Function test_template_cpp

tests/test-jinja.cpp:1950–1981

}

static void test_template_cpp(testing & t, const std::string & name, const std::string & tmpl, const json & vars, const std::string & expect) {
    t.test(name, [&tmpl, &vars, &expect](testing & t) {
        jinja::lexer lexer;
        auto lexer_res = lexer.tokenize(tmpl);

        jinja::program ast = jinja::parse_from_tokens(lexer_res);

        jinja::context ctx(tmpl);
        jinja::global_from_json(ctx, vars, true);

        jinja::runtime runtime(ctx);

        try {
            const jinja::value results = runtime.execute(ast);
            auto parts = runtime.gather_string_parts(results);

            std::string rendered;
            for (const auto & part : parts->as_string().parts) {
                rendered += part.val;
            }

            if (!t.assert_true("Template render mismatch", expect == rendered)) {
                t.log("Template: " + json(tmpl).dump());
                t.log("Expected: " + json(expect).dump());
                t.log("Actual  : " + json(rendered).dump());
            }
        } catch (const jinja::not_implemented_exception & e) {
            // TODO @ngxson : remove this when the test framework supports skipping tests
            t.log("Skipped: " + std::string(e.what()));
        }
    });
}

// keep this in-sync with https://github.com/huggingface/transformers/blob/main/src/transformers/utils/chat_template_utils.py
// note: we use SandboxedEnvironment instead of ImmutableSandboxedEnvironment to allow usage of in-place array methods like append() and pop()