StringScanner#peek

peek(len)

static VALUE
strscan_peek(VALUE self, VALUE vlen)
{
    struct strscanner *p;
    long len;

    GET_SCANNER(self, p);

    len = NUM2LONG(vlen);
    if (EOS_P(p))
        return str_new(p, "", 0);

    len = minl(len, S_RESTLEN(p));
    return extract_beg_len(p, p->curr, len);
}

Extracts a string corresponding to string[pos,len], without advancing the scan pointer.

Example

s = StringScanner.new('test string')
s.peek(7)          # => "test st"
s.peek(7)          # => "test st"

See also #named_captures #peep #matched_size #pointer also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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