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tree-sitter: improve parser API (shared parser between plugins)

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Björn Linse
2019-06-17 21:46:31 +02:00
parent d697841a9d
commit 167a1cfdef
2 changed files with 69 additions and 21 deletions
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63
runtime/lua/vim/treesitter.lua
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@@ -3,8 +3,13 @@ local a = vim.api
local Parser = {}
Parser.__index = Parser
function Parser:parse_tree(force)
if self.valid and not force then
-- 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 = {}
function Parser:parse()
if self.valid then
return self.tree
end
self.tree = self._parser:parse_buf(self.bufnr)
@@ -12,7 +17,7 @@ function Parser:parse_tree(force)
return self.tree
end
local function change_cb(self, ev, bufnr, tick, start_row, oldstopline, stop_row)
local function on_lines(self, bufnr, _, 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?
@@ -21,41 +26,63 @@ local function change_cb(self, ev, bufnr, tick, start_row, oldstopline, stop_row
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)
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)
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)
local function 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: use weakref to self, so that the parser is free'd is no plugin is
-- using it.
local function lines_cb(ev, ...)
return on_lines(self, ...)
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
local function 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 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, ...)
local id = tostring(bufnr)..'_'..ft
if parsers[id] == nil then
parsers[id] = create_parser(bufnr, ft, id)
end
a.nvim_buf_attach(self.bufnr, false, {on_lines=cb})
return self
return parsers[id]
end
-- TODO: weak table with reusable parser per buffer.
return {
get_parser=get_parser,
create_parser=create_parser,
add_language=vim._ts_add_language,
inspect_language=vim._ts_inspect_language,
}