/usr/share/vim/vim80/syntax/plp.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | " 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
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
if !exists("main_syntax")
let main_syntax = 'perlscript'
endif
runtime! syntax/html.vim
unlet b:current_syntax
syn include @PLPperl syntax/perl.vim
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"
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