/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2015 Daniel Marjamäki and Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "testsuite.h"
#include "tokenize.h"
#include "token.h"
#include "settings.h"
#include "templatesimplifier.h"


class TestSimplifyTemplate : public TestFixture {
public:
    TestSimplifyTemplate() : TestFixture("TestSimplifyTemplate") {
    }

private:

    void run() {
        TEST_CASE(template1);
        TEST_CASE(template2);
        TEST_CASE(template3);
        TEST_CASE(template4);
        TEST_CASE(template5);
        TEST_CASE(template6);
        TEST_CASE(template7);
        TEST_CASE(template8);
        TEST_CASE(template9);
        TEST_CASE(template10);
        TEST_CASE(template11);
        TEST_CASE(template12);
        TEST_CASE(template13);
        TEST_CASE(template14);
        TEST_CASE(template15);
        TEST_CASE(template16);
        TEST_CASE(template17);
        TEST_CASE(template18);
        TEST_CASE(template19);
        TEST_CASE(template20);
        TEST_CASE(template21);
        TEST_CASE(template22);
        TEST_CASE(template23);
        TEST_CASE(template24);  // #2648 - using sizeof in template parameter
        TEST_CASE(template25);  // #2648 - another test for sizeof template parameter
        TEST_CASE(template26);  // #2721 - passing 'char[2]' as template parameter
        TEST_CASE(template27);  // #3350 - removing unused template in macro call
        TEST_CASE(template28);
        TEST_CASE(template29);  // #3449 - don't crash for garbage code
        TEST_CASE(template30);  // #3529 - template < template < ..
        TEST_CASE(template31);  // #4010 - reference type
        TEST_CASE(template32);  // #3818 - mismatching template not handled well
        TEST_CASE(template33);  // #3818,#4544 - inner templates in template instantiation not handled well
        TEST_CASE(template34);  // #3706 - namespace => hang
        TEST_CASE(template35);  // #4074 - A<'x'> a;
        TEST_CASE(template36);  // #4310 - passing unknown template instantiation as template argument
        TEST_CASE(template37);  // #4544 - A<class B> a;
        TEST_CASE(template38);  // #4832 - crash on C++11 right angle brackets
        TEST_CASE(template39);  // #4742 - freeze
        TEST_CASE(template40);  // #5055 - template specialization outside struct
        TEST_CASE(template41);  // #4710 - const in instantiation not handled perfectly
        TEST_CASE(template42);  // #4878 - variadic templates
        TEST_CASE(template43);  // #5097 - assert due to '>>' not treated as end of template instantiation
        TEST_CASE(template44);  // #5297 - TemplateSimplifier::simplifyCalculations not eager enough
        TEST_CASE(template45);  // #5814 - syntax error reported for valid code
        TEST_CASE(template46);  // #5816 - syntax error reported for valid code
        TEST_CASE(template47);  // #6023 - syntax error reported for valid code
        TEST_CASE(template48);  // #6134 - 100% CPU upon invalid code
        TEST_CASE(template49);  // #6237 - template instantiation
        TEST_CASE(template50);  // #4272 - simple partial specialization
        TEST_CASE(template51);  // #6172 - crash upon valid code
        TEST_CASE(template52);  // #6437 - crash upon valid code
        TEST_CASE(template53);  // #4335 - bail out for valid code
        TEST_CASE(template54);  // #6587 - memory corruption upon valid code
        TEST_CASE(template_unhandled);
        TEST_CASE(template_default_parameter);
        TEST_CASE(template_default_type);
        TEST_CASE(template_typename);
        TEST_CASE(template_constructor);    // #3152 - template constructor is removed

        // Test TemplateSimplifier::templateParameters
        TEST_CASE(templateParameters);
        TEST_CASE(templateParameters1);  // #4169 - segmentation fault

        TEST_CASE(templateNamePosition);
    }

    std::string tok(const char code[], bool simplify = true, bool debugwarnings = false, Settings::PlatformType type = Settings::Unspecified) {
        errout.str("");

        Settings settings;
        settings.addEnabled("portability");
        settings.debugwarnings = debugwarnings;
        settings.platform(type);
        Tokenizer tokenizer(&settings, this);

        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp");

        if (simplify)
            tokenizer.simplifyTokenList2();

        return tokenizer.tokens()->stringifyList(0, !simplify);
    }

    std::string tok(const char code[], const char filename[]) {
        errout.str("");

        Settings settings;
        Tokenizer tokenizer(&settings, this);

        std::istringstream istr(code);
        tokenizer.tokenize(istr, filename);
        tokenizer.simplifyTokenList2();

        return tokenizer.tokens()->stringifyList(0, false);
    }

    void template1() {
        const char code[] = "template <classname T> void f(T val) { T a; }\n"
                            "f<int>(10);";

        const char expected[] = "f<int> ( 10 ) ; "
                                "void f<int> ( int val ) { }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template2() {
        const char code[] = "template <classname T> class Fred { T a; };\n"
                            "Fred<int> fred;";

        const char expected[] = "Fred<int> fred ; "
                                "class Fred<int> { int a ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template3() {
        const char code[] = "template <classname T, int sz> class Fred { T data[sz]; };\n"
                            "Fred<float,4> fred;";

        const char expected[] = "Fred<float,4> fred ; "
                                "class Fred<float,4> { float data [ 4 ] ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template4() {
        const char code[] = "template <classname T> class Fred { Fred(); };\n"
                            "Fred<float> fred;";

        const char expected[] = "Fred<float> fred ; "
                                "class Fred<float> { Fred<float> ( ) ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template5() {
        const char code[] = "template <classname T> class Fred { };\n"
                            "template <classname T> Fred<T>::Fred() { }\n"
                            "Fred<float> fred;";

        const char expected[] = "template < classname T > Fred < T > :: Fred ( ) { } " // <- TODO: this should be removed
                                "Fred<float> fred ; "
                                "class Fred<float> { } ; "
                                "Fred<float> :: Fred<float> ( ) { }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template6() {
        const char code[] = "template <classname T> class Fred { };\n"
                            "Fred<float> fred1;\n"
                            "Fred<float> fred2;";

        const char expected[] = "Fred<float> fred1 ; "
                                "Fred<float> fred2 ; "
                                "class Fred<float> { } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template7() {
        // A template class that is not used => no simplification
        {
            const char code[] = "template <class T>\n"
                                "class ABC\n"
                                "{\n"
                                "public:\n"
                                "    typedef ABC<T> m;\n"
                                "};\n";

            const char expected[] = "template < class T > class ABC { public: } ;";

            ASSERT_EQUALS(expected, tok(code));
        }

        {
            const char code[] = "template <typename T> class ABC {\n"
                                "public:\n"
                                "    typedef std::vector<T> type;\n"
                                "};\n"
                                "int main() {\n"
                                "    ABC<int>::type v;\n"
                                "    v.push_back(4);\n"
                                "    return 0;\n"
                                "}\n";

            const char wanted[] = "template < typename T > class ABC { public: } ; "
                                  "int main ( ) { "
                                  "std :: vector < int > v ; "
                                  "v . push_back ( 4 ) ; "
                                  "return 0 ; "
                                  "}";

            const char current[] = "template < typename T > class ABC { public: } ; "
                                   "int main ( ) { "
                                   "ABC < int > :: type v ; "
                                   "v . push_back ( 4 ) ; "
                                   "return 0 ; "
                                   "}";

            TODO_ASSERT_EQUALS(wanted, current, tok(code));
        }

        {
            const char code[] = "template <typename T> class ABC {\n"
                                "public:\n"
                                "    typedef std::vector<T> type;\n"
                                "    void f()\n"
                                "    {\n"
                                "      ABC<int>::type v;\n"
                                "      v.push_back(4);\n"
                                "    }\n"
                                "};\n";

            const char expected[] = "template < typename T > class ABC { "
                                    "public: void f ( ) { "
                                    "ABC < int > :: type v ; "
                                    "v . push_back ( 4 ) ; "
                                    "} "
                                    "} ;";

            ASSERT_EQUALS(expected, tok(code));
        }
    }

    // Template definitions but no usage => no expansion
    void template8() {
        const char code[] = "template<typename T> class A;\n"
                            "template<typename T> class B;\n"
                            "\n"
                            "typedef A<int> x;\n"
                            "typedef B<int> y;\n"
                            "\n"
                            "template<typename T> class A {\n"
                            "    void f() {\n"
                            "        B<T> a = B<T>::g();\n"
                            "        T b = 0;\n"
                            "        if (b)\n"
                            "            b = 0;\n"
                            "    }\n"
                            "};\n"
                            "\n"
                            "template<typename T> inline B<T> h() { return B<T>(); }\n";

        ASSERT_EQUALS("template < typename T > class A ; "
                      "template < typename T > class B ; "
                      "template < typename T > class A { void f ( ) { B < T > a ; a = B < T > :: g ( ) ; T b ; b = 0 ; } } ; "
                      "template < typename T > B < T > h ( ) { return B < T > ( ) ; }", tok(code));

        ASSERT_EQUALS("class A { template < typename T > int foo ( T d ) ; } ;", tok("class A{ template<typename T> int foo(T d);};"));
    }

    void template9() {
        const char code[] = "template < typename T > class A { } ;\n"
                            "\n"
                            "void f ( ) {\n"
                            "    A<int> a ;\n"
                            "}\n"
                            "\n"
                            "template < typename T >\n"
                            "class B {\n"
                            "    void g ( ) {\n"
                            "        A < T > b = A < T > :: h ( ) ;\n"
                            "    }\n"
                            "} ;\n";

        // The expected result..
        const char expected[] = "void f ( ) { A<int> a ; } "
                                "template < typename T > class B { void g ( ) { A<T> b ; b = A<T> :: h ( ) ; } } ; "
                                "class A<int> { } ; class A<T> { } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template10() {
        const char code[] = "template <int ui, typename T> T * foo()\n"
                            "{ return new T[ui]; }\n"
                            "\n"
                            "void f ( )\n"
                            "{\n"
                            "    foo<3,int>();\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void f ( ) "
                                "{"
                                " foo<3,int> ( ) ; "
                                "} "
                                "int * foo<3,int> ( ) { return new int [ 3 ] ; }";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template11() {
        const char code[] = "template <int ui, typename T> T * foo()\n"
                            "{ return new T[ui]; }\n"
                            "\n"
                            "void f ( )\n"
                            "{\n"
                            "    char * p = foo<3,char>();\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void f ( ) "
                                "{"
                                " char * p ; p = foo<3,char> ( ) ; "
                                "} "
                                "char * foo<3,char> ( ) { return new char [ 3 ] ; }";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template12() {
        const char code[] = "template <int x, int y, int z>\n"
                            "class A : public B<x, y, (x - y) ? ((y < z) ? 1 : -1) : 0>\n"
                            "{ };\n"
                            "\n"
                            "void f()\n"
                            "{\n"
                            "    A<12,12,11> a;\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void f ( ) "
                                "{"
                                " A<12,12,11> a ; "
                                "} "
                                "class A<12,12,11> : public B < 12 , 12 , 0 > "
                                "{ } ;";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template13() {
        const char code[] = "class BB {};\n"
                            "\n"
                            "template <class T>\n"
                            "class AA\n"
                            "{\n"
                            "public:\n"
                            "    static AA<T> create(T* newObject);\n"
                            "    static int size();\n"
                            "};\n"
                            "\n"
                            "class CC { public: CC(AA<BB>, int) {} };\n"
                            "\n"
                            "class XX {\n"
                            "    AA<CC> y;\n"
                            "public:\n"
                            "    XX();\n"
                            "};\n"
                            "\n"
                            "XX::XX():\n"
                            "    y(AA<CC>::create(new CC(AA<BB>(), 0)))\n"
                            "    {}\n"
                            "\n"
                            "int yy[AA<CC>::size()];";

        // Just run it and check that there are not assertions.
        tok(code);
    }

    void template14() {
        const char code[] = "template <> void foo<int *>()\n"
                            "{ x(); }\n"
                            "\n"
                            "int main()\n"
                            "{\n"
                            "foo<int*>();\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void foo<int*> ( ) "
                                "{ x ( ) ; } "
                                "int main ( ) "
                                "{ foo<int*> ( ) ; }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template15() {
        const char code[] = "template <unsigned int i> void a()\n"
                            "{\n"
                            "    a<i-1>();\n"
                            "}\n"
                            "\n"
                            "template <> void a<0>()\n"
                            "{ }\n"
                            "\n"
                            "int main()\n"
                            "{\n"
                            "    a<2>();\n"
                            "    return 0;\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void a<0> ( ) { } "
                                "int main ( ) "
                                "{ a<2> ( ) ; return 0 ; } "
                                "void a<2> ( ) { a<1> ( ) ; } "
                                "void a<1> ( ) { a<0> ( ) ; }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template16() {
        const char code[] = "template <unsigned int i> void a()\n"
                            "{ }\n"
                            "\n"
                            "template <unsigned int i> void b()\n"
                            "{ a<i>(); }\n"
                            "\n"
                            "int main()\n"
                            "{\n"
                            "    b<2>();\n"
                            "    return 0;\n"
                            "}\n";

        const char expected[] = "int main ( ) { b<2> ( ) ; return 0 ; } "
                                "void b<2> ( ) { a<2> ( ) ; } "
                                "void a<i> ( ) { } "
                                "void a<2> ( ) { }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template17() {
        const char code[] = "template<class T>\n"
                            "class Fred\n"
                            "{\n"
                            "    template<class T>\n"
                            "    static shared_ptr< Fred<T> > CreateFred()\n"
                            "    {\n"
                            "    }\n"
                            "};\n"
                            "\n"
                            "shared_ptr<int> i;\n";

        // Assert that there is no segmentation fault..
        tok(code);
    }

    void template18() {
        const char code[] = "template <class T> class foo { T a; };\n"
                            "foo<int> *f;";

        const char expected[] = "foo<int> * f ; "
                                "class foo<int> { int a ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template19() {
        const char code[] = "template <typename T> T & foo()\n"
                            "{ static T temp; return temp; }\n"
                            "\n"
                            "void f ( )\n"
                            "{\n"
                            "    char p = foo<char>();\n"
                            "}\n";

        // The expected result..
        const char expected[] = "void f ( ) "
                                "{"
                                " char p ; p = foo<char> ( ) ; "
                                "} "
                                "char & foo<char> ( ) { static char temp ; return temp ; }";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template20() {
        // Ticket #1788 - the destructor implementation is lost
        const char code[] = "template <class T> class A\n"
                            "{\n"
                            "public:\n"
                            "    ~A();\n"
                            "};\n"
                            "\n"
                            "template <class T> A<T>::~A()\n"
                            "{\n"
                            "}\n"
                            "\n"
                            "A<int> a;\n";

        // The expected result..
        const char expected[] = "template < class T > A < T > :: ~ A ( ) { } "  // <- TODO: this should be removed
                                "A<int> a ; "
                                "class A<int> { public: ~ A<int> ( ) ; } ; "
                                "A<int> :: ~ A<int> ( ) { }";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template21() {
        {
            const char code[] = "template <classname T> struct Fred { T a; };\n"
                                "Fred<int> fred;";

            const char expected[] = "Fred<int> fred ; "
                                    "struct Fred<int> { int a ; } ;";

            ASSERT_EQUALS(expected, tok(code));
        }

        {
            const char code[] = "template <classname T, int sz> struct Fred { T data[sz]; };\n"
                                "Fred<float,4> fred;";

            const char expected[] = "Fred<float,4> fred ; "
                                    "struct Fred<float,4> { float data [ 4 ] ; } ;";

            ASSERT_EQUALS(expected, tok(code));
        }

        {
            const char code[] = "template <classname T> struct Fred { Fred(); };\n"
                                "Fred<float> fred;";

            const char expected[] = "Fred<float> fred ; "
                                    "struct Fred<float> { Fred<float> ( ) ; } ;";

            ASSERT_EQUALS(expected, tok(code));
        }

        {
            const char code[] = "template <classname T> struct Fred { };\n"
                                "Fred<float> fred1;\n"
                                "Fred<float> fred2;";

            const char expected[] = "Fred<float> fred1 ; "
                                    "Fred<float> fred2 ; "
                                    "struct Fred<float> { } ;";

            ASSERT_EQUALS(expected, tok(code));
        }
    }

    void template22() {
        const char code[] = "template <classname T> struct Fred { T a; };\n"
                            "Fred<std::string> fred;";

        const char expected[] = "Fred<std::string> fred ; "
                                "struct Fred<std::string> { std :: string a ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template23() {
        const char code[] = "template <classname T> void foo() { }\n"
                            "void bar() {\n"
                            "    std::cout << (foo<double>());\n"
                            "}";

        const char expected[] = "void bar ( ) {"
                                " std :: cout << ( foo<double> ( ) ) ; "
                                "} "
                                "void foo<double> ( ) { }";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template24() {
        // #2648
        const char code[] = "template<int n> struct B\n"
                            "{\n"
                            "  int a[n];\n"
                            "};\n"
                            "\n"
                            "template<int x> class bitset: B<sizeof(int)>\n"
                            "{};\n"
                            "\n"
                            "bitset<1> z;";
        const char expected[] = "bitset<1> z ; "
                                "class bitset<1> : B<4> { } ; "
                                "struct B<4> { int a [ 4 ] ; } ;";
        ASSERT_EQUALS(expected, tok(code));
    }

    void template25() {
        const char code[] = "template<int n> struct B\n"
                            "{\n"
                            "  int a[n];\n"
                            "};\n"
                            "\n"
                            "template<int x> class bitset: B<((sizeof(int)) ? : 1)>\n"
                            "{};\n"
                            "\n"
                            "bitset<1> z;";

        const char actual[] = "template < int n > struct B { int a [ n ] ; } ; "
                              "bitset<1> z ; "
                              "class bitset<1> : B < 4 > { } ;";

        const char expected[] = "bitset<1> z ; "
                                "class bitset<1> : B<4> { } ; "
                                "struct B<4> { int a [ 4 ] ; } ;";

        TODO_ASSERT_EQUALS(expected, actual, tok(code));

    }

    void template26() {
        // #2721
        const char code[] = "template<class T>\n"
                            "class A { public: T x; };\n"
                            "\n"
                            "template<class M>\n"
                            "class C: public A<char[M]> {};\n"
                            "\n"
                            "C<2> a;\n";
        // TODO: expand A also
        ASSERT_EQUALS("template < class T > class A { public: T x ; } ; C<2> a ; class C<2> : public A < char [ 2 ] > { } ;", tok(code));
    }

    void template27() {
        // #3350 - template inside macro call
        const char code[] = "X(template<class T> class Fred);";
        ASSERT_EQUALS("X ( template < class T > class Fred ) ;", tok(code));
    }

    void template28() {
        // #3226 - inner template
        const char code[] = "template<class A, class B> class Fred {};\n"
                            "Fred<int,Fred<int,int> > x;\n";
        ASSERT_EQUALS("Fred<int,Fred<int,int>> x ; class Fred<int,int> { } ; class Fred<int,Fred<int,int>> { } ;", tok(code));
    }

    void template29() {
        // #3449 - garbage code (don't segfault)
        const char code[] = "template<typename T> struct A;\n"
                            "struct B { template<typename T> struct C };\n"
                            "{};";
        ASSERT_EQUALS("template < typename T > struct A ; struct B { template < typename T > struct C } ; { } ;", tok(code));
    }

    void template30() {
        // #3529 - template < template < ..
        const char code[] = "template<template<class> class A, class B> void f(){}";
        ASSERT_EQUALS("template < template < class > class A , class B > void f ( ) { }", tok(code));
    }

    void template31() {
        // #4010 - template reference type
        const char code[] = "template<class T> struct A{}; A<int&> a;";
        ASSERT_EQUALS("A<int&> a ; struct A<int&> { } ;", tok(code));
    }

    void template32() {
        // #3818 - mismatching template not handled well
        const char code[] = "template <class T1, class T2, class T3, class T4 > struct A { };\n"
                            "\n"
                            "template <class T>\n"
                            "struct B\n"
                            "{\n"
                            "    public:\n"
                            "        A < int, Pair<T, int>, int > a;\n"  // mismatching parameters => don't instantiate
                            "};\n"
                            "\n"
                            "B<int> b;\n";
        ASSERT_EQUALS("template < class T1 , class T2 , class T3 , class T4 > struct A { } ; "
                      "B<int> b ; "
                      "struct B<int> { public: A < int , Pair < int , int > , int > a ; } ;", tok(code));
    }

    void template33() {
        {
            // #3818 - inner templates in template instantiation not handled well
            const char code[] = "template<class T> struct A { };\n"
                                "template<class T> struct B { };\n"
                                "template<class T> struct C { A<B<X<T> > > ab; };\n"
                                "C<int> c;";
            ASSERT_EQUALS("C<int> c ; "
                          "struct C<int> { A<B<X<int>>> ab ; } ; "
                          "struct B<X<int>> { } ; "  // <- redundant.. but nevermind
                          "struct A<B<X<T>>> { } ; "  // <- redundant.. but nevermind
                          "struct A<B<X<int>>> { } ;", tok(code));
        }

        {
            // #4544
            const char code[] = "struct A { };\n"
                                "template<class T> struct B { };\n"
                                "template<class T> struct C { };\n"
                                "C< B<A> > c;";
            ASSERT_EQUALS("struct A { } ; "
                          "template < class T > struct B { } ; "  // <- redundant.. but nevermind
                          "C<B<A>> c ; struct C<B<A>> { } ;",
                          tok(code));
        }
    }

    void template34() {
        // #3706 - namespace => hang
        const char code[] = "namespace abc {\n"
                            "template <typename T> struct X { void f(X<T> &x) {} };\n"
                            "}\n"
                            "template <> int X<int>::Y(0);";
        ASSERT_EQUALS("namespace abc { "
                      "template < typename T > struct X { void f ( X < T > & x ) { } } ; "
                      "} "
                      "template < > int X < int > :: Y ( 0 ) ;", tok(code));
    }

    void template35() { // #4074 - "A<'x'> a;" is not recognized as template instantiation
        const char code[] = "template <char c> class A {};\n"
                            "A<'x'> a;";
        ASSERT_EQUALS("A<'x'> a ; class A<'x'> { } ;", tok(code));
    }

    void template36() { // #4310 - Passing unknown template instantiation as template argument
        const char code[] = "template <class T> struct X { T t; };\n"
                            "template <class C> struct Y { Foo < X< Bar<C> > > _foo; };\n" // <- Bar is unknown
                            "Y<int> bar;";
        ASSERT_EQUALS("Y<int> bar ; "
                      "struct Y<int> { Foo < X<Bar<int>> > _foo ; } ; "
                      "struct X<Bar<int>> { Bar < int > t ; } ;",
                      tok(code));
    }

    void template37() { // #4544 - A<class B> a;
        const char code[] = "class A { };\n"
                            "template<class T> class B {};\n"
                            "B<class A> b1;\n"
                            "B<A> b2;";
        ASSERT_EQUALS("class A { } ; B<A> b1 ; B<A> b2 ; class B<A> { } ;",
                      tok(code));
    }

    void template_unhandled() {
        // An unhandled template usage should be simplified..
        ASSERT_EQUALS("x<int> ( ) ;", tok("x<int>();"));
    }

    void template38() { // #4832 - Crash on C++11 right angle brackets
        const char code[] = "template <class T> class A {\n"
                            "  T mT;\n"
                            "public:\n"
                            "  void foo() {}\n"
                            "};\n"
                            "\n"
                            "int main() {\n"
                            "    A<A<BLA>>   gna1;\n"
                            "    A<BLA>      gna2;\n"
                            "}\n";
        tok(code); // Don't crash or freeze
    }

    void template39() { // #4742 - Used to freeze in 1.60
        const char code[] = "template<typename T> struct vector {"
                            "  operator T() const;"
                            "};"
                            "void f() {"
                            "  vector<vector<int>> v;"
                            "  const vector<int> vi = static_cast<vector<int>>(v);"
                            "}";
        tok(code);
    }

    void template40() { // #5055 - false negatives when there is template specialization outside struct
        const char code[] = "struct A {"
                            "  template<typename T> struct X { T t; };"
                            "};"
                            "template<> struct A::X<int> { int *t; };";
        ASSERT_EQUALS("struct A { template < typename T > struct X { T t ; } ; } ;", tok(code));
    }

    void template41() { // #4710 - const in template instantiation not handled perfectly
        const char code1[] = "template<class T> struct X { };\n"
                             "void f(const X<int> x) { }";
        ASSERT_EQUALS("void f ( const X<int> x ) { } struct X<int> { } ;", tok(code1));

        const char code2[] = "template<class T> T f(T t) { return t; }\n"
                             "int x() { return f<int>(123); }";
        ASSERT_EQUALS("int x ( ) { return f<int> ( 123 ) ; } int f<int> ( int t ) { return t ; }", tok(code2));
    }

    void template42() { // #4878 cpcheck aborts in ext-blocks.cpp (clang testcode)
        const char code[] = "template<typename ...Args>\n"
                            "int f0(Args ...args) {\n"
                            "  return ^ {\n"
                            "    return sizeof...(Args);\n"
                            "  }() + ^ {\n"
                            "    return sizeof...(args);\n"
                            "  }();\n"
                            "}";
        ASSERT_THROW(tok(code), InternalError);
    }

    void template43() { // #5097 - Assert due to '>>' in 'B<A<C>>' not being treated as end of template instantation
        const char code[] = "template <typename T> struct C { };"
                            "template <typename T> struct D { static int f() { return C<T>::f(); } };"
                            "template <typename T> inline int f2() { return D<T>::f(); }"
                            "template <typename T> int f1(int x, T *) { int id = f2<T>(); return id; }"
                            "template <> struct C < B < A >> {"
                            "  static int f() {"
                            "    return f1 < B < A >> (0, reinterpret_cast< B<A> *>(E<void *>::Int(-1)));"
                            "  }"
                            "};";
        tok(code); // Don't assert
    }

    void template44() { // #5297
        tok("template<class T> struct StackContainer {"
            "  void foo(int i) {"
            "    if (0 >= 1 && i<0) {}"
            "  }"
            "};"
            "template<class T> class ZContainer : public StackContainer<T> {};"
            "struct FGSTensor {};"
            "class FoldedZContainer : public ZContainer<FGSTensor> {};");
    }

    void template45() { // #5814
        tok("namespace Constants { const int fourtytwo = 42; } "
            "template <class T, int U> struct TypeMath { "
            "  static const int mult = sizeof(T) * U; "
            "}; "
            "template <class T> struct FOO { "
            "  enum { value = TypeMath<T, Constants::fourtytwo>::something }; "
            "};");
        ASSERT_EQUALS("", errout.str());
    }

    void template46() { // #5816
        tok("template<class T, class U> struct A { static const int value = 0; }; "
            "template <class T> struct B { "
            "  enum { value = A<typename T::type, int>::value }; "
            "};");
        ASSERT_EQUALS("", errout.str());
        tok("template <class T, class U> struct A {}; "
            "enum { e = sizeof(A<int, int>) }; "
            "template <class T, class U> struct B {};");
        ASSERT_EQUALS("", errout.str());
        tok("template<class T, class U> struct A { static const int value = 0; }; "
            "template<class T> struct B { typedef int type; }; "
            "template <class T> struct C { "
            "  enum { value = A<typename B<T>::type, int>::value }; "
            "};");
        ASSERT_EQUALS("", errout.str());
    }

    void template47() { // #6023
        tok("template <typename T1, typename T2 = T3<T1> > class C1 {}; "
            "class C2 : public C1<C2> {};");
        ASSERT_EQUALS("", errout.str());
    }

    void template48() { // #6134
        tok("template <int> int f( {  } ); "
            "int foo = f<1>(0);");
        ASSERT_EQUALS("", errout.str());
    }

    void template49() { // #6237
        const char code[] = "template <classname T> class Fred { void f(); void g(); };\n"
                            "template <classname T> void Fred<T>::f() { }\n"
                            "template <classname T> void Fred<T>::g() { }\n"
                            "template void Fred<float>::f();\n"
                            "template void Fred<int>::g();\n";

        const char expected[] = "template < classname T > void Fred<T> :: f ( ) { } "
                                "template < classname T > void Fred<T> :: g ( ) { } "
                                "template void Fred<float> :: f ( ) ; "
                                "template void Fred<int> :: g ( ) ; "
                                "class Fred<T> { void f ( ) ; void g ( ) ; } ; "
                                "Fred<T> :: f ( ) { } "
                                "Fred<T> :: g ( ) { } "
                                "class Fred<float> { void f ( ) ; void g ( ) ; } ; "
                                "class Fred<int> { void f ( ) ; void g ( ) ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template50() { // #4272
        const char code[] = "template <classname T> class Fred { void f(); };\n"
                            "template <classname T> void Fred<T>::f() { }\n"
                            "template<> void Fred<float>::f() { }\n"
                            "template<> void Fred<int>::g() { }\n";

        const char expected[] = "template < classname T > void Fred<T> :: f ( ) { } "
                                "template < > void Fred<float> :: f ( ) { } "
                                "template < > void Fred<int> :: g ( ) { } "
                                "class Fred<T> { void f ( ) ; } ; "
                                "Fred<T> :: f ( ) { } "
                                "class Fred<float> { void f ( ) ; } ; "
                                "class Fred<int> { void f ( ) ; } ;";

        ASSERT_EQUALS(expected, tok(code));
    }

    void template51() { // #6172
        tok("template<int N, int ... M> struct A { "
            "  static void foo() { "
            "    int i = N; "
            "  } "
            "}; "
            "void bar() { "
            "  A<0>::foo(); "
            "}");
    }

    void template52() { // #6437
        tok("template <int value> int sum() { "
            "  return value + sum<value/2>(); "
            "} "
            "template<int x, int y> int calculate_value() { "
            "  return sum<x - y>(); "
            "} "
            "int value = calculate_value<1,1>();");
    }

    void template53() { // #4335
        tok("template<int N> struct Factorial { "
            "  enum { value = N * Factorial<N - 1>::value }; "
            "};"
            "template <> struct Factorial<0> { "
            "  enum { value = 1 }; "
            "};"
            "const int x = Factorial<4>::value;", /*simplify=*/true, /*debugwarnings=*/true);
        ASSERT_EQUALS("", errout.str());
    }

    void template54() { // #6587
        tok("template<typename _Tp> _Tp* fn(); "
            "template <class T> struct A { "
            "  template <class U, class S = decltype(fn<T>())> "
            "  struct B { }; "
            "}; "
            "A<int> a;");
    }

    void template_default_parameter() {
        {
            const char code[] = "template <class T, int n=3>\n"
                                "class A\n"
                                "{ T ar[n]; };\n"
                                "\n"
                                "void f()\n"
                                "{\n"
                                "    A<int,2> a1;\n"
                                "    A<int> a2;\n"
                                "}\n";

            // The expected result..
            const char expected[] = "void f ( ) "
                                    "{"
                                    " A<int,2> a1 ;"
                                    " A<int,3> a2 ; "
                                    "} "
                                    "class A<int,2> "
                                    "{ int ar [ 2 ] ; } ; "
                                    "class A<int,3> "
                                    "{ int ar [ 3 ] ; } ;";
            ASSERT_EQUALS(expected, tok(code));
        }
        {
            const char code[] = "template <class T, int n1=3, int n2=2>\n"
                                "class A\n"
                                "{ T ar[n1+n2]; };\n"
                                "\n"
                                "void f()\n"
                                "{\n"
                                "    A<int> a1;\n"
                                "    A<int,3> a2;\n"
                                "}\n";

            // The expected result..
            const char expected[] = "void f ( ) "
                                    "{"
                                    " A<int,3,2> a1 ;"
                                    " A<int,3,2> a2 ; "
                                    "} "
                                    "class A<int,3,2> "
                                    "{ int ar [ 5 ] ; } ;";
            ASSERT_EQUALS(expected, tok(code));
        }
        {
            const char code[] = "template <class T, int n=3>\n"
                                "class A\n"
                                "{ T ar[n]; };\n"
                                "\n"
                                "void f()\n"
                                "{\n"
                                "    A<int,(int)2> a1;\n"
                                "    A<int> a2;\n"
                                "}\n";

            const char wanted[] = "template < class T , int n >"
                                  " class A"
                                  " { T ar [ n ] ; } ;"
                                  " void f ( )"
                                  " {"
                                  " A<int,(int)2> a1 ;"
                                  " A<int,3> a2 ;"
                                  " }"
                                  " class A<int,2>"
                                  " { int ar [ 2 ] ; }"
                                  " class A<int,3>"
                                  " { int ar [ 3 ] ; }";

            const char current[] = "void f ( ) "
                                   "{ "
                                   "A < int , ( int ) 2 > a1 ; "
                                   "A<int,3> a2 ; "
                                   "} "
                                   "class A<int,3> "
                                   "{ int ar [ 3 ] ; } ;";
            TODO_ASSERT_EQUALS(wanted, current, tok(code));
        }
        {
            const char code[] = "class A { }; "
                                "template<class T> class B { }; "
                                "template<class T1, class T2 = B<T1>> class C { }; "
                                "template<class T1 = A, typename T2 = B<A>> class D { };";
            ASSERT_EQUALS("class A { } ; "
                          "template < class T > class B { } ; "
                          "template < class T1 , class T2 = B < T1 > > class C { } ; "
                          "template < class T1 = A , typename T2 = B < A > > class D { } ;", tok(code));
        }
    }

    void template_default_type() {
        const char code[] = "template <typename T, typename U=T>\n"
                            "class A\n"
                            "{\n"
                            "public:\n"
                            "  void foo() {\n"
                            "    int a;\n"
                            "    a = static_cast<U>(a);\n"
                            "  }\n"
                            "};\n"
                            "\n"
                            "template <typename T>\n"
                            "class B\n"
                            "{\n"
                            "protected:\n"
                            "  A<int> a;\n"
                            "};\n"
                            "\n"
                            "class C\n"
                            "  : public B<int>\n"
                            "{\n"
                            "};\n";

        tok(code);

        //ASSERT_EQUALS("[file1.cpp:15]: (error) Internal error: failed to instantiate template. The checking continues anyway.\n", errout.str());
        ASSERT_EQUALS("", errout.str());
    }

    void template_typename() {
        {
            const char code[] = "template <class T>\n"
                                "void foo(typename T::t *)\n"
                                "{ }";

            // The expected result..
            const char expected[] = "template < class T > void foo ( T :: t * ) { }";
            ASSERT_EQUALS(expected, tok(code));
        }

        {
            const char code[] = "void f() {\n"
                                "    x(sizeof typename);\n"
                                "    type = 0;\n"
                                "}";

            ASSERT_EQUALS("void f ( ) { x ( sizeof ( typename ) ) ; type = 0 ; }", tok(code));
        }
    }

    void template_constructor() {
        // #3152 - if template constructor is removed then there might be
        //         "no constructor" false positives
        const char code[] = "class Fred {\n"
                            "    template<class T> explicit Fred(T t) { }\n"
                            "}";
        ASSERT_EQUALS("class Fred { template < class T > explicit Fred ( T t ) { } }", tok(code));

        // #3532
        const char code2[] = "class Fred {\n"
                             "    template<class T> Fred(T t) { }\n"
                             "}";
        ASSERT_EQUALS("class Fred { template < class T > Fred ( T t ) { } }", tok(code2));
    }

    unsigned int templateParameters(const char code[]) {
        Settings settings;
        Tokenizer tokenizer(&settings, this);

        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp", "", true);

        return TemplateSimplifier::templateParameters(tokenizer.tokens());
    }

    void templateParameters() {
        // Test that the function TemplateSimplifier::templateParameters works
        ASSERT_EQUALS(1U, templateParameters("<struct C> x;"));
        ASSERT_EQUALS(1U, templateParameters("<union C> x;"));
        ASSERT_EQUALS(1U, templateParameters("<const int> x;"));
        ASSERT_EQUALS(1U, templateParameters("<int const *> x;"));
        ASSERT_EQUALS(1U, templateParameters("<const struct C> x;"));
    }

    void templateParameters1() {
        // #4169 - segmentation fault (invalid code)
        const char code[] = "volatile true , test < test < #ifdef __ppc__ true ,";
        // do not crash on invalid code
        ASSERT_EQUALS(0, templateParameters(code));
    }

    // Helper function to unit test TemplateSimplifier::getTemplateNamePosition
    int templateNamePositionHelper(const char code[], unsigned offset = 0) {
        Settings settings;
        Tokenizer tokenizer(&settings, this);

        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp", "", true);

        const Token *tok = tokenizer.tokens();
        for (unsigned i = 0 ; i < offset ; ++i)
            tok = tok->next();
        return TemplateSimplifier::getTemplateNamePosition(tok);
    }

    void templateNamePosition() {
        // Template class
        ASSERT_EQUALS(2, templateNamePositionHelper("template<class T> class A {};", 4));
        ASSERT_EQUALS(2, templateNamePositionHelper("template<class T> struct A {};", 4));
        ASSERT_EQUALS(2, templateNamePositionHelper("template<class T> class A : B {};", 4));
        ASSERT_EQUALS(2, templateNamePositionHelper("template<class T> struct A : B {};", 4));
        // Template function definitions
        ASSERT_EQUALS(2, templateNamePositionHelper("template<class T> unsigned foo() { return 0; }", 4));
        ASSERT_EQUALS(3, templateNamePositionHelper("template<class T> unsigned* foo() { return 0; }", 4));
        ASSERT_EQUALS(3, templateNamePositionHelper("template<class T> const unsigned foo() { return 0; }", 4));
        ASSERT_EQUALS(4, templateNamePositionHelper("template<class T> const unsigned& foo() { return 0; }", 4));
        // Class template members
        ASSERT_EQUALS(4, templateNamePositionHelper("class A { template<class T> unsigned foo(); }; "
                      "template<class T> unsigned A::foo() { return 0; }", 19));
        ASSERT_EQUALS(5, templateNamePositionHelper("class A { template<class T> const unsigned foo(); }; "
                      "template<class T> const unsigned A::foo() { return 0; }", 20));
        TODO_ASSERT_EQUALS(7, -1, templateNamePositionHelper("class A { class B { template<class T> const unsigned foo(); }; } ; "
                           "template<class T> const unsigned A::B::foo() { return 0; }", 25));
        // Template class member
        TODO_ASSERT_EQUALS(7, -1, templateNamePositionHelper("template<class T> class A { unsigned foo(); }; "
                           "template<class T> unsigned A<T>::foo() { return 0; }", 19));
    }
};

REGISTER_TEST(TestSimplifyTemplate)