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local a = vim.api
local Parser = {}
Parser.__index = Parser
function Parser:parse_tree(force)
if self.valid and not force then
return self.tree
end
self.tree = self._parser:parse_buf(self.bufnr)
self.valid = true
return self.tree
end
local function change_cb(self, ev, bufnr, tick, start_row, oldstopline, stop_row)
local start_byte = a.nvim_buf_get_offset(bufnr,start_row)
-- a bit messy, should we expose edited but not reparsed tree?
-- are multiple edits safe in general?
local root = self._parser:tree():root()
-- TODO: add proper lookup function!
local inode = root:descendant_for_point_range(oldstopline+9000,0, oldstopline,0)
if inode == nil then
local stop_byte = a.nvim_buf_get_offset(bufnr,stop_row)
self._parser:edit(start_byte,stop_byte,stop_byte,start_row,0,stop_row,0,stop_row,0)
else
local fakeoldstoprow, fakeoldstopcol, fakebyteoldstop = inode:start()
local fake_rows = fakeoldstoprow-oldstopline
local fakestop = stop_row+fake_rows
local fakebytestop = a.nvim_buf_get_offset(bufnr,fakestop)+fakeoldstopcol
self._parser:edit(start_byte,fakebyteoldstop,fakebytestop,start_row,0,fakeoldstoprow,fakeoldstopcol,fakestop,fakeoldstopcol)
end
self.valid = false
end
local function create_parser(bufnr, ft)
if bufnr == 0 then
bufnr = a.nvim_get_current_buf()
end
if ft == nil then
ft = a.nvim_buf_get_option(bufnr, "filetype")
end
local self = setmetatable({bufnr=bufnr, valid=false}, Parser)
self._parser = vim._create_ts_parser(ft)
self:parse_tree()
local function cb(ev, ...)
-- TODO: use weakref to self, so that the parser is free'd is no plugin is
-- using it.
return change_cb(self, ev, ...)
end
a.nvim_buf_attach(self.bufnr, false, {on_lines=cb})
return self
end
-- TODO: weak table with reusable parser per buffer.
return {create_parser=create_parser, add_language=vim._ts_add_language}
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