Fix interpretation of string contents after interpolation expressions.

pkg/analyzer/lib/src/generated/ast.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.ast;
 
 import 'dart:collection';
@@ skipping 16685 matching lines @@
   final bool isFirst;
   final bool isLast;
 
   bool isRaw = false;
   bool isSingleQuoted = false;
   bool isMultiline = false;
   int start = 0;
   int end;
 
   StringLexemeHelper(this.lexeme, this.isFirst, this.isLast) {
-    isRaw = StringUtilities.startsWithChar(lexeme, 0x72);
-    if (isRaw) {
-      start++;
-    }
-    if (StringUtilities.startsWith3(lexeme, start, 0x27, 0x27, 0x27)) {
-      isSingleQuoted = true;
-      isMultiline = true;
-      start += 3;
-      start = _trimInitialWhitespace(start);
-    } else if (StringUtilities.startsWith3(lexeme, start, 0x22, 0x22, 0x22)) {
-      isSingleQuoted = false;
-      isMultiline = true;
-      start += 3;
-      start = _trimInitialWhitespace(start);
-    } else if (start < lexeme.length && lexeme.codeUnitAt(start) == 0x27) {
-      isSingleQuoted = true;
-      isMultiline = false;
-      start++;
-    } else if (start < lexeme.length && lexeme.codeUnitAt(start) == 0x22) {
-      isSingleQuoted = false;
-      isMultiline = false;
-      start++;
+    if (isFirst) {
+      isRaw = StringUtilities.startsWithChar(lexeme, 0x72);
+      if (isRaw) {
+        start++;
+      }
+      if (StringUtilities.startsWith3(lexeme, start, 0x27, 0x27, 0x27)) {
+        isSingleQuoted = true;
+        isMultiline = true;
+        start += 3;
+        start = _trimInitialWhitespace(start);
+      } else if (StringUtilities.startsWith3(lexeme, start, 0x22, 0x22, 0x22)) {
+        isSingleQuoted = false;
+        isMultiline = true;
+        start += 3;
+        start = _trimInitialWhitespace(start);
+      } else if (start < lexeme.length && lexeme.codeUnitAt(start) == 0x27) {
+        isSingleQuoted = true;
+        isMultiline = false;
+        start++;
+      } else if (start < lexeme.length && lexeme.codeUnitAt(start) == 0x22) {
+        isSingleQuoted = false;
+        isMultiline = false;
+        start++;
+      }
     }
     end = lexeme.length;
     if (isLast) {
       if (StringUtilities.endsWith3(lexeme, 0x22, 0x22, 0x22) ||
           StringUtilities.endsWith3(lexeme, 0x27, 0x27, 0x27)) {
         end -= 3;
       } else if (StringUtilities.endsWithChar(lexeme, 0x22) ||
           StringUtilities.endsWithChar(lexeme, 0x27)) {
         end -= 1;
       }
@@ skipping 3407 matching lines @@
   }
 
   @override
   accept(AstVisitor visitor) => visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     _safelyVisitChild(_expression, visitor);
   }
 }