API for combining call site modifiers
npm install stack-chain> API for combining call site modifyers
``sheel`
npm install stack-chainAPI documentation
`JavaScript`
var chain = require('stack-chain');
When the Error.stack getter is executed, the stack-chain will perform the
following:
1. execute the modifiers attached by chain.extend.modifiers
2. execute the attached by chain.filter.formater
3. execute the set by chain.format.replace.
Will modify the callSite array. Note you shouldn't format the stack trace.
The modifier is a function there takes two arguments error and frames.
* error is the Error object.frames
* is an array of callSite objects, see
v8 documentation
for details.
When the modifier is done, it should return a modified frames array.
`JavaScript
chain.filter.attach(function (error, frames) {
// Filter out traces related to this file
var rewrite = frames.filter(function (callSite) {
return callSite.getFileName() !== module.filename;
});
return rewrite;
});
`
Removes a modifier function from the list of modifiers.
`JavaScript
var modifier = function () {};
// Attach modifier function
chain.extend.attach(modifier);
// Deattach modifier function
chain.extend.deattach(modifier);
`
Replaces the default v8 formater. The new formater takes a two argumentserror and frames.
* error is the Error object.callSites
* is an array of callSite objects, see
v8 documentation
for details.
When the formater is done, it should return a string. The string willError.stack
what returns.
`JavaScript
chain.format.replace(function (error, frames) {
var lines = [];
lines.push(error.toString());
for (var i = 0; i < frames.length; i++) {
lines.push(" at " + frames[i].toString());
}
return lines.join("\n");
});
`
Will restore the default v8 formater. Note that dude to the nature of v8Error objects, if one of the getters Error.stack or Error.callSite hasError.stack
already executed, the value of won't change.
This will return the unmodified callSite array from the current tick. This.stack
is a performance shortcut, as it does not require generating the Error().callSite
string. This behaviour is different from the properties.
While this is mostly generating callSite in hot code, it can be useful tooptions
do some modification on the array. The object, supports the following:
`javascript
options = {
// (default false) run the extenders on the callSite array.
extend: true,
// (default false) run the filters on the callSite array.
filter: true,
// (default 0) before running extend or filter methods, slice of some of the
// end. This can be useful for hiding the place from where you called this
// function.
slice: 2
}
`
Returns the original callSite array.
Returns the mutated callSite array, that is after extend and filterError.stackTraceLimit
is applied. The array will not exceed the .
This limites the size of the callSites array. The default value is 10, andInfinity`. See
can be set to any positive number including
v8 documentation
for details.
The software is license under "MIT"
> Copyright (c) 2012 Andreas Madsen
>
> Permission is hereby granted, free of charge, to any person obtaining a copy
> of this software and associated documentation files (the "Software"), to deal
> in the Software without restriction, including without limitation the rights
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> copies of the Software, and to permit persons to whom the Software is
> furnished to do so, subject to the following conditions:
>
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>
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