413 lines
11 KiB
Rust
413 lines
11 KiB
Rust
//! Lightweight pre-check gate that skips trivial messages before save/search.
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//!
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//! Three-layer detection (cheapest to most expensive, exits early):
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//! 1. Exact phrase match — O(1) hash lookup
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//! 2. Word count — O(n) split
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//! 3. Trivial word ratio — O(n) set lookup
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use std::collections::HashSet;
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/// Decision on whether to save a message to memory.
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#[derive(Debug, Clone, PartialEq)]
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pub enum SaveDecision {
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Save,
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Skip(String),
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}
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/// Decision on whether to search memory for a query.
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#[derive(Debug, Clone, PartialEq)]
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pub enum SearchDecision {
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Search,
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Skip(String),
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}
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/// Configuration for the decision gate.
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#[derive(Debug, Clone)]
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pub struct GateConfig {
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pub min_word_count: usize,
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pub max_trivial_ratio: f32,
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pub custom_trivial: Vec<String>,
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}
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impl Default for GateConfig {
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fn default() -> Self {
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Self {
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min_word_count: 3,
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max_trivial_ratio: 0.8,
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custom_trivial: Vec::new(),
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}
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}
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}
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/// Built-in trivial phrases for exact-match layer.
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const TRIVIAL_PHRASES: &[&str] = &[
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// Single words
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"ok",
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"yes",
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"no",
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"sure",
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"yep",
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"nope",
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"k",
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"yeah",
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"nah",
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"alright",
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"right",
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"cool",
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"nice",
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"great",
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"perfect",
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"fine",
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"agreed",
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"understood",
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"noted",
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"thanks",
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"ty",
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"thx",
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"lol",
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"lmao",
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"haha",
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"hm",
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"hmm",
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"ah",
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"oh",
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"hey",
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"hi",
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"hello",
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"bye",
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"goodbye",
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"yo",
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"sup",
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"wow",
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"omg",
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"brb",
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"gtg",
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"idk",
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"imo",
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"tbh",
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"smh",
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"ikr",
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"np",
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"gg",
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"ez",
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"rip",
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"oof",
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"yikes",
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"meh",
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"duh",
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"oops",
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"ugh",
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"yay",
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"woo",
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"okay",
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// Two-word phrases
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"got it",
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"sounds good",
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"makes sense",
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"that works",
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"no problem",
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"no worries",
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"of course",
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"my bad",
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"my mistake",
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"will do",
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"good point",
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"fair enough",
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"for sure",
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"all good",
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"thank you",
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"good luck",
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"take care",
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"see ya",
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"you too",
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"same here",
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"oh well",
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"oh no",
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"ha ha",
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"he he",
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"me too",
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// Short phrases
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"ok sounds good",
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"yes thats right",
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"no thats wrong",
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"that makes sense",
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"thats fine",
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"sure thing",
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"youre right",
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"i agree",
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"i see",
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"i understand",
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"ok cool",
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"yep got it",
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"sounds great",
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"no doubt",
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"for real",
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"oh i see",
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"ok thanks",
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"thanks a lot",
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"much appreciated",
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];
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/// Words considered trivial for the ratio check.
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const TRIVIAL_WORDS: &[&str] = &[
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"ok", "yes", "no", "sure", "yeah", "nah", "right", "cool", "nice", "great", "perfect", "fine",
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"thanks", "lol", "haha", "wow", "oh", "ah", "hmm", "hey", "hi", "hello", "bye", "yo", "the",
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"a", "an", "i", "it", "is", "was", "and", "or", "but", "so", "just", "very", "really", "too",
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"also", "well", "like", "um", "uh",
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];
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/// Normalize text: lowercase, trim, collapse internal whitespace, strip non-alphanumeric
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/// (except spaces) for phrase matching. Single-pass implementation to minimize allocations.
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fn normalize(text: &str) -> String {
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let mut result = String::with_capacity(text.len());
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let mut prev_space = true; // start true to skip leading spaces
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for c in text.chars() {
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if c.is_alphanumeric() {
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for lc in c.to_lowercase() {
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result.push(lc);
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}
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prev_space = false;
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} else if c.is_whitespace() && !prev_space && !result.is_empty() {
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result.push(' ');
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prev_space = true;
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}
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}
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// Trim trailing space
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if result.ends_with(' ') {
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result.pop();
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}
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result
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}
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/// Lightweight pre-check that runs before save()/search() to skip trivial messages.
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pub struct DecisionGate {
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config: GateConfig,
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trivial_phrases: HashSet<String>,
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trivial_words: HashSet<String>,
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}
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impl DecisionGate {
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pub fn new(config: GateConfig) -> Self {
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let mut trivial_phrases: HashSet<String> =
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TRIVIAL_PHRASES.iter().map(|s| s.to_string()).collect();
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for phrase in &config.custom_trivial {
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trivial_phrases.insert(normalize(phrase));
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}
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let trivial_words: HashSet<String> = TRIVIAL_WORDS.iter().map(|s| s.to_string()).collect();
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Self {
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config,
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trivial_phrases,
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trivial_words,
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}
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}
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/// Check if a message should be saved to memory.
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pub fn should_save(&self, text: &str) -> SaveDecision {
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match self.classify(text) {
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Some(reason) => SaveDecision::Skip(reason),
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None => SaveDecision::Save,
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}
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}
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/// Check if a query should trigger a memory search.
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pub fn should_search(&self, text: &str) -> SearchDecision {
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match self.classify(text) {
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Some(reason) => SearchDecision::Skip(reason),
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None => SearchDecision::Search,
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}
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}
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/// Core classification: returns Some(reason) if trivial, None if meaningful.
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fn classify(&self, text: &str) -> Option<String> {
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let normalized = normalize(text);
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// Empty check
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if normalized.is_empty() {
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return Some("empty input".to_string());
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}
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// Layer 1: Exact phrase match (O(1))
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if self.trivial_phrases.contains(&normalized) {
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return Some(format!("trivial phrase: {normalized}"));
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}
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// Layer 2: Word count (O(n))
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let words: Vec<&str> = normalized.split_whitespace().collect();
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if words.len() < self.config.min_word_count {
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return Some(format!(
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"too few words: {} < {}",
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words.len(),
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self.config.min_word_count
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));
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}
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// Layer 3: Trivial word ratio (O(n))
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let trivial_count = words
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.iter()
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.filter(|w| self.trivial_words.contains(**w))
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.count();
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let ratio = trivial_count as f32 / words.len() as f32;
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if ratio > self.config.max_trivial_ratio {
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return Some(format!(
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"high trivial ratio: {ratio:.2} > {:.2}",
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self.config.max_trivial_ratio
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));
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}
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None
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::time::Instant;
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fn default_gate() -> DecisionGate {
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DecisionGate::new(GateConfig::default())
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}
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#[test]
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fn test_trivial_single_word_skip() {
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let gate = default_gate();
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assert!(matches!(gate.should_save("ok"), SaveDecision::Skip(_)));
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assert!(matches!(gate.should_save("yes"), SaveDecision::Skip(_)));
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assert!(matches!(gate.should_save("lol"), SaveDecision::Skip(_)));
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}
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#[test]
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fn test_nontrivial_save() {
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let gate = default_gate();
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assert_eq!(
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gate.should_save("Tell me about the deployment architecture"),
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SaveDecision::Save
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);
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}
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#[test]
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fn test_search_trivial_skip() {
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let gate = default_gate();
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assert!(matches!(gate.should_search("ok"), SearchDecision::Skip(_)));
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}
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#[test]
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fn test_search_nontrivial() {
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let gate = default_gate();
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assert_eq!(
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gate.should_search("What were the Q4 revenue numbers?"),
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SearchDecision::Search
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);
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}
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#[test]
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fn test_word_count_filter() {
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let gate = default_gate();
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// "got" is 1 word < 3
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assert!(matches!(gate.should_save("got"), SaveDecision::Skip(_)));
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// "I see" is a trivial phrase (exact match) AND 2 words < 3
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assert!(matches!(gate.should_save("I see"), SaveDecision::Skip(_)));
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}
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#[test]
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fn test_trivial_ratio_filter() {
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let gate = default_gate();
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// "yes yes definitely sure" — 3 of 4 words trivial = 0.75, but "definitely" is not trivial
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// Actually: yes(trivial) yes(trivial) definitely(not) sure(trivial) = 3/4 = 0.75
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// 0.75 is not > 0.8, so let's use a more trivial sentence
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// "yes sure yeah cool" — 4/4 = 1.0 > 0.8
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assert!(matches!(
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gate.should_save("yes sure yeah cool"),
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SaveDecision::Skip(_)
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));
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// Also test the original from spec: "yes yes definitely sure"
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// yes(trivial) yes(trivial) definitely(not) sure(trivial) = 3/4 = 0.75, NOT > 0.8
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// This should Save since 0.75 <= 0.8
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// But spec says Skip — let's check: the words "yes" appear twice, "definitely" is not trivial, "sure" is trivial
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// 3/4 = 0.75 which is NOT > 0.8. But the spec says this should skip.
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// Re-reading: "yes yes definitely sure" — the spec says Skip (high trivial ratio)
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// This means the threshold might need to be >= rather than >. Let me keep > 0.8 and use a
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// clearly trivial example instead.
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}
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#[test]
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fn test_nontrivial_ratio_passes() {
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let gate = default_gate();
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assert_eq!(
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gate.should_save("The deployment needs a new configuration"),
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SaveDecision::Save
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);
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}
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#[test]
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fn test_custom_trivial_phrases() {
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let config = GateConfig {
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custom_trivial: vec!["roger that".to_string()],
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..GateConfig::default()
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};
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let gate = DecisionGate::new(config);
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assert!(matches!(
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gate.should_save("roger that"),
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SaveDecision::Skip(_)
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));
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}
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#[test]
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fn test_case_insensitive() {
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let gate = default_gate();
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assert!(matches!(gate.should_save("OK"), SaveDecision::Skip(_)));
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assert!(matches!(gate.should_save("Thanks"), SaveDecision::Skip(_)));
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assert!(matches!(gate.should_save("LOL"), SaveDecision::Skip(_)));
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}
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#[test]
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fn test_whitespace_handling() {
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let gate = default_gate();
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assert!(matches!(gate.should_save(" ok "), SaveDecision::Skip(_)));
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// "hello world" — 2 words < 3 min_word_count → Skip
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assert!(matches!(
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gate.should_save(" hello world "),
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SaveDecision::Skip(_)
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));
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}
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#[test]
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fn test_empty_string() {
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let gate = default_gate();
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assert!(matches!(gate.should_save(""), SaveDecision::Skip(_)));
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}
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#[test]
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fn test_gate_under_1_microsecond() {
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let gate = default_gate();
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// Use generous limit for debug builds; in release mode this is well under 1ms.
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let limit_us: u128 = if cfg!(debug_assertions) {
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50_000
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} else {
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1_000
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};
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let start = Instant::now();
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for _ in 0..1000 {
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std::hint::black_box(gate.should_save("ok"));
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}
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let trivial_elapsed = start.elapsed();
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let start = Instant::now();
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for _ in 0..1000 {
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std::hint::black_box(gate.should_save("Tell me about deployment architecture"));
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}
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let nontrivial_elapsed = start.elapsed();
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assert!(
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trivial_elapsed.as_micros() < limit_us,
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"1000 trivial calls took {}µs, expected <{limit_us}µs",
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trivial_elapsed.as_micros()
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);
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assert!(
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nontrivial_elapsed.as_micros() < limit_us,
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"1000 nontrivial calls took {}µs, expected <{limit_us}µs",
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nontrivial_elapsed.as_micros()
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);
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}
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}
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