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codeql-action/node_modules/estraverse/README.md
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### Estraverse [](http://travis-ci.org/estools/estraverse) | |
Estraverse ([estraverse](http://github.com/estools/estraverse)) is | |
[ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm) | |
traversal functions from [esmangle project](http://github.com/estools/esmangle). | |
### Documentation | |
You can find usage docs at [wiki page](https://github.com/estools/estraverse/wiki/Usage). | |
### Example Usage | |
The following code will output all variables declared at the root of a file. | |
```javascript | |
estraverse.traverse(ast, { | |
enter: function (node, parent) { | |
if (node.type == 'FunctionExpression' || node.type == 'FunctionDeclaration') | |
return estraverse.VisitorOption.Skip; | |
}, | |
leave: function (node, parent) { | |
if (node.type == 'VariableDeclarator') | |
console.log(node.id.name); | |
} | |
}); | |
``` | |
We can use `this.skip`, `this.remove` and `this.break` functions instead of using Skip, Remove and Break. | |
```javascript | |
estraverse.traverse(ast, { | |
enter: function (node) { | |
this.break(); | |
} | |
}); | |
``` | |
And estraverse provides `estraverse.replace` function. When returning node from `enter`/`leave`, current node is replaced with it. | |
```javascript | |
result = estraverse.replace(tree, { | |
enter: function (node) { | |
// Replace it with replaced. | |
if (node.type === 'Literal') | |
return replaced; | |
} | |
}); | |
``` | |
By passing `visitor.keys` mapping, we can extend estraverse traversing functionality. | |
```javascript | |
// This tree contains a user-defined `TestExpression` node. | |
var tree = { | |
type: 'TestExpression', | |
// This 'argument' is the property containing the other **node**. | |
argument: { | |
type: 'Literal', | |
value: 20 | |
}, | |
// This 'extended' is the property not containing the other **node**. | |
extended: true | |
}; | |
estraverse.traverse(tree, { | |
enter: function (node) { }, | |
// Extending the existing traversing rules. | |
keys: { | |
// TargetNodeName: [ 'keys', 'containing', 'the', 'other', '**node**' ] | |
TestExpression: ['argument'] | |
} | |
}); | |
``` | |
By passing `visitor.fallback` option, we can control the behavior when encountering unknown nodes. | |
```javascript | |
// This tree contains a user-defined `TestExpression` node. | |
var tree = { | |
type: 'TestExpression', | |
// This 'argument' is the property containing the other **node**. | |
argument: { | |
type: 'Literal', | |
value: 20 | |
}, | |
// This 'extended' is the property not containing the other **node**. | |
extended: true | |
}; | |
estraverse.traverse(tree, { | |
enter: function (node) { }, | |
// Iterating the child **nodes** of unknown nodes. | |
fallback: 'iteration' | |
}); | |
``` | |
When `visitor.fallback` is a function, we can determine which keys to visit on each node. | |
```javascript | |
// This tree contains a user-defined `TestExpression` node. | |
var tree = { | |
type: 'TestExpression', | |
// This 'argument' is the property containing the other **node**. | |
argument: { | |
type: 'Literal', | |
value: 20 | |
}, | |
// This 'extended' is the property not containing the other **node**. | |
extended: true | |
}; | |
estraverse.traverse(tree, { | |
enter: function (node) { }, | |
// Skip the `argument` property of each node | |
fallback: function(node) { | |
return Object.keys(node).filter(function(key) { | |
return key !== 'argument'; | |
}); | |
} | |
}); | |
``` | |
### License | |
Copyright (C) 2012-2016 [Yusuke Suzuki](http://github.com/Constellation) | |
(twitter: [@Constellation](http://twitter.com/Constellation)) and other contributors. | |
Redistribution and use in source and binary forms, with or without | |
modification, are permitted provided that the following conditions are met: | |
* Redistributions of source code must retain the above copyright | |
notice, this list of conditions and the following disclaimer. | |
* Redistributions in binary form must reproduce the above copyright | |
notice, this list of conditions and the following disclaimer in the | |
documentation and/or other materials provided with the distribution. | |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY | |
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |