vimlrs 0.2.1

Faithful Rust port of the Vimscript (VimL) interpreter, from the Neovim C eval engine
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" match_startcount.vim — the {start} and {count} arguments of the match family
" (funcs.c find_some_match). match/matchend/matchstr/matchstrpos/matchlist all
" accept an optional {start} (where to begin) and {count} (which match: the Nth).
" Self-test into v:errors.

" --- match()/matchend() with {start}
call assert_equal(1, match('abcabc', 'b'))
call assert_equal(4, match('abcabc', 'b', 3))
call assert_equal(5, matchend('abcabc', 'b', 3))

" --- {count}: the Nth match (1-based), counting from {start}
call assert_equal(4, match('abcabc', 'b', 0, 2))
call assert_equal('Y', matchstr('aXbYc', '[A-Z]', 0, 2))
call assert_equal(-1, match('abcabc', 'b', 0, 3))

" --- matchstr()/matchlist() honour {start}
call assert_equal('2', matchstr('a1b2', '\d', 2))
call assert_equal('2', matchlist('a1b2', '\d', 2)[0])

" --- matchstrpos(): [match, start, end], shifted by {start}
call assert_equal(['2', 3, 4], matchstrpos('a1b2', '\d', 2))
call assert_equal(['', -1, -1], matchstrpos('abc', '\d'))

" --- List subject: match/matchend return the matching item's index
call assert_equal(1, match(['foo', 'bar', 'baz'], 'ba'))
call assert_equal(1, matchend(['foo', 'bar'], 'ba'))
call assert_equal(-1, match(['foo', 'bar'], 'zzz'))

" --- matchstr() on a List returns the whole matching item
call assert_equal('bar', matchstr(['foo', 'bar', 'baz'], 'a'))

" --- matchstrpos() on a List is [match, item_idx, start_col, end_col]
call assert_equal(['a', 1, 1, 2], matchstrpos(['foo', 'bar'], 'a'))

" --- matchlist() on a List gives the groups within the matching item
call assert_equal('1', matchlist(['foo', 'b1r'], '\d')[0])

" --- List {start} is an item index; {count} picks the Nth matching item
call assert_equal(1, match(['x', 'ax', 'x'], 'a', 1))
call assert_equal(2, match(['a', 'b', 'a'], 'a', 0, 2))

" --- regressions: no {start}/{count} behaves as before
call assert_equal(1, match('foobar', 'o'))
call assert_equal('oo', matchstr('foobar', 'o\+'))
call assert_equal(3, matchend('foobar', 'o\+'))
call assert_equal(['1', '', '', '', '', '', '', '', '', ''], matchlist('a1', '\d'))

if len(v:errors) > 0
  for err in v:errors
    echo err
  endfor
  throw 'match_startcount.vim: ' . len(v:errors) . ' assertion(s) failed'
endif
echo 'match_startcount.vim: all assertions passed'