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local a = vim.api
-- support reload for quick experimentation
local TSHighlighter = rawget(vim.treesitter, 'TSHighlighter') or {}
TSHighlighter.__index = TSHighlighter
-- These are conventions defined by tree-sitter, though it
-- needs to be user extensible also.
-- TODO(bfredl): this is very much incomplete, we will need to
-- go through a few tree-sitter provided queries and decide
-- on translations that makes the most sense.
TSHighlighter.hl_map = {
keyword="Keyword",
string="String",
type="Type",
comment="Comment",
constant="Constant",
operator="Operator",
number="Number",
label="Label",
["function"]="Function",
["function.special"]="Function",
}
function TSHighlighter.new(query, bufnr, ft)
local self = setmetatable({}, TSHighlighter)
self.parser = vim.treesitter.get_parser(bufnr, ft, function(...) self:on_change(...) end)
self.buf = self.parser.bufnr
-- TODO(bfredl): perhaps on_start should be called uncondionally, instead for only on mod?
local tree = self.parser:parse()
self.root = tree:root()
self:set_query(query)
self.edit_count = 0
self.redraw_count = 0
self.line_count = {}
a.nvim_buf_set_option(self.buf, "syntax", "")
a.nvim__buf_set_luahl(self.buf, {
on_start=function(...) return self:on_start(...) end,
on_window=function(...) return self:on_window(...) end,
on_line=function(...) return self:on_line(...) end,
})
-- Tricky: if syntax hasn't been enabled, we need to reload color scheme
-- but use synload.vim rather than syntax.vim to not enable
-- syntax FileType autocmds. Later on we should integrate with the
-- `:syntax` and `set syntax=...` machinery properly.
if vim.g.syntax_on ~= 1 then
vim.api.nvim_command("runtime! syntax/synload.vim")
end
return self
end
function TSHighlighter:set_query(query)
if type(query) == "string" then
query = vim.treesitter.parse_query(self.parser.lang, query)
end
self.query = query
self.id_map = {}
for i, capture in ipairs(self.query.captures) do
local hl = 0
local firstc = string.sub(capture, 1, 1)
local hl_group = self.hl_map[capture]
if firstc ~= string.lower(firstc) then
hl_group = vim.split(capture, '.', true)[1]
end
if hl_group then
hl = a.nvim_get_hl_id_by_name(hl_group)
end
self.id_map[i] = hl
end
a.nvim__buf_redraw_range(self.buf, 0, a.nvim_buf_line_count(self.buf))
end
function TSHighlighter:on_change(changes)
for _, ch in ipairs(changes or {}) do
a.nvim__buf_redraw_range(self.buf, ch[1], ch[3]+1)
end
self.edit_count = self.edit_count + 1
end
function TSHighlighter:on_start(_, _buf, _tick)
local tree = self.parser:parse()
self.root = tree:root()
end
function TSHighlighter:on_window(_, _win, _buf, _topline, botline)
self.iter = nil
self.nextrow = 0
self.botline = botline
self.redraw_count = self.redraw_count + 1
end
function TSHighlighter:on_line(_, _win, buf, line)
if self.iter == nil then
self.iter = self.query:iter_captures(self.root,buf,line,self.botline)
end
while line >= self.nextrow do
local capture, node, match = self.iter()
local active = true
if capture == nil then
break
end
if match ~= nil then
active = self:run_pred(match)
match.active = active
end
local start_row, start_col, end_row, end_col = node:range()
local hl = self.id_map[capture]
if hl > 0 and active and end_row >= line then
a.nvim__put_attr(hl, start_row, start_col, end_row, end_col)
end
if start_row > line then
self.nextrow = start_row
end
end
self.line_count[line] = (self.line_count[line] or 0) + 1
--return tostring(self.line_count[line])
end
return TSHighlighter
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