flutter_flutter/framework/inspector/runtime-agent.sky

<script>

function Runtime(delegate) {
  this.delegate_ = delegate;
}

// FIXME: Move these to their own 'debug' module.
function logParams(name, params) {
  console.log(name + "(" + JSON.stringify(params, null, " ") + ")")
}

function debug(name) {
  return function(params) {
    logParams(name, params);
  }
}

Runtime.prototype.enable = function() {
  this.delegate_.sendMessage("Runtime.executionContextCreated", {
    "context": {
      "frameId": 1,
      "id": 1,
    }
  });
  return {
    result: true,
  };
};

Runtime.prototype.callFunctionOn = function(params) {
  logParams("callFunctionOn", params);
  var object = g_objectRegistry.lookup(params.objectId);
  // This is a horrible hack:
  var functionName = params.functionDeclaration.match(/^function (\w+)\(/)[1];
  var expression = params.functionDeclaration + "; return " + functionName + ";";
  var wasThrown = false;
  var value;
  try {
    var func = new Function('', expression)();
    value = func(object);
  } catch (e) {
    value = e;
    wasThrown = true;
  }

  return makeResult(params, value, wasThrown);
}

// FIXME: This should release all objects associated with an object
// group, see InjectedScriptSource.js for an example.  Just have to
// track which object ids are associated with which object groups first.
Runtime.prototype.releaseObjectGroup = debug("releaseObjectGroup");

// See InjectedScript._bind for a fancier version of this:

function RemoteObjectRegistery() {
  this.lastObjectId = 0;
  this.objectsById = [];
}

RemoteObjectRegistery.prototype.register = function(object) {
  var objectId = ++this.lastObjectId;
  this.objectsById[objectId] = object;
  return String(objectId);
}

RemoteObjectRegistery.prototype.lookup = function(objectId) {
  return this.objectsById[Number(objectId)];
}

var g_objectRegistry = new RemoteObjectRegistery();


function makeResult(params, value, wasThrown) {
  var type = typeof(value)
  var result = {
    "result": {
      "type": type,
    },
    "wasThrown": wasThrown,
  };

  // Unclear why this often fails with:
  // "TypeError: Cannot convert object to primitive value"
  try {
    result['result']['description'] = String(value);
  } catch (e) {}

  if (type == "object") {
    result["result"]["objectId"] = g_objectRegistry.register(value);
  }

  if (params.returnByValue) {
    result["result"]["value"] = value;
  }

  if (wasThrown) {
    // If we don"t have exceptionDetails, inspector hits an exception.
    result["exceptionDetails"] = {
      "text": value.message,
      "url": "",
      "line": 0,
      "column": 0,
      "stackTrace": [{
        "functionName": "",
        "scriptId": "1",
        "url": "",
        "lineNumber": 0,
        "columnNumber": 0
      }]
    }
  }
  return result;
}

// FIXME: See Blink"s inspected-script-source.js InjectedScript.RemoteObject.
Runtime.prototype.evaluate = function(params) {
  logParams("evaluate", params);
  var wasThrown = false;
  var value;
  try {
    value = eval(params.expression);
  } catch (e) {
    value = e;
    wasThrown = true;
  }

  return makeResult(params, value, wasThrown);
}

Runtime.prototype.getProperties = debug("getProperties");

this.exports = Runtime;
</script>