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jinja : undefined should be treated as sequence/iterable (return string/array) by filters/tests #19147

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Merged
CISC merged 3 commits into from
Jan 28, 2026
Merged

jinja : undefined should be treated as sequence/iterable (return string/array) by filters/tests #19147

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2805d4e
undefined is treated as iterable (string/array) by filters
CISC Jan 27, 2026
22ab7c8
add tests
CISC Jan 27, 2026
69646c1
add sequence and iterable tests
CISC Jan 28, 2026
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90 changes: 86 additions & 4 deletions common/jinja/value.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1003,7 +1003,12 @@ const func_builtins & value_none_t::get_builtins() const {
static const func_builtins builtins = {
{"default", default_value},
{"tojson", tojson},
{"string", [](const func_args &) -> value { return mk_val<value_string>("None"); }}
{"string", [](const func_args &) -> value {
return mk_val<value_string>("None");
}},
{"safe", [](const func_args &) -> value {
return mk_val<value_string>("None");
}},
};
return builtins;
}
Expand All @@ -1012,9 +1017,86 @@ const func_builtins & value_none_t::get_builtins() const {
const func_builtins & value_undefined_t::get_builtins() const {
static const func_builtins builtins = {
{"default", default_value},
{"tojson", [](const func_args & args) -> value {
args.ensure_vals<value_undefined>();
return mk_val<value_string>("null");
{"capitalize", [](const func_args &) -> value {
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return mk_val<value_string>();
}},
{"first", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"items", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"join", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"last", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"length", [](const func_args &) -> value {
return mk_val<value_int>(0);
}},
{"list", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"lower", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"map", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"max", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"min", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"reject", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"rejectattr", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"replace", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"reverse", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"safe", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"select", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"selectattr", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"sort", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"string", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"strip", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"sum", [](const func_args &) -> value {
return mk_val<value_int>(0);
}},
{"title", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"truncate", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"unique", [](const func_args &) -> value {
return mk_val<value_array>();
}},
{"upper", [](const func_args &) -> value {
return mk_val<value_string>();
}},
{"wordcount", [](const func_args &) -> value {
return mk_val<value_int>(0);
}},
};
return builtins;
Expand Down
162 changes: 162 additions & 0 deletions tests/test-jinja.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -329,6 +329,12 @@ static void test_loops(testing & t) {
"empty"
);

test_template(t, "for undefined empty",
"{% for i in items %}{{ i }}{% else %}empty{% endfor %}",
json::object(),
"empty"
);

test_template(t, "nested for",
"{% for i in a %}{% for j in b %}{{ i }}{{ j }}{% endfor %}{% endfor %}",
{{"a", json::array({1, 2})}, {"b", json::array({"x", "y"})}},
Expand Down Expand Up @@ -1122,6 +1128,54 @@ static void test_string_methods(testing & t) {
{{"s", "banana"}},
"bXnXna"
);

test_template(t, "undefined|capitalize",
"{{ arr|capitalize }}",
json::object(),
""
);

test_template(t, "undefined|title",
"{{ arr|title }}",
json::object(),
""
);

test_template(t, "undefined|truncate",
"{{ arr|truncate(9) }}",
json::object(),
""
);

test_template(t, "undefined|upper",
"{{ arr|upper }}",
json::object(),
""
);

test_template(t, "undefined|lower",
"{{ arr|lower }}",
json::object(),
""
);

test_template(t, "undefined|replace",
"{{ arr|replace('a', 'b') }}",
json::object(),
""
);

test_template(t, "undefined|trim",
"{{ arr|trim }}",
json::object(),
""
);

test_template(t, "undefined|wordcount",
"{{ arr|wordcount }}",
json::object(),
"0"
);
}

static void test_array_methods(testing & t) {
Expand Down Expand Up @@ -1289,6 +1343,108 @@ static void test_array_methods(testing & t) {
// {{"arr", json::array({"a", "b", "c"})}},
// "a,x,b,c"
// );

test_template(t, "undefined|select",
"{% for item in items|select('odd') %}{{ item.name }} {% endfor %}",
json::object(),
""
);

test_template(t, "undefined|selectattr",
"{% for item in items|selectattr('active') %}{{ item.name }} {% endfor %}",
json::object(),
""
);

test_template(t, "undefined|reject",
"{% for item in items|reject('even') %}{{ item.name }} {% endfor %}",
json::object(),
""
);

test_template(t, "undefined|rejectattr",
"{% for item in items|rejectattr('active') %}{{ item.name }} {% endfor %}",
json::object(),
""
);

test_template(t, "undefined|list",
"{{ arr|list|string }}",
json::object(),
"[]"
);

test_template(t, "undefined|string",
"{{ arr|string }}",
json::object(),
""
);

test_template(t, "undefined|first",
"{{ arr|first }}",
json::object(),
""
);

test_template(t, "undefined|last",
"{{ arr|last }}",
json::object(),
""
);

test_template(t, "undefined|length",
"{{ arr|length }}",
json::object(),
"0"
);

test_template(t, "undefined|join",
"{{ arr|join }}",
json::object(),
""
);

test_template(t, "undefined|sort",
"{{ arr|sort|string }}",
json::object(),
"[]"
);

test_template(t, "undefined|reverse",
"{{ arr|reverse|join }}",
json::object(),
""
);

test_template(t, "undefined|map",
"{% for v in arr|map(attribute='age') %}{{ v }} {% endfor %}",
json::object(),
""
);

test_template(t, "undefined|min",
"{{ arr|min }}",
json::object(),
""
);

test_template(t, "undefined|max",
"{{ arr|max }}",
json::object(),
""
);

test_template(t, "undefined|unique",
"{{ arr|unique|join }}",
json::object(),
""
);

test_template(t, "undefined|sum",
"{{ arr|sum }}",
json::object(),
"0"
);
}

static void test_object_methods(testing & t) {
Expand Down Expand Up @@ -1393,6 +1549,12 @@ static void test_object_methods(testing & t) {
json::object(),
"True"
);

test_template(t, "undefined|items",
"{{ arr|items|join }}",
json::object(),
""
);
}

static void test_hasher(testing & t) {
Expand Down
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