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  • 大小: 716KB
    文件類型: .zip
    金幣: 2
    下載: 1 次
    發布日期: 2021-07-26
  • 語言: C/C++
  • 標簽: 代碼??C++??lex??flex??

資源簡介

一個簡單的詞法分析器例子,運用lex編程實現將一段C語言程序轉換為詞法單元識別。

資源截圖

代碼片段和文件信息

/*?A?lexical?scanner?generated?by?flex?*/

/*?Scanner?skeleton?version:
?*?$Header:?/home/daffy/u0/vern/flex/RCS/flex.sklv?2.85?95/04/24?10:48:47?vern?Exp?$
?*/

#define?FLEX_SCANNER
#define?YY_FLEX_MAJOR_VERSION?2
#define?YY_FLEX_MINOR_VERSION?5

#include?


/*?cfront?1.2?defines?“c_plusplus“?instead?of?“__cplusplus“?*/
#ifdef?c_plusplus
#ifndef?__cplusplus
#define?__cplusplus
#endif
#endif


#ifdef?__cplusplus

#include?
#include?

/*?Use?prototypes?in?function?declarations.?*/
#define?YY_USE_PROTOS

/*?The?“const“?storage-class-modifier?is?valid.?*/
#define?YY_USE_CONST

#else /*?!?__cplusplus?*/

#if?__STDC__

#define?YY_USE_PROTOS
#define?YY_USE_CONST

#endif /*?__STDC__?*/
#endif /*?!?__cplusplus?*/

#ifdef?__TURBOC__
?#pragma?warn?-rch
?#pragma?warn?-use
#include?
#include?
#define?YY_USE_CONST
#define?YY_USE_PROTOS
#endif

#ifdef?YY_USE_CONST
#define?yyconst?const
#else
#define?yyconst
#endif


#ifdef?YY_USE_PROTOS
#define?YY_PROTO(proto)?proto
#else
#define?YY_PROTO(proto)?()
#endif

/*?Returned?upon?end-of-file.?*/
#define?YY_NULL?0

/*?Promotes?a?possibly?negative?possibly?signed?char?to?an?unsigned
?*?integer?for?use?as?an?array?index.??If?the?signed?char?is?negative
?*?we?want?to?instead?treat?it?as?an?8-bit?unsigned?char?hence?the
?*?double?cast.
?*/
#define?YY_SC_TO_UI(c)?((unsigned?int)?(unsigned?char)?c)

/*?Enter?a?start?condition.??This?macro?really?ought?to?take?a?parameter
?*?but?we?do?it?the?disgusting?crufty?way?forced?on?us?by?the?()-less
?*?definition?of?BEGIN.
?*/
#define?BEGIN?yy_start?=?1?+?2?*

/*?Translate?the?current?start?state?into?a?value?that?can?be?later?handed
?*?to?BEGIN?to?return?to?the?state.??The?YYSTATE?alias?is?for?lex
?*?compatibility.
?*/
#define?YY_START?((yy_start?-?1)?/?2)
#define?YYSTATE?YY_START

/*?Action?number?for?EOF?rule?of?a?given?start?state.?*/
#define?YY_STATE_EOF(state)?(YY_END_OF_BUFFER?+?state?+?1)

/*?Special?action?meaning?“start?processing?a?new?file“.?*/
#define?YY_NEW_FILE?yyrestart(?yyin?)

#define?YY_END_OF_BUFFER_CHAR?0

/*?Size?of?default?input?buffer.?*/
#define?YY_BUF_SIZE?16384

typedef?struct?yy_buffer_state?*YY_BUFFER_STATE;

extern?int?yyleng;
extern?FILE?*yyin?*yyout;

#define?EOB_ACT_CONTINUE_SCAN?0
#define?EOB_ACT_END_OF_FILE?1
#define?EOB_ACT_LAST_MATCH?2

/*?The?funky?do-while?in?the?following?#define?is?used?to?turn?the?definition
?*?int?a?single?C?statement?(which?needs?a?semi-colon?terminator).??This
?*?avoids?problems?with?code?like:
?*
?*? if?(?condition_holds?)
?* yyless(?5?);
?* else
?* do_something_else();
?*
?*?Prior?to?using?the?do-while?the?compiler?would?get?upset?at?the
?*?“else“?because?it?interpreted?the?“if“?statement?as?being?all
?*?done?when?it?reached?the?‘;‘?after?the?yyless()?call.
?*/

/*?Return?all?but?the?first?‘n‘?matched?characters?back?to?the?input?stream.?*/

#defin

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-01-17?13:23??lex\
?????目錄???????????0??2014-01-17?12:58??lex\lex詞法分析\
?????目錄???????????0??2014-01-17?12:58??lex\lex詞法分析\Debug\
?????文件??????204895??2011-06-14?20:30??lex\lex詞法分析\Debug\lex.exe
?????文件??????215244??2011-06-14?20:30??lex\lex詞法分析\Debug\lex.ilk
?????文件??????427008??2011-06-14?20:30??lex\lex詞法分析\Debug\lex.pdb
?????文件??????204891??2011-06-14?12:54??lex\lex詞法分析\Debug\lex.yy.exe
?????文件??????215080??2011-06-14?12:54??lex\lex詞法分析\Debug\lex.yy.ilk
?????文件???????30813??2011-06-14?12:55??lex\lex詞法分析\Debug\lex.yy.obj
?????文件??????175936??2011-06-14?12:54??lex\lex詞法分析\Debug\lex.yy.pch
?????文件??????427008??2011-06-14?12:54??lex\lex詞法分析\Debug\lex.yy.pdb
?????文件???????????0??2014-01-17?12:58??lex\lex詞法分析\Debug\output.txt
?????文件???????33792??2011-06-14?20:40??lex\lex詞法分析\Debug\vc60.idb
?????文件???????53248??2011-06-14?12:55??lex\lex詞法分析\Debug\vc60.pdb
?????文件?????????176??2011-06-14?20:37??lex\lex詞法分析\input.txt
?????文件????????4301??2010-04-02?19:43??lex\lex詞法分析\lex.dsp
?????文件?????????531??2010-04-02?18:50??lex\lex詞法分析\lex.dsw
?????文件??????204858??2010-04-04?18:37??lex\lex詞法分析\lex.exe
?????文件????????1050??2011-06-14?20:38??lex\lex詞法分析\lex.l
?????文件???????50176??2011-06-14?20:44??lex\lex詞法分析\lex.ncb
?????文件???????48640??2011-06-14?20:44??lex\lex詞法分析\lex.opt
?????文件?????????240??2011-06-14?20:38??lex\lex詞法分析\lex.plg
?????文件???????40834??2010-04-04?18:36??lex\lex詞法分析\lex.yy.c
?????文件????????3476??2011-06-14?12:56??lex\lex詞法分析\lex.yy.dsp
?????文件?????????520??2011-06-14?12:56??lex\lex詞法分析\lex.yy.dsw
?????文件???????41984??2011-06-14?12:56??lex\lex詞法分析\lex.yy.ncb
?????文件???????48640??2011-06-14?12:56??lex\lex詞法分析\lex.yy.opt
?????文件????????1076??2011-06-14?12:55??lex\lex詞法分析\lex.yy.plg
?????文件?????????574??2014-01-17?12:59??lex\lex詞法分析\output.txt
?????文件?????????162??2011-06-15?01:08??lex\lex詞法分析\~$實驗二?報告.doc
?????文件???????50672??2014-01-17?13:23??lex\報告.docx
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