tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it./home/user/instruction.md
1 # Implement the line diff (minimal canonical edit script) 2 3 ## Context 4 `diff-patch-engine` is the line-level diff/patch building block behind our 5 `git diff`-style tooling and three-way merges (TypeScript, Node 20). It computes 6 an ordered edit script between two sequences of lines and can replay that script 7 onto the original to reproduce the target. 8 9 `applyPatch(original, edits)` (the diff's own verifier), `diffStats`, and the 10 `splitLines` / `joinLines` text helpers are all provided and must not be 11 changed. **Only `diff(a, b)` is unimplemented.** 12 13 ## Your task 14 Implement `src/diff/myers.ts` → `diff(a: string[], b: string[]): Edit[]`, 15 returning an ordered list of `eq` / `del` / `ins` edits (see `Edit` / `EditOp` 16 in `types.ts`). The returned script is graded against three independent 17 properties , **validity**, **minimality**, and a **canonical tie-break** , and 18 must satisfy all three for every input. Being valid and minimal is *not* 19 sufficient: a uniquely determined script is required and any other minimal 20 script is graded wrong. 21 22 Each op consumes lines as follows: an `eq` consumes one line from each side and 23 those two lines are equal; a `del` consumes one line from `a`; an `ins` consumes 24 one line from `b`. 25 26 ### 1. Validity 27 `applyPatch(a, diff(a, b))` must deep-equal `b`. Equivalently, both of these 28 hold simultaneously: 29 - the subsequence of `eq` + `del` lines, in order, equals `a`; 30 - the subsequence of `eq` + `ins` lines, in order, equals `b`; 31 32 and every `eq` carries a line equal to the line it consumes on each side. 33 34 ### 2. Minimality 35 Among all valid scripts, the returned one must use the fewest non-`eq` ops. Let 36 `C(a, b)` be the maximum possible number of `eq` ops over all valid scripts for 37 the pair (equivalently, the length of the longest common subsequence of `a` and 38 `b`). Then the script must have exactly `C(a, b)` `eq` ops and exactly 39 `a.length + b.length - 2 * C(a, b)` non-`eq` ops (`del` + `ins`). This is what 40 makes the result a *diff* rather than "delete all of `a`, then insert all of 41 `b`". 42 43 ### 3. Canonical tie-break (the crux) 44 Many distinct valid, minimal scripts can exist for one pair. Exactly one of them 45 is canonical, and that is the one you must return. The canonical script is the 46 unique valid, minimal script characterised by the following property, applied to 47 the script read left to right. 48 49 > Consider the script as a left-to-right interleaving of `a` and `b`. Walk a 50 > pair of cursors `(i, j)` , `i` into `a`, `j` into `b` , both starting at the 51 > first line. At each step the next op of the script decides which cursor(s) 52 > advance: `del` advances `i`, `ins` advances `j`, `eq` advances both (and 53 > requires `a[i] === b[j]`). 54 > 55 > Call an op **length-preserving at `(i, j)`** if the script can still be 56 > completed, from the resulting cursor position, into a valid script that meets 57 > the minimality bound of clause 2 for the whole pair. The canonical script is 58 > the one that, at every step, makes the **highest-priority length-preserving 59 > choice** under this fixed priority order: 60 > 61 > 1. `del` of `a[i]` , chosen whenever it is length-preserving at `(i, j)`; 62 > 2. otherwise `ins` of `b[j]` , chosen whenever it is length-preserving at 63 > `(i, j)`; 64 > 3. otherwise `eq` of the shared line (this case forces `a[i] === b[j]`). 65 > 66 > When `i` has reached the end of `a`, only `ins` remains; when `j` has reached 67 > the end of `b`, only `del` remains; when both are at the end, the script ends. 68 69 The grader pins this exact script; any other valid, minimal, but 70 differently-resolved script is rejected. 71 72 ## Edge cases to get right 73 - `a` and `b` equal → all `eq`, no `del`/`ins`. 74 - `a` empty → every line of `b` as `ins`, in order. 75 - `b` empty → every line of `a` as `del`, in order. 76 - both empty (`[]`) → `[]`. 77 - Lines are compared by exact string equality only , no Unicode normalization, 78 no trimming. Lines containing whitespace, tabs, emoji, combining characters, 79 newline characters, or text that looks like an op name are opaque values. 80 - Callers diffing text use `splitLines`, so a trailing newline appears as a 81 final `""` entry and must be preserved verbatim. The empty string is `[""]` 82 (length 1), never `[]`. 83 - The same `(a, b)` must always produce the identical script (determinism). 84 85 ## Performance & memory 86 Inputs can be large , up to ~100,000 lines , and are frequently *largely 87 identical*: two revisions of the same file, sharing long common runs at the 88 start, the end, or both. Your implementation must use memory **proportional to 89 the input size** on such inputs. Allocating a full `n × m` dynamic-programming 90 table is `Θ(n·m)` memory and will **exhaust the available memory on large 91 inputs , that is graded as a failure**. The constraint only bites at scale: 92 small inputs may be handled however you like. Time should stay within a few 93 seconds even for the largest inputs. 94 95 ## Definition of done 96 `npm run typecheck` is clean and `npm test` passes. Implement `diff` only , do 97 not modify `applyPatch`, the text helpers, the types/errors, or the tests. 98
/home/user/app/src/diff/myers.ts
/home/user/app/src/diff/types.ts
1 /**
2 * Types for the line-oriented diff + patch engine.
3 *
4 * A diff is an **edit script**: an ordered list of operations that, replayed
5 * against the original sequence of lines, reproduces the target sequence.
6 *
7 * - `eq` , a line present in BOTH sides; consumes one line from the original
8 * and one from the target (they are equal).
9 * - `del` , a line present only in the original; consumes one line from the
10 * original (it is removed).
11 * - `ins` , a line present only in the target; consumes one line from the
12 * target (it is added).
13 *
14 * The engine works on `string[]` (one entry per line); {@link splitLines} /
15 * {@link joinLines} convert to and from a single text blob.
16 */
17
18 export type EditOp = "eq" | "del" | "ins";
19
20 /** A single edit-script entry: an operation paired with the line it concerns. */
21 export interface Edit {
22 op: EditOp;
23 /** For `eq`/`del` this is the original line; for `ins` it is the new line. */
24 line: string;
25 }
26
27 /** Aggregate counts over an edit script (handy for tests and stats). */
28 export interface DiffStats {
29 eq: number;
30 del: number;
31 ins: number;
32 }
331 import type { Edit } from "./types.js";
2
3 /**
4 * Compute the canonical minimal line-level edit script transforming `a` into `b`.
5 *
6 * Return an ordered `Edit[]` that, replayed against `a` by `applyPatch`,
7 * reproduces `b`. An `eq` consumes one line from each side (the lines are
8 * equal); a `del` consumes one line from `a`; an `ins` consumes one line from
9 * `b`. (See `EditOp` in types.ts.) The script must satisfy ALL THREE of the
10 * following; each is checked independently and validity + minimality is NOT
11 * sufficient.
12 *
13 * 1. VALID , `applyPatch(a, diff(a, b))` deep-equals `b`. Equivalently the
14 * `eq`+`del` lines (in order) equal `a`, the `eq`+`ins` lines equal `b`, and
15 * every `eq` carries a line equal to the one it consumes on each side.
16 * 2. MINIMAL , fewest non-`eq` ops of any valid script. With `C(a,b)` = the
17 * maximum achievable number of `eq` ops (the LCS length), the script has
18 * exactly `C(a,b)` `eq` ops and `a.length + b.length - 2*C(a,b)` non-`eq` ops.
19 * 3. CANONICAL , among the (often many) valid minimal scripts, return THE one
20 * defined below; the same `(a,b)` always yields it.
21 *
22 * The canonical script (the crux): read it left to right as an interleaving of
23 * `a` and `b`, walking cursors `(i, j)` from the start , `del` advances `i`,
24 * `ins` advances `j`, `eq` advances both (and requires `a[i] === b[j]`). Call an
25 * op *length-preserving at `(i, j)`* if, after taking it, the script can still be
26 * completed from the new position into a valid script meeting the clause-2
27 * minimality bound. At every step take the highest-priority length-preserving
28 * choice under this fixed priority:
29 * (1) `del` of `a[i]` if length-preserving at `(i, j)`;
30 * (2) else `ins` of `b[j]` if length-preserving at `(i, j)`;
31 * (3) else `eq` of the shared line (this case forces `a[i] === b[j]`).
32 * When `i` is at the end of `a` only `ins` remains; when `j` is at the end of
33 * `b` only `del` remains; when both are at the end the script ends.
34 *
35 * Edge cases: equal inputs -> all `eq`; empty `a` -> all `ins`; empty `b` -> all
36 * `del`; both empty -> `[]`. Lines compare by exact string equality only (no
37 * normalization/trimming); whitespace, tabs, emoji, combining chars and embedded
38 * newlines are opaque. A trailing newline shows up via `splitLines` as a final
39 * `""` and must be preserved; the empty string is `[""]` (length 1), never `[]`.
40 *
41 * Performance & memory: inputs may be large (up to ~1e5 lines) and are often
42 * largely identical (long shared runs at the start and/or end). Use memory
43 * proportional to the input size , allocating a full `n*m` table (Θ(n·m) memory)
44 * exhausts memory on large inputs and is graded as a failure. Small inputs may
45 * be handled any way; the constraint only bites at scale.
46 */
47 export function diff(a: string[], b: string[]): Edit[] {
48 // TODO(diff): implement the contract documented above. This stub throws so the
49 // engine is wired but non-functional; the suite must fail until implemented.
50 void a;
51 void b;
52 throw new Error("diff not implemented");
53 }
54ls src/diff && echo "---" && cat src/diff/*.ts | head -200
errors.ts
myers.ts
patch.ts
text.ts
types.ts
---
/**
* Typed errors for the diff/patch engine. A single class with a stable `code`
* discriminator keeps call sites and tests decoupled from message wording.
*/
export type PatchErrorCode =
| "context_mismatch"
| "unexpected_end"
| "trailing_lines"
| "unknown_op";
export class PatchError extends Error {
readonly code: PatchErrorCode;
constructor(code: PatchErrorCode, message: string) {
super(message);
this.name = "PatchError";
this.code = code;
Object.setPrototypeOf(this, PatchError.prototype);
}
}
import type { Edit } from "./types.js";
/**
* Compute the canonical minimal line-level edit script transforming `a` into `b`.
*
* Return an ordered `Edit[]` that, replayed against `a` by `applyPatch`,
* reproduces `b`. An `eq` consumes one line from each side (the lines are
* equal); a `del` consumes one line from `a`; an `ins` consumes one line from
* `b`. (See `EditOp` in types.ts.) The script must satisfy ALL THREE of the
* following; each is checked independently and validity + minimality is NOT
* sufficient.
*
* 1. VALID , `applyPatch(a, diff(a, b))` deep-equals `b`. Equivalently the
* `eq`+`del` lines (in order) equal `a`, the `eq`+`ins` lines equal `b`, and
* every `eq` carries a line equal to the one it consumes on each side.
* 2. MINIMAL , fewest non-`eq` ops of any valid script. With `C(a,b)` = the
* maximum achievable number of `eq` ops (the LCS length), the script has
* exactly `C(a,b)` `eq` ops and `a.length + b.length - 2*C(a,b)` non-`eq` ops.
* 3. CANONICAL , among the (often many) valid minimal scripts, return THE one
* defined below; the same `(a,b)` always yields it.
*
* The canonical script (the crux): read it left to right as an interleaving of
* `a` and `b`, walking cursors `(i, j)` from the start , `del` advances `i`,
* `ins` advances `j`, `eq` advances both (and requires `a[i] === b[j]`). Call an
* op *length-preserving at `(i, j)`* if, after taking it, the script can still be
* completed from the new position into a valid script meeting the clause-2
* minimality bound. At every step take the highest-priority length-preserving
* choice under this fixed priority:
* (1) `del` of `a[i]` if length-preserving at `(i, j)`;
* (2) else `ins` of `b[j]` if length-preserving at `(i, j)`;
* (3) else `eq` of the shared line (this case forces `a[i] === b[j]`).
* When `i` is at the end of `a` only `ins` remains; when `j` is at the end of
* `b` only `del` remains; when both are at the end the script ends.
*
* Edge cases: equal inputs -> all `eq`; empty `a` -> all `ins`; empty `b` -> all
* `del`; both empty -> `[]`. Lines compare by exact string equality only (no
* normalization/trimming); whitespace, tabs, emoji, combining chars and embedded
* newlines are opaque. A trailing newline shows up via `splitLines` as a final
* `""` and must be preserved; the empty string is `[""]` (length 1), never `[]`.
*
* Performance & memory: inputs may be large (up to ~1e5 lines) and are often
* largely identical (long shared runs at the start and/or end). Use memory
* proportional to the input size , allocating a full `n*m` table (Θ(n·m) memory)
* exhausts memory on large inputs and is graded as a failure. Small inputs may
* be handled any way; the constraint only bites at scale.
*/
export function diff(a: string[], b: string[]): Edit[] {
// TODO(diff): implement the contract documented above. This stub throws so the
// engine is wired but non-functional; the suite must fail until implemented.
void a;
void b;
throw new Error("diff not implemented");
}
import { PatchError } from "./errors.js";
import type { DiffStats, Edit } from "./types.js";
/**
* Apply an edit script to `original`, returning the patched line sequence.
*
* Replays the script left to right against a cursor into `original`:
*
* - `eq` , the next original line must EQUAL `edit.line`; emit it and advance
* the cursor. A mismatch (or running off the end) is a
* `PatchError("context_mismatch" | "unexpected_end")`: the patch does not
* apply to this input.
* - `del` , the next original line must equal `edit.line`; advance the cursor
* WITHOUT emitting (the line is removed). Same error rules as `eq`.
* - `ins` , emit `edit.line`; the cursor does NOT advance (nothing consumed
* from the original).
*
* After the script, every original line must have been consumed; leftover lines
* are a `PatchError("trailing_lines")`. An unrecognised op is
* `PatchError("unknown_op")`.
*
* This is the inverse of {@link diff}: for any `a`, `b`,
* `applyPatch(a, diff(a, b))` must deep-equal `b`. Provided complete , the diff
* you implement is validated against this applier.
*/
export function applyPatch(original: string[], edits: Edit[]): string[] {
const out: string[] = [];
let i = 0; // cursor into `original`
for (const edit of edits) {
switch (edit.op) {
case "eq": {
if (i >= original.length) {
throw new PatchError("unexpected_end", `eq past end of original at op consuming "${edit.line}"`);
}
if (original[i] !== edit.line) {
throw new PatchError(
"context_mismatch",
`eq mismatch at original line ${i}: expected "${edit.line}", found "${original[i]}"`,
);
}
out.push(original[i] as string);
i++;
break;
}
case "del": {
if (i >= original.length) {
throw new PatchError("unexpected_end", `del past end of original at op removing "${edit.line}"`);
}
if (original[i] !== edit.line) {
throw new PatchError(
"context_mismatch",
`del mismatch at original line ${i}: expected "${edit.line}", found "${original[i]}"`,
);
}
i++;
break;
}
case "ins": {
out.push(edit.line);
break;
}
default: {
throw new PatchError("unknown_op", `unknown edit op: ${String((edit as Edit).op)}`);
}
}
}
if (i !== original.length) {
throw new PatchError(
"trailing_lines",
`patch consumed ${i} of ${original.length} original lines; ${original.length - i} left over`,
);
}
return out;
}
/** Tally an edit script by op kind. Provided complete. */
export function diffStats(edits: Edit[]): DiffStats {
const stats: DiffStats = { eq: 0, del: 0, ins: 0 };
for (const e of edits) stats[e.op]++;
return stats;
}
/**
* Text <-> lines conversion for the diff engine.
*
* `splitLines` splits on "\n" and keeps every line as a separate entry. A
* trailing newline yields a final empty entry preserved by `joinLines`, so the
* round-trip `joinLines(splitLines(t)) === t` holds for any input (including the
* empty string, which becomes `[""]`).
*
* Provided complete.
*/
export function splitLines(text: string): string[] {
return text.split("\n");
}
export function joinLines(lines: string[]): string {
return lines.join("\n");
}
/**
* Types for the line-oriented diff + patch engine.
*
* A diff is an **edit script**: an ordered list of operations that, replayed
* against the original sequence of lines, reproduces the target sequence.
*
* - `eq` , a line present in BOTH sides; consumes one line from the original
* and one from the target (they are equal).
* - `del` , a line present only in the original; consumes one line from the
* original (it is removed).
* - `ins` , a line present only in the target; consumes one line from the
* target (it is added).
*
* The engine works on `string[]` (one entry per line); {@link splitLines} /
* {@link joinLines} convert to and from a single text blob.
*/
export type EditOp = "eq" | "del" | "ins";
/** A single edit-script entry: an operation paired with the line it concerns. */
export interface Edit {
op: EditOp;
/** For `eq`/`del` this is the original line; for `ins` it is the new line. */
line: string;
}
/** Aggregate counts over an edit script (handy for tests and stats). */cat package.json && echo "---TSCONFIG---" && cat tsconfig.json 2>/dev/null && echo "---TESTS---" && ls -R test tests 2>/dev/null; ls
{
"name": "diff-patch-engine",
"version": "0.2.0",
"private": true,
"description": "Line-oriented diff (minimal LCS edit script) and patch-apply engine.",
"type": "module",
"engines": {
"node": ">=20"
},
"scripts": {
"build": "tsc -p tsconfig.json",
"typecheck": "tsc -p tsconfig.json --noEmit",
"test": "vitest run",
"test:watch": "vitest"
},
"devDependencies": {
"@types/node": "20.14.10",
"typescript": "5.5.3",
"vitest": "1.6.0"
}
}
---TSCONFIG---
{
"compilerOptions": {
"target": "ES2022",
"module": "ESNext",
"moduleResolution": "Bundler",
"lib": ["ES2022"],
"types": ["node"],
"rootDir": ".",
"outDir": "dist",
"strict": true,
"noUnusedLocals": true,
"noUnusedParameters": true,
"noImplicitReturns": true,
"noFallthroughCasesInSwitch": true,
"exactOptionalPropertyTypes": false,
"esModuleInterop": true,
"forceConsistentCasingInFileNames": true,
"resolveJsonModule": true,
"skipLibCheck": true,
"verbatimModuleSyntax": false
},
"include": ["src", "test"],
"exclude": ["node_modules", "dist"]
}
---TESTS---
test:
patch.test.ts
README.md
node_modules
package-lock.json
package.json
src
test
tsconfig.json
vitest.config.tscat test/patch.test.ts
import { describe, expect, it } from "vitest";
import { applyPatch } from "../src/diff/patch.js";
import { PatchError } from "../src/diff/errors.js";
import type { Edit } from "../src/diff/types.js";
const E = (op: Edit["op"], line: string): Edit => ({ op, line });
// applyPatch is provided/complete; one round-trip + one error-path sanity is
// enough here. The diff suite exercises applyPatch heavily on every assertion.
describe("applyPatch (provided)", () => {
it("replays eq/del/ins to reconstruct the target", () => {
const original = ["a", "b", "c"];
const edits: Edit[] = [E("eq", "a"), E("del", "b"), E("ins", "x"), E("eq", "c")];
expect(applyPatch(original, edits)).toEqual(["a", "x", "c"]);
});
it("throws trailing_lines when the script leaves original lines unconsumed", () => {
try {
applyPatch(["a", "b"], [E("eq", "a")]);
throw new Error("expected throw");
} catch (err) {
expect((err as PatchError).code).toBe("trailing_lines");
}
});
});import type { Edit } from "./types.js";
/**
* Compute the canonical minimal line-level edit script transforming `a` into `b`.
*
* Return an ordered `Edit[]` that, replayed against `a` by `applyPatch`,
* reproduces `b`. An `eq` consumes one line from each side (the lines are
* equal); a `del` consumes one line from `a`; an `ins` consumes one line from
* `b`. (See `EditOp` in types.ts.) The script must satisfy ALL THREE of the
* following; each is checked independently and validity + minimality is NOT
* sufficient.
*
* 1. VALID , `applyPatch(a, diff(a, b))` deep-equals `b`. Equivalently the
* `eq`+`del` lines (in order) equal `a`, the `eq`+`ins` lines equal `b`, and
* every `eq` carries a line equal to the one it consumes on each side.
* 2. MINIMAL , fewest non-`eq` ops of any valid script. With `C(a,b)` = the
* maximum achievable number of `eq` ops (the LCS length), the script has
* exactly `C(a,b)` `eq` ops and `a.length + b.length - 2*C(a,b)` non-`eq` ops.
* 3. CANONICAL , among the (often many) valid minimal scripts, return THE one
* defined below; the same `(a,b)` always yields it.
*
* The canonical script (the crux): read it left to right as an interleaving of
* `a` and `b`, walking cursors `(i, j)` from the start , `del` advances `i`,
* `ins` advances `j`, `eq` advances both (and requires `a[i] === b[j]`). Call an
* op *length-preserving at `(i, j)`* if, after taking it, the script can still be
* completed from the new position into a valid script meeting the clause-2
* minimality bound. At every step take the highest-priority length-preserving
* choice under this fixed priority:
* (1) `del` of `a[i]` if length-preserving at `(i, j)`;
* (2) else `ins` of `b[j]` if length-preserving at `(i, j)`;
* (3) else `eq` of the shared line (this case forces `a[i] === b[j]`).
* When `i` is at the end of `a` only `ins` remains; when `j` is at the end of
* `b` only `del` remains; when both are at the end the script ends.
*
* Edge cases: equal inputs -> all `eq`; empty `a` -> all `ins`; empty `b` -> all
* `del`; both empty -> `[]`. Lines compare by exact string equality only (no
* normalization/trimming); whitespace, tabs, emoji, combining chars and embedded
* newlines are opaque. A trailing newline shows up via `splitLines` as a final
* `""` and must be preserved; the empty string is `[""]` (length 1), never `[]`.
*
* Performance & memory: inputs may be large (up to ~1e5 lines) and are often
* largely identical (long shared runs at the start and/or end). Use memory
* proportional to the input size , allocating a full `n*m` table (Θ(n·m) memory)
* exhausts memory on large inputs and is graded as a failure. Small inputs may
* be handled any way; the constraint only bites at scale.
*/
export function diff(a: string[], b: string[]): Edit[] {
const n = a.length;
const m = b.length;
const out: Edit[] = [];
// 1. Strip the common prefix: these lines are forced `eq` on every valid
// script and trimming them keeps the recursive work proportional to the
// differing region (linear memory on largely-identical inputs).
let lo = 0;
while (lo < n && lo < m && a[lo] === b[lo]) lo++;
for (let k = 0; k < lo; k++) out.push({ op: "eq", line: a[k] as string });
// 2. Strip the common suffix (down to, but not into, the trimmed prefix).
let hiA = n;
let hiB = m;
while (hiA > lo && hiB > lo && a[hiA - 1] === b[hiB - 1]) {
hiA--;
hiB--;
}
// 3. Resolve the differing core [lo,hiA) x [lo,hiB) into canonical ops.
canonical(a, b, lo, hiA, lo, hiB, out);
// 4. Re-emit the common suffix as `eq`.
for (let k = hiA; k < n; k++) out.push({ op: "eq", line: a[k] as string });
return out;
}
/**
* Emit the canonical edit ops aligning `a[i0:i1]` with `b[j0:j1]` into `out`.
*
* The canonical script is the lexicographically-smallest maximum-LCS alignment
* under the per-step priority del < ins < eq. We reconstruct it in O(rows+cols)
* memory via Hirschberg's divide-and-conquer: split the row range in half, find
* the column at which the optimal path crosses the split (choosing, among the
* optimal crossing columns, the one the del-first canonical path uses), and
* recurse on the two sub-rectangles.
*/
function canonical(
a: string[],
b: string[],
i0: number,
i1: number,
j0: number,
j1: number,
out: Edit[],
): void {
const rows = i1 - i0;
const cols = j1 - j0;
// No A rows left: every remaining B column is an insertion.
if (rows === 0) {
for (let j = j0; j < j1; j++) out.push({ op: "ins", line: b[j] as string });
return;
}
// No B columns left: every remaining A row is a deletion.
if (cols === 0) {
for (let i = i0; i < i1; i++) out.push({ op: "del", line: a[i] as string });
return;
}
// Single A row: align one line against a run of B columns.
if (rows === 1) {
alignRow(a, b, i0, j0, j1, out);
return;
}
// Single B column: align a run of A rows against one line.
if (cols === 1) {
alignCol(a, b, i0, i1, j0, out);
return;
}
// Divide: split the A rows in half.
const mid = (i0 + i1) >> 1;
// f[t] = LCS(a[i0:mid], b[j0:j0+t]) for t in [0, cols].
const f = prefixLcsRow(a, b, i0, mid, j0, j1);
// g[t] = LCS(a[mid:i1], b[j0+t:j1]) for t in [0, cols].
const g = suffixLcsRow(a, b, mid, i1, j0, j1);
// The optimal path crosses the row split at some column whose f[t]+g[t] is
// maximal. Many columns may tie; the del-first canonical path uses the
// smallest such column (it delays insertions, so it sits at the lowest column
// consistent with optimality when it reaches the split row).
let best = -1;
let bestT = 0;
for (let t = 0; t <= cols; t++) {
const s = (f[t] as number) + (g[t] as number);
if (s > best) {
best = s;
bestT = t;
}
}
const split = j0 + bestT;
canonical(a, b, i0, mid, j0, split, out);
canonical(a, b, mid, i1, split, j1, out);
}
/** Align a single A line `a[i0]` against `b[j0:j1]` canonically. */
function alignRow(
a: string[],
b: string[],
i0: number,
j0: number,
j1: number,
out: Edit[],
): void {
const x = a[i0] as string;
// First occurrence of x in b[j0:j1]: the canonical path inserts every column
// before it, matches there, then inserts the rest. If x is absent the line is
// deleted first (del is length-preserving), then all of b is inserted.
let p = -1;
for (let j = j0; j < j1; j++) {
if (b[j] === x) {
p = j;
break;
}
}
if (p === -1) {
out.push({ op: "del", line: x });
for (let j = j0; j < j1; j++) out.push({ op: "ins", line: b[j] as string });
return;
}
for (let j = j0; j < p; j++) out.push({ op: "ins", line: b[j] as string });
out.push({ op: "eq", line: x });
for (let j = p + 1; j < j1; j++) out.push({ op: "ins", line: b[j] as string });
}
/** Align a run of A lines `a[i0:i1]` against a single B line `b[j0]` canonically. */
function alignCol(
a: string[],
b: string[],
i0: number,
i1: number,
j0: number,
out: Edit[],
): void {
const y = b[j0] as string;
// Last occurrence of y in a[i0:i1]: the canonical path deletes every row up to
// it (del stays length-preserving while a later match remains), matches there,
// then deletes the rest. If y is absent, delete all of a then insert y.
let p = -1;
for (let i = i1 - 1; i >= i0; i--) {
if (a[i] === y) {
p = i;
break;
}
}
if (p === -1) {
for (let i = i0; i < i1; i++) out.push({ op: "del", line: a[i] as string });
out.push({ op: "ins", line: y });
return;
}
for (let i = i0; i < p; i++) out.push({ op: "del", line: a[i] as string });
out.push({ op: "eq", line: y });
for (let i = p + 1; i < i1; i++) out.push({ op: "del", line: a[i] as string });
}
/**
* Forward LCS row: returns an array `f` of length `(j1-j0)+1` where
* `f[t] = LCS(a[i0:i1], b[j0:j0+t])`. O(j1-j0) memory.
*/
function prefixLcsRow(
a: string[],
b: string[],
i0: number,
i1: number,
j0: number,
j1: number,
): Int32Array {
const width = j1 - j0;
let prev = new Int32Array(width + 1);
let curr = new Int32Array(width + 1);
for (let i = i0; i < i1; i++) {
const ai = a[i] as string;
curr[0] = 0;
for (let t = 1; t <= width; t++) {
const bj = b[j0 + t - 1] as string;
if (ai === bj) {
curr[t] = (prev[t - 1] as number) + 1;
} else {
const up = prev[t] as number;
const left = curr[t - 1] as number;
curr[t] = up >= left ? up : left;
}
}
const tmp = prev;
prev = curr;
curr = tmp;
}
return prev;
}
/**
* Backward LCS row: returns an array `g` of length `(j1-j0)+1` where
* `g[t] = LCS(a[i0:i1], b[j0+t:j1])`. O(j1-j0) memory.
*/
function suffixLcsRow(
a: string[],
b: string[],
i0: number,
i1: number,
j0: number,
j1: number,
): Int32Array {
const width = j1 - j0;
let prev = new Int32Array(width + 1);
let curr = new Int32Array(width + 1);
for (let i = i1 - 1; i >= i0; i--) {
const ai = a[i] as string;
curr[width] = 0;
for (let t = width - 1; t >= 0; t--) {
const bj = b[j0 + t] as string;
if (ai === bj) {
curr[t] = (prev[t + 1] as number) + 1;
} else {
const down = prev[t] as number;
const right = curr[t + 1] as number;
curr[t] = down >= right ? down : right;
}
}
const tmp = prev;
prev = curr;
curr = tmp;
}
return prev;
}
The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
import { diff } from "./src/diff/myers.ts";
import { applyPatch } from "./src/diff/patch.ts";
// Reference canonical via suffix-LCS DP + exact greedy from the spec.
function refCanonical(a, b) {
const n = a.length, m = b.length;
// L[i][j] = LCS(a[i:], b[j:])
const L = Array.from({ length: n + 1 }, () => new Int32Array(m + 1));
for (let i = n - 1; i >= 0; i--) {
for (let j = m - 1; j >= 0; j--) {
if (a[i] === b[j]) L[i][j] = L[i + 1][j + 1] + 1;
else L[i][j] = Math.max(L[i + 1][j], L[i][j + 1]);
}
}
const out = [];
let i = 0, j = 0;
while (i < n || j < m) {
if (i < n && j < m) {
// del length-preserving iff L[i+1][j] == L[i][j]
if (L[i + 1][j] === L[i][j]) {
out.push({ op: "del", line: a[i] }); i++;
} else if (L[i][j + 1] === L[i][j]) {
out.push({ op: "ins", line: b[j] }); j++;
} else {
out.push({ op: "eq", line: a[i] }); i++; j++;
}
} else if (i < n) {
// j at end: del only
out.push({ op: "del", line: a[i] }); i++;
} else {
out.push({ op: "ins", line: b[j] }); j++;
}
}
return out;
}
function eq(x, y) {
if (x.length !== y.length) return false;
for (let k = 0; k < x.length; k++) {
if (x[k].op !== y[k].op || x[k].line !== y[k].line) return false;
}
return true;
}
function randArr(maxLen, alpha) {
const len = Math.floor(Math.random() * (maxLen + 1));
const out = [];
for (let k = 0; k < len; k++) out.push(alpha[Math.floor(Math.random() * alpha.length)]);
return out;
}
let fails = 0;
const ALPH = ["a", "b", "c"];
for (let t = 0; t < 200000; t++) {
const a = randArr(6, ALPH);
const b = randArr(6, ALPH);
const got = diff(a, b);
const ref = refCanonical(a, b);
// validity
const applied = applyPatch(a, got);
if (JSON.stringify(applied) !== JSON.stringify(b)) {
console.log("INVALID", JSON.stringify(a), JSON.stringify(b));
fails++; if (fails > 10) break; continue;
}
if (!eq(got, ref)) {
console.log("MISMATCH");
console.log("a=", JSON.stringify(a), "b=", JSON.stringify(b));
console.log("got=", JSON.stringify(got.map(e => e.op + ":" + e.line)));
console.log("ref=", JSON.stringify(ref.map(e => e.op + ":" + e.line)));
fails++; if (fails > 10) break;
}
}
console.log(fails === 0 ? "ALL OK" : `FAILS=${fails}`);
File created successfully at: /home/user/app/scratch_validate.mjs (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -40 || node --experimental-strip-types scratch_validate.mjs 2>&1 | head -40
npm WARN exec The following package was not found and will be installed: tsx@4.22.4 MISMATCH a= ["c","a","b","b","c"] b= ["b","b","b","a","b","a"] got= ["del:c","del:a","eq:b","eq:b","del:c","ins:b","ins:a","ins:b","ins:a"] ref= ["del:c","del:a","ins:b","ins:b","eq:b","ins:a","eq:b","del:c","ins:a"] MISMATCH a= ["a","a"] b= ["a","c","b"] got= ["eq:a","del:a","ins:c","ins:b"] ref= ["del:a","eq:a","ins:c","ins:b"] MISMATCH a= ["b"] b= ["b","b","b"] got= ["eq:b","ins:b","ins:b"] ref= ["ins:b","ins:b","eq:b"] MISMATCH a= ["a","c","b","b","c","a"] b= ["a","c","c","b","c","a"] got= ["eq:a","eq:c","del:b","ins:c","eq:b","eq:c","eq:a"] ref= ["eq:a","ins:c","eq:c","del:b","eq:b","eq:c","eq:a"] MISMATCH a= ["a","c","a","c","a"] b= ["c","c","c"] got= ["del:a","eq:c","del:a","eq:c","del:a","ins:c"] ref= ["del:a","ins:c","eq:c","del:a","eq:c","del:a"] MISMATCH a= ["a"] b= ["a","c","b","b","a"] got= ["eq:a","ins:c","ins:b","ins:b","ins:a"] ref= ["ins:a","ins:c","ins:b","ins:b","eq:a"] MISMATCH a= ["c","a","a","b","c"] b= ["c"] got= ["eq:c","del:a","del:a","del:b","del:c"] ref= ["del:c","del:a","del:a","del:b","eq:c"] MISMATCH a= ["b","c"] b= ["b","b","c"] got= ["eq:b","ins:b","eq:c"] ref= ["ins:b","eq:b","eq:c"] MISMATCH a= ["b","a","b","c"] b= ["c","c","c","a"] got= ["del:b","del:a","del:b","eq:c","ins:c","ins:c","ins:a"] ref= ["del:b","del:a","del:b","ins:c","ins:c","eq:c","ins:a"] MISMATCH a= ["a","b","c","a","a","c"] b= ["a","b","b","b"] got= ["eq:a","eq:b","del:c","del:a","del:a","del:c","ins:b","ins:b"]
/home/user/app/src/diff/myers.ts
const n = a.length;
const m = b.length;
const out: Edit[] = [];
// 1. Strip the common prefix: these lines are forced `eq` on every valid
// script and trimming them keeps the recursive work proportional to the
// differing region (linear memory on largely-identical inputs).
let lo = 0;
while (lo < n && lo < m && a[lo] === b[lo]) lo++;
for (let k = 0; k < lo; k++) out.push({ op: "eq", line: a[k] as string });
// 2. Strip the common suffix (down to, but not into, the trimmed prefix).
let hiA = n;
let hiB = m;
while (hiA > lo && hiB > lo && a[hiA - 1] === b[hiB - 1]) {
hiA--;
hiB--;
}
// 3. Resolve the differing core [lo,hiA) x [lo,hiB) into canonical ops.
canonical(a, b, lo, hiA, lo, hiB, out);
// 4. Re-emit the common suffix as `eq`.
for (let k = hiA; k < n; k++) out.push({ op: "eq", line: a[k] as string });
return out; const n = a.length;
const m = b.length;
const out: Edit[] = [];
// Strip the common suffix: the canonical script always `eq`s a trailing common
// run (it pushes matches as late as possible, and the final matched pair can
// never be del/ins'd without losing minimality , by induction the whole run is
// `eq`). This is safe to trim and keeps work proportional to the differing
// region. NOTE: a common *prefix* is NOT safe to trim , the canonical form may
// re-match a prefix line against a later occurrence, so the core spans [0,hiX).
let hiA = n;
let hiB = m;
while (hiA > 0 && hiB > 0 && a[hiA - 1] === b[hiB - 1]) {
hiA--;
hiB--;
}
// Resolve the differing core [0,hiA) x [0,hiB) into canonical ops.
canonical(a, b, 0, hiA, 0, hiB, out);
// Re-emit the common suffix as `eq`.
for (let k = hiA; k < n; k++) out.push({ op: "eq", line: a[k] as string });
return out;The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -40
MISMATCH a= ["b","a","b","c","b"] b= ["c","a","c","c","a","a"] got= ["del:b","ins:c","eq:a","del:b","eq:c","del:b","ins:c","ins:a","ins:a"] ref= ["del:b","ins:c","eq:a","del:b","ins:c","eq:c","del:b","ins:a","ins:a"] MISMATCH a= ["c","c","a","c"] b= ["a","a"] got= ["del:c","del:c","eq:a","del:c","ins:a"] ref= ["del:c","del:c","ins:a","eq:a","del:c"] MISMATCH a= ["b","b","a","b","b"] b= ["a","a","a","a","c","c"] got= ["del:b","del:b","eq:a","del:b","del:b","ins:a","ins:a","ins:a","ins:c","ins:c"] ref= ["del:b","del:b","ins:a","ins:a","ins:a","eq:a","del:b","del:b","ins:c","ins:c"] MISMATCH a= ["a","c","a","c","a"] b= ["a","c","a","c","c"] got= ["eq:a","eq:c","eq:a","eq:c","del:a","ins:c"] ref= ["eq:a","eq:c","eq:a","ins:c","eq:c","del:a"] MISMATCH a= ["b","b","a","b","a"] b= ["a","b","b"] got= ["del:b","del:b","eq:a","eq:b","del:a","ins:b"] ref= ["del:b","del:b","eq:a","ins:b","eq:b","del:a"] MISMATCH a= ["b","a","a","c","c"] b= ["b","b","a","a"] got= ["eq:b","ins:b","eq:a","eq:a","del:c","del:c"] ref= ["ins:b","eq:b","eq:a","eq:a","del:c","del:c"] MISMATCH a= ["a","a","b","a"] b= ["b","c","b"] got= ["del:a","del:a","eq:b","del:a","ins:c","ins:b"] ref= ["del:a","del:a","ins:b","ins:c","eq:b","del:a"] MISMATCH a= ["b","b","a"] b= ["a","a","b","c"] got= ["del:b","del:b","eq:a","ins:a","ins:b","ins:c"] ref= ["del:b","del:b","ins:a","eq:a","ins:b","ins:c"] MISMATCH a= ["a","c","b"] b= ["c","c","a","c","c"] got= ["ins:c","ins:c","eq:a","eq:c","del:b","ins:c"] ref= ["ins:c","ins:c","eq:a","ins:c","eq:c","del:b"] MISMATCH a= ["c","a","b","c","a","a"] b= ["c","c","b","a","b","c"] got= ["eq:c","ins:c","ins:b","eq:a","eq:b","eq:c","del:a","del:a"] ref= ["ins:c","eq:c","ins:b","eq:a","eq:b","eq:c","del:a","del:a"]
/home/user/app/src/diff/myers.ts
let best = -1;
let bestT = 0;
for (let t = 0; t <= cols; t++) {
const s = (f[t] as number) + (g[t] as number);
if (s > best) {
best = s;
bestT = t;
}
} let best = -1;
let bestT = 0;
for (let t = 0; t <= cols; t++) {
const s = (f[t] as number) + (g[t] as number);
if (s >= best) {
best = s;
bestT = t;
}
}The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -40
MISMATCH a= ["b","b","b","c"] b= ["b","a","a","b"] got= ["eq:b","ins:a","ins:a","eq:b","del:b","del:c"] ref= ["del:b","eq:b","ins:a","ins:a","eq:b","del:c"] MISMATCH a= ["a","a","c","a","b","c"] b= ["c","a","a","c"] got= ["ins:c","eq:a","eq:a","del:c","del:a","del:b","eq:c"] ref= ["del:a","del:a","eq:c","ins:a","eq:a","del:b","eq:c"] MISMATCH a= ["b","a","a","a","a","c"] b= ["c","b","b","c","a","a"] got= ["ins:c","eq:b","ins:b","ins:c","eq:a","eq:a","del:a","del:a","del:c"] ref= ["ins:c","ins:b","eq:b","del:a","del:a","ins:c","eq:a","eq:a","del:c"] MISMATCH a= ["a","a","b","a","c","b"] b= ["c","a","c"] got= ["ins:c","eq:a","del:a","del:b","del:a","eq:c","del:b"] ref= ["del:a","del:a","del:b","ins:c","eq:a","eq:c","del:b"] MISMATCH a= ["a","a","a","a","a"] b= ["c","c","a","a","c"] got= ["ins:c","ins:c","eq:a","eq:a","ins:c","del:a","del:a","del:a"] ref= ["del:a","del:a","del:a","ins:c","ins:c","eq:a","eq:a","ins:c"] MISMATCH a= ["c","c","c","c","c"] b= ["a","a"] got= ["del:c","ins:a","ins:a","del:c","del:c","del:c","del:c"] ref= ["del:c","del:c","del:c","del:c","del:c","ins:a","ins:a"] MISMATCH a= ["b","b","b","a","b"] b= ["c","b","a","a","a","b"] got= ["ins:c","eq:b","ins:a","ins:a","del:b","del:b","eq:a","eq:b"] ref= ["del:b","del:b","ins:c","eq:b","ins:a","ins:a","eq:a","eq:b"] MISMATCH a= ["a","c","c"] b= ["b","a","b","b","b","c"] got= ["ins:b","eq:a","ins:b","ins:b","ins:b","del:c","eq:c"] ref= ["ins:b","eq:a","del:c","ins:b","ins:b","ins:b","eq:c"] MISMATCH a= ["a","a","a","c","b","b"] b= ["b","c","c"] got= ["del:a","ins:b","ins:c","del:a","del:a","eq:c","del:b","del:b"] ref= ["del:a","del:a","del:a","del:c","del:b","eq:b","ins:c","ins:c"] MISMATCH a= ["c","b","a","b"] b= ["b","c","c","c","b"] got= ["ins:b","eq:c","ins:c","ins:c","del:b","del:a","eq:b"] ref= ["del:c","eq:b","del:a","ins:c","ins:c","ins:c","eq:b"]
/home/user/app/src/diff/myers.ts
const s = (f[t] as number) + (g[t] as number);
if (s >= best) { const s = (f[t] as number) + (g[t] as number);
if (s > best) {The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -40
MISMATCH a= ["a","c"] b= ["c","c","b","a","b"] got= ["del:a","eq:c","ins:c","ins:b","ins:a","ins:b"] ref= ["del:a","ins:c","eq:c","ins:b","ins:a","ins:b"] MISMATCH a= ["a","a","b","a"] b= ["b","c","b","a","c"] got= ["del:a","del:a","eq:b","ins:c","ins:b","eq:a","ins:c"] ref= ["del:a","del:a","ins:b","ins:c","eq:b","eq:a","ins:c"] MISMATCH a= ["a","c","a","a"] b= ["a","c","b","c"] got= ["eq:a","eq:c","del:a","del:a","ins:b","ins:c"] ref= ["eq:a","ins:c","ins:b","eq:c","del:a","del:a"] MISMATCH a= ["a","b","b"] b= ["a","a","c","b","c"] got= ["eq:a","del:b","ins:a","ins:c","eq:b","ins:c"] ref= ["ins:a","eq:a","del:b","ins:c","eq:b","ins:c"] MISMATCH a= ["c","a","c","a","b"] b= ["b","b","a"] got= ["del:c","del:a","del:c","del:a","eq:b","ins:b","ins:a"] ref= ["del:c","del:a","del:c","del:a","ins:b","eq:b","ins:a"] MISMATCH a= ["b","c","b"] b= ["c","a","c","a","a","a"] got= ["del:b","eq:c","del:b","ins:a","ins:c","ins:a","ins:a","ins:a"] ref= ["del:b","ins:c","ins:a","eq:c","del:b","ins:a","ins:a","ins:a"] MISMATCH a= ["a","b","a","a","a","c"] b= ["c","b","b","c","c"] got= ["del:a","ins:c","eq:b","del:a","del:a","del:a","ins:b","ins:c","eq:c"] ref= ["del:a","ins:c","ins:b","eq:b","del:a","del:a","del:a","ins:c","eq:c"] MISMATCH a= ["c","a"] b= ["c","b","c"] got= ["eq:c","del:a","ins:b","ins:c"] ref= ["ins:c","ins:b","eq:c","del:a"] MISMATCH a= ["b","c"] b= ["a","b","b"] got= ["ins:a","eq:b","del:c","ins:b"] ref= ["ins:a","ins:b","eq:b","del:c"] MISMATCH a= ["b","b","a","b"] b= ["a","c","a"] got= ["del:b","del:b","eq:a","del:b","ins:c","ins:a"] ref= ["del:b","del:b","ins:a","ins:c","eq:a","del:b"]
/home/user/app/src/diff/myers.ts
const n = a.length;
const m = b.length;
const out: Edit[] = [];
// Strip the common suffix: the canonical script always `eq`s a trailing common
// run (it pushes matches as late as possible, and the final matched pair can
// never be del/ins'd without losing minimality , by induction the whole run is
// `eq`). This is safe to trim and keeps work proportional to the differing
// region. NOTE: a common *prefix* is NOT safe to trim , the canonical form may
// re-match a prefix line against a later occurrence, so the core spans [0,hiX).
let hiA = n;
let hiB = m;
while (hiA > 0 && hiB > 0 && a[hiA - 1] === b[hiB - 1]) {
hiA--;
hiB--;
}
// Resolve the differing core [0,hiA) x [0,hiB) into canonical ops.
canonical(a, b, 0, hiA, 0, hiB, out);
// Re-emit the common suffix as `eq`.
for (let k = hiA; k < n; k++) out.push({ op: "eq", line: a[k] as string });
return out; const n = a.length;
const m = b.length;
const out: Edit[] = [];
// Strip the common prefix and suffix. Eq-ing a common run is always part of
// SOME minimal (max-LCS) script, so trimming yields a valid minimal alignment
// skeleton and keeps the recursive LCS work proportional to the differing
// core. It is NOT necessarily the canonical alignment (the canonical form may
// re-match a trimmed line against a later occurrence); the normalization pass
// below slides ops to recover the unique canonical script.
let lo = 0;
while (lo < n && lo < m && a[lo] === b[lo]) lo++;
for (let k = 0; k < lo; k++) out.push({ op: "eq", line: a[k] as string });
let hiA = n;
let hiB = m;
while (hiA > lo && hiB > lo && a[hiA - 1] === b[hiB - 1]) {
hiA--;
hiB--;
}
// Resolve the differing core [lo,hiA) x [lo,hiB) into a minimal alignment.
canonical(a, b, lo, hiA, lo, hiB, out);
// Re-emit the common suffix as `eq`.
for (let k = hiA; k < n; k++) out.push({ op: "eq", line: a[k] as string });
// Normalize to the unique canonical script (priority del < ins < eq).
normalize(out);
return out;The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
/home/user/app/src/diff/myers.ts
/** Align a single A line `a[i0]` against `b[j0:j1]` canonically. */
/**
* Rewrite a valid minimal alignment in place into the unique canonical script.
*
* Canonical = lexicographically smallest under op priority del < ins < eq read
* left to right. Any minimal alignment reaches it via repeated value-preserving
* adjacent swaps, each moving a higher-priority op earlier:
* A. [ins y, del x] -> [del x, ins y] (del < ins; always)
* B. [eq c, del x] when x==c -> [del x, eq c] (del < eq)
* C. [eq c, ins y] when y==c -> [ins y, eq c] (ins < eq)
* Each swap leaves applyPatch's result unchanged and preserves op counts.
*/
function normalize(ops: Edit[]): void {
// Repeated left-to-right bubble passes until a pass makes no swap. (Replaced by
// a linear scan in practice; correctness-equivalent fixpoint.)
let changed = true;
while (changed) {
changed = false;
for (let k = 0; k + 1 < ops.length; k++) {
const p = ops[k] as Edit;
const q = ops[k + 1] as Edit;
let swap = false;
if (p.op === "ins" && q.op === "del") swap = true;
else if (p.op === "eq" && q.op === "del" && q.line === p.line) swap = true;
else if (p.op === "eq" && q.op === "ins" && q.line === p.line) swap = true;
if (swap) {
ops[k] = q;
ops[k + 1] = p;
changed = true;
}
}
}
}
/** Align a single A line `a[i0]` against `b[j0:j1]` canonically. */The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -40
MISMATCH a= ["b","a"] b= ["c","c","b","b","b","b"] got= ["ins:c","ins:c","eq:b","del:a","ins:b","ins:b","ins:b"] ref= ["ins:c","ins:c","ins:b","ins:b","ins:b","eq:b","del:a"] MISMATCH a= ["a","c","b"] b= ["c","c","c","c"] got= ["del:a","eq:c","del:b","ins:c","ins:c","ins:c"] ref= ["del:a","ins:c","ins:c","ins:c","eq:c","del:b"] MISMATCH a= ["a","c","b"] b= ["a","b","c","a","c"] got= ["eq:a","del:c","eq:b","ins:c","ins:a","ins:c"] ref= ["ins:a","ins:b","ins:c","eq:a","eq:c","del:b"] MISMATCH a= ["b","b","a","a","c","b"] b= ["a","c","a","a","a","c"] got= ["del:b","del:b","eq:a","ins:c","ins:a","ins:a","eq:a","eq:c","del:b"] ref= ["del:b","del:b","ins:a","ins:c","ins:a","eq:a","eq:a","eq:c","del:b"] MISMATCH a= ["b","b","a","b"] b= ["b"] got= ["del:b","eq:b","del:a","del:b"] ref= ["del:b","del:b","del:a","eq:b"] MISMATCH a= ["b","c","a"] b= ["b","b"] got= ["eq:b","del:c","del:a","ins:b"] ref= ["ins:b","eq:b","del:c","del:a"] MISMATCH a= ["a","b","a","a","a","c"] b= ["a","c"] got= ["eq:a","del:b","del:a","del:a","del:a","eq:c"] ref= ["del:a","del:b","del:a","del:a","eq:a","eq:c"] MISMATCH a= ["c"] b= ["c","b","c"] got= ["eq:c","ins:b","ins:c"] ref= ["ins:c","ins:b","eq:c"] MISMATCH a= ["b","c"] b= ["a","b","b","a"] got= ["ins:a","eq:b","del:c","ins:b","ins:a"] ref= ["ins:a","ins:b","eq:b","del:c","ins:a"] MISMATCH a= ["a","c","c","a"] b= ["a","b"] got= ["eq:a","del:c","del:c","del:a","ins:b"] ref= ["del:a","del:c","del:c","eq:a","ins:b"]
/home/user/app/src/diff/myers.ts
const x = a[i0] as string;
// First occurrence of x in b[j0:j1]: the canonical path inserts every column
// before it, matches there, then inserts the rest. If x is absent the line is
// deleted first (del is length-preserving), then all of b is inserted.
let p = -1;
for (let j = j0; j < j1; j++) {
if (b[j] === x) {
p = j;
break;
}
} const x = a[i0] as string;
// Last occurrence of x in b[j0:j1]: the canonical path matches as late as
// possible, so it inserts every column before the final match, matches there,
// then inserts the rest. If x is absent the line is deleted first (del is
// length-preserving), then all of b is inserted.
let p = -1;
for (let j = j1 - 1; j >= j0; j--) {
if (b[j] === x) {
p = j;
break;
}
}The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
cp src/diff/myers.ts /tmp/myers_backup.ts
# Make a test variant: no prefix trim, no normalize
python3 - <<'EOF'
import re
s=open('src/diff/myers.ts').read()
# disable prefix trim: set lo=0 and skip prefix eq emission
s2=s.replace(
''' let lo = 0;
while (lo < n && lo < m && a[lo] === b[lo]) lo++;
for (let k = 0; k < lo; k++) out.push({ op: "eq", line: a[k] as string });''',
''' let lo = 0;''')
s2=s2.replace(''' // Normalize to the unique canonical script (priority del < ins < eq).
normalize(out);
return out;''',''' return out;''')
open('/tmp/myers_test.ts','w').write(s2)
print("ok")
EOF
cp /tmp/myers_test.ts src/diff/myers.ts
# fix the noUnusedLocals for hiA usage of lo: lo still used. normalize now unused -> tsc would error but we run tsx not tsc
npx tsx scratch_validate.mjs 2>&1 | head -20
cp /tmp/myers_backup.ts src/diff/myers.tsok MISMATCH a= ["a","c","a"] b= ["a","a","a"] got= ["eq:a","del:c","ins:a","eq:a"] ref= ["ins:a","eq:a","del:c","eq:a"] MISMATCH a= ["a","c","b","a"] b= ["b","b"] got= ["del:a","del:c","eq:b","del:a","ins:b"] ref= ["del:a","del:c","ins:b","eq:b","del:a"] MISMATCH a= ["c","b","a","c"] b= ["c","c","c"] got= ["eq:c","del:b","del:a","ins:c","eq:c"] ref= ["ins:c","eq:c","del:b","del:a","eq:c"] MISMATCH a= ["a","b","a","c","b","b"] b= ["c","c","c"] got= ["del:a","del:b","del:a","eq:c","del:b","del:b","ins:c","ins:c"] ref= ["del:a","del:b","del:a","ins:c","ins:c","eq:c","del:b","del:b"] MISMATCH a= ["b","b","b","c","a"] b= ["c","c"] got= ["del:b","del:b","del:b","eq:c","del:a","ins:c"] ref= ["del:b","del:b","del:b","ins:c","eq:c","del:a"]
cp /tmp/myers_backup.ts src/diff/myers.ts && grep -n "alignRow\|last occ\|First occ\|Last occ" src/diff/myers.ts | head
114: alignRow(a, b, i0, j0, j1, out); 184:function alignRow( 193: // Last occurrence of x in b[j0:j1]: the canonical path matches as late as 224: // Last occurrence of y in a[i0:i1]: the canonical path deletes every row up to
/home/user/app/src/diff/myers.ts
152 *
153 * Canonical = lexicographically smallest under op priority del < ins < eq read
154 * left to right. Any minimal alignment reaches it via repeated value-preserving
155 * adjacent swaps, each moving a higher-priority op earlier:
156 * A. [ins y, del x] -> [del x, ins y] (del < ins; always)
157 * B. [eq c, del x] when x==c -> [del x, eq c] (del < eq)
158 * C. [eq c, ins y] when y==c -> [ins y, eq c] (ins < eq)
159 * Each swap leaves applyPatch's result unchanged and preserves op counts.
160 */
161 function normalize(ops: Edit[]): void {
162 // Repeated left-to-right bubble passes until a pass makes no swap. (Replaced by
163 // a linear scan in practice; correctness-equivalent fixpoint.)
164 let changed = true;
165 while (changed) {
166 changed = false;
167 for (let k = 0; k + 1 < ops.length; k++) {
168 const p = ops[k] as Edit;
169 const q = ops[k + 1] as Edit;
170 let swap = false;
171 if (p.op === "ins" && q.op === "del") swap = true;
172 else if (p.op === "eq" && q.op === "del" && q.line === p.line) swap = true;
173 else if (p.op === "eq" && q.op === "ins" && q.line === p.line) swap = true;
174 if (swap) {
175 ops[k] = q;
176 ops[k + 1] = p;
177 changed = true;
178 }
179 }
180 }
181 }
182
183 /** Align a single A line `a[i0]` against `b[j0:j1]` canonically. *//home/user/app/src/diff/myers.ts
* Canonical = lexicographically smallest under op priority del < ins < eq read
* left to right. Any minimal alignment reaches it via repeated value-preserving
* adjacent swaps, each moving a higher-priority op earlier:
* A. [ins y, del x] -> [del x, ins y] (del < ins; always)
* B. [eq c, del x] when x==c -> [del x, eq c] (del < eq)
* C. [eq c, ins y] when y==c -> [ins y, eq c] (ins < eq)
* Each swap leaves applyPatch's result unchanged and preserves op counts.
*/
function normalize(ops: Edit[]): void {
// Repeated left-to-right bubble passes until a pass makes no swap. (Replaced by
// a linear scan in practice; correctness-equivalent fixpoint.)
let changed = true;
while (changed) {
changed = false;
for (let k = 0; k + 1 < ops.length; k++) {
const p = ops[k] as Edit;
const q = ops[k + 1] as Edit;
let swap = false;
if (p.op === "ins" && q.op === "del") swap = true;
else if (p.op === "eq" && q.op === "del" && q.line === p.line) swap = true;
else if (p.op === "eq" && q.op === "ins" && q.line === p.line) swap = true;
if (swap) {
ops[k] = q;
ops[k + 1] = p;
changed = true;
}
}
}
} * Canonical = lexicographically smallest under op priority del < ins < eq read
* left to right, i.e. every matched pair pushed as late as possible in both
* sequences. Any minimal alignment reaches it via value-preserving rewrites:
*
* A. [ins, del] -> [del, ins] (del < ins; reorder a run)
* B. eq(c) with a later del(c) reachable over a run of del-only ops:
* [eq c, del.., del c] -> [del c, del.., eq c] (match a later a-row)
* C. eq(c) with a later ins(c) reachable over a run of ins-only ops:
* [eq c, ins.., ins c] -> [ins c, ins.., eq c] (match a later b-line)
*
* In B/C the intervening ops consume only one side, so relocating the match to
* the later equal-valued line keeps every line consumed in order and leaves
* applyPatch's output unchanged. Each rewrite moves a higher-priority op earlier
* (B/C move the `eq` strictly later), so the process terminates at the unique
* canonical script.
*/
function normalize(ops: Edit[]): void {
let changed = true;
while (changed) {
changed = false;
// Reorder every maximal change block to put dels before ins (rule A).
for (let k = 0; k + 1 < ops.length; k++) {
const p = ops[k] as Edit;
const q = ops[k + 1] as Edit;
if (p.op === "ins" && q.op === "del") {
ops[k] = q;
ops[k + 1] = p;
changed = true;
}
}
// Push each match as late as possible (rules B and C). For an `eq(c)`,
// prefer relocating across a del-only run (later a-row) over an ins-only run
// (later b-line); del < ins, so a leading del run is what follows the eq once
// rule A has ordered the block.
for (let k = 0; k < ops.length; k++) {
const p = ops[k] as Edit;
if (p.op !== "eq") continue;
const c = p.line;
// Rule B: farthest del(c) reachable over del-only ops.
let target = -1;
for (let j = k + 1; j < ops.length && (ops[j] as Edit).op === "del"; j++) {
if ((ops[j] as Edit).line === c) target = j;
}
if (target !== -1) {
ops[k] = { op: "del", line: c };
ops[target] = { op: "eq", line: c };
changed = true;
continue;
}
// Rule C: farthest ins(c) reachable over ins-only ops.
target = -1;
for (let j = k + 1; j < ops.length && (ops[j] as Edit).op === "ins"; j++) {
if ((ops[j] as Edit).line === c) target = j;
}
if (target !== -1) {
ops[k] = { op: "ins", line: c };
ops[target] = { op: "eq", line: c };
changed = true;
}
}
}
}The file /home/user/app/src/diff/myers.ts has been updated successfully. (file state is current in your context , no need to Read it back)
npx tsx scratch_validate.mjs 2>&1 | head -30
MISMATCH a= ["a","a","a","c"] b= ["a","a","a","a","a"] got= ["eq:a","eq:a","eq:a","del:c","ins:a","ins:a"] ref= ["ins:a","ins:a","eq:a","eq:a","eq:a","del:c"] MISMATCH a= ["c","b","a"] b= ["b","b","b","b"] got= ["del:c","eq:b","del:a","ins:b","ins:b","ins:b"] ref= ["del:c","ins:b","ins:b","ins:b","eq:b","del:a"] MISMATCH a= ["a","c","a","c","c","a"] b= ["c","a","a","c","b","a"] got= ["del:a","eq:c","eq:a","del:c","ins:a","eq:c","ins:b","eq:a"] ref= ["del:a","eq:c","ins:a","eq:a","del:c","eq:c","ins:b","eq:a"] MISMATCH a= ["b","a","a"] b= ["b","b"] got= ["eq:b","del:a","del:a","ins:b"] ref= ["ins:b","eq:b","del:a","del:a"] MISMATCH a= ["b","c","a"] b= ["c","b","c","c","b"] got= ["ins:c","eq:b","eq:c","del:a","ins:c","ins:b"] ref= ["ins:c","eq:b","ins:c","eq:c","del:a","ins:b"] MISMATCH a= ["c","b","b","a","c","c"] b= ["c","c","b","c","c","b"] got= ["eq:c","del:b","ins:c","eq:b","del:a","eq:c","eq:c","ins:b"] ref= ["ins:c","eq:c","del:b","eq:b","del:a","eq:c","eq:c","ins:b"] MISMATCH a= ["c","a","a","b","a","a"] b= ["b","c","b","b","a"] got= ["ins:b","eq:c","del:a","del:a","eq:b","del:a","ins:b","eq:a"] ref= ["ins:b","eq:c","del:a","del:a","ins:b","eq:b","del:a","eq:a"] MISMATCH a= ["a","b","c","b"] b= ["a","a"]
No file changes, the agent left the workspace untouched.
=== running test suite in /home/user/app ===
RUN v1.6.0 /home/user/app
✓ test/diff.test.ts > diff > canonical edit scripts (pinned by the del-before-ins tie-break) > replace in the middle
✓ test/diff.test.ts > diff > canonical edit scripts (pinned by the del-before-ins tie-break) > a transposition keeps the LATER match and deletes the earlier line
✓ test/diff.test.ts > diff > canonical edit scripts (pinned by the del-before-ins tie-break) > duplicate runs align to the LAST surviving equal lines
✓ test/diff.test.ts > diff > canonical edit scripts (pinned by the del-before-ins tie-break) > interleaved unique deletions collapse to eq/del pairs
✓ test/diff.test.ts > diff > canonical edit scripts (pinned by the del-before-ins tie-break) > classic ABCABBA / CBABAC example resolves to the canonical script
✓ test/diff.test.ts > diff > round-trips through applyPatch on realistic text > patches a small source edit
✓ test/diff.test.ts > diff > round-trips through applyPatch on realistic text > preserves a trailing newline through split/diff/apply/join
× test/diff.test.ts > diff > canonical script , exhaustive over small inputs > matches the independent canonical oracle for every 2-letter pair up to length 5
→ expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
× test/diff.test.ts > diff > canonical script , exhaustive over small inputs > matches the independent canonical oracle for every 3-letter pair up to length 4
→ expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
× test/diff.test.ts > diff > adversarial: randomized exact-canonical differential > matches the canonical oracle across many longer, duplicate-heavy pairs
→ expected [ { op: 'ins', line: 'b' }, …(6) ] to deeply equal [ { op: 'ins', line: 'b' }, …(6) ]
× test/diff.test.ts > diff > adversarial: randomized exact-canonical differential > matches the canonical oracle on a binary alphabet (maximal ambiguity)
→ expected [ { op: 'del', line: '1' }, …(11) ] to deeply equal [ { op: 'del', line: '1' }, …(11) ]
✓ test/diff.test.ts > diff > adversarial: randomized exact-canonical differential > scales to a larger near-identical pair (single-line change)
✓ test/diff.test.ts > diff > performance: must stay within O(n*m) and produce the canonical script > diffs a 1500x1500 low-overlap pair well under the timeout
✓ test/diff.test.ts > diff > performance: must stay within O(n*m) and produce the canonical script > produces the canonical script on a 2000x2000 block-edit pair
✓ test/diff.test.ts > diff > tie-break orientation , extra hand-pinned litmus cases > reverse transposition still keeps the LATER match (del earlier copy first)
✓ test/diff.test.ts > diff > tie-break orientation , extra hand-pinned litmus cases > 3-cycle rotation resolves to the canonical del-before-ins script
✓ test/diff.test.ts > diff > tie-break orientation , extra hand-pinned litmus cases > a duplicated line that is removed keeps the LAST surviving copy
✓ test/diff.test.ts > diff > tie-break orientation , extra hand-pinned litmus cases > growing a run of duplicates inserts at the canonical position
✓ test/diff.test.ts > diff > tie-break orientation , extra hand-pinned litmus cases > symmetry is NOT assumed: diff(a,b) and diff(b,a) are independently canonical
✓ test/diff.test.ts > diff > adversarial edge cases > no common subsequence at all -> all del then all ins, in that order
✓ test/diff.test.ts > diff > adversarial edge cases > single-element equal / unequal
✓ test/diff.test.ts > diff > adversarial edge cases > very long common prefix with a single trailing change
✓ test/diff.test.ts > diff > adversarial edge cases > very long common suffix with a single leading change
✓ test/diff.test.ts > diff > adversarial edge cases > an all-identical block shrinks by deleting the surplus from the LEFT
✓ test/diff.test.ts > diff > adversarial edge cases > unicode, emoji, and whitespace-only lines compare by exact string equality
✓ test/diff.test.ts > diff > adversarial edge cases > lines that look like edit ops or contain newlines are treated opaquely
✓ test/diff.test.ts > diff > adversarial edge cases > combining-character vs precomposed forms are NOT equal (no normalization)
× test/diff.test.ts > diff > canonical script , WIDER exhaustive sweeps (cross-checked oracles) > matches both canonical oracles for every 2-letter pair up to length 6
→ expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
× test/diff.test.ts > diff > canonical script , WIDER exhaustive sweeps (cross-checked oracles) > matches both canonical oracles for every 3-letter pair up to length 5
→ expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
× test/diff.test.ts > diff > adversarial: LARGER randomized exact-canonical differential > matches both oracles across thousands of long, duplicate-heavy pairs
→ expected [ { op: 'del', line: 'a' }, …(18) ] to deeply equal [ { op: 'del', line: 'a' }, …(18) ]
× test/diff.test.ts > diff > adversarial: LARGER randomized exact-canonical differential > stays canonical with realistic line strings and block moves
→ expected [ …(55) ] to deeply equal [ …(55) ]
✓ test/diff.test.ts > diff > performance: an inefficient or super-quadratic approach times out > diffs a 2200x2200 low-overlap pair within a tight timeout
✓ test/diff.test.ts > diff > performance: an inefficient or super-quadratic approach times out > diffs a 3000x3000 block-edit pair within a tight timeout 404ms
× test/diff.test.ts > diff > canonical script , WIDEST exhaustive sweep (binary, length <= 7) > matches both canonical oracles for every 2-letter pair up to length 7
→ expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
✓ test/diff.test.ts > diff > deep tie-break chains , del-before-ins must hold across long runs > all-distinct replacement block: every del precedes every ins
✓ test/diff.test.ts > diff > deep tie-break chains , del-before-ins must hold across long runs > alternating shared/unique forces del-before-ins at each junction
✓ test/diff.test.ts > diff > deep tie-break chains , del-before-ins must hold across long runs > deletion defers to insertion exactly when deleting would break minimality
✓ test/diff.test.ts > diff > latest-anchor under heavy duplication , the later copy survives > shrinking a duplicate run deletes the LEFT surplus
✓ test/diff.test.ts > diff > latest-anchor under heavy duplication , the later copy survives > growing a duplicate run inserts BEFORE the surviving (later) anchor
✓ test/diff.test.ts > diff > latest-anchor under heavy duplication , the later copy survives > interleaved duplicates keep each latest viable anchor
✓ test/diff.test.ts > diff > latest-anchor under heavy duplication , the later copy survives > two distinct repeated lines interleaved keep their own latest anchors
× test/diff.test.ts > diff > adversarial: SECOND larger randomized exact-canonical differential > matches both oracles across many short-alphabet, duplicate-saturated pairs
→ expected [ { op: 'del', line: 'b' }, …(15) ] to deeply equal [ { op: 'del', line: 'b' }, …(15) ]
✓ test/diff.test.ts > diff > memory: large mostly-identical inputs must not build an n*m table > change at the START (long common suffix)
✓ test/diff.test.ts > diff > memory: large mostly-identical inputs must not build an n*m table > change at the END (long common prefix)
✓ test/diff.test.ts > diff > memory: large mostly-identical inputs must not build an n*m table > change in the MIDDLE (long common prefix AND suffix)
✓ test/diff.test.ts > diff > memory: large mostly-identical inputs must not build an n*m table > identical huge inputs -> all eq
✓ test/diff.test.ts > diff > more edge cases (added) > op-name strings ('eq'/'del'/'ins') as line content are opaque
× test/diff.test.ts > diff > more edge cases (added) > empty-string lines interspersed
→ expected [ { op: 'del', line: '' }, …(5) ] to deeply equal [ { op: 'del', line: '' }, …(5) ]
✓ test/diff.test.ts > diff > more edge cases (added) > whitespace-only lines that differ by kind
× test/diff.test.ts > diff > more edge cases (added) > lines containing embedded newlines are single opaque values
→ expected [ { op: 'eq', line: 'a\nb' }, …(3) ] to deeply equal [ { op: 'ins', line: 'a\nb' }, …(3) ]
✓ test/diff.test.ts > diff > more edge cases (added) > unicode: combining vs precomposed are distinct (no normalization)
✓ test/diff.test.ts > diff > more edge cases (added) > emoji ZWJ sequences are opaque strings
✓ test/diff.test.ts > diff > more edge cases (added) > b is the reverse of a
✓ test/diff.test.ts > diff > more edge cases (added) > difference is only trailing whitespace
✓ test/diff.test.ts > diff > more edge cases (added) > repeated block pattern, cyclically shifted
✓ test/diff.test.ts > diff > more edge cases (added) > long run of one value with a single mid insertion (latest anchor)
✓ test/diff.test.ts > diff > more edge cases (added) > JSON-looking duplicate lines align by latest anchor
✓ test/diff.test.ts > diff > more edge cases (added) > medium near-identical: one line changed among 60
✓ test/diff.test.ts > diff > large un-peelable cores: sub-quadratic memory AND exact canonical > disjoint halves bridged by a shared duplicate comb 3267ms
✓ test/diff.test.ts > diff > large un-peelable cores: sub-quadratic memory AND exact canonical > alternating (p,q) vs (q,p) at scale 3807ms
✓ test/diff.test.ts > diff > large un-peelable cores: sub-quadratic memory AND exact canonical > peelable unique affixes around a large duplicate mid-core 1760ms
✓ test/diff.test.ts > diff > more hardening edge cases (added) > highly skewed sizes: one line vs a large block, single match
✓ test/diff.test.ts > diff > more hardening edge cases (added) > trailing newline (final empty entry) is matched as eq at scale
✓ test/diff.test.ts > diff > more hardening edge cases (added) > deep alternating shared/unique tie-break chain at scale
✓ test/diff.test.ts > diff > large ambiguous duplicate-heavy cores match the canonical script > linear-space oracle agrees with the n*m oracle on every 2-letter pair up to length 6 339ms
× test/diff.test.ts > diff > large ambiguous duplicate-heavy cores match the canonical script > diff matches the linear-space canonical oracle on large random small-alphabet pairs 19599ms
→ expected [ { op: 'ins', line: '1' }, …(20949) ] to deeply equal [ { op: 'ins', line: '1' }, …(20949) ]
✓ test/patch.test.ts > applyPatch (provided) > replays eq/del/ins to reconstruct the target
✓ test/patch.test.ts > applyPatch (provided) > throws trailing_lines when the script leaves original lines unconsumed
⎯⎯⎯⎯⎯⎯ Failed Tests 13 ⎯⎯⎯⎯⎯⎯⎯
FAIL test/diff.test.ts > diff > canonical script , exhaustive over small inputs > matches the independent canonical oracle for every 2-letter pair up to length 5
AssertionError: expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
- Expected
+ Received
Array [
Object {
"line": "a",
- "op": "ins",
- },
- Object {
- "line": "a",
"op": "eq",
},
Object {
"line": "b",
"op": "del",
+ },
+ Object {
+ "line": "a",
+ "op": "ins",
},
]
❯ test/diff.test.ts:406:25
404| const edits = diff(a, b);
405| expectValidMinimal(a, b, edits);
406| expect(edits).toEqual(canonicalScript(a, b));
| ^
407| checked++;
408| }
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FAIL test/diff.test.ts > diff > canonical script , exhaustive over small inputs > matches the independent canonical oracle for every 3-letter pair up to length 4
AssertionError: expected [ { op: 'eq', line: 'a' }, …(2) ] to deeply equal [ { op: 'ins', line: 'a' }, …(2) ]
- Expected
+ Received
Array [
Obje
… (truncated at 12,000 chars, full verifier log is in the trial artifacts)Reproduce this trial: git checkout 327c807 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_0e19174e9819437e. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_0e19174e9819437e · verifier authoritative; classifier explanatory.