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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";
module.metadata = {
"stability": "experimental"
};
const { Ci, components } = require("chrome");
const { parseStack, sourceURI } = require("toolkit/loader");
const { readURISync } = require("../net/url");
function safeGetFileLine(path, line) {
try {
var scheme = require("../url").URL(path).scheme;
// TODO: There should be an easier, more accurate way to figure out
// what's the case here.
if (!(scheme == "http" || scheme == "https"))
return readURISync(path).split("\n")[line - 1];
} catch (e) {}
return null;
}
function nsIStackFramesToJSON(frame) {
var stack = [];
while (frame) {
if (frame.filename) {
stack.unshift({
fileName: sourceURI(frame.filename),
lineNumber: frame.lineNumber,
name: frame.name
});
}
frame = frame.caller;
}
return stack;
};
var fromException = exports.fromException = function fromException(e) {
if (e instanceof Ci.nsIException)
return nsIStackFramesToJSON(e.location);
if (e.stack && e.stack.length)
return parseStack(e.stack);
if (e.fileName && typeof(e.lineNumber == "number"))
return [{fileName: sourceURI(e.fileName),
lineNumber: e.lineNumber,
name: null}];
return [];
};
var get = exports.get = function get() {
return nsIStackFramesToJSON(components.stack.caller);
};
var format = exports.format = function format(tbOrException) {
if (tbOrException === undefined) {
tbOrException = get();
tbOrException.pop();
}
var tb;
if (typeof(tbOrException) == "object" &&
tbOrException.constructor.name == "Array")
tb = tbOrException;
else
tb = fromException(tbOrException);
var lines = ["Traceback (most recent call last):"];
tb.forEach(
function(frame) {
if (!(frame.fileName || frame.lineNumber || frame.name))
return;
lines.push(' File "' + frame.fileName + '", line ' +
frame.lineNumber + ', in ' + frame.name);
var sourceLine = safeGetFileLine(frame.fileName, frame.lineNumber);
if (sourceLine)
lines.push(' ' + sourceLine.trim());
});
return lines.join("\n");
};
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