summaryrefslogtreecommitdiffstats
path: root/runtime/indent/dtd.vim
blob: 963ac408efb7294aef8141725bfc0e8673fd17c5 (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
" Vim indent file
" Language:    	    DTD (Document Type Definition for XML)
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2011-07-08

setlocal indentexpr=GetDTDIndent()
setlocal indentkeys=!^F,o,O,>
setlocal nosmartindent

if exists("*GetDTDIndent")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

" TODO: Needs to be adjusted to stop at [, <, and ].
let s:token_pattern = '^[^[:space:]]\+'

function s:lex1(input, start, ...)
  let pattern = a:0 > 0 ? a:1 : s:token_pattern
  let start = matchend(a:input, '^\_s*', a:start)
  if start == -1
    return ["", a:start]
  endif
  let end = matchend(a:input, pattern, start)
  if end == -1
    return ["", a:start]
  endif
  let token = strpart(a:input, start, end - start)
  return [token, end]
endfunction

function s:lex(input, start, ...)
  let pattern = a:0 > 0 ? a:1 : s:token_pattern
  let info = s:lex1(a:input, a:start, pattern)
  while info[0] == '--'
    let info = s:lex1(a:input, info[1], pattern)
    while info[0] != "" && info[0] != '--'
      let info = s:lex1(a:input, info[1], pattern)
    endwhile
    if info[0] == ""
      return info
    endif
    let info = s:lex1(a:input, info[1], pattern)
  endwhile
  return info
endfunction

function s:indent_to_innermost_parentheses(line, end)
  let token = '('
  let end = a:end
  let parentheses = [end - 1]
  while token != ""
    let [token, end] = s:lex(a:line, end, '^\%([(),|]\|[A-Za-z0-9_-]\+\|#P\=CDATA\|%[A-Za-z0-9_-]\+;\)[?*+]\=')
    if token[0] == '('
      call add(parentheses, end - 1)
    elseif token[0] == ')'
      if len(parentheses) == 1
        return [-1, end]
      endif
      call remove(parentheses, -1)
    endif
  endwhile
  return [parentheses[-1] - strridx(a:line, "\n", parentheses[-1]), end]
endfunction

" TODO: Line and end could be script global (think OO members).
function GetDTDIndent()
  if v:lnum == 1
    return 0
  endif
  
  " Begin by searching back for a <! that isn’t inside a comment.
  " From here, depending on what follows immediately after, parse to
  " where we’re at to determine what to do.
  if search('<!', 'bceW') == 0
    return indent(v:lnum - 1)
  endif
  let lnum = line('.')
  let col = col('.')
  let indent = indent('.')
  let line = lnum == v:lnum ? getline(lnum) : join(getline(lnum, v:lnum - 1), "\n")

  let [declaration, end] = s:lex1(line, col)
  if declaration == ""
    return indent + shiftwidth()
  elseif declaration == '--'
    " We’re looking at a comment.  Now, simply determine if the comment is
    " terminated or not.  If it isn’t, let Vim take care of that using
    " 'comments' and 'autoindent'. Otherwise, indent to the first lines level.
    while declaration != ""
      let [declaration, end] = s:lex(line, end)
      if declaration == "-->"
        return indent
      endif
    endwhile
    return -1
  elseif declaration == 'ELEMENT'
    " Check for element name.  If none exists, indent one level.
    let [name, end] = s:lex(line, end)
    if name == ""
      return indent + shiftwidth()
    endif

    " Check for token following element name.  This can be a specification of
    " whether the start or end tag may be omitted.  If nothing is found, indent
    " one level.
    let [token, end] = s:lex(line, end, '^\%([-O(]\|ANY\|EMPTY\)')
    let n = 0
    while token =~ '[-O]' && n < 2
      let [token, end] = s:lex(line, end, '^\%([-O(]\|ANY\|EMPTY\)')
      let n += 1
    endwhile
    if token == ""
      return indent + shiftwidth()
    endif

    " Next comes the content model.  If the token we’ve found isn’t a
    " parenthesis it must be either ANY, EMPTY or some random junk.  Either
    " way, we’re done indenting this element, so set it to that of the first
    " line so that the terminating “>” winds up having the same indention.
    if token != '('
      return indent
    endif

    " Now go through the content model.  We need to keep track of the nesting
    " of parentheses.  As soon as we hit 0 we’re done.  If that happens we must
    " have a complete content model.  Thus set indention to be the same as that
    " of the first line so that the terminating “>” winds up having the same
    " indention.  Otherwise, we’ll indent to the innermost parentheses not yet
    " matched.
    let [indent_of_innermost, end] = s:indent_to_innermost_parentheses(line, end)
    if indent_of_innermost != -1
      return indent_of_innermost
    endif

    " Finally, look for any additions and/or exceptions to the content model.
    " This is defined by a “+” or “-” followed by another content model
    " declaration.
    " TODO: Can the “-” be separated by whitespace from the “(”?
    let seen = { '+(': 0, '-(': 0 }
    while 1
      let [additions_exceptions, end] = s:lex(line, end, '^[+-](')
      if additions_exceptions != '+(' && additions_exceptions != '-('
        let [token, end] = s:lex(line, end)
        if token == '>'
          return indent
        endif
        " TODO: Should use s:lex here on getline(v:lnum) and check for >.
        return getline(v:lnum) =~ '^\s*>' || count(values(seen), 0) == 0 ? indent : (indent + shiftwidth())
      endif

      " If we’ve seen an addition or exception already and this is of the same
      " kind, the user is writing a broken DTD.  Time to bail.
      if seen[additions_exceptions]
        return indent
      endif
      let seen[additions_exceptions] = 1

      let [indent_of_innermost, end] = s:indent_to_innermost_parentheses(line, end)
      if indent_of_innermost != -1
        return indent_of_innermost
      endif
    endwhile
  elseif declaration == 'ATTLIST'
    " Check for element name.  If none exists, indent one level.
    let [name, end] = s:lex(line, end)
    if name == ""
      return indent + shiftwidth()
    endif

    " Check for any number of attributes.
    while 1
      " Check for attribute name.  If none exists, indent one level, unless the
      " current line is a lone “>”, in which case we indent to the same level
      " as the first line.  Otherwise, if the attribute name is “>”, we have
      " actually hit the end of the attribute list, in which case we indent to
      " the same level as the first line.
      let [name, end] = s:lex(line, end)
      if name == ""
        " TODO: Should use s:lex here on getline(v:lnum) and check for >.
        return getline(v:lnum) =~ '^\s*>' ? indent : (indent + shiftwidth())
      elseif name == ">"
        return indent
      endif

      " Check for attribute value declaration.  If none exists, indent two
      " levels.  Otherwise, if it’s an enumerated value, check for nested
      " parentheses and indent to the innermost one if we don’t reach the end
      " of the listc.  Otherwise, just continue with looking for the default
      " attribute value.
      " TODO: Do validation of keywords
      " (CDATA|NMTOKEN|NMTOKENS|ID|IDREF|IDREFS|ENTITY|ENTITIES)?
      let [value, end] = s:lex(line, end, '^\%((\|[^[:space:]]\+\)')
      if value == ""
        return indent + shiftwidth() * 2
      elseif value == 'NOTATION'
        " If this is a enumerated value based on notations, read another token
        " for the actual value.  If it doesn’t exist, indent three levels.
        " TODO: If validating according to above, value must be equal to '('.
        let [value, end] = s:lex(line, end, '^\%((\|[^[:space:]]\+\)')
        if value == ""
          return indent + shiftwidth() * 3
        endif
      endif

      if value == '('
        let [indent_of_innermost, end] = s:indent_to_innermost_parentheses(line, end)
        if indent_of_innermost != -1
          return indent_of_innermost
        endif
      endif

      " Finally look for the attribute’s default value.  If non exists, indent
      " two levels.
      let [default, end] = s:lex(line, end, '^\%("\_[^"]*"\|#\(REQUIRED\|IMPLIED\|FIXED\)\)')
      if default == ""
        return indent + shiftwidth() * 2
      elseif default == '#FIXED'
        " We need to look for the fixed value.  If non exists, indent three
        " levels.
        let [default, end] = s:lex(line, end, '^"\_[^"]*"')
        if default == ""
          return indent + shiftwidth() * 3
        endif
      endif
    endwhile
  elseif declaration == 'ENTITY'
    " Check for entity name.  If none exists, indent one level.  Otherwise, if
    " the name actually turns out to be a percent sign, “%”, this is a
    " parameter entity.  Read another token to determine the entity name and,
    " again, if none exists, indent one level.
    let [name, end] = s:lex(line, end)
    if name == ""
      return indent + shiftwidth()
    elseif name == '%'
      let [name, end] = s:lex(line, end)
      if name == ""
        return indent + shiftwidth()
      endif
    endif

    " Now check for the entity value.  If none exists, indent one level.  If it
    " does exist, indent to same level as first line, as we’re now done with
    " this entity.
    "
    " The entity value can be a string in single or double quotes (no escapes
    " to worry about, as entities are used instead).  However, it can also be
    " that this is an external unparsed entity.  In that case we have to look
    " further for (possibly) a public ID and an URI followed by the NDATA
    " keyword and the actual notation name.  For the public ID and URI, indent
    " two levels, if they don’t exist.  If the NDATA keyword doesn’t exist,
    " indent one level.  Otherwise, if the actual notation name doesn’t exist,
    " indent two level.  If it does, indent to same level as first line, as
    " we’re now done with this entity.
    let [value, end] = s:lex(line, end)
    if value == ""
      return indent + shiftwidth()
    elseif value == 'SYSTEM' || value == 'PUBLIC'
      let [quoted_string, end] = s:lex(line, end, '\%("[^"]\+"\|''[^'']\+''\)')
      if quoted_string == ""
        return indent + shiftwidth() * 2
      endif

      if value == 'PUBLIC'
        let [quoted_string, end] = s:lex(line, end, '\%("[^"]\+"\|''[^'']\+''\)')
        if quoted_string == ""
          return indent + shiftwidth() * 2
        endif
      endif

      let [ndata, end] = s:lex(line, end)
      if ndata == ""
        return indent + shiftwidth()
      endif

      let [name, end] = s:lex(line, end)
      return name == "" ? (indent + shiftwidth() * 2) : indent
    else
      return indent
    endif
  elseif declaration == 'NOTATION'
    " Check for notation name.  If none exists, indent one level.
    let [name, end] = s:lex(line, end)
    if name == ""
      return indent + shiftwidth()
    endif

    " Now check for the external ID.  If none exists, indent one level.
    let [id, end] = s:lex(line, end)
    if id == ""
      return indent + shiftwidth()
    elseif id == 'SYSTEM' || id == 'PUBLIC'
      let [quoted_string, end] = s:lex(line, end, '\%("[^"]\+"\|''[^'']\+''\)')
      if quoted_string == ""
        return indent + shiftwidth() * 2
      endif

      if id == 'PUBLIC'
        let [quoted_string, end] = s:lex(line, end, '\%("[^"]\+"\|''[^'']\+''\|>\)')
        if quoted_string == ""
          " TODO: Should use s:lex here on getline(v:lnum) and check for >.
          return getline(v:lnum) =~ '^\s*>' ? indent : (indent + shiftwidth() * 2)
        elseif quoted_string == '>'
          return indent
        endif
      endif
    endif

    return indent
  endif

  " TODO: Processing directives could be indented I suppose.  But perhaps it’s
  " just as well to let the user decide how to indent them (perhaps extending
  " this function to include proper support for whatever processing directive
  " language they want to use).

  " Conditional sections are simply passed along to let Vim decide what to do
  " (and hence the user).
  return -1
endfunction

let &cpo = s:cpo_save
unlet s:cpo_save