我正在使用PHP和libtidy尝试进行屏幕抓取,这可能是历史上对HTML表的最恐怖和畸形的使用。该站点关闭几个表,tr,td,字体或粗体标签,并在表中始终嵌套许多不同的表层。

示例片段:

<center>
<table border="1" bordercolor="#000000" cellspacing="0" cellpadding="0">
<tr>
<td width="50%">
<center>
Home Team - <b>Wildcats<td>
<center>
Away Team - <b>Polar Bears<tr>
<td colspan="2">
<center>
<b><font size="+1">Rosters<tr>
<td valign="top">
<center>
<table border="0" cellspacing="0">
<tr>
<td>
<font size="2">1&nbsp;<td>
<font size="2">Baird, T<tr>
<td>
<font size="2">2&nbsp;<td>
<font size="2">Knight, P<tr>
<td>
<font size="2">8&nbsp;<td>
<font size="2">Miller, B<tr>
<td>
<font size="2">9&nbsp;<td>
<font size="2">Huebsch, B<tr>
<td>
<font size="2">11&nbsp;<td>
<font size="2">Buschmann, C<tr>
<td>
<font size="2">12&nbsp;<td>
<font size="2">Reding, J<tr>
<td>
<font size="2">14&nbsp;<td>
<font size="2">Simpson, S<tr>
<td>
<font size="2">27&nbsp;<td>
<font size="2">Kupferschmidt, M<tr>
<td>
<font size="2">28&nbsp;<td>
<font size="2">Anderson, D<tr>
<td>
<font size="2">31&nbsp;<td>
<font size="2">Gehrts, J<tr>
<td>
<font size="2">39&nbsp;<td>
<font size="2">McGinnis, G<tr>
<td>
<font size="2">42&nbsp;<td>
<font size="2">Temple, B<tr>
<td>
<font size="2">44&nbsp;<td>
<font size="2">Kemplin, A<tr>
<td>
<font size="2">77&nbsp;<td>
<font size="2">Weiner, B<tr>
<td>
<font size="2">95&nbsp;<td>
<font size="2">
Zytkoskie, D</table>
<td valign="top">
<center>
<table border="0" cellspacing="0">
<tr>
<td>
<font size="2">5&nbsp;<td>
<font size="2">Mack, A<tr>
<td>
<font size="2">8&nbsp;<td>
<font size="2">Foucault, R<tr>
<td>
<font size="2">11&nbsp;<td>
<font size="2">Oberpriller, D *<tr>
<td>
<font size="2">12&nbsp;<td>
<font size="2">Underwood, J<tr>
<td>
<font size="2">15&nbsp;<td>
<font size="2">Oberpriller, M<tr>
<td>
<font size="2">19&nbsp;<td>
<font size="2">Langfus, B<tr>
<td>
<font size="2">25&nbsp;<td>
<font size="2">Carroll, R<tr>
<td>
<font size="2">30&nbsp;<td>
<font size="2">Hirdler, T<tr>
<td>
<font size="2">33&nbsp;<td>
<font size="2">Gibson, S<tr>
<td>
<font size="2">35&nbsp;<td>
<font size="2">Marthaler, C<tr>
<td>
<font size="2">44&nbsp;<td>
<font size="2">Yurik, J<tr>
<td>
<font size="2">58&nbsp;<td>
<font size="2">
Gronemeyer, S</table>
<tr>
<td colspan="2">
<center>
<b><font size="+1">Goals<tr>
<td valign="top">
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Player<td>
<b><font size="2">Period<td>
<b><font size="2">Time<td>
<b><font size="2">Assist 1<td>
<b><font size="2">Assist 2<td>
<b><font size="2">SH<td>
<b><font size="2">PP<tr>
<td nowrap>
<font size="2">Kupferschmidt,&nbsp;M<td>
<font size="2">1<td>
<font size="2">12:51<td nowrap>
<font size="2">Kemplin,&nbsp;A<td nowrap>
<font size="2">None<td>
<font size="2">
<center>
<td>
<font size="2">
<center>
<tr>
<td nowrap>
<font size="2">McGinnis,&nbsp;G<td>
<font size="2">1<td>
<font size="2">12:33<td nowrap>
<font size="2">Huebsch,&nbsp;B<td nowrap>
<font size="2">None<td>
<font size="2">
<center>
<td>
<font size="2">
<center>
<tr>
<td nowrap>
<font size="2">Kupferschmidt,&nbsp;M<td>
<font size="2">2<td>
<font size="2">16:01<td nowrap>
<font size="2">None<td nowrap>
<font size="2">None<td>
<font size="2">
<center>
<td>
<font size="2">
<center>
<tr>
<td nowrap>
<font size="2">Buschmann,&nbsp;C<td>
<font size="2">3<td>
<font size="2">00:38<td nowrap>
<font size="2">None<td nowrap>
<font size="2">None<td>
<font size="2">
<center>
<td>
<font size="2">
<center>
</table>
<td valign="top">
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Player<td>
<b><font size="2">Period<td>
<b><font size="2">Time<td>
<b><font size="2">Assist 1<td>
<b><font size="2">Assist 2<td>
<b><font size="2">SH<td>
<b><font size="2">PP<tr>
<td nowrap>
<font size="2">Oberpriller,&nbsp;D *<td>
<font size="2">3<td>
<font size="2">12:31<td nowrap>
<font size="2">Gronemeyer,&nbsp;S<td nowrap>
<font size="2">None<td>
<font size="2">
<center>
<td>
<font size="2">
<center>
</table>
<tr>
<td colspan="2">
<center>
<b><font size="+1">Penalties<tr>
<td valign="top">
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Player<td>
<font size="2"><b>Period<td>
<font size="2"><b>Minutes<td>
<font size="2"><b>Offense<td>
<font size="2"><b>Start<td>
<font size="2"><b>Expired<tr>
<td nowrap>
<font size="2">Buschmann,&nbsp;C<td>
<font size="2">
<center>
3<td>
<font size="2">
<center>
2<td>
<font size="2">Interference<td>
<font size="2">11:11<td>
<font size="2">09:11<tr>
<td nowrap>
<font size="2">Buschmann,&nbsp;C<td>
<font size="2">
<center>
3<td>
<font size="2">
<center>
2<td>
<font size="2">Unsportmanlike Conduct<td>
<font size="2">03:26<td>
<font size="2">01:26<tr>
<td nowrap>
<font size="2">Bench<td>
<font size="2">
<center>
3<td>
<font size="2">
<center>
2<td>
<font size="2">Too Many Men<td>
<font size="2">01:46<td>
<font size="2">
00:00</table>
<td valign="top">
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Player<td>
<font size="2"><b>Period<td>
<font size="2"><b>Minutes<td>
<font size="2"><b>Offense<td>
<font size="2"><b>Start<td>
<font size="2"><b>Expired<tr>
<td nowrap>
<font size="2">Marthaler,&nbsp;C<td>
<font size="2">
<center>
1<td>
<font size="2">
<center>
2<td>
<font size="2">Interference<td>
<font size="2">01:19<td>
<font size="2">16:19<tr>
<td nowrap>
<font size="2">Underwood,&nbsp;J<td>
<font size="2">
<center>
2<td>
<font size="2">
<center>
2<td>
<font size="2">Interference<td>
<font size="2">12:32<td>
<font size="2">10:32<tr>
<td nowrap>
<font size="2">Marthaler,&nbsp;C<td>
<font size="2">
<center>
3<td>
<font size="2">
<center>
2<td>
<font size="2">Interference<td>
<font size="2">11:39<td>
<font size="2">
09:39</table>
<tr>
<td colspan="2">
<center>
<font size="+1"><b>Goalies<tr>
<td>
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Name<td>
<font size="2"><b>Shots<td>
<font size="2"><b>Goals<tr>
<td>
<font size="2">Baird,&nbsp;T<td>
<font size="2">20<td>
<font size="2">1<tr>
<td>
<font size="2"><b>Open Net<td>
<td>
<font size="2">
0</table>
<td>
<center>
<table border="1" cellspacing="0" width="100%">
<td>
<b><font size="2">Name<td>
<font size="2"><b>Shots<td>
<font size="2"><b>Goals<tr>
<td>
<font size="2">Hirdler,&nbsp;T<td>
<font size="2">42<td>
<font size="2">

不可思议的是,所有浏览器似乎都可以很好地呈现这一点。
PHPTidy设法很好地理解了这一切,但是表是如此深且几乎是随机嵌套的,以至于很难使用DOM XPath遍历。

有人对采用其他方法的建议有任何建议吗?

事后发布:经过太多比利时小麦啤酒并弄污了我的代码后,我获得了不错的效果,方法是通过strip_tags()除去表,tr和td之外的所有标签,然后通过libtidy运行它。现在,它的格式精美,并且很容易遍历。似乎只需要稍微按摩一下,然后再将其发送到解析器。

最佳答案

您可以使用一些技巧来清理表等高度可预测的结构。在运行HTML tidy之前,您可以使用Regex或类似内容搜索<tr><td>,然后搜索另一个<tr><td>,并在其之前插入相应的更近距离。在<td>中容纳表有一些增加的技巧,但是没有什么是不可能处理的。只需从找到最里面的结构并从那里向外移动开始。

真正的难题是诸如未闭合的<div><p>之类的东西,很难与它们对应的(或缺少)闭合器匹配。

关于php - 屏幕抓取您一生中见过的最丑陋的HTML,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/732513/

10-14 13:46
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