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module.exports = StackUtils;
function StackUtils(opts) {
if (!(this instanceof StackUtils)) {
throw new Error('StackUtils constructor must be called with new');
}
opts = opts || {};
this._cwd = (opts.cwd || process.cwd()).replace(/\\/g, '/');
this._internals = opts.internals || [];
this._wrapCallSite = opts.wrapCallSite || false;
}
module.exports.nodeInternals = nodeInternals;
function nodeInternals() {
if (!module.exports.natives) {
module.exports.natives = Object.keys(process.binding('natives'));
module.exports.natives.push('bootstrap_node', 'node');
}
return module.exports.natives.map(function (n) {
return new RegExp('\\(' + n + '\\.js:\\d+:\\d+\\)$');
}).concat([
/\s*at (bootstrap_)?node\.js:\d+:\d+?$/,
/\/\.node-spawn-wrap-\w+-\w+\/node:\d+:\d+\)?$/
]);
}
StackUtils.prototype.clean = function (stack) {
if (!Array.isArray(stack)) {
stack = stack.split('\n');
}
if (!(/^\s*at /.test(stack[0])) &&
(/^\s*at /.test(stack[1]))) {
stack = stack.slice(1);
}
var outdent = false;
var lastNonAtLine = null;
var result = [];
stack.forEach(function (st) {
st = st.replace(/\\/g, '/');
var isInternal = this._internals.some(function (internal) {
return internal.test(st);
});
if (isInternal) {
return null;
}
var isAtLine = /^\s*at /.test(st);
if (outdent) {
st = st.replace(/\s+$/, '').replace(/^(\s+)at /, '$1');
} else {
st = st.trim();
if (isAtLine) {
st = st.substring(3);
}
}
st = st.replace(this._cwd + '/', '');
if (st) {
if (isAtLine) {
if (lastNonAtLine) {
result.push(lastNonAtLine);
lastNonAtLine = null;
}
result.push(st);
} else {
outdent = true;
lastNonAtLine = st;
}
}
}, this);
stack = result.join('\n').trim();
if (stack) {
return stack + '\n';
}
return '';
};
StackUtils.prototype.captureString = function (limit, fn) {
if (typeof limit === 'function') {
fn = limit;
limit = Infinity;
}
if (!fn) {
fn = this.captureString;
}
var limitBefore = Error.stackTraceLimit;
if (limit) {
Error.stackTraceLimit = limit;
}
var obj = {};
Error.captureStackTrace(obj, fn);
var stack = obj.stack;
Error.stackTraceLimit = limitBefore;
return this.clean(stack);
};
StackUtils.prototype.capture = function (limit, fn) {
if (typeof limit === 'function') {
fn = limit;
limit = Infinity;
}
if (!fn) {
fn = this.capture;
}
var prepBefore = Error.prepareStackTrace;
var limitBefore = Error.stackTraceLimit;
var wrapCallSite = this._wrapCallSite;
Error.prepareStackTrace = function (obj, site) {
if (wrapCallSite) {
return site.map(wrapCallSite);
}
return site;
};
if (limit) {
Error.stackTraceLimit = limit;
}
var obj = {};
Error.captureStackTrace(obj, fn);
var stack = obj.stack;
Error.prepareStackTrace = prepBefore;
Error.stackTraceLimit = limitBefore;
return stack;
};
StackUtils.prototype.at = function at(fn) {
if (!fn) {
fn = at;
}
var site = this.capture(1, fn)[0];
if (!site) {
return {};
}
var res = {
line: site.getLineNumber(),
column: site.getColumnNumber()
};
this._setFile(res, site.getFileName());
if (site.isConstructor()) {
res.constructor = true;
}
if (site.isEval()) {
res.evalOrigin = site.getEvalOrigin();
}
if (site.isNative()) {
res.native = true;
}
var typename = null;
try {
typename = site.getTypeName();
} catch (er) {}
if (typename &&
typename !== 'Object' &&
typename !== '[object Object]') {
res.type = typename;
}
var fname = site.getFunctionName();
if (fname) {
res.function = fname;
}
var meth = site.getMethodName();
if (meth && fname !== meth) {
res.method = meth;
}
return res;
};
StackUtils.prototype._setFile = function (result, filename) {
if (filename) {
filename = filename.replace(/\\/g, '/');
if ((filename.indexOf(this._cwd + '/') === 0)) {
filename = filename.substr(this._cwd.length + 1);
}
result.file = filename;
}
};
var re = new RegExp(
'^' +
// Sometimes we strip out the ' at' because it's noisy
'(?:\\s*at )?' +
// $1 = ctor if 'new'
'(?:(new) )?' +
// $2 = function name (can be literally anything)
// May contain method at the end as [as xyz]
'(?:(.*?) \\()?' +
// (eval at <anonymous> (file.js:1:1),
// $3 = eval origin
// $4:$5:$6 are eval file/line/col, but not normally reported
'(?:eval at ([^ ]+) \\((.+?):(\\d+):(\\d+)\\), )?' +
// file:line:col
// $7:$8:$9
// $10 = 'native' if native
'(?:(.+?):(\\d+):(\\d+)|(native))' +
// maybe close the paren, then end
// if $11 is ), then we only allow balanced parens in the filename
// any imbalance is placed on the fname. This is a heuristic, and
// bound to be incorrect in some edge cases. The bet is that
// having weird characters in method names is more common than
// having weird characters in filenames, which seems reasonable.
'(\\)?)$'
);
var methodRe = /^(.*?) \[as (.*?)\]$/;
StackUtils.prototype.parseLine = function parseLine(line) {
var match = line && line.match(re);
if (!match) {
return null;
}
var ctor = match[1] === 'new';
var fname = match[2];
var evalOrigin = match[3];
var evalFile = match[4];
var evalLine = Number(match[5]);
var evalCol = Number(match[6]);
var file = match[7];
var lnum = match[8];
var col = match[9];
var native = match[10] === 'native';
var closeParen = match[11] === ')';
var res = {};
if (lnum) {
res.line = Number(lnum);
}
if (col) {
res.column = Number(col);
}
if (closeParen && file) {
// make sure parens are balanced
// if we have a file like "asdf) [as foo] (xyz.js", then odds are
// that the fname should be += " (asdf) [as foo]" and the file
// should be just "xyz.js"
// walk backwards from the end to find the last unbalanced (
var closes = 0;
for (var i = file.length - 1; i > 0; i--) {
if (file.charAt(i) === ')') {
closes ++;
} else if (file.charAt(i) === '(' && file.charAt(i - 1) === ' ') {
closes --;
if (closes === -1 && file.charAt(i - 1) === ' ') {
var before = file.substr(0, i - 1);
var after = file.substr(i + 1);
file = after;
fname += ' (' + before;
break;
}
}
}
}
if (fname) {
var methodMatch = fname.match(methodRe);
if (methodMatch) {
fname = methodMatch[1];
var meth = methodMatch[2];
}
}
this._setFile(res, file);
if (ctor) {
res.constructor = true;
}
if (evalOrigin) {
res.evalOrigin = evalOrigin;
res.evalLine = evalLine;
res.evalColumn = evalCol;
res.evalFile = evalFile && evalFile.replace(/\\/g, '/');
}
if (native) {
res.native = true;
}
if (fname) {
res.function = fname;
}
if (meth && fname !== meth) {
res.method = meth;
}
return res;
};
var bound = new StackUtils();
Object.keys(StackUtils.prototype).forEach(function (key) {
StackUtils[key] = bound[key].bind(bound);
});
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