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local parsers = require'nvim-treesitter.parsers'
local queries = require'nvim-treesitter.query'
local tsutils = require'nvim-treesitter.ts_utils'
local TSHighlighter = require'vim.treesitter.highlighter'
local ns = vim.api.nvim_create_namespace("treesitter/highlighter")
local LanguageTree = {}
LanguageTree.__index = LanguageTree
local trees = { }
function LanguageTree.new(bufnr, lang, not_root)
local buf
if not bufnr or bufnr == 0 then
buf = vim.api.nvim_get_current_buf()
else
buf = bufnr
end
local parser = parsers.get_parser(buf, parsers.ft_to_lang(lang))
if not parser then return end
local query = queries.get_query(lang, "highlights")
if not query then return end
local self = setmetatable(
{
highlighter = TSHighlighter.new(parser, query),
parser = parser,
children = {}
},
LanguageTree)
if not not_root then
trees[buf] = self
self.parser:register_cbs{
on_bytes = function() self:update() end
}
end
-- First setup
self:update()
return self
end
function LanguageTree:add_child(lang, child)
if not vim.tbl_contains(self.children, child) then
table.insert(self.children, child)
end
end
function LanguageTree:remove_child(lang)
self.children[lang] = nil
end
function LanguageTree:node_for_range(range)
for _, child in pairs(self.children) do
if child:contains(range) then
return child:node_for_range(range)
end
end
end
function LanguageTree:nodes_for_line(range, result)
result = result or {}
if self:contains(range, true) then
table.insert(result, self)
end
for _, child in pairs(self.children) do
if child:contains(range, true) then
child:nodes_for_line(range, result)
end
end
return result
end
local function range_contains_line(source, dest)
return source[1] <= dest[1] and source[3] >= dest[3]
end
local function range_contains(source, dest)
local start_fits = source[1] < dest[1] or (source[1] == dest[1] and source[2] <= dest[2])
local end_fits = source[3] > dest[3] or (source[3] == dest[3] and source[4] >= dest[4])
return start_fits and end_fits
end
function LanguageTree:contains(range, line_only)
for _, source in pairs(self.parser:included_ranges()) do
local contains_fn = line_only and range_contains_line or range_contains
if contains_fn(source, range) then
return true
end
end
return false
end
function LanguageTree:update()
local query = queries.get_query(self.parser.lang, "injections")
if not query then return end
local root = self.parser:parse():root()
local startl, _, stopl, _ = root:range()
local injections = {}
-- Find injections
for inj in queries.iter_prepared_matches(query, root, self.parser.bufnr, startl, stopl+1) do
local lang = inj.lang
if type(lang) ~= "string" then
lang = tsutils.get_node_text(lang.node, self.parser.bufnr)[1]
end
if not lang or not inj.injection.node then
vim.api.nvim_err_writeln("Invalid match encountered")
return nil
end
if not injections[lang] then
injections[lang] = {}
end
table.insert(injections[lang], inj.injection.node)
end
local seen = {}
-- Update each child accordingly
-- TODO(vigoux): for now avoid languages that include themselves, will
-- be fixed when managing our own parsers
for lang, ranges in pairs(injections) do
if lang ~= self.parser.lang then
if not self.children[lang] then
self.children[lang] = LanguageTree.new(self.parser.bufnr, lang, true)
end
if self.children[lang] then
self.children[lang].parser:set_included_ranges(ranges)
self.children[lang]:update()
seen[lang] = true
end
end
end
-- Clean up unused parsers
for lang, _ in pairs(self.children) do
if not seen[lang] then
self:remove_child(lang)
end
end
end
function LanguageTree._on_line(_, _win, buf, line)
local tree = trees[buf]
if not tree then return end
local line_len = #(vim.api.nvim_buf_get_lines(buf, line, line + 1, false)[1])
local matches = tree:nodes_for_line { line, 0, line, line_len } -- TODO proper search here
-- Matches are from least specific to most specific range (parent -> child)
for _, match in ipairs(matches) do
TSHighlighter._on_line("line", _win, buf, line, match.highlighter)
end
end
vim.api.nvim_set_decoration_provider(ns, {
on_buf = TSHighlighter._on_buf;
on_win = TSHighlighter._on_win;
on_line = LanguageTree._on_line;
})
return LanguageTree
|
