Created
December 31, 2011 03:59
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ScalaでjQueryっぽいこと
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| import scala.xml._ | |
| import scala.util.parsing.combinator._ | |
| trait SelectorParser extends RegexParsers { | |
| val html: NodeSeq | |
| def tagSelector(tag: String)(filter: NodeSeq => Boolean): NodeSeq = html \\ tag filter filter | |
| def idFilter(id: String): NodeSeq => Boolean = (n: NodeSeq) => (n \ "@id" text) == id | |
| def classFilter(cls: String): NodeSeq => Boolean = (n: NodeSeq) => (n \ "@class" text) == cls | |
| def idPrefix = "#" | |
| def classPrefix = "." | |
| def token = rep1("""[a-zA-Z-_:]""".r) ^^ { _.mkString } | |
| def tag = token ^^ tagSelector | |
| def id = idPrefix ~> token ^^ idFilter | |
| def cls = classPrefix ~> token ^^ classFilter | |
| def attr = id | cls | |
| def selector = opt(tag) ~ opt(attr) ^^ { | |
| case Some(t) ~ Some(a) => t(a) | |
| case Some(t) ~ None => t(_ => true) | |
| case _ => NodeSeq.Empty | |
| } | |
| def parse(in: String) = parseAll(selector, in) match { | |
| case Success(res, _) => res | |
| case _ => NodeSeq.Empty | |
| } | |
| } | |
| class SQuery(val html: NodeSeq) extends SelectorParser { | |
| def apply(selector: String): NodeSeq = parse(selector) | |
| } | |
| object Main { | |
| val html = | |
| <html> | |
| <head> | |
| <title> | |
| </title> | |
| </head> | |
| <body> | |
| <div id="container"> | |
| <div class="contents"> | |
| <span id="hello">Hello</span> | |
| </div> | |
| </div> | |
| </body> | |
| </html> | |
| def main(args: Array[String]): Unit = { | |
| val $ = new SQuery(html) | |
| $("div") foreach { x => | |
| println(x) | |
| println() | |
| } | |
| /* result: | |
| <div id="container"> | |
| <div class="contents"> | |
| <span id="hello">Hello</span> | |
| </div> | |
| </div> | |
| <div class="contents"> | |
| <span id="hello">Hello</span> | |
| </div> | |
| */ | |
| println($("div.contents")) | |
| /* result: | |
| <div class="contents"> | |
| <span id="hello">Hello</span> | |
| </div> | |
| */ | |
| println($("span#hello").text) | |
| /* result: | |
| Hello | |
| */ | |
| } | |
| } |
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