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package scala.xml.dtd ;
/** Scanner for regexps (content models in DTD element declarations)
* todo: cleanup
*/
class Scanner extends Tokens with parsing.TokenTests {
// zzz constants zzz
final val ENDCH = '\u0000';
// zzz fields zzz
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 ) = {
//Console.println("[scanner init on \""+s+"\"]");
value = "";
it = Iterator.fromString( s );
token = 1+END;
next;
nextToken;
}
/** scans the next token */
final def nextToken:Unit = {
if( token != END ) token = readToken;
//Console.println("["+token2string( token )+"]");
}
// zzz scanner methods zzz
// 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 ):Unit =
if( c == d ) next; else error("expected '"+d+"' found '"+c+"' !");
final def accS( ds:Seq[Char] ):Unit = {
val jt = ds.elements; while( jt.hasNext ) { acc( jt.next ) }
}
/*
final def isSpace = c match {
case '\u0020' | '\u0009' | '\u000D' | '\u000A' => true
case _ => false;
}
*/
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 {
error("unexpected character:"+c); END
}
}
final def name = {
val sb = new StringBuffer();
do { sb.append( c ); next } while ( isNameChar( c ) ) ;
value = sb.toString();
NAME
}
}
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