qlalr: eradicate all Q_FOREACH loops

... by replacing them with C++11 range-for, or, for loops
over .values(), with explicit iterator loops over the result
of equal_range().

Some fixes here and there to get to mark containers const for
iteration, without having to resort to qAsConst(). Didn't work
everywhere.

Change-Id: Ibc0e71d3b208d118f06e16741af47261ef4b9e15
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

src/tools/qlalr/compress.cpp

@@ -166,7 +166,7 @@ void Compress::operator () (int *table, int row_count, int column_count)
 #ifndef QLALR_NO_CHECK_SORTED_TABLE
   int previous_zeros = INT_MAX;
 
-  foreach (UncompressedRow row, sortedTable)
+  for (const UncompressedRow &row : qAsConst(sortedTable))
     {
       int zeros = row.count (0);
 
@@ -178,7 +178,7 @@ void Compress::operator () (int *table, int row_count, int column_count)
 
   index.fill (-999999, row_count);
 
-  foreach (const UncompressedRow &row, sortedTable)
+  for (const UncompressedRow &row : qAsConst(sortedTable))
     {
       int first_token = std::distance (row.begin (), row.beginNonZeros ());
       QVector<int>::iterator pos = info.begin ();
@@ -252,7 +252,7 @@ void Compress::operator () (int *table, int row_count, int column_count)
     }
 
 #if 0
-  foreach (UncompressedRow row, sortedTable)
+  for (const UncompressedRow &row : qAsConst(sortedTable))
     {
       int i = row.index ();
       Q_ASSERT (i < sortedTable.size ());

src/tools/qlalr/cppgenerator.cpp

@@ -159,12 +159,12 @@ void CppGenerator::operator () ()
 
           int r = aut.id (item->rule);
 
-          NameSet lookaheads = aut.lookaheads.value (item);
+          const NameSet lookaheads = aut.lookaheads.value (item);
 
           if (item->rule == grammar.goal)
             accept_state = q;
 
-          foreach (const Name &s, lookaheads)
+          for (const Name &s : lookaheads)
             {
               int &u = ACTION (q, aut.id (s));
 
@@ -448,7 +448,7 @@ void CppGenerator::generateDecl (QTextStream &out)
       << "public:" << endl
       << "  enum VariousConstants {" << endl;
 
-  foreach (Name t, grammar.terminals)
+  for (Name t : qAsConst(grammar.terminals))
     {
       QString name = *t;
       int value = std::distance (grammar.names.begin (), t);
@@ -606,7 +606,7 @@ void CppGenerator::generateImpl (QTextStream &out)
       out << endl << "#ifndef " << prot << endl;
       out << "const int " << grammar.table_name << "::rule_info [] = {";
       idx = 0;
-      for (RulePointer rule = grammar.rules.begin (); rule != grammar.rules.end (); ++rule, ++idx)
+      for (auto rule = grammar.rules.cbegin (); rule != grammar.rules.cend (); ++rule, ++idx)
         {
           out << endl << "  ";
 
@@ -617,7 +617,7 @@ void CppGenerator::generateImpl (QTextStream &out)
 
           out << name_ids.value(rule->lhs);
 
-          foreach (const Name &n, rule->rhs)
+          for (const Name &n : rule->rhs)
             out << ", " << name_ids.value (n);
         }
       out << "};" << endl << endl;

src/tools/qlalr/lalr.cpp

@@ -410,8 +410,10 @@ void Automaton::buildLookbackSets ()
           if (! _M_grammar->isNonTerminal (A))
             continue;
 
-          foreach (const RulePointer &rule, _M_grammar->rule_map.values (A))
+          const auto range = qAsConst(_M_grammar->rule_map).equal_range(A);
+          for (auto it = range.first; it != range.second; ++it)
             {
+              const RulePointer &rule = *it;
               StatePointer q = p;
 
               for (NameList::iterator dot = rule->rhs.begin (); dot != rule->rhs.end (); ++dot)
@@ -603,8 +605,10 @@ void Automaton::buildIncludesDigraph ()
           if (! _M_grammar->isNonTerminal (name))
             continue;
 
-          foreach (const RulePointer &rule, _M_grammar->rule_map.values (name))
+          const auto range = qAsConst(_M_grammar->rule_map).equal_range(name);
+          for (auto it = range.first; it != range.second; ++it)
             {
+              const RulePointer &rule = *it;
               StatePointer p = pp;
 
               for (NameList::iterator A = rule->rhs.begin (); A != rule->rhs.end (); ++A)

src/tools/qlalr/main.cpp

@@ -67,10 +67,8 @@ int main (int argc, char *argv[])
   bool qt_copyright = false;
   QString file_name = 0;
 
-  QStringList args = app.arguments ();
-  args.removeFirst ();
-
-  foreach (const QString &arg, args) {
+  const QStringList args = app.arguments().mid(1);
+  for (const QString &arg : args) {
       if (arg == QLatin1String ("-h") || arg == QLatin1String ("--help"))
         help_me ();
 

src/tools/qlalr/parsetable.cpp

@@ -86,7 +86,8 @@ void ParseTable::operator () (Automaton *aut)
 
           first = false;
 
-          foreach (const Name &la, aut->lookaheads.value (item))
+          const auto lookaheads = aut->lookaheads.value(item);
+          for (const Name &la : lookaheads)
             out << "    " << *la << " reduce using rule " << aut->id (item->rule) << " (" << *item->rule->lhs << ")" << endl;
         }