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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const DevToolsUtils = require("devtools/shared/DevToolsUtils");
loader.lazyRequireGetter(
this,
"ObjectUtils",
"devtools/server/actors/object/utils"
);
/**
* Stringify a Debugger.Object based on its class.
*
* @param Debugger.Object obj
* The object to stringify.
* @return String
* The stringification for the object.
*/
function stringify(obj) {
if (!DevToolsUtils.isSafeDebuggerObject(obj)) {
const unwrapped = DevToolsUtils.unwrap(obj);
if (unwrapped === undefined) {
return "<invisibleToDebugger>";
} else if (unwrapped.isProxy) {
return "<proxy>";
}
// The following line should not be reached. It's there just in case somebody
// modifies isSafeDebuggerObject to return false for additional kinds of objects.
return "[object " + obj.class + "]";
} else if (obj.class == "DeadObject") {
return "<dead object>";
}
const stringifier = stringifiers[obj.class] || stringifiers.Object;
try {
return stringifier(obj);
} catch (e) {
DevToolsUtils.reportException("stringify", e);
return "<failed to stringify object>";
}
}
/**
* Create a function that can safely stringify Debugger.Objects of a given
* builtin type.
*
* @param Function ctor
* The builtin class constructor.
* @return Function
* The stringifier for the class.
*/
function createBuiltinStringifier(ctor) {
return obj => {
try {
return ctor.prototype.toString.call(obj.unsafeDereference());
} catch (err) {
// The debuggee will see a "Function" class if the object is callable and
// its compartment is not subsumed. The above will throw if it's not really
// a function, e.g. if it's a callable proxy.
return "[object " + obj.class + "]";
}
};
}
/**
* Stringify a Debugger.Object-wrapped Error instance.
*
* @param Debugger.Object obj
* The object to stringify.
* @return String
* The stringification of the object.
*/
function errorStringify(obj) {
let name = DevToolsUtils.getProperty(obj, "name");
if (name === "" || name === undefined) {
name = obj.class;
} else if (isObject(name)) {
name = stringify(name);
}
let message = DevToolsUtils.getProperty(obj, "message");
if (isObject(message)) {
message = stringify(message);
}
if (message === "" || message === undefined) {
return name;
}
return name + ": " + message;
}
// Used to prevent infinite recursion when an array is found inside itself.
var seen = null;
var stringifiers = {
Error: errorStringify,
EvalError: errorStringify,
RangeError: errorStringify,
ReferenceError: errorStringify,
SyntaxError: errorStringify,
TypeError: errorStringify,
URIError: errorStringify,
Boolean: createBuiltinStringifier(Boolean),
Function: createBuiltinStringifier(Function),
Number: createBuiltinStringifier(Number),
RegExp: createBuiltinStringifier(RegExp),
String: createBuiltinStringifier(String),
Object: obj => "[object " + obj.class + "]",
Array: obj => {
// If we're at the top level then we need to create the Set for tracking
// previously stringified arrays.
const topLevel = !seen;
if (topLevel) {
seen = new Set();
} else if (seen.has(obj)) {
return "";
}
seen.add(obj);
const len = ObjectUtils.getArrayLength(obj);
let string = "";
// Array.length is always a non-negative safe integer.
for (let i = 0; i < len; i++) {
const desc = obj.getOwnPropertyDescriptor(i);
if (desc) {
const { value } = desc;
if (value != null) {
string += isObject(value) ? stringify(value) : value;
}
}
if (i < len - 1) {
string += ",";
}
}
if (topLevel) {
seen = null;
}
return string;
},
DOMException: obj => {
const message = DevToolsUtils.getProperty(obj, "message") || "<no message>";
const result = (+DevToolsUtils.getProperty(obj, "result")).toString(16);
const code = DevToolsUtils.getProperty(obj, "code");
const name = DevToolsUtils.getProperty(obj, "name") || "<unknown>";
return (
'[Exception... "' +
message +
'" ' +
'code: "' +
code +
'" ' +
'nsresult: "0x' +
result +
" (" +
name +
')"]'
);
},
Promise: obj => {
const { state, value, reason } = ObjectUtils.getPromiseState(obj);
let statePreview = state;
if (state != "pending") {
const settledValue = state === "fulfilled" ? value : reason;
statePreview +=
": " +
(typeof settledValue === "object" && settledValue !== null
? stringify(settledValue)
: settledValue);
}
return "Promise (" + statePreview + ")";
},
};
/**
* Determine if a given value is non-primitive.
*
* @param Any value
* The value to test.
* @return Boolean
* Whether the value is non-primitive.
*/
function isObject(value) {
const type = typeof value;
return type == "object" ? value !== null : type == "function";
}
module.exports = stringify;
|
