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1" Vim indent file
2" Language: Javascript
3" Maintainer: Darrick Wiebe <darrick at innatesoftware.com>
4" URL: http://github.com/pangloss/vim-javascript
5" Version: 1.0.0
6" Last Change: August 31, 2009
7" Acknowledgement: Based off of vim-ruby maintained by Nikolai Weibull http://vim-ruby.rubyforge.org
8
9" 0. Initialization {{{1
10" =================
11
12" Only load this indent file when no other was loaded.
13if exists("b:did_indent")
14 finish
15endif
16let b:did_indent = 1
17
18setlocal nosmartindent
19
20" Now, set up our indentation expression and keys that trigger it.
21setlocal indentexpr=GetJavascriptIndent()
22setlocal indentkeys=0{,0},0),0],!^F,o,O,e
23
24" Only define the function once.
25if exists("*GetJavascriptIndent")
26 finish
27endif
28
29let s:cpo_save = &cpo
30set cpo&vim
31
32" 1. Variables {{{1
33" ============
34
35" Regex of syntax group names that are or delimit string or are comments.
36let s:syng_strcom = 'javaScript\%(String\|RegexpString\|CommentTodo\|LineComment\|Comment\|DocComment\)'
37
38" Regex of syntax group names that are strings.
39let s:syng_string = 'javaScript\%(RegexpString\)'
40
41" Regex of syntax group names that are strings or documentation.
42let s:syng_stringdoc = 'javaScriptDocComment\|javaScriptComment'
43
44" Expression used to check whether we should skip a match with searchpair().
45let s:skip_expr = "synIDattr(synID(line('.'),col('.'),1),'name') =~ '".s:syng_strcom."'"
46
47let s:line_term = '\s*\%(\%(\/\/\).*\)\=$'
48
49" Regex that defines continuation lines, not including (, {, or [.
50let s:continuation_regex = '\%([\\*+/.:]\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)' . s:line_term
51
52" Regex that defines continuation lines.
53" TODO: this needs to deal with if ...: and so on
54let s:msl_regex = '\%([\\*+/.:([]\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)' . s:line_term
55
56let s:one_line_scope_regex = '\<\%(if\|else\|for\|while\)\>[^{;]*' . s:line_term
57
58" Regex that defines blocks.
59let s:block_regex = '\%({\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=' . s:line_term
60
61" 2. Auxiliary Functions {{{1
62" ======================
63
64" Check if the character at lnum:col is inside a string, comment, or is ascii.
65function s:IsInStringOrComment(lnum, col)
66 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
67endfunction
68
69" Check if the character at lnum:col is inside a string.
70function s:IsInString(lnum, col)
71 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
72endfunction
73
74" Check if the character at lnum:col is inside a string or documentation.
75function s:IsInStringOrDocumentation(lnum, col)
76 return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
77endfunction
78
79" Find line above 'lnum' that isn't empty, in a comment, or in a string.
80function s:PrevNonBlankNonString(lnum)
81 let in_block = 0
82 let lnum = prevnonblank(a:lnum)
83 while lnum > 0
84 " Go in and out of blocks comments as necessary.
85 " If the line isn't empty (with opt. comment) or in a string, end search.
86 let line = getline(lnum)
87 if line =~ '/\*'
88 if in_block
89 let in_block = 0
90 else
91 break
92 endif
93 elseif !in_block && line =~ '\*/'
94 let in_block = 1
95 elseif !in_block && line !~ '^\s*\%(//\).*$' && !(s:IsInStringOrComment(lnum, 1) && s:IsInStringOrComment(lnum, strlen(line)))
96 break
97 endif
98 let lnum = prevnonblank(lnum - 1)
99 endwhile
100 return lnum
101endfunction
102
103" Find line above 'lnum' that started the continuation 'lnum' may be part of.
104function s:GetMSL(lnum, in_one_line_scope)
105 " Start on the line we're at and use its indent.
106 let msl = a:lnum
107 let lnum = s:PrevNonBlankNonString(a:lnum - 1)
108 while lnum > 0
109 " If we have a continuation line, or we're in a string, use line as MSL.
110 " Otherwise, terminate search as we have found our MSL already.
111 let line = getline(lnum)
112 let col = match(line, s:msl_regex) + 1
113 if (col > 0 && !s:IsInStringOrComment(lnum, col)) || s:IsInString(lnum, strlen(line))
114 let msl = lnum
115 else
116 " Don't use lines that are part of a one line scope as msl unless the
117 " flag in_one_line_scope is set to 1
118 "
119 if a:in_one_line_scope
120 break
121 end
122 let msl_one_line = s:Match(lnum, s:one_line_scope_regex)
123 if msl_one_line == 0
124 break
125 endif
126 endif
127 let lnum = s:PrevNonBlankNonString(lnum - 1)
128 endwhile
129 return msl
130endfunction
131
132" Check if line 'lnum' has more opening brackets than closing ones.
133function s:LineHasOpeningBrackets(lnum)
134 let open_0 = 0
135 let open_2 = 0
136 let open_4 = 0
137 let line = getline(a:lnum)
138 let pos = match(line, '[][(){}]', 0)
139 while pos != -1
140 if !s:IsInStringOrComment(a:lnum, pos + 1)
141 let idx = stridx('(){}[]', line[pos])
142 if idx % 2 == 0
143 let open_{idx} = open_{idx} + 1
144 else
145 let open_{idx - 1} = open_{idx - 1} - 1
146 endif
147 endif
148 let pos = match(line, '[][(){}]', pos + 1)
149 endwhile
150 return (open_0 > 0) . (open_2 > 0) . (open_4 > 0)
151endfunction
152
153function s:Match(lnum, regex)
154 let col = match(getline(a:lnum), a:regex) + 1
155 return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
156endfunction
157
158function s:IndentWithContinuation(lnum, ind, width)
159 " Set up variables to use and search for MSL to the previous line.
160 let p_lnum = a:lnum
161 let lnum = s:GetMSL(a:lnum, 1)
162 let line = getline(line)
163
164 " If the previous line wasn't a MSL and is continuation return its indent.
165 " TODO: the || s:IsInString() thing worries me a bit.
166 if p_lnum != lnum
167 if s:Match(p_lnum,s:continuation_regex)||s:IsInString(p_lnum,strlen(line))
168 return a:ind
169 endif
170 endif
171
172 " Set up more variables now that we know we aren't continuation bound.
173 let msl_ind = indent(lnum)
174
175 " If the previous line ended with [*+/.-=], start a continuation that
176 " indents an extra level.
177 if s:Match(lnum, s:continuation_regex)
178 if lnum == p_lnum
179 return msl_ind + a:width
180 else
181 return msl_ind
182 endif
183 endif
184
185 return a:ind
186endfunction
187
188function s:InOneLineScope(lnum)
189 let msl = s:GetMSL(a:lnum, 1)
190 if msl > 0 && s:Match(msl, s:one_line_scope_regex)
191 return msl
192 endif
193 return 0
194endfunction
195
196function s:ExitingOneLineScope(lnum)
197 let msl = s:GetMSL(a:lnum, 1)
198 if msl > 0
199 " if the current line is in a one line scope ..
200 if s:Match(msl, s:one_line_scope_regex)
201 return 0
202 else
203 let prev_msl = s:GetMSL(msl - 1, 1)
204 if s:Match(prev_msl, s:one_line_scope_regex)
205 return prev_msl
206 endif
207 endif
208 endif
209 return 0
210endfunction
211
212" 3. GetJavascriptIndent Function {{{1
213" =========================
214
215function GetJavascriptIndent()
216 " 3.1. Setup {{{2
217 " ----------
218
219 " Set up variables for restoring position in file. Could use v:lnum here.
220 let vcol = col('.')
221
222 " 3.2. Work on the current line {{{2
223 " -----------------------------
224
225 " Get the current line.
226 let line = getline(v:lnum)
227 let ind = -1
228
229
230 " If we got a closing bracket on an empty line, find its match and indent
231 " according to it. For parentheses we indent to its column - 1, for the
232 " others we indent to the containing line's MSL's level. Return -1 if fail.
233 let col = matchend(line, '^\s*[]})]')
234 if col > 0 && !s:IsInStringOrComment(v:lnum, col)
235 call cursor(v:lnum, col)
236 let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
237 if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
238 if line[col-1]==')' && col('.') != col('$') - 1
239 let ind = virtcol('.')-1
240 else
241 let ind = indent(s:GetMSL(line('.'), 0))
242 endif
243 endif
244 return ind
245 endif
246
247 " If we have a /* or */ set indent to first column.
248 if match(line, '^\s*\%(/\*\|\*/\)$') != -1
249 return 0
250 endif
251
252 " If we are in a multi-line string or line-comment, don't do anything to it.
253 if s:IsInStringOrDocumentation(v:lnum, matchend(line, '^\s*') + 1)
254 return indent('.')
255 endif
256
257 " 3.3. Work on the previous line. {{{2
258 " -------------------------------
259
260 " Find a non-blank, non-multi-line string line above the current line.
261 let lnum = s:PrevNonBlankNonString(v:lnum - 1)
262
263 " If the line is empty and inside a string, use the previous line.
264 if line =~ '^\s*$' && lnum != prevnonblank(v:lnum - 1)
265 return indent(prevnonblank(v:lnum))
266 endif
267
268 " At the start of the file use zero indent.
269 if lnum == 0
270 return 0
271 endif
272
273 " Set up variables for current line.
274 let line = getline(lnum)
275 let ind = indent(lnum)
276
277 " If the previous line ended with a block opening, add a level of indent.
278 if s:Match(lnum, s:block_regex)
279 return indent(s:GetMSL(lnum, 0)) + &sw
280 endif
281
282 " If the previous line contained an opening bracket, and we are still in it,
283 " add indent depending on the bracket type.
284 if line =~ '[[({]'
285 let counts = s:LineHasOpeningBrackets(lnum)
286 if counts[0] == '1' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
287 if col('.') + 1 == col('$')
288 return ind + &sw
289 else
290 return virtcol('.')
291 endif
292 elseif counts[1] == '1' || counts[2] == '1'
293 return ind + &sw
294 else
295 call cursor(v:lnum, vcol)
296 end
297 endif
298
299 " 3.4. Work on the MSL line. {{{2
300 " --------------------------
301
302 let ind_con = ind
303 let ind = s:IndentWithContinuation(lnum, ind_con, &sw)
304
305 " }}}2
306 "
307 "
308 let ols = s:InOneLineScope(lnum)
309 if ols > 0
310 let ind = ind + &sw
311 else
312 let ols = s:ExitingOneLineScope(lnum)
313 while ols > 0 && ind > 0
314 let ind = ind - &sw
315 let ols = s:InOneLineScope(ols - 1)
316 endwhile
317 endif
318
319 return ind
320endfunction
321
322" }}}1
323
324let &cpo = s:cpo_save
325unlet s:cpo_save
326
327" vim:set sw=2 sts=2 ts=8 noet:
328