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" Vim indent file
" Language: DTD (Document Type Definition for XML)
" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
" Latest Revision: 2011-07-08
let s:cpo_save = &cpo
set cpo&vim
setlocal indentexpr=GetDTDIndent()
setlocal indentkeys=!^F,o,O,>
setlocal nosmartindent
if exists("*GetDTDIndent")
finish
endif
" 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