/**
* 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_());
}
/**
* Splits this lazy string by characters matching the given predicate.
*
* @param p A predicate that matches characters to be considered delimiters.
* @return A stream of the substrings in this lazy string, when separated by the given predicate.
*/
public Stream<LazyString> split(final F<Character, Boolean> p) {
final Stream<Character> findIt = s.dropWhile(p);
final P2<Stream<Character>, Stream<Character>> ws = findIt.split(p);
return findIt.isEmpty()
? Stream.<LazyString>nil()
: Stream.cons(
fromStream(ws._1()),
new P1<Stream<LazyString>>() {
public Stream<LazyString> _1() {
return fromStream(ws._2()).split(p);
}
});
}
/**
* Returns a parser that produces the given number of characters, or fails with the given error.
*
* @param missing The error if the given number of characters is unavailable.
* @param n The number of characters to produce in the parse result.
* @return A parser that produces the given number of characters, or fails with the given error.
*/
public static <E> Parser<Stream<Character>, Stream<Character>, E> characters(
final F0<E> missing, final int n) {
return n <= 0
? Parser.<Stream<Character>, Stream<Character>, E>value(Stream.<Character>nil())
: character(missing).bind(characters(missing, n - 1), Stream.<Character>cons_());
}
/**
* Returns a parser that repeats application of this parser zero or many times.
*
* @return A parser that repeats application of this parser zero or many times.
*/
public Parser<I, Stream<A>, E> repeat() {
return repeat1().or(() -> value(Stream.<A>nil()));
}