TDOP Pratt
Top Down Operator Precedence Vaughan R. Pratt Massachusetts Institute of Technology 1973 Work reported herein was supported in part at Stanford by the National Science Foundation under grant no GJ 992, and the Office of Naval Research under grant number N-00014-67-A-Oll2-0057 NR 044-402; by IBM under a post-doctoral fellowship at Stanford; by the IBM T.J. Watson Research Center, Yorktown Heights,
Pratt Parsers: Expression Parsing Made Easy – journal.stuffwithstuff.com
↩ ↪ March 19, 2011 code java js language magpie parsing Every now and then, I stumble onto some algorithm or idea that’s so clever and such a perfect solution to a problem that I feel like I got smarter or gained a new superpower just by learning it. Heaps were one, just about the only thing I got out of my truncated CS education. I recently stumbled onto another: Pratt or “top-down operator prece
neue cc - C#でスクレイピング:HTMLパース(Linq to Html)のためのSGMLReader利用法
Linq to XmlがあるならLinq to Htmlもあればいいのに！と思った皆様こんばんは。まあ、DOMでしょ？ツリーでしょ？XHTMLならそのままXDocument.Loadで行けるよね？XDocument.Parseで行けるよね？ ええ、ええ、行けますとも。XHTMLなら、ね、ValidなXHTMLならね。世の中のXHTML詐称の99.99%がそのまま解析出来るわけがなく普通に落ちてくれるので、XDocumentにそのまま流しこむことは出来ないわけです(もちろん、うちのサイトも詐称ですよ！ていうかこのサイトのHTMLは酷すぎるのでそのうち何とかしたい……)。 そこでHtmlを整形してXmlに変換するツールの出番なわけですが、まず名前が上がるのがTidy、の.NET移植であるTidy.NETで、これは論外。とにかく面倒くさい上に、パースしきれてなくてXDocumentに流すと平然と
Beautiful Soup: We called him Tortoise because he taught us.
You didn't write that awful page. You're just trying to get some data out of it. Beautiful Soup is here to help. Since 2004, it's been saving programmers hours or days of work on quick-turnaround screen scraping projects. Beautiful Soup is a Python library designed for quick turnaround projects like screen-scraping. Three features make it powerful: Beautiful Soup provides a few simple methods and
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