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Scala parser combinator sample like HTML tag.
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import scala.util.parsing.combinator._ | |
import scala.language.postfixOps | |
object Main { | |
def main(args:Array[String]) = { | |
val sc = new java.util.Scanner(System.in) | |
val input = collection.mutable.ListBuffer[String]() | |
while(sc.hasNextLine) { | |
input += sc.nextLine | |
} | |
HtmlTagParser.parse(input.mkString("\n")) | |
} | |
object HtmlTagParser extends RegexParsers { | |
def element: HtmlTagParser.Parser[Unit] = startTag ~ content ~ endTag ^? ({ | |
case (stag ~ _ ~ etag) if stag == etag => | |
}, _ => "error") | |
def startTag = "<" ~> tagName <~ tagAttr <~ ">" | |
def endTag = "</" ~> tagName <~ ">" | |
def tagName = """[a-zA-Z]+""".r | |
def tagAttr = """[^>]*""".r | |
def content = ("""[^<]*""".r ~ element)* | |
def parse(str: String) = parseAll(element, str) match { | |
case NoSuccess(_, next) => println(next.pos.line) | |
case _ => | |
} | |
} | |
case class Tag(start: String, end: String) {} | |
} |
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