Mercurial > vim

comparison runtime/indent/rust.vim @ 11229:146a1e213b60

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update runtime files. Add Rust support. commit https://github.com/vim/vim/commit/3c2881dc1195f53ebafc387378399ddd6cb677a7 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Mar 21 19:18:29 2017 +0100 Update runtime files. Add Rust support.
author Christian Brabandt <cb@256bit.org>
date Tue, 21 Mar 2017 19:30:06 +0100
parents
children 63b0b7b79b25
comparison
equal deleted inserted replaced
11228:641b98249145 11229:146a1e213b60
1 " Vim indent file
2 " Language: Rust
3 " Author: Chris Morgan <me@chrismorgan.info>
4 " Last Change: 2017 Mar 21
5 " For bugs, patches and license go to https://github.com/rust-lang/rust.vim
6
7 " Only load this indent file when no other was loaded.
8 if exists("b:did_indent")
9 finish
10 endif
11 let b:did_indent = 1
12
13 setlocal cindent
14 setlocal cinoptions=L0,(0,Ws,J1,j1
15 setlocal cinkeys=0{,0},!^F,o,O,0[,0]
16 " Don't think cinwords will actually do anything at all... never mind
17 setlocal cinwords=for,if,else,while,loop,impl,mod,unsafe,trait,struct,enum,fn,extern
18
19 " Some preliminary settings
20 setlocal nolisp " Make sure lisp indenting doesn't supersede us
21 setlocal autoindent " indentexpr isn't much help otherwise
22 " Also do indentkeys, otherwise # gets shoved to column 0 :-/
23 setlocal indentkeys=0{,0},!^F,o,O,0[,0]
24
25 setlocal indentexpr=GetRustIndent(v:lnum)
26
27 " Only define the function once.
28 if exists("*GetRustIndent")
29 finish
30 endif
31
32 let s:save_cpo = &cpo
33 set cpo&vim
34
35 " Come here when loading the script the first time.
36
37 function! s:get_line_trimmed(lnum)
38 " Get the line and remove a trailing comment.
39 " Use syntax highlighting attributes when possible.
40 " NOTE: this is not accurate; /* */ or a line continuation could trick it
41 let line = getline(a:lnum)
42 let line_len = strlen(line)
43 if has('syntax_items')
44 " If the last character in the line is a comment, do a binary search for
45 " the start of the comment. synID() is slow, a linear search would take
46 " too long on a long line.
47 if synIDattr(synID(a:lnum, line_len, 1), "name") =~ 'Comment\|Todo'
48 let min = 1
49 let max = line_len
50 while min < max
51 let col = (min + max) / 2
52 if synIDattr(synID(a:lnum, col, 1), "name") =~ 'Comment\|Todo'
53 let max = col
54 else
55 let min = col + 1
56 endif
57 endwhile
58 let line = strpart(line, 0, min - 1)
59 endif
60 return substitute(line, "\s*$", "", "")
61 else
62 " Sorry, this is not complete, nor fully correct (e.g. string "//").
63 " Such is life.
64 return substitute(line, "\s*//.*$", "", "")
65 endif
66 endfunction
67
68 function! s:is_string_comment(lnum, col)
69 if has('syntax_items')
70 for id in synstack(a:lnum, a:col)
71 let synname = synIDattr(id, "name")
72 if synname == "rustString" || synname =~ "^rustComment"
73 return 1
74 endif
75 endfor
76 else
77 " without syntax, let's not even try
78 return 0
79 endif
80 endfunction
81
82 function GetRustIndent(lnum)
83
84 " Starting assumption: cindent (called at the end) will do it right
85 " normally. We just want to fix up a few cases.
86
87 let line = getline(a:lnum)
88
89 if has('syntax_items')
90 let synname = synIDattr(synID(a:lnum, 1, 1), "name")
91 if synname == "rustString"
92 " If the start of the line is in a string, don't change the indent
93 return -1
94 elseif synname =~ '\(Comment\|Todo\)'
95 \ && line !~ '^\s*/\*' " not /* opening line
96 if synname =~ "CommentML" " multi-line
97 if line !~ '^\s*\*' && getline(a:lnum - 1) =~ '^\s*/\*'
98 " This is (hopefully) the line after a /*, and it has no
99 " leader, so the correct indentation is that of the
100 " previous line.
101 return GetRustIndent(a:lnum - 1)
102 endif
103 endif
104 " If it's in a comment, let cindent take care of it now. This is
105 " for cases like "/*" where the next line should start " * ", not
106 " "* " as the code below would otherwise cause for module scope
107 " Fun fact: " /*\n*\n*/" takes two calls to get right!
108 return cindent(a:lnum)
109 endif
110 endif
111
112 " cindent gets second and subsequent match patterns/struct members wrong,
113 " as it treats the comma as indicating an unfinished statement::
114 "
115 " match a {
116 " b => c,
117 " d => e,
118 " f => g,
119 " };
120
121 " Search backwards for the previous non-empty line.
122 let prevlinenum = prevnonblank(a:lnum - 1)
123 let prevline = s:get_line_trimmed(prevlinenum)
124 while prevlinenum > 1 && prevline !~ '[^[:blank:]]'
125 let prevlinenum = prevnonblank(prevlinenum - 1)
126 let prevline = s:get_line_trimmed(prevlinenum)
127 endwhile
128
129 " Handle where clauses nicely: subsequent values should line up nicely.
130 if prevline[len(prevline) - 1] == ","
131 \ && prevline =~# '^\s*where\s'
132 return indent(prevlinenum) + 6
133 endif
134
135 if prevline[len(prevline) - 1] == ","
136 \ && s:get_line_trimmed(a:lnum) !~ '^\s*[\[\]{}]'
137 \ && prevline !~ '^\s*fn\s'
138 \ && prevline !~ '([^()]\+,$'
139 \ && s:get_line_trimmed(a:lnum) !~ '^\s*\S\+\s*=>'
140 " Oh ho! The previous line ended in a comma! I bet cindent will try to
141 " take this too far... For now, let's normally use the previous line's
142 " indent.
143
144 " One case where this doesn't work out is where *this* line contains
145 " square or curly brackets; then we normally *do* want to be indenting
146 " further.
147 "
148 " Another case where we don't want to is one like a function
149 " definition with arguments spread over multiple lines:
150 "
151 " fn foo(baz: Baz,
152 " baz: Baz) // <-- cindent gets this right by itself
153 "
154 " Another case is similar to the previous, except calling a function
155 " instead of defining it, or any conditional expression that leaves
156 " an open paren:
157 "
158 " foo(baz,
159 " baz);
160 "
161 " if baz && (foo ||
162 " bar) {
163 "
164 " Another case is when the current line is a new match arm.
165 "
166 " There are probably other cases where we don't want to do this as
167 " well. Add them as needed.
168 return indent(prevlinenum)
169 endif
170
171 if !has("patch-7.4.355")
172 " cindent before 7.4.355 doesn't do the module scope well at all; e.g.::
173 "
174 " static FOO : &'static [bool] = [
175 " true,
176 " false,
177 " false,
178 " true,
179 " ];
180 "
181 " uh oh, next statement is indented further!
182
183 " Note that this does *not* apply the line continuation pattern properly;
184 " that's too hard to do correctly for my liking at present, so I'll just
185 " start with these two main cases (square brackets and not returning to
186 " column zero)
187
188 call cursor(a:lnum, 1)
189 if searchpair('{\|(', '', '}\|)', 'nbW',
190 \ 's:is_string_comment(line("."), col("."))') == 0
191 if searchpair('\[', '', '\]', 'nbW',
192 \ 's:is_string_comment(line("."), col("."))') == 0
193 " Global scope, should be zero
194 return 0
195 else
196 " At the module scope, inside square brackets only
197 "if getline(a:lnum)[0] == ']' || search('\[', '', '\]', 'nW') == a:lnum
198 if line =~ "^\\s*]"
199 " It's the closing line, dedent it
200 return 0
201 else
202 return &shiftwidth
203 endif
204 endif
205 endif
206 endif
207
208 " Fall back on cindent, which does it mostly right
209 return cindent(a:lnum)
210 endfunction
211
212 let &cpo = s:save_cpo
213 unlet s:save_cpo