Scope invalid escape sequences in double quoted yaml strings

Resolves #415

Author: deathaxe

Package/Sublime Text Syntax Definition/Sublime Text Syntax Definition.sublime-syntax

@@ -602,11 +602,10 @@ contexts:
       scope: punctuation.definition.string.begin.yaml
       push:
         - meta_scope: comment.other.quoted.double.sublime-syntax
-        - match: \\.
-          scope: constant.character.escape.yaml
         - match: '"'
           scope: punctuation.definition.string.end.yaml
           pop: true
+        - include: yaml-double-quoted-escapes
 
     - match: "'"
       scope: punctuation.definition.string.begin.yaml
@@ -660,12 +659,11 @@ contexts:
       push:
         - meta_scope: string.quoted.double.yaml
         - meta_content_scope: source.regexp.oniguruma
-        - include: regexp_variable
-        - match: \\.
-          scope: constant.character.escape.yaml
         - match: '"'
           scope: punctuation.definition.string.end.yaml
           pop: 2
+        - include: yaml-double-quoted-escapes
+        - include: regexp_variable
 
     - match: "'"
       scope: punctuation.definition.string.begin.yaml
@@ -794,3 +792,15 @@ contexts:
 
   yaml-tags-anchors:
     - include: YAML.sublime-syntax#property
+
+  yaml-double-quoted-escapes:
+    - match: \\[ 0_abefLnNPprtv/\\"]
+      scope: constant.character.escape.yaml
+    - match: \\x\h{2}
+      scope: constant.character.escape.unicode.8bit.yaml
+    - match: \\u\h{4}
+      scope: constant.character.escape.unicode.16bit.yaml
+    - match: \\U\h{8}
+      scope: constant.character.escape.unicode.32bit.yaml
+    - match: \\.
+      scope: invalid.illegal.escape.yaml

Package/Sublime Text Syntax Definition/syntax_test_sublime-syntax.yaml

@@ -252,11 +252,13 @@ contexts:
     - comment: "this is a \"comment"
 #              ^^^^^^^^^^^^^^^^^^^^^ comment.other.quoted.double.sublime-syntax
 #              ^ punctuation.definition.string.begin.yaml
+#                         ^^ constant.character.escape.yaml
 #                                  ^ punctuation.definition.string.end.yaml
 
       comment: 'this is a ''comment'
 #              ^^^^^^^^^^^^^^^^^^^^^ comment.other.quoted.single.sublime-syntax
 #              ^ punctuation.definition.string.begin.yaml
+#                         ^^ constant.character.escape.yaml
 #                                  ^ punctuation.definition.string.end.yaml
 
     - comment: |-
@@ -288,6 +290,61 @@ contexts:
       (?x) # extended group with comments
 #     ^^^^ source.regexp.oniguruma meta.group.extended.regexp
 #          ^ source.regexp.oniguruma comment.line.number-sign.regexp punctuation.definition.comment.regexp
+
+    - match: "(?=\0)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\a)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\b)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\t)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\n)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\v)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\f)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\r)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\e)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\ )"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\")"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\/)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\\)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\N)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\_)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\L)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\P)"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\ )"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\ )"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\ )"
+#                ^^ constant.character.escape.yaml
+    - match: "(?=\')"
+#                ^^ invalid.illegal.escape.yaml
+    - match: "(?=\m)"
+#                ^^ invalid.illegal.escape.yaml
+    - match: "(?=\x1234)"
+#                ^^^^ constant.character.escape.unicode.8bit.yaml
+#                    ^^ - constant.character.escape
+    - match: "(?=\u123fd)"
+#                ^^^^^^ constant.character.escape.unicode.16bit.yaml
+#                      ^ - constant.character.escape
+    - match: "(?=\U123fda3f2)"
+#                ^^^^^^^^^^ constant.character.escape.unicode.32bit.yaml
+#                          ^ - constant.character.escape
+
     - scope: abc
 #     ^^^^^ string.unquoted.plain.out.yaml storage.type.scope-name.sublime-syntax
     - meta_scope: abc