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下面來分析 flex文件的最后一部份，就是輔助代碼部份，這部份代碼是原封不動地拷貝到生成的文件里。它的代碼如下：

#001?%%

這個雙百分號開始，就表示 flex文件的第三部分開始了。

#002?

#003?LLScriptAllocationManager?*gAllocationManager;

定義分配管理器指針。

#004 ?LLScriptScript ???????????? *gScriptp;

定義腳本的指針。

#005?

#006?// Prototype for the yacc parser entry point

#007?int yyparse(void);

前置聲明 yacc的語法分析的函數。

#008?

#009?int yyerror(const char *fmt, ...)

#010?{

#011? ?? gErrorToText.writeError(yyout, gLine, gColumn, LSERROR_SYNTAX_ERROR);

#012? ?? return 0;

#013?}

分析出錯時輸出錯誤位置。

#014?

#015?//#define EMERGENCY_DEBUG_PRINTOUTS

#016?//#define EMIT_CIL_ASSEMBLER

#017?

下面開始進行腳本編譯處理。

#018?BOOL lscript_compile(const char* src_filename, const char* dst_filename,

#019? ?????????????????? ?const char* err_filename, BOOL is_god_like)

#020?{

#021? ?? BOOL??????????? b_parse_ok = FALSE;

#022? ?? BOOL??????????? b_dummy = FALSE;

#023? ?? U64???????????? b_dummy_count = FALSE;

#024? ?? LSCRIPTType???? type = LST_NULL;

#025?

#026? ?? gInternalColumn = 0;

#027? ?? gInternalLine = 0;

#028? ?? gScriptp = NULL;

#029?

#030? ?? gErrorToText.init();

#031? ?? init_supported_expressions();

#032? ?? init_temp_jumps();

#033? ?? gAllocationManager = new LLScriptAllocationManager();

#034?

下面打開腳本文件。

#035? ?? yyin = LLFile::fopen(src_filename, "r");

#036? ?? if (yyin)

#037? ?? {

打開錯誤輸出文件。

#038? ?????? yyout = LLFile::fopen(err_filename, "w");

#039?

#040? ?????? // Reset the lexer's internal buffering.

#041?

讀入腳本文件。

#042? ?? ????yyrestart(yyin);

#043?

進行語法分析。

#044? ?????? b_parse_ok = !yyparse();

#045?

#046? ?????? if (b_parse_ok)

#047? ?????? {

語法分析成功。

#048?#ifdef EMERGENCY_DEBUG_PRINTOUTS

#049? ?????????? char compiled[256];

#050? ?????????? sprintf(compiled, "%s.o", src_filename);

#051? ?????????? FILE* compfile;

#052? ?????????? compfile = LLFile::fopen(compiled, "w");

#053?#endif

#054?

#055? ?????????? if(dst_filename)

#056? ?????????? {

#057? ?????????????? gScriptp->setBytecodeDest(dst_filename);

#058? ?????????? }

#059?

#060? ?????????? gScriptp->mGodLike = is_god_like;

#061?

#062? ?????????? gScopeStringTable = new LLStringTable(16384);

#063?#ifdef EMERGENCY_DEBUG_PRINTOUTS

下面的代碼遍歷語法樹，生成腳本的中間代碼。

#064? ?????????? gScriptp->recurse(compfile, 0, 4, LSCP_PRETTY_PRINT, LSPRUNE_INVALID, b_dummy, NULL, type, type, b_dummy_count, NULL, NULL,

#065?0, NULL, 0, NULL);

#066?#endif

#067? ?????????? gScriptp->recurse(yyout, 0, 0, LSCP_PRUNE,????? LSPRUNE_INVALID, b_dummy, NULL, type, type, b_dummy_count,

#068?NULL, NULL, 0, NULL, 0, NULL);

#069? ?????????? gScriptp->recurse(yyout, 0, 0, LSCP_SCOPE_PASS1, LSPRUNE_INVALID, b_dummy, NULL, type, type, b_dummy_count, NULL, NULL, 0,

#070?NULL, 0, NULL);

#071? ?????????? gScriptp->recurse(yyout, 0, 0, LSCP_SCOPE_PASS2, LSPRUNE_INVALID, b_dummy, NULL, type, type, b_dummy_count, NULL, NULL, 0,

#072?NULL, 0, NULL);

#073? ?????????? gScriptp->recurse(yyout, 0, 0, LSCP_TYPE,?????? LSPRUNE_INVALID, b_dummy, NULL, type, type, b_dummy_count,

#074?NULL, NULL, 0, NULL, 0, NULL);

#075? ?????????? if (!gErrorToText.getErrors())

#076? ?????????? {

#077? ?????????????? gScriptp->recurse(yyout, 0, 0, LSCP_RESOURCE, LSPRUNE_INVALID,????? b_dummy,

#078?NULL, type, type, b_dummy_count, NULL, NULL, 0, NULL, 0, NULL);

#079?#ifdef EMERGENCY_DEBUG_PRINTOUTS

#080 ? ?????????????? gScriptp->recurse(yyout, 0, 0, LSCP_EMIT_ASSEMBLY, LSPRUNE_INVALID,?b_dummy, NULL, type, type,

#081?b_dummy_count, NULL, NULL, 0, NULL, 0, NULL);

#082?#endif

#083?#ifdef EMIT_CIL_ASSEMBLER

#084? ?????????????? const char* cil_output_file_name = dst_filename? dst_filename : "lscript.cil";

#085? ?????????????? FILE* cilout = LLFile::fopen(cil_output_file_name, "w");

#086? ?????????????? if(NULL == cilout)

#087? ?????????????? {

#088? ?????????????????? fprintf(yyout, "Error opening cil output file %s/n", cil_output_file_name);

#089? ?????????????? }

#090? ?????????????? else

#091? ?????????????? {

#092? ?????????????????? gScriptp->recurse(cilout, 0, 0, LSCP_EMIT_CIL_ASSEMBLY, LSPRUNE_INVALID,?b_dummy, NULL,

#093?type, type, b_dummy_count, NULL, NULL, 0, NULL, 0, NULL);

#094? ?????????????????? if(fclose(cilout) == EOF)

#095? ?????????????????? {

#096? ?????????????????????? fprintf(yyout, "Error closing cil output file %s/n", cil_output_file_name);

#097? ?????????????????? }

#098? ?????????????? }

#099?#endif

#100? ?????????????? gScriptp->recurse(yyout, 0, 0, LSCP_EMIT_BYTE_CODE, LSPRUNE_INVALID, b_dummy, NULL, type, type,

#101?b_dummy_count, NULL, NULL, 0, NULL, 0, NULL);

#102? ?????????? }

#103? ?????????? delete gScopeStringTable;

#104? ?????????? gScopeStringTable = NULL;

#105?#ifdef EMERGENCY_DEBUG_PRINTOUTS

#106? ?????????? fclose(compfile);

#107?#endif

#108? ?????? }

#109? ?????? fclose(yyout);

#110? ?? }

#111?

#112? ?? fclose(yyin);

#113? ?? delete gAllocationManager;

#114? ?? delete gScopeStringTable;

#115? ??

#116? ?? return b_parse_ok && !gErrorToText.getErrors();

#117?}

#118?

#119?

輸入文件名稱的腳本編譯函數。

#120?BOOL lscript_compile(char *filename, BOOL is_god_like = FALSE)

#121?{

生成輸入和輸出文件名稱。

#122? ?? char src_filename[MAX_STRING];

#123? ?? sprintf(src_filename, "%s.lsl", filename);

#124? ?? char err_filename[MAX_STRING];

#125? ?? sprintf(err_filename, "%s.out", filename);

調用前面腳本編譯函數。

#126? ?? return lscript_compile(src_filename, NULL, err_filename, is_god_like);

#127?}

#128?

#129?

下面處理 GCC編譯問題。

#130?S32 yywrap()

#131?{

#132?#if defined(FLEX_SCANNER) && !defined(LL_WINDOWS)

#133? ?? // get gcc to stop complaining about lack of use of yyunput

#134? ?? (void) yyunput;

#135?#endif

#136? ?? return(1);

#137?}

#138?

跳過所有腳本注釋部份。

#139?void comment()

#140?{

#141? ?? char c;

#142?

#143? ?? while ((c = yyinput()) != '/n' && c != 0 && c != EOF)

#144? ?????? ;

#145?}

#146?

統計編譯所在的行號和列號。

#147?void count()

#148?{

#149? ?? S32 i;

#150?

#151? ?? gColumn = gInternalColumn;

#152? ?? gLine = gInternalLine;

#153?

#154? ?? for (i = 0; yytext[i] != '/0'; i++)

#155? ?????? if (yytext[i] == '/n')

#156? ?????? {

#157? ?????????? gInternalLine++;

#158? ?????????? gInternalColumn = 0;

#159? ?????? }

#160? ?????? else if (yytext[i] == '/t')

#161? ?????????? gInternalColumn += 4 - (gInternalColumn % 8);

#162? ?????? else

#163? ?????????? gInternalColumn++;

#164?}

#165?

分析腳本的字符串。

#166?void parse_string()

#167?{

#168? ?? S32 length = (S32)strlen(yytext);

#169? ?? length = length - 2;

#170? ?? char *temp = yytext + 1;

#171?

#172? ?? S32 i;

#173? ?? S32 escapes = 0;

#174? ?? S32 tabs = 0;

#175? ?? for (i = 0; i < length; i++)

#176? ?? {

#177? ?????? if (temp[i] == '//')

#178? ?????? {

#179? ?????????? escapes++;

#180? ?????????? i++;

#181? ?????????? if (temp[i] == 't')

#182? ?????????????? tabs++;

#183? ?????? }

#184? ?? }

#185?

#186? ?? S32 newlength = length - escapes + tabs*3;

#187? ?? yylval.sval = new char[newlength + 1];

#188?

#189? ?? char *dest = yylval.sval;

#190?

#191? ?? for (i = 0; i < length; i++)

#192? ?? {

#193? ?????? if (temp[i] == '//')

#194? ?????? {

#195? ?????????? i++;

#196? ?????????? // linefeed

#197? ?????????? if (temp[i] == 'n')

#198? ?????????? {

#199? ?????? ??????? *dest++ = 10;

#200? ?????????? }

#201? ?????????? else if (temp[i] == 't')

#202? ?????????? {

#203? ?????????????? *dest++ = ' ';

#204? ?????????????? *dest++ = ' ';

#205? ?????????????? *dest++ = ' ';

#206? ?????????????? *dest++ = ' ';

#207? ?????????? }

#208? ?????????? else

#209? ?????????? {

#210? ?????????????? *dest++ = temp[i];

#211? ?????????? }

#212? ?????? }

#213? ?????? else

#214? ?????? {

#215? ?????????? *dest++ = temp[i];

#216? ?????? }

#217? ?? }

#218? ?? yylval.sval[newlength] = 0;

#219?}

#220?

輔助代碼部份主要調用語法分析生成函數來編譯腳本，當然語法分析的函數里又調用詞法分析的函數來獲取所需要的單詞，最后生成腳本的樹中間代碼。

第二人生的源碼分析(105)腳本的詞法分析（3）

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