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4.4 Flex¤ÈBison

Bison¤Ï¡¢ Flex¤ÈƱÍÍ¡¢ ¤¢¤ëµ­½Ò¾ðÊó¤ò¼õ¤±¼è¤Ã¤Æ¡¢ ¤½¤ì¤ò¤â¤È¤ËC¤Î¥³¡¼¥É¤òÀ¸À®¤¹¤ë¥×¥í¥°¥é¥à¤Ç¤¹¡£ ξ¼Ô¤Î°ã¤¤¤Ï¡¢ Bison¤¬C¤äPascal¤Î¤è¤¦¤Ê¸À¸ì¤Îʸˡ¤Ë´Ø¤¹¤ëµ­½Ò¾ðÊó¤òÆþÎϤȤ·¤Æ¼õ¤±¼è¤ê¡¢ ¤½¤Îµ­½Ò¾ðÊ󤫤é¥Ñ¡¼¥µ¤òÀ¸À®¤¹¤ëÅÀ¤Ë¤¢¤ê¤Þ¤¹¡£ Flex¤ÈBison¤ò·ë¹ç¤¹¤ë¤³¤È¤Ë¤è¤ê¡¢ ¸À¸ì¤Î»ú¶ç²òÀϤȹ½Ê¸²òÀϤÎξÊý¤ò½èÍý¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£ ¡Ê¤³¤ì¤Ï¡¢ ¥³¥ó¥Ñ¥¤¥é¡¦¥Ç¥¶¥¤¥ó¤Ë¤ª¤¤¤ÆºÇ¤âÍÆ°×¤Ë¼«Æ°²½¤Ç¤­¤ëÉôʬ¤Ç¤¹¡£¡Ë

À¸À®¤µ¤ì¤ë¥Ñ¡¼¥µ¤¬µ¡Ç½¤¹¤ë¤¿¤á¤Ë¤Ï¡¢ Bison¤Ïyylex()¤È¤¤¤¦´Ø¿ô¤òɬÍפȤ·¤Þ¤¹¡£ ¤³¤Î´Ø¿ô¤Ï¥æ¡¼¥¶¤Ë¤è¤Ã¤ÆÄ󶡤µ¤ì¡¢ ¸Æ¤Ó½Ð¤µ¤ì¤¿»þ¤Ë¡¢ ¥Ñ¡¼¥¹¤µ¤ì¤Æ¤¤¤ë¸À¸ì¤Î¤¢¤ëÍ×ÁǤòɽ¤¹À°¿ôÃͤòBison¤ËÊÖ¤·¤Þ¤¹¡£ Flex¤Ë¤ª¤¤¤Æ¥¹¥­¥ã¥ó½èÍý¤ò¹Ô¤¦¥ë¡¼¥Á¥ó¤Ïyylex()¤Ç¤¢¤ê¡¢ ¥Ç¥Õ¥©¥ë¥È¤Ç¤ÏÀ°¿ôÃͤòÊÖ¤·¤Þ¤¹¡£ ¤³¤ì¤Ë¤è¤ê¡¢ Flex¤ÈBison¤ò°ì½ï¤Ë»È¤¦¤Î¤ÏÈó¾ï¤Ë´Êñ¤Ë¤Ê¤ê¤Þ¤¹¡£

·Ù¹ð¡§ °Ê²¼¤ÎÀá¤Ç¤Ï¡¢ ÆÉ¼Ô¤¬Bison¤Î´ðËÜŪ¤Ê¥Ñ¡¼¥µ¤ÎÀë¸À¤òÍý²ò¤·¤Æ¤¤¤ë¤â¤Î¤È²¾Äꤷ¤Þ¤¹¡£ Bison¤ò»È¤Ã¤¿·Ð¸³¤Î¤Ê¤¤¿Í¤Ë¤Ï¡¢ ¥Ñ¡¼¥µ¤ÎÄêµÁ¤Ïº®Íð¤ò¤â¤¿¤é¤¹²ÄǽÀ­¤¬¤¢¤ê¤Þ¤¹¤Î¤Ç¡¢ Àè¤Ë¿Ê¤àÁ°¤ËÀ§ÈóBison¤Î¥Þ¥Ë¥å¥¢¥ë¤òÆÉ¤ó¤Ç¤¯¤À¤µ¤¤¡£ Bison¤Ë¶½Ì£¤Î̵¤¤¿Í¤Ï¡¢ ¤³¤ÎÀáÁ´ÂΤòÈô¤Ð¤·¤Æ¤â¹½¤¤¤Þ¤»¤ó¡£

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