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" Vim syntax file
" Language: Lex and Flex
" Maintainer: Charles E. Campbell <NcampObell@SdrPchip.AorgM-NOSPAM>
" Contributor: Robert A. van Engelen <engelen@acm.org>
" Last Change: Apr 24, 2020
" Version: 18
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
" Read the C++ syntax to start with
let s:Cpath= fnameescape(expand("<sfile>:p:h")."/cpp.vim")
if !filereadable(s:Cpath)
for s:Cpath in split(globpath(&rtp,"syntax/cpp.vim"),"\n")
if filereadable(fnameescape(s:Cpath))
let s:Cpath= fnameescape(s:Cpath)
break
endif
endfor
endif
exe "syn include @lexCcode ".s:Cpath
" --- ========= ---
" --- Lex stuff ---
" --- ========= ---
" Definitions
" %%
" Rules
" %%
" User Code
"
" --- ======= ---
" --- Example ---
" --- ======= ---
"
" // this is a valid lex file
" // indented initial code block
" #include <stdlib.h>
" %{
" // initial code block
" #include <stdio.h>
" const char *sep = "";
" %}
" %option outfile="scanner.c" noyywrap nodefault
" %x COMMENT
" id [A-Za-z_][A-Za-z0-9_]*
" %%
" // indented initial action code block
" printf("BEGIN");
" {id} printf("%s%s", sep, yytext); sep = "";
" . |
" \n { sep = "\n"; }
" "/*" { BEGIN COMMENT; }
" "//".* { }
" <COMMENT>{
" "*/" { BEGIN INITIAL; }
" .|\n
" }
" <*><<EOF>> { // end of file
" printf("\nEND\n");
" yyterminate();
" }
" %%
" void scan()
" {
" while (yylex())
" continue;
" }
" /* main program */
" int main()
" {
" scan();
" }
" Definitions Section with initial code blocks, abbreviations, options, states
if has("folding")
syn region lexAbbrvBlock fold start="^\S" end="^\ze%%" skipnl nextgroup=lexPatBlock contains=lexOptions,lexAbbrv,lexInitialCodeBlock,lexInclude,lexAbbrvComment,lexStartState
else
syn region lexAbbrvBlock start="^\S" end="^\ze%%" skipnl nextgroup=lexPatBlock contains=lexOptions,lexAbbrv,lexInitialCodeBlock,lexInclude,lexAbbrvComment,lexStartState
endif
syn match lexOptions "^%\a\+\(\s.*\|[^{]*\)$" contains=lexOptionsEq,lexPatString,lexSlashQuote,lexBrace,lexSlashBrace
syn match lexOptionsEq "=" skipwhite contained
syn match lexAbbrv "^\I\i*\s"me=e-1 skipwhite contained nextgroup=lexAbbrvPat
syn match lexAbbrvPat "\s\S.*$"lc=1 contained contains=lexPatAbbrv,lexPatString,lexSlashQuote,lexBrace,lexSlashBrace nextgroup=lexAbbrv,lexInclude
syn match lexStartState "^%\(xs\?\|s\)\(t\(a\(t\(e\?\)\?\)\?\)\?\)\?\(\s\+\I\i*\)\+\s*$" contained contains=lexStartStateCmd
syn match lexStartStateCmd '^%\(xs\?\|s\)\(t\(a\(t\(e\?\)\?\)\?\)\?\)\?' contained
if has("folding")
syn region lexInitialCodeBlock fold start="^\s\+" end="^\S"me=e-1 contains=@lexCcode
syn region lexInclude fold matchgroup=lexSep start="^%\a*{" end="^%\?}" contained contains=@lexCcode,lexCFunctions
syn region lexAbbrvComment fold start="^\s*//" end="$" contains=@Spell
syn region lexAbbrvComment fold start="^\s*/\*" end="\*/" contains=@Spell
else
syn region lexInitialCodeBlock start="^\s\+" end="^\S"me=e-1 contains=@lexCcode
syn region lexInclude matchgroup=lexSep start="^%\a*{" end="^%\?}" contained contains=@lexCcode,lexCFunctions
syn region lexAbbrvComment start="^\s*//" end="$" contains=@Spell
syn region lexAbbrvComment start="^\s*/\*" end="\*/" contains=@Spell
endif
" Rules Section with patterns and actions
if has("folding")
syn region lexPatBlock fold matchgroup=Todo start="^%%" matchgroup=Todo end="^\ze%%" skipnl skipwhite nextgroup=lexFinalCodeBlock contains=lexPatTag,lexPatTagZone,lexPatComment,lexPat,lexPatSep,lexPatInclude
syn region lexPat fold start="\S" skip="\\\\\|\\\s" end="\ze\(\s*$\|\s\+\(\h\|{\W\|{$\|[-+*]\|//\|/\*\)\)" skipwhite contained nextgroup=lexMorePat,lexPatSep,lexPatEnd contains=lexPatTag,lexPatString,lexSlashQuote,lexPatAbbrv,lexBrace,lexSlashBrace
syn region lexPatInclude fold matchgroup=lexSep start="^%{" end="^%}" contained contains=@lexCcode
syn region lexBrace fold matchgroup=Character start="\[" skip="\\.\|\[:\a\+:\]\|\[\.\a\+\.\]\|\[=.=\]" end="\]" contained
syn region lexPatString fold matchgroup=String start=+"+ skip=+\\\\\|\\"+ matchgroup=String end=+"+ contained
else
syn region lexPatBlock matchgroup=Todo start="^%%" matchgroup=Todo end="^\ze%%" skipnl skipwhite nextgroup=lexFinalCodeBlock contains=lexPatTag,lexPatTagZone,lexPatComment,lexPat,lexPatSep,lexPatInclude
syn region lexPat start="\S" skip="\\\\\|\\\s" end="\ze\(\s*$\|\s\+\(\h\|{\W\|{$\|[-+*]\|//\|/\*\)\)" skipwhite contained nextgroup=lexMorePat,lexPatSep,lexPatEnd contains=lexPatTag,lexPatString,lexSlashQuote,lexPatAbbrv,lexBrace,lexSlashBrace
syn region lexPatInclude matchgroup=lexSep start="^%{" end="^%}" contained contains=@lexCcode
syn region lexBrace matchgroup=Character start="\[" skip="\\.\|\[:\a\+:\]\|\[\.\a\+\.\]\|\[=.=\]" end="\]" contained
syn region lexPatString matchgroup=String start=+"+ skip=+\\\\\|\\"+ matchgroup=String end=+"+ contained
endif
syn match lexPatAbbrv "{\I\i*}"hs=s+1,he=e-1 contained
syn match lexPatTag "^<\^\?\(\I\i*\|\*\)\(,\^\?\(\I\i*\|\*\)\)*>" contained nextgroup=lexPat,lexMorePat,lexPatSep,lexPatEnd
syn match lexPatTagZone "^<\^\?\(\I\i*\|\*\)\(,\^\?\(\I\i*\|\*\)\)*>\s*{$"me=e-1 contained nextgroup=lexPatTagZoneStart
if has("folding")
syn region lexPatTagZoneStart fold matchgroup=lexPatTag start='{$' end='^}' skipnl skipwhite contained contains=lexPatTag,lexPatTagZone,lexPatComment,lexPat,lexPatSep,lexPatInclude
syn region lexPatComment fold start="//" end="$" skipnl contained contains=cTodo skipwhite nextgroup=lexPatComment,lexPat,@Spell
syn region lexPatComment fold start="/\*" end="\*/" skipnl contained contains=cTodo skipwhite nextgroup=lexPatComment,lexPat,@Spell
else
syn region lexPatTagZoneStart matchgroup=lexPatTag start='{' end='^}' skipnl skipwhite contained contains=lexPatTag,lexPatTagZone,lexPatComment,lexPat,lexPatSep,lexPatInclude
syn region lexPatComment start="//" end="$" skipnl contained contains=cTodo skipwhite nextgroup=lexPatComment,lexPat,@Spell
syn region lexPatComment start="/\*" end="\*/" skipnl contained contains=cTodo skipwhite nextgroup=lexPatComment,lexPat,@Spell
endif
syn match lexPatEnd "\s*$" skipnl contained
syn match lexPatCodeLine "[^{\[].*" contained contains=@lexCcode,lexCFunctions
syn match lexMorePat "\s*|\s*$" skipnl contained nextgroup=lexPat,lexPatTag,lexPatComment
syn match lexPatSep "\s\+" contained nextgroup=lexMorePat,lexPatCode,lexPatCodeLine
syn match lexSlashQuote +\(\\\\\)*\\"+ contained
syn match lexSlashBrace +\(\\\\\)*\\\[+ contained
if has("folding")
syn region lexPatCode fold matchgroup=Delimiter start="{" end="}" skipnl contained contains=@lexCcode,lexCFunctions
else
syn region lexPatCode matchgroup=Delimiter start="{" end="}" skipnl contained contains=@lexCcode,lexCFunctions
endif
" User Code Section with final code block
syn region lexFinalCodeBlock matchgroup=Todo start="^%%" end="\%$" contained contains=@lexCcode
" Lex macros which may appear in C/C++ code blocks
syn keyword lexCFunctions BEGIN ECHO REJECT yytext YYText yyleng YYLeng yymore yyless yywrap yylook
syn keyword lexCFunctions yyrestart yyterminate yylineno yycolumno yyin yyout
syn keyword lexCFunctions input unput output winput wunput woutput
syn keyword lexCFunctions yyinput yyunput yyoutput yywinput yywunput yywoutput
" <c.vim> includes several ALLBUTs; these have to be treated so as to exclude lex* groups
syn cluster cParenGroup add=lex.*
syn cluster cDefineGroup add=lex.*
syn cluster cPreProcGroup add=lex.*
syn cluster cMultiGroup add=lex.*
" Synchronization
syn sync clear
syn sync minlines=500
syn sync match lexSyncPat grouphere lexPatBlock "^%[a-zA-Z]"
syn sync match lexSyncPat groupthere lexPatBlock "^<$"
syn sync match lexSyncPat groupthere lexPatBlock "^%%"
" The default highlighting.
if !exists("skip_lex_syntax_inits")
hi def link lexAbbrvComment lexPatComment
hi def link lexAbbrvPat lexPat
hi def link lexAbbrv Special
hi def link lexBrace lexPat
hi def link lexCFunctions PreProc
hi def link lexMorePat Special
hi def link lexOptions PreProc
hi def link lexOptionsEq Operator
hi def link lexPatComment Comment
hi def link lexPat Function
hi def link lexPatString lexPat
hi def link lexPatAbbrv Special
hi def link lexPatTag Statement
hi def link lexPatTagZone lexPatTag
hi def link lexSep Delimiter
hi def link lexSlashQuote lexPat
hi def link lexSlashBrace lexPat
hi def link lexStartState lexPatTag
hi def link lexStartStateCmd Special
endif
let b:current_syntax = "lex"
" vim:ts=8