match newer grammar naming

Author: Aerijo

lib/snippet-body-old.pegjs

@@ -37,11 +37,11 @@ tabStopWithoutPlaceholder = '${' index:[0-9]+ '}' {
 tabStopWithPlaceholder = '${' index:[0-9]+ ':' content:placeholderContent '}' {
   return { index: parseInt(index.join("")), content: content };
 }
-tabStopWithTransformation = '${' index:[0-9]+ substitution:transformationSubstitution '}' {
+tabStopWithTransformation = '${' index:[0-9]+ transformation:transformationSubstitution '}' {
   return {
     index: parseInt(index.join(""), 10),
     content: [],
-    substitution: substitution
+    transformation,
   };
 }
 
@@ -71,12 +71,12 @@ transformationSubstitution = '/' find:(escapedForwardSlash / [^/])* '/' replace:
 formatString = content:(formatStringEscape / formatStringReference / escapedForwardSlash / [^/])+ {
   return content;
 }
-// Backreferencing a substitution. Different from a tab stop.
+// Backreferencing a transformation capture group. Different from a tab stop.
 formatStringReference = '$' digits:[0-9]+ {
   return { backreference: parseInt(digits.join(''), 10) };
 };
 // One of the special control flags in a format string for case folding and
 // other tasks.
 formatStringEscape = '\\' flag:[ULulErn$] {
-  return { escape: flag };
+  return { modifier: flag };
 }