Erik Römmelt d20e8a9d10 Fix EsLint Brackets (error markup 'const'). | 6 years ago | |
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.babelrc | 6 years ago | |
README.md | 6 years ago | |
esrecurse.js | 6 years ago | |
gulpfile.babel.js | 6 years ago | |
package.json | 6 years ago |
Esrecurse (esrecurse) is ECMAScript recursive traversing functionality.
The following code will output all variables declared at the root of a file.
esrecurse.visit(ast, {
XXXStatement: function (node) {
this.visit(node.left);
// do something...
this.visit(node.right);
}
});
We can use Visitor
instance.
var visitor = new esrecurse.Visitor({
XXXStatement: function (node) {
this.visit(node.left);
// do something...
this.visit(node.right);
}
});
visitor.visit(ast);
We can inherit Visitor
instance easily.
class Derived extends esrecurse.Visitor {
constructor()
{
super(null);
}
XXXStatement(node) {
}
}
function DerivedVisitor() {
esrecurse.Visitor.call(/* this for constructor */ this /* visitor object automatically becomes this. */);
}
util.inherits(DerivedVisitor, esrecurse.Visitor);
DerivedVisitor.prototype.XXXStatement = function (node) {
this.visit(node.left);
// do something...
this.visit(node.right);
};
And you can invoke default visiting operation inside custom visit operation.
function DerivedVisitor() {
esrecurse.Visitor.call(/* this for constructor */ this /* visitor object automatically becomes this. */);
}
util.inherits(DerivedVisitor, esrecurse.Visitor);
DerivedVisitor.prototype.XXXStatement = function (node) {
// do something...
this.visitChildren(node);
};
The childVisitorKeys
option does customize the behaviour of this.visitChildren(node)
.
We can use user-defined node types.
// 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
};
esrecurse.visit(
ast,
{
Literal: function (node) {
// do something...
}
},
{
// Extending the existing traversing rules.
childVisitorKeys: {
// TargetNodeName: [ 'keys', 'containing', 'the', 'other', '**node**' ]
TestExpression: ['argument']
}
}
);
We can use the fallback
option as well.
If the fallback
option is "iteration"
, esrecurse
would visit all enumerable properties of unknown nodes.
Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. node.parent
).
esrecurse.visit(
ast,
{
Literal: function (node) {
// do something...
}
},
{
fallback: 'iteration'
}
);
If the fallback
option is a function, esrecurse
calls this function to determine the enumerable properties of unknown nodes.
Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. node.parent
).
esrecurse.visit(
ast,
{
Literal: function (node) {
// do something...
}
},
{
fallback: function (node) {
return Object.keys(node).filter(function(key) {
return key !== 'argument'
});
}
}
);
Copyright © 2014 Yusuke Suzuki (twitter: @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 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.