From dfa3a285c140f57dfa08f4465ab1432853e92551 Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <doxygen@gmail.com>
Date: Thu, 18 Feb 2021 21:15:21 +0100
Subject: Refactoring: replace QRegExp by std::regex in vhdlcode.l

---
 src/util.cpp   | 39 +++++++++++++++++++++++++++++++++++++++
 src/util.h     |  5 +++++
 src/vhdlcode.l | 35 ++++++++++++++++++++---------------
 3 files changed, 64 insertions(+), 15 deletions(-)

diff --git a/src/util.cpp b/src/util.cpp
index e8fcab9..36866dd 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -7485,3 +7485,42 @@ QCString removeEmptyLines(const QCString &s)
   //printf("removeEmptyLines(%s)=%s\n",s.data(),out.data());
   return out.data();
 }
+
+/// split input string \a s by string delimiter \a delimiter.
+/// returns a vector of non-empty strings that are between the delimiters
+StringVector split(const std::string &s,const std::string &delimiter)
+{
+  StringVector result;
+  size_t prev = 0, pos = 0, len = s.length();
+  do
+  {
+    pos = s.find(delimiter, prev);
+    if (pos == std::string::npos) pos = len;
+    if (pos>prev) result.push_back(s.substr(prev,pos-prev));
+    prev = pos + delimiter.length();
+  }
+  while (pos<len && prev<len);
+  return result;
+}
+
+/// split input string \a s by regular expression delimiter \a delimiter.
+/// returns a vector of non-empty strings that are between the delimiters
+StringVector split(const std::string &s,const std::regex &delimiter)
+{
+  StringVector result;
+  std::sregex_token_iterator iter(s.begin(), s.end(), delimiter, -1);
+  std::sregex_token_iterator end;
+  for ( ; iter != end; ++iter)
+  {
+    result.push_back(*iter);
+  }
+  return result;
+}
+
+/// find the index of a string in a vector of strings, returns -1 if the string could not be found
+int findIndex(StringVector &sv,const std::string &s)
+{
+  auto it = std::find(sv.begin(),sv.end(),s);
+  return it!=sv.end() ? (int)(it-sv.begin()) : -1;
+}
+
diff --git a/src/util.h b/src/util.h
index 410a3ea..f7f6171 100644
--- a/src/util.h
+++ b/src/util.h
@@ -26,6 +26,7 @@
 #include <unordered_map>
 #include <algorithm>
 #include <functional>
+#include <regex>
 
 #include <ctype.h>
 #include "types.h"
@@ -458,6 +459,10 @@ bool openOutputFile(const char *outFile,QFile &f);
 void writeExtraLatexPackages(FTextStream &t);
 void writeLatexSpecialFormulaChars(FTextStream &t);
 
+StringVector split(const std::string &s,const std::string &delimiter);
+StringVector split(const std::string &s,const std::regex &delimiter);
+int findIndex(StringVector &sv,const std::string &s);
+
 bool recognizeFixedForm(const char* contents, FortranFormat format);
 FortranFormat convertFileNameFortranParserCode(QCString fn);
 
diff --git a/src/vhdlcode.l b/src/vhdlcode.l
index 59872f3..37cc720 100644
--- a/src/vhdlcode.l
+++ b/src/vhdlcode.l
@@ -30,6 +30,7 @@
 
 #include <unordered_set>
 #include <string>
+#include <regex>
 
 /*
  *        includes
@@ -37,7 +38,6 @@
 #include <stdio.h>
 #include <assert.h>
 #include <ctype.h>
-#include <qregexp.h>
 #include <qdir.h>
 #include <qcstringlist.h>
 
@@ -226,9 +226,8 @@ XILINX      "INST"|"NET"|"PIN"|"BLKNM"|"BUFG"|"COLLAPSE"|"CPLD"|"COMPGRP"|"CONFI
 <Map>[^()\n,--]*                    { /* write and link a port map lines */
                                       QCString tt(yytext);
                                       VhdlDocGen::deleteAllChars(tt,',');
-                                      QRegExp r("=>");
-                                      QCStringList ql=QCStringList::split(r,tt);
-                                      if (ql.count()>=2)
+                                      auto ql = split(tt.str(),"=>");
+                                      if (ql.size()>=2)
                                       {
                                         unsigned int index=0;
                                         QCString t1=ql[0];
@@ -355,17 +354,17 @@ XILINX      "INST"|"NET"|"PIN"|"BLKNM"|"BUFG"|"COLLAPSE"|"CPLD"|"COMPGRP"|"CONFI
                                     }
 
 <ParseType>{ENDEFUNC}               {
-                                      QRegExp regg("[\\s]");
                                       QCString tt(yytext);
                                       codifyLines(yyscanner,yytext,yyextra->currClass.data());
                                       tt=tt.lower();
                                       VhdlDocGen::deleteAllChars(tt,';');
                                       tt.stripWhiteSpace();
-                                      QCStringList ql=QCStringList::split(regg,tt);
-                                      int index=ql.findIndex(QCString("if"))+1;
-                                      index+=ql.findIndex(QCString("case"))+1;
-                                      index+=ql.findIndex(QCString("loop"))+1;
-                                      index+=ql.findIndex(QCString("generate"))+1;
+                                      static std::regex regg("[[:space:]]+");
+                                      auto ql = split(tt.str(),regg);
+                                      int index=findIndex(ql,"if")+1;
+                                      index+=findIndex(ql,"case")+1;
+                                      index+=findIndex(ql,"loop")+1;
+                                      index+=findIndex(ql,"generate")+1;
                                       if (index==0)
                                       {
                                         BEGIN(Bases);
@@ -955,18 +954,18 @@ static bool checkVhdlString(yyscan_t yyscanner,QCString &name)
 {
   struct yyguts_t *yyg = (struct yyguts_t*)yyscanner;
   if (name.isEmpty()) return false;
-  static QRegExp regg("[\\s\"]");
 
   int len=name.length();
   if (name.at(0)=='"' && name.at(len-1)=='"' && len > 2)
   {
-    QCStringList qrl=QCStringList::split(regg,name);
+    std::string inside = name.str().substr(1,len-2);
+    static std::regex regg("[[:space:]]+");
+    auto qrl=split(inside,regg);
     if (VhdlDocGen::isNumber(qrl[0]))
     {
       yyextra->code->codify("\"");
       startFontClass(yyscanner,"vhdllogic");
-      QCString mid=name.mid(1,len-2); //" 1223 "
-      yyextra->code->codify(mid.data());
+      yyextra->code->codify(inside.c_str());
       endFontClass(yyscanner);
       yyextra->code->codify("\"");
     }
@@ -1329,7 +1328,13 @@ static void generateClassOrGlobalLink(yyscan_t yyscanner,CodeOutputInterface &ol
   cd = getClass(className.data());
   if (!cd && curr_class)
   {
-     if (QCString(curr_class).contains(QRegExp("::"+QCString(clName)+"$"))) cd = getClass(curr_class);
+    QCString cls = curr_class;
+    QCString suffix = "::";
+    suffix+=clName;
+    if (cls.right(suffix.length())==suffix)
+    {
+      cd = getClass(curr_class);
+    }
   }
 
   while (cd)
-- 
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