Add a SyntaxTree.parse convenience method

Author: kddnewton

lib/syntax_tree.rb

@@ -101,8 +101,8 @@ def initialize(error, lineno, column)
   # array and attach them to themselves.
   attr_accessor :comments
 
-  def initialize(source)
-    super(source)
+  def initialize(source, *)
+    super
 
     # We keep the source around so that we can refer back to it when we're
     # generating the AST. Sometimes it's easier to just reference the source
@@ -169,6 +169,12 @@ def initialize(source)
     end
   end
 
+  def self.parse(source)
+    parser = new(source)
+    response = parser.parse
+    response unless parser.error?
+  end
+
   private
 
   # ----------------------------------------------------------------------------

test/syntax_tree_test.rb

@@ -17,12 +17,12 @@ class SyntaxTreeTest < Minitest::Test
     # --------------------------------------------------------------------------
 
     def test_multibyte
-      assign = SyntaxTree.new('🎉 + 🎉').parse.statements.body.first
+      assign = SyntaxTree.parse('🎉 + 🎉').statements.body.first
       assert_equal(5, assign.location.end_char)
     end
 
     def test_parse_error
-      assert_raises(ParseError) { SyntaxTree.new('<>').parse }
+      assert_raises(ParseError) { SyntaxTree.parse('<>') }
     end
 
     def test_next_statement_start
@@ -32,7 +32,7 @@ def method # comment
         end
       SOURCE
 
-      bodystmt = SyntaxTree.new(source).parse.statements.body.first.bodystmt
+      bodystmt = SyntaxTree.parse(source).statements.body.first.bodystmt
       assert_equal(20, bodystmt.location.start_char)
     end