llmapi/src/types.cppm at main · mcpplibs/llmapi · GitHub

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export module mcpplibs.llmapi:types;

import std;

import mcpplibs.llmapi.nlohmann.json;

namespace mcpplibs::llmapi {

// Roles

export enum class Role { System, User, Assistant, Tool };

// Content blocks (multimodal)

export struct TextContent {

std::string text;

};

export struct ImageContent {

std::string data; // base64 or URL

std::string mediaType; // "image/png", "image/jpeg"

bool isUrl{false};

};

export struct AudioContent {

std::string data; // base64

std::string format; // "wav", "mp3"

};

export struct ToolUseContent {

std::string id;

std::string name;

std::string inputJson;

};

export struct ToolResultContent {

std::string toolUseId;

std::string content;

bool isError{false};

};

export using ContentPart =

std::variant<TextContent, ImageContent, AudioContent, ToolUseContent, ToolResultContent>;

export using Content = std::variant<std::string, std::vector<ContentPart>>;

export struct CacheControl {

std::string type {"ephemeral"};

};

// Message

export struct Message {

Role role;

Content content;

std::string name;

std::optional<CacheControl> cacheControl;

static Message system(std::string_view text) {

return Message{.role = Role::System, .content = std::string{text}};

}

static Message user(std::string_view text) {

return Message{.role = Role::User, .content = std::string{text}};

}

static Message assistant(std::string_view text) {

return Message{.role = Role::Assistant, .content = std::string{text}};

}

};

// Tool definition

export struct ToolDef {

std::string name;

std::string description;

std::string inputSchema; // JSON Schema string

};

// Tool call (from response)

export struct ToolCall {

std::string id;

std::string name;

std::string arguments;

};

// Tool choice

export enum class ToolChoice { Auto, None, Required };

export struct ToolChoiceForced {

std::string name;

};

export using ToolChoicePolicy = std::variant<ToolChoice, ToolChoiceForced>;

// Response format

export enum class ResponseFormatType { Text, JsonObject, JsonSchema };

export struct ResponseFormat {

ResponseFormatType type{ResponseFormatType::Text};

std::string schemaName;

std::string schema;

};

// Chat params

export struct ChatParams {

std::optional<double> temperature;

std::optional<double> topP;

std::optional<int> maxTokens;

std::optional<std::vector<std::string>> stop;

std::optional<std::vector<ToolDef>> tools;

std::optional<ToolChoicePolicy> toolChoice;

std::optional<ResponseFormat> responseFormat;

std::optional<std::string> extraJson;

};

// Stop reason

export enum class StopReason { EndOfTurn, MaxTokens, ToolUse, ContentFilter, StopSequence };

// Usage

export struct Usage {

int inputTokens{0};

int outputTokens{0};

int totalTokens{0};

int cacheCreationTokens{0};

int cacheReadTokens{0};

};

// Chat response

export struct ChatResponse {

std::string id;

std::string model;

std::vector<ContentPart> content;

StopReason stopReason;

Usage usage;

std::string text() const {

std::string result;

for (const auto& part : content) {

if (auto* t = std::get_if<TextContent>(&part)) {

result += t->text;

}

return result;

}

std::vector<ToolCall> tool_calls() const {

std::vector<ToolCall> calls;

for (const auto& part : content) {

if (auto* t = std::get_if<ToolUseContent>(&part)) {

calls.push_back(ToolCall{

.id = t->id,

.name = t->name,

.arguments = t->inputJson,

});

}

return calls;

}

};

// Embedding response

export struct EmbeddingResponse {

std::vector<std::vector<float>> embeddings;

std::string model;

Usage usage;

};

// Conversation container

export struct Conversation {

std::vector<Message> messages;

void push(Message msg) { messages.push_back(std::move(msg)); }

void clear() { messages.clear(); }

int size() const { return static_cast<int>(messages.size()); }

void save(std::string_view filePath) const;

static Conversation load(std::string_view filePath);

};

// -- Serialization helpers (internal) --

using Json = nlohmann::json;

inline std::string roleToString(Role r) {

switch (r) {

case Role::System: return "system";

case Role::User: return "user";

case Role::Assistant: return "assistant";

case Role::Tool: return "tool";

}

return "user";

}

inline Role roleFromString(const std::string& s) {

if (s == "system") return Role::System;

if (s == "assistant") return Role::Assistant;

if (s == "tool") return Role::Tool;

return Role::User;

}

inline Json contentPartToJson(const ContentPart& part) {

return std::visit([](const auto& p) -> Json {

using T = std::decay_t<decltype(p)>;

if constexpr (std::is_same_v<T, TextContent>) {

return Json{{"type", "text"}, {"text", p.text}};

} else if constexpr (std::is_same_v<T, ImageContent>) {

return Json{{"type", "image"}, {"data", p.data}, {"mediaType", p.mediaType}, {"isUrl", p.isUrl}};

} else if constexpr (std::is_same_v<T, AudioContent>) {

return Json{{"type", "audio"}, {"data", p.data}, {"format", p.format}};

} else if constexpr (std::is_same_v<T, ToolUseContent>) {

return Json{{"type", "tool_use"}, {"id", p.id}, {"name", p.name}, {"inputJson", p.inputJson}};

} else if constexpr (std::is_same_v<T, ToolResultContent>) {

return Json{{"type", "tool_result"}, {"toolUseId", p.toolUseId}, {"content", p.content}, {"isError", p.isError}};

}

}, part);

}

inline ContentPart contentPartFromJson(const Json& j) {

auto type = j.at("type").get<std::string>();

if (type == "text") {

return TextContent{.text = j.at("text").get<std::string>()};

} else if (type == "image") {

return ImageContent{

.data = j.at("data").get<std::string>(),

.mediaType = j.at("mediaType").get<std::string>(),

.isUrl = j.value("isUrl", false),

};

} else if (type == "audio") {

return AudioContent{

.data = j.at("data").get<std::string>(),

.format = j.at("format").get<std::string>(),

};

} else if (type == "tool_use") {

return ToolUseContent{

.id = j.at("id").get<std::string>(),

.name = j.at("name").get<std::string>(),

.inputJson = j.at("inputJson").get<std::string>(),

};

} else if (type == "tool_result") {

return ToolResultContent{

.toolUseId = j.at("toolUseId").get<std::string>(),

.content = j.at("content").get<std::string>(),

.isError = j.value("isError", false),

};

}

return TextContent{.text = ""};

}

inline Json messageToJson(const Message& msg) {

Json j;

j["role"] = roleToString(msg.role);

std::visit([&j](const auto& c) {

using T = std::decay_t<decltype(c)>;

if constexpr (std::is_same_v<T, std::string>) {

j["content"] = c;

} else {

Json arr = Json::array();

for (const auto& part : c) {

arr.push_back(contentPartToJson(part));

}

j["content"] = arr;

}

}, msg.content);

if (msg.cacheControl) {

j["cache_control"] = Json{{"type", msg.cacheControl->type}};

}

return j;

}

inline Message messageFromJson(const Json& j) {

Message msg;

msg.role = roleFromString(j.at("role").get<std::string>());

const auto& c = j.at("content");

if (c.is_string()) {

msg.content = c.get<std::string>();

} else if (c.is_array()) {

std::vector<ContentPart> parts;

for (const auto& elem : c) {

parts.push_back(contentPartFromJson(elem));

}

msg.content = std::move(parts);

}

if (j.contains("cache_control") && j["cache_control"].is_object()) {

msg.cacheControl = CacheControl{.type = j["cache_control"].value("type", "ephemeral")};

}

return msg;

}

void Conversation::save(std::string_view filePath) const {

Json j;

j["messages"] = Json::array();

for (const auto& msg : messages) {

j["messages"].push_back(messageToJson(msg));

}

std::ofstream out{std::string{filePath}};

out << j.dump(2, ' ', false, Json::error_handler_t::replace);

}

Conversation Conversation::load(std::string_view filePath) {

std::ifstream in{std::string{filePath}};

std::string content{std::istreambuf_iterator<char>{in}, std::istreambuf_iterator<char>{}};

auto j = Json::parse(content);

Conversation conv;

for (const auto& msgJson : j.at("messages")) {

conv.push(messageFromJson(msgJson));

}

return conv;

}

} // namespace mcpplibs::llmapi

llmapi/src/types.cppm at main · mcpplibs/llmapi · GitHub

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