(puppetlabs#240) Fix output of default values that are expressions

Previously, parameters with a default value that was an expression were
not outputted into the documentation correctly. For example,

    Integer $param = 1 + 1,

Would be shown in the documentation to have a default value of “+”.

This switches to using `extract_tree_text` instead of `extract_text` to
get the text representation of the parsed Puppet code.

This also gets rid of the dependency on
`Puppet::Pops::Adapters::SourcePosAdapter`, which was [deprecated in
2017](puppetlabs/puppet@68498ad).

lib/puppet-strings/yard/handlers/ruby/data_type_handler.rb

@@ -150,12 +150,12 @@ def literal_Object(o)
 
     def literal_AccessExpression(o)
       # Extract the raw text of the Access Expression
-      ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(o).extract_text
+      PuppetStrings::Yard::Util.ast_to_text(o)
     end
 
     def literal_QualifiedReference(o)
       # Extract the raw text of the Qualified Reference
-      ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(o).extract_text
+      PuppetStrings::Yard::Util.ast_to_text(o)
     end
 
     # ----- The following methods are the same as the original Literal_evaluator

lib/puppet-strings/yard/parsers/puppet/statement.rb

@@ -21,9 +21,8 @@ class Statement
     def initialize(object, file)
       @file = file
 
-      adapter = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(object)
-      @source = adapter.extract_text
-      @line = adapter.line
+      @source = PuppetStrings::Yard::Util.ast_to_text(object)
+      @line = object.line
       @comments_range = nil
     end
 
@@ -85,13 +84,11 @@ def initialize(parameter)
         @name = parameter.name
         # Take the exact text for the type expression
         if parameter.type_expr
-          adapter = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(parameter.type_expr)
-          @type = adapter.extract_text
+          @type = PuppetStrings::Yard::Util.ast_to_text(parameter.type_expr)
         end
         # Take the exact text for the default value expression
         if parameter.value
-          adapter = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(parameter.value)
-          @value = adapter.extract_text
+          @value = PuppetStrings::Yard::Util.ast_to_text(parameter.value)
         end
       end
     end
@@ -149,8 +146,7 @@ def initialize(object, file)
       if object.respond_to? :return_type
         type = object.return_type
         if type
-          adapter = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(type)
-          @type = adapter.extract_text.gsub('>> ', '')
+          @type = PuppetStrings::Yard::Util.ast_to_text(type).gsub('>> ', '')
         end
       end
     end
@@ -184,12 +180,11 @@ def initialize(object, file)
       case type_expr
       when Puppet::Pops::Model::AccessExpression
         # TODO: I don't like rebuilding the source from the AST, but AccessExpressions don't expose the original source
-        @alias_of = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(type_expr.left_expr).extract_text + '['
-        @alias_of << type_expr.keys.map { |key| ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(key).extract_text }.join(', ')
+        @alias_of = PuppetStrings::Yard::Util.ast_to_text(type_expr.left_expr) + '['
+        @alias_of << type_expr.keys.map { |key| PuppetStrings::Yard::Util.ast_to_text(key) }.join(', ')
         @alias_of << ']'
       else
-        adapter = ::Puppet::Pops::Adapters::SourcePosAdapter.adapt(type_expr)
-        @alias_of = adapter.extract_text
+        @alias_of = PuppetStrings::Yard::Util.ast_to_text(type_expr)
       end
       @name = object.name
     end

lib/puppet-strings/yard/util.rb

@@ -79,4 +79,11 @@ def self.docstring_to_hash(docstring, select_tags=nil)
 
     hash
   end
+
+  # Convert Puppet AST to text.
+  # @param [Puppet::Pops::Model::PopsObject] ast The Puppet AST to convert to text.
+  # @return [String] Returns a string of Puppet code.
+  def self.ast_to_text(ast)
+    ast.locator.extract_tree_text(ast)
+  end
 end

spec/unit/puppet-strings/yard/util_spec.rb

@@ -47,4 +47,11 @@
       expect(subject.github_to_yard_links(str)).to eq('<a href="#label-Module+description"> module-description')
     end
   end
+
+  describe 'ast_to_text' do
+    it 'converts a simple AST correctly' do
+      model = Puppet::Pops::Parser::Parser.new().parse_string('class test {}').model
+      expect(subject.ast_to_text(model.body)).to eq('class test {}')
+    end
+  end
 end