Enum BaseMessage 

pub enum BaseMessage {
    Human(HumanMessage),
    System(SystemMessage),
    AI(AIMessage),
    Tool(ToolMessage),
    Chat(ChatMessage),
    Function(FunctionMessage),
    Remove(RemoveMessage),
}

A unified message type that can represent any message role.

This corresponds to BaseMessage in LangChain Python.

Variants

Human(HumanMessage)

A human message

System(SystemMessage)

A system message

AI(AIMessage)

An AI message

Tool(ToolMessage)

A tool result message

Chat(ChatMessage)

A chat message with arbitrary role

Function(FunctionMessage)

A function message (deprecated, use Tool)

Remove(RemoveMessage)

A remove message (for message deletion)

Implementations

impl BaseMessage

pub fn content(&self) -> &str

Get the message content as a string reference.

For messages with multimodal content, this returns the first text content or an empty string.

pub fn text(&self) -> String

Get the text content of the message as a string.

This extracts text from both simple string content and list content (filtering for text blocks). Corresponds to the text property in Python.

pub fn id(&self) -> Option<&str>

Get the message ID.

pub fn name(&self) -> Option<&str>

Get the message name if present.

pub fn tool_calls(&self) -> &[ToolCall]

Get tool calls if this is an AI message.

pub fn message_type(&self) -> &'static str

Get the message type as a string.

pub fn additional_kwargs(&self) -> Option<&HashMap<String, Value>>

Get additional kwargs if present.

pub fn response_metadata(&self) -> Option<&HashMap<String, Value>>

Get response metadata if present.

pub fn pretty_print(&self)

Pretty print the message to stdout. This mimics LangChain’s pretty_print() method for messages.

pub fn pretty_repr(&self, html: bool) -> String

Get a pretty representation of the message.

Arguments

• html - Whether to format the message with bold text (using ANSI codes). Named html for Python compatibility but actually uses terminal codes.

Trait Implementations

impl Clone for BaseMessage

fn clone(&self) -> BaseMessage

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BaseMessage

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BaseMessage

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<AIMessage> for BaseMessage

fn from(msg: AIMessage) -> Self

Converts to this type from the input type.

impl From<BaseMessage> for StringOrMessage

fn from(msg: BaseMessage) -> Self

Converts to this type from the input type.

impl From<ChatMessage> for BaseMessage

fn from(msg: ChatMessage) -> Self

Converts to this type from the input type.

impl From<FunctionMessage> for BaseMessage

fn from(msg: FunctionMessage) -> Self

Converts to this type from the input type.

impl From<HumanMessage> for BaseMessage

fn from(msg: HumanMessage) -> Self

Converts to this type from the input type.

impl From<RemoveMessage> for BaseMessage

fn from(msg: RemoveMessage) -> Self

Converts to this type from the input type.

impl From<SystemMessage> for BaseMessage

fn from(msg: SystemMessage) -> Self

Converts to this type from the input type.

impl From<ToolMessage> for BaseMessage

fn from(msg: ToolMessage) -> Self

Converts to this type from the input type.

impl HasId for BaseMessage

fn get_id(&self) -> Option<&str>

Get the ID if present.

impl PartialEq for BaseMessage

fn eq(&self, other: &BaseMessage) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for BaseMessage

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for BaseMessage