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use crate::ValidationError;
use crate::messages::ClaudeModel;
use std::fmt::Display;
/// The maximum number of tokens.
///
/// Note that our models may stop before reaching this maximum. This parameter only specifies the absolute maximum number of tokens to generate.
///
/// Different models have different maximum values for this parameter. See [models](https://docs.anthropic.com/claude/docs/models-overview) for details.
#[derive(
Debug,
Clone,
Copy,
PartialEq,
Eq,
PartialOrd,
Ord,
Hash,
serde::Serialize,
serde::Deserialize,
)]
#[serde(transparent)]
pub struct MaxTokens {
value: u32,
}
impl Default for MaxTokens {
fn default() -> Self {
Self {
value: 4096,
}
}
}
impl Display for MaxTokens {
fn fmt(
&self,
f: &mut std::fmt::Formatter<'_>,
) -> std::fmt::Result {
write!(f, "{}", self.value)
}
}
impl MaxTokens {
/// Creates a new maximum number of tokens.
///
/// ## Arguments
/// - `value` - The value of the maximum number of tokens.
/// - `model` - The target Claude model.
///
/// ## Errors
/// It returns a validation error if the value is greater than the maximum number of tokens for the model.
pub fn new(
value: u32,
model: ClaudeModel,
) -> Result<MaxTokens, ValidationError<u32>> {
if model.max_tokens() > 0 && value > model.max_tokens() {
return Err(ValidationError {
_type: "MaxTokens".to_string(),
expected: format!(
"The maximum number of tokens for the model: {} is {}.",
model,
model.max_tokens()
),
actual: value,
});
}
Ok(Self {
value,
})
}
/// Creates a new maximum number of tokens for the model.
pub fn from_model(model: ClaudeModel) -> Self {
Self {
value: model.max_tokens(),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn default() {
assert_eq!(
MaxTokens::default(),
MaxTokens {
value: 4096
}
);
}
#[test]
fn display() {
assert_eq!(
MaxTokens {
value: 4096
}
.to_string(),
"4096"
);
}
#[test]
fn new() {
assert!(
MaxTokens::new(4096, ClaudeModel::Claude3Sonnet20240229).is_ok()
);
assert!(
MaxTokens::new(4097, ClaudeModel::Claude3Sonnet20240229).is_err()
);
}
#[test]
fn serialize() {
assert_eq!(
serde_json::to_string(&MaxTokens::default()).unwrap(),
"4096"
);
assert_eq!(
serde_json::from_str::<MaxTokens>("4096").unwrap(),
MaxTokens::default()
);
}
#[test]
fn deserialize() {
assert_eq!(
serde_json::from_str::<MaxTokens>("4096").unwrap(),
MaxTokens::default()
);
}
}