flutter_flutter/framework/inspector/runtime-agent.sky

<import src="debug.sky" as="debug" />
<script>
class Runtime {
  constructor(delegate) {
    this.delegate_ = delegate;
    Object.preventExtensions(this);
  }

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

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

    return makeResult(params, value, wasThrown);
  }

  getProperties(params) {
    var properties = injectedScript.getProperties(params.objectId, !!params.ownProperties, !!params.accessorPropertiesOnly);
    var result = {
      result: properties
    };
    if (!params.accessorPropertiesOnly) {
      result.internalProperties = injectedScript.getInternalProperties(params.objectId);
    }
    return result;
  }
}

// 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.loggingStub("releaseObjectGroup");

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

class RemoteObjectRegistery {
  constructor() {
    this.lastObjectId = 0;
    this.objectsById = [];
    Object.preventExtensions(this);
  }

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

  lookup(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;
}

module.exports = Runtime;
</script>