" Vim syntax file
" Language: XML
" Maintainer: Johannes Zellner <[email protected]>
" Author and previous maintainer:
" Paul Siegmann <[email protected]>
" Last Change: 2013 Jun 07
" Filenames: *.xml
" $Id: xml.vim,v 1.3 2006/04/11 21:32:00 vimboss Exp $

" CONFIGURATION:
" syntax folding can be turned on by
"
" let g:xml_syntax_folding = 1
"
" before the syntax file gets loaded (e.g. in ~/.vimrc).
" This might slow down syntax highlighting significantly,
" especially for large files.
"
" CREDITS:
" The original version was derived by Paul Siegmann from
" Claudio Fleiner's html.vim.
"
" REFERENCES:
" [1] http://www.w3.org/TR/2000/REC-xml-20001006
" [2] http://www.w3.org/XML/1998/06/xmlspec-report-19980910.htm
"
" as <[email protected]> pointed out according to reference [1]
"
" 2.3 Common Syntactic Constructs
" [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender
" [5] Name ::= (Letter | '_' | ':') (NameChar)*
"
" NOTE:
" 1) empty tag delimiters "/>" inside attribute values (strings)
" confuse syntax highlighting.
" 2) for large files, folding can be pretty slow, especially when
" loading a file the first time and viewoptions contains 'folds'
" so that folds of previous sessions are applied.
" Don't use 'foldmethod=syntax' in this case.


" Quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif

let s:xml_cpo_save = &cpo
set cpo&vim

syn case match

" mark illegal characters
syn match xmlError "[<&]"

" strings (inside tags) aka VALUES
"
" EXAMPLE:
"
" <tag foo.attribute = "value">
" ^^^^^^^
syn region xmlString contained start=+"+ end=+"+ contains=xmlEntity,@Spell display
syn region xmlString contained start=+'+ end=+'+ contains=xmlEntity,@Spell display


" punctuation (within attributes) e.g. <tag xml:foo.attribute ...>
" ^ ^
" syn match xmlAttribPunct +[-:._]+ contained display
syn match xmlAttribPunct +[:.]+ contained display

" no highlighting for xmlEqual (xmlEqual has no highlighting group)
syn match xmlEqual +=+ display


" attribute, everything before the '='
"
" PROVIDES: @xmlAttribHook
"
" EXAMPLE:
"
" <tag foo.attribute = "value">
" ^^^^^^^^^^^^^
"
syn match xmlAttrib
\ +[-'"<]\@1<!\<[a-zA-Z:_][-.0-9a-zA-Z:_]*\>\%(['">]\@!\|$\)+
\ contained
\ contains=xmlAttribPunct,@xmlAttribHook
\ display


" namespace spec
"
" PROVIDES: @xmlNamespaceHook
"
" EXAMPLE:
"
" <xsl:for-each select = "lola">
" ^^^
"
if exists("g:xml_namespace_transparent")
syn match xmlNamespace
\ +\(<\|</\)\@2<=[^ /!?<>"':]\+[:]\@=+
\ contained
\ contains=@xmlNamespaceHook
\ transparent
\ display
else
syn match xmlNamespace
\ +\(<\|</\)\@2<=[^ /!?<>"':]\+[:]\@=+
\ contained
\ contains=@xmlNamespaceHook
\ display
endif


" tag name
"
" PROVIDES: @xmlTagHook
"
" EXAMPLE:
"
" <tag foo.attribute = "value">
" ^^^
"
syn match xmlTagName
\ +<\@1<=[^ /!?<>"']\++
\ contained
\ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook
\ display


if exists('g:xml_syntax_folding')

" start tag
" use matchgroup=xmlTag to skip over the leading '<'
"
" PROVIDES: @xmlStartTagHook
"
" EXAMPLE:
"
" <tag id="whoops">
" s^^^^^^^^^^^^^^^e
"
syn region xmlTag
\ matchgroup=xmlTag start=+<[^ /!?<>"']\@=+
\ matchgroup=xmlTag end=+>+
\ contained
\ contains=xmlError,xmlTagName,xmlAttrib,xmlEqual,xmlString,@xmlStartTagHook


" highlight the end tag
"
" PROVIDES: @xmlTagHook
" (should we provide a separate @xmlEndTagHook ?)
"
" EXAMPLE:
"
" </tag>
" ^^^^^^
"
syn match xmlEndTag
\ +</[^ /!?<>"']\+>+
\ contained
\ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook


" tag elements with syntax-folding.
" NOTE: NO HIGHLIGHTING -- highlighting is done by contained elements
"
" PROVIDES: @xmlRegionHook
"
" EXAMPLE:
"
" <tag id="whoops">
" <!-- comment -->
" <another.tag></another.tag>
" <empty.tag/>
" some data
" </tag>
"
syn region xmlRegion
\ start=+<\z([^ /!?<>"']\+\)+
\ skip=+<!--\_.\{-}-->+
\ end=+</\z1\_\s\{-}>+
\ matchgroup=xmlEndTag end=+/>+
\ fold
\ contains=xmlTag,xmlEndTag,xmlCdata,xmlRegion,xmlComment,xmlEntity,xmlProcessing,@xmlRegionHook,@Spell
\ keepend
\ extend

else

" no syntax folding:
" - contained attribute removed
" - xmlRegion not defined
"
syn region xmlTag
\ matchgroup=xmlTag start=+<[^ /!?<>"']\@=+
\ matchgroup=xmlTag end=+>+
\ contains=xmlError,xmlTagName,xmlAttrib,xmlEqual,xmlString,@xmlStartTagHook

syn match xmlEndTag
\ +</[^ /!?<>"']\+>+
\ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook

endif


" &entities; compare with dtd
syn match xmlEntity "&[^; \t]*;" contains=xmlEntityPunct
syn match xmlEntityPunct contained "[&.;]"

if exists('g:xml_syntax_folding')

" The real comments (this implements the comments as defined by xml,
" but not all xml pages actually conform to it. Errors are flagged.
syn region xmlComment
\ start=+<!+
\ end=+>+
\ contains=xmlCommentStart,xmlCommentError
\ extend
\ fold

else

" no syntax folding:
" - fold attribute removed
"
syn region xmlComment
\ start=+<!+
\ end=+>+
\ contains=xmlCommentStart,xmlCommentError
\ extend

endif

syn match xmlCommentStart contained "<!" nextgroup=xmlCommentPart
syn keyword xmlTodo contained TODO FIXME XXX
syn match xmlCommentError contained "[^><!]"
syn region xmlCommentPart
\ start=+--+
\ end=+--+
\ contained
\ contains=xmlTodo,@xmlCommentHook,@Spell


" CData sections
"
" PROVIDES: @xmlCdataHook
"
syn region xmlCdata
\ start=+<!\[CDATA\[+
\ end=+]]>+
\ contains=xmlCdataStart,xmlCdataEnd,@xmlCdataHook,@Spell
\ keepend
\ extend

" using the following line instead leads to corrupt folding at CDATA regions
" syn match xmlCdata +<!\[CDATA\[\_.\{-}]]>+ contains=xmlCdataStart,xmlCdataEnd,@xmlCdataHook
syn match xmlCdataStart +<!\[CDATA\[+ contained contains=xmlCdataCdata
syn keyword xmlCdataCdata CDATA contained
syn match xmlCdataEnd +]]>+ contained


" Processing instructions
" This allows "?>" inside strings -- good idea?
syn region xmlProcessing matchgroup=xmlProcessingDelim start="<?" end="?>" contains=xmlAttrib,xmlEqual,xmlString


if exists('g:xml_syntax_folding')

" DTD -- we use dtd.vim here
syn region xmlDocType matchgroup=xmlDocTypeDecl
\ start="<!DOCTYPE"he=s+2,rs=s+2 end=">"
\ fold
\ contains=xmlDocTypeKeyword,xmlInlineDTD,xmlString
else

" no syntax folding:
" - fold attribute removed
"
syn region xmlDocType matchgroup=xmlDocTypeDecl
\ start="<!DOCTYPE"he=s+2,rs=s+2 end=">"
\ contains=xmlDocTypeKeyword,xmlInlineDTD,xmlString

endif

syn keyword xmlDocTypeKeyword contained DOCTYPE PUBLIC SYSTEM
syn region xmlInlineDTD contained matchgroup=xmlDocTypeDecl start="\[" end="]" contains=@xmlDTD
syn include @xmlDTD <sfile>:p:h/dtd.vim
unlet b:current_syntax


" synchronizing
" TODO !!! to be improved !!!

syn sync match xmlSyncDT grouphere xmlDocType +\_.\(<!DOCTYPE\)\@=+
" syn sync match xmlSyncDT groupthere NONE +]>+

if exists('g:xml_syntax_folding')
syn sync match xmlSync grouphere xmlRegion +\_.\(<[^ /!?<>"']\+\)\@=+
" syn sync match xmlSync grouphere xmlRegion "<[^ /!?<>"']*>"
syn sync match xmlSync groupthere xmlRegion +</[^ /!?<>"']\+>+
endif

syn sync minlines=100


" The default highlighting.
hi def link xmlTodo Todo
hi def link xmlTag Function
hi def link xmlTagName Function
hi def link xmlEndTag Identifier
if !exists("g:xml_namespace_transparent")
hi def link xmlNamespace Tag
endif
hi def link xmlEntity Statement
hi def link xmlEntityPunct Type

hi def link xmlAttribPunct Comment
hi def link xmlAttrib Type

hi def link xmlString String
hi def link xmlComment Comment
hi def link xmlCommentStart xmlComment
hi def link xmlCommentPart Comment
hi def link xmlCommentError Error
hi def link xmlError Error

hi def link xmlProcessingDelim Comment
hi def link xmlProcessing Type

hi def link xmlCdata String
hi def link xmlCdataCdata Statement
hi def link xmlCdataStart Type
hi def link xmlCdataEnd Type

hi def link xmlDocTypeDecl Function
hi def link xmlDocTypeKeyword Statement
hi def link xmlInlineDTD Function

let b:current_syntax = "xml"

let &cpo = s:xml_cpo_save
unlet s:xml_cpo_save

" vim: ts=8