Struct ContextWindowManager 

pub struct ContextWindowManager {
    pub max_tokens: usize,
    pub keep_first_n: usize,
    pub keep_last_n: usize,
}

Fields

max_tokens: usize

keep_first_n: usize

Always keep first N messages (typically system prompt)

keep_last_n: usize

Always keep last N messages

Implementations

impl ContextWindowManager

pub fn new(max_tokens: usize) -> Self

pub fn with_keep_first_n(self, n: usize) -> Self

pub fn with_keep_last_n(self, n: usize) -> Self

pub fn estimate_tokens(text: &str) -> usize

Simple token estimation: ~4 chars/token for Latin, ~1.5 for CJK Mixed text uses a compromise of 3 chars/token

pub fn trim(&self, messages: &mut Vec<ChatMessage>)

Trim message list to keep total tokens under max_tokens。

Trimming strategy:

• Always keep the first keep_first_n messages (typically system prompt)
• Always keep the last keep_last_n messages (recent conversation)
• Remove oldest messages from the middle until within budget

Trait Implementations

impl Clone for ContextWindowManager

fn clone(&self) -> ContextWindowManager

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContextWindowManager

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

Formats the value using the given formatter.

impl Default for ContextWindowManager

fn default() -> Self

Returns the “default value” for a type.