7a1c2779a7
Ship @deepseek-ai/dsh-retention under packages/util/: pure ItemRetainer / TextRetainer plus neutral notice helpers, so tools that cap model-facing output share one "what did we keep, what did we omit, may we stop reading" mechanic while keeping grouping, exit codes, provider errors, and recovery prose tool-owned. The two retainers are separate names because they differ in resource model: item-head can stop the upstream on the first over-cap probe (shouldStop), while text tail/head-tail must read to the end. The library documents glob/grep/bash/web_fetch/web_search mappings but migrates no tool yet — glob/grep don't exist, and migration is deliberately separate work. Flips the RFC to implemented/ and rewrites its skeleton to shipped reality.
349 lines
15 KiB
TypeScript
349 lines
15 KiB
TypeScript
import { describe, expect, it } from 'vitest'
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import {
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describeOmitted,
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formatRetentionNotice,
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ItemRetainer,
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type Omitted,
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type RetentionNotice,
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TextRetainer,
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} from '@deepseek-ai/dsh-retention'
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/** Decode a RetainedText via a round-trip helper for readable UTF-8 assertions. */
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const utf8 = (s: string): Uint8Array => new TextEncoder().encode(s)
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describe('ItemRetainer — head, stopWhenFull (glob/grep early stop)', () => {
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it('keeps the first maxItems and asks to stop on the probe item', () => {
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const r = new ItemRetainer<string>({ kind: 'head', maxItems: 2, stop: 'stopWhenFull' })
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expect(r.push('a')).toEqual({ kept: true, truncated: false, shouldStop: false })
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expect(r.push('b')).toEqual({ kept: true, truncated: false, shouldStop: false })
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// The (maxItems + 1)th valid item is the probe: not retained, sets truncated,
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// and shouldStop tells the caller to kill the upstream.
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expect(r.push('c')).toEqual({ kept: false, truncated: true, shouldStop: true })
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const result = r.finish()
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expect(result.items).toEqual(['a', 'b'])
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expect(result.kept).toBe(2)
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expect(result.seen).toBe(3)
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expect(result.truncated).toBe(true)
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// Early stop knows only a lower bound, never an exact total.
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expect(result.omitted).toEqual<Omitted>({ kind: 'atLeast', count: 1 })
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})
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it('reports none when everything fits', () => {
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const r = new ItemRetainer<number>({ kind: 'head', maxItems: 3, stop: 'stopWhenFull' })
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r.push(1)
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r.push(2)
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const result = r.finish()
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expect(result.items).toEqual([1, 2])
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expect(result.truncated).toBe(false)
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expect(result.omitted).toEqual<Omitted>({ kind: 'none' })
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})
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})
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describe('ItemRetainer — head, readToEnd (exact omission)', () => {
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it('keeps draining past the cap and reports an exact omitted count', () => {
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const r = new ItemRetainer<string>({ kind: 'head', maxItems: 1, stop: 'readToEnd' })
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expect(r.push('a')).toEqual({ kept: true, truncated: false, shouldStop: false })
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// readToEnd never asks to stop — the caller must keep pushing to count exactly.
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expect(r.push('b')).toEqual({ kept: false, truncated: true, shouldStop: false })
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expect(r.push('c')).toEqual({ kept: false, truncated: true, shouldStop: false })
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const result = r.finish()
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expect(result.items).toEqual(['a'])
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expect(result.seen).toBe(3)
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expect(result.omitted).toEqual<Omitted>({ kind: 'exact', count: 2 })
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})
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})
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describe('ItemRetainer — zero budget', () => {
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it('keeps nothing; first item is the probe under stopWhenFull', () => {
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const r = new ItemRetainer<string>({ kind: 'head', maxItems: 0, stop: 'stopWhenFull' })
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expect(r.push('a')).toEqual({ kept: false, truncated: true, shouldStop: true })
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const result = r.finish()
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expect(result.items).toEqual([])
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expect(result.kept).toBe(0)
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expect(result.omitted).toEqual<Omitted>({ kind: 'atLeast', count: 1 })
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})
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it('rejects a non-integer / negative maxItems', () => {
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expect(() => new ItemRetainer({ kind: 'head', maxItems: -1, stop: 'readToEnd' }))
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.toThrow(/maxItems must be a non-negative integer/)
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expect(() => new ItemRetainer({ kind: 'head', maxItems: 1.5, stop: 'readToEnd' }))
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.toThrow(/maxItems must be a non-negative integer/)
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})
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})
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describe('TextRetainer — head, stopWhenFull (early body stop)', () => {
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it('keeps the prefix and asks to stop on the overflowing chunk', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 5, stop: 'stopWhenFull' })
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expect(r.push('abc')).toEqual({ kept: true, truncated: false, shouldStop: false })
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// 'de' fills the cap exactly (5 bytes) — still fully kept.
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expect(r.push('de')).toEqual({ kept: true, truncated: false, shouldStop: false })
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// 'fgh' is wholly dropped: kept:false, and stopWhenFull → shouldStop.
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expect(r.push('fgh')).toEqual({ kept: false, truncated: true, shouldStop: true })
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const result = r.finish()
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expect(result.text).toBe('abcde')
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expect(result.truncated).toBe(true)
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// Early stop: a lower bound, not an exact size.
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'atLeast', count: 3 })
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})
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it('flags a partially-dropped chunk as not fully kept', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 4, stop: 'stopWhenFull' })
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r.push('ab')
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// 'cde' straddles the cap: 'c','d' fit, 'e' drops → kept:false, shouldStop.
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expect(r.push('cde')).toEqual({ kept: false, truncated: true, shouldStop: true })
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expect(r.finish().text).toBe('abcd')
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})
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})
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describe('TextRetainer — head, readToEnd (exact omission)', () => {
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it('keeps the prefix, drains the rest, and counts exactly', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 3, stop: 'readToEnd' })
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r.push('abc')
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expect(r.push('defg')).toEqual({ kept: false, truncated: true, shouldStop: false })
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const result = r.finish()
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expect(result.text).toBe('abc')
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 4 })
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})
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})
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describe('TextRetainer — tail (exact omission, reads to end)', () => {
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it('keeps the final maxBytes and reports exact omission', () => {
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const r = new TextRetainer({ kind: 'tail', maxBytes: 4 })
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// tail never asks to stop — it must read to the end to know the true suffix.
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expect(r.push('hello')).toEqual({ kept: false, truncated: true, shouldStop: false })
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r.push('world')
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const result = r.finish()
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expect(result.text).toBe('orld') // last 4 bytes of 'helloworld'
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expect(result.truncated).toBe(true)
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 6 })
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})
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it('keeps everything when the stream is under the cap', () => {
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const r = new TextRetainer({ kind: 'tail', maxBytes: 100 })
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r.push('short')
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const result = r.finish()
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expect(result.text).toBe('short')
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expect(result.truncated).toBe(false)
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'none' })
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})
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it('drops old chunks as they slide out of the tail window', () => {
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const r = new TextRetainer({ kind: 'tail', maxBytes: 3 })
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for (const c of ['11', '22', '33', '44']) r.push(c)
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// Only the final 3 bytes survive; earlier whole chunks are dropped.
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expect(r.finish().text).toBe('344')
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})
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})
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describe('TextRetainer — headTail (prefix + suffix, omit the middle)', () => {
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it('keeps a stable head and tail, omitting the middle exactly', () => {
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const r = new TextRetainer({ kind: 'headTail', headBytes: 3, tailBytes: 3 })
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r.push('abcdefghij') // 10 bytes: head 'abc', tail 'hij', middle 'defg' omitted
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const result = r.finish()
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expect(result.text).toBe('abchij')
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expect(result.truncated).toBe(true)
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 4 })
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})
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it('does not double-count when head+tail cover the whole stream', () => {
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const r = new TextRetainer({ kind: 'headTail', headBytes: 3, tailBytes: 3 })
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r.push('abcdef') // exactly head(3) + tail(3), nothing omitted
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const result = r.finish()
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expect(result.text).toBe('abcdef')
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expect(result.truncated).toBe(false)
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'none' })
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})
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})
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describe('TextRetainer — zero budgets', () => {
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it('head maxBytes 0 keeps nothing and stops on first byte (stopWhenFull)', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 0, stop: 'stopWhenFull' })
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expect(r.push('x')).toEqual({ kept: false, truncated: true, shouldStop: true })
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const result = r.finish()
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expect(result.text).toBe('')
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'atLeast', count: 1 })
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})
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it('an empty stream omits nothing', () => {
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const r = new TextRetainer({ kind: 'headTail', headBytes: 2, tailBytes: 2 })
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const result = r.finish()
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expect(result.text).toBe('')
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expect(result.truncated).toBe(false)
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'none' })
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})
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it('rejects non-integer / negative byte budgets', () => {
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expect(() => new TextRetainer({ kind: 'head', maxBytes: -1, stop: 'readToEnd' }))
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.toThrow(/maxBytes must be a non-negative integer/)
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expect(() => new TextRetainer({ kind: 'tail', maxBytes: 2.5 }))
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.toThrow(/maxBytes must be a non-negative integer/)
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expect(() => new TextRetainer({ kind: 'headTail', headBytes: -1, tailBytes: 2 }))
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.toThrow(/headBytes must be a non-negative integer/)
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expect(() => new TextRetainer({ kind: 'headTail', headBytes: 2, tailBytes: 1.1 }))
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.toThrow(/tailBytes must be a non-negative integer/)
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})
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})
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describe('TextRetainer — UTF-8 boundary handling', () => {
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it('trims a partial codepoint at the head cut instead of emitting U+FFFD', () => {
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// '€' is 3 bytes (E2 82 AC). A 2-byte head cap keeps 'a' (61) + the first
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// byte of '€' (E2); that partial lead byte must be trimmed, not decoded to
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// a replacement char.
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const r = new TextRetainer({ kind: 'head', maxBytes: 2, stop: 'readToEnd' })
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r.push('a€b') // bytes: 61 E2 82 AC 62
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const result = r.finish()
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expect(result.text).toBe('a') // partial '€' dropped, no U+FFFD
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expect(result.text).not.toContain('<27>')
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// Omission counts BYTES not kept by retention: 5 total − 2 prefix = 3.
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 3 })
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})
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it('trims a leading partial codepoint at the tail cut', () => {
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// Tail cap 2 over 'a€b' (5 bytes) keeps AC 62 — AC is a continuation byte
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// (the middle of '€'); the leading continuation byte is dropped so the tail
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// begins on a boundary.
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const r = new TextRetainer({ kind: 'tail', maxBytes: 2 })
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r.push('a€b')
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const result = r.finish()
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expect(result.text).toBe('b') // partial '€' at the front dropped
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expect(result.text).not.toContain('<27>')
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})
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it('preserves a whole multibyte codepoint that fits exactly', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 3, stop: 'readToEnd' })
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r.push('€x') // '€' is exactly 3 bytes
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expect(r.finish().text).toBe('€')
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})
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it('does not reconstruct a codepoint across the omitted middle', () => {
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// headBytes ends mid-'€' and tailBytes starts mid-another '€'; neither cut
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// may glue a valid codepoint across the gap.
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const r = new TextRetainer({ kind: 'headTail', headBytes: 2, tailBytes: 2 })
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r.push('€€€') // 9 bytes
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const result = r.finish()
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expect(result.text).not.toContain('<27>')
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expect(result.truncated).toBe(true)
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})
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it('accepts a raw Uint8Array chunk', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 2, stop: 'readToEnd' })
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r.push(utf8('xy'))
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r.push(utf8('z'))
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expect(r.finish().text).toBe('xy')
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})
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it('trims a partial 2-byte codepoint at the head cut', () => {
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// 'é' is 2 bytes (C3 A9). A 2-byte head cap over 'aé' keeps 'a' (61) + the
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// lead byte of 'é' (C3) — an incomplete 2-byte sequence to trim.
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const r = new TextRetainer({ kind: 'head', maxBytes: 2, stop: 'readToEnd' })
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r.push('aé') // bytes: 61 C3 A9
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const result = r.finish()
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expect(result.text).toBe('a')
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expect(result.text).not.toContain('<27>')
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})
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it('trims a partial 4-byte codepoint (emoji) at the head cut', () => {
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// '😀' is 4 bytes (F0 9F 98 80). A 3-byte head cap keeps 'a' + the first two
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// bytes of the emoji — an incomplete 4-byte sequence that must be trimmed.
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const r = new TextRetainer({ kind: 'head', maxBytes: 3, stop: 'readToEnd' })
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r.push('a😀') // bytes: 61 F0 9F 98 80
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const result = r.finish()
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expect(result.text).toBe('a')
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expect(result.text).not.toContain('<27>')
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})
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it('keeps a whole 4-byte codepoint that fits exactly', () => {
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const r = new TextRetainer({ kind: 'head', maxBytes: 4, stop: 'readToEnd' })
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r.push('😀x')
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expect(r.finish().text).toBe('😀')
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})
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it('leaves a head cut ending on a stray continuation run untouched', () => {
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// A cut whose trailing bytes are ALL continuation bytes with no lead in
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// reach is not a trimmable incomplete sequence — the trimmer bails (no lead
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// byte found) and leaves them for the non-fatal decoder to replace.
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const r = new TextRetainer({ kind: 'head', maxBytes: 2, stop: 'readToEnd' })
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// 0x80 0x80 are bare continuation bytes; 'z' follows so the head keeps just
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// the two continuation bytes and the cut lands right after them.
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r.push(new Uint8Array([0x80, 0x80, 0x7a]))
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const result = r.finish()
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// The trimmer did not throw and did not eat the bytes as a partial sequence;
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// only the trailing 'z' is omitted by the 2-byte cap.
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 1 })
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})
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it('leaves a head cut ending on an invalid lead byte untouched', () => {
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// 0xF8 is not a valid UTF-8 lead byte (only 0x00–0xF7 lead). The trimmer
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// recognizes it as "not a lead" (expected length 0) and leaves the byte in
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// place rather than trimming a phantom partial sequence.
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const r = new TextRetainer({ kind: 'head', maxBytes: 1, stop: 'readToEnd' })
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r.push(new Uint8Array([0xf8, 0x61])) // 0xF8 kept, 'a' dropped by the 1-byte cap
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const result = r.finish()
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expect(result.omittedBytes).toEqual<Omitted>({ kind: 'exact', count: 1 })
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})
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})
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describe('describeOmitted — false precision safety', () => {
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it('prints an exact count for exact omission', () => {
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expect(describeOmitted({ kind: 'exact', count: 3 }, 'items')).toBe('Omitted 3 items.')
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expect(describeOmitted({ kind: 'exact', count: 12 }, 'bytes')).toBe('Omitted 12 bytes.')
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})
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it('prints NO count for atLeast (early stop) and unknown', () => {
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// The whole point of atLeast: never claim "omitted 1" when the true count is
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// unknown. Both atLeast and unknown collapse to a countless clause.
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expect(describeOmitted({ kind: 'atLeast', count: 1 }, 'items')).toBe('More items were omitted.')
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expect(describeOmitted({ kind: 'unknown' }, 'lines')).toBe('More lines were omitted.')
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})
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it('returns empty string when nothing was omitted', () => {
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expect(describeOmitted({ kind: 'none' }, 'chars')).toBe('')
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})
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})
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describe('formatRetentionNotice', () => {
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const notice = (omitted: Omitted): RetentionNotice => ({
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scope: 'grep',
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strategy: 'head',
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unit: 'items',
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limit: 100,
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kept: 100,
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omitted,
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})
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it('joins the standardized omission clause with the tool recovery guidance', () => {
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const out = formatRetentionNotice(
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notice({ kind: 'atLeast', count: 1 }),
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({ kept }) => `Results capped at ${kept}. Narrow the pattern, path, or include to see more.`,
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)
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expect(out).toBe('More items were omitted. Results capped at 100. Narrow the pattern, path, or include to see more.')
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})
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it('omits the empty half when nothing was omitted', () => {
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const out = formatRetentionNotice(notice({ kind: 'none' }), () => 'Recovery text.')
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expect(out).toBe('Recovery text.')
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})
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it('omits the empty half when the tool supplies no recovery text', () => {
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const out = formatRetentionNotice(notice({ kind: 'exact', count: 2 }), () => '')
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expect(out).toBe('Omitted 2 items.')
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})
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it('passes the full notice to the recovery builder (limit as a head/tail pair)', () => {
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const headTail: RetentionNotice = {
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scope: 'bash stdout',
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strategy: 'headTail',
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unit: 'bytes',
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limit: { head: 2_000, tail: 2_000 },
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kept: 4_000,
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omitted: { kind: 'exact', count: 500 },
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}
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const out = formatRetentionNotice(headTail, n =>
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typeof n.limit === 'object' ? `Kept ${n.limit.head}B head + ${n.limit.tail}B tail.` : '')
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expect(out).toBe('Omitted 500 bytes. Kept 2000B head + 2000B tail.')
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})
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})
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