From 5922d927af4d8e49c55ffd313f8186cab8255ff6 Mon Sep 17 00:00:00 2001
From: Daniel Gollahon <daniel@blockscore.com>
Date: Sun, 9 Oct 2016 15:48:00 -0700
Subject: [PATCH] Add mutation for $ -> \z

---
 config/flay.yml                               |  2 +-
 lib/mutant.rb                                 |  1 +
 lib/mutant/mutator/node/generic.rb            |  1 +
 .../mutator/node/regexp/end_of_line_anchor.rb | 21 +++++++++++++++++++
 meta/regexp/regexp_eol_anchor.rb              |  8 +++++++
 meta/regexp/regexp_eos_anchor.rb              |  6 ++++++
 6 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 lib/mutant/mutator/node/regexp/end_of_line_anchor.rb
 create mode 100644 meta/regexp/regexp_eol_anchor.rb
 create mode 100644 meta/regexp/regexp_eos_anchor.rb

diff --git a/config/flay.yml b/config/flay.yml
index 575c95ff..9435d93a 100644
--- a/config/flay.yml
+++ b/config/flay.yml
@@ -1,3 +1,3 @@
 ---
 threshold: 16
-total_score: 1306
+total_score: 1312
diff --git a/lib/mutant.rb b/lib/mutant.rb
index 7e6c54b5..493c5da8 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -93,6 +93,7 @@ require 'mutant/mutator/node/generic'
 require 'mutant/mutator/node/regexp'
 require 'mutant/mutator/node/regexp/alternation_meta'
 require 'mutant/mutator/node/regexp/character_type'
+require 'mutant/mutator/node/regexp/end_of_line_anchor'
 require 'mutant/mutator/node/literal'
 require 'mutant/mutator/node/literal/boolean'
 require 'mutant/mutator/node/literal/range'
diff --git a/lib/mutant/mutator/node/generic.rb b/lib/mutant/mutator/node/generic.rb
index 0c520ddf..63075da9 100644
--- a/lib/mutant/mutator/node/generic.rb
+++ b/lib/mutant/mutator/node/generic.rb
@@ -40,6 +40,7 @@ module Mutant
           regexp_alternation_meta
           regexp_bol_anchor
           regexp_digit_type
+          regexp_eol_anchor
           regexp_nondigit_type
           regexp_nonspace_type
           regexp_nonword_boundary_anchor
diff --git a/lib/mutant/mutator/node/regexp/end_of_line_anchor.rb b/lib/mutant/mutator/node/regexp/end_of_line_anchor.rb
new file mode 100644
index 00000000..ac91ef8e
--- /dev/null
+++ b/lib/mutant/mutator/node/regexp/end_of_line_anchor.rb
@@ -0,0 +1,21 @@
+module Mutant
+  class Mutator
+    class Node
+      module Regexp
+        # Mutator for end of line anchor `$`
+        class EndOfLineAnchor < Node
+          handle(:regexp_eol_anchor)
+
+          # Emit mutations
+          #
+          # Replace `$` with `\z`
+          #
+          # @return [undefined]
+          def dispatch
+            emit(s(:regexp_eos_anchor))
+          end
+        end # EndOfLineAnchor
+      end # Regexp
+    end # Node
+  end # Mutator
+end # Mutant
diff --git a/meta/regexp/regexp_eol_anchor.rb b/meta/regexp/regexp_eol_anchor.rb
new file mode 100644
index 00000000..f17aa835
--- /dev/null
+++ b/meta/regexp/regexp_eol_anchor.rb
@@ -0,0 +1,8 @@
+Mutant::Meta::Example.add :regexp_eol_anchor do
+  source '/$/'
+
+  singleton_mutations
+  regexp_mutations
+
+  mutation '/\z/'
+end
diff --git a/meta/regexp/regexp_eos_anchor.rb b/meta/regexp/regexp_eos_anchor.rb
new file mode 100644
index 00000000..f70a8278
--- /dev/null
+++ b/meta/regexp/regexp_eos_anchor.rb
@@ -0,0 +1,6 @@
+Mutant::Meta::Example.add :regexp_eos_anchor do
+  source '/\z/'
+
+  singleton_mutations
+  regexp_mutations
+end