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lex.vim
" 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
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