Add maxStrinLength argument to debugger requests

test/mjsunit/debug-evaluate.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 69 matching lines @@
       testRequest(dcp, '{"expression":"({\\"a\\":1,\\"b\\":2}).b+2"}', true, 4);
 
       // Test evaluation of a in the stack frames and the global context.
       testRequest(dcp, '{"expression":"a"}', true, 3);
       testRequest(dcp, '{"expression":"a","frame":0}', true, 3);
       testRequest(dcp, '{"expression":"a","frame":1}', true, 2);
       testRequest(dcp, '{"expression":"a","frame":2}', true, 1);
       testRequest(dcp, '{"expression":"a","global":true}', true, 1);
       testRequest(dcp, '{"expression":"this.a","global":true}', true, 1);
 
+      // Test that the whole string text is returned if maxStringLength
+      // parameter is passed.
+      testRequest(
+          dcp,
+          '{"expression":"this.longString","global":true,maxStringLength:-1}',
+          true,
+          longString);
+      testRequest(
+          dcp,
+          '{"expression":"this.longString","global":true,maxStringLength:' +
+              longString.length + '}',
+          true,
+          longString);
+      var truncatedStringSuffix = '... (length: ' + longString.length + ')';
+      testRequest(
+          dcp,
+          '{"expression":"this.longString","global":true,maxStringLength:0}',
+          true,
+          truncatedStringSuffix);
+      testRequest(
+          dcp,
+          '{"expression":"this.longString","global":true,maxStringLength:1}',
+          true,
+          longString.charAt(0) + truncatedStringSuffix);
+      // Test that by default string is truncated to first 80 chars.
+      testRequest(
+          dcp,
+          '{"expression":"this.longString","global":true}',
+          true,
+          longString.substring(0, 80) + truncatedStringSuffix);
+
       // Indicate that all was processed.
       listenerComplete = true;
     }
   } catch (e) {
    exception = e
   };
 };
 
 // Add the debug event listener.
 Debug.setListener(listener);
 
 function f() {
   var a = 3;
 };
 
 function g() {
   var a = 2;
   f();
 };
 
 a = 1;
 
+// String which is longer than 80 chars.
+var longString = "1234567890_";
+for (var i = 0; i < 4; i++) {
+  longString += longString;
+}
+
 // Set a break point at return in f and invoke g to hit the breakpoint.
 Debug.setBreakPoint(f, 2, 0);
 g();
 
 assertFalse(exception, "exception in listener")
 // Make sure that the debug event listener vas invoked.
 assertTrue(listenerComplete, "listener did not run to completion");