Factor out all CodeRay code to Pry::SyntaxHighlighter

This moves all the code related syntax highlighting and tokenization to a
wrapper class of CodeRay. Benefits:

* we reduce duplication (no need to call `scan(code, :ruby).term` everywhere)
* swapping CodeRay becomes easier because it's isolated in one class

2 files changed, 3 insertions, 3 deletions

diff --git a/lib/pry/code/code_file.rb b/lib/pry/code/code_file.rb
index 7ac6ef0e..d120af84 100644
--- a/lib/pry/code/code_file.rb
+++ b/lib/pry/code/code_file.rb
@@ -82,8 +82,8 @@ class Pry
     # @param [String] filename
     # @param [Symbol] default (:unknown) the file type to assume if none could be
     #   detected.
-    # @return [Symbol, nil] The CodeRay type of a file from its extension, or
-    #   `nil` if `:unknown`.
+    # @return [Symbol, nil] The SyntaxHighlighter type of a file from its
+    #   extension, or `nil` if `:unknown`.
     def type_from_filename(filename, default = :unknown)
       _, @code_type = EXTENSIONS.find do |k, _|
         k.any? { |ext| ext == File.extname(filename) }
diff --git a/lib/pry/code/loc.rb b/lib/pry/code/loc.rb
index 5ec4ed87..905c7693 100644
--- a/lib/pry/code/loc.rb
+++ b/lib/pry/code/loc.rb
@@ -54,7 +54,7 @@ class Pry
       # @param [Symbol] code_type
       # @return [void]
       def colorize(code_type)
-        tuple[0] = CodeRay.scan(line, code_type).term
+        tuple[0] = SyntaxHighlighter.highlight(line, code_type)
       end
 
       # Prepends the line number `lineno` to the `line`.