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Diffstat (limited to 'tools/addon-sdk-1.3/packages/api-utils/lib/traceback.js')
-rw-r--r-- | tools/addon-sdk-1.3/packages/api-utils/lib/traceback.js | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/traceback.js b/tools/addon-sdk-1.3/packages/api-utils/lib/traceback.js new file mode 100644 index 0000000..fdedd99 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/traceback.js @@ -0,0 +1,155 @@ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is Mozilla. + * Portions created by the Initial Developer are Copyright (C) 2007 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Atul Varma <atul@mozilla.com> + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +"use strict"; + +const {Cc,Ci,components} = require("chrome"); + +// Undo the auto-parentification of URLs done in bug 418356. +function deParentifyURL(url) { + return url ? url.split(" -> ").slice(-1)[0] : url; +} + +// TODO: We might want to move this function to url or some similar +// module. +function getLocalFile(path) { + var ios = Cc['@mozilla.org/network/io-service;1'] + .getService(Ci.nsIIOService); + var channel = ios.newChannel(path, null, null); + var iStream = channel.open(); + var siStream = Cc['@mozilla.org/scriptableinputstream;1'] + .createInstance(Ci.nsIScriptableInputStream); + siStream.init(iStream); + var data = new String(); + data += siStream.read(-1); + siStream.close(); + iStream.close(); + return data; +} + +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 getLocalFile(path).split("\n")[line - 1]; + } catch (e) {} + return null; +} + +function errorStackToJSON(stack) { + var lines = stack.split("\n"); + + var frames = []; + lines.forEach( + function(line) { + if (!line) + return; + var atIndex = line.indexOf("@"); + var colonIndex = line.lastIndexOf(":"); + var filename = deParentifyURL(line.slice(atIndex + 1, colonIndex)); + var lineNo = parseInt(line.slice(colonIndex + 1)); + var funcSig = line.slice(0, atIndex); + var funcName = funcSig.slice(0, funcSig.indexOf("(")); + frames.unshift({filename: filename, + funcName: funcName, + lineNo: lineNo}); + }); + + return frames; +}; + +function nsIStackFramesToJSON(frame) { + var stack = []; + + while (frame) { + if (frame.filename) { + var filename = deParentifyURL(frame.filename); + stack.splice(0, 0, {filename: filename, + lineNo: frame.lineNumber, + funcName: 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 errorStackToJSON(e.stack); + if (e.fileName && typeof(e.lineNumber == "number")) + return [{filename: deParentifyURL(e.fileName), + lineNo: e.lineNumber, + funcName: 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.splice(-1, 1); + } + + 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.lineNo || frame.funcName)) + return; + lines.push(' File "' + frame.filename + '", line ' + + frame.lineNo + ', in ' + frame.funcName); + var sourceLine = safeGetFileLine(frame.filename, frame.lineNo); + if (sourceLine) + lines.push(' ' + sourceLine.trim()); + }); + + return lines.join("\n"); +}; |