'use strict'

module.exports = (File) ->
    {Element} = File
    {Tag, Text} = Element

    checkNode = (node) ->
        if node instanceof Text
            # trim
            node.text = node.text.replace /^[\s\uFEFF\xA0]+/g, ''
            node.text = node.text.replace /([^\r\n]+)(?:[\s\uFEFF\xA0]*)$/g, '$1'

            # remove empty texts
            if node.text.length is 0
                node.parent = null

        # check nodes recursively
        if node instanceof Tag
            for child in node.children by -1
                checkNode child

        return