Use YARP as the backend

Author: kddnewton

bin/console

@@ -3,7 +3,7 @@
 
 require "bundler/setup"
 require "syntax_tree"
-require "syntax_tree/reflection"
+# require "syntax_tree/reflection"
 
 require "irb"
 IRB.start(__FILE__)

lib/syntax_tree.rb

@@ -2,14 +2,16 @@
 
 require "prettier_print"
 require "pp"
-require "ripper"
+# require "ripper"
+require "yarp"
 
-require_relative "syntax_tree/node"
+# require_relative "syntax_tree/node"
 require_relative "syntax_tree/basic_visitor"
 require_relative "syntax_tree/visitor"
 
+require_relative "syntax_tree/formatting"
 require_relative "syntax_tree/formatter"
-require_relative "syntax_tree/parser"
+# require_relative "syntax_tree/parser"
 require_relative "syntax_tree/version"
 
 # Syntax Tree is a suite of tools built on top of the internal CRuby parser. It
@@ -120,9 +122,11 @@ def self.mutation
 
   # Parses the given source and returns the syntax tree.
   def self.parse(source)
-    parser = Parser.new(source)
-    response = parser.parse
-    response unless parser.error?
+    # parser = Parser.new(source)
+    # response = parser.parse
+    # response unless parser.error?
+    result = YARP.parse(source)
+    result.value if result.errors.empty?
   end
 
   # Parses the given file and returns the syntax tree.

lib/syntax_tree/formatter.rb

@@ -224,5 +224,10 @@ def seplist(list, sep = nil, iter_method = :each)
     def text(string)
       target << string
     end
+
+    # Slice out a portion of the source code and add it to the target.
+    def slice(location)
+      target << source.byteslice(location.start_offset...location.end_offset)
+    end
   end
 end