/**
* Returns a parser that produces the given stream of characters or fails otherwise.
*
* @param missing The error if the producing stream could not supply more characters.
* @param sat The error if a character was produced that is not the given stream of characters.
* @param cs The stream of characters to produce.
* @return A parser that produces the given stream of characters or fails otherwise.
*/
public static <E> Parser<Stream<Character>, Stream<Character>, E> characters(
final F0<E> missing, final F<Character, E> sat, final Stream<Character> cs) {
return cs.isEmpty()
? Parser.<Stream<Character>, Stream<Character>, E>value(Stream.<Character>nil())
: character(missing, sat, cs.head())
.bind(characters(missing, sat, cs.tail()._1()), Stream.<Character>cons_());
}
/**
* Returns the first character of this string.
*
* @return The first character of this string, or error if the string is empty.
*/
public char head() {
return s.head();
}
public String toStringLazy() {
return s.isEmpty() ? "" : "LazyString(" + Show.charShow.showS(s.head()) + ", ?)";
}