autoload/ale/uri.vim


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function! s:EncodeChar(char) abort
    let l:result = ''

    for l:index in range(strlen(a:char))
        let l:result .= printf('%%%02x', char2nr(a:char[l:index]))
    endfor

    return l:result
endfunction

function! ale#uri#Encode(value) abort
    return substitute(
    \   a:value,
    \   '\([^a-zA-Z0-9\\/$\-_.!*''(),]\)',
    \   '\=s:EncodeChar(submatch(1))',
    \   'g'
    \)
endfunction

function! ale#uri#Decode(value) abort
    return substitute(
    \   a:value,
    \   '%\(\x\x\)',
    \   '\=printf("%c", str2nr(submatch(1), 16))',
    \   'g'
    \)
endfunction