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local a = vim.api
-- TODO(bfredl): currently we retain parsers for the lifetime of the buffer.
-- Consider use weak references to release parser if all plugins are done with
-- it.
local parsers = {}
local Parser = {}
Parser.__index = Parser
function Parser:parse()
if self.valid then
return self.tree
end
self.tree = self._parser:parse_buf(self.bufnr)
self.valid = true
return self.tree
end
function Parser:_on_lines(bufnr, _, start_row, old_stop_row, stop_row, old_byte_size)
local start_byte = a.nvim_buf_get_offset(bufnr,start_row)
local stop_byte = a.nvim_buf_get_offset(bufnr,stop_row)
local old_stop_byte = start_byte + old_byte_size
self._parser:edit(start_byte,old_stop_byte,stop_byte,
start_row,0,old_stop_row,0,stop_row,0)
self.valid = false
end
local module = {
add_language=vim._ts_add_language,
inspect_language=vim._ts_inspect_language,
}
function module.create_parser(bufnr, ft, id)
if bufnr == 0 then
bufnr = a.nvim_get_current_buf()
end
local self = setmetatable({bufnr=bufnr, valid=false}, Parser)
self._parser = vim._create_ts_parser(ft)
self:parse()
-- TODO(bfredl): use weakref to self, so that the parser is free'd is no plugin is
-- using it.
local function lines_cb(_, ...)
return self:_on_lines(...)
end
local detach_cb = nil
if id ~= nil then
detach_cb = function()
if parsers[id] == self then
parsers[id] = nil
end
end
end
a.nvim_buf_attach(self.bufnr, false, {on_lines=lines_cb, on_detach=detach_cb})
return self
end
function module.get_parser(bufnr, ft)
if bufnr == nil or bufnr == 0 then
bufnr = a.nvim_get_current_buf()
end
if ft == nil then
ft = a.nvim_buf_get_option(bufnr, "filetype")
end
local id = tostring(bufnr)..'_'..ft
if parsers[id] == nil then
parsers[id] = module.create_parser(bufnr, ft, id)
end
return parsers[id]
end
return module
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