add support to format input json as typescript function str

Author: tybalex

examples/server/utils.hpp

@@ -339,7 +339,7 @@ static json probs_vector_to_json(const llama_context * ctx, const std::vector<co
 //
 
 
-static std::string rubra_format_function_call_str(const std::vector<json> & functions, json & tool_name_map) {
+static std::string rubra_format_python_function_call_str(const std::vector<json> & functions, json & tool_name_map) {
     std::string final_str = "You have access to the following tools:\n";
     printf("rubra_format_function_call_str parsing...\n");
     json type_mapping = {
@@ -432,6 +432,104 @@ static std::string rubra_format_function_call_str(const std::vector<json> & func
     return final_str;
 }
 
+
+// Helper function to join strings with a delimiter
+static std::string helper_join(const std::vector<std::string>& elements, const std::string& delimiter) {
+    std::string result;
+    for (auto it = elements.begin(); it != elements.end(); ++it) {
+        if (!result.empty()) {
+            result += delimiter;
+        }
+        result += *it;
+    }
+    return result;
+}
+
+static std::string rubra_format_typescript_function_call_str(const std::vector<json> &functions, json &tool_name_map) {
+    std::string final_str = "You have access to the following tools:\n";
+    json type_mapping = {
+        {"string", "string"},
+        {"integer", "number"},
+        {"number", "number"},
+        {"float", "number"},
+        {"object", "any"},
+        {"array", "any[]"},
+        {"boolean", "boolean"},
+        {"null", "null"}
+    };
+
+    std::vector<std::string> function_definitions;
+    for (const auto &function : functions) {
+        const auto &spec = function.contains("function") ? function["function"] : function;
+        std::string func_name = spec.value("name", "");
+        if (func_name.find('-') != std::string::npos) {
+            const std::string origin_func_name = func_name;
+            std::replace(func_name.begin(), func_name.end(), '-', '_'); // replace "-" with "_" because - is invalid in typescript func name
+            tool_name_map[func_name] = origin_func_name;
+        }
+
+        const std::string description = spec.contains("description") ? spec["description"].get<std::string>() : "";
+        const auto& parameters = spec.contains("parameters") ? spec["parameters"].value("properties", json({})) : json({});
+        const auto& required_params = spec.contains("parameters") ? spec["parameters"].value("required", std::vector<std::string>()) : std::vector<std::string>();
+
+        std::vector<std::string> func_args;
+        std::string docstring = "/**\n * " + description + "\n";
+
+        for (auto it = parameters.begin(); it != parameters.end(); ++it) {
+            const std::string param = it.key();
+            const json& details = it.value();
+            std::string json_type = details["type"].get<std::string>();
+            std::string ts_type = type_mapping.value(json_type, "any");
+            std::string param_description = "";
+            if (details.count("description") > 0) {
+                param_description = details["description"]; // Assuming the description is the first element
+            }
+            if (details.count("enum") > 0) {
+                std::string enum_values;
+                for (const std::string val : details["enum"]) {
+                    if (!enum_values.empty()) {
+                        enum_values += " or ";
+                    }
+                    enum_values = enum_values+ "\"" + val + "\"";
+                }
+                if (details["enum"].size() == 1) {
+                    param_description += " Only Acceptable value is: " + enum_values;
+                } else {
+                    param_description += " Only Acceptable values are: " + enum_values;
+                }
+            }
+            if (param_description.empty()) {
+                param_description = "No description provided.";
+            }
+            if (details.contains("enum")) {
+                ts_type = "string"; // Enum is treated as string in typescript
+            }
+            std::string arg_str = param + ": " + ts_type;
+            if (find(required_params.begin(), required_params.end(), param) == required_params.end()) {
+                arg_str = param + "?: " + ts_type;
+                docstring += " * @param " + param + " - " + param_description + "\n";
+            } else {
+                docstring += " * @param " + param + " - " + param_description + "\n";
+            }
+            func_args.push_back(arg_str);
+        }
+        docstring += " */\n";
+
+        std::string func_args_str = helper_join(func_args, ", ");
+        std::string function_definition = docstring + "function " + func_name + "(" + func_args_str + "): any {}";
+
+        function_definitions.push_back(function_definition);
+    }
+
+    for (const auto& def : function_definitions) {
+        final_str += def + "\n\n";
+    }
+    final_str += "Use the following format if using tools:\n<<functions>>[toolname1(arg1=value1, arg2=value2, ...), toolname2(arg1=value1, arg2=value2, ...)]";
+    return final_str;
+}
+
+
+
 static std::string default_tool_formatter(const std::vector<json>& tools) {
     std::string toolText = "";
     std::vector<std::string> toolNames;
@@ -493,12 +591,12 @@ static json oaicompat_completion_params_parse(
 
     if (body.contains("tools") && !body["tools"].empty()) {
         // function_str = default_tool_formatter(body["tool"]);
-        function_str = rubra_format_function_call_str(body["tools"], tool_name_map);
+        function_str = rubra_format_typescript_function_call_str(body["tools"], tool_name_map);
     }
     // If 'tool' is not set or empty, check 'functions'
     else if (body.contains("functions") && !body["functions"].empty()) {
     //    function_str = default_tool_formatter(body["functions"]);
-       function_str = rubra_format_function_call_str(body["functions"], tool_name_map);
+       function_str = rubra_format_typescript_function_call_str(body["functions"], tool_name_map);
     }
     printf("\n=============Formatting Input from OPENAI format...============\n");
     if (function_str != "") {