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class WordList inherits System {
word: String;
next: WordList;
init(value: String, tail: Object) : WordList {{
assert(not (isvoid value), "init", "value argument cannot be void!");
assert(word = "", "init", "List has already been initialised!");
word <- value;
if isvoid tail then
void
else
case tail of
wl: WordList => next <- wl;
o: Object => assert(false, "init", "tail argument can be either a ConsumerList or void!");
esac
fi;
self;
}};
push(value: String) : WordList {{
assert(not (isvoid value), "push", "value argument cannot be void!");
if word = ""
then
word <- value
else if isvoid next
then
next <- (new WordList).init(value, void)
else
next.push(value)
fi
fi;
self;
}};
any_starts(s: String, start: Int) : Int {
if or(word = "", s.length() <= start)
then
0
else if and(s.length() < start + word.length(), not isvoid next)
then
next.any_starts(s, start)
else if s.substr(start, word.length()) = word
then
word.length()
else if isvoid next
then
0
else
next.any_starts(s, start)
fi
fi
fi
fi
};
empty() : Bool {
if not (word = "")
then
false
else if isvoid next
then
true
else
next.empty()
fi
fi
};
};
class IWordsConsumer inherits IStringConsumer {
matched_words: WordList <- new WordList;
consume(s: String) : Int {
let
word_length: Int <- 0
in {
assert(not matched_words.empty(), "consume", "object of class hasn't been initialised!");
consumed_length <- 0;
while 0 < (word_length <- matched_words.any_starts(s, consumed_length))
loop
consumed_length <- consumed_length + word_length
pool;
consumed_length;
}};
};
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