mirror of
https://github.com/neovim/neovim.git
synced 2024-12-20 03:05:11 -07:00
3dfb9e6f60
**Problem:** Currently, it is difficult to get node(s)-level metadata
for a capture returned by `get_captures_at_pos()`. This is because it is
stored in `metadata[id]` and we do not have access to the value of `id`,
so to get this value we have to iterate over the keys of `metadata`. See
[this commit](d636229300 (diff-8bd4742121c2f359d0345f3c6c253a58220f1a28670cc4e1c957992232059a6cR16)).
Things would be much simpler if we were given the `id` of the capture so
we could use it to just index `metadata` directly.
**Solution:** Include `id` in the data returned by
`get_captures_at_pos()`
471 lines
14 KiB
Lua
471 lines
14 KiB
Lua
local api = vim.api
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---@type table<integer,vim.treesitter.LanguageTree>
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local parsers = setmetatable({}, { __mode = 'v' })
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local M = vim._defer_require('vim.treesitter', {
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_fold = ..., --- @module 'vim.treesitter._fold'
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_query_linter = ..., --- @module 'vim.treesitter._query_linter'
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_range = ..., --- @module 'vim.treesitter._range'
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dev = ..., --- @module 'vim.treesitter.dev'
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highlighter = ..., --- @module 'vim.treesitter.highlighter'
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language = ..., --- @module 'vim.treesitter.language'
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languagetree = ..., --- @module 'vim.treesitter.languagetree'
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query = ..., --- @module 'vim.treesitter.query'
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})
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local LanguageTree = M.languagetree
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--- @nodoc
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M.language_version = vim._ts_get_language_version()
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--- @nodoc
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M.minimum_language_version = vim._ts_get_minimum_language_version()
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--- Creates a new parser
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---
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--- It is not recommended to use this; use |get_parser()| instead.
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---
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---@param bufnr integer Buffer the parser will be tied to (0 for current buffer)
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---@param lang string Language of the parser
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---@param opts (table|nil) Options to pass to the created language tree
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---
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---@return vim.treesitter.LanguageTree object to use for parsing
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function M._create_parser(bufnr, lang, opts)
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bufnr = vim._resolve_bufnr(bufnr)
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vim.fn.bufload(bufnr)
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local self = LanguageTree.new(bufnr, lang, opts)
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local function bytes_cb(_, ...)
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self:_on_bytes(...)
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end
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local function detach_cb(_, ...)
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if parsers[bufnr] == self then
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parsers[bufnr] = nil
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end
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self:_on_detach(...)
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end
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local function reload_cb(_)
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self:_on_reload()
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end
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local source = self:source() --[[@as integer]]
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api.nvim_buf_attach(
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source,
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false,
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{ on_bytes = bytes_cb, on_detach = detach_cb, on_reload = reload_cb, preview = true }
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)
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self:parse()
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return self
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end
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local function valid_lang(lang)
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return lang and lang ~= ''
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end
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--- Returns the parser for a specific buffer and attaches it to the buffer
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---
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--- If needed, this will create the parser.
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---
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--- If no parser can be created, an error is thrown. Set `opts.error = false` to suppress this and
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--- return nil (and an error message) instead. WARNING: This behavior will become default in Nvim
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--- 0.12 and the option will be removed.
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---
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---@param bufnr (integer|nil) Buffer the parser should be tied to (default: current buffer)
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---@param lang (string|nil) Language of this parser (default: from buffer filetype)
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---@param opts (table|nil) Options to pass to the created language tree
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---
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---@return vim.treesitter.LanguageTree? object to use for parsing
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---@return string? error message, if applicable
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function M.get_parser(bufnr, lang, opts)
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opts = opts or {}
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local should_error = opts.error == nil or opts.error
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bufnr = vim._resolve_bufnr(bufnr)
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if not valid_lang(lang) then
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lang = M.language.get_lang(vim.bo[bufnr].filetype)
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end
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if not valid_lang(lang) then
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if not parsers[bufnr] then
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local err_msg =
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string.format('Parser not found for buffer %s: language could not be determined', bufnr)
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if should_error then
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error(err_msg)
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end
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return nil, err_msg
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end
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elseif parsers[bufnr] == nil or parsers[bufnr]:lang() ~= lang then
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local parser = vim.F.npcall(M._create_parser, bufnr, lang, opts)
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if not parser then
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local err_msg =
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string.format('Parser could not be created for buffer %s and language "%s"', bufnr, lang)
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if should_error then
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error(err_msg)
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end
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return nil, err_msg
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end
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parsers[bufnr] = parser
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end
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parsers[bufnr]:register_cbs(opts.buf_attach_cbs)
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return parsers[bufnr]
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end
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--- Returns a string parser
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---
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---@param str string Text to parse
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---@param lang string Language of this string
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---@param opts (table|nil) Options to pass to the created language tree
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---
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---@return vim.treesitter.LanguageTree object to use for parsing
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function M.get_string_parser(str, lang, opts)
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vim.validate('str', str, 'string')
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vim.validate('lang', lang, 'string')
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return LanguageTree.new(str, lang, opts)
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end
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--- Determines whether a node is the ancestor of another
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---
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---@param dest TSNode Possible ancestor
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---@param source TSNode Possible descendant
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---
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---@return boolean True if {dest} is an ancestor of {source}
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function M.is_ancestor(dest, source)
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if not (dest and source) then
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return false
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end
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return dest:child_with_descendant(source) ~= nil
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end
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--- Returns the node's range or an unpacked range table
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---
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---@param node_or_range (TSNode | table) Node or table of positions
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---
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---@return integer start_row
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---@return integer start_col
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---@return integer end_row
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---@return integer end_col
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function M.get_node_range(node_or_range)
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if type(node_or_range) == 'table' then
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return unpack(node_or_range)
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else
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return node_or_range:range(false)
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end
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end
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---Get the range of a |TSNode|. Can also supply {source} and {metadata}
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---to get the range with directives applied.
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---@param node TSNode
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---@param source integer|string|nil Buffer or string from which the {node} is extracted
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---@param metadata vim.treesitter.query.TSMetadata|nil
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---@return Range6
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function M.get_range(node, source, metadata)
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if metadata and metadata.range then
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assert(source)
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return M._range.add_bytes(source, metadata.range)
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end
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return { node:range(true) }
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end
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---@param buf integer
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---@param range Range
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---@returns string
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local function buf_range_get_text(buf, range)
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local start_row, start_col, end_row, end_col = M._range.unpack4(range)
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if end_col == 0 then
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if start_row == end_row then
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start_col = -1
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start_row = start_row - 1
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end
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end_col = -1
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end_row = end_row - 1
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end
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local lines = api.nvim_buf_get_text(buf, start_row, start_col, end_row, end_col, {})
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return table.concat(lines, '\n')
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end
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--- Gets the text corresponding to a given node
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---
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---@param node TSNode
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---@param source (integer|string) Buffer or string from which the {node} is extracted
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---@param opts (table|nil) Optional parameters.
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--- - metadata (table) Metadata of a specific capture. This would be
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--- set to `metadata[capture_id]` when using |vim.treesitter.query.add_directive()|.
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---@return string
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function M.get_node_text(node, source, opts)
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opts = opts or {}
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local metadata = opts.metadata or {}
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if metadata.text then
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return metadata.text
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elseif type(source) == 'number' then
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local range = M.get_range(node, source, metadata)
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return buf_range_get_text(source, range)
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end
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---@cast source string
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return source:sub(select(3, node:start()) + 1, select(3, node:end_()))
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end
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--- Determines whether (line, col) position is in node range
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---
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---@param node TSNode defining the range
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---@param line integer Line (0-based)
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---@param col integer Column (0-based)
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---
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---@return boolean True if the position is in node range
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function M.is_in_node_range(node, line, col)
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return M.node_contains(node, { line, col, line, col + 1 })
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end
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--- Determines if a node contains a range
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---
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---@param node TSNode
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---@param range table
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---
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---@return boolean True if the {node} contains the {range}
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function M.node_contains(node, range)
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-- allow a table so nodes can be mocked
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vim.validate('node', node, { 'userdata', 'table' })
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vim.validate('range', range, M._range.validate, 'integer list with 4 or 6 elements')
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return M._range.contains({ node:range() }, range)
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end
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--- Returns a list of highlight captures at the given position
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---
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--- Each capture is represented by a table containing the capture name as a string, the capture's
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--- language, a table of metadata (`priority`, `conceal`, ...; empty if none are defined), and the
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--- id of the capture.
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---
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---@param bufnr integer Buffer number (0 for current buffer)
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---@param row integer Position row
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---@param col integer Position column
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---
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---@return {capture: string, lang: string, metadata: vim.treesitter.query.TSMetadata, id: integer}[]
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function M.get_captures_at_pos(bufnr, row, col)
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bufnr = vim._resolve_bufnr(bufnr)
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local buf_highlighter = M.highlighter.active[bufnr]
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if not buf_highlighter then
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return {}
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end
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local matches = {}
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buf_highlighter.tree:for_each_tree(function(tstree, tree)
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if not tstree then
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return
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end
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local root = tstree:root()
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local root_start_row, _, root_end_row, _ = root:range()
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-- Only worry about trees within the line range
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if root_start_row > row or root_end_row < row then
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return
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end
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local q = buf_highlighter:get_query(tree:lang())
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-- Some injected languages may not have highlight queries.
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if not q:query() then
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return
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end
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local iter = q:query():iter_captures(root, buf_highlighter.bufnr, row, row + 1)
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for id, node, metadata in iter do
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if M.is_in_node_range(node, row, col) then
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---@diagnostic disable-next-line: invisible
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local capture = q._query.captures[id] -- name of the capture in the query
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if capture ~= nil then
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table.insert(
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matches,
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{ capture = capture, metadata = metadata, lang = tree:lang(), id = id }
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)
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end
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end
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end
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end)
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return matches
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end
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--- Returns a list of highlight capture names under the cursor
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---
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---@param winnr (integer|nil) Window handle or 0 for current window (default)
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---
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---@return string[] List of capture names
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function M.get_captures_at_cursor(winnr)
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winnr = winnr or 0
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local bufnr = api.nvim_win_get_buf(winnr)
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local cursor = api.nvim_win_get_cursor(winnr)
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local data = M.get_captures_at_pos(bufnr, cursor[1] - 1, cursor[2])
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local captures = {}
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for _, capture in ipairs(data) do
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table.insert(captures, capture.capture)
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end
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return captures
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end
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--- Optional keyword arguments:
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--- @class vim.treesitter.get_node.Opts : vim.treesitter.LanguageTree.tree_for_range.Opts
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--- @inlinedoc
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---
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--- Buffer number (nil or 0 for current buffer)
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--- @field bufnr integer?
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---
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--- 0-indexed (row, col) tuple. Defaults to cursor position in the
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--- current window. Required if {bufnr} is not the current buffer
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--- @field pos [integer, integer]?
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---
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--- Parser language. (default: from buffer filetype)
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--- @field lang string?
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---
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--- Ignore injected languages (default true)
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--- @field ignore_injections boolean?
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---
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--- Include anonymous nodes (default false)
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--- @field include_anonymous boolean?
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--- Returns the smallest named node at the given position
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---
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--- NOTE: Calling this on an unparsed tree can yield an invalid node.
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--- If the tree is not known to be parsed by, e.g., an active highlighter,
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--- parse the tree first via
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---
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--- ```lua
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--- vim.treesitter.get_parser(bufnr):parse(range)
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--- ```
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---
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---@param opts vim.treesitter.get_node.Opts?
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---
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---@return TSNode | nil Node at the given position
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function M.get_node(opts)
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opts = opts or {}
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local bufnr = vim._resolve_bufnr(opts.bufnr)
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local row, col --- @type integer, integer
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if opts.pos then
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assert(#opts.pos == 2, 'Position must be a (row, col) tuple')
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row, col = opts.pos[1], opts.pos[2]
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else
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assert(
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bufnr == api.nvim_get_current_buf(),
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'Position must be explicitly provided when not using the current buffer'
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)
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local pos = api.nvim_win_get_cursor(0)
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-- Subtract one to account for 1-based row indexing in nvim_win_get_cursor
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row, col = pos[1] - 1, pos[2]
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end
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assert(row >= 0 and col >= 0, 'Invalid position: row and col must be non-negative')
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local ts_range = { row, col, row, col }
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local root_lang_tree = M.get_parser(bufnr, opts.lang, { error = false })
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if not root_lang_tree then
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return
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end
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if opts.include_anonymous then
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return root_lang_tree:node_for_range(ts_range, opts)
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end
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return root_lang_tree:named_node_for_range(ts_range, opts)
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end
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--- Starts treesitter highlighting for a buffer
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---
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--- Can be used in an ftplugin or FileType autocommand.
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---
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--- Note: By default, disables regex syntax highlighting, which may be required for some plugins.
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--- In this case, add `vim.bo.syntax = 'on'` after the call to `start`.
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---
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--- Example:
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---
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--- ```lua
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--- vim.api.nvim_create_autocmd( 'FileType', { pattern = 'tex',
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--- callback = function(args)
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--- vim.treesitter.start(args.buf, 'latex')
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--- vim.bo[args.buf].syntax = 'on' -- only if additional legacy syntax is needed
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--- end
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--- })
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--- ```
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---
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---@param bufnr (integer|nil) Buffer to be highlighted (default: current buffer)
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---@param lang (string|nil) Language of the parser (default: from buffer filetype)
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function M.start(bufnr, lang)
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bufnr = vim._resolve_bufnr(bufnr)
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local parser = assert(M.get_parser(bufnr, lang, { error = false }))
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M.highlighter.new(parser)
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end
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--- Stops treesitter highlighting for a buffer
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---
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---@param bufnr (integer|nil) Buffer to stop highlighting (default: current buffer)
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function M.stop(bufnr)
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bufnr = vim._resolve_bufnr(bufnr)
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if M.highlighter.active[bufnr] then
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M.highlighter.active[bufnr]:destroy()
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end
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end
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--- Open a window that displays a textual representation of the nodes in the language tree.
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---
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--- While in the window, press "a" to toggle display of anonymous nodes, "I" to toggle the
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--- display of the source language of each node, "o" to toggle the query editor, and press
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--- [<Enter>] to jump to the node under the cursor in the source buffer. Folding also works
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--- (try |zo|, |zc|, etc.).
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---
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--- Can also be shown with `:InspectTree`. [:InspectTree]()
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---
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---@since 11
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---@param opts table|nil Optional options table with the following possible keys:
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--- - lang (string|nil): The language of the source buffer. If omitted, detect
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--- from the filetype of the source buffer.
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--- - bufnr (integer|nil): Buffer to draw the tree into. If omitted, a new
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--- buffer is created.
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--- - winid (integer|nil): Window id to display the tree buffer in. If omitted,
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--- a new window is created with {command}.
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--- - command (string|nil): Vimscript command to create the window. Default
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--- value is "60vnew". Only used when {winid} is nil.
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--- - title (string|fun(bufnr:integer):string|nil): Title of the window. If a
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--- function, it accepts the buffer number of the source buffer as its only
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--- argument and should return a string.
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function M.inspect_tree(opts)
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---@diagnostic disable-next-line: invisible
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M.dev.inspect_tree(opts)
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end
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--- Returns the fold level for {lnum} in the current buffer. Can be set directly to 'foldexpr':
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---
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--- ```lua
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--- vim.wo.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
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--- ```
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---
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---@since 11
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---@param lnum integer|nil Line number to calculate fold level for
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---@return string
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function M.foldexpr(lnum)
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return M._fold.foldexpr(lnum)
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end
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return M
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