summaryrefslogtreecommitdiffstats
path: root/runtime/indent/r.vim
blob: f7956e4fe0b891c8ff66ba9a64d90c5f5645f3ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
" Vim indent file
" Language:	R
" Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
" Homepage:     https://github.com/jalvesaq/R-Vim-runtime
" Last Change:	Sun Oct 08, 2023  10:45AM


" Only load this indent file when no other was loaded.
if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentkeys=0{,0},:,!^F,o,O,e
setlocal indentexpr=GetRIndent()
setlocal autoindent

let b:undo_indent = "setl inde< indk<"

" Only define the function once.
if exists("*GetRIndent")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

" Options to make the indentation more similar to Emacs/ESS:
let g:r_indent_align_args     = get(g:, 'r_indent_align_args',      1)
let g:r_indent_ess_comments   = get(g:, 'r_indent_ess_comments',    0)
let g:r_indent_comment_column = get(g:, 'r_indent_comment_column', 40)
let g:r_indent_ess_compatible = get(g:, 'r_indent_ess_compatible',  0)
let g:r_indent_op_pattern     = get(g:, 'r_indent_op_pattern',
      \ '\(&\||\|+\|-\|\*\|/\|=\|\~\|%\|->\||>\)\s*$')

function s:RDelete_quotes(line)
  let i = 0
  let j = 0
  let line1 = ""
  let llen = strlen(a:line)
  while i < llen
    if a:line[i] == '"'
      let i += 1
      let line1 = line1 . 's'
      while !(a:line[i] == '"' && ((i > 1 && a:line[i-1] == '\' && a:line[i-2] == '\') || a:line[i-1] != '\')) && i < llen
        let i += 1
      endwhile
      if a:line[i] == '"'
        let i += 1
      endif
    elseif a:line[i] == "'"
      let i += 1
      let line1 = line1 . 's'
      while !(a:line[i] == "'" && ((i > 1 && a:line[i-1] == '\' && a:line[i-2] == '\') || a:line[i-1] != '\')) && i < llen
        let i += 1
      endwhile
      if a:line[i] == "'"
        let i += 1
      endif
    elseif a:line[i] == "`"
      let i += 1
      let line1 = line1 . 's'
      while a:line[i] != "`" && i < llen
        let i += 1
      endwhile
      if a:line[i] == "`"
        let i += 1
      endif
    endif
    if i == llen
      break
    endif
    let line1 = line1 . a:line[i]
    let j += 1
    let i += 1
  endwhile
  return line1
endfunction

" Convert foo(bar()) int foo()
function s:RDelete_parens(line)
  if s:Get_paren_balance(a:line, "(", ")") != 0
    return a:line
  endif
  let i = 0
  let j = 0
  let line1 = ""
  let llen = strlen(a:line)
  while i < llen
    let line1 = line1 . a:line[i]
    if a:line[i] == '('
      let nop = 1
      while nop > 0 && i < llen
        let i += 1
        if a:line[i] == ')'
          let nop -= 1
        elseif a:line[i] == '('
          let nop += 1
        endif
      endwhile
      let line1 = line1 . a:line[i]
    endif
    let i += 1
  endwhile
  return line1
endfunction

function s:Get_paren_balance(line, o, c)
  let line2 = substitute(a:line, a:o, "", "g")
  let openp = strlen(a:line) - strlen(line2)
  let line3 = substitute(line2, a:c, "", "g")
  let closep = strlen(line2) - strlen(line3)
  return openp - closep
endfunction

function s:Get_matching_brace(linenr, o, c, delbrace)
  let line = SanitizeRLine(getline(a:linenr))
  if a:delbrace == 1
    let line = substitute(line, '{$', "", "")
  endif
  let pb = s:Get_paren_balance(line, a:o, a:c)
  let i = a:linenr
  while pb != 0 && i > 1
    let i -= 1
    let pb += s:Get_paren_balance(SanitizeRLine(getline(i)), a:o, a:c)
  endwhile
  return i
endfunction

" This function is buggy because there 'if's without 'else'
" It must be rewritten relying more on indentation
function s:Get_matching_if(linenr, delif)
  let line = SanitizeRLine(getline(a:linenr))
  if a:delif
    let line = substitute(line, "if", "", "g")
  endif
  let elsenr = 0
  let i = a:linenr
  let ifhere = 0
  while i > 0
    let line2 = substitute(line, '\<else\>', "xxx", "g")
    let elsenr += strlen(line) - strlen(line2)
    if line =~ '.*\s*if\s*()' || line =~ '.*\s*if\s*()'
      let elsenr -= 1
      if elsenr == 0
        let ifhere = i
        break
      endif
    endif
    let i -= 1
    let line = SanitizeRLine(getline(i))
  endwhile
  if ifhere
    return ifhere
  else
    return a:linenr
  endif
endfunction

function s:Get_last_paren_idx(line, o, c, pb)
  let blc = a:pb
  let line = substitute(a:line, '\t', s:curtabstop, "g")
  let theidx = -1
  let llen = strlen(line)
  let idx = 0
  while idx < llen
    if line[idx] == a:o
      let blc -= 1
      if blc == 0
        let theidx = idx
      endif
    elseif line[idx] == a:c
      let blc += 1
    endif
    let idx += 1
  endwhile
  return theidx + 1
endfunction

" Get previous relevant line. Search back until getting a line that isn't
" comment or blank
function s:Get_prev_line(lineno)
  let lnum = a:lineno - 1
  let data = getline( lnum )
  while lnum > 0 && (data =~ '^\s*#' || data =~ '^\s*$')
    let lnum = lnum - 1
    let data = getline( lnum )
  endwhile
  return lnum
endfunction

" This function is also used by r-plugin/common_global.vim
" Delete from '#' to the end of the line, unless the '#' is inside a string.
function SanitizeRLine(line)
  let newline = s:RDelete_quotes(a:line)
  let newline = s:RDelete_parens(newline)
  let newline = substitute(newline, '#.*', "", "")
  let newline = substitute(newline, '\s*$', "", "")
  if &filetype == "rhelp" && newline =~ '^\\method{.*}{.*}(.*'
    let newline = substitute(newline, '^\\method{\(.*\)}{.*}', '\1', "")
  endif
  return newline
endfunction

function GetRIndent()

  let clnum = line(".")    " current line

  let cline = getline(clnum)
  if cline =~ '^\s*#'
    if g:r_indent_ess_comments == 1
      if cline =~ '^\s*###'
        return 0
      endif
      if cline !~ '^\s*##'
        return g:r_indent_comment_column
      endif
    endif
  endif

  let cline = SanitizeRLine(cline)

  if cline =~ '^\s*}'
    let indline = s:Get_matching_brace(clnum, '{', '}', 1)
    if indline > 0 && indline != clnum
      let iline = SanitizeRLine(getline(indline))
      if s:Get_paren_balance(iline, "(", ")") == 0 || iline =~ '(\s*{$'
        return indent(indline)
      else
        let indline = s:Get_matching_brace(indline, '(', ')', 1)
        return indent(indline)
      endif
    endif
  endif

  if cline =~ '^\s*)$'
    let indline = s:Get_matching_brace(clnum, '(', ')', 1)
    return indent(indline)
  endif

  " Find the first non blank line above the current line
  let lnum = s:Get_prev_line(clnum)
  " Hit the start of the file, use zero indent.
  if lnum == 0
    return 0
  endif

  let line = SanitizeRLine(getline(lnum))

  if &filetype == "rhelp"
    if cline =~ '^\\dontshow{' || cline =~ '^\\dontrun{' || cline =~ '^\\donttest{' || cline =~ '^\\testonly{'
      return 0
    endif
    if line =~ '^\\examples{' || line =~ '^\\usage{' || line =~ '^\\dontshow{' || line =~ '^\\dontrun{' || line =~ '^\\donttest{' || line =~ '^\\testonly{'
      return 0
    endif
  endif

  if &filetype == "rnoweb" && line =~ "^<<.*>>="
    return 0
  endif

  if cline =~ '^\s*{' && s:Get_paren_balance(cline, '{', '}') > 0
    if g:r_indent_ess_compatible && line =~ ')$'
      let nlnum = lnum
      let nline = line
      while s:Get_paren_balance(nline, '(', ')') < 0
        let nlnum = s:Get_prev_line(nlnum)
        let nline = SanitizeRLine(getline(nlnum)) . nline
      endwhile
      if nline =~ '^\s*function\s*(' && indent(nlnum) == shiftwidth()
        return 0
      endif
    endif
    if s:Get_paren_balance(line, "(", ")") == 0
      return indent(lnum)
    endif
  endif

  " line is an incomplete command:
  if line =~ '\<\(if\|while\|for\|function\)\s*()$' || line =~ '\<else$' || line =~ '<-$' || line =~ '->$'
    return indent(lnum) + shiftwidth()
  endif

  " Deal with () and []

  let pb = s:Get_paren_balance(line, '(', ')')

  if line =~ '^\s*{$' || line =~ '(\s*{' || (pb == 0 && (line =~ '{$' || line =~ '(\s*{$'))
    return indent(lnum) + shiftwidth()
  endif

  let s:curtabstop = repeat(' ', &tabstop)

  if g:r_indent_align_args == 1
    if pb > 0 && line =~ '{$'
      return s:Get_last_paren_idx(line, '(', ')', pb) + shiftwidth()
    endif

    let bb = s:Get_paren_balance(line, '[', ']')

    if pb > 0
      if &filetype == "rhelp"
        let ind = s:Get_last_paren_idx(line, '(', ')', pb)
      else
        let ind = s:Get_last_paren_idx(getline(lnum), '(', ')', pb)
      endif
      return ind
    endif

    if pb < 0 && line =~ '.*[,&|\-\*+<>]$'
      if line =~ '.*[\-\*+>]$'
        let is_op = v:true
      else
        let is_op = v:false
      endif
      let lnum = s:Get_prev_line(lnum)
      while pb < 1 && lnum > 0
        let line = SanitizeRLine(getline(lnum))
        let line = substitute(line, '\t', s:curtabstop, "g")
        let ind = strlen(line)
        while ind > 0
          if line[ind] == ')'
            let pb -= 1
          elseif line[ind] == '('
            let pb += 1
            if is_op && pb == 0
              return indent(lnum)
            endif
          endif
          if pb == 1
            return ind + 1
          endif
          let ind -= 1
        endwhile
        let lnum -= 1
      endwhile
      return 0
    endif

    if bb > 0
      let ind = s:Get_last_paren_idx(getline(lnum), '[', ']', bb)
      return ind
    endif
  endif

  let post_block = 0
  if line =~ '}$' && s:Get_paren_balance(line, '{', '}') < 0
    let lnum = s:Get_matching_brace(lnum, '{', '}', 0)
    let line = SanitizeRLine(getline(lnum))
    if lnum > 0 && line =~ '^\s*{'
      let lnum = s:Get_prev_line(lnum)
      let line = SanitizeRLine(getline(lnum))
    endif
    let pb = s:Get_paren_balance(line, '(', ')')
    let post_block = 1
  endif

  " Indent after operator pattern
  let olnum = s:Get_prev_line(lnum)
  let oline = getline(olnum)
  if olnum > 0
    if substitute(line, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
      if substitute(oline, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
        return indent(lnum)
      else
        return indent(lnum) + shiftwidth()
      endif
    elseif substitute(oline, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
      return indent(lnum) - shiftwidth()
    endif
  elseif substitute(line, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
    return indent(lnum) + shiftwidth()
  endif

  let post_fun = 0
  if pb < 0 && line !~ ')\s*[,&|\-\*+<>]$'
    let post_fun = 1
    while pb < 0 && lnum > 0
      let lnum -= 1
      let linepiece = SanitizeRLine(getline(lnum))
      let pb += s:Get_paren_balance(linepiece, "(", ")")
      let line = linepiece . line
    endwhile
    if line =~ '{$' && post_block == 0
      return indent(lnum) + shiftwidth()
    endif

    " Now we can do some tests again
    if cline =~ '^\s*{'
      return indent(lnum)
    endif
    if post_block == 0
      let newl = SanitizeRLine(line)
      if newl =~ '\<\(if\|while\|for\|function\)\s*()$' || newl =~ '\<else$' || newl =~ '<-$'
        return indent(lnum) + shiftwidth()
      endif
    endif
  endif

  if cline =~ '^\s*else'
    if line =~ '<-\s*if\s*()'
      return indent(lnum) + shiftwidth()
    elseif line =~ '\<if\s*()'
      return indent(lnum)
    else
      return indent(lnum) - shiftwidth()
    endif
  endif

  let bb = s:Get_paren_balance(line, '[', ']')
  if bb < 0 && line =~ '.*]'
    while bb < 0 && lnum > 0
      let lnum -= 1
      let linepiece = SanitizeRLine(getline(lnum))
      let bb += s:Get_paren_balance(linepiece, "[", "]")
      let line = linepiece . line
    endwhile
    let line = s:RDelete_parens(line)
  endif

  let plnum = s:Get_prev_line(lnum)
  let ppost_else = 0
  if plnum > 0
    let pline = SanitizeRLine(getline(plnum))
    let ppost_block = 0
    if pline =~ '}$'
      let ppost_block = 1
      let plnum = s:Get_matching_brace(plnum, '{', '}', 0)
      let pline = SanitizeRLine(getline(plnum))
      if pline =~ '^\s*{$' && plnum > 0
        let plnum = s:Get_prev_line(plnum)
        let pline = SanitizeRLine(getline(plnum))
      endif
    endif

    if pline =~ 'else$'
      let ppost_else = 1
      let plnum = s:Get_matching_if(plnum, 0)
      let pline = SanitizeRLine(getline(plnum))
    endif

    if pline =~ '^\s*else\s*if\s*('
      let pplnum = s:Get_prev_line(plnum)
      let ppline = SanitizeRLine(getline(pplnum))
      while ppline =~ '^\s*else\s*if\s*(' || ppline =~ '^\s*if\s*()\s*\S$'
        let plnum = pplnum
        let pline = ppline
        let pplnum = s:Get_prev_line(plnum)
        let ppline = SanitizeRLine(getline(pplnum))
      endwhile
      while ppline =~ '\<\(if\|while\|for\|function\)\s*()$' || ppline =~ '\<else$' || ppline =~ '<-$'
        let plnum = pplnum
        let pline = ppline
        let pplnum = s:Get_prev_line(plnum)
        let ppline = SanitizeRLine(getline(pplnum))
      endwhile
    endif

    let ppb = s:Get_paren_balance(pline, '(', ')')
    if ppb < 0 && (pline =~ ')\s*{$' || pline =~ ')$')
      while ppb < 0 && plnum > 0
        let plnum -= 1
        let linepiece = SanitizeRLine(getline(plnum))
        let ppb += s:Get_paren_balance(linepiece, "(", ")")
        let pline = linepiece . pline
      endwhile
      let pline = s:RDelete_parens(pline)
    endif
  endif

  let ind = indent(lnum)

  if g:r_indent_align_args == 0 && pb != 0
    let ind += pb * shiftwidth()
    return ind
  endif

  if g:r_indent_align_args == 0 && bb != 0
    let ind += bb * shiftwidth()
    return ind
  endif

  if plnum > 0
    let pind = indent(plnum)
  else
    let pind = 0
  endif

  if ind == pind || (ind == (pind  + shiftwidth()) && pline =~ '{$' && ppost_else == 0)
    return ind
  endif

  let pline = getline(plnum)
  let pbb = s:Get_paren_balance(pline, '[', ']')

  while pind < ind && plnum > 0 && ppb == 0 && pbb == 0
    let ind = pind
    let plnum = s:Get_prev_line(plnum)
    let pline = getline(plnum)
    let ppb = s:Get_paren_balance(pline, '(', ')')
    let pbb = s:Get_paren_balance(pline, '[', ']')
    while pline =~ '^\s*else'
      let plnum = s:Get_matching_if(plnum, 1)
      let pline = getline(plnum)
      let ppb = s:Get_paren_balance(pline, '(', ')')
      let pbb = s:Get_paren_balance(pline, '[', ']')
    endwhile
    let pind = indent(plnum)
    if ind == (pind  + shiftwidth()) && pline =~ '{$'
      return ind
    endif
  endwhile

  return ind
endfunction

let &cpo = s:cpo_save
unlet s:cpo_save

" vim: sw=2