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Langue: ja
Version: April 1995 (openSuse - 09/10/07)
Section: 1 (Commandes utilisateur)
Sommaire
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int num_lines = 0, num_chars = 0;
%}
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. ++num_chars;
%%
main()
{
yylex();
printf( "# of lines = %d, # of chars = %d\n",
num_lines, num_chars );
}
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/* scanner for a toy Pascal-like language */
%{
/* need this for the call to atof() below */
#include <math.h>
%}
DIGIT [0-9]
ID [a-z][a-z0-9]*
%%
{DIGIT}+ {
printf( "An integer: %s (%d)\n", yytext,
atoi( yytext ) );
}
{DIGIT}+"."{DIGIT}* {
printf( "A float: %s (%g)\n", yytext,
atof( yytext ) );
}
if|then|begin|end|procedure|function {
printf( "A keyword: %s\n", yytext );
}
{ID} printf( "An identifier: %s\n", yytext );
"+"|"-"|"*"|"/" printf( "An operator: %s\n", yytext );
"{"[^}\n]*"}" /* eat up one-line comments */
[ \t\n]+ /* eat up whitespace */
. printf( "Unrecognized character: %s\n", yytext );
%%
main( argc, argv )
int argc;
char **argv;
{
++argv, --argc; /* skip over program name */
if ( argc > 0 )
yyin = fopen( argv[0], "r" );
else
yyin = stdin;
yylex();
}
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- REJECT ÆþÎÏ(¤â¤·¤¯¤ÏÆþÎϤÎƬ)¤Ë "2 ÈÖÌܤˤ褯(second best)" ¥Þ¥Ã¥Á¤¹¤ë¥ë¡¼¥ë ¤Ë¿Ê¤à¤è¤¦¤Ë¥¹¥¥ã¥Ê¤Ë»Ø¼¨¤·¤Þ¤¹¡£ "ÆþÎϤΥޥåÁÊýË¡" ¤Ç¼¨¤·¤¿¤è¤¦¤Ë¥ë¡¼¥ë¤ÏÁªÂò¤µ¤ì¡¢ yytext ¤È yyleng ¤ÏŬÀÚ¤ËÀßÄꤵ¤ì¤Þ¤¹¡£ ÁªÂò¤µ¤ì¤ë¥ë¡¼¥ë¤Ï¡¢ºÇ½é¤ËÁªÂò¤µ¤ì¤¿¥ë¡¼¥ë¤ÈƱ¤¸Ä¹¤µ¤Ç¤¢¤ë¤¬ flex ¤ÎÆþÎÏ¥Õ¥¡¥¤¥ë¤Ë¤Æ¸å¤Ç½Ð¤ÆÍè¤ë¤â¤Î¡¢¤â¤·¤¯¤Ï¾¯¤Ê¤¤Ê¸»ú¿ô¤Ë¥Þ¥Ã¥Á¤¹¤ë¤â¤Î¤Ç¤¹¡£ Î㤨¤Ð¼¡¤ÎÎã¤Ç¤ÏÆþÎÏÃæ¤Î¸ì¤ò¿ô¤¨¡¢ "frob" ¤¬¸«ÉÕ¤«¤ë¤¿¤Ó¤Ë¥ë¡¼¥Á¥ó special() ¤ò¸Æ¤Ó¤Þ¤¹:
int word_count = 0; %% frob special(); REJECT; [^ \t\n]+ ++word_count;REJECT ¤¬Ìµ¤¤¾ì¹ç¡¢ ÆþÎÏÃæ¤Î "frob" ¤Ï¸ì¤È¤·¤Æ¿ô¤¨¤é¤ì¤º¡¢ ¥¹¥¥ã¥Ê¤ÏÄ̾ïÄ̤ê¥È¡¼¥¯¥óËè¤Ë 1 ¤Ä¤Î¥¢¥¯¥·¥ç¥ó¤À¤±¤ò¹Ô¤¤¤Þ¤¹¡£ Ê£¿ô¤Î REJECT ¤ò»ÈÍѲÄǽ¤Ç¤¢¤ê¡¢¤½¤ì¤¾¤ì¸½ºß͸ú¤Ê¥ë¡¼¥ë¤Î¼¡¤ËÎɤ¤ÁªÂò¤ò¸«ÉÕ¤±¤Þ¤¹¡£ Î㤨¤Ð¼¡¤Î¥¹¥¥ã¥Ê¤Ï¡¢"abcd" ¤È¤¤¤¦¥È¡¼¥¯¥ó¤ò¥¹¥¥ã¥ó¤·¡¢ ½ÐÎÏ¤Ë "abcdabcaba" ¤ò½ñ¤¤Þ¤¹:%% a | ab | abc | abcd ECHO; REJECT; .|\n /* eat up any unmatched character */(Á°¤Î 3 ¤Ä¤Î¥ë¡¼¥ë¤Ï 4 ÈÖÌܤΥ롼¥ë¤Î¥¢¥¯¥·¥ç¥ó¤ò¶¦Í¤·¤Þ¤¹¡£ ¤Ê¤¼¤Ê¤éÆÃÊÌ¤Ê '|' ¥¢¥¯¥·¥ç¥ó¤¬»ÈÍѤµ¤ì¤Æ¤¤¤ë¤«¤é¤Ç¤¹¡£) REJECT ¤Ï¥¹¥¥ã¥Ê¤ÎÀǽ¤È¤¤¤¦ÅÀ¤ÇÆä˥³¥¹¥È¤Î¤«¤«¤ëµ¡Ç½¤Ç¤¹; ¤â¤·¥¹¥¥ã¥Ê¤Î¥¢¥¯¥·¥ç¥ó¤Î ¤¤¤º¤ì¤« ¤Ë¤Ç¤â REJECT ¤¬»È¤ï¤ì¤¿¤Ê¤é¡¢¥¹¥¥ã¥Ê¤Î Á´¤Æ¤Î ¥Þ¥Ã¥Á¥ó¥°Â®ÅÙ¤òÄã²¼¤µ¤»¤ë¤È¤¤¤¦¤³¤È¤Ç¤¹¡£ ¤µ¤é¤Ë REJECT ¤ò¥ª¥×¥·¥ç¥ó -Cf ¤ä -CF ¤È¶¦¤ËÍѤ¤¤ë¤³¤È¤Ï½ÐÍè¤Þ¤»¤ó¡£ - ¤Þ¤¿¡¢Â¾¤ÎÆÃÊÌ¥¢¥¯¥·¥ç¥ó¤È°ã¤¤ REJECT ¤Ï ʬ´ô(branch) ¤Ç¤¢¤ë¤³¤È¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤; ¤¹¤Ê¤ï¤Á REJECT ľ¸å¤Î¥¢¥¯¥·¥ç¥ó¤Ï ¼Â¹Ô ¤µ¤ì¤Þ¤»¤ó¡£
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- yymore() ¼¡¤Ë¥ë¡¼¥ë¤È¥Þ¥Ã¥Á¤·¤¿¤È¤¤Ë¤Ï¡¢Âбþ¤¹¤ë¥È¡¼¥¯¥ó¤Ï¡¢ ¸½ºß¤Î yytext ¤ÎÆâÍƤÈÆþ¤ì´¹¤¨¤ë¤Î¤Ç¤Ï¤Ê¤¯ yytext ¤Ë Äɲà ¤¹¤ë¤è¤¦¥¹¥¥ã¥Ê¤Ë»Ø¼¨¤·¤Þ¤¹¡£ Î㤨¤Ð¡¢ÆþÎÏ "mega-kludge" ¤¬Í¿¤¨¤é¤ì¤ë¤È¡¢°Ê²¼¤Ï "mega-mega-kludge" ¤ò½ÐÎϤ˽ñ¤¤Þ¤¹:
%% mega- ECHO; yymore(); kludge ECHO;ºÇ½é¤Î "mega-" ¤Ï¥Þ¥Ã¥Á¤·½ÐÎϤ˥¨¥³¡¼¤µ¤ì¤Þ¤¹¡£ ¼¡¤Ë "kludge" ¤¬¥Þ¥Ã¥Á¤·¤Þ¤¹¤¬¡¢Ä¾Á°¤Î "mega-" ¤¬¤Þ¤À yytext ¤ÎÀèƬ¤Ë»Ä¤Ã¤Æ¤ª¤ê¡¢"kludge" ¤Î ECHO ¥ë¡¼¥ë¤Ï¼ÂºÝ¤Ë¤Ï "mage-kludge" ¤ò½ñ¤¤Þ¤¹¡£
yymore() ¤Î»ÈÍѤ˴ؤ· 2 ¤Ä¤ÎÃí°ÕÅÀ¤¬¤¢¤ê¤Þ¤¹¡£ ¤Þ¤º¡¢ yymore() ¤Ï¸½ºß¤Î¥È¡¼¥¯¥ó¤ÎÂ礤µ¤òÈ¿±Ç¤¹¤ë yyleng ¤ÎÃͤÎÀµ³Î¤µ¤Ë°Í¸¤¹¤ë¤³¤È¤Ç¤¢¤ê¡¢ yymore() »ÈÍÑ»þ¤Ë¤Ï yyleng ¤òÊѹ¹¤·¤Æ¤Ï¤Ê¤ê¤Þ¤»¤ó¡£ ¼¡¤Ë¡¢ ¥¹¥¥ã¥Ê¤Î¥¢¥¯¥·¥ç¥ó¤Ë yymore() ¤¬¤¢¤ë¤È¡¢¥¹¥¥ã¥Ê¤Î¥Þ¥Ã¥Á®Å٤˼㴳°±Æ¶Á¤¬¤¢¤ê¤Þ¤¹¡£
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- yyless(n) ¸½ºß¤Î¥È¡¼¥¯¥ó¤«¤éºÇ½é¤Î n ʸ»ú¤ò½ü¤¤¤¿¤â¤Î¤òÆþÎÏ¥¹¥È¥ê¡¼¥à¤ËÌᤷ¤Þ¤¹¡£ Ìᤷ¤¿Ê¸»úÎó¤Ï¥¹¥¥ã¥Ê¤¬¼¡¤Î¥Þ¥Ã¥Á¥ó¥°¤ò¤È¤ë¤È¤¤ËºÆÅÙ¥¹¥¥ã¥ó¤µ¤ì¤Þ¤¹¡£ yytext ¤È yyleng ¤ÏŬÀÚ¤ËÄ´À°¤µ¤ì¤Þ¤¹(Î㤨¤Ð yyleng ¤Ï n ¤È¤Ê¤ê¤Þ¤¹)¡£ Î㤨¤Ð¡¢ÆþÎÏ "foobar" ¤¬Í¿¤¨¤é¤ì¤ë¤È¡¢°Ê²¼¤Ï "foobarbar" ¤ò½ñ¤¤Þ¤¹:
%% foobar ECHO; yyless(3); [a-z]+ ECHO;°ú¿ô 0 ¤ò yyless ¤ËÍ¿¤¨¤ë¤È¡¢¸½ºß¤ÎÆþÎÏʸ»úÎóÁ´ÂΤ¬ºÆÅÙ¥¹¥¥ã¥ó¤µ¤ì¤Þ¤¹¡£ (Î㤨¤Ð BEGIN ¤ò»ÈÍѤ·¤Æ)¼¡¤Ë¥¹¥¥ã¥Ê¤¬ÆþÎϤ¹¤ëÊýË¡¤òÊѹ¹¤·¤Æ¤¤¤Ê¤¤¤È¡¢Ìµ¸Â¥ë¡¼¥×¤È¤Ê¤ê¤Þ¤¹¡£
yyless ¤Ï¥Þ¥¯¥í¤Ç¤¢¤ê¡¢flex ÆþÎÏ¥Õ¥¡¥¤¥ë¤Ç¤Î¤ß»ÈÍѲÄǽ¤Ç¤¢¤ê¡¢ Ê̤Υ½¡¼¥¹¥Õ¥¡¥¤¥ë¤«¤é¤Ï»ÈÍÑÉÔǽ¤Ç¤¢¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£
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- unput(c) ʸ»ú c ¤òÆþÎÏ¥¹¥È¥ê¡¼¥à¤ØÌᤷ¤Þ¤¹¡£Ìᤷ¤¿Ê¸»ú¤Ï¼¡¤Ë¥¹¥¥ã¥ó¤µ¤ì¤ëʸ»ú¤Ë¤Ê¤ê¤Þ¤¹¡£ ¼¡¤Î¥¢¥¯¥·¥ç¥ó¤Ï¸½ºß¤Î¥È¡¼¥¯¥ó¤ò¼è¤ê¾å¤²¡¢ ³ç¸ÌÆâ¤ËÆþ¤ì¤ÆºÆ¥¹¥¥ã¥ó¤·¤Þ¤¹¡£
{ int i; /* Copy yytext because unput() trashes yytext */ char *yycopy = strdup( yytext ); unput( ')' ); for ( i = yyleng - 1; i >= 0; --i ) unput( yycopy[i] ); unput( '(' ); free( yycopy ); }unput() ¤Ïʸ»ú¤òÆþÎÏ¥¹¥È¥ê¡¼¥à¤Î ÀèƬ ¤ËÌ᤹¤Î¤Ç¡¢Ê¸»úÎó¤òÌ᤹¾ì¹ç¤Ë¤Ï¸å¤í¤«¤éÁ°¤Ë¸þ¤«¤Ã¤ÆÌ᤹ɬÍפ¬¤¢¤ê¤Þ¤¹¡£
unput() »ÈÍÑ»þ¤Î½ÅÍפÊÀøºßŪ¤ÊÌäÂê¤Ï¡¢ %pointer »ÈÍÑ»þ(¥Ç¥Õ¥©¥ë¥È)¤Ë unput() ¤ò¸Æ¤Ó½Ð¤¹¤È¡¢ ±¦Ã¼¤Îʸ»ú¤«¤é³«»Ï¤· 1 ʸ»ú¤º¤Äº¸¤Ë¸þ¤«¤Ã¤Æ¾ÃÈñ¤µ¤ì¡¢ yytext ¤ÎÆâÍƤ¬ Ç˲õ ¤µ¤ì¤ë¤³¤È¤Ç¤¹¡£ (¾åµÎã¤Î¤è¤¦¤Ë) unput() ¸Æ¤Ó½Ð¤·¸å¤â yytext ¤ÎÆâÍƤòÊݸ¤¹¤ë¤¿¤á¤Ë¤Ï¡¢»Ï¤á¤ËÊ̤ξì½ê¤Ë¥³¥Ô¡¼¤¹¤ë¤«¡¢ ¥¹¥¥ã¥Ê¤ò %array ¤ò»È¤¦¤è¤¦¤Ë¹½ÃÛ¤¹¤ë¤³¤È¤Ç¤¹(ÆþÎϤΥޥåÁÊýË¡»²¾È)¡£
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- input() ¼¡¤Îʸ»ú¤òÆþÎÏ¥¹¥È¥ê¡¼¥à¤«¤éÆɤߤޤ¹¡£ ¼¡¤ÎÎã¤Ï C ¥³¥á¥ó¥È¤ò¿©¤Ù¤Þ¤¹:
%% "/*" { register int c; for ( ; ; ) { while ( (c = input()) != '*' && c != EOF ) ; /* eat up text of comment */ if ( c == '*' ) { while ( (c = input()) == '*' ) ; if ( c == '/' ) break; /* found the end */ } if ( c == EOF ) { error( "EOF in comment" ); break; } } }(¥¹¥¥ã¥Ê¤¬ C++ ¤Ç¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¤È¤¤Ï¡¢¤³¤Î¥ë¡¼¥Á¥ó¤Ï yyinput() ¤È¤¤¤¦Ì¾¾Î¤Ë¤Ê¤ê¡¢ C++ ¥¹¥È¥ê¡¼¥à¤Î input ¤È̾Á°¤¬¾×Æͤ¹¤ë¤³¤È¤òÈò¤±¤Þ¤¹¡£) - -
- YY_FLUSH_BUFFER ¥¹¥¥ã¥Ê¤ÎÆâÉô¥Ð¥Ã¥Õ¥¡¤ò¥Õ¥é¥Ã¥·¥å¤·¡¢ ¼¡¤Ë¥¹¥¥ã¥Ê¤¬¥È¡¼¥¯¥ó¤ò¥Þ¥Ã¥Á¤·¤è¤¦¤È¤·¤¿»þ ¥Ð¥Ã¥Õ¥¡¤ò YY_INPUT ¤Ë¤Æ¥ê¥Õ¥£¥ë¤·¤Þ¤¹(À¸À®¤µ¤ì¤¿¥¹¥¥ã¥Ê¤Ç¸å½Ò)¡£ ¤³¤Î¥¢¥¯¥·¥ç¥ó¤Ï¡¢ Ê£¿ô¤ÎÆþÎϥХåե¡¤Ë¤ª¤¤¤Æ¸å½Ò¤¹¤ë ¤è¤ê°ìÈÌŪ¤Ê yy_flush_buffer() ´Ø¿ô¤ÎÆÃÊ̤ʥ±¡¼¥¹¤Ç¤¹¡£
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- yyterminate() ¥¢¥¯¥·¥ç¥ó¤Î return ʸ¤ÎÂå¤ï¤ê¤Ë»È¤¦¤³¤È¤¬½ÐÍè¤Þ¤¹¡£ yyterminate() ¤Ï¥¹¥¥ã¥Ê¤ò½ªÎ»¤·¡¢"Á´¤Æ½ªÎ»" ¤ò°ÕÌ£¤¹¤ë 0 ¤ò¸Æ¤Ó½Ð¤·¸µ´Ø¿ô¤ËÊÖ¤·¤Þ¤¹¡£ ¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï yyterminate() ¤Ï¥Õ¥¡¥¤¥ë¤Î½ª¤ï¤ê¤Ë㤷¤¿¤È¤¤Ë¤â¸Æ¤Ð¤ì¤Þ¤¹¡£ yyterminate() ¤Ï¥Þ¥¯¥í¤Ç¤¢¤ê¡¢ÄêµÁ¤·¤Ê¤ª¤¹¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
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flex ¤Î½ÐÎÏ¤Ï lex.yy.c ¤È¤¤¤¦¥Õ¥¡¥¤¥ë¤Ç¤¢¤ê¡¢¥¹¥¥ã¥ó¥ë¡¼¥Á¥ó yylex() ¤È¡¢¥È¡¼¥¯¥ó¤Î¥Þ¥Ã¥Á¥ó¥°¤Ë»ÈÍѤ¹¤ëÊ£¿ô¤Î¥Æ¡¼¥Ö¥ë¤È¡¢ Ê£¿ô¤ÎÉÕ°¥ë¡¼¥Á¥ó¤È¥Þ¥¯¥í¤«¤é¤Ê¤ê¤Þ¤¹¡£¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢ yylex() ¤Ï¼¡¤Î¤è¤¦¤ËÀë¸À¤µ¤ì¤Þ¤¹:
int yylex()
{
... various definitions and the actions in here ...
}
(´Ä¶¤¬´Ø¿ô¥×¥í¥È¥¿¥¤¥×¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¾ì¹ç¡¢ "int yylex( void )" ¤È¤Ê¤ê¤Þ¤¹¡£) ¤³¤ÎÄêµÁ¤Ï "YY_DECL" ¥Þ¥¯¥í¤òÄêµÁ¤¹¤ë¤³¤È¤Ë¤è¤êÊѹ¹¤Ç¤¤Þ¤¹¡£ Î㤨¤Ð¼¡¤Î¤è¤¦¤Ë»ÈÍѤ¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹:
#define YY_DECL float lexscan( a, b ) float a, b;
¤³¤ì¤Ï¥¹¥¥ã¥ó¥ë¡¼¥Á¥ó¤Î̾Á°¤ò lexscan ¤È¤·¡¢ÉâÆ°¾®¿ôÅÀ¿ô¤òÊÖ¤¹¤è¤¦¤Ë¤·¡¢2 ¤Ä¤ÎÉâÆ°¾®¿ôÅÀ¿ô¤ò°ú¿ô¤È¤·¤Þ¤¹¡£ K&R ¤ÎÈó¥×¥í¥È¥¿¥¤¥×¤Î´Ø¿ôÀë¸À¤ò»ÈÍѤ·¤Æ¥¹¥¥ã¥ó¥ë¡¼¥Á¥ó¤ËÂФ·¤Æ°ú¿ô¤ò Í¿¤¨¤ë¾ì¹ç¡¢ÄêµÁ¤ò¥»¥ß¥³¥í¥ó(;)¤Ç½ªÎ»¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£ yylex() ¤Ï¸Æ¤Ð¤ì¤ë¤¿¤Ó¡¢¥°¥í¡¼¥Ð¥ëÆþÎÏ¥Õ¥¡¥¤¥ë yyin (¥Ç¥Õ¥©¥ë¥È¤Ç¤Ïɸ½àÆþÎÏ)¤«¤é¥È¡¼¥¯¥ó¤ò¥¹¥¥ã¥ó¤·¤Þ¤¹¡£ ¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤Ë¤Ê¤ë(¤³¤Î¾ì¹ç 0 ¤òÊÖ¤·¤Þ¤¹)¤«¡¢ ¥¢¥¯¥·¥ç¥ó¤¬ return ʸ¤ò¼Â¹Ô¤¹¤ë¤Þ¤Ç¡¢¼Â¹Ô¤ò³¤±¤Þ¤¹¡£
¥¹¥¥ã¥Ê¤¬¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤ËÅþ㤹¤ë¤È¡¢ yyin ¤¬¿·¤¿¤Ê¥Õ¥¡¥¤¥ë¤ò»Ø¤µ¤Ê¤¤¤« (¿·¤¿¤Ê¥Õ¥¡¥¤¥ë¤ò»Ø¤¹¾ì¹ç¤Ï¤³¤Î¥Õ¥¡¥¤¥ë¤Î¥¹¥¥ã¥ó¤ò³¤±¤Þ¤¹)¡¢ yyrestart() ¤¬¸Æ¤Ð¤ì¤Ê¤¤¸Â¤ê¡¢ ¸å³¤¹¤ë¸Æ¤Ó½Ð¤·¤Ï̤ÄêµÁ¤Ç¤¹¡£ yyrestart() ¤Ï FILE * ¥Ý¥¤¥ó¥¿( YY_INPUT ¤òÀßÄꤷ¤Æ yyin °Ê³°¤Î¥½¡¼¥¹¤ò¥¹¥¥ã¥ó¤¹¤ë¤è¤¦¤Ë¤·¤¿¾ì¹ç¤Ë¤Ï nil ¤â²Ä¤Ç¤¹) ¤Ç¤¢¤ë°ú¿ô¤ò 1 ¤Ä¤È¤ê¡¢¤½¤Î¥Õ¥¡¥¤¥ë¤«¤é¤Î¥¹¥¥ã¥ó¤Î¤¿¤á¤Ë yyin ¤ò½é´ü²½¤·¤Þ¤¹¡£ ËܼÁŪ¤Ë¡¢ yyin ¤ò¿·¤·¤¤ÆþÎÏ¥Õ¥¡¥¤¥ë¤Ë³ä¤êÅö¤Æ¤ë¤³¤È¤È yyrestar() ¤ò»ÈÍѤ¹¤ë¤³¤È¤È¤ÏƱ¤¸¤Ç¤¹; ¸å¼Ô¤ÏÁ°¤Î¥Ð¡¼¥¸¥ç¥ó¤Î flex ¤È¤Î¸ß´¹À¤Î¤¿¤á¤Ë»ÈÍѲÄǽ¤Ç¤¢¤ê¡¢ ¤Þ¤¿¥¹¥¥ã¥ó¤ÎÅÓÃæ¤ÇÆþÎÏ¥Õ¥¡¥¤¥ë¤òÊѤ¨¤ë¤³¤È¤¬²Äǽ¤Ç¤¹¡£ °ú¿ô¤ò yyin ¤È¤·¤Æ¸Æ¤Ó½Ð¤¹¤³¤È¤Ë¤è¤ê¡¢¸½ºß¤ÎÆþÎϥХåե¡¤ò¼Î¤Æ¤ë¤³¤È¤â½ÐÍè¤Þ¤¹; ¤¿¤À¤·¡¢ YY_FLUSH_BUFFER (¾å½Ò)¤ò»ÈÍѤ¹¤ëÊý¤¬Îɤ¤¤Ç¤¹¡£ yyrestart() ¤Ï INITIAL ¤Î³«»Ï¾ò·ï¤òÊѹ¹¤· ¤Ê¤¤ ¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤ (¸å½Ò¤Î³«»Ï¾ò·ï»²¾È)¡£
¤¢¤ë¥¢¥¯¥·¥ç¥óÃæ¤Ç return ʸ¤ò¼Â¹Ô¤¹¤ë¤³¤È¤Ë¤è¤ê yylex() ¤¬¥¹¥¥ã¥ó¤ò»ß¤á¤¿¾ì¹ç¡¢¥¹¥¥ã¥Ê¤ÏºÆÅٸƤӽФ·²Äǽ¤Ç¤¢¤ê¡¢ ¤³¤Î¾ì¹ç¥¹¥¥ã¥ó¤Î»Ä¤ê¤ÎÉôʬ¤«¤éºÆ³«¤·¤Þ¤¹¡£
¥Ç¥Õ¥©¥ë¥È¤Ç(¸úΨ¤Î¤¿¤á)¡¢¥¹¥¥ã¥Ê¤Ïñ½ã¤Ê getc() ¥³¡¼¥ë¤Ç¤Ï¤Ê¤¯¥Ö¥í¥Ã¥¯¥ê¡¼¥É¤ò¹Ô¤¤¡¢ yyin ¤«¤éʸ»ú¤òÆɤߤޤ¹¡£ ÆþÎϼèÆÀÊýË¡¤Ï YY_INPUT ¥Þ¥¯¥í¤òÄêµÁ¤¹¤ë¤³¤È¤Ë¤è¤êÀ©¸æ¤Ç¤¤Þ¤¹¡£ YY_INPUT ¸Æ¤Ó½Ð¤·¼ê½ç¤Ï "YY_INPUT(buf,result,max_size)" ¤Ç¤¹¡£ ¤³¤Î¥¢¥¯¥·¥ç¥ó¤Ï¡¢ buf ʸ»úÇÛÎóÃæ¤ËºÇÂç max_size ʸ»ú¤òÍÑ°Õ¤·¡¢À°¿ôÊÑ¿ô result Ãæ¤ËÆɤ᤿ʸ»ú¿ô¤â¤·¤¯¤ÏÄê¿ô YY_NULL (Unix ¥·¥¹¥Æ¥à¤Ç¤Ï 0)¤òÆþ¤ì¤ÆÊÖ¤·¤Þ¤¹¡£ ¥Ç¥Õ¥©¥ë¥È¤Î YY_INPUT ¤Ï¥°¥í¡¼¥Ð¥ë¥Õ¥¡¥¤¥ë¥Ý¥¤¥ó¥¿ "yyin" ¤«¤éÆɤߤޤ¹¡£
YY_INPUT ¤Î¥µ¥ó¥×¥ëÄêµÁ¤Ç¤¹(ÆþÎÏ¥Õ¥¡¥¤¥ë¤ÎÄêµÁÉô¤Ë³ÊǼ):
%{
#define YY_INPUT(buf,result,max_size) \
{ \
int c = getchar(); \
result = (c == EOF) ? YY_NULL : (buf[0] = c, 1); \
}
%}
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flex ¤Ï¡¢¾ò·ïŪ¤Ë͸ú¤È¤Ê¤ë¥ë¡¼¥ë¤Î¤¿¤á¤Îµ¡¹½¤òÄ󶡤·¤Þ¤¹¡£ ¥Ñ¥¿¡¼¥ó¤Î¥×¥ì¥Õ¥£¥Ã¥¯¥¹¤¬ "<sc>" ¤È¤Ê¤Ã¤Æ¤¤¤ë¥ë¡¼¥ë¤Ï¡¢ ¥¹¥¥ã¥Ê¤¬ "sc" ¤È¤¤¤¦Ì¾Á°¤Î³«»Ï¾ò·ï¤Ë¤¤¤ë¾ì¹ç¤Î¤ß͸ú¤Ç¤¹¡£ Î㤨¤Ð¡¢
<STRING>[^"]* { /* eat up the string body ... */
...
}
¤Ï¥¹¥¥ã¥Ê¤¬ "STRING" ³«»Ï¾ò·ï¤Ë¤¤¤ë»þ¤Î¤ß͸ú¤Ç¤¢¤ê¡¢
<INITIAL,STRING,QUOTE>\. { /* handle an escape ... */
...
}
¤Ï¸½ºß¤Î³«»Ï¾ò·ï¤¬¡¢ "INITIAL", "STRING", "QUOTE" ¤Î¤¤¤º¤ì¤«¤Î¾ì¹ç¤Î¤ß͸ú¤Ç¤¹¡£ ³«»Ï¾ò·ï¤Ï¡¢ÆþÎϤÎÄêµÁ(ÀèƬ)Éô¤Ë¤ª¤¤¤Æ¡¢¥¤¥ó¥Ç¥ó¥È¤µ¤ì¤Ê¤¤¹Ô¤Ç %s ¤â¤·¤¯¤Ï %x ¤«¤é»Ï¤Þ¤ê̾Á°¤¬Â³¤¯¹Ô¤Ë¤ª¤¤¤ÆÀë¸À¤µ¤ì¤Þ¤¹¡£ Á°¼Ô¤Ï ÆâÊñŪ ³«»Ï¾ò·ï¤ò¡¢ ¸å¼Ô¤Ï ÇÓ¾Ū ³«»Ï¾ò·ï¤ò¡¢¤½¤ì¤¾¤ìÀë¸À¤·¤Þ¤¹¡£ ³«»Ï¾ò·ï¤ò͸ú¤Ë¤¹¤ë¤Î¤Ï BEGIN ¥¢¥¯¥·¥ç¥ó¤Ç¤¹¡£ ¼¡¤Î BEGIN ¥¢¥¯¥·¥ç¥ó¤¬¼Â¹Ô¤µ¤ì¤ë¤Þ¤Ç¡¢Í¿¤¨¤é¤ì¤¿³«»Ï¾ò·ï¤Î¥ë¡¼¥ë¤Ï͸ú¤Ç¤¢¤ê¡¢ ¾¤Î³«»Ï¾ò·ï¤Î¥ë¡¼¥ë¤Ï̵¸ú¤Ç¤¹¡£ ³«»Ï¾ò·ï¤¬ ÆâÊñŪ ¤Ê¾ì¹ç¡¢³«»Ï¾ò·ï¤ò»ý¤¿¤Ê¤¤¥ë¡¼¥ë¤â¤Þ¤¿Í¸ú¤Ç¤¹¡£ ³«»Ï¾ò·ï¤¬ ÇÓ¾Ū ¤Ê¾ì¹ç¡¢ ³«»Ï¾ò·ï¤òËþ¤¿¤¹¥ë¡¼¥ë ¤À¤± ¤¬Í¸ú¤Ç¤¹¡£ Ʊ¤¸ÇÓ¾³«»Ï¾ò·ï¤Ë°Í¸¤¹¤ë¥ë¡¼¥ë¤ÎÁȤϡ¢ flex ÆþÎÏÃæ¤ÎÊ̤Υ롼¥ë¤È¤ÏÆÈΩ¤Ê¥¹¥¥ã¥Ê¤òµ½Ò¤·¤Þ¤¹¡£ ¤½¤Î¤¿¤á¡¢ÇÓ¾³«»Ï¾ò·ï¤ò»ÈÍѤ¹¤ì¤Ð¡¢"¥ß¥Ë¥¹¥¥ã¥Ê" (ÊÌÉôʬ¤È¤ÏʸˡŪ¤Ë°Û¤Ê¤ëÉôʬ(Î㤨¤Ð¥³¥á¥ó¥È)¤ËÂФ¹¤ë¥¹¥¥ã¥Ê) ¤ò´Êñ¤Ë»ØÄê¤Ç¤¤Þ¤¹¡£
ÆâÊñŪ³«»Ï¾ò·ï¤ÈÇÓ¾Ū³«»Ï¾ò·ï¤È¤¬¤Þ¤À¾¯¤·Û£Ëæ¤Ç¤¢¤ë¤Ê¤é¡¢ ξ¼Ô¤Î´Ø·¸¤òɽ¤¹Îã¤ò¼¨¤·¤ÆÀâÌÀ¤·¤Þ¤¹¡£°Ê²¼¤Î¥ë¡¼¥ë¤ÎÁÈ:
%s example
%%
<example>foo do_something();
bar something_else();
¤Ï
%x example
%%
<example>foo do_something();
<INITIAL,example>bar something_else();
¤ÈÅù²Á¤Ç¤¹¡£ <INITIAL,example> ¤¬Ìµ¤¤¤È¡¢2 ÈÖÌܤÎÎã¤Ë¤ª¤±¤ë bar ¥Ñ¥¿¡¼¥ó¤Ï¡¢³«»Ï¾ò·ï¤¬ example ¤Î¾ì¹ç¡¢Í¸ú¤È¤Ê¤ê¤Þ¤»¤ó(¤¹¤Ê¤ï¤Á¥Þ¥Ã¥Á¤·¤Þ¤»¤ó)¡£ <example> ¤À¤±¤ò bar ¤Ë¤Ä¤±¤ë¤È¡¢ example ¤À¤±¤Ë¤ª¤¤¤Æ͸ú¤È¤Ê¤ê¡¢ INITIAL ¤Ç¤Ï͸ú¤È¤Ê¤ê¤Þ¤»¤ó¡£°ìÊý¡¢ºÇ½é¤ÎÎã¤Ç¤Ï¤É¤Á¤é¤Î¾ì¹ç¤Ç¤â͸ú¤Ç¤¹¡£ ¤Ê¤¼¤Ê¤éºÇ½é¤ÎÎã¤Ç¤Ï example ³«»Ï¾ò·ï¤Ï ÆâÊñŪ (%s) ³«»Ï¾ò·ï¤À¤«¤é¤Ç¤¹¡£ Æüì¤Ê³«»Ï¾ò·ï»ØÄê»Ò <*> ¤ÏÁ´¤Æ¤Î³«»Ï¾ò·ï¤Ë¥Þ¥Ã¥Á¤¹¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£ ¤³¤Î¤¿¤á¡¢¾å¤ÎÎã¤Ï¼¡¤Î¤è¤¦¤Ë¤â½ñ¤±¤Þ¤¹;
%x example
%%
<example>foo do_something();
<*>bar something_else();
¥Ç¥Õ¥©¥ë¥È¥ë¡¼¥ë(¥Þ¥Ã¥Á¤·¤Ê¤«¤Ã¤¿Ê¸»ú¤ËÂФ·¤Æ¤Ï ECHO ¤Ç¤¹)¤Ï³«»Ï¾ò·ïÃæ¤Ç¤â͸ú¤Ç¤¹¡£ ¤³¤ì¤Ï¼¡¤Î¤â¤Î¤ÈÅù²Á¤Ç¤¹:
<*>.|\n ECHO;
BEGIN(0) ¤Ï¡¢³«»Ï¾ò·ï¤Î̵¤¤¥ë¡¼¥ë¤À¤±¤¬Í¸ú¤Ç¤¢¤ë¡¢ºÇ½é¤Î¾õÂÖ¤ËÌá¤ê¤Þ¤¹¡£ ¤³¤Î¾õÂ֤ϳ«»Ï¾ò·ï "INITIAL" ¤È¤·¤Æ»²¾È¤Ç¤¤ë¤¿¤á¡¢ BEGIN(INITIAL) ¤Ï BEGIN(0) ¤ÈÅù²Á¤Ç¤¹¡£ (³«»Ï¾ò·ï̾¤ò³ç¤ë³ç¸Ì¤ÏÉÔÍפǤ¹¤¬¡¢Îɤ¤¥¹¥¿¥¤¥ë¤Ç¤¢¤ë¤È¤µ¤ì¤Æ¤¤¤Þ¤¹¡£)
BEGIN ¥¢¥¯¥·¥ç¥ó¤Ï¡¢¥ë¡¼¥ëÉô¤ÎÀèƬ¤Î¥¤¥ó¥Ç¥ó¥È¤µ¤ì¤¿¥³¡¼¥ÉÃæ¤Ë¸½¤ì¤Æ¤âÎɤ¤¤Ç¤¹¡£ Î㤨¤Ð°Ê²¼¤ÎÎã¤Ç¤Ï¡¢ yylex() ¤¬¸Æ¤Ð¤ì¥°¥í¡¼¥Ð¥ëÊÑ¿ô enter_special ¤¬¿¿¤Î¾ì¹ç¤Ë¤Ï¡¢¥¹¥¥ã¥Ê¤Ï "SPECIAL" ³«»Ï¾ò·ï¤ËÆþ¤ê¤Þ¤¹:
int enter_special;
%x SPECIAL
%%
if ( enter_special )
BEGIN(SPECIAL);
<SPECIAL>blahblahblah
...more rules follow...
³«»Ï¾ò·ï¤òÀâÌÀ¤¹¤ë¤¿¤á¤Ë¡¢ "123.456" ¤Î¤è¤¦¤Êʸ»úÎó¤ò 2 Ä̤ê¤Î°Û¤Ê¤Ã¤¿²ò¼á¤ò¤¹¤ë¥¹¥¥ã¥Ê¤ò¼¨¤·¤Þ¤¹¡£ ¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¤³¤ì¤Ï¡¢ À°¿ô "123" ¤È¥É¥Ã¥È ('.') ¤ÈÀ°¿ô "456" ¤Î 3 ¥È¡¼¥¯¥ó¤Ë¿ô¤¨¤é¤ì¤Þ¤¹¡£ ¤·¤«¤·¡¢¤³¤Îʸ»úÎó¤ÎÁ°¤Ë "expect-floats" ¤Îʸ»úÎ󤬤¢¤ë¾ì¹ç¡¢ ¤³¤ì¤Ïñ°ì¤Î¥È¡¼¥¯¥ó¤Ç¤¢¤ë¤È¤µ¤ì¡¢ÉâÆ°¾®¿ôÅÀ¿ô 123.456 ¤È¤µ¤ì¤Þ¤¹:
%{
#include <math.h>
%}
%s expect
%%
expect-floats BEGIN(expect);
<expect>[0-9]+"."[0-9]+ {
printf( "found a float, = %f\n",
atof( yytext ) );
}
<expect>\n {
/* that's the end of the line, so
* we need another "expect-number"
* before we'll recognize any more
* numbers
*/
BEGIN(INITIAL);
}
[0-9]+ {
printf( "found an integer, = %d\n",
atoi( yytext ) );
}
"." printf( "found a dot\n" );
¼¡¤Ï¡¢C ¤Î¥³¥á¥ó¥È¤òÍý²ò(¤·¤Æ¼Î¤Æ¤ë)°ìÊý¤Ç¡¢ ¸½ºß¤ÎÆþÎϹԤò¿ô¤¨¤ë¥¹¥¥ã¥Ê¤Ç¤¹¡£
%x comment
%%
int line_num = 1;
"/*" BEGIN(comment);
<comment>[^*\n]* /* eat anything that's not a '*' */
<comment>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */
<comment>\n ++line_num;
<comment>"*"+"/" BEGIN(INITIAL);
¤³¤Î¥¹¥¥ã¥Ê¤Ï³Æ¥ë¡¼¥ë¤Ç²Äǽ¤ÊºÇÂç¤Î¥Æ¥¥¹¥È¤Ë¥Þ¥Ã¥Á¤·¤è¤¦¤È¤¹¤ë¾ì¹ç¡¢ ¤Á¤ç¤Ã¤È¤·¤¿ÌäÂ꤬µ¯¤³¤ê¤Þ¤¹¡£ °ìÈÌŪ¤Ë¤Ï¡¢¹â®¤Ê¥¹¥¥ã¥Ê¤òµ½Ò¤¹¤ë¾ì¹ç¡¢ ³Æ¥ë¡¼¥ë¤ÇºÇÂç¤Î¥Þ¥Ã¥Á¤òÆÀ¤è¤¦¤È¤¹¤ë¤³¤È¤¬ºÇ¤âÀ®¸ù¤·¤Þ¤¹¡£ ³«»Ï¾ò·ï̾¤Ï¼ÂºÝ¤Ë¤ÏÀ°¿ôÃͤǤ¢¤ê¡¢³ÊǼ¤¹¤ë¤³¤È¤¬½ÐÍè¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£ ¤½¤Î¤¿¤á¡¢¾åµÎã¤Ï°Ê²¼¤Î¤è¤¦¤Ë³ÈÄ¥¤Ç¤¤Þ¤¹:
%x comment foo
%%
int line_num = 1;
int comment_caller;
"/*" {
comment_caller = INITIAL;
BEGIN(comment);
}
...
<foo>"/*" {
comment_caller = foo;
BEGIN(comment);
}
<comment>[^*\n]* /* eat anything that's not a '*' */
<comment>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */
<comment>\n ++line_num;
<comment>"*"+"/" BEGIN(comment_caller);
¤µ¤é¤Ë¡¢¸½ºß¤Î³«»Ï¾ò·ï¤òÀ°¿ôÃͤǤ¢¤ë¥Þ¥¯¥í YY_START ¤Ë¤Æ¥¢¥¯¥»¥¹¤Ç¤¤Þ¤¹¡£ Î㤨¤Ð¡¢¾åµ¤Î comment_caller ¤Ø¤ÎÂåÆþ¤Ï¼¡¤Î¤è¤¦¤Ëµ½Ò¤Ç¤¤Þ¤¹¡£
comment_caller = YY_START;
flex ¤Ï YYSTATE ¤ò YY_START ¤Î¥¨¥¤¥ê¥¢¥¹¤È¤·¤ÆÄ󶡤·¤Þ¤¹ (AT&T ¤Î lex ¤¬»ÈÍѤ·¤Æ¤¤¤Þ¤¹)¡£ ³«»Ï¾ò·ï¤ÏÆȼ«¤Î̾Á°¶õ´Ö¤ò»ý¤¿¤Ê¤¤¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤; %s ¤ä %x ¤ÎÀë¸À¤Ë¤ª¤±¤ë̾Á°Àë¸À¤Î°·¤¤¤Ï #define ¤ÈƱ¤¸¤Ç¤¹¡£
ºÇ¸å¤Ë¡¢ÇÓ¾Ū³«»Ï¾ò·ï¤ò»ÈÍѤ¹¤ë¡¢ Ÿ³«¤µ¤ì¤¿¥¨¥¹¥±¡¼¥×¥·¡¼¥±¥ó¥¹¤ò´Þ¤à(Ť¹¤®¤ëʸ»úÎó¤Î¥Á¥§¥Ã¥¯¤Ï´Þ¤ß¤Þ¤»¤ó) C ¥¹¥¿¥¤¥ë¤Î¥¯¥ª¡¼¥Èʸ»úÎó¤Ø¤Î¥Þ¥Ã¥ÁÊýË¡¤ò¼¨¤·¤Þ¤¹:
%x str
%%
char string_buf[MAX_STR_CONST];
char *string_buf_ptr;
\" string_buf_ptr = string_buf; BEGIN(str);
<str>\" { /* saw closing quote - all done */
BEGIN(INITIAL);
*string_buf_ptr = '\0';
/* return string constant token type and
* value to parser
*/
}
<str>\n {
/* error - unterminated string constant */
/* generate error message */
}
<str>\\[0-7]{1,3} {
/* octal escape sequence */
int result;
(void) sscanf( yytext + 1, "%o", &result );
if ( result > 0xff )
/* error, constant is out-of-bounds */
*string_buf_ptr++ = result;
}
<str>\\[0-9]+ {
/* generate error - bad escape sequence; something
* like '\48' or '\0777777'
*/
}
<str>\\n *string_buf_ptr++ = '\n';
<str>\\t *string_buf_ptr++ = '\t';
<str>\\r *string_buf_ptr++ = '\r';
<str>\\b *string_buf_ptr++ = '\b';
<str>\\f *string_buf_ptr++ = '\f';
<str>\\(.|\n) *string_buf_ptr++ = yytext[1];
<str>[^\\\n\"]+ {
char *yptr = yytext;
while ( *yptr )
*string_buf_ptr++ = *yptr++;
}
¾åµÎã¤Î¤è¤¦¤ËƱ°ì¤Î³«»Ï¾ò·ï¤ò»ý¤ÄÁ´¤Æ¤Î¥ë¡¼¥ë¤ÎÁ°¤Ë ³«»Ï¾ò·ï¤ò½ñ¤«¤Í¤Ð¤Ê¤é¤Ê¤¤¤³¤È¤¬Â¿¤¤¤Ç¤¹¡£ flex ¤Ï¤³¤ì¤ò´Êñ¤«¤ÄåºÎï¤Ë¤¹¤ë¤¿¤á³«»Ï¾ò·ï ¥¹¥³¡¼¥× ¤òƳÆþ¤·¤Þ¤·¤¿¡£ ³«»Ï¾ò·ï¥¹¥³¡¼¥×¤Ï¼¡¤Î¤è¤¦¤Ë»Ï¤Þ¤ê¤Þ¤¹:
<SCs>{
¤³¤³¤Ç SCs ¤Ï 1 ¤Ä°Ê¾å¤Î³«»Ï¾ò·ï¤Î¥ê¥¹¥È¤Ç¤¹¡£ ³«»Ï¾ò·ï¥¹¥³¡¼¥×Æâ¤Ç¤Ï¡¢ ºÇ½é¤Î '{' ¤Ë¥Þ¥Ã¥Á¤¹¤ë¤Þ¤Ç¤Î '}' ¤Ë¤ª¤¤¤Æ¡¢Á´¤Æ¤Î¥ë¡¼¥ë¤Ï¼«Æ°Åª¤Ë <SCs> ¤Î¥×¥ì¥Õ¥£¥Ã¥¯¥¹¤¬ÉÕ¤¤Þ¤¹¡£ ¤½¤Î¤¿¤á¡¢Î㤨¤Ð
<ESC>{
"\\n" return '\n';
"\\r" return '\r';
"\\f" return '\f';
"\\0" return '\0';
}
¤Ï¼¡¤Î¤â¤Î¤ÈÅù²Á¤Ç¤¹:
<ESC>"\\n" return '\n';
<ESC>"\\r" return '\r';
<ESC>"\\f" return '\f';
<ESC>"\\0" return '\0';
³«»Ï¾ò·ï¥¹¥³¡¼¥×¤Ï¥Í¥¹¥È¤¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹¡£ ³«»Ï¾ò·ï¤Î¥¹¥¿¥Ã¥¯¤òÀ©¸æ¤¹¤ë¤¿¤á¤Ë 3 ¤Ä¤Î¥ë¡¼¥Á¥ó¤ò»ÈÍѲÄǽ¤Ç¤¹:
- void yy_push_state(int new_state)
- ¸½ºß¤Î³«»Ï¾ò·ï¤ò³«»Ï¾ò·ï¥¹¥¿¥Ã¥¯¤ÎÀèƬ¤Ë¥×¥Ã¥·¥å¤·¡¢ BEGIN new_state ¤ò»ÈÍѤ·¤¿¤«¤Î¤è¤¦¤Ë new_state ¤ËÀÚ¤êÂؤ¨¤Þ¤¹ (³«»Ï¾ò·ï̾¤ÏÀ°¿ôÃͤǤ⤢¤ë¤³¤È¤ò»×¤¤½Ð¤·¤Æ²¼¤µ¤¤)¡£
- void yy_pop_state()
- ¥¹¥¿¥Ã¥¯¤ÎÀèƬ¤ò¥Ý¥Ã¥×¤·¡¢ BEGIN ¤ò»ÈÍѤ·¤Æ¤½¤Î³«»Ï¾ò·ï¤ËÀÚ¤êÂؤ¨¤Þ¤¹¡£
- int yy_top_state()
- ¥¹¥¿¥Ã¥¯¤ÎÆâÍƤòÊѹ¹¤»¤º¤Ë¡¢¥¹¥¿¥Ã¥¯¤ÎÀèƬ¤òÊÖ¤·¤Þ¤¹¡£
³«»Ï¾ò·ï¥¹¥¿¥Ã¥¯¤ÏưŪ¤ËÂ礤¯¤Ê¤ê¡¢ ¤Þ¤¿ÁȤ߹þ¤ß»þ¤Î¥µ¥¤¥ºÀ©¸Â¤Ï¤¢¤ê¤Þ¤»¤ó¡£ ¥á¥â¥ê¤ò»È¤¤ÀÚ¤ë¤È¡¢¥×¥í¥°¥é¥à¼Â¹Ô¤ÏÃæ»ß¤µ¤ì¤Þ¤¹¡£
³«»Ï¾ò·ï¥¹¥¿¥Ã¥¯¤ò»ÈÍѤ¹¤ë¤¿¤á¤Ë¤Ï¡¢¥¹¥¥ã¥Ê¤Ï %option stack ¥Ç¥£¥ì¥¯¥Æ¥£¥Ö¤ò¥¤¥ó¥¯¥ë¡¼¥É¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹ (²¼µ¥ª¥×¥·¥ç¥ó¤ò»²¾È¤·¤Æ²¼¤µ¤¤)¡£
Ê£¿ô¤ÎÆþÎϥХåե¡
¥¹¥¥ã¥Ê¤Ë¤è¤Ã¤Æ¤Ï(¥Õ¥¡¥¤¥ë¤Î "include" ¤ò¥µ¥Ý¡¼¥È¤¹¤ëÅù) Ê£¿ô¤ÎÆþÎÏ¥¹¥È¥ê¡¼¥à¤ò°·¤¦É¬Íפ¬¤¢¤ê¤Þ¤¹¡£ flex ¥¹¥¥ã¥Ê¤Ç¤ÏÂ礤ʥХåե¡¥ê¥ó¥°¤ò¹Ô¤¦¤¿¤á¡¢ ¥¹¥¥ã¥ó¥³¥ó¥Æ¥¥¹¥È¤Ë±Æ¶Á¤µ¤ì¤ë YY_INPUT ¤òñ½ã¤Ë½ñ¤´¹¤¨¤ë¤À¤±¤Ç¤Ï¼¡¤ÎÆþÎϤ¬¤É¤³¤«¤éÆɤޤì¤ë¤Î¤«¤òÀ©¸æ¤Ç¤¤Þ¤»¤ó¡£ YY_INPUT ¤¬¸Æ¤Ð¤ì¤ë¤Î¤Ï¥¹¥¥ã¥Ê¤¬¥Ð¥Ã¥Õ¥¡¤Î½ª¤ê¤ËÅþ㤹¤ë»þ¤À¤±¤Ç¤¹¤Î¤Ç¡¢ Î㤨¤Ð "include" ¤Î¤è¤¦¤ËÆþÎϸµ¤òÀÚ¤êÂؤ¨¤ëɬÍפΤ¢¤ëʸ¤ò¥¹¥¥ã¥ó¤·¤¿¸å¤Ç¤â Ĺ»þ´Ö¤òÈñ¤¹¾ì¹ç¤¬¤¢¤ê¤Þ¤¹¡£¤³¤ÎÍͤÊÌäÂê¤ò²ò·è¤¹¤ë¤¿¤á¡¢ flex ¤ÏÊ£¿ô¤ÎÆþÎϥХåե¡¤òÀ¸À®¤·¤ÆÀÚ¤êÂؤ¨¤ëµ¡¹½¤òÄ󶡤·¤Þ¤¹¡£ ÆþÎϥХåե¡¤Ï¼¡¤Î¤è¤¦¤ËÀ¸À®¤µ¤ì¤Þ¤¹:
YY_BUFFER_STATE yy_create_buffer( FILE *file, int size )
¤³¤ì¤Ï FILE ¥Ý¥¤¥ó¥¿¤È size ¤ò¼è¤ê¡¢Í¿¤¨¤é¤ì¤ë file ¤Ë´ØÏ¢¤· size ʸ»ú¤òÊÝ»ý¤¹¤ë¤Ë½½Ê¬¤Ê¥Ð¥Ã¥Õ¥¡¤òÀ¸À®¤·¤Þ¤¹ (µ¿¤ï¤·¤¤¾ì¹ç¤Ë¤Ï size ¤Ë¤Ï YY_BUF_SIZE ¤ò»ÈÍѤ·¤Æ²¼¤µ¤¤)¡£ ¤³¤ì¤Ï¡¢Ê̤Υ롼¥Á¥ó(²¼µ»²¾È)¤ËÅϤ¹¤¿¤á¤Î YY_BUFFER_STATE ¥Ï¥ó¥É¥ë¤òÊÖ¤·¤Þ¤¹¡£ YY_BUFFER_STATE ¤Î¥¿¥¤¥×¤Ï struct yy_buffer_state ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¤¿¤á¡¢ °ÂÁ´¤Î¤¿¤á YY_BUFFER_STATE ÊÑ¿ô¤ò ((YY_BUFFER_STATE) 0) ¤È½é´ü²½¤¹¤ë¤³¤È¤¬½ÐÍè¡¢ ¥¹¥¥ã¥Ê¤Ç¤Ï¤Ê¤¯¥½¡¼¥¹¥Õ¥¡¥¤¥ë¤Ë¤ª¤¤¤Æ ÆþÎϥХåե¡¤òÀµ¤·¤¯Àë¸À¤¹¤ë¤¿¤á¤Ë¤³¤Î¹½Â¤ÂΤò»²¾È¤¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹¡£ yy_create_buffer ¸Æ¤Ó½Ð¤·¤Ë¤ª¤±¤ë FILE ¥Ý¥¤¥ó¥¿¤Ï YY_INPUT ¤«¤é¸«¤¨¤ë yyin ¤ÎÃͤÈƱ¤¸¤è¤¦¤Ë¤À¤±»ÈÍѤµ¤ì¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤; YY_INPUT ¤òºÆÄêµÁ¤·¤Æ yyin ¤ò»È¤ï¤Ê¤¤¤è¤¦¤Ë¤¹¤ë¤³¤È¤Ë¤è¤ê¡¢ yy_create_buffer ¤ËÂФ·¤Æ°ÂÁ´¤Ë¥Ë¥ë FILE ¥Ý¥¤¥ó¥¿¤òÅϤ»¤Þ¤¹¡£ ¥¹¥¥ã¥ó¤¹¤ë¥Ð¥Ã¥Õ¥¡¤òÁªÂò¤¹¤ë¤¿¤á¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Þ¤¹:
void yy_switch_to_buffer( YY_BUFFER_STATE new_buffer )
¤³¤ì¤Ï¥¹¥¥ã¥Ê¤ÎÆþÎϥХåե¡¤òÀÚ¤êÂؤ¨¡¢ ¥È¡¼¥¯¥ó¤¬ new_buffer ¤«¤éÍè¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£ ¿·¤¿¤Ê¥Õ¥¡¥¤¥ë¤ò¥ª¡¼¥×¥ó¤·¤Æ yyin ¤ò»Ø¤¹¤Î¤Ç¤Ï¤Ê¤¯¡¢¥¹¥¥ã¥ó¤ò·Ñ³¤¹¤ë¤¿¤á¤Ë yywrap() ¤«¤é yy_switch_to_buffer() ¤ò»ÈÍѤ¹¤ë¤³¤È¤¬¤¢¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£ ¤Þ¤¿¡¢ yy_switch_to_buffer() ¤Þ¤¿¤Ï yywrap() ¤Ë¤è¤ëÆþÎϸµ¤ÎÀÚ¤êÂؤ¨¤Ï³«»Ï¾ò·ï¤òÊѹ¹¤· ¤Ê¤¤ ¤³¤È¤Ë¤âÃí°Õ¤·¤Æ²¼¤µ¤¤¡£
void yy_delete_buffer( YY_BUFFER_STATE buffer )
¤Ï¥Ð¥Ã¥Õ¥¡¤Ë´ØÏ¢¤Å¤±¤é¤ì¤¿¥¹¥È¥ì¡¼¥¸¤ÎÊÖ´ÔÍ×µá¤Ë»ÈÍѤ·¤Þ¤¹¡£( buffer ¤Ï¥Ë¥ë¤Ç¤â¹½¤¤¤Þ¤»¤ó¤¬¤³¤Î¾ì¹ç¤³¤Î¥ë¡¼¥Á¥ó¤Ï²¿¤â¤·¤Þ¤»¤ó¡£) ¸½ºß¤Î¥Ð¥Ã¥Õ¥¡¤ÎÆâÍƤò¥¯¥ê¥¢¤¹¤ë¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Þ¤¹:
void yy_flush_buffer( YY_BUFFER_STATE buffer )
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ºÇ¸å¤Ë YY_CURRENT_BUFFER ¥Þ¥¯¥í¤Ï¡¢¸½ºß¤Î¥Ð¥Ã¥Õ¥¡¤ËÂФ¹¤ë YY_BUFFER_STATE ¥Ï¥ó¥É¥ë¤òÊÖ¤·¤Þ¤¹¡£
¤³¤Îµ¡Ç½¤ò»ÈÍѤ·¤Æ¥¤¥ó¥¯¥ë¡¼¥É¥Õ¥¡¥¤¥ë¤òŸ³«¤¹¤ë¥¹¥¥ã¥Ê¤Îµ½ÒÎã¤Ç¤¹( <<EOF>> µ¡Ç½¤Ï¸å½Ò¤·¤Þ¤¹):
/* the "incl" state is used for picking up the name
* of an include file
*/
%x incl
%{
#define MAX_INCLUDE_DEPTH 10
YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr = 0;
%}
%%
include BEGIN(incl);
[a-z]+ ECHO;
[^a-z\n]*\n? ECHO;
<incl>[ \t]* /* eat the whitespace */
<incl>[^ \t\n]+ { /* got the include file name */
if ( include_stack_ptr >= MAX_INCLUDE_DEPTH )
{
fprintf( stderr, "Includes nested too deeply" );
exit( 1 );
}
include_stack[include_stack_ptr++] =
YY_CURRENT_BUFFER;
yyin = fopen( yytext, "r" );
if ( ! yyin )
error( ... );
yy_switch_to_buffer(
yy_create_buffer( yyin, YY_BUF_SIZE ) );
BEGIN(INITIAL);
}
<<EOF>> {
if ( --include_stack_ptr < 0 )
{
yyterminate();
}
else
{
yy_delete_buffer( YY_CURRENT_BUFFER );
yy_switch_to_buffer(
include_stack[include_stack_ptr] );
}
}
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- NUL ¥¿¡¼¥ß¥Í¡¼¥È¤µ¤ì¤¿Ê¸»úÎó¤ò¥¹¥¥ã¥ó¤·¤Þ¤¹¡£
- yy_scan_bytes(const char *bytes, int len)
- len ¥Ð¥¤¥È (NUL ¤¬´Þ¤Þ¤ì¤ë¤«¤âÃΤì¤Þ¤»¤ó)¤ò°ÌÃÖ bytes ¤«¤é¥¹¥¥ã¥ó¤·¤Þ¤¹¡£
¤É¤Á¤é¤Î´Ø¿ô¤âʸ»úÎó¤â¤·¤¯¤Ï¥Ð¥¤¥ÈÎó¤Î ¥³¥Ô¡¼ ¤òÀ¸À®¤·¤Æ¤«¤é¥¹¥¥ã¥ó¤·¤Þ¤¹¡£( yylex() ¤Ï¥¹¥¥ã¥ó¤¹¤ë¥Ð¥Ã¥Õ¥¡¤ÎÆâÍƤòÊѹ¹¤¹¤ë¤¿¤á¡¢¤³¤ì¤¬Ë¾¤Þ¤·¤¤¤Î¤Ç¤¹¡£) ¥³¥Ô¡¼¤òÈò¤±¤ë¤¿¤á¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Þ¤¹:
- yy_scan_buffer(char *base, yy_size_t size)
- ¥Ð¥Ã¥Õ¥¡Æâ¤Ç base ¤«¤é size ¥Ð¥¤¥È¤ÎŤµ¤ò¥¹¥¥ã¥ó¤·¤Þ¤¹¡£ºÇ¸å¤Î 2 ¥Ð¥¤¥È¤Ï YY_END_OF_BUFFER_CHAR (ASCII NUL) ¤Ç¤¢¤ë ɬÍפ¬¤¢¤ê¤Þ¤¹¡£ ¤³¤ì¤é¤ÎºÇ¸å¤Î 2 ¥Ð¥¤¥È¤Ï¥¹¥¥ã¥ó¤µ¤ì¤Þ¤»¤ó; ¤½¤Î¤¿¤á¥¹¥¥ã¥ó¤ÎÆâÍÆ¤Ï base[0] ¤«¤é base[size-2] ¤Þ¤Ç¤Çξü¤ò´Þ¤ß¤Þ¤¹¡£
- ¤³¤ÎÍͤˤʤë¤è¤¦¤Ë base ¤òÀßÄꤷ¤Ê¤«¤Ã¤¿¾ì¹ç(¤Ä¤Þ¤êºÇ¸å¤Î 2 ¤Ä¤Î YY_END_OF_BUFFER_CHAR ¥Ð¥¤¥È¤ò˺¤ì¤¿¾ì¹ç)¡¢ yy_scan_buffer() ¤Ï¿·¤·¤¤¥Ð¥Ã¥Õ¥¡¤òÀ¸À®¤¹¤ë¤Î¤Ç¤Ï¤Ê¤¯¥Ë¥ë¥Ý¥¤¥ó¥¿¤òÊÖ¤·¤Þ¤¹¡£
- ·¿ yy_size_t ¤ÏÀ°¿ô·¿¤Ç¤¢¤ê¡¢ ¥Ð¥Ã¥Õ¥¡¤ÎÂ礤µ¤òÈ¿±Ç¤¹¤ëÀ°¿ô¼°¤ò¤³¤Î·¿¤Ë¥¥ã¥¹¥È¤¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹¡£
¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤Î¥ë¡¼¥ë
ÆÃÊ̥롼¥ë "<<EOF>>" ¤Ï¡¢ ¥Õ¥¡¥¤¥ë¤Î½ªÎ»»þ¤â¤·¤¯¤Ï yywrap() ¤¬Èó¥¼¥í(¤¹¤Ê¤ï¤Á½èÍý¤¹¤ë¥Õ¥¡¥¤¥ë¤¬Ìµ¤¤¤³¤È¤òɽ¤¹)¤Î»þ¤Ë ¹Ô¤ï¤ì¤ë¤Ù¤¥¢¥¯¥·¥ç¥ó¤òɽ¤·¤Þ¤¹¡£ ¥¢¥¯¥·¥ç¥ó¤Ï°Ê²¼¤Î 4 ¤Ä¤Î¤¦¤Á¤Î¤¤¤º¤ì¤«¤Ç½ª¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£- -
- yyin ¤Ë¿·¤·¤¤¥Õ¥¡¥¤¥ë¤ò³ä¤êÅö¤Æ¤ë(Á°¤Î¥Ð¡¼¥¸¥ç¥ó¤Î flex ¤Ç¤Ï¡¢ ³ä¤êÅö¤Æ¸å¤ËÆÃÊ̤ʥ¢¥¯¥·¥ç¥ó YY_NEW_FILE ¤ò¸Æ¤Ó½Ð¤¹É¬Íפ¬¤¢¤ê¤Þ¤·¤¿; º£¤Ç¤ÏÉÔÍפǤ¹¡£);
- -
- return ʸ¤ò¼Â¹Ô¤¹¤ë;
- -
- ÆÃÊÌ¤Ê yyterminate() ¥¢¥¯¥·¥ç¥ó¤ò¼Â¹Ô¤¹¤ë;
- -
- yy_switch_to_buffer() ¤ò»ÈÍѤ·¤Æ¿·¤¿¤Ê¥Ð¥Ã¥Õ¥¡¤ËÀÚ¤êÂؤ¨¤ë (¾åµÎã¤Ç¼¨¤·¤¿Ä̤ê)¡£
<<EOF>> ¥ë¡¼¥ë¤ò¾¤Î¥Ñ¥¿¡¼¥ó¤È¶¦¤Ë»ÈÍѤ·¤Æ¤Ï¤Ê¤ê¤Þ¤»¤ó; ¾¤Î¥Ñ¥¿¡¼¥ó¤Ï³«»Ï¾ò·ï¤Î¥ê¥¹¥È¤È¤â¤Ë¤À¤±Ëþ¤¿¤µ¤ì¤ë¤«¤é¤Ç¤¹¡£ Ëþ¤¿¤µ¤ì¤Ê¤¤ <<EOF>> ¥ë¡¼¥ë¤¬Í¿¤¨¤é¤ì¤¿¾ì¹ç¡¢ <<EOF>> ¥¢¥¯¥·¥ç¥ó¤ò¤Þ¤À»ý¤Ã¤Æ¤¤¤Ê¤¤ Á´¤Æ¤Î ³«»Ï¾ò·ï¤ËŬÍѤµ¤ì¤Þ¤¹¡£ <<EOF>> ¥ë¡¼¥ë¤òºÇ½é¤Î³«»Ï¾ò·ï¤À¤±¤Ë»ØÄꤹ¤ë¤¿¤á¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Æ²¼¤µ¤¤¡£
<INITIAL><<EOF>>
¤³¤ì¤é¤Î¥ë¡¼¥ë¤ÏÊĤ¸¤Æ¤¤¤Ê¤¤¥³¥á¥ó¥È¤òÊá¤Þ¤¨¤ë¾ì¹çÅù¤ËÊØÍø¤Ç¤¹¡£ Î㤨¤Ð:
%x quote
%%
...other rules for dealing with quotes...
<quote><<EOF>> {
error( "unterminated quote" );
yyterminate();
}
<<EOF>> {
if ( *++filelist )
yyin = fopen( *filelist, "r" );
else
yyterminate();
}
»¨Â¿¤Ê¥Þ¥¯¥í
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#define YY_USER_ACTION ++ctr[yy_act]
¤³¤³¤Ç ctr ¤ÏÇÛÎó¤Ç¤¢¤ê¡¢¤½¤ì¤¾¤ì¤Î¥ë¡¼¥ë¤¬¥Þ¥Ã¥Á¤·¤¿²ó¿ô¤ò·×¿ô¤·¤Þ¤¹¡£ ¥Þ¥¯¥í YY_NUM_RULES ¤Ï¥ë¡¼¥ë¤ÎÁí¿ô¤òɽ¤¹¤¿¤á( -s ¤ò»È¤Ã¤¿»þ¤Ç¤µ¤¨¥Ç¥Õ¥©¥ë¥È¥ë¡¼¥ë¤ò´Þ¤ß¤Þ¤¹)¡¢ Àµ¤·¤¤ ctr ¤ÎÀë¸À¤Ï¼¡¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹:
int ctr[YY_NUM_RULES];
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%{
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[0-9]+ yylval = atoi( yytext ); return TOK_NUMBER;
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- ÆþÎϤ«¤éÆɤ߼è¤Ã¤¿¸½ºß¤Î¹ÔÈÖ¹æ¤ò¥°¥í¡¼¥Ð¥ëÊÑ¿ô yylineno ¤ËÊÝ»ý¤¹¤ë¥¹¥¥ã¥Ê¤òÀ¸À®¤¹¤ë¤è¤¦¤Ë¡¢ flex ¤Ë»Ø¼¨¤·¤Þ¤¹¡£ ¤³¤Î¥ª¥×¥·¥ç¥ó¤Ï %option lex-compat ¤«¤é°ÅÌÛŪ¤Ë»ØÄꤵ¤ì¤Þ¤¹¡£
- yywrap
- ¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç (¤¹¤Ê¤ï¤Á %option noyywrap) ¡¢¥¹¥¥ã¥Ê¤Ï¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤ËºÝ¤· yywrap() ¤ò¸Æ¤Ð¤ºÃ±¤Ë¥¹¥¥ã¥ó¤¹¤Ù¤¥Õ¥¡¥¤¥ë¤¬¤â¤¦Ìµ¤¤¤â¤Î¤È¤¹¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹( ¥æ¡¼¥¶¤¬ yyin ¤ò¿·¤·¤¤¥Õ¥¡¥¤¥ë¤ò»Ø¤¹¤è¤¦¤Ë¤·¡¢ºÆÅÙ yylex() ¤ò¸Æ¤Ó½Ð¤¹¤Þ¤Ç¤Ç¤¹)¡£
flex ¤Ï¥ë¡¼¥ë¥¢¥¯¥·¥ç¥ó¤ò¥¹¥¥ã¥ó¤·¡¢ REJECT ¤È yymore() ¤Îµ¡Ç½¤¬»È¤ï¤ì¤Æ¤¤¤ë¤«¤É¤¦¤«¤òÄ´¤Ù¤Þ¤¹¡£ reject ¤È yymore ¤Î¥ª¥×¥·¥ç¥ó¤ò»ÈÍѤ¹¤ë¤È¡¢ ¥ª¥×¥·¥ç¥ó¤Ç»ØÄꤷ¤¿Ä̤ê¤Ë¤³¤ÎȽÄê¤ËÍ¥À褷¤Þ¤¹¡£ ¥ª¥×¥·¥ç¥ó¤Î»ØÄê¤Ï¡¢¥»¥Ã¥È¤·¤Æµ¡Ç½¤ò»ÈÍѤ·¤Æ¤¤¤ë¤³¤È¤ò¼¨¤¹(Î㤨¤Ð %option reject) ¡¢¤â¤·¤¯¤Ï¥¢¥ó¥»¥Ã¥È¤·¤Æµ¡Ç½¤ò»ÈÍѤ·¤Æ¤¤¤Ê¤¤¤³¤È¤ò¼¨¤¹(Î㤨¤Ð %option noyymore) ¤â¤Î¤È¤·¤Þ¤¹¡£
¼¡¤Î¥ª¥×¥·¥ç¥ó¤Ïʸ»úÎó¤ÎÃͤò¼è¤ê¡¢'=' ¤Ç¶èÀÚ¤ê¤Þ¤¹:
%option outfile="ABC"
¤³¤ì¤Ï -oABC ¤ÈƱ¤¸¤Ç¤¢¤ê¡¢
%option prefix="XYZ"
¤Ï -PXYZ ¤ÈƱ¤¸¤Ç¤¹¡£ ºÇ¸å¤Ë¡¢
%option yyclass="foo"
¤Ï C++ ¥¹¥¥ã¥ÊÀ¸À®»þ¤Î¤ß͸ú( -+ ¥ª¥×¥·¥ç¥ó)¤Ç¤¹¡£¤³¤ì¤Ï flex ¤ËÂФ·¤Æ¡¢ foo ¤¬ yyFlexLexer ¤Î¥µ¥Ö¥¯¥é¥¹¤Ç¤¢¤ë¤³¤È¤òÃΤ餻¤Þ¤¹¤Î¤Ç¡¢ flex ¤Ï¥¢¥¯¥·¥ç¥ó¤ò yyFlexLexer::yylex() ¤Ç¤Ï¤Ê¤¯ foo::yylex() ¤Î¥á¥ó¥Ð´Ø¿ô¤È¤·¤Þ¤¹¡£ ¤Þ¤¿¡¢( yyFlexLexer::LexerError() ¤òµ¯Æ°¤¹¤ë¤³¤È¤Ë¤è¤ê)¸Æ¤Ó½Ð¤¹¤È¼Â¹Ô»þ¥¨¥é¡¼¤ò½üµî¤¹¤ë yyFlexLexer::yylex() ¥á¥ó¥Ð´Ø¿ô¤òÀ¸À®¤·¤Þ¤¹¡£ ¾ÜºÙ¤Ï¸å½Ò¤Î C++ ¥¹¥¥ã¥Ê¤ÎÀ¸À®¤ò¸«¤Æ²¼¤µ¤¤¡£ À¸À®¤µ¤ì¤¿¥¹¥¥ã¥Ê¤«¤éÉÔÍפʥ롼¥Á¥ó¤ò½ü¤¤¿¤¤ lint ½ãÀµ¼çµÁ¼Ô¤Î¤¿¤á¤Ë ¿¤¯¤Î¥ª¥×¥·¥ç¥ó¤¬ÍÑ°Õ¤µ¤ì¤Æ¤¤¤Þ¤¹¡£ °Ê²¼¤ò¥¢¥ó¥»¥Ã¥È¤¹¤ë¤È(Î㤨¤Ð %option nounput )¡¢Âбþ¤¹¤ë¥ë¡¼¥Á¥ó¤ÏÀ¸À®¤µ¤ì¤ë¥¹¥¥ã¥Ê¤«¤é½ü¤«¤ì¤Þ¤¹:
input, unput
yy_push_state, yy_pop_state, yy_top_state
yy_scan_buffer, yy_scan_bytes, yy_scan_string
( yy_push_state() Åù¤Ï %option stack ¤ò»ÈÍѤ·¤Ê¤¤¾ì¹ç¤Ë¤Ï¸½¤ì¤Þ¤»¤ó)¡£ Àǽ´ØÏ¢
flex ¤Î¼ç¤Ê¥Ç¥¶¥¤¥ó¥´¡¼¥ë¤Ï¹âÀǽ¤Ê¥¹¥¥ã¥Ê¤òÀ¸À®¤¹¤ë¤³¤È¤Ç¤¹¡£ ¿¤¯¤Î¥ë¡¼¥ë¥»¥Ã¥È¤òÎɤ¯°·¤¦¤³¤È¤ÇºÇŬ²½¤µ¤ì¤Þ¤¹¡£ ´û¤Ë³µÀ⤷¤¿ -C ¥ª¥×¥·¥ç¥ó»ÈÍѤˤè¤ë¥Æ¡¼¥Ö¥ë°µ½Ì¤Ëµ¯°ø¤¹¤ë®Å٤ؤαƶÁ¤Î¾¤Ë¡¢ Àǽ¤ò°²½¤µ¤»¤ë¿¤¯¤Î¥ª¥×¥·¥ç¥ó/¥¢¥¯¥·¥ç¥ó¤¬¤¢¤ê¤Þ¤¹¡£ ¤½¤ì¤é¤ò¹â²Á¤Ê¤â¤Î¤«¤é°Â²Á¤Ê¤â¤Î¤Ø¤Èʤ٤ޤ¹:
REJECT
%option yylineno
¼«Í³Ä¹¤Î±¦Ê¸Ì®(trailing context)
¥Ð¥Ã¥¯¥¢¥Ã¥×¤¬É¬Íפʥѥ¿¡¼¥ó¤ÎÁÈ
%array
%option interactive
%option always-interactive
'^' ¹ÔƬ¥ª¥Ú¥ì¡¼¥¿
yymore()
ºÇ½é¤Î 3 ¤Ä¤ÏÈó¾ï¤Ë¹â²Á¤Ç¤¢¤ê¡¢ºÇ¸å¤Î 2 ¤Ä¤ÏÈó¾ï¤Ë°Â²Á¤Ç¤¹¡£ unput() ¤ÏÀøºßŪ¤ËÈó¾ï¤ËÂ礤ʻŻö¤ò¤¹¤ë¥ë¡¼¥Á¥ó¸Æ¤Ó½Ð¤·¤È¤·¤Æ¼ÂÁõ¤µ¤ì¤Æ¤¤¤ë¤Î¤ËÂФ·¡¢ yyless() ¤ÏÈó¾ï¤Ë°Â²Á¤Ê¥Þ¥¯¥í¤Ç¤¹; ¤Ç¤¹¤«¤é¥¹¥¥ã¥ó¤·¤¿Í¾Ê¬¤Ê¥Æ¥¥¹¥È¤òÌ᤹¤À¤±¤Î¾ì¹ç¤Ë¤Ï yyless() ¤ò»È¤Ã¤Æ²¼¤µ¤¤¡£ Àǽ¤¬½ÅÍפʾì¹ç¤Ë¤Ï¡¢½ÐÍ褦¤ë¸Â¤ê¤ÎÅØÎϤǤâ¤Ã¤Æ REJECT ¤òÈò¤±¤Æ²¼¤µ¤¤¡£ ¤³¤ì¤ÏÆä˹â²Á¤Ê¥ª¥×¥·¥ç¥ó¤Ç¤¹¡£
¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¼è¤ê½ü¤¯¤È¡¢Í𻨤ˤʤꡢ ¤Ò¤É¤¯¶ìÏ«¤·¤ÆÊ£»¨¤Ê¥¹¥¥ã¥Ê¤òºî¤ë¤³¤È¤Ë¤Ê¤ê¤Þ¤¹¡£ ¼ÂºÝŪ¤Ë¤Ï -b ¥Õ¥é¥°¤ò»ØÄꤷ¤Æ lex.backup ¥Õ¥¡¥¤¥ë¤òÀ¸À®¤¹¤ë¤³¤È¤«¤é»Ï¤á¤Þ¤¹¡£Î㤨¤Ð¡¢ÆþÎÏ
%%
foo return TOK_KEYWORD;
foobar return TOK_KEYWORD;
¤ËÂФ·¤Æ¤Ï¡¢¥Õ¥¡¥¤¥ë¤Ï¼¡¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹:
State #6 is non-accepting -
associated rule line numbers:
2 3
out-transitions: [ o ]
jam-transitions: EOF [ \001-n p-\177 ]
State #8 is non-accepting -
associated rule line numbers:
3
out-transitions: [ a ]
jam-transitions: EOF [ \001-` b-\177 ]
State #9 is non-accepting -
associated rule line numbers:
3
out-transitions: [ r ]
jam-transitions: EOF [ \001-q s-\177 ]
Compressed tables always back up.
ºÇ½é¤Î¿ô¹Ô¤Ï¡¢ 'o' ¤ËÁ«°Ü¤Ç¤¤ë¤¬Â¾¤Îʸ»ú¤Ë¤ÏÁ«°Ü¤Ç¤¤Ê¤¤¾õÂÖ¤¬¤¢¤ê¡¢ ¤½¤Î¾õÂ֤Ǥϸ½ºß¥¹¥¥ã¥ó¤µ¤ì¤¿¥Æ¥¥¹¥È¤Ï¾¤Î¥ë¡¼¥ë¤Ë¤Ï¥Þ¥Ã¥Á¤·¤Ê¤¤¤³¤È¤ò ɽ¤·¤Þ¤¹¡£ ¤³¤Î¾õÂÖ¤¬È¯À¸¤·¤¿¤Î¤Ï¡¢ ÆþÎÏ¥Õ¥¡¥¤¥ë¤Î¹Ô 2, 3 ¤Î¥ë¡¼¥ë¤Ë¥Þ¥Ã¥Á¤·¤è¤¦¤È¤·¤¿»þ¤Ç¤¹¡£ ¥¹¥¥ã¥Ê¤¬¤³¤ÎÍͤʾõÂ֤ˤ¢¤ê 'o' °Ê³°¤Îʸ»ú¤òÆɤó¤À¾ì¹ç¤Ë¤Ï¡¢ ¥Þ¥Ã¥Á¤¹¤ë¥ë¡¼¥ë¤òõ¤¹¤¿¤á¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×¤¬É¬ÍפȤʤê¤Þ¤¹¡£ ¾¯¤·¹Í¤¨¤ì¤Ð¡¢¤³¤ì¤Ï "fo" ¤ò¸«¤¿»þ¤Ë¤¢¤ë¾õÂ֤˰㤤¤Ê¤¤¤³¤È¤¬Ê¬¤«¤ë¤Ç¤·¤ç¤¦¡£ ¤³¤ÎÍͤʻþ¡¢'o' °Ê³°¤Î¤â¤Î¤¬¸½¤ì¤ë¤È¡¢ ¥¹¥¥ã¥Ê¤Ï¡¢Ã±¤Ë 'f' ¤Ë¥Þ¥Ã¥Á¤¹¤ë(¥Ç¥Õ¥©¥ë¥È¥ë¡¼¥ë)¤È¤³¤í¤Þ¤Ç Ìá¤ê(¥Ð¥Ã¥¯¥¢¥Ã¥×¤·)¤Þ¤¹¡£ ¾õÂÖ #8 ¤Ë´Ø·¸¤¹¤ë¥³¥á¥ó¥È¤Ï¡¢ "foob" ¤¬¥¹¥¥ã¥ó¤µ¤ì¤¿»þ¤ËÌäÂ꤬¤¢¤ë¤³¤È¤òɽ¤·¤Æ¤¤¤Þ¤¹¡£ ¼ÂºÝ¡¢'a' °Ê³°¤Îʸ»ú¤Ë½Ð²ñ¤¦¤È¡¢¥¹¥¥ã¥Ê¤Ï "foo" ¤ò¼õÍý¤¹¤ë¤È¤³¤í¤Þ¤ÇÌá¤ê¤Þ¤¹¡£ ƱÍͤ˾õÂÖ #9 ¤Ë´Ø·¸¤¹¤ë¥³¥á¥ó¥È¤Ï¡¢ "fooba" ¤¬¥¹¥¥ã¥ó¤µ¤ì 'r' ¤¬Â³¤«¤Ê¤¤¾ì¹ç¤Ë´Ø·¸¤·¤Þ¤¹¡£
ºÇ¸å¤Î¥³¥á¥ó¥È¤¬ÄÌÃΤ¹¤ë¤Î¤Ï¡¢ -Cf ¤ä -CF ¤ò»È¤Ã¤Æ¤¤¤ë¤Î¤Ç¤Ê¤±¤ì¤Ð ¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¼è¤ê½ü¤³¤¦¤ÈÅØÎϤ¹¤ë¤³¤È¤Ï̵°ÕÌ£¤Ç¤¢¤ë¤³¤È¤Ç¤¹¡£ ¤Ê¤¼¤Ê¤é¡¢°µ½Ì¤µ¤ì¤¿¥¹¥¥ã¥Ê¤ËÂФ·¤Æ¤½¤Î¤è¤¦¤Ê¤³¤È¤ò¤·¤Æ¤â¡¢ Àǽ¾å¤ÎÍø±×¤Ï̵¤¤¤«¤é¤Ç¤¹¡£
¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¼è¤ê½ü¤¯¤¿¤á¤Ë¤Ï "¥¨¥é¡¼" ¥ë¡¼¥ë¤òÄɲä·¤Þ¤¹:
%%
foo return TOK_KEYWORD;
foobar return TOK_KEYWORD;
fooba |
foob |
fo {
/* false alarm, not really a keyword */
return TOK_ID;
}
¥¡¼¥ï¡¼¥É¤Î¥ê¥¹¥È¤«¤é¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò¼è¤ê½ü¤¯¤Ë¤Ï¡¢"Á´¤Æ¤òÊá¤Þ¤¨¤ë" ¥ë¡¼¥ë¤ò»ÈÍѤ¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹:
%%
foo return TOK_KEYWORD;
foobar return TOK_KEYWORD;
[a-z]+ return TOK_ID;
Ä̾ŬÀڤʻþ¤Ë¤Ï¤³¤ì¤Ï°ìÈÖÎɤ¤²ò·èºö¤Ç¤¹¡£ ¥Ð¥Ã¥¯¥¢¥Ã¥×¥á¥Ã¥»¡¼¥¸¤Ï¥«¥¹¥±¡¼¥É¤¹¤ë¤³¤È¤¬Â¿¤¤¤Ç¤¹¡£ Ê£»¨¤Ê¥ë¡¼¥ë¤ÎÁȤǤϡ¢¿ôÉ´¤â¤Î¥á¥Ã¥»¡¼¥¸¤òÆÀ¤ë¤Î¤ÏÉáÄ̤Τ³¤È¤Ç¤¹¡£ ¤·¤«¤·¡¢¤³¤ì¤ò²òÀϤ¹¤ì¤Ð¡¢¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò½üµî¤¹¤ë¤¿¤á¤Ë¤Ï ÂçÄñ¤Î¾ì¹ç¿ô¥À¡¼¥¹¤Î¥ë¡¼¥ë¤Ë¤À¤±´Ø·¸¤¢¤ë¤³¤È¤¬Ê¬¤«¤ë¤Ç¤·¤ç¤¦ (¤·¤«¤·¡¢´Ö°ã¤¨¤ë¤³¤È¤¬Â¿¤¯¡¢¸í¤Ã¤¿¥ë¡¼¥ë¤¬¶öÁ³Í¸ú¤Ê¥È¡¼¥¯¥ó¤Ë¥Þ¥Ã¥Á¤·ÆÀ¤Þ¤¹¡£ ¾Íè¤Î flex ¤Îµ¡Ç½¤Ç¤Ï¡¢ ¼«Æ°Åª¤Ë¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò½üµî¤¹¤ë¥ë¡¼¥ë¤òÄɲ乤ë¤è¤¦¤Ë¤Ê¤ë¤«¤âÃΤì¤Þ¤»¤ó)¡£
¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò½üµî¤¹¤ë¤³¤È¤Ë¤è¤êÍø±×¤¬¤¢¤ë¤Î¤Ï¡¢ Á´¤Æ¤Î ¥Ð¥Ã¥¯¥¢¥Ã¥×¤ò½üµî¤·¤¿»þ¤À¤±¤È¤¤¤¦¤³¤È¤ò³Ð¤¨¤Æ¤ª¤¯¤³¤È¤Ï½ÅÍפǤ¹¡£ ¤¿¤Ã¤¿°ì¤Ä¤ò»Ä¤·¤Æ¤â²¿¤âÆÀ¤ë¤³¤È¤¬½ÐÍè¤Þ¤»¤ó¡£
²ÄÊÑŤΠ±¦Ê¸Ì® (º¸Éôʬ¤È±¦Éôʬ¤Î¤¤¤º¤ì¤«¤â¤·¤¯¤ÏξÊý¤¬²ÄÊÑĹ)¤Ï REJECT ¤È¤Û¤ÜƱ¤¸¤À¤±¤Î(¤¹¤Ê¤ï¤ÁÁêÅö¤Î)ÀǽÎô²½¤È¤Ê¤ê¤Þ¤¹¡£ ¤½¤Î¤¿¤á¼¡¤Î¤è¤¦¤Ê¥ë¡¼¥ë:
%%
mouse|rat/(cat|dog) run();
¤Ï¼¡¤Î¤è¤¦¤Ë½ñ¤¯¤«:
%%
mouse/cat|dog run();
rat/cat|dog run();
¼¡¤Î¤è¤¦¤Ë½ñ¤¤¤¿Êý¤¬Îɤ¤¤Ç¤¹:
%%
mouse|rat/cat run();
mouse|rat/dog run();
ÆÃÊÌ¤Ê '|' ¥¢¥¯¥·¥ç¥ó¤Ï½õ¤±¤Ë¤Ï¤Ê¤ê ¤Þ¤»¤ó ¤·¡¢¤«¤¨¤Ã¤Æ¾õ¶·¤ò°¤¯¤·¤Þ¤¹ (¸å½Ò¤Î·ç´Ù/¥Ð¥°¤ò»²¾È)¡£ ¥¹¥¥ã¥Ê¤ÎÀǽ¤ò¸þ¾å¤µ¤»¤ë¤¿¤á¤Î;ÃÏ(¼Â¸½¤ÏºÇ¤âÍÆ°×)¤Ï¡¢ ¥Þ¥Ã¥Á¤¹¤ë¥È¡¼¥¯¥ó¤¬Ä¹¤±¤ì¤Ð¥¹¥¥ã¥Ê¤¬¹â®¤Ë¤Ê¤ë¤³¤È¤Ë¤¢¤ê¤Þ¤¹¡£ Ť¤¥È¡¼¥¯¥ó¤Ç¤Ï¤Û¤È¤ó¤É¤ÎÆþÎϽèÍý¤Ï(û¤¤)ÆâÉô¥ë¡¼¥×¤Ç½èÍý¤µ¤ì¡¢ ¥¢¥¯¥·¥ç¥ó¤Î¤¿¤á¤Ë¥¹¥¥ã¥Ê´Ä¶¤òÀßÄꤹ¤ëÄɲäλŻö(Î㤨¤Ð yytext) ¤ò¤Û¤È¤ó¤É¤·¤Ê¤¤¤«¤é¤Ç¤¹¡£ C ¥³¥á¥ó¥È¤Î¥¹¥¥ã¥Ê¤ò»×¤¤½Ð¤·¤Þ¤·¤ç¤¦:
%x comment
%%
int line_num = 1;
"/*" BEGIN(comment);
<comment>[^*\n]*
<comment>"*"+[^*/\n]*
<comment>\n ++line_num;
<comment>"*"+"/" BEGIN(INITIAL);
¼¡¤Î¤è¤¦¤Ë½ñ¤¯¤È¹â®¤Ë¤Ê¤ê¤Þ¤¹:
%x comment
%%
int line_num = 1;
"/*" BEGIN(comment);
<comment>[^*\n]*
<comment>[^*\n]*\n ++line_num;
<comment>"*"+[^*/\n]*
<comment>"*"+[^*/\n]*\n ++line_num;
<comment>"*"+"/" BEGIN(INITIAL);
º£Å٤ϡ¢²þ¹ÔËè¤ËÊ̤Υ¢¥¯¥·¥ç¥ó¤Î½èÍý¤ò¹Ô¤¦¤Î¤Ç¤Ï¤Ê¤¯¡¢ ²þ¹Ôǧ¼±¤Ï¥ë¡¼¥ë´Ö¤Ç "ʬ»¶" ¤µ¤ì¡¢ ²Äǽ¤Ê¸Â¤êŤ¤¥Æ¥¥¹¥È¤Ë¥Þ¥Ã¥Á¤¹¤ë¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤Þ¤¹¡£ ¥ë¡¼¥ë¤Î Äɲà ¤Ï¥¹¥¥ã¥Ê¤òÃÙ¤¯ ¤·¤Þ¤»¤ó! ¥¹¥¥ã¥Ê¤Î®Å٤ϡ¢¥ë¡¼¥ë¿ô¤È¤â¡¢ ¥ª¥Ú¥ì¡¼¥¿ '*' ¤ä '|' ¤È¤¤¤Ã¤¿¤â¤Î¤Ë´ð¤Å¤¯¥ë¡¼¥ë¤ÎÊ£»¨¤µ (¤³¤ÎÀá¤Î»Ï¤á¤Ç°·¤¤¤Þ¤·¤¿)¤È¤âÆÈΩ¤Ç¤¹¡£ ºÇ¸å¤Î¹â®²½¤ÎÎã¤Ç¤¹: 1 ¹Ô¤Ë 1 ¤Ä¤º¤Ä¤Ç¤¢¤êÊ̤Îʸ»ú¤ÏÉÕ¤«¤Ê¤¤¤è¤¦¤Ê¡¢ ¼±Ê̻Ҥȥ¡¼¥ï¡¼¥É¤òÁ´¤Æ¥Õ¥¡¥¤¥ë¤«¤é¥¹¥¥ã¥ó¤¹¤ë¤³¤È¤ò¹Í¤¨¤Þ¤¹¡£ ºÇ½é¤Ï¼¡¤Î¤è¤¦¤Ë¤Ê¤ë¤Ç¤·¤ç¤¦:
%%
asm |
auto |
break |
... etc ...
volatile |
while /* it's a keyword */
.|\n /* it's not a keyword */
¸åÌá¤ê¤òÈò¤±¤ë¤¿¤á¤ËÁ´¤Æ¤òÊá¤Þ¤¨¤ë¥ë¡¼¥ë¤òƳÆþ¤·¤Þ¤¹:
%%
asm |
auto |
break |
... etc ...
volatile |
while /* it's a keyword */
[a-z]+ |
.|\n /* it's not a keyword */
1 ¹Ô¤ËÀµ³Î¤Ë 1 ¸ì¤À¤±¤¢¤ë¤³¤È¤¬Êݾڤµ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢ ²þ¹Ô¤Îǧ¼±¤òÊ̤Υȡ¼¥¯¥ó¤ÈÊ»¤»¤ë¤³¤È¤Ç¡¢ ¥Þ¥Ã¥Á¤ÎÁí¿ô¤òȾʬ¤Ë¸º¤é¤¹¤³¤È¤¬½ÐÍè¤Þ¤¹:
%%
asm\n |
auto\n |
break\n |
... etc ...
volatile\n |
while\n /* it's a keyword */
[a-z]+\n |
.|\n /* it's not a keyword */
¤³¤³¤Ç¡¢ºÆÅ٥Х寥¢¥Ã¥×¤ò¥¹¥¥ã¥Ê¤ËÁȤ߹þ¤ó¤À¤³¤È¤Ë µ¤¤òÉÕ¤±¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£ ¼ÂºÝ ²æ¡¹¤Ï ÆþÎÏ¥¹¥È¥ê¡¼¥à¤Ï¥ì¥¿¡¼¤È²þ¹Ô¤À¤±¤Ç¤¢¤ë¤³¤È¤òÃΤäƤ¤¤Þ¤¹¤¬¡¢ flex ¤Ï¤³¤ì¤¬Ê¬¤«¤é¤Ê¤¤¤¿¤á¡¢ ¥È¡¼¥¯¥ó "auto" ¤Ê¤É¤ò¥¹¥¥ã¥ó¤·¤¿¼¡¤Îʸ»ú¤¬²þ¹Ô¤Ç¤â¥ì¥¿¡¼¤Ç¤â¤Ê¤¤¾ì¹ç¤Ë¤Ï ¥Ð¥Ã¥¯¥¢¥Ã¥×¤¬É¬ÍפǤ¢¤ë¤È¹Í¤¨¤Þ¤¹¡£ °ÊÁ°¤Ï "auto" ¥ë¡¼¥ë¤ËŬ¹ç¤·¤½¤ì¤Ç½ª¤ê¤Ç¤·¤¿¤¬¡¢ º£¤Ï "auto" ¥ë¡¼¥ë¤Ï̵¤¯¡¢"auto\n" ¥ë¡¼¥ë¤À¤±¤¬¤¢¤ê¤Þ¤¹¡£ ¥Ð¥Ã¥¯¥¢¥Ã¥×¤Î²ÄǽÀ¤ò½üµî¤¹¤ë¤¿¤á¤Ë¤Ï¡¢ ºÇ¸å¤Î²þ¹Ô°Ê³°¤Î¥ë¡¼¥ë¤òÆó½Å²½¤¹¤ë¤«¡¢ ¤½¤Î¤è¤¦¤ÊÆþÎϤ˽Ф¯¤ï¤µ¤Ê¤¤¤Î¤ÇʬÎà¤ÏÉÔÍפÈʬ¤«¤Ã¤Æ¤¤¤ë¤¿¤á¡¢ ²þ¹Ô¤òƳÆþ¤·¤Ê¤¤¤â¤¦°ì¤Ä¤ÎÁ´¤Æ¤òÊá¤Þ¤¨¤ë¥ë¡¼¥ë¤òƳÆþ¤¹¤ë¤³¤È¤¬½ÐÍè¤Þ¤¹:
%%
asm\n |
auto\n |
break\n |
... etc ...
volatile\n |
while\n /* it's a keyword */
[a-z]+\n |
[a-z]+ |
.|\n /* it's not a keyword */
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- const char* YYText()
- ºÇ¸å¤Ë¥Þ¥Ã¥Á¤·¤¿¥Æ¥¥¹¥È¤òÊÖ¤·¤Þ¤¹¡£ yytext ¤ÈÅù²Á¤Ç¤¹¡£
- int YYLeng()
- ºÇ¸å¤Ë¥Þ¥Ã¥Á¤·¤¿¥È¡¼¥¯¥ó¤ÎŤµ¤òÊÖ¤·¤Þ¤¹¡£ yyleng ¤ÈÅù²Á¤Ç¤¹¡£
- int lineno() const
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- void set_debug( int flag )
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- int debug() const
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2 ÈÖÌܤΥ¯¥é¥¹¤Ï FlexLexer.h ¤ÇÄêµÁ¤µ¤ì¤ë yyFlexLexer ¤Ç¤¢¤ê¡¢ FlexLexer ¤«¤éƳ½Ð¤·¤¿¤â¤Î¤Ç¤¹¡£ °Ê²¼¤ÎÄɲäΥá¥ó¥Ð´Ø¿ô¤òÄêµÁ¤·¤Þ¤¹:
- yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 )
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- virtual int yylex()
- ¤³¤ì¤Ï yylex() ¤¬Ä̾ï¤Î flex ¥¹¥¥ã¥Ê¤ËÂФ·¤Æ¹Ô¤Ã¤¿¤Î¤ÈƱÍͤÎÌò³ä¤òô¤¤¤Þ¤¹: ¥ë¡¼¥ë¤Î¥¢¥¯¥·¥ç¥ó¤¬ÃͤòÊÖ¤¹¤Þ¤Ç¡¢ ÆþÎÏ¥¹¥È¥ê¡¼¥à¤ò¥¹¥¥ã¥ó¤·¡¢¥È¡¼¥¯¥ó¤ò¾ÃÈñ¤·¤Þ¤¹¡£ yyFlexLexer ¤«¤é¥µ¥Ö¥¯¥é¥¹ S ¤òƳ½Ð¤· yylex() ¤«¤é S ¤Î¥á¥ó¥Ð´Ø¿ô¤ª¤è¤ÓÊÑ¿ô¤ò¥¢¥¯¥»¥¹¤·¤¿¤¤¾ì¹ç¡¢ %option yyclass=S ¤ò»ØÄꤷ¤Æ yyFlexLexer ¤Ç¤Ï¤Ê¤¯¥µ¥Ö¥¯¥é¥¹¤ò»ÈÍѤ¹¤ë¤³¤È¤ò flex ¤ËÃΤ餻¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£ ¤³¤Î¾ì¹ç yyFlexLexer::yylex() ¤òÀ¸À®¤¹¤ë¤Î¤Ç¤Ï¤Ê¤¯¡¢ flex ¤Ï S::yylex() (¤ª¤è¤Ó¸Æ¤Ó½Ð¤µ¤ì¤¿¤Ê¤é yyFlexLexer::LexerError() ¤ò¸Æ¤Ó½Ð¤¹¥À¥ß¡¼¤Î yyFlexLexer::yylex() ¤â)¤òÀ¸À®¤·¤Þ¤¹¡£
- virtual void switch_streams(istream* new_in = 0,
- ostream* new_out = 0) yyin ¤ò new_in (Èó¥Ë¥ë¤Î¾ì¹ç) ¤ËºÆ³äÅö¤·¡¢ yyout ¤ò new_out (ƱÍÍ)¤ËºÆ³äÅö¤·¤Þ¤¹¡£ yyin ¤¬ºÆ³äÅö¤µ¤ì¤¿¾ì¹ç¤Ë¤Ï°ÊÁ°¤ÎÆþÎϥХåե¡¤Ï¾Ãµî¤µ¤ì¤Þ¤¹¡£
- int yylex( istream* new_in, ostream* new_out = 0 )
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- virtual int LexerInput( char* buf, int max_size )
- ºÇÂç max_size ʸ»ú¤ò buf ¤ËÆɤ߹þ¤ß¡¢Æɤ᤿ʸ»ú¿ô¤òÊÖ¤·¤Þ¤¹¡£ ÆþÎϤνª¤ê¤ò¼¨¤¹¤Ë¤Ï 0 ʸ»ú¤òÊÖ¤·¤Þ¤¹¡£"ÂÐÏÃŪ" ¥¹¥¥ã¥Ê( -B ¤È -I ¥Õ¥é¥°¤ò»²¾È)¤Ï¥Þ¥¯¥í YY_INTERACTIVE ¤òÄêµÁ¤¹¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£ LexerInput() ¤òºÆÄêµÁ¤·¡¢ ÂÐÏÃŪ¤ÊÆþÎϸµ¤ò¥¹¥¥ã¥ó¤¹¤ë²ÄǽÀ¤¬¤¢¤ë¤«¤É¤¦¤«¤Ë°Í¸¤·¤Æ °Û¤Ê¤ë¥¢¥¯¥·¥ç¥ó¤¬É¬ÍפȤʤë¾ì¹ç¡¢ ¤³¤Î̾Á°¤¬Â¸ºß¤¹¤ë¤«¤É¤¦¤«¤Î¥Æ¥¹¥È¤Ï #ifdef ¤Ë¤Æ²Äǽ¤Ç¤¹¡£
- virtual void LexerOutput( const char* buf, int size )
- size ʸ»ú¤ò¥Ð¥Ã¥Õ¥¡ buf ¤«¤é½ñ¤½Ð¤·¤Þ¤¹¡£ ¥¹¥¥ã¥Ê¤Î¥ë¡¼¥ë¤¬ NUL ¤ò´Þ¤à¥Æ¥¥¹¥È¤Ë¥Þ¥Ã¥Á²Äǽ¤Ê¾ì¹ç¡¢ NUL ½ªÃ¼¤µ¤ì¤Æ¤¤¤ë¤³¤Î¥Ð¥Ã¥Õ¥¡¤Ï "ÆâÉô¤Ë" NUL ¤ò´Þ¤ó¤Ç¤¤¤Æ¤â¹½¤¤¤Þ¤»¤ó¡£
- virtual void LexerError( const char* msg )
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yyFlexLexer ¥ª¥Ö¥¸¥§¥¯¥È¤Ï Á´¤Æ¤Î ¥¹¥¥ã¥ó»þ¤Î¾õÂÖ¤ò´Þ¤à¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤¡£ ¤½¤ì¤æ¤¨¤³¤ÎÍͤʥª¥Ö¥¸¥§¥¯¥È¤ò¥ê¥¨¥ó¥È¥é¥ó¥È¤Ê¥¹¥¥ã¥Ê¤È¤·¤Æ»ÈÍѤǤ¤Þ¤¹¡£ Ʊ°ì¤Î yyFlexLexer ¥¯¥é¥¹¤ÎÊ£¿ô¤Î¥¤¥ó¥¹¥¿¥ó¥¹¤ò¶ñÂβ½²Äǽ¤Ç¤¢¤ê¡¢ Ê£¿ô¤Î C++ ¥¹¥¥ã¥Ê¥¯¥é¥¹¤òÁȤ߹ç¤ï¤»¾åµ -P ¥ª¥×¥·¥ç¥ó¤ò»ÈÍѤ¹¤ë¤³¤È¤ÇƱ°ì¤Î¥×¥í¥°¥é¥à¤Ç»ÈÍѲÄǽ¤Ç¤¹¡£
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ñ½ã¤Ê C++ ¥¹¥¥ã¥Ê¤ÎÎã¤ò°Ê²¼¤Ë¼¨¤·¤Þ¤¹:
// An example of using the flex C++ scanner class.
%{
int mylineno = 0;
%}
string \"[^\n"]+\"
ws [ \t]+
alpha [A-Za-z]
dig [0-9]
name ({alpha}|{dig}|\$)({alpha}|{dig}|[_.\-/$])*
num1 [-+]?{dig}+\.?([eE][-+]?{dig}+)?
num2 [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
number {num1}|{num2}
%%
{ws} /* skip blanks and tabs */
"/*" {
int c;
while((c = yyinput()) != 0)
{
if(c == '\n')
++mylineno;
else if(c == '*')
{
if((c = yyinput()) == '/')
break;
else
unput(c);
}
}
}
{number} cout << "number " << YYText() << '\n';
\n mylineno++;
{name} cout << "name " << YYText() << '\n';
{string} cout << "string " << YYText() << '\n';
%%
int main( int /* argc */, char** /* argv */ )
{
FlexLexer* lexer = new yyFlexLexer;
while(lexer->yylex() != 0)
;
return 0;
}
Ê£¿ô¤Î(°Û¤Ê¤Ã¤¿)»ú¶ç²òÀÏ¥¯¥é¥¹¤òÀ¸À®¤·¤¿¤¤¾ì¹ç¡¢ -P ¥Õ¥é¥° (¤â¤·¤¯¤Ï prefix= ¥ª¥×¥·¥ç¥ó) ¤ò»ÈÍѤ·¤Æ³Æ yyFlexLexer ¤ò xxFlexLexer Åù¤ÎÊ̤Î̾Á°¤Ë¤·¤Þ¤¹¡£ ¼¡¤Ë»ú¶ç²òÀÏ¥¯¥é¥¹¤Î¥½¡¼¥¹¤´¤È¤Ë <FlexLexer.h> ¤ò¥¤¥ó¥¯¥ë¡¼¥É¤·¤Þ¤¹¡£ °Ê²¼¤Î¤è¤¦¤Ë yyFlexLexer ¤ò¥ê¥Í¡¼¥à¤·¤Þ¤¹:
#undef yyFlexLexer
#define yyFlexLexer xxFlexLexer
#include <FlexLexer.h>
#undef yyFlexLexer
#define yyFlexLexer zzFlexLexer
#include <FlexLexer.h>
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LEX ¤ª¤è¤Ó POSIX ¤È¤ÎÈó¸ß´¹À
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- -
- ¥É¥¥å¥á¥ó¥È¤ËµºÜ¤µ¤ì¤Æ¤¤¤Ê¤¤ lex ¥¹¥¥ã¥ÊÆâÉô¤ÎÊÑ¿ô yylineno ¤Ï -l ¤â¤·¤¯¤Ï %option yylineno ¤ò»ÈÍѤ·¤Ê¤¤¤È¥µ¥Ý¡¼¥È¤µ¤ì¤Þ¤»¤ó¡£
- yylineno ¤Ï¥¹¥¥ã¥ÊËè(ñ°ì¤Î¥°¥í¡¼¥Ð¥ëÊÑ¿ô)¤Ç¤Ï¤Ê¤¯¡¢¥Ð¥Ã¥Õ¥¡Ëè¤Ë´ÉÍý¤µ¤ì¤ë¤Ù¤¤Ç¤¹¡£
- yylineno ¤Ï POSIX »ÅÍͤǤϤ¢¤ê¤Þ¤»¤ó¡£
- -
- input() ¥ë¡¼¥Á¥ó¤ÏºÆÄêµÁ¤Ç¤¤Þ¤»¤ó¤¬¡¢ ¥ë¡¼¥ë¤Ë¥Þ¥Ã¥Á¤·¤¿¤â¤Î¤Ë¸å³¤¹¤ëʸ»ú¤òÆɤि¤á¤Ë¸Æ¤Ð¤ì¤¨¤Þ¤¹¡£ input() ¤¬¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤ËÅþ㤹¤ë¤È¡¢Ä̾ï¤Î yywrap() ½èÍý¤Ï½ªÎ»¤·¤Þ¤¹¡£``¼ÂºÝ¤Î'' ¥Õ¥¡¥¤¥ë¤Î½ª¤ê¤Ï EOF ¤È¤·¤ÆÊÖ¤µ¤ì¤Þ¤¹¡£
- ¼ÂºÝ¤Ë¤ÏÆþÎÏ¤Ï YY_INPUT ¥Þ¥¯¥í¤òÄêµÁ¤¹¤ë¤³¤È¤Ë¤è¤êÀ©¸æ¤µ¤ì¤Þ¤¹¡£
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- -
- unput() ¥ë¡¼¥Á¥ó¤ÏºÆÄêµÁ¤Ç¤¤Þ¤»¤ó¡£¤³¤ÎÀ©¸Â¤Ï POSIX ¤Ë¹çÃפ·¤Æ¤¤¤Þ¤¹¡£
- -
- flex ¥¹¥¥ã¥Ê¤Ï lex ¥¹¥¥ã¥Ê¤È¤Ï°Û¤Ê¤ê¥ê¥¨¥ó¥È¥é¥ó¥È¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡£ ¼ÂºÝ¡¢ÂÐÏÃŪ¤Ê¥¹¥¥ã¥Ê¤Ë¤ª¤¤¤Æ¡¢ ³ä¤ê¹þ¤ß¥Ï¥ó¥É¥é¤Ë¤Æ¥í¥ó¥°¥¸¥ã¥ó¥×¤òÍѤ¤¤Æ¥¹¥¥ã¥Ê¤«¤éæ½Ð¤·¡¢ ¤½¤Î¸å¥¹¥¥ã¥Ê¤òºÆÅٸƤӽФ¹¾ì¹ç¡¢°Ê²¼¤Î¥á¥Ã¥»¡¼¥¸¤òÆÀ¤ë¤Ç¤·¤ç¤¦:
fatal flex scanner internal error--end of buffer missed¥¹¥¥ã¥Ê¤ËºÆÅÙÆþ¤ë¤¿¤á¤Ë¤Ï¡¢¤Þ¤º°Ê²¼¤Î¤è¤¦¤Ë¤·¤Æ²¼¤µ¤¤yyrestart( yyin );¤³¤Î¸Æ¤Ó½Ð¤·¤Ë¤è¤êÆþÎϥХåե¡¤Ï¼Î¤Æ¤é¤ì¤ë¤³¤È¤ËÃí°Õ¤·¤Æ²¼¤µ¤¤; Ä̾盧¤ì¤ÏÂÐÏÃŪ¥¹¥¥ã¥Ê¤Ç¤ÏÌäÂê¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡£ - ¤Þ¤¿¡¢C++ ¥¹¥¥ã¥Ê¥¯¥é¥¹¤Ï¥ê¥¨¥ó¥È¥é¥ó¥È ¤Ç¤¹ ¤Î¤Ç¡¢C++ ¤ò»ÈÍѤǤ¤ë¤Î¤Ê¤é¡¢C++ ¤ò»ÈÍѤ¹¤Ù¤¤Ç¤¹¡£ Á°½Ò¤Î "C++ ¥¹¥¥ã¥Ê¤ÎÀ¸À®" ¤ò»²¾È¤·¤Æ²¼¤µ¤¤¡£
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lex(1), yacc(1), sed(1), awk(1)John Levine, Tony Mason, and Doug Brown, Lex & Yacc, O'Reilly and Associates. Âè 2 ÈǤòÆþ¼ê¤¹¤ë¤³¤È¡£
M. E. Lesk and E. Schmidt, LEX - Lexical Analyzer Generator
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