mirror of
https://github.com/denoland/deno.git
synced 2024-11-30 16:40:57 -05:00
443 lines
12 KiB
TypeScript
443 lines
12 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
|
|
// This file was vendored from std/testing/_diff.ts
|
|
|
|
// TODO(petamoriken): enable prefer-primordials for node polyfills
|
|
// deno-lint-ignore-file prefer-primordials
|
|
|
|
import {
|
|
bgGreen,
|
|
bgRed,
|
|
bold,
|
|
gray,
|
|
green,
|
|
red,
|
|
white,
|
|
} from "ext:deno_node/_util/std_fmt_colors.ts";
|
|
|
|
interface FarthestPoint {
|
|
y: number;
|
|
id: number;
|
|
}
|
|
|
|
export enum DiffType {
|
|
removed = "removed",
|
|
common = "common",
|
|
added = "added",
|
|
}
|
|
|
|
export interface DiffResult<T> {
|
|
type: DiffType;
|
|
value: T;
|
|
details?: Array<DiffResult<T>>;
|
|
}
|
|
|
|
const REMOVED = 1;
|
|
const COMMON = 2;
|
|
const ADDED = 3;
|
|
|
|
function createCommon<T>(A: T[], B: T[], reverse?: boolean): T[] {
|
|
const common = [];
|
|
if (A.length === 0 || B.length === 0) return [];
|
|
for (let i = 0; i < Math.min(A.length, B.length); i += 1) {
|
|
if (
|
|
A[reverse ? A.length - i - 1 : i] === B[reverse ? B.length - i - 1 : i]
|
|
) {
|
|
common.push(A[reverse ? A.length - i - 1 : i]);
|
|
} else {
|
|
return common;
|
|
}
|
|
}
|
|
return common;
|
|
}
|
|
|
|
/**
|
|
* Renders the differences between the actual and expected values
|
|
* @param A Actual value
|
|
* @param B Expected value
|
|
*/
|
|
export function diff<T>(A: T[], B: T[]): Array<DiffResult<T>> {
|
|
const prefixCommon = createCommon(A, B);
|
|
const suffixCommon = createCommon(
|
|
A.slice(prefixCommon.length),
|
|
B.slice(prefixCommon.length),
|
|
true,
|
|
).reverse();
|
|
A = suffixCommon.length
|
|
? A.slice(prefixCommon.length, -suffixCommon.length)
|
|
: A.slice(prefixCommon.length);
|
|
B = suffixCommon.length
|
|
? B.slice(prefixCommon.length, -suffixCommon.length)
|
|
: B.slice(prefixCommon.length);
|
|
const swapped = B.length > A.length;
|
|
[A, B] = swapped ? [B, A] : [A, B];
|
|
const M = A.length;
|
|
const N = B.length;
|
|
if (!M && !N && !suffixCommon.length && !prefixCommon.length) return [];
|
|
if (!N) {
|
|
return [
|
|
...prefixCommon.map(
|
|
(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
|
|
),
|
|
...A.map(
|
|
(a): DiffResult<typeof a> => ({
|
|
type: swapped ? DiffType.added : DiffType.removed,
|
|
value: a,
|
|
}),
|
|
),
|
|
...suffixCommon.map(
|
|
(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
|
|
),
|
|
];
|
|
}
|
|
const offset = N;
|
|
const delta = M - N;
|
|
const size = M + N + 1;
|
|
const fp: FarthestPoint[] = Array.from(
|
|
{ length: size },
|
|
() => ({ y: -1, id: -1 }),
|
|
);
|
|
/**
|
|
* INFO:
|
|
* This buffer is used to save memory and improve performance.
|
|
* The first half is used to save route and last half is used to save diff
|
|
* type.
|
|
* This is because, when I kept new uint8array area to save type,performance
|
|
* worsened.
|
|
*/
|
|
const routes = new Uint32Array((M * N + size + 1) * 2);
|
|
const diffTypesPtrOffset = routes.length / 2;
|
|
let ptr = 0;
|
|
let p = -1;
|
|
|
|
function backTrace<T>(
|
|
A: T[],
|
|
B: T[],
|
|
current: FarthestPoint,
|
|
swapped: boolean,
|
|
): Array<{
|
|
type: DiffType;
|
|
value: T;
|
|
}> {
|
|
const M = A.length;
|
|
const N = B.length;
|
|
const result = [];
|
|
let a = M - 1;
|
|
let b = N - 1;
|
|
let j = routes[current.id];
|
|
let type = routes[current.id + diffTypesPtrOffset];
|
|
while (true) {
|
|
if (!j && !type) break;
|
|
const prev = j;
|
|
if (type === REMOVED) {
|
|
result.unshift({
|
|
type: swapped ? DiffType.removed : DiffType.added,
|
|
value: B[b],
|
|
});
|
|
b -= 1;
|
|
} else if (type === ADDED) {
|
|
result.unshift({
|
|
type: swapped ? DiffType.added : DiffType.removed,
|
|
value: A[a],
|
|
});
|
|
a -= 1;
|
|
} else {
|
|
result.unshift({ type: DiffType.common, value: A[a] });
|
|
a -= 1;
|
|
b -= 1;
|
|
}
|
|
j = routes[prev];
|
|
type = routes[prev + diffTypesPtrOffset];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function createFP(
|
|
slide: FarthestPoint,
|
|
down: FarthestPoint,
|
|
k: number,
|
|
M: number,
|
|
): FarthestPoint {
|
|
if (slide && slide.y === -1 && down && down.y === -1) {
|
|
return { y: 0, id: 0 };
|
|
}
|
|
if (
|
|
(down && down.y === -1) ||
|
|
k === M ||
|
|
(slide && slide.y) > (down && down.y) + 1
|
|
) {
|
|
const prev = slide.id;
|
|
ptr++;
|
|
routes[ptr] = prev;
|
|
routes[ptr + diffTypesPtrOffset] = ADDED;
|
|
return { y: slide.y, id: ptr };
|
|
} else {
|
|
const prev = down.id;
|
|
ptr++;
|
|
routes[ptr] = prev;
|
|
routes[ptr + diffTypesPtrOffset] = REMOVED;
|
|
return { y: down.y + 1, id: ptr };
|
|
}
|
|
}
|
|
|
|
function snake<T>(
|
|
k: number,
|
|
slide: FarthestPoint,
|
|
down: FarthestPoint,
|
|
_offset: number,
|
|
A: T[],
|
|
B: T[],
|
|
): FarthestPoint {
|
|
const M = A.length;
|
|
const N = B.length;
|
|
if (k < -N || M < k) return { y: -1, id: -1 };
|
|
const fp = createFP(slide, down, k, M);
|
|
while (fp.y + k < M && fp.y < N && A[fp.y + k] === B[fp.y]) {
|
|
const prev = fp.id;
|
|
ptr++;
|
|
fp.id = ptr;
|
|
fp.y += 1;
|
|
routes[ptr] = prev;
|
|
routes[ptr + diffTypesPtrOffset] = COMMON;
|
|
}
|
|
return fp;
|
|
}
|
|
|
|
while (fp[delta + offset].y < N) {
|
|
p = p + 1;
|
|
for (let k = -p; k < delta; ++k) {
|
|
fp[k + offset] = snake(
|
|
k,
|
|
fp[k - 1 + offset],
|
|
fp[k + 1 + offset],
|
|
offset,
|
|
A,
|
|
B,
|
|
);
|
|
}
|
|
for (let k = delta + p; k > delta; --k) {
|
|
fp[k + offset] = snake(
|
|
k,
|
|
fp[k - 1 + offset],
|
|
fp[k + 1 + offset],
|
|
offset,
|
|
A,
|
|
B,
|
|
);
|
|
}
|
|
fp[delta + offset] = snake(
|
|
delta,
|
|
fp[delta - 1 + offset],
|
|
fp[delta + 1 + offset],
|
|
offset,
|
|
A,
|
|
B,
|
|
);
|
|
}
|
|
return [
|
|
...prefixCommon.map(
|
|
(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
|
|
),
|
|
...backTrace(A, B, fp[delta + offset], swapped),
|
|
...suffixCommon.map(
|
|
(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
|
|
),
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Renders the differences between the actual and expected strings
|
|
* Partially inspired from https://github.com/kpdecker/jsdiff
|
|
* @param A Actual string
|
|
* @param B Expected string
|
|
*/
|
|
export function diffstr(A: string, B: string) {
|
|
function unescape(string: string): string {
|
|
// unescape invisible characters.
|
|
// ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#escape_sequences
|
|
return string
|
|
.replaceAll("\b", "\\b")
|
|
.replaceAll("\f", "\\f")
|
|
.replaceAll("\t", "\\t")
|
|
.replaceAll("\v", "\\v")
|
|
.replaceAll( // does not remove line breaks
|
|
/\r\n|\r|\n/g,
|
|
(str) => str === "\r" ? "\\r" : str === "\n" ? "\\n\n" : "\\r\\n\r\n",
|
|
);
|
|
}
|
|
|
|
function tokenize(string: string, { wordDiff = false } = {}): string[] {
|
|
if (wordDiff) {
|
|
// Split string on whitespace symbols
|
|
const tokens = string.split(/([^\S\r\n]+|[()[\]{}'"\r\n]|\b)/);
|
|
// Extended Latin character set
|
|
const words =
|
|
/^[a-zA-Z\u{C0}-\u{FF}\u{D8}-\u{F6}\u{F8}-\u{2C6}\u{2C8}-\u{2D7}\u{2DE}-\u{2FF}\u{1E00}-\u{1EFF}]+$/u;
|
|
|
|
// Join boundary splits that we do not consider to be boundaries and merge empty strings surrounded by word chars
|
|
for (let i = 0; i < tokens.length - 1; i++) {
|
|
if (
|
|
!tokens[i + 1] && tokens[i + 2] && words.test(tokens[i]) &&
|
|
words.test(tokens[i + 2])
|
|
) {
|
|
tokens[i] += tokens[i + 2];
|
|
tokens.splice(i + 1, 2);
|
|
i--;
|
|
}
|
|
}
|
|
return tokens.filter((token) => token);
|
|
} else {
|
|
// Split string on new lines symbols
|
|
const tokens = [], lines = string.split(/(\n|\r\n)/);
|
|
|
|
// Ignore final empty token when text ends with a newline
|
|
if (!lines[lines.length - 1]) {
|
|
lines.pop();
|
|
}
|
|
|
|
// Merge the content and line separators into single tokens
|
|
for (let i = 0; i < lines.length; i++) {
|
|
if (i % 2) {
|
|
tokens[tokens.length - 1] += lines[i];
|
|
} else {
|
|
tokens.push(lines[i]);
|
|
}
|
|
}
|
|
return tokens;
|
|
}
|
|
}
|
|
|
|
// Create details by filtering relevant word-diff for current line
|
|
// and merge "space-diff" if surrounded by word-diff for cleaner displays
|
|
function createDetails(
|
|
line: DiffResult<string>,
|
|
tokens: Array<DiffResult<string>>,
|
|
) {
|
|
return tokens.filter(({ type }) =>
|
|
type === line.type || type === DiffType.common
|
|
).map((result, i, t) => {
|
|
if (
|
|
(result.type === DiffType.common) && (t[i - 1]) &&
|
|
(t[i - 1]?.type === t[i + 1]?.type) && /\s+/.test(result.value)
|
|
) {
|
|
return {
|
|
...result,
|
|
type: t[i - 1].type,
|
|
};
|
|
}
|
|
return result;
|
|
});
|
|
}
|
|
|
|
// Compute multi-line diff
|
|
const diffResult = diff(
|
|
tokenize(`${unescape(A)}\n`),
|
|
tokenize(`${unescape(B)}\n`),
|
|
);
|
|
|
|
const added = [], removed = [];
|
|
for (const result of diffResult) {
|
|
if (result.type === DiffType.added) {
|
|
added.push(result);
|
|
}
|
|
if (result.type === DiffType.removed) {
|
|
removed.push(result);
|
|
}
|
|
}
|
|
|
|
// Compute word-diff
|
|
const aLines = added.length < removed.length ? added : removed;
|
|
const bLines = aLines === removed ? added : removed;
|
|
for (const a of aLines) {
|
|
let tokens = [] as Array<DiffResult<string>>,
|
|
b: undefined | DiffResult<string>;
|
|
// Search another diff line with at least one common token
|
|
while (bLines.length) {
|
|
b = bLines.shift();
|
|
tokens = diff(
|
|
tokenize(a.value, { wordDiff: true }),
|
|
tokenize(b?.value ?? "", { wordDiff: true }),
|
|
);
|
|
if (
|
|
tokens.some(({ type, value }) =>
|
|
type === DiffType.common && value.trim().length
|
|
)
|
|
) {
|
|
break;
|
|
}
|
|
}
|
|
// Register word-diff details
|
|
a.details = createDetails(a, tokens);
|
|
if (b) {
|
|
b.details = createDetails(b, tokens);
|
|
}
|
|
}
|
|
|
|
return diffResult;
|
|
}
|
|
|
|
/**
|
|
* Colors the output of assertion diffs
|
|
* @param diffType Difference type, either added or removed
|
|
*/
|
|
function createColor(
|
|
diffType: DiffType,
|
|
{ background = false } = {},
|
|
): (s: string) => string {
|
|
// TODO(@littledivy): Remove this when we can detect
|
|
// true color terminals.
|
|
// https://github.com/denoland/deno_std/issues/2575
|
|
background = false;
|
|
switch (diffType) {
|
|
case DiffType.added:
|
|
return (s: string): string =>
|
|
background ? bgGreen(white(s)) : green(bold(s));
|
|
case DiffType.removed:
|
|
return (s: string): string => background ? bgRed(white(s)) : red(bold(s));
|
|
default:
|
|
return white;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Prefixes `+` or `-` in diff output
|
|
* @param diffType Difference type, either added or removed
|
|
*/
|
|
function createSign(diffType: DiffType): string {
|
|
switch (diffType) {
|
|
case DiffType.added:
|
|
return "+ ";
|
|
case DiffType.removed:
|
|
return "- ";
|
|
default:
|
|
return " ";
|
|
}
|
|
}
|
|
|
|
export function buildMessage(
|
|
diffResult: ReadonlyArray<DiffResult<string>>,
|
|
{ stringDiff = false } = {},
|
|
): string[] {
|
|
const messages: string[] = [], diffMessages: string[] = [];
|
|
messages.push("");
|
|
messages.push("");
|
|
messages.push(
|
|
` ${gray(bold("[Diff]"))} ${red(bold("Actual"))} / ${
|
|
green(bold("Expected"))
|
|
}`,
|
|
);
|
|
messages.push("");
|
|
messages.push("");
|
|
diffResult.forEach((result: DiffResult<string>) => {
|
|
const c = createColor(result.type);
|
|
const line = result.details?.map((detail) =>
|
|
detail.type !== DiffType.common
|
|
? createColor(detail.type, { background: true })(detail.value)
|
|
: detail.value
|
|
).join("") ?? result.value;
|
|
diffMessages.push(c(`${createSign(result.type)}${line}`));
|
|
});
|
|
messages.push(...(stringDiff ? [diffMessages.join("")] : diffMessages));
|
|
messages.push("");
|
|
|
|
return messages;
|
|
}
|