1 files changed, 67 insertions, 0 deletions
diff --git a/lib/bundler/yaml_serializer.rb b/lib/bundler/yaml_serializer.rb
new file mode 100644
index 0000000000..327baa4ee7
--- /dev/null
+++ b/lib/bundler/yaml_serializer.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+module Bundler
+  # A stub yaml serializer that can handle only hashes and strings (as of now).
+  module YAMLSerializer
+  module_function
+
+    def dump(hash)
+      yaml = String.new("---")
+      yaml << dump_hash(hash)
+    end
+
+    def dump_hash(hash)
+      yaml = String.new("\n")
+      hash.each do |k, v|
+        yaml << k << ":"
+        if v.is_a?(Hash)
+          yaml << dump_hash(v).gsub(/^(?!$)/, "  ") # indent all non-empty lines
+        else
+          yaml << " " << v.to_s.gsub(/\s+/, " ").inspect << "\n"
+        end
+      end
+      yaml
+    end
+
+    SCAN_REGEX = /
+      ^
+      ([ ]*) # indentations
+      (.*) # key
+      (?::(?=\s)) # :  (without the lookahead the #key includes this when : is present in value)
+      [ ]?
+      (?: !\s)? # optional exclamation mark found with ruby 1.9.3
+      (['"]?) # optional opening quote
+      (.*) # value
+      \3 # matching closing quote
+      $
+    /xo
+
+    def load(str)
+      res = {}
+      stack = [res]
+      str.scan(SCAN_REGEX).each do |(indent, key, _, val)|
+        key = convert_to_backward_compatible_key(key)
+        depth = indent.scan(/  /).length
+        if val.empty?
+          new_hash = {}
+          stack[depth][key] = new_hash
+          stack[depth + 1] = new_hash
+        else
+          stack[depth][key] = val
+        end
+      end
+      res
+    end
+
+    # for settings' keys
+    def convert_to_backward_compatible_key(key)
+      key = "#{key}/" if key =~ /https?:/i && key !~ %r{/\Z}
+      key = key.gsub(".", "__") if key.include?(".")
+      key
+    end
+
+    class << self
+      private :dump_hash, :convert_to_backward_compatible_key
+    end
+  end
+end