Fixed typo in mip (spurious character after name:) and fixed $copy pa…

…th from mie to mip description to accomodate new schema change.

arch/csr/mie.yaml

@@ -8,7 +8,7 @@ address: 0x304
 priv_mode: M
 length: MXLEN
 definedBy: Sm
-description: "$copy: mip.yaml#/mip/description"
+description: "$copy: mip.yaml#/description"
 fields:
   SSIE:
     location: 1

arch/csr/mip.yaml

@@ -2,7 +2,7 @@
 
 $schema: "csr_schema.json#"
 kind: csr
-name: mip>
+name: mip
 long_name: Machine Interrupt Pending
 address: 0x344
 priv_mode: M

lib/test/test_yaml_loader.rb

@@ -208,74 +208,6 @@ def test_that_double_inherits_doesnt_delete_keys
     assert_equal({ "key1" => "value1", "key2" => "value2", "key3" => "value3_new", "key4" => "value4", "key5" => "value5", "key6" => "value6_new" }, doc["child"])
   end
 
-# Removed by @dhower-qc in https://github.com/riscv-software-src/riscv-unified-db/commit/7d10d70f122de6263ce7907dee8daeddc0a0af40
-# Waiting for response in https://github.com/riscv-software-src/riscv-unified-db/pull/271
-#
-#  def test_refs_in_the_same_document
-#    yaml = <<~YAML
-#      $defs:
-#        target1: A string
-#        target2:
-#          a: hash
-#
-#      obj1:
-#        $ref: "#/$defs/target2"
-#
-#      obj2:
-#        $ref: "#/$defs/target2"
-#        target2: Should disappear
-#
-#      obj3:
-#        target2: Should disappear
-#        $ref: "#/$defs/target2"
-#    YAML
-#
-#    f = Tempfile.new("yml")
-#    f.write(yaml)
-#    f.flush
-#
-#    doc = YamlLoader.load(f.path)
-#    assert_equal({ "a" => "hash" }, doc["obj1"])
-#    assert_equal({ "a" => "hash" }, doc["obj2"])
-#    assert_equal({ "a" => "hash" }, doc["obj3"])
-#  end
-#
-#  def test_refs_in_the_different_document
-#    yaml1 = <<~YAML
-#      $defs:
-#        target1: A string
-#        target2:
-#          a: hash
-#    YAML
-#
-#    f1 = Tempfile.new("yml")
-#    f1.write(yaml1)
-#    f1.flush
-#    f1_path = Pathname.new(f1.path)
-#
-#    yaml2 = <<~YAML
-#      obj1:
-#        $ref: "#{f1_path.basename}#/$defs/target2"
-#
-#      obj2:
-#        $ref: "#{f1_path.basename}#/$defs/target2"
-#        target2: Should disappear
-#
-#      obj3:
-#        target2: Should disappear
-#        $ref: "#{f1_path.basename}#/$defs/target2"
-#    YAML
-#
-#    f2 = Tempfile.new("yml")
-#    f2.write(yaml2)
-#    f2.flush
-#
-#    doc = YamlLoader.load(f2.path)
-#    assert_equal({ "a" => "hash" }, doc["obj1"])
-#    assert_equal({ "a" => "hash" }, doc["obj2"])
-#    assert_equal({ "a" => "hash" }, doc["obj3"])
-#  end
-
   def test_inherits_in_the_same_document
     yaml = <<~YAML
       $defs:

lib/yaml_loader.rb

@@ -142,7 +142,7 @@ def self.expand(filename, obj, yaml_opts = {})
         obj[key] =
         if value.is_a?(String) && value.start_with?("$copy:")
           copy_target = value.delete_prefix("$copy:").lstrip
-          self.get_ref_target_obj(filename, copy_target, yaml_opts)
+          self.get_copy_target_obj(filename, copy_target, yaml_opts)
         else
           expand(filename, value, yaml_opts)
         end
@@ -162,35 +162,35 @@ def self.expand(filename, obj, yaml_opts = {})
   end
 
   # @param filename [String,Pathname] path to the YAML file
-  # @param ref_target [String]
+  # @param copy_target [String]
   # @param yaml_opts [Hash] options to pass to YAML.load_file
   # @return [Object]
-  def self.get_ref_target_obj(filename, ref_target, yaml_opts)
-    relative_path = ref_target.split("#")[0]
+  def self.get_copy_target_obj(filename, copy_target, yaml_opts)
+    relative_path = copy_target.split("#")[0]
     if relative_path.empty?
       # this is a reference in the same document
       obj_doc = YAML.load_file(filename, **yaml_opts)
-      obj_path = ref_target.split("#")[1].split("/")[1..]
+      obj_path = copy_target.split("#")[1].split("/")[1..]
       target_obj = obj_doc.dig(*obj_path)
-      raise DereferenceError, "$ref: #{obj_path} cannot be found in file #{filename}" if target_obj.nil?
+      raise DereferenceError, "$copy: #{obj_path} referenced to same file cannot be found in file #{filename}" if target_obj.nil?
 
       ref = expand(filename, target_obj, yaml_opts)
       if ref.nil?
-        raise DereferenceError, "JSON Path #{obj_path} does not exist in file #{filename}"
+        raise DereferenceError, "$copy: JSON Path #{obj_path} referenced to same file does not exist in file #{filename}"
       end
 
       ref
     else
       target_filename = File.realpath(File.join(filename.dirname, relative_path))
 
       obj_doc = YamlLoader.load(target_filename, yaml_opts)
-      obj_path = ref_target.split("#")[1].split("/")[1..]
+      obj_path = copy_target.split("#")[1].split("/")[1..]
       target_obj = obj_doc.dig(*obj_path)
-      raise "$ref: #{obj_path} cannot be found in file #{target_filename}" if target_obj.nil?
+      raise DereferenceError, "$copy: #{obj_path} referenced from file #{filename} cannot be found in file #{target_filename}" if target_obj.nil?
 
       ref = expand(target_filename, target_obj, yaml_opts)
       if ref.nil?
-        raise DereferenceError, "JSON Path #{obj_path} does not exist in file #{target_filename}"
+        raise DereferenceError, "$copy: JSON Path #{obj_path} referenced from file #{filename} does not exist in file #{target_filename}"
       end
 
       ref