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Scala example source code file (Scanner.scala)

This example Scala source code file (Scanner.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

a, char, char, end, end, endch, endch, int, name, name, scanner, seq, string, z

The Scala Scanner.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala.xml
package dtd

/** Scanner for regexps (content models in DTD element declarations) 
 *  todo: cleanup
 */
class Scanner extends Tokens with parsing.TokenTests {

  final val ENDCH = '\u0000'

  var token:Int = END
  var value:String = _
  
  private var it: Iterator[Char] = null
  private var c: Char = 'z'

  /** initializes the scanner on input s */
  final def initScanner(s: String) {
    value = ""
    it = (s).iterator
    token = 1+END
    next
    nextToken
  }

  /** scans the next token */
  final def nextToken() {
    if (token != END) token = readToken
  }

  // todo: see XML specification... probably isLetter,isDigit is fine
  final def isIdentChar = ( ('a' <= c && c <= 'z') 
                           || ('A' <= c && c <= 'Z'));
  
  final def next() = if (it.hasNext) c = it.next else c = ENDCH

  final def acc(d: Char) { 
    if (c == d) next else sys.error("expected '"+d+"' found '"+c+"' !");
  }

  final def accS(ds: Seq[Char]) { ds foreach acc }

  final def readToken: Int = 
    if (isSpace(c)) {
      while (isSpace(c)) c = it.next
      S
    } else c match {
      case '('   => next; LPAREN
      case ')'   => next; RPAREN
      case ','   => next; COMMA
      case '*'   => next; STAR
      case '+'   => next; PLUS
      case '?'   => next; OPT
      case '|'   => next; CHOICE
      case '#'   => next; accS( "PCDATA" ); TOKEN_PCDATA
      case ENDCH => END
      case _     => 
        if (isNameStart(c)) name; // NAME 
        else sys.error("unexpected character:" + c)
    }
  
  final def name = {
    val sb = new StringBuilder()
    do { sb.append(c); next } while (isNameChar(c));
    value = sb.toString()
    NAME
  }

}

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