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2061 lines (1820 loc) · 84.4 KB
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--- *mini.ai* Extend and create a/i textobjects
--- *MiniAi*
---
--- MIT License Copyright (c) 2022 Evgeni Chasnovski
---
--- ==============================================================================
---
--- Enhance some builtin |text-objects| (like |a(|, |a)|, |a'|, and more),
--- create new ones (like `a*`, `a<Space>`, `af`, `a?`, and more), and allow
--- user to create their own.
---
--- Features:
--- - Customizable creation of `a`/`i` textobjects using Lua patterns and functions.
--- Supports:
--- - Dot-repeat.
--- - |v:count|.
--- - Different search methods (see |MiniAi.config|).
--- - Consecutive application (update selection without leaving Visual mode).
--- - Aliases for multiple textobjects.
---
--- - Comprehensive builtin textobjects (see more in |MiniAi-textobject-builtin|):
--- - Balanced brackets (with and without whitespace) plus alias.
--- - Balanced quotes plus alias.
--- - Function call.
--- - Argument.
--- - Tag.
--- - Derived from user prompt.
--- - Default for punctuation, digit, space, or tab.
---
--- For more textobjects see |MiniExtra.gen_ai_spec|.
---
--- - Motions for jumping to left/right edge of textobject.
---
--- - Set of specification generators to tweak some builtin textobjects (see
--- |MiniAi.gen_spec|).
---
--- - Treesitter textobjects (through |MiniAi.gen_spec.treesitter()| helper).
---
--- This module works by defining mappings for both `a` and `i` in Visual and
--- Operator-pending mode. After typing, they wait for single character user input
--- treated as textobject identifier and apply resolved textobject specification
--- (fall back to other mappings if can't find proper textobject id). For more
--- information see |MiniAi-textobject-specification| and |MiniAi-algorithm|.
---
--- Known issues which won't be resolved:
--- - Search for builtin textobjects is done mostly using Lua patterns
--- (regex-like approach). Certain amount of false positives is to be expected.
---
--- - During search for builtin textobjects there is no distinction if it is
--- inside string or comment. For example, in the following case there will
--- be wrong match for a function call: `f(a = ")", b = 1)`.
---
--- General rule of thumb: any instrument using available parser for document
--- structure (like treesitter) will usually provide more precise results. This
--- module has builtins mostly for plain text textobjects which are useful
--- most of the times (like "inside brackets", "around quotes/underscore", etc.).
--- For advanced use cases define function specification for custom textobjects.
---
--- What it doesn't (and probably won't) do:
--- - Have special operators to specially handle whitespace (like `I` and `A`
--- in 'targets.vim'). Whitespace handling is assumed to be done inside
--- textobject specification (like `i(` and `i)` handle whitespace differently).
---
--- # Setup ~
---
--- This module needs a setup with `require('mini.ai').setup({})` (replace
--- `{}` with your `config` table). It will create global Lua table `MiniAi`
--- which you can use for scripting or manually (with `:lua MiniAi.*`).
---
--- See |MiniAi.config| for available config settings.
---
--- You can override runtime config settings (like `config.custom_textobjects`)
--- locally to buffer inside `vim.b.miniai_config` which should have same structure
--- as `MiniAi.config`. See |mini.nvim-buffer-local-config| for more details.
---
--- To stop module from showing non-error feedback, set `config.silent = true`.
---
--- # Comparisons ~
---
--- - 'wellle/targets.vim':
--- - Has limited support for creating own textobjects: it is constrained
--- to pre-defined detection rules. 'mini.ai' allows creating own rules
--- via Lua patterns and functions (see |MiniAi-textobject-specification|).
--- - Doesn't provide any programmatical API for getting information about
--- textobjects. 'mini.ai' does it via |MiniAi.find_textobject()|.
--- - Has no implementation of "moving to edge of textobject". 'mini.ai'
--- does it via |MiniAi.move_cursor()| and `g[` and `g]` default mappings.
--- - Has elaborate ways to control searching of the next textobject.
--- 'mini.ai' relies on handful of 'config.search_method'.
--- - Implements `A`, `I` operators. 'mini.ai' does not by design: it is
--- assumed to be a property of textobject, not operator.
--- - Doesn't implement "function call" and "user prompt" textobjects.
--- 'mini.ai' does (with `f` and `?` identifiers).
--- - Has limited support for "argument" textobject. Although it works in
--- most situations, it often misdetects commas as argument separator
--- (like if it is inside quotes or `{}`). 'mini.ai' deals with these cases.
--- - 'nvim-treesitter/nvim-treesitter-textobjects':
--- - Along with textobject functionality provides a curated and maintained
--- set of popular textobject queries for many languages (which can power
--- |MiniAi.gen_spec.treesitter()| functionality).
--- - Operates with custom treesitter directives (see
--- |lua-treesitter-directives|) allowing more fine-tuned textobjects.
--- - Implements only textobjects based on treesitter.
--- - Doesn't support |v:count|.
--- - Doesn't support multiple search method (basically, only 'cover').
--- - Doesn't support consecutive application of target textobject.
---
--- # Disabling ~
---
--- To disable, set `vim.g.miniai_disable` (globally) or `vim.b.miniai_disable`
--- (for a buffer) to `true`. Considering high number of different scenarios
--- and customization intentions, writing exact rules for disabling module's
--- functionality is left to user. See |mini.nvim-disabling-recipes| for common
--- recipes.
--- Builtin textobjects ~
---
--- This table describes all builtin textobjects along with what they
--- represent. Explanation:
--- - `Key` represents the textobject identifier: single alphanumeric,
--- punctuation, space, or tab character which should be typed after `a`/`i`.
--- - `Name` is a description of textobject.
--- - `Example line` contains a string for which examples are constructed. The
--- `*` denotes the cursor position.
--- - `a`/`i` describe inclusive region representing `a` and `i` textobjects.
--- Use numbers in separators for easier navigation.
--- - `2a`/`2i` describe either `2a`/`2i` (support for |v:count|) textobjects
--- or `a`/`i` textobject followed by another `a`/`i` textobject (consecutive
--- application leads to incremental selection).
---
--- Example: typing `va)` with cursor on `*` leads to selection from column 2
--- to column 12. Another typing `a)` changes selection to [1; 13]. Also, besides
--- visual selection, any |operator| can be used or `g[`/`g]` motions to move
--- to left/right edge of `a` textobject.
--- >
--- |Key| Name | Example line | a | i | 2a | 2i |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | ( | Balanced () | (( *a (bb) )) | | | | |
--- | [ | Balanced [] | [[ *a [bb] ]] | [2;12] | [4;10] | [1;13] | [2;12] |
--- | { | Balanced {} | {{ *a {bb} }} | | | | |
--- | < | Balanced <> | << *a <bb> >> | | | | |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | ) | Balanced () | (( *a (bb) )) | | | | |
--- | ] | Balanced [] | [[ *a [bb] ]] | | | | |
--- | } | Balanced {} | {{ *a {bb} }} | [2;12] | [3;11] | [1;13] | [2;12] |
--- | > | Balanced <> | << *a <bb> >> | | | | |
--- | b | Alias for | [( *a {bb} )] | | | | |
--- | | ), ], or } | | | | | |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | " | Balanced " | "*a" " bb " | | | | |
--- | ' | Balanced ' | '*a' ' bb ' | | | | |
--- | ` | Balanced ` | `*a` ` bb ` | [1;4] | [2;3] | [6;11] | [7;10] |
--- | q | Alias for | '*a' " bb " | | | | |
--- | | ", ', or ` | | | | | |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | ? | User prompt | e*e o e o o | [3;5] | [4;4] | [7;9] | [8;8] |
--- | |(typed e and o)| | | | | |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | t | Tag | <x><y>*a</y></x> | [4;12] | [7;8] | [1;16] | [4;12] |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | f | Function call | f(a, g(*b, c) ) | [6;13] | [8;12] | [1;15] | [3;14] |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | a | Argument | f(*a, g(b, c) ) | [3;5] | [3;4] | [5;14] | [7;13] |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- | | Default | | | | | |
--- | | (digits, | aa_*b__cc___ | [4;7] | [4;5] | [8;12] | [8;9] |
--- | | punctuation, | (example for _) | | | | |
--- | | or whitespace)| | | | | |
--- |---|---------------|-1234567890123456-|--------|--------|--------|--------|
--- <
--- Notes:
--- - All examples assume default `config.search_method`.
--- - Open brackets differ from close brackets by how they treat inner edge
--- whitespace for `i` textobject: open ignores it, close - includes.
--- - Default textobject is activated for identifiers from digits (0, ..., 9),
--- punctuation (like `_`, `*`, `,`, etc.), whitespace (space, tab, etc.).
--- They are designed to be treated as separators, so include only right edge
--- in `a` textobject. To include both edges, use custom textobjects
--- (see |MiniAi-textobject-specification| and |MiniAi.config|). Note:
--- - When cursor is exactly on the identifier character while there are
--- two matching candidates on both left and right, the resulting region
--- with smaller width is preferred.
---@tag MiniAi-textobject-builtin
--- - REGION - table representing region in a buffer. Fields:
--- - <from> and <to> for inclusive start and end positions (<to> might be
--- `nil` to describe empty region). Each position is also a table with
--- line <line> and column <col> (both start at 1).
--- - <vis_mode> for which Visual mode will be used to select textobject.
--- See `opts` argument of |MiniAi.select_textobject()|.
--- One of `'v'`, `'V'`, `'\22'` (escaped `'<C-v>'`).
--- Examples: >lua
---
--- { from = { line = 1, col = 1 }, to = { line = 2, col = 1 } }
---
--- -- Forced linewise mode
--- {
--- from = { line = 1, col = 1 }, to = { line = 2, col = 1 },
--- vis_mode = 'V',
--- }
---
--- -- Empty region
--- { from = { line = 10, col = 10 } }
--- <
--- - PATTERN - string describing Lua pattern.
--- - SPAN - interval inside a string (end-exclusive). Like [1, 5). Equal
--- `from` and `to` edges describe empty span at that point.
--- - SPAN `A = [a1, a2)` COVERS `B = [b1, b2)` if every element of
--- `B` is within `A` (`a1 <= b < a2`).
--- It also is described as B IS NESTED INSIDE A.
--- - NESTED PATTERN - array of patterns aimed to describe nested spans.
--- - SPAN MATCHES NESTED PATTERN if there is a sequence of consecutively
--- nested spans each matching corresponding pattern within substring of
--- previous span (or input string for first span). Example: >lua
---
--- -- Nested patterns for balanced `()` with inner space
--- { '%b()', '^. .* .$' }
---
--- -- Example input string (with columns underneath for easier reading):
--- "( ( () ( ) ) )"
--- -- 12345678901234
--- <
--- Here are all matching spans [1, 15) and [3, 13). Both [5, 7) and [8, 10)
--- match first pattern but not second. All other combinations of `(` and `)`
--- don't match first pattern (not balanced).
--- - COMPOSED PATTERN: array with each element describing possible pattern
--- (or array of them) at that place. Composed pattern basically defines all
--- possible combinations of nested pattern (their cartesian product).
--- Examples:
--- 1. Either balanced `()` or balanced `[]` but both with inner edge space: >lua
---
--- -- Composed pattern
--- { { '%b()', '%b[]' }, '^. .* .$' }
---
--- -- Composed pattern expanded into equivalent array of nested patterns
--- { '%b()', '^. .* .$' } -- and
--- { '%b[]', '^. .* .$' }
--- <
--- 2. Either "balanced `()` with inner edge space" or "balanced `[]` with
--- no inner edge space", both with 5 or more characters: >lua
---
--- -- Composed pattern
--- { { { '%b()', '^. .* .$' }, { '%b[]', '^.[^ ].*[^ ].$' } }, '.....' }
---
--- -- Composed pattern expanded into equivalent array of nested patterns
--- { '%b()', '^. .* .$', '.....' } -- and
--- { '%b[]', '^.[^ ].*[^ ].$', '.....' }
--- <
--- - SPAN MATCHES COMPOSED PATTERN if it matches at least one nested pattern
--- from expanded composed pattern.
---@tag MiniAi-glossary
--- Textobject specification has a structure of composed pattern (see
--- |MiniAi-glossary|) with two differences:
--- - Last pattern(s) should have even number of empty capture groups denoting
--- how the last string should be processed to extract `a` or `i` textobject:
--- - Zero captures mean that whole string represents both `a` and `i`.
--- Example: `xxx` will define textobject matching string `xxx` literally.
--- - Two captures represent `i` textobject inside of them. `a` - whole string.
--- Example: `x()x()x` defines `a` textobject to be `xxx`, `i` - middle `x`.
--- - Four captures define `a` textobject inside captures 1 and 4, `i` -
--- inside captures 2 and 3. Example: `x()()x()x()` defines `a`
--- textobject to be last `xx`, `i` - middle `x`.
--- - Allows callable objects (see |vim.is_callable()|) in certain places
--- (enables more complex textobjects in exchange of increase in configuration
--- complexity and computations):
--- - If specification itself is a callable, it will be called with the same
--- arguments as |MiniAi.find_textobject()| and should return one of:
--- - Composed pattern. Useful for implementing user input. Example of
--- simplified variant of textobject for function call with name taken
--- from user prompt: >lua
---
--- function()
--- local left_edge = vim.pesc(vim.fn.input('Function name: '))
--- return { left_edge .. '%b()', '^.-%(().*()%)$' }
--- end
--- <
--- - Single output region. Useful to allow full control over
--- textobject. Will be taken as is. Example of returning whole buffer: >lua
---
--- function()
--- local from = { line = 1, col = 1 }
--- local to = {
--- line = vim.fn.line('$'),
--- col = math.max(vim.fn.getline('$'):len(), 1)
--- }
--- return { from = from, to = to, vis_mode = 'V' }
--- end
--- <
--- - Array of output region(s). Useful for incorporating other
--- instruments, like treesitter (see |MiniAi.gen_spec.treesitter()|).
--- The best region will be picked in the same manner as with composed
--- pattern (respecting options `n_lines`, `search_method`, etc.).
--- Example of selecting "best" line with display width more than 80: >lua
---
--- function(_, _, _)
--- local res = {}
--- for i = 1, vim.api.nvim_buf_line_count(0) do
--- local cur_line = vim.fn.getline(i)
--- if vim.fn.strdisplaywidth(cur_line) > 80 then
--- local region = {
--- from = { line = i, col = 1 },
--- to = { line = i, col = cur_line:len() },
--- }
--- table.insert(res, region)
--- end
--- end
--- return res
--- end
--- <
--- - If there is a callable instead of assumed string pattern, it is expected
--- to have signature `(line, init)` and behave like `pattern:find()`.
--- It should return two numbers representing span in `line` next after
--- or at `init` (`nil` if there is no such span).
--- !IMPORTANT NOTE!: it means that output's `from` shouldn't be strictly
--- to the left of `init` (it will lead to infinite loop). Not allowed as
--- last item (as it should be pattern with captures).
--- Example of matching only balanced parenthesis with big enough width: >lua
---
--- {
--- '%b()',
--- function(s, init)
--- if init > 1 or s:len() < 5 then return end
--- return 1, s:len()
--- end,
--- '^.().*().$'
--- }
--- <
--- More examples: >lua
---
--- -- Pair of balanced brackets from set (used for builtin `b` identifier):
--- { { '%b()', '%b[]', '%b{}' }, '^.().*().$' }
---
--- -- Imitate word ignoring digits and punctuation (only for Latin alphabet):
--- { '()()%f[%w]%w+()[ \t]*()' }
---
--- -- Word with camel case support (also supports only Latin alphabet):
--- {
--- {
--- '%u[%l%d]+%f[^%l%d]',
--- '%f[%S][%l%d]+%f[^%l%d]',
--- '%f[%P][%l%d]+%f[^%l%d]',
--- '^[%l%d]+%f[^%l%d]',
--- },
--- '^().*()$'
--- }
---
--- -- Number:
--- { '%f[%d]%d+' }
---
--- -- Date in 'YYYY-MM-DD' format:
--- { '()%d%d%d%d%-%d%d%-%d%d()' }
---
--- -- Lua block string:
--- { '%[%[().-()%]%]' }
--- <
--- See |MiniAi.gen_spec| for function wrappers to create commonly used
--- textobject specifications.
---@tag MiniAi-textobject-specification
--- Algorithm design
---
--- Search for the textobjects relies on these principles:
--- - It uses same input data as described in |MiniAi.find_textobject()|,
--- i.e. whether it is `a` or `i` textobject, its identifier, reference region, etc.
--- - Textobject specification is constructed based on textobject identifier
--- (see |MiniAi-textobject-specification|).
--- - General search is done by converting some 2d buffer region (neighborhood
--- of reference region) into 1d string (each line is appended with `\n`).
--- Then search for a best span matching textobject specification is done
--- inside string (see |MiniAi-glossary|). After that, span is converted back
--- into 2d region. Note: first search is done inside reference region lines,
--- and only after that - inside its neighborhood within `config.n_lines`
--- (see |MiniAi.config|).
--- - The best matching span is chosen by iterating over all spans matching
--- textobject specification and comparing them with "current best".
--- Comparison also depends on reference region (tighter covering is better,
--- otherwise closer is better) and search method (if span is even considered).
--- - Extract span based on extraction pattern (last item in nested pattern).
--- - If task is to perform a consecutive search (`opts.n_times` is greater than 1),
--- steps are repeated with current best match becoming reference region.
--- One such additional step is also done if final region is equal to
--- reference region (this enables consecutive application).
---
--- Notes:
--- - Iteration over all matched spans is done in depth-first fashion with
--- respect to nested pattern.
--- - It is guaranteed that span is compared only once.
--- - For the sake of increasing functionality, during iteration over all
--- matching spans, some Lua patterns in composed pattern are handled
--- specially.
--- - `%bxx` (`xx` is two identical characters). It denotes balanced pair
--- of identical characters and results into "paired" matches. For
--- example, `%b""` for `"aa" "bb"` would match `"aa"` and `"bb"`, but
--- not middle `" "`.
--- - `x.-y` (`x` and `y` are different strings). It results only in matches with
--- smallest width. For example, `e.-o` for `e e o o` will result only in
--- middle `e o`. Note: it has some implications for when parts have
--- quantifiers (like `+`, etc.), which usually can be resolved with
--- frontier pattern `%f[]` (see examples in |MiniAi-textobject-specification|).
---@tag MiniAi-algorithm
-- Module definition ==========================================================
local MiniAi = {}
local H = {}
--- Module setup
---
---@param config table|nil Module config table. See |MiniAi.config|.
---
---@usage >lua
--- require('mini.ai').setup() -- use default config
--- -- OR
--- require('mini.ai').setup({}) -- replace {} with your config table
--- <
MiniAi.setup = function(config)
-- Export module
_G.MiniAi = MiniAi
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
end
--- Module config
---
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
---@text # Options ~
---
--- ## Custom textobjects ~
---
--- Each named entry of `config.custom_textobjects` is a textobject with
--- that identifier and specification (see |MiniAi-textobject-specification|).
--- They are also used to override builtin ones (|MiniAi-textobject-builtin|).
--- Supply non-valid input (not in specification format) to disable module's
--- builtin textobject in favor of external or Neovim's builtin mapping.
---
--- Examples:
--- >lua
--- require('mini.ai').setup({
--- custom_textobjects = {
--- -- Tweak argument textobject
--- a = require('mini.ai').gen_spec.argument({ brackets = { '%b()' } }),
---
--- -- Disable brackets alias in favor of builtin block textobject
--- b = false,
---
--- -- Now `vax` should select `xxx` and `vix` - middle `x`
--- x = { 'x()x()x' },
---
--- -- Whole buffer
--- g = function()
--- local from = { line = 1, col = 1 }
--- local to = {
--- line = vim.fn.line('$'),
--- col = math.max(vim.fn.getline('$'):len(), 1)
--- }
--- return { from = from, to = to }
--- end
--- }
--- })
---
--- -- Use `vim.b.miniai_config` to customize per buffer
--- -- Example of specification useful for Markdown files:
--- local spec_pair = require('mini.ai').gen_spec.pair
--- vim.b.miniai_config = {
--- custom_textobjects = {
--- ['*'] = spec_pair('*', '*', { type = 'greedy' }),
--- ['_'] = spec_pair('_', '_', { type = 'greedy' }),
--- },
--- }
--- <
--- There are more example specifications in |MiniAi-textobject-specification|.
---
--- ## Search method ~
---
--- Value of `config.search_method` defines how best match search is done.
--- Based on its value, one of the following matches will be selected:
--- - Covering match. Left/right edge is before/after left/right edge of
--- reference region.
--- - Previous match. Left/right edge is before left/right edge of reference
--- region.
--- - Next match. Left/right edge is after left/right edge of reference region.
--- - Nearest match. Whichever is closest among previous and next matches.
---
--- Possible values are:
--- - `'cover'` - use only covering match. Don't use either previous or
--- next; report that there is no textobject found.
--- - `'cover_or_next'` (default) - use covering match. If not found, use next.
--- - `'cover_or_prev'` - use covering match. If not found, use previous.
--- - `'cover_or_nearest'` - use covering match. If not found, use nearest.
--- - `'next'` - use next match.
--- - `'prev'` - use previous match.
--- - `'nearest'` - use nearest match.
---
--- Note: search is first performed on the reference region lines and only
--- after failure - on the whole neighborhood defined by `config.n_lines`. This
--- means that with `config.search_method` not equal to `'cover'`, "prev" or
--- "next" textobject will end up as search result if they are found on first
--- stage although covering match might be found in bigger, whole neighborhood.
--- This design is based on observation that most of the time operation is done
--- within reference region lines (usually cursor line).
---
--- Here is an example of what `a)` textobject is based on a value of
--- `'config.search_method'` when cursor is inside `bbb` word:
--- - `'cover'`: `(a) bbb (c)` -> none
--- - `'cover_or_next'`: `(a) bbb (c)` -> `(c)`
--- - `'cover_or_prev'`: `(a) bbb (c)` -> `(a)`
--- - `'cover_or_nearest'`: depends on cursor position.
--- For first and second `b` - as in `cover_or_prev` (as previous match is
--- nearer), for third - as in `cover_or_next` (as next match is nearer).
--- - `'next'`: `(a) bbb (c)` -> `(c)`. Same outcome for `(bbb)`.
--- - `'prev'`: `(a) bbb (c)` -> `(a)`. Same outcome for `(bbb)`.
--- - `'nearest'`: depends on cursor position (same as in `'cover_or_nearest'`).
---
--- ## Mappings ~
---
--- Mappings `around_next`/`inside_next` and `around_last`/`inside_last` are
--- essentially `around`/`inside` but using search method `'next'` and `'prev'`.
MiniAi.config = {
-- Table with textobject id as fields, textobject specification as values.
-- Also use this to disable builtin textobjects. See |MiniAi.config|.
custom_textobjects = nil,
-- Module mappings. Use `''` (empty string) to disable one.
mappings = {
-- Main textobject prefixes
around = 'a',
inside = 'i',
-- Next/last textobjects
around_next = 'an',
inside_next = 'in',
around_last = 'al',
inside_last = 'il',
-- Move cursor to corresponding edge of `a` textobject
goto_left = 'g[',
goto_right = 'g]',
},
-- Number of lines within which textobject is searched
n_lines = 50,
-- How to search for object (first inside current line, then inside
-- neighborhood). One of 'cover', 'cover_or_next', 'cover_or_prev',
-- 'cover_or_nearest', 'next', 'prev', 'nearest'.
search_method = 'cover_or_next',
-- Whether to disable showing non-error feedback
silent = false,
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Find textobject region
---
---@param ai_type string One of `'a'` or `'i'`.
---@param id string Single character string representing textobject id. It is
--- used to get specification which is later used to compute textobject region.
--- Note: if specification is a function, it is called with all present
--- arguments (`opts` is populated with default arguments).
---@param opts table|nil Options. Possible fields:
--- - <n_lines> - Number of lines within which textobject is searched.
--- Default: `config.n_lines` (see |MiniAi.config|).
--- - <n_times> - Number of times to perform a consecutive search. Each one
--- is done with reference region being previous found textobject region.
--- Default: 1.
--- - <reference_region> - region to try to cover (see |MiniAi-glossary|). It
--- is guaranteed that output region will not be inside or equal to this one.
--- Default: empty region at cursor position.
--- - <search_method> - Search method. Default: `config.search_method`.
---
---@return table|nil Region of textobject or `nil` if no textobject different
--- from `opts.reference_region` was consecutively found `opts.n_times` times.
MiniAi.find_textobject = function(ai_type, id, opts)
if not (ai_type == 'a' or ai_type == 'i') then H.error([[`ai_type` should be one of 'a' or 'i'.]]) end
opts = vim.tbl_deep_extend('force', H.get_default_opts(), opts or {})
H.validate_search_method(opts.search_method)
-- Get textobject specification
local tobj_spec = H.get_textobject_spec(id, { ai_type, id, opts })
if tobj_spec == nil then return end
if H.is_region(tobj_spec) then return tobj_spec end
-- Find region
local res = H.find_textobject_region(tobj_spec, ai_type, opts)
if res == nil then
local msg = string.format(
[[No textobject %s found covering region%s within %d line%s and `search_method = '%s'`.]],
vim.inspect(ai_type .. id),
opts.n_times == 1 and '' or (' %s times'):format(opts.n_times),
opts.n_lines,
opts.n_lines == 1 and '' or 's',
opts.search_method
)
H.message(msg)
end
return res
end
--- Move cursor to edge of textobject
---
---@param side string One of `'left'` or `'right'`.
---@param ai_type string One of `'a'` or `'i'`.
---@param id string Single character string representing textobject id.
---@param opts table|nil Same as in |MiniAi.find_textobject()|.
--- `opts.n_times` means number of actual jumps (important when cursor
--- already on the potential jump spot).
MiniAi.move_cursor = function(side, ai_type, id, opts)
if not (side == 'left' or side == 'right') then H.error([[`side` should be one of 'left' or 'right'.]]) end
opts = opts or {}
local init_pos = vim.api.nvim_win_get_cursor(0)
-- Compute single textobject first to find out if it would move the cursor.
-- If not, then eventual `n_times` should be bigger by 1 to imitate `n_times`
-- *actual* jumps. This implements consecutive jumps and has logic of "If
-- cursor is strictly inside region, move to its side first".
local new_opts = vim.tbl_deep_extend('force', opts, { n_times = 1 })
local tobj_single = MiniAi.find_textobject(ai_type, id, new_opts)
if tobj_single == nil then return end
local tobj_side = side == 'left' and 'from' or 'to'
-- Allow empty region
tobj_single.to = tobj_single.to or tobj_single.from
new_opts.n_times = opts.n_times or 1
if (init_pos[1] == tobj_single[tobj_side].line) and (init_pos[2] == tobj_single[tobj_side].col - 1) then
new_opts.n_times = new_opts.n_times + 1
end
-- Compute actually needed textobject while avoiding unnecessary computation
-- in a most common usage (`v:count1 == 1`)
local pos = tobj_single[tobj_side]
if new_opts.n_times > 1 then
local tobj = MiniAi.find_textobject(ai_type, id, new_opts)
if tobj == nil then return end
tobj.to = tobj.to or tobj.from
pos = tobj[tobj_side]
end
-- Move cursor and open enough folds
vim.api.nvim_win_set_cursor(0, { pos.line, pos.col - 1 })
vim.cmd('normal! zv')
end
--- Generate common textobject specifications
---
--- This is a table with function elements. Call to actually get specification.
---
--- Example: >lua
---
--- local gen_spec = require('mini.ai').gen_spec
--- require('mini.ai').setup({
--- custom_textobjects = {
--- -- Tweak argument to be recognized only inside `()` between `;`
--- a = gen_spec.argument({ brackets = { '%b()' }, separator = ';' }),
---
--- -- Tweak function call to not detect dot in function name
--- f = gen_spec.function_call({ name_pattern = '[%w_]' }),
---
--- -- Function definition (needs treesitter queries with these captures)
--- F = gen_spec.treesitter({ a = '@function.outer', i = '@function.inner' }),
---
--- -- Make `|` select both edges in non-balanced way
--- ['|'] = gen_spec.pair('|', '|', { type = 'non-balanced' }),
--- }
--- })
MiniAi.gen_spec = {}
--- Argument specification
---
--- Argument textobject (has default `a` identifier) is a region inside
--- balanced bracket between allowed not excluded separators. Use this function
--- to tweak how it works.
---
--- Examples:
--- - `argument({ brackets = { '%b()' } })` will search for an argument only
--- inside balanced `()`.
--- - `argument({ separator = '[,;]' })` will treat both `,` and `;` as separators.
--- - `argument({ exclude_regions = { '%b()' } })` will exclude separators
--- which are inside balanced `()` (inside outer brackets).
---
---@param opts table|nil Options. Allowed fields:
--- - <brackets> - array of patterns for outer balanced brackets.
--- Default: `{ '%b()', '%b[]', '%b{}' }` (any `()`, `[]`, or `{}` can
--- enclose arguments).
--- - <separator> - separator pattern. Default: `','`.
--- One of the practical usages of this option is to include whitespace
--- around character to be a part of separator. For example, `'%s*,%s*'`
--- will treat as separator not only ',', but its possible surrounding
--- whitespace. This has both positive and negative effects. On one hand,
--- `daa` executed over the first argument will delete whitespace after
--- first comma, leading to a more expected outcome. On the other hand it
--- is ambiguous which argument is picked when cursor is over whitespace
--- near the character separator.
--- - <exclude_regions> - array with patterns for regions inside which
--- separators will be ignored.
--- Default: `{ '%b""', "%b''", '%b()', '%b[]', '%b{}' }` (separators
--- inside balanced quotes or brackets are ignored).
MiniAi.gen_spec.argument = function(opts)
opts = vim.tbl_deep_extend('force', {
brackets = { '%b()', '%b[]', '%b{}' },
separator = ',',
exclude_regions = { '%b""', "%b''", '%b()', '%b[]', '%b{}' },
}, opts or {})
local brackets, separator, exclude_regions = opts.brackets, opts.separator, opts.exclude_regions
local res = {}
-- Match brackets
res[1] = brackets
-- Match argument with both left and right separators/brackets
res[2] = function(s, init)
-- Cache string separators per spec as they are used multiple times.
-- Storing per spec allows coexistence of several argument specifications.
H.cache.argument_sep_spans = H.cache.argument_sep_spans or {}
H.cache.argument_sep_spans[res] = H.cache.argument_sep_spans[res] or {}
local sep_spans = H.cache.argument_sep_spans[res][s] or H.arg_get_separator_spans(s, separator, exclude_regions)
H.cache.argument_sep_spans[res][s] = sep_spans
-- Return span fully on right of `init`, `nil` otherwise
-- For first argument returns left bracket; for last - right one.
for i = 1, #sep_spans - 1 do
if init <= sep_spans[i][1] then return sep_spans[i][1], sep_spans[i + 1][2] end
end
return nil
end
-- Make extraction part
--
-- Extraction of `a` type depends on argument number, `i` - as `a` but
-- without separators and inner whitespace. The reason for this complex
-- solution are the following requirements:
-- - Don't match argument region when cursor is on the outer bracket.
-- Example: `f(xxx)` should select argument only when cursor is on 'x'.
-- - Don't select edge whitespace for first and last argument BUT MATCH WHEN
-- CURSOR IS ON THEM which needs to match edge whitespace right until the
-- extraction part. This is useful when working with padded brackets.
-- Example for `f( xx , yy )`:
-- - `a` object should select 'xx ,' when cursor is on all ' xx ';
-- should select ', yy' when cursor is on all ' yy '.
-- - `i` object should select 'xx' when cursor is on all ' xx ';
-- should select 'yy' when cursor is on all ' yy '.
--
-- At this stage whether argument is first, middle, last, or single is
-- determined by presence of matching separator at either left or right edge.
-- If edge matches separator pattern - it has separator. If not - a bracket.
local left_edge_separator = '^' .. separator
local find_after_left_separator = function(s)
local _, sep_end = s:find(left_edge_separator)
if sep_end == nil then return nil end
return sep_end + 1
end
local find_after_left_bracket = function(s)
local left_sep = find_after_left_separator(s)
if left_sep ~= nil then return nil end
return 2
end
local right_edge_sep = separator .. '$'
local find_before_right_separator = function(s)
local sep_start, _ = s:find(right_edge_sep)
if sep_start == nil then return nil end
return sep_start - 1
end
local find_before_right_bracket = function(s)
local right_sep = find_before_right_separator(s)
if right_sep ~= nil then return nil end
return s:len() - 1
end
local match_and_include = function(left_type, left_include, right_type, right_include)
local find_after_left = left_type == 'bracket' and find_after_left_bracket or find_after_left_separator
local find_before_right = right_type == 'bracket' and find_before_right_bracket or find_before_right_separator
return function(s, init)
-- Match only once
if init > 1 then return nil end
-- Make sure that string matches left and right targets
local left_after, right_before = find_after_left(s), find_before_right(s)
if left_after == nil or right_before == nil then return nil end
-- Possibly include matched edge targets
local left = left_include and 1 or left_after
local right = right_include and s:len() or right_before
return left, right
end
end
local extract_first_arg = '^%s*()().-()%s*' .. separator .. '()$'
local extract_nonfirst_arg = '^()' .. separator .. '%s*().-()()%s*$'
local extract_single_arg = '^%s*().-()%s*$'
res[3] = {
-- First argument. Include right separator, exclude left whitespace.
{ match_and_include('bracket', false, 'separator', true), extract_first_arg },
-- Middle argument. Include only left separator.
{ match_and_include('separator', true, 'separator', false), extract_nonfirst_arg },
-- Last argument. Include left separator, exclude right whitespace.
-- NOTE: it misbehaves for whitespace argument. It's OK because it's rare.
{ match_and_include('separator', true, 'bracket', false), extract_nonfirst_arg },
-- Single argument. Include both whitespace (makes `aa` and `ia` differ).
{ match_and_include('bracket', false, 'bracket', false), extract_single_arg },
}
return res
end
--- Function call specification
---
--- Function call textobject (has default `f` identifier) is a region with some
--- characters followed by balanced `()`. Use this function to tweak how it works.
---
--- Example:
--- - `function_call({ name_pattern = '[%w_]' })` will recognize function name with
--- only alphanumeric or underscore (not dot).
---
---@param opts table|nil Optsion. Allowed fields:
--- - <name_pattern> - string pattern of character set allowed in function name.
--- Default: `'[%w_%.]'` (alphanumeric, underscore, or dot).
--- Note: should be enclosed in `[]`.
MiniAi.gen_spec.function_call = function(opts)
opts = vim.tbl_deep_extend('force', { name_pattern = '[%w_%.]' }, opts or {})
-- Use frontier pattern to select widest possible name
return { '%f' .. opts.name_pattern .. opts.name_pattern .. '+%b()', '^.-%(().*()%)$' }
end
--- Pair specification
---
--- Use it to define textobject for region surrounded with `left` from left and
--- `right` from right. The `a` textobject includes both edges, `i` - excludes them.
---
--- Region can be one of several types (controlled with `opts.type`). All
--- examples are for default search method, `a` textobject, and use `'_'` as
--- both `left` and `right`:
--- - Non-balanced (`{ type = 'non-balanced' }`), default. Equivalent to using
--- `x.-y` as first pattern. Example: on line '_a_b_c_' it consecutively
--- matches '_a_', '_b_', '_c_'.
--- - Balanced (`{ type = 'balanced' }`). Equivalent to using `%bxy` as first
--- pattern. Example: on line '_a_b_c_' it consecutively matches '_a_', '_c_'.
--- Note: both `left` and `right` should be single character.
--- - Greedy (`{ type = 'greedy' }`). Like non-balanced but will select maximum
--- consecutive `left` and `right` edges. Example: on line '__a__b_' it
--- consecutively selects '__a__' and '__b_'. Note: both `left` and `right`
--- should be single character.
---
---@param left string Left edge.
---@param right string Right edge.
---@param opts table|nil Options. Possible fields:
--- - <type> - Type of a pair. One of `'non-balanced'` (default), `'balanced'`,
--- `'greedy'`.
MiniAi.gen_spec.pair = function(left, right, opts)
if not (type(left) == 'string' and type(right) == 'string') then
H.error('Both `left` and `right` should be strings.')
end
opts = vim.tbl_deep_extend('force', { type = 'non-balanced' }, opts or {})
if (opts.type == 'balanced' or opts.type == 'greedy') and not (left:len() == 1 and right:len() == 1) then
local msg =
string.format([[Both `left` and `right` should be single character for `opts.type == '%s'`.]], opts.type)
H.error(msg)
end
local left_esc = vim.pesc(left)
local right_esc = vim.pesc(right)
if opts.type == 'balanced' then return { string.format('%%b%s%s', left, right), '^.().*().$' } end
if opts.type == 'non-balanced' then return { string.format('%s().-()%s', left_esc, right_esc) } end
if opts.type == 'greedy' then
return { string.format('%%f[%s]%s+()[^%s]-()%s+%%f[^%s]', left_esc, left_esc, left_esc, right_esc, right_esc) }
end
H.error([[`opts.type` should be one of 'balanced', 'non-balanced', 'greedy'.]])
end
--- Treesitter specification
---
--- This is a specification in function form. When called with a pair of
--- treesitter captures, it returns a specification function outputting an
--- array of regions that match corresponding (`a` or `i`) capture.
---
--- In order for this to work, apart from working treesitter parser for desired
--- language, user should have a reachable language-specific 'textobjects'
--- query (see |vim.treesitter.query.get()| or |get_query()|, depending on your
--- Neovim version).
--- The most straightforward way for this is to have 'textobjects.scm' query
--- file with treesitter captures stored in some recognized path. This is
--- primarily designed to be compatible with plugin
--- 'nvim-treesitter/nvim-treesitter-textobjects', but can be used without it.
---
--- Two most common approaches for having a query file:
--- - Install 'nvim-treesitter/nvim-treesitter-textobjects'. It has curated and
--- well maintained builtin query files for many languages with a standardized
--- capture names, like `function.outer`, `function.inner`, etc.
--- - Manually create file 'after/queries/<language name>/textobjects.scm' in
--- your |$XDG_CONFIG_HOME| directory. It should contain queries with
--- captures (later used to define textobjects). See |lua-treesitter-query|.
--- To verify that query file is reachable, run (example for "lua" language,
--- output should have at least an intended file): >vim
---
--- :lua print(vim.inspect(vim.treesitter.query.get_files('lua','textobjects')))
--- <
--- Example configuration for function definition textobject with
--- 'nvim-treesitter/nvim-treesitter-textobjects' captures:
--- >lua
--- local spec_treesitter = require('mini.ai').gen_spec.treesitter
--- require('mini.ai').setup({
--- custom_textobjects = {
--- F = spec_treesitter({ a = '@function.outer', i = '@function.inner' }),
--- o = spec_treesitter({
--- a = { '@conditional.outer', '@loop.outer' },
--- i = { '@conditional.inner', '@loop.inner' },
--- })
--- }
--- })
--- <
--- Notes:
--- - By default query is done using 'nvim-treesitter' plugin if it is present
--- (falls back to builtin methods otherwise). This allows for a more
--- advanced features (like multiple buffer languages, custom directives, etc.).
--- See `opts.use_nvim_treesitter` for how to disable this.
--- - It uses buffer's |filetype| to determine query language.
--- - On large files it is slower than pattern-based textobjects. Still very
--- fast though (one search should be magnitude of milliseconds or tens of
--- milliseconds on really large file).
---
---@param ai_captures table Captures for `a` and `i` textobjects: table with
--- <a> and <i> fields with captures for `a` and `i` textobjects respectively.
--- Each value can be either a string capture (should start with `'@'`) or an
--- array of such captures (best among all matches will be chosen).
---@param opts table|nil Options. Possible values:
--- - <use_nvim_treesitter> - whether to try to use 'nvim-treesitter' plugin
--- (if present) to do the query. It implements more advanced behavior at
--- cost of increased execution time. Provides more coherent experience if
--- 'nvim-treesitter-textobjects' queries are used. Default: `true`.
---
---@return function Function with |MiniAi.find_textobject()| signature which
--- returns array of current buffer regions representing matches for
--- corresponding (`a` or `i`) treesitter capture.
---
---@seealso |MiniAi-textobject-specification| for how this type of textobject
--- specification is processed.
--- |get_query()| for how query is fetched in case of no 'nvim-treesitter'.
--- |Query:iter_captures()| for how all query captures are iterated in case of
--- no 'nvim-treesitter'.
MiniAi.gen_spec.treesitter = function(ai_captures, opts)
opts = vim.tbl_deep_extend('force', { use_nvim_treesitter = true }, opts or {})
ai_captures = H.prepare_ai_captures(ai_captures)
return function(ai_type, _, _)
-- Get array of matched treesitter nodes
local target_captures = ai_captures[ai_type]
local has_nvim_treesitter = pcall(require, 'nvim-treesitter') and pcall(require, 'nvim-treesitter.query')
local node_querier = (has_nvim_treesitter and opts.use_nvim_treesitter) and H.get_matched_nodes_plugin
or H.get_matched_nodes_builtin
local matched_nodes = node_querier(target_captures)
-- Return array of regions
return vim.tbl_map(function(node)
local line_from, col_from, line_to, col_to = node:range()
-- `node:range()` returns 0-based numbers for end-exclusive region
return { from = { line = line_from + 1, col = col_from + 1 }, to = { line = line_to + 1, col = col_to } }
end, matched_nodes)
end
end
--- Visually select textobject region
---
--- Does nothing if no region is found.
---
---@param ai_type string One of `'a'` or `'i'`.
---@param id string Single character string representing textobject id.
---@param opts table|nil Same as in |MiniAi.find_textobject()|. Extra fields:
--- - <vis_mode> - One of `'v'`, `'V'`, or `'\22'` (escaped version of `'<C-v>'`).
--- Default: Latest visual mode.
--- - <operator_pending> - Whether selection is for Operator-pending mode.
--- Used in that mode's mappings, shouldn't be used directly. Default: `false`.
MiniAi.select_textobject = function(ai_type, id, opts)
if H.is_disabled() then return end
opts = opts or {}
-- Exit to Normal before getting textobject id. This way invalid id doesn't
-- result into staying in current mode (which seems to be more convenient).
H.exit_to_normal_mode()
local tobj = MiniAi.find_textobject(ai_type, id, opts)