How to use pycparserext - 10 common examples

def test_no_added_attr():
    src = """
    char* foo() {
        return "";
    }

    int main() {
        return 0;
    }
    """
    import pycparserext.ext_c_parser as ext_c_parser
    import pycparserext.ext_c_generator as ext_c_generator

    parser = ext_c_parser.GnuCParser()
    ast = parser.parse(src)
    gen = ext_c_generator.GnuCGenerator()
    print(gen.visit(ast))
    assert "attr" not in gen.visit(ast)

def visit_FuncDeclExt(self, node):
            visits['FuncDeclExt'][0] += 1
            NodeVisitor.generic_visit(self, node)

    src_gnu = """
    int func1(int a, int b) {
        __typeof__(a) _a = __builtin_types_compatible_p(long char, short int);
        __typeof__ (__typeof__ (char *)[4]) y;
        asm("rdtsc" : "=A" (val));
        __attribute__((unused)) static int c;
    }
    """
    import pycparserext.ext_c_parser as ext_c_parser

    parser = ext_c_parser.GnuCParser()
    ast = parser.parse(src_gnu)
    ast.show()
    TestVisitor().visit(ast)
    for visit_type, visit_num in visits.items():
        assert_msg = '{}: Should have visited {}, got {}'.format(
            visit_type, visit_num[1], visit_num[0])
        assert visit_num[0] == visit_num[1], assert_msg

def test_lvalue_gnu_statement_expression():
    src = """
      int func(int a) {
        int ret=(int)({; ; *(int*)&a;});
        return ret;
     }
    """

    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))

def test_funky_header_code_2():
    src = """
        extern __inline int __attribute__ ((__nothrow__)) __signbitf (float __x)
         {
           int __m;
           if (__x == 0)
              __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
           else
              __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
           return __m & 0x8;
         }
        """

    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))

def test_double_pointer():
    src = """
    typedef struct Error {
        int dummy;
    } Error;

    void func_with_p2pp(const char *, Error **);
    """
    import pycparserext.ext_c_parser as ext_c_parser
    import pycparserext.ext_c_generator as ext_c_generator

    parser = ext_c_parser.GnuCParser()
    ast = parser.parse(src)
    gen = ext_c_generator.GnuCGenerator()
    ast.show()
    assert gen.visit(ast).find("func_with_p2pp(const char *, Error **)") != -1

def test_asm_volatile_1():
    src = """
    void read_tsc(void) {
        long val;
        asm("rdtsc" : "=A" (val));
    }    """
    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))

def test_funky_header_code_5():
    src = """ void  do_foo(void) __asm(__STRING(do_foo));"""

    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))

int __m;
           if (__x == 0)
              __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
           else
              __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
           return __m & 0x8;
         }
        """

    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))

def test_no_added_attr():
    src = """
    char* foo() {
        return "";
    }

    int main() {
        return 0;
    }
    """
    import pycparserext.ext_c_parser as ext_c_parser
    import pycparserext.ext_c_generator as ext_c_generator

    parser = ext_c_parser.GnuCParser()
    ast = parser.parse(src)
    gen = ext_c_generator.GnuCGenerator()
    print(gen.visit(ast))
    assert "attr" not in gen.visit(ast)

def test_array_ptr_decl_attribute():
    src = """
    int* __attribute__((weak)) array[256];
    """
    from pycparserext.ext_c_parser import GnuCParser
    p = GnuCParser()
    ast = p.parse(src)
    ast.show()

    from pycparserext.ext_c_generator import GnuCGenerator
    print(GnuCGenerator().visit(ast))