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" Author: w0rp <devw0rp@gmail.com>
" Description: Language Server Protocol client code
" A List of connections, used for tracking servers which have been connected
" to, and programs which are run.
let s:connections = []
let g:ale_lsp_next_message_id = 1
function! s:NewConnection() abort
" id: The job ID as a Number, or the server address as a string.
" data: The message data received so far.
" executable: An executable only set for program connections.
" open_documents: A list of buffers we told the server we opened.
let l:conn = {
\ 'id': '',
\ 'data': '',
\ 'open_documents': [],
\}
call add(s:connections, l:conn)
return l:conn
endfunction
function! s:FindConnection(key, value) abort
for l:conn in s:connections
if has_key(l:conn, a:key) && get(l:conn, a:key) == a:value
return l:conn
endif
endfor
return {}
endfunction
function! ale#lsp#GetNextMessageID() abort
" Use the current ID
let l:id = g:ale_lsp_next_message_id
" Increment the ID variable.
let g:ale_lsp_next_message_id += 1
" When the ID overflows, reset it to 1. By the time we hit the initial ID
" again, the messages will be long gone.
if g:ale_lsp_next_message_id < 1
let g:ale_lsp_next_message_id = 1
endif
return l:id
endfunction
" TypeScript messages use a different format.
function! s:CreateTSServerMessageData(message) abort
let l:is_notification = a:message[0]
let l:obj = {
\ 'seq': v:null,
\ 'type': 'request',
\ 'command': a:message[1][3:],
\}
if !l:is_notification
let l:obj.seq = ale#lsp#GetNextMessageID()
endif
if len(a:message) > 2
let l:obj.arguments = a:message[2]
endif
let l:data = json_encode(l:obj) . "\n"
return [l:is_notification ? 0 : l:obj.seq, l:data]
endfunction
" Given a List of one or two items, [method_name] or [method_name, params],
" return a List containing [message_id, message_data]
function! ale#lsp#CreateMessageData(message) abort
if a:message[1] =~# '^ts@'
return s:CreateTSServerMessageData(a:message)
endif
let l:is_notification = a:message[0]
let l:obj = {
\ 'id': v:null,
\ 'jsonrpc': '2.0',
\ 'method': a:message[1],
\}
if !l:is_notification
let l:obj.id = ale#lsp#GetNextMessageID()
endif
if len(a:message) > 2
let l:obj.params = a:message[2]
endif
let l:body = json_encode(l:obj)
let l:data = 'Content-Length: ' . strlen(l:body) . "\r\n\r\n" . l:body
return [l:is_notification ? 0 : l:obj.id, l:data]
endfunction
function! ale#lsp#ReadMessageData(data) abort
let l:response_list = []
let l:remainder = a:data
while 1
" Look for the end of the HTTP headers
let l:body_start_index = matchend(l:remainder, "\r\n\r\n")
if l:body_start_index < 0
" No header end was found yet.
break
endif
" Parse the Content-Length header.
let l:header_data = l:remainder[:l:body_start_index - 4]
let l:length_match = matchlist(
\ l:header_data,
\ '\vContent-Length: *(\d+)'
\)
if empty(l:length_match)
throw "Invalid JSON-RPC header:\n" . l:header_data
endif
" Split the body and the remainder of the text.
let l:remainder_start_index = l:body_start_index + str2nr(l:length_match[1])
if len(l:remainder) < l:remainder_start_index
" We don't have enough data yet.
break
endif
let l:body = l:remainder[l:body_start_index : l:remainder_start_index - 1]
let l:remainder = l:remainder[l:remainder_start_index :]
" Parse the JSON object and add it to the list.
call add(l:response_list, json_decode(l:body))
endwhile
return [l:remainder, l:response_list]
endfunction
function! ale#lsp#HandleMessage(conn, message) abort
let a:conn.data .= a:message
" Parse the objects now if we can, and keep the remaining text.
let [a:conn.data, l:response_list] = ale#lsp#ReadMessageData(a:conn.data)
" Call our callbacks.
for l:response in l:response_list
if has_key(a:conn, 'callback')
call ale#util#GetFunction(a:conn.callback)(l:response)
endif
endfor
endfunction
function! s:HandleChannelMessage(channel, message) abort
let l:info = ch_info(a:channel)
let l:address = l:info.hostname . l:info.address
let l:conn = s:FindConnection('id', l:address)
call ale#lsp#HandleMessage(l:conn, a:message)
endfunction
function! s:HandleCommandMessage(job_id, message) abort
let l:conn = s:FindConnection('id', a:job_id)
call ale#lsp#HandleMessage(l:conn, a:message)
endfunction
" Start a program for LSP servers which run with executables.
"
" The job ID will be returned for for the program if it ran, otherwise
" 0 will be returned.
function! ale#lsp#StartProgram(executable, command, callback) abort
if !executable(a:executable)
return 0
endif
let l:conn = s:FindConnection('executable', a:executable)
" Get the current connection or a new one.
let l:conn = !empty(l:conn) ? l:conn : s:NewConnection()
let l:conn.executable = a:executable
if !has_key(l:conn, 'id') || !ale#job#IsRunning(l:conn.id)
let l:options = {
\ 'mode': 'raw',
\ 'out_cb': function('s:HandleCommandMessage'),
\}
let l:job_id = ale#job#Start(a:command, l:options)
else
let l:job_id = l:conn.id
endif
if l:job_id <= 0
return 0
endif
let l:conn.id = l:job_id
let l:conn.callback = a:callback
return l:job_id
endfunction
" Connect to an address and set up a callback for handling responses.
function! ale#lsp#ConnectToAddress(address, callback) abort
let l:conn = s:FindConnection('id', a:address)
" Get the current connection or a new one.
let l:conn = !empty(l:conn) ? l:conn : s:NewConnection()
if !has_key(l:conn, 'channel') || ch_status(l:conn.channel) !=# 'open'
let l:conn.channnel = ch_open(a:address, {
\ 'mode': 'raw',
\ 'waittime': 0,
\ 'callback': function('s:HandleChannelMessage'),
\})
endif
if ch_status(l:conn.channnel) ==# 'fail'
return 0
endif
let l:conn.id = a:address
let l:conn.callback = a:callback
return 1
endfunction
" Send a message to an LSP server.
" Notifications do not need to be handled.
"
" Returns -1 when a message is sent, but no response is expected
" 0 when the message is not sent and
" >= 1 with the message ID when a response is expected.
function! ale#lsp#Send(conn_id, message) abort
let l:conn = s:FindConnection('id', a:conn_id)
let [l:id, l:data] = ale#lsp#CreateMessageData(a:message)
if has_key(l:conn, 'executable')
call ale#job#SendRaw(l:conn.id, l:data)
elseif has_key(l:conn, 'channel') && ch_status(l:conn.channnel) ==# 'open'
" Send the message to the server
call ch_sendraw(l:conn.channel, l:data)
else
return 0
endif
return l:id == 0 ? -1 : l:id
endfunction
function! ale#lsp#OpenTSServerDocumentIfNeeded(conn_id, buffer) abort
let l:conn = s:FindConnection('id', a:conn_id)
let l:opened = 0
if !empty(l:conn) && index(l:conn.open_documents, a:buffer) < 0
call ale#lsp#Send(a:conn_id, ale#lsp#tsserver_message#Open(a:buffer))
call add(l:conn.open_documents, a:buffer)
let l:opened = 1
endif
return l:opened
endfunction
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