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local a = vim.api
-- 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 = {}
local Parser = {}
Parser.__index = Parser
function Parser:parse()
if self.valid then
return self.tree
end
local changes
self.tree, changes = self._parser:parse_buf(self.bufnr)
self.valid = true
for _, cb in ipairs(self.change_cbs) do
cb(changes)
end
return self.tree, changes
end
function Parser:_on_lines(bufnr, _, start_row, old_stop_row, stop_row, old_byte_size)
local start_byte = a.nvim_buf_get_offset(bufnr,start_row)
local stop_byte = a.nvim_buf_get_offset(bufnr,stop_row)
local old_stop_byte = start_byte + old_byte_size
self._parser:edit(start_byte,old_stop_byte,stop_byte,
start_row,0,old_stop_row,0,stop_row,0)
self.valid = false
end
local M = {
add_language=vim._ts_add_language,
inspect_language=vim._ts_inspect_language,
parse_query = vim._ts_parse_query,
}
setmetatable(M, {
__index = function (t, k)
if k == "TSHighlighter" then
t[k] = require'vim.tshighlighter'
return t[k]
end
end
})
function M.create_parser(bufnr, ft, id)
if bufnr == 0 then
bufnr = a.nvim_get_current_buf()
end
local self = setmetatable({bufnr=bufnr, lang=ft, valid=false}, Parser)
self._parser = vim._create_ts_parser(ft)
self.change_cbs = {}
self:parse()
-- TODO(bfredl): use weakref to self, so that the parser is free'd is no plugin is
-- using it.
local function lines_cb(_, ...)
return self:_on_lines(...)
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
function M.get_parser(bufnr, ft, cb)
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 id = tostring(bufnr)..'_'..ft
if parsers[id] == nil then
parsers[id] = M.create_parser(bufnr, ft, id)
end
if cb ~= nil then
table.insert(parsers[id].change_cbs, cb)
end
return parsers[id]
end
-- query: pattern matching on trees
-- predicate matching is implemented in lua
local Query = {}
Query.__index = Query
function M.parse_query(lang, query)
local self = setmetatable({}, Query)
self.query = vim._ts_parse_query(lang, query)
self.info = self.query:inspect()
self.captures = self.info.captures
return self
end
local function get_node_text(node, bufnr)
local start_row, start_col, end_row, end_col = node:range()
if start_row ~= end_row then
return nil
end
local line = a.nvim_buf_get_lines(bufnr, start_row, start_row+1, true)[1]
return string.sub(line, start_col+1, end_col)
end
local function match_preds(match, preds, bufnr)
for _, pred in pairs(preds) do
if pred[1] == "eq?" then
local node = match[pred[2]]
local node_text = get_node_text(node, bufnr)
local str
if type(pred[3]) == "string" then
-- (eq? @aa "foo")
str = pred[3]
else
-- (eq? @aa @bb)
str = get_node_text(match[pred[3]], bufnr)
end
if node_text ~= str or str == nil then
return false
end
else
return false
end
end
return true
end
function Query:iter_captures(node, bufnr, start, stop)
if bufnr == 0 then
bufnr = vim.api.nvim_get_current_buf()
end
local raw_iter = node:_rawquery(self.query,true,start,stop)
local function iter()
local capture, captured_node, match = raw_iter()
if match ~= nil then
local preds = self.info.patterns[match.pattern]
local active = match_preds(match, preds, bufnr)
match.active = active
if not active then
return iter() -- tail call: try next match
end
end
return capture, captured_node
end
return iter
end
function Query:iter_matches(node, bufnr, start, stop)
if bufnr == 0 then
bufnr = vim.api.nvim_get_current_buf()
end
local raw_iter = node:_rawquery(self.query,false,start,stop)
local function iter()
local pattern, match = raw_iter()
if match ~= nil then
local preds = self.info.patterns[pattern]
local active = (not preds) or match_preds(match, preds, bufnr)
if not active then
return iter() -- tail call: try next match
end
end
return pattern, match
end
return iter
end
return M
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