Enum ContentPart 

pub enum ContentPart {
    Text {
        text: String,
    },
    Image {
        media_type: String,
        data: String,
    },
    Audio {
        media_type: String,
        data: String,
        name: Option<String>,
    },
    Video {
        media_type: String,
        data: String,
        name: Option<String>,
    },
    Document {
        media_type: String,
        data: String,
        name: Option<String>,
    },
}

A single part of a multimodal message content.

Models like GPT-4o, Claude, and Gemini accept messages with mixed text and attachment parts. When a ModelMessage contains non-empty ModelMessage::content_parts, providers serialize each part according to their native wire format instead of using the plain ModelMessage::content string.

Variants

Text

A plain text content block.

Fields

text: String

The text content.

Image

An inline image (base64-encoded).

Fields

media_type: String

MIME type of the image (e.g. "image/png", "image/jpeg").

data: String

Base64-encoded image data (no data-URL prefix, raw base64 only).

Audio

An inline audio attachment (base64-encoded).

Fields

media_type: String

MIME type of the audio (e.g. "audio/mpeg", "audio/wav").

data: String

Base64-encoded audio data (no data-URL prefix, raw base64 only).

name: Option<String>

Optional filename or user-facing label.

Video

An inline video attachment (base64-encoded).

Fields

media_type: String

MIME type of the video (e.g. "video/mp4").

data: String

Base64-encoded video data (no data-URL prefix, raw base64 only).

name: Option<String>

Optional filename or user-facing label.

Document

An inline document attachment (base64-encoded).

Fields

media_type: String

MIME type of the document (e.g. "application/pdf", "text/plain").

data: String

Base64-encoded document data (no data-URL prefix, raw base64 only).

name: Option<String>

Optional filename or user-facing label.

Implementations

impl ContentPart

pub fn is_text(&self) -> bool

Returns true if this is a text part.

pub fn is_image(&self) -> bool

Returns true if this is an image part.

pub fn is_audio(&self) -> bool

Returns true if this is an audio part.

pub fn is_video(&self) -> bool

Returns true if this is a video part.

pub fn is_document(&self) -> bool

Returns true if this is a document part.

pub fn attachment_kind(&self) -> Option<AttachmentKind>

Returns the attachment kind, if this part is an attachment.

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

Returns the MIME type for attachment parts.

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

Returns base64 data for attachment parts.

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

Optional filename/label for audio, video, or document attachments.

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

Extracts the text content if this is a text part.

pub fn text_from_parts(parts: &[ContentPart]) -> String

Returns all text content from a slice of parts, concatenated.

Trait Implementations

impl Clone for ContentPart

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContentPart

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ContentPart

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ContentPart

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ContentPart

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 ContentPart