fix wrong parsing of values containing '='

fixes #5074

modules/core/src/command_line_parser.cpp

@@ -234,25 +234,21 @@ CommandLineParser::CommandLineParser(int argc, const char* const argv[], const S
     jj = 0;
     for (int i = 1; i < argc; i++)
     {
-        String s = String(argv[i]);
+        String s(argv[i]);
+        bool hasSingleDash = s.length() > 1 && s[0] == '-';
 
-        if (s.find('=') != String::npos && s.find('=') < s.length())
+        if (hasSingleDash)
         {
-            std::vector<String> k_v = impl->split_string(s, '=', true);
-            for (int h = 0; h < 2; h++)
-            {
-                if (k_v[0][0] == '-')
-                    k_v[0] = k_v[0].substr(1, k_v[0].length() -1);
+            bool hasDoubleDash = s.length() > 2 && s[1] == '-';
+            String key = s.substr(hasDoubleDash ? 2 : 1);
+            String value = "true";
+            size_t equalsPos = key.find('=');
+
+            if(equalsPos != String::npos) {
+                value = key.substr(equalsPos + 1);
+                key = key.substr(0, equalsPos);
             }
-            impl->apply_params(k_v[0], k_v[1]);
-        }
-        else if (s.length() > 2 && s[0] == '-' && s[1] == '-')
-        {
-            impl->apply_params(s.substr(2), "true");
-        }
-        else if (s.length() > 1 && s[0] == '-')
-        {
-            impl->apply_params(s.substr(1), "true");
+            impl->apply_params(key, value);
         }
         else
         {

modules/core/test/test_utils.cpp

@@ -203,4 +203,19 @@ TEST(CommandLineParser, testEmptyStringValue)
     EXPECT_FALSE(parser.check());
 }
 
+TEST(CommandLineParser, positional_regression_5074_equal_sign)
+{
+    static const char * const keys3 =
+            "{ @eq0 |  | }"
+            "{ eq1  |  | }";
+
+    const char* argv[] = {"<bin>", "1=0", "--eq1=1=0"};
+    const int argc = 3;
+    cv::CommandLineParser parser(argc, argv, keys3);
+    EXPECT_EQ("1=0", parser.get<String>("@eq0"));
+    EXPECT_EQ("1=0", parser.get<String>(0));
+    EXPECT_EQ("1=0", parser.get<String>("eq1"));
+    EXPECT_TRUE(parser.check());
+}
+
 } // namespace