351 lines
11 KiB
VimL
351 lines
11 KiB
VimL
|
" ==============================================================================
|
||
|
|
" File: expand_region.vim
|
||
|
|
" Author: Terry Ma
|
||
|
|
" Last Modified: March 30, 2013
|
||
|
|
" ==============================================================================
|
||
|
|
|
||
|
|
let s:save_cpo = &cpo
|
||
|
|
set cpo&vim
|
||
|
|
|
||
|
|
" ==============================================================================
|
||
|
|
" Settings
|
||
|
|
" ==============================================================================
|
||
|
|
|
||
|
|
" Init global vars
|
||
|
|
function! expand_region#init()
|
||
|
|
if exists('g:expand_region_init') && g:expand_region_init
|
||
|
|
return
|
||
|
|
endif
|
||
|
|
let g:expand_region_init = 1
|
||
|
|
|
||
|
|
" Dictionary of text objects that are supported by default. Note that some of
|
||
|
|
" the text objects are not available in vanilla vim. '1' indicates that the
|
||
|
|
" text object is recursive (think of nested parens or brackets)
|
||
|
|
let g:expand_region_text_objects = get(g:, 'expand_region_text_objects', {
|
||
|
|
\ 'iw' :0,
|
||
|
|
\ 'iW' :0,
|
||
|
|
\ 'i"' :0,
|
||
|
|
\ 'i''' :0,
|
||
|
|
\ 'i]' :1,
|
||
|
|
\ 'ib' :1,
|
||
|
|
\ 'iB' :1,
|
||
|
|
\ 'il' :0,
|
||
|
|
\ 'ip' :0,
|
||
|
|
\ 'ie' :0,
|
||
|
|
\})
|
||
|
|
|
||
|
|
" Option to default to the select mode when selecting a new region
|
||
|
|
let g:expand_region_use_select_mode = get(g:, 'expand_region_use_select_mode', 0)
|
||
|
|
endfunction
|
||
|
|
call expand_region#init()
|
||
|
|
|
||
|
|
" ==============================================================================
|
||
|
|
" Global Functions
|
||
|
|
" ==============================================================================
|
||
|
|
|
||
|
|
" Allow user to customize the global dictionary, or the per file type dictionary
|
||
|
|
function! expand_region#custom_text_objects(...)
|
||
|
|
if a:0 == 1
|
||
|
|
call extend(g:expand_region_text_objects, a:1)
|
||
|
|
elseif a:0 == 2
|
||
|
|
if !exists("g:expand_region_text_objects_".a:1)
|
||
|
|
let g:expand_region_text_objects_{a:1} = {}
|
||
|
|
call extend(g:expand_region_text_objects_{a:1}, g:expand_region_text_objects)
|
||
|
|
endif
|
||
|
|
call extend(g:expand_region_text_objects_{a:1}, a:2)
|
||
|
|
endif
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Returns whether we should perform the region highlighting use visual mode or
|
||
|
|
" select mode
|
||
|
|
function! expand_region#use_select_mode()
|
||
|
|
return g:expand_region_use_select_mode || index(split(s:saved_selectmode, ','), 'cmd') != -1
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Main function
|
||
|
|
function! expand_region#next(mode, direction)
|
||
|
|
call s:expand_region(a:mode, a:direction)
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" ==============================================================================
|
||
|
|
" Variables
|
||
|
|
" ==============================================================================
|
||
|
|
|
||
|
|
" The saved cursor position when user initiates expand. This is the position we
|
||
|
|
" use to calcuate the region for all of our text objects. This is also used to
|
||
|
|
" restore the original cursor position when the region is completely shrinked.
|
||
|
|
let s:saved_pos = []
|
||
|
|
|
||
|
|
" Index into the list of filtered text objects(s:candidates), the text object
|
||
|
|
" this points to is the currently selected region.
|
||
|
|
let s:cur_index = -1
|
||
|
|
|
||
|
|
" The list of filtered text objects used to expand/shrink the visual selection.
|
||
|
|
" This is computed when expand-region is called the first time.
|
||
|
|
" Each item is a dictionary containing the following:
|
||
|
|
" text_object: The actual text object string
|
||
|
|
" start_pos: The result of getpos() on the starting position of the text object
|
||
|
|
" end_pos: The result of getpos() on the ending position of the text object
|
||
|
|
" length: The number of characters for the text object
|
||
|
|
let s:candidates = []
|
||
|
|
|
||
|
|
" This is used to save the user's selectmode setting. If the user's selectmode
|
||
|
|
" contains 'cmd', then our expansion should result in the region selected under
|
||
|
|
" select mode.
|
||
|
|
let s:saved_selectmode = &selectmode
|
||
|
|
|
||
|
|
" ==============================================================================
|
||
|
|
" Functions
|
||
|
|
" ==============================================================================
|
||
|
|
|
||
|
|
" Sort the text object by length in ascending order
|
||
|
|
function! s:sort_text_object(l, r)
|
||
|
|
return a:l.length - a:r.length
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Compare two position arrays. Each input is the result of getpos(). Return a
|
||
|
|
" negative value if lhs occurs before rhs, positive value if after, and 0 if
|
||
|
|
" they are the same.
|
||
|
|
function! s:compare_pos(l, r)
|
||
|
|
" If number lines are the same, compare columns
|
||
|
|
return a:l[1] ==# a:r[1] ? a:l[2] - a:r[2] : a:l[1] - a:r[1]
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Boundary check on the cursor position to make sure it's inside the text object
|
||
|
|
" region. Return 1 if the cursor is within range, 0 otherwise.
|
||
|
|
function! s:is_cursor_inside(pos, region)
|
||
|
|
if s:compare_pos(a:pos, a:region.start_pos) < 0
|
||
|
|
return 0
|
||
|
|
endif
|
||
|
|
if s:compare_pos(a:pos, a:region.end_pos) > 0
|
||
|
|
return 0
|
||
|
|
endif
|
||
|
|
return 1
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Remove duplicates from the candidate list. Two candidates are duplicates if
|
||
|
|
" they cover the exact same region (same length and same starting position)
|
||
|
|
function! s:remove_duplicate(input)
|
||
|
|
let i = len(a:input) - 1
|
||
|
|
while i >= 1
|
||
|
|
if a:input[i].length ==# a:input[i-1].length &&
|
||
|
|
\ a:input[i].start_pos ==# a:input[i-1].start_pos
|
||
|
|
call remove(a:input, i)
|
||
|
|
endif
|
||
|
|
let i-=1
|
||
|
|
endwhile
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Return a single candidate dictionary. Each dictionary contains the following:
|
||
|
|
" text_object: The actual text object string
|
||
|
|
" start_pos: The result of getpos() on the starting position of the text object
|
||
|
|
" end_pos: The result of getpos() on the ending position of the text object
|
||
|
|
" length: The number of characters for the text object
|
||
|
|
function! s:get_candidate_dict(text_object)
|
||
|
|
" Store the current view so we can restore it at the end
|
||
|
|
let winview = winsaveview()
|
||
|
|
|
||
|
|
" Use ! as much as possible
|
||
|
|
exec 'normal! v'
|
||
|
|
exec 'silent! normal '.a:text_object
|
||
|
|
" The double quote is important
|
||
|
|
exec "normal! \<Esc>"
|
||
|
|
|
||
|
|
let selection = s:get_visual_selection()
|
||
|
|
let ret = {
|
||
|
|
\ "text_object": a:text_object,
|
||
|
|
\ "start_pos": selection.start_pos,
|
||
|
|
\ "end_pos": selection.end_pos,
|
||
|
|
\ "length": selection.length,
|
||
|
|
\}
|
||
|
|
|
||
|
|
" Restore peace
|
||
|
|
call winrestview(winview)
|
||
|
|
return ret
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
|
||
|
|
" Return dictionary of text objects that are to be used for the current
|
||
|
|
" filetype. Filetype-specific dictionaries will be loaded if they exist
|
||
|
|
" and the global dictionary will be used as a fallback.
|
||
|
|
function! s:get_configuration()
|
||
|
|
let configuration = {}
|
||
|
|
for ft in split(&ft, '\.')
|
||
|
|
if exists("g:expand_region_text_objects_".ft)
|
||
|
|
call extend(configuration, g:expand_region_text_objects_{ft})
|
||
|
|
endif
|
||
|
|
endfor
|
||
|
|
|
||
|
|
if empty(configuration)
|
||
|
|
call extend(configuration, g:expand_region_text_objects)
|
||
|
|
endif
|
||
|
|
|
||
|
|
return configuration
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Return list of candidate dictionary. Each dictionary contains the following:
|
||
|
|
" text_object: The actual text object string
|
||
|
|
" start_pos: The result of getpos() on the starting position of the text object
|
||
|
|
" length: The number of characters for the text object
|
||
|
|
function! s:get_candidate_list()
|
||
|
|
" Turn off wrap to allow recursive search to work without triggering errors
|
||
|
|
let save_wrapscan = &wrapscan
|
||
|
|
set nowrapscan
|
||
|
|
|
||
|
|
let config = s:get_configuration()
|
||
|
|
|
||
|
|
" Generate the candidate list for every defined text object
|
||
|
|
let candidates = keys(config)
|
||
|
|
call map(candidates, "s:get_candidate_dict(v:val)")
|
||
|
|
|
||
|
|
" For the ones that are recursive, generate them until they no longer match
|
||
|
|
" any region
|
||
|
|
let recursive_candidates = []
|
||
|
|
for i in candidates
|
||
|
|
" Continue if not recursive
|
||
|
|
if !config[i.text_object]
|
||
|
|
continue
|
||
|
|
endif
|
||
|
|
" If the first level is already empty, no point in going any further
|
||
|
|
if i.length ==# 0
|
||
|
|
continue
|
||
|
|
endif
|
||
|
|
let l:count = 2
|
||
|
|
let previous = i.length
|
||
|
|
while 1
|
||
|
|
let test = l:count.i.text_object
|
||
|
|
let candidate = s:get_candidate_dict(test)
|
||
|
|
if candidate.length ==# 0
|
||
|
|
break
|
||
|
|
endif
|
||
|
|
" If we're not producing larger regions, end early
|
||
|
|
if candidate.length ==# previous
|
||
|
|
break
|
||
|
|
endif
|
||
|
|
call add(recursive_candidates, candidate)
|
||
|
|
let l:count+=1
|
||
|
|
let previous = candidate.length
|
||
|
|
endwhile
|
||
|
|
endfor
|
||
|
|
|
||
|
|
" Restore wrapscan
|
||
|
|
let &wrapscan = save_wrapscan
|
||
|
|
|
||
|
|
return extend(candidates, recursive_candidates)
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Return a dictionary containing the start position, end position and length of
|
||
|
|
" the current visual selection.
|
||
|
|
function! s:get_visual_selection()
|
||
|
|
let start_pos = getpos("'<")
|
||
|
|
let end_pos = getpos("'>")
|
||
|
|
let [lnum1, col1] = start_pos[1:2]
|
||
|
|
let [lnum2, col2] = end_pos[1:2]
|
||
|
|
let lines = getline(lnum1, lnum2)
|
||
|
|
let lines[-1] = lines[-1][: col2 - 1]
|
||
|
|
let lines[0] = lines[0][col1 - 1:]
|
||
|
|
return {
|
||
|
|
\ 'start_pos': start_pos,
|
||
|
|
\ 'end_pos': end_pos,
|
||
|
|
\ 'length': len(join(lines, "\n"))
|
||
|
|
\}
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Figure out whether we should compute the candidate text objects, or we're in
|
||
|
|
" the middle of an expand/shrink.
|
||
|
|
function! s:should_compute_candidates(mode)
|
||
|
|
if a:mode ==# 'v'
|
||
|
|
" Check that current visual selection is idential to our last expanded
|
||
|
|
" region
|
||
|
|
if s:cur_index >= 0
|
||
|
|
let selection = s:get_visual_selection()
|
||
|
|
if s:candidates[s:cur_index].start_pos ==# selection.start_pos
|
||
|
|
\ && s:candidates[s:cur_index].length ==# selection.length
|
||
|
|
return 0
|
||
|
|
endif
|
||
|
|
endif
|
||
|
|
endif
|
||
|
|
return 1
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Computes the list of text object candidates to be used given the current
|
||
|
|
" cursor position.
|
||
|
|
function! s:compute_candidates(cursor_pos)
|
||
|
|
" Reset index into the candidates list
|
||
|
|
let s:cur_index = -1
|
||
|
|
|
||
|
|
" Save the current cursor position so we can restore it later
|
||
|
|
let s:saved_pos = a:cursor_pos
|
||
|
|
|
||
|
|
" Compute a list of candidate regions
|
||
|
|
let s:candidates = s:get_candidate_list()
|
||
|
|
|
||
|
|
" Sort them and remove the ones with 0 or 1 length
|
||
|
|
call filter(sort(s:candidates, "s:sort_text_object"), 'v:val.length > 1')
|
||
|
|
|
||
|
|
" Filter out the ones where the cursor falls outside of its region. i" and i'
|
||
|
|
" can start after the cursor position, and ib can start before, so both checks
|
||
|
|
" are needed
|
||
|
|
call filter(s:candidates, 's:is_cursor_inside(s:saved_pos, v:val)')
|
||
|
|
|
||
|
|
" Remove duplicates
|
||
|
|
call s:remove_duplicate(s:candidates)
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Perform the visual selection at the end. If the user wants to be left in
|
||
|
|
" select mode, do so
|
||
|
|
function! s:select_region()
|
||
|
|
exec 'normal! v'
|
||
|
|
exec 'normal '.s:candidates[s:cur_index].text_object
|
||
|
|
if expand_region#use_select_mode()
|
||
|
|
exec "normal! \<C-g>"
|
||
|
|
endif
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
" Expand or shrink the visual selection to the next candidate in the text object
|
||
|
|
" list.
|
||
|
|
function! s:expand_region(mode, direction)
|
||
|
|
" Save the selectmode setting, and remove the setting so our 'v' command do
|
||
|
|
" not get interfered
|
||
|
|
let s:saved_selectmode = &selectmode
|
||
|
|
let &selectmode=""
|
||
|
|
|
||
|
|
if s:should_compute_candidates(a:mode)
|
||
|
|
call s:compute_candidates(getpos('.'))
|
||
|
|
else
|
||
|
|
call setpos('.', s:saved_pos)
|
||
|
|
endif
|
||
|
|
|
||
|
|
if a:direction ==# '+'
|
||
|
|
" Expanding
|
||
|
|
if s:cur_index ==# len(s:candidates) - 1
|
||
|
|
normal! gv
|
||
|
|
else
|
||
|
|
let s:cur_index+=1
|
||
|
|
" Associate the window view with the text object
|
||
|
|
let s:candidates[s:cur_index].prev_winview = winsaveview()
|
||
|
|
call s:select_region()
|
||
|
|
endif
|
||
|
|
else
|
||
|
|
"Shrinking
|
||
|
|
if s:cur_index <=# 0
|
||
|
|
" In visual mode, doing nothing here will return us to normal mode. For
|
||
|
|
" select mode, the following is needed.
|
||
|
|
if expand_region#use_select_mode()
|
||
|
|
exec "normal! gV"
|
||
|
|
endif
|
||
|
|
else
|
||
|
|
" Restore the window view
|
||
|
|
call winrestview(s:candidates[s:cur_index].prev_winview)
|
||
|
|
let s:cur_index-=1
|
||
|
|
call s:select_region()
|
||
|
|
endif
|
||
|
|
endif
|
||
|
|
|
||
|
|
" Restore the selectmode setting
|
||
|
|
let &selectmode = s:saved_selectmode
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
let &cpo = s:save_cpo
|
||
|
|
unlet s:save_cpo
|