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local a = vim.api
function parse_tree(tsstate, force)
if tsstate.valid and not force then
return tsstate.tree
end
tsstate.tree = tsstate.parser:parse_buf(tsstate.bufnr)
tsstate.valid = true
return tsstate.tree
end
local function change_cb(tsstate, 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 = tsstate.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)
tsstate.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
tsstate.parser:edit(start_byte,fakebyteoldstop,fakebytestop,start_row,0,fakeoldstoprow,fakeoldstopcol,fakestop,fakeoldstopcol)
end
tsstate.valid = false
end
function create_parser(bufnr)
if bufnr == 0 then
bufnr = a.nvim_get_current_buf()
end
local ft = a.nvim_buf_get_option(bufnr, "filetype")
local tsstate = {}
tsstate.bufnr = bufnr
tsstate.parser = vim.ts_parser(ft.."_parser.so", ft)
parse_tree(tsstate)
local function cb(ev, ...)
return change_cb(tsstate, ev, ...)
end
a.nvim_buf_attach(tsstate.bufnr, false, {on_lines=cb})
return tsstate
end
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