feat: conformance tests pass for first time
Change implementation to exponentially increase search space at each level.
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13 changed files with 1852 additions and 102 deletions
254
conformance-tests/generator/src/main.rs
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254
conformance-tests/generator/src/main.rs
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mod model;
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use model::{Insert, Scenario};
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use peoplesgrocers_lseq::{LseqRng, SortKey, LSEQ};
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use rand::{rngs::StdRng, Rng, SeedableRng};
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use std::fs;
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/// A recording RNG wrapper that records random values as floats
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/// compatible with TypeScript's Math.random() consumption pattern.
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struct RecordingRng {
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inner: StdRng,
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recorded: Vec<f64>,
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}
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impl RecordingRng {
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fn new(seed: u64) -> Self {
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RecordingRng {
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inner: StdRng::seed_from_u64(seed),
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recorded: Vec::new(),
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}
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}
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fn take_recorded(&mut self) -> Vec<f64> {
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std::mem::take(&mut self.recorded)
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}
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}
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impl LseqRng for RecordingRng {
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fn gen_bool(&mut self, p: f64) -> bool {
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// Use fully qualified syntax to call rand::Rng method
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let result = Rng::gen_bool(&mut self.inner, p);
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// Record a float that TypeScript's `f < p` would produce the same result
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// If result is true, we need f < p, so use p/2
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// If result is false, we need f >= p, so use (1 + p) / 2
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let recorded_value = if result { p / 2.0 } else { (1.0 + p) / 2.0 };
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self.recorded.push(recorded_value);
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result
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}
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fn gen_range(&mut self, range: std::ops::Range<u64>) -> u64 {
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// Use fully qualified syntax to call rand::Rng method
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let result: u64 = Rng::gen_range(&mut self.inner, range.clone());
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// Record a float that TypeScript's `Math.floor(f * range_size)` would produce the same result
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// For result r in [0, range_size), we need floor(f * range_size) = r
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// So f should be in [r/range_size, (r+1)/range_size)
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// Use midpoint: (r + 0.5) / range_size
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let range_size = (range.end - range.start) as f64;
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let relative_result = (result - range.start) as f64;
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let recorded_value = (relative_result + 0.5) / range_size;
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self.recorded.push(recorded_value);
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result
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}
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}
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fn generate_scenario(
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name: &str,
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description: &str,
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seed: u64,
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init: Vec<&str>,
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ops: impl FnOnce(&mut LSEQ<RecordingRng>, &mut Vec<String>) -> Vec<Insert>,
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) -> Scenario {
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let mut lseq = LSEQ::new(RecordingRng::new(seed));
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let mut state: Vec<String> = init.iter().map(|s| s.to_string()).collect();
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let operations = ops(&mut lseq, &mut state);
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Scenario {
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name: name.to_string(),
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description: description.to_string(),
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seed,
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init: init.iter().map(|s| s.to_string()).collect(),
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rng: lseq.take_rng().take_recorded(),
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operations,
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}
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}
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fn main() {
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let scenarios = vec![
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// 01 - Sequential append
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generate_scenario(
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"sequential-append",
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"20 inserts, each after the last",
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42,
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vec![],
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|lseq, state| {
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let mut ops = Vec::new();
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for _ in 0..20 {
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let before_key = state.last().map(|s| s.parse::<SortKey>().unwrap());
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let result = lseq.alloc(before_key.as_ref(), None);
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let result_str = result.to_string();
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ops.push(Insert::After {
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index: -1, // after last element (or beginning if empty)
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outcome: result_str.clone(),
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});
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state.push(result_str);
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}
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ops
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},
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),
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// 02 - Sequential prepend
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generate_scenario(
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"sequential-prepend",
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"20 inserts, each before the first",
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43,
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vec![],
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|lseq, state| {
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let mut ops = Vec::new();
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for _ in 0..20 {
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let after_key = state.first().map(|s| s.parse::<SortKey>().unwrap());
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let result = lseq.alloc(None, after_key.as_ref());
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let result_str = result.to_string();
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ops.push(Insert::Before {
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index: 0, // before first element (prepend)
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outcome: result_str.clone(),
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});
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state.insert(0, result_str);
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}
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ops
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},
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),
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// 03 - Random insert 100 items
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generate_scenario(
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"random-insert-100-items",
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"100 inserts at random positions",
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44,
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vec![],
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|lseq, state| {
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let mut ops = Vec::new();
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let mut position_rng = StdRng::seed_from_u64(100); // Separate RNG for positions
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for _ in 0..100 {
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// Pick a random insertion point (0..=state.len())
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let idx = if state.is_empty() {
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0
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} else {
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Rng::gen_range(&mut position_rng, 0..=state.len())
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};
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// Derive beforeKey and afterKey from the insertion index
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let before_key = if idx > 0 {
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Some(state[idx - 1].parse::<SortKey>().unwrap())
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} else {
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None
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};
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let after_key = if idx < state.len() {
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Some(state[idx].parse::<SortKey>().unwrap())
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} else {
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None
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};
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let result = lseq.alloc(before_key.as_ref(), after_key.as_ref());
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let result_str = result.to_string();
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ops.push(Insert::Before {
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index: idx as i32,
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outcome: result_str.clone(),
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});
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state.insert(idx, result_str);
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}
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ops
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},
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),
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// 04 - Dense packing
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generate_scenario(
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"dense-packing",
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"20 inserts between adjacent keys '0' and '1'",
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45,
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vec!["0", "1"],
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|lseq, state| {
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let mut ops = Vec::new();
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// Always insert between first and second element
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for _ in 0..20 {
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let before_key = state[0].parse::<SortKey>().unwrap();
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let after_key = state[1].parse::<SortKey>().unwrap();
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let result = lseq.alloc(Some(&before_key), Some(&after_key));
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let result_str = result.to_string();
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ops.push(Insert::Before {
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index: 1, // between state[0] and state[1]
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outcome: result_str.clone(),
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});
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state.insert(1, result_str);
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}
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ops
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},
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),
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// 05 - Deep nesting
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generate_scenario(
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"deep-nesting",
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"Force 5+ level deep keys by inserting between adjacent keys",
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46,
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vec!["M", "N"],
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|lseq, state| {
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let mut ops = Vec::new();
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// Keep inserting between first two to force depth
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for _ in 0..30 {
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let before_key = state[0].parse::<SortKey>().unwrap();
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let after_key = state[1].parse::<SortKey>().unwrap();
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let result = lseq.alloc(Some(&before_key), Some(&after_key));
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let result_str = result.to_string();
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ops.push(Insert::Before {
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index: 1, // between state[0] and state[1]
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outcome: result_str.clone(),
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});
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state.insert(1, result_str);
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}
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ops
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},
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),
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// 06 - Edge min interval
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generate_scenario(
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"edge-min-interval",
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"Insert between adjacent keys (A, B) which have interval=1",
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47,
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vec!["A", "B"],
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|lseq, state| {
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let mut ops = Vec::new();
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for _ in 0..10 {
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let before_key = state[0].parse::<SortKey>().unwrap();
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let after_key = state[1].parse::<SortKey>().unwrap();
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let result = lseq.alloc(Some(&before_key), Some(&after_key));
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let result_str = result.to_string();
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ops.push(Insert::Before {
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index: 1, // between state[0] and state[1]
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outcome: result_str.clone(),
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});
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state.insert(1, result_str);
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}
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ops
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},
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),
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];
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// Write each scenario to a file
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let output_dir = "../genfiles";
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fs::create_dir_all(output_dir).expect("Failed to create genfiles directory");
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for (i, scenario) in scenarios.iter().enumerate() {
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let filename = format!("{}/{:02}-{}.scenario.json", output_dir, i + 1, scenario.name);
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let json = serde_json::to_string_pretty(scenario).expect("Failed to serialize scenario");
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fs::write(&filename, json).expect("Failed to write scenario file");
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println!("Generated: {}", filename);
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}
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}
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