using System;

using HtmlAgilityPack;

using ScrapySharp.Extensions;

using Smallcode.Net.Extensions;

namespace Smallcode.Net

{

public class FormParser

{

private readonly HtmlNode _form;

public FormParser(string html)

{

var htmlDocument = new HtmlDocument();

htmlDocument.LoadHtml(html);

_form = htmlDocument.DocumentNode.SelectSingleNode("//form[1]");

if (_form == null) throw new Exception("ÔÚHTMLÔ´´úÂëÖÐÕÒ²»µ½Form±êÇ©");

}

public FormData FormData

{

get

{

var data = new FormData();

var nodes = _form.SelectNodes("//input[@type!='submit'] | //input[@type!='button'] | //select | //textarea");

if (nodes == null) return data;

foreach (var node in nodes)

{

var name = node.GetAttributeValue("name");

if (!(string.IsNullOrWhiteSpace(name) || data.ContainsKey(name)))

data.Set(name, node.GetAttributeValue("value", ""));

}

return data;

}

}

public string GetAction(Uri baseUri)

{

return _form.GetAttributeValue("action", "").MakeAbsoluteUri(baseUri);

}

public string GetImageUrl(Uri baseUri, string xPath)

{

var img = _form.SelectSingleNode(xPath);

return img != null ? img.GetAttributeValue("src").MakeAbsoluteUri(baseUri) : string.Empty;

}

}

}