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Issue 1543803002: Revert of [proxies] Better print for proxies in d8 (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 12 months ago
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1 // Copyright 2008 the V8 project authors. All rights reserved. 1 // Copyright 2008 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 "use strict"; 5 "use strict";
6 6
7 // A more universal stringify that supports more types than JSON. 7 // A more universal stringify that supports more types than JSON.
8 // Used by the d8 shell to output results. 8 // Used by the d8 shell to output results.
9 var stringifyDepthLimit = 4; // To avoid crashing on cyclic objects 9 var stringifyDepthLimit = 4; // To avoid crashing on cyclic objects
10 10
11 function Stringify(x, depth) { 11 function Stringify(x, depth) {
12 if (depth === undefined) 12 if (depth === undefined)
13 depth = stringifyDepthLimit; 13 depth = stringifyDepthLimit;
14 else if (depth === 0) 14 else if (depth === 0)
15 return "*"; 15 return "*";
16 if (IS_PROXY(x)) {
17 return StringifyProxy(x, depth);
18 }
19 switch (typeof x) { 16 switch (typeof x) {
20 case "undefined": 17 case "undefined":
21 return "undefined"; 18 return "undefined";
22 case "boolean": 19 case "boolean":
23 case "number": 20 case "number":
24 case "function": 21 case "function":
25 return x.toString(); 22 return x.toString();
26 case "string": 23 case "string":
27 return "\"" + x.toString() + "\""; 24 return "\"" + x.toString() + "\"";
28 case "symbol": 25 case "symbol":
29 return x.toString(); 26 return x.toString();
30 case "object": 27 case "object":
31 if (IS_NULL(x)) return "null"; 28 if (IS_NULL(x)) return "null";
29 if (x.constructor && x.constructor.name === "Array") {
30 var elems = [];
31 for (var i = 0; i < x.length; ++i) {
32 elems.push(
33 {}.hasOwnProperty.call(x, i) ? Stringify(x[i], depth - 1) : "");
34 }
35 return "[" + elems.join(", ") + "]";
36 }
32 try { 37 try {
33 return StringifyObject(x, depth); 38 var string = String(x);
34 } catch(RangeError) { 39 if (string && string !== "[object Object]") return string;
35 return "{*}" 40 } catch(e) {}
41 var props = [];
42 var names = Object.getOwnPropertyNames(x);
43 names = names.concat(Object.getOwnPropertySymbols(x));
44 for (var i in names) {
45 var name = names[i];
46 var desc = Object.getOwnPropertyDescriptor(x, name);
47 if (IS_UNDEFINED(desc)) continue;
48 if (IS_SYMBOL(name)) name = "[" + Stringify(name) + "]";
49 if ("value" in desc) {
50 props.push(name + ": " + Stringify(desc.value, depth - 1));
51 }
52 if (desc.get) {
53 var getter = Stringify(desc.get);
54 props.push("get " + name + getter.slice(getter.indexOf('(')));
55 }
56 if (desc.set) {
57 var setter = Stringify(desc.set);
58 props.push("set " + name + setter.slice(setter.indexOf('(')));
59 }
36 } 60 }
61 return "{" + props.join(", ") + "}";
37 default: 62 default:
38 return "[crazy non-standard value]"; 63 return "[crazy non-standard value]";
39 } 64 }
40 } 65 }
41
42 function StringifyObject(x, depth) {
43 if (x.constructor && x.constructor.name === "Array") {
44 var elems = [];
45 for (var i = 0; i < x.length; ++i) {
46 elems.push(
47 {}.hasOwnProperty.call(x, i) ? Stringify(x[i], depth - 1) : "");
48 }
49 return "[" + elems.join(", ") + "]";
50 }
51 try {
52 var string = String(x);
53 if (string && string !== "[object Object]") return string;
54 } catch(e) {}
55 var props = [];
56 var names = Object.getOwnPropertyNames(x);
57 names = names.concat(Object.getOwnPropertySymbols(x));
58 for (var i in names) {
59 var name = names[i];
60 var desc = Object.getOwnPropertyDescriptor(x, name);
61 if (IS_UNDEFINED(desc)) continue;
62 if (IS_SYMBOL(name)) name = "[" + Stringify(name) + "]";
63 if ("value" in desc) {
64 props.push(name + ": " + Stringify(desc.value, depth - 1));
65 }
66 if (desc.get) {
67 var getter = Stringify(desc.get);
68 props.push("get " + name + getter.slice(getter.indexOf('(')));
69 }
70 if (desc.set) {
71 var setter = Stringify(desc.set);
72 props.push("set " + name + setter.slice(setter.indexOf('(')));
73 }
74 }
75 return "{" + props.join(", ") + "}";
76 }
77
78 function StringifyProxy(proxy, depth) {
79 var proxy_type = typeof proxy;
80 return '[' + proxy_type + ' Proxy ' + Stringify({
81 target: %JSProxyGetTarget(proxy),
82 handler: %JSProxyGetHandler(proxy)
83 }, depth-1) + ']';
84 }
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