grammar: add support for escape sequenes in single, double and unquoted strings

CHANGELOG.md

@@ -6,6 +6,7 @@ NEW FEATURES:
 
 - Support folding markers for directives like `<source>...</source>`
 - Support toggling comments
+- Support escape sequenes like `foo\nbar` in single, double and unquoted strings
 
 IMPROVEMENTS:
 

grammars/fluentd.cson

@@ -77,6 +77,10 @@ repository:
     ]
   values:
     patterns: [
+      {
+        match: '\\\\.'
+        name: 'value.string.escape.fluentd'
+      }
       {
         begin: '(")'
         beginCaptures:
@@ -87,6 +91,9 @@ repository:
           '1':
             name: 'punctuation.definition.string.end.fluentd'
         name: 'meta.value.string.quoted.double.fluentd'
+        patterns: [
+          {include: '#stringescapes'}
+        ]
       }
       {
         begin: "(')"
@@ -98,6 +105,9 @@ repository:
           '1':
             name: 'punctuation.definition.string.end.fluentd'
         name: 'meta.value.string.quoted.single.fluentd'
+        patterns: [
+          {include: '#stringescapes'}
+        ]
       }
       {
         match: '([^\\s]+?)'
@@ -107,3 +117,10 @@ repository:
             name: 'string.unquoted.fluentd'
       }
     ]
+  stringescapes:
+    patterns: [
+      {
+        match: '\\\\.'
+        name: 'constant.string.escape.fluentd'
+      }
+    ]