ale/ale_linters/json/jsonlint.vim

" Author: KabbAmine <amine.kabb@gmail.com>

function! ale_linters#json#jsonlint#Handle(buffer, lines) abort
    " Matches patterns like the following:
    " line 2, col 15, found: 'STRING' - expected: 'EOF', '}', ',', ']'.

    let l:pattern = '^line \(\d\+\), col \(\d*\), \(.\+\)$'
    let l:output = []

    for l:line in a:lines
        let l:match = matchlist(l:line, l:pattern)

        if len(l:match) == 0
            continue
        endif

        " vcol is needed to indicate that the column is a character
        call add(l:output, {
        \   'bufnr': a:buffer,
        \   'lnum': l:match[1] + 0,
        \   'vcol': 0,
        \   'col': l:match[2] + 0,
        \   'text': l:match[3],
        \   'type': 'E',
        \   'nr': -1,
        \})
    endfor

    return l:output
endfunction

call ale#linter#Define('json', {
\   'name': 'jsonlint',
\   'executable': 'jsonlint',
\   'output_stream': 'stderr',
\   'command': 'jsonlint --compact -',
\   'callback': 'ale_linters#json#jsonlint#Handle',
\})