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-- Copyright (c) 2021 Florian Fischer. All rights reserved.
-- This file is part of vis-lspc.
-- vis-lspc is free software: you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation, either version 3 of the License, or (at your option) any later
-- version.
-- vis-lspc is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-- You should have received a copy of the GNU General Public License along with
-- vis-lspc found in the LICENSE file. If not, see <https://www.gnu.org/licenses/>.
-- vis-lspc default bindings
-- Parse the data send by a language server
-- Note the chunks received may not end with the end of a message.
-- In the worst case a data chunk contains two partial messages on at the beginning
-- and one at the end
local function add(p, data)
p.data = p.data .. data
-- we have not seen a complete header in data yet
if not p.exp_len then
-- search for the end of a header
-- LSP message format: 'header\r\n\r\nbody'
local header_end, content_start = p.data:find('\r\n\r\n')
-- header is not complete yet -> save data and wait for more
if not header_end then
return
end
-- got a complete header
local header = p.data:sub(1, header_end)
-- extract content length from the header
p.exp_len = tonumber(header:match('%d+'))
if not p.exp_len then
return 'invalid header in data: ' .. p.data
end
-- consume header from data
p.data = p.data:sub(content_start + 1)
end
local data_avail = string.len(p.data)
-- we have no complete message yet -> await more data
if p.exp_len > data_avail then
return
end
local complete_msg = p.data:sub(1, p.exp_len)
table.insert(p.msgs, complete_msg)
-- consume complete_msg from data
p.data = p.data:sub(p.exp_len + 1)
local leftover = data_avail - p.exp_len
-- reset exp_len to search for a new header
p.exp_len = nil
if leftover > 0 then
return p:add('')
end
end
local function get_msgs(p)
local msgs = p.msgs
p.msgs = {}
return msgs
end
local function Parser()
local parser = {
add = add,
get_msgs = get_msgs,
exp_len = nil,
data = '',
msgs = {},
}
return parser
end
return {Parser = Parser}
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