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sdk/lib/_internal/compiler/implementation/string_validator.dart

 // Copyright (c) 2012, 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.
 
 // Check the validity of string literals.
 
 library stringvalidator;
 
 import "dart:collection";
 
@@ skipping 63 matching lines @@
             quoteLength += 1;
           }
         } else if (code == $LF) {
           quoteLength += 1;
         }
       }
     }
     return StringQuoting.getQuoting(quoteChar, raw, quoteLength);
   }
 
+  /**
+   * Return the string [string] witout its [initial] first and [terminal] last
+   * characters. This is intended to be used to remove quotes from string
+   * literals (including an initial 'r' for raw strings).
+   */
+  String copyWithoutQuotes(String string, int initial, int terminal) {
+    assert(0 <= initial);
+    assert(0 <= terminal);
+    assert(initial + terminal <= string.length);
+    return string.substring(initial, string.length - terminal);
+  }
+
   void stringParseError(String message, Token token, int offset) {
     listener.cancel("$message @ $offset", token : token);
   }
 
   /**
    * Validates the escape sequences and special characters of a string literal.
    * Returns a DartString if valid, and null if not.
    */
   DartString validateString(Token token,
                             int startOffset,
@@ skipping 111 matching lines @@
       return null;
     }
     // String literal successfully validated.
     if (quoting.raw || !containsEscape) {
       // A string without escapes could just as well have been raw.
       return new DartString.rawString(string, length);
     }
     return new DartString.escapedString(string, length);
   }
 }