neovim/runtime/syntax/plp.vim

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" Vim syntax file
" Language: PLP (Perl in HTML)
" Maintainer: Juerd <juerd@juerd.nl>
" Last Change: 2003 Apr 25
" Cloned From: aspperl.vim
" Add to filetype.vim the following line (without quote sign):
" au BufNewFile,BufRead *.plp setf plp
" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
syntax clear
elseif exists("b:current_syntax")
finish
endif
if !exists("main_syntax")
let main_syntax = 'perlscript'
endif
if version < 600
so <sfile>:p:h/html.vim
syn include @PLPperl <sfile>:p:h/perl.vim
else
runtime! syntax/html.vim
unlet b:current_syntax
syn include @PLPperl syntax/perl.vim
endif
syn cluster htmlPreproc add=PLPperlblock
syn keyword perlControl PLP_END
syn keyword perlStatementInclude include Include
syn keyword perlStatementFiles ReadFile WriteFile Counter
syn keyword perlStatementScalar Entity AutoURL DecodeURI EncodeURI
syn cluster PLPperlcode contains=perlStatement.*,perlFunction,perlOperator,perlVarPlain,perlVarNotInMatches,perlShellCommand,perlFloat,perlNumber,perlStringUnexpanded,perlString,perlQQ,perlControl,perlConditional,perlRepeat,perlComment,perlPOD,perlHereDoc,perlPackageDecl,perlElseIfError,perlFiledescRead,perlMatch
syn region PLPperlblock keepend matchgroup=Delimiter start=+<:=\=+ end=+:>+ transparent contains=@PLPperlcode
syn region PLPinclude keepend matchgroup=Delimiter start=+<(+ end=+)>+
let b:current_syntax = "plp"