Add support for missing YASnippet escape sequences

Author: Alhadis

CHANGELOG.md

@@ -6,6 +6,12 @@ This project adheres to [Semantic Versioning](http://semver.org).
 [Unpublished]: ../../compare/v1.4.1...HEAD
 
 
+[Unpublished]
+------------------------------------------------------------------------
+* __Fixed:__ Escaped brackets and quotes not recognised in YASnippets
+
+
+
 [v1.4.1]
 ------------------------------------------------------------------------
 **August 4th, 2021**  

grammars/yasnippet.cson

@@ -163,6 +163,7 @@ repository:
 		captures:
 			1: name: "punctuation.definition.variable.sigil.dollar-sign.yasnippet"
 
+	# NOTE: This list should be kept in sync with `yas--escaped-characters`
 	"escaped-characters":
 		patterns: [{
 			# Escaped backslash
@@ -182,6 +183,30 @@ repository:
 			match: "(\\\\)`"
 			captures:
 				1: name: "punctuation.definition.escape.yasnippet"
+		},{
+			# \'
+			name: "constant.character.escape.quote.single.yasnippet"
+			match: "(\\\\)'"
+			captures:
+				1: name: "punctuation.definition.escape.yasnippet"
+		},{
+			# \"
+			name: "constant.character.escape.quote.double.yasnippet"
+			match: '(\\\\)"'
+			captures:
+				1: name: "punctuation.definition.escape.yasnippet"
+		},{
+			# \{ \}
+			name: "constant.character.escape.bracket.curly.brace.yasnippet"
+			match: "(\\\\)[{}]"
+			captures:
+				1: name: "punctuation.definition.escape.yasnippet"
+		},{
+			# \( \)
+			name: "constant.character.escape.bracket.round.parenthesis.yasnippet"
+			match: "(\\\\)[\\(\\)]"
+			captures:
+				1: name: "punctuation.definition.escape.yasnippet"
 		}]
 
 	"embedded-lisp":