Unscanny

Painless string scanning.

rewrite Unscanny in moonbit

[dependencies]
unscanny = "0.1.0"

Basically, you'll want to use this package if it's too much pain to solve your problem with a bare iterator. Speaking more broadly, unscanny is useful in these situations:

• You need to parse simple flat grammars (dates, times, custom stuff, ...) and want an interface that's a bit more convenient to use than a simple char iterator.
• You're hand-writing a tokenizer.

The Scanner keeps an internal cursor, allows you to peek around it, advance it beyond chars or other patterns and easily slice substrings before and after the cursor.

Example

Recognizing and parsing a simple comma separated list of floats.

let s = Scanner::new(" +12 , -15.3, 14.3  ")
let nums = []
while not(s.done()) {
    let _ = s.eat_whitespace()
    let start = s.cursor()
    let _ = s.eat_if(['+', '-'])
    let _ = s.eat_while(CharPredicate::new(Char::is_ascii_digit))
    let _ = s.eat_if('.')
    let _ = s.eat_while(CharPredicate::new(Char::is_ascii_digit))
    nums.push(@strconv.parse_double(s.from(start)));
    let _ = s.eat_whitespace();
    let _ = s.eat_if(',');
}
assert_eq(nums, [12.0, -15.3, 14.3])