import { parse } from '@elodin/parser' 
import { traverse } from '@elodin/traverser' 
 
const input = ` 
style Button {
  backgroundColor: red
  paddingLeft: 10
  paddingRight: 10
}` 
 
// this visitors adds 5 to every Integer node 
const visitors = { 
  Integer: { 
    enter(path) { 
      path.node.value += 5 
    }, 
  }, 
} 
 
const ast = traverse(parse(input), visitors)

Visitors

A visitor contains an

enter

and/or

exit

function for a specific AST node type.
Enter is called once the AST node is reached while exit is called once the AST node with its sub nodes was fully processed.
Both are called with a

path

object.

Path

The path object contains all data and methods for the current AST node.

Property	Description
node	The current AST node
parent	The parent AST node
traverse	The traverse method just for convenience when doing nested traversals
context	An object with context information (e.g. file path)
replaceNode	A function that takes an AST node to replace the current AST node. Note: Only available for container AST nodes
removeNode	Removes the current AST node from its parent