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Dir : ~/var/www/invoice/node_modules/dash-ast/

Edit File: index.js

var assert = require('assert')

module.exports = dashAst

/**
 * Call `cb` on each node in `ast`. If `cb` is an object, `cb.enter` is called before processing a Node's children,
 * and `cb.leave` is called after processing a Node's children.
 */
function dashAst (ast, cb) {
  assert(ast && typeof ast === 'object' && typeof ast.type === 'string',
    'dash-ast: ast must be an AST node')

if (typeof cb === 'object') {
    assert(typeof cb.enter === 'function' || typeof cb.leave === 'function',
      'dash-ast: visitor must be an object with enter/leave functions')

walk(ast, null, cb.enter || undefined, cb.leave || undefined)
  } else {
    assert(cb && typeof cb === 'function',
      'dash-ast: callback must be a function')

walk(ast, null, cb, undefined)
  }
}

function walk (node, parent, enter, leave) {
  var cont = enter !== undefined ? enter(node, parent) : undefined
  if (cont === false) return

for (var k in node) {
    if (has(node, k)) {
      if (k === 'parent') continue
      var v = node[k]
      if (isNode(v)) {
        walk(v, node, enter, leave)
      } else if (Array.isArray(v)) {
        walkArray(v, node, enter, leave)
      }
    }
  }

if (leave !== undefined) leave(node, parent)
}

function walkArray (nodes, parent, enter, leave) {
  for (var i = 0; i < nodes.length; i++) {
    if (isNode(nodes[i])) walk(nodes[i], parent, enter, leave)
  }
}

function isNode (node) {
  return typeof node === 'object' && node && typeof node.type === 'string'
}

function has (obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop)
}