end
+
+  class SexpBuilder < ::Ripper   #:nodoc:
+    private
+
+    PARSER_EVENTS.each do |event|
+      module_eval(<<-End, __FILE__, __LINE__ + 1)
+        def on_#{event}(*args)
+          args.unshift :#{event}
+          args
+        end
+      End
+    end
+
+    SCANNER_EVENTS.each do |event|
+      module_eval(<<-End, __FILE__, __LINE__ + 1)
+        def on_#{event}(tok)
+          [:@#{event}, tok, [lineno(), column()]]
+        end
+      End
+    end
+  end
+
+end