UPSTREAM PR #18901: jinja : fix lexing of float literals with sign

common/jinja/lexer.cpp

@@ -259,6 +259,11 @@ lexer_result lexer::tokenize(const std::string & source) {
 
                     // Check for numbers following the unary operator
                     std::string num = consume_while(is_integer);
+                    if (pos < src.size() && src[pos] == '.' && pos + 1 < src.size() && is_integer(src[pos + 1])) {
+                        ++pos; // Consume '.'
+                        std::string frac = consume_while(is_integer);
+                        num += "." + frac;
+                    }
                     std::string value = std::string(1, ch) + num;
                     token::type t = num.empty() ? token::unary_operator : token::numeric_literal;
                     // JJ_DEBUG("consumed unary operator or numeric literal: '%s'", value.c_str());

tests/test-jinja.cpp

@@ -247,6 +247,12 @@ static void test_expressions(testing & t) {
         "Bob"
     );
 
+    test_template(t, "negative float (not dot notation)",
+        "{{ -1.0 }}",
+        json::object(),
+        "-1.0"
+    );
+
     test_template(t, "bracket notation",
         "{{ user['name'] }}",
         {{"user", {{"name", "Bob"}}}},