Abstract out parsing YAML.

We always use the same code for loading YAML, but it was repeated in three
places. This commit moves YAML parsing to the Util class.

Author: hainesr

lib/cff/file.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2018-2022 The Ruby Citation File Format Developers.
+# Copyright (c) 2018-2024 The Ruby Citation File Format Developers.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -19,7 +19,6 @@
 require_relative 'version'
 
 require 'date'
-require 'yaml'
 
 ##
 module CFF
@@ -71,9 +70,7 @@ def self.read(file)
       content = ::File.read(file)
       comment = File.parse_comment(content)
 
-      new(
-        file, YAML.safe_load(content, permitted_classes: [Date, Time]), comment
-      )
+      new(file, Util.parse_yaml(content), comment)
     end
 
     # :call-seq:
@@ -91,7 +88,7 @@ def self.open(file)
       if ::File.exist?(file)
         content = ::File.read(file)
         comment = File.parse_comment(content)
-        yaml = YAML.safe_load(content, permitted_classes: [Date, Time])
+        yaml = Util.parse_yaml(content)
       else
         comment = CFF_COMMENT
         yaml = ''

lib/cff/index.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2018-2022 The Ruby Citation File Format Developers.
+# Copyright (c) 2018-2024 The Ruby Citation File Format Developers.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -25,8 +25,6 @@
 require_relative 'validatable'
 require_relative 'citable'
 
-require 'yaml'
-
 ##
 module CFF
   # Index is the core data structure for a CITATION.cff file. It can be
@@ -100,7 +98,7 @@ def initialize(param)
     #
     # Read a CFF Index from a String and parse it for subsequent manipulation.
     def self.read(index)
-      new(YAML.safe_load(index, permitted_classes: [Date, Time]))
+      new(Util.parse_yaml(index))
     end
 
     # :call-seq:

lib/cff/util.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2018-2022 The Ruby Citation File Format Developers.
+# Copyright (c) 2018-2024 The Ruby Citation File Format Developers.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@
 require_relative 'version'
 
 require 'rubygems'
+require 'yaml'
 
 ##
 module CFF
@@ -30,6 +31,10 @@ module Util
 
     module_function
 
+    def parse_yaml(string)
+      YAML.safe_load(string, permitted_classes: [Date, Time])
+    end
+
     def update_cff_version(version)
       return '' if version.nil? || version.empty?