pre.cpp

doxygen(一个自动从源代码生成文档的工具)的源代码

#include "defargs.h"
#include "debug.h"
#include "bufstr.h"

#if defined(_MSC_VER) || defined(__BORLANDC__)
#define popen _popen
#define pclose _pclose
#endif

#define YY_NEVER_INTERACTIVE 1
  

struct FileState
{
  int lineNr;
  FILE *filePtr;
  YY_BUFFER_STATE bufState;
  QCString fileName;
};  

/* -----------------------------------------------------------------
 *
 *	scanner's state
 */

static int                g_yyLineNr   = 1;
static QCString           g_yyFileName;
static FileDef           *g_yyFileDef;
static int                g_ifcount    = 0;
static QStrList          *g_pathList = 0;  
static QStack<FileState>  g_includeStack;
static QDict<int>        *g_argDict;
static int                g_defArgs = -1;
static QCString           g_defName;
static QCString           g_defText;
static QCString           g_defLitText;
static QCString           g_defArgsStr;
static bool               g_defVarArgs;
static int                g_level;
static int                g_lastCContext;
static int                g_lastCPPContext;
static QArray<int>        g_levelGuard;
static BufStr            *g_outputBuf;
static int                g_roundCount;
static bool               g_quoteArg;
static DefineDict        *g_fileDefineDict;
static DefineDict        *g_expandedDict;
static int                g_findDefArgContext;
static QCString           g_lastGuardName;
static QCString           g_incName;
static QCString           g_guardExpr;
static int                g_curlyCount;
static bool               g_nospaces; // add extra spaces during macro expansion

static bool               g_macroExpansion; // from the configuration
static bool               g_expandOnlyPredef; // from the configuration


static void setFileName(const char *name)
{
  bool ambig;
  g_yyFileName=name;
  g_yyFileDef=findFileDef(Doxygen::inputNameDict,g_yyFileName,ambig);
}

static void incrLevel()
{
  g_level++;
  g_levelGuard.resize(g_level);
  g_levelGuard[g_level-1]=FALSE;
  //printf("%s line %d: incrLevel %d\n",g_yyFileName.data(),g_yyLineNr,g_level);
}

static void decrLevel()
{
  //printf("%s line %d: decrLevel %d\n",g_yyFileName.data(),g_yyLineNr,g_level);
  if (g_level > 0)
  {
    g_level--;
    g_levelGuard.resize(g_level);
  }
  else
  {
    err("%s:%d: Error: More #endif's than #if's found.\n",
	g_yyFileName.data(),g_yyLineNr);
  }
}

static bool otherCaseDone()
{
  if (g_level==0)
  {
    err("%s:%d: Error: Found an #else without a preceding #if.\n",
	g_yyFileName.data(),g_yyLineNr);
    return TRUE;
  }
  else
  {
    return g_levelGuard[g_level-1];
  }
}

static void setCaseDone(bool value)
{
  g_levelGuard[g_level-1]=value;
}

static Define *isDefined(const char *name)
{
  if (name)
  {
    Define *def;
    //if ((def=fileDefineCache->findDefine(g_yyFileName,name)) && !def->undef) 
    //	return def;
    if ((def=g_fileDefineDict->find(name)) && !def->undef) return def; 
  }
  return 0;
}

static FILE *checkAndOpenFile(const QCString &absName)
{
  FILE *f = 0;
  QFileInfo fi(absName);
  if (fi.exists() && fi.isFile())
  {
    if (!Config_getString("INPUT_FILTER").isEmpty())
    {
      QCString cmd = Config_getString("INPUT_FILTER")+" "+absName;
      f=popen(cmd,"r");
      if (!f) err("Error: could not execute filter %s\n",cmd.data());
    }
    else
    {
      f=fopen(absName,"r");
      if (!f) err("Error: could not open file %s for reading\n",absName.data());
    }
  }
  return f;
}

static FILE *findFile(const char *fileName,bool localInclude)
{
  if (localInclude && g_yyFileDef)
  {
    QCString absName = g_yyFileDef->getPath()+"/"+fileName;
    FILE *f = checkAndOpenFile(absName);
    if (f)
    {
      setFileName(absName);
      g_yyLineNr=1;
      return f;
    }
  }
  if (g_pathList==0) 
  {
    return 0;
  }
  char *s=g_pathList->first();
  while (s)
  {
    QCString absName = (QCString)s+"/"+fileName;
    FILE *f = checkAndOpenFile(absName);
    if (f)
    {
      setFileName(absName);
      g_yyLineNr=1;
      return f;
    }

    s=g_pathList->next();
  } 
  return 0;
}


static int getNextChar(const QCString &expr,QCString *rest,uint &pos);
static int getCurrentChar(const QCString &expr,QCString *rest,uint pos);
static void unputChar(const QCString &expr,QCString *rest,uint &pos,char c);
static void expandExpression(QCString &expr,QCString *rest,int pos);

static QCString stringize(const QCString &s)
{
  QCString result;
  uint i=0;
  bool inString=FALSE;
  bool inChar=FALSE;
  char c,pc;
  while (i<s.length())
  {
    if (!inString && !inChar)
    {
      while (i<s.length() && !inString && !inChar)
      {
	c=s.at(i++);
	if (c=='"')
	{
	  result+="\\\"";
	  inString=TRUE;
	}
	else if (c=='\'')
	{
	  result+=c;
	  inChar=TRUE;
	}
	else
	{
	  result+=c;
	}
      }
    }
    else if (inChar)
    {
      while (i<s.length() && inChar)
      {
	c=s.at(i++);
	if (c=='\'')
	{
	  result+='\'';
	  inChar=FALSE;
	}
	else if (c=='\\')
	{
	  result+="\\\\";
	}
	else
	{
	  result+=c;
	}
      }
    }
    else
    {
      pc=0;
      while (i<s.length() && inString)
      {
	char c=s.at(i++);
	if (c=='"') 
	{
	  result+="\\\"";
	  inString= pc=='\\';
	}
	else if (c=='\\')
	  result+="\\\\";
	else
	  result+=c;
	pc=c;
      }
    }
  }
  //printf("stringize `%s'->`%s'\n",s.data(),result.data());
  return result;
}

/*! Execute all ## operators in expr. 
 * If the macro name before or after the operator contains a no-rescan 
 * marker (@-) then this is removed (before the concatenated macro name
 * may be expanded again.
 */
static void processConcatOperators(QCString &expr)
{
  //printf("processConcatOperators: in=`%s'\n",expr.data());
  QRegExp r("[ \\t\\n]*##[ \\t\\n]*"); 
  int l,n,i=0;
  if (expr.isEmpty()) return;
  while ((n=r.match(expr,i,&l))!=-1)
  {
    //printf("Match: `%s'\n",expr.data()+i);
    if (n+l+1<(int)expr.length() && expr.at(n+l)=='@' && expr.at(n+l+1)=='-')
    {
      // remove no-rescan marker after ID
      l+=2;
    }
    //printf("found `%s'\n",expr.mid(n,l).data());
    // remove the ## operator and the surrounding whitespace
    expr=expr.left(n)+expr.right(expr.length()-n-l);
    int k=n-1;
    while (k>=0 && isId(expr.at(k))) k--; 
    if (k>0 && expr.at(k)=='-' && expr.at(k-1)=='@')
    {
      // remove no-rescan marker before ID
      expr=expr.left(k-1)+expr.right(expr.length()-k-1);
      n-=2;
    }
    i=n;
  }
  //printf("processConcatOperators: out=`%s'\n",expr.data());
}

/*! replaces the function macro \a def whose argument list starts at
 * \a pos in expression \a expr. 
 * Notice that this routine may scan beyond the \a expr string if needed.
 * In that case the characters will be read from the input file.
 * The replacement string will be returned in \a result and the 
 * length of the (unexpanded) argument list is stored in \a len.
 */ 
static bool replaceFunctionMacro(const QCString &expr,QCString *rest,int pos,int &len,const Define *def,QCString &result)
{
  //printf("replaceFunctionMacro(expr=%s,rest=%s,pos=%d,def=%s) level=%d\n",expr.data(),rest ? rest->data() : 0,pos,def->name.data(),g_level);
  uint j=pos;
  len=0;
  result.resize(0);
  int cc;
  while ((cc=getCurrentChar(expr,rest,j))!=EOF && cc==' ') 
  { 
    len++; 
    getNextChar(expr,rest,j); 
  }
  if (cc!='(') 
  { 
    unputChar(expr,rest,j,' '); 
    return FALSE; 
  }
  getNextChar(expr,rest,j); // eat the `(' character

  QDict<QCString> argTable;  // list of arguments
  argTable.setAutoDelete(TRUE);
  QCString arg;
  int argCount=0;
  bool done=FALSE;
  
  // PHASE 1: read the macro arguments
  if (def->nargs==0)
  {
    while ((cc=getNextChar(expr,rest,j))!=EOF)
    {
      char c = (char)cc;
      if (c==')') break;
    }
  }
  else
  {
    while (!done && (argCount<def->nargs || def->varArgs) && 
	((cc=getNextChar(expr,rest,j))!=EOF)
	  )
    {
      char c=(char)cc;
      if (c=='(') // argument is a function => search for matching )
      {
	int level=1;
	arg+=c;
	char term='\0';
	while ((cc=getNextChar(expr,rest,j))!=EOF)
	{
	  char c=(char)cc;
	  if (c=='\'' || c=='\"') // skip ('s and )'s inside strings
	  {
	    if (term!='\0') 
	    { 
	      if (c==term && expr.at(j-2)!='\\') term='\0'; 
	    } 
	    else