mirror of
https://github.com/swc-project/swc.git
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343 lines
8.8 KiB
TypeScript
343 lines
8.8 KiB
TypeScript
// Loaded from https://deno.land/std@0.101.0/testing/_diff.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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interface FarthestPoint {
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y: number;
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id: number;
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}
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export enum DiffType {
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removed = "removed",
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common = "common",
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added = "added",
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}
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export interface DiffResult<T> {
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type: DiffType;
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value: T;
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details?: Array<DiffResult<T>>;
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}
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const REMOVED = 1;
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const COMMON = 2;
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const ADDED = 3;
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function createCommon<T>(A: T[], B: T[], reverse?: boolean): T[] {
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const common = [];
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if (A.length === 0 || B.length === 0) return [];
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for (let i = 0; i < Math.min(A.length, B.length); i += 1) {
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if (
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A[reverse ? A.length - i - 1 : i] === B[reverse ? B.length - i - 1 : i]
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) {
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common.push(A[reverse ? A.length - i - 1 : i]);
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} else {
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return common;
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}
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}
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return common;
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}
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/**
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* Renders the differences between the actual and expected values
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* @param A Actual value
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* @param B Expected value
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*/
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export function diff<T>(A: T[], B: T[]): Array<DiffResult<T>> {
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const prefixCommon = createCommon(A, B);
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const suffixCommon = createCommon(
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A.slice(prefixCommon.length),
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B.slice(prefixCommon.length),
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true,
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).reverse();
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A = suffixCommon.length
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? A.slice(prefixCommon.length, -suffixCommon.length)
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: A.slice(prefixCommon.length);
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B = suffixCommon.length
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? B.slice(prefixCommon.length, -suffixCommon.length)
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: B.slice(prefixCommon.length);
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const swapped = B.length > A.length;
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[A, B] = swapped ? [B, A] : [A, B];
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const M = A.length;
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const N = B.length;
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if (!M && !N && !suffixCommon.length && !prefixCommon.length) return [];
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if (!N) {
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return [
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...prefixCommon.map(
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(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
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),
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...A.map(
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(a): DiffResult<typeof a> => ({
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type: swapped ? DiffType.added : DiffType.removed,
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value: a,
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}),
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),
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...suffixCommon.map(
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(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
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),
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];
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}
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const offset = N;
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const delta = M - N;
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const size = M + N + 1;
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const fp = new Array(size).fill({ y: -1 });
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/**
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* INFO:
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* This buffer is used to save memory and improve performance.
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* The first half is used to save route and last half is used to save diff
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* type.
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* This is because, when I kept new uint8array area to save type,performance
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* worsened.
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*/
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const routes = new Uint32Array((M * N + size + 1) * 2);
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const diffTypesPtrOffset = routes.length / 2;
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let ptr = 0;
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let p = -1;
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function backTrace<T>(
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A: T[],
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B: T[],
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current: FarthestPoint,
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swapped: boolean,
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): Array<{
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type: DiffType;
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value: T;
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}> {
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const M = A.length;
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const N = B.length;
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const result = [];
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let a = M - 1;
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let b = N - 1;
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let j = routes[current.id];
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let type = routes[current.id + diffTypesPtrOffset];
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while (true) {
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if (!j && !type) break;
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const prev = j;
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if (type === REMOVED) {
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result.unshift({
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type: swapped ? DiffType.removed : DiffType.added,
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value: B[b],
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});
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b -= 1;
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} else if (type === ADDED) {
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result.unshift({
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type: swapped ? DiffType.added : DiffType.removed,
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value: A[a],
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});
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a -= 1;
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} else {
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result.unshift({ type: DiffType.common, value: A[a] });
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a -= 1;
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b -= 1;
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}
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j = routes[prev];
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type = routes[prev + diffTypesPtrOffset];
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}
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return result;
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}
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function createFP(
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slide: FarthestPoint,
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down: FarthestPoint,
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k: number,
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M: number,
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): FarthestPoint {
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if (slide && slide.y === -1 && down && down.y === -1) {
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return { y: 0, id: 0 };
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}
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if (
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(down && down.y === -1) ||
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k === M ||
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(slide && slide.y) > (down && down.y) + 1
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) {
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const prev = slide.id;
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ptr++;
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routes[ptr] = prev;
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routes[ptr + diffTypesPtrOffset] = ADDED;
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return { y: slide.y, id: ptr };
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} else {
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const prev = down.id;
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ptr++;
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routes[ptr] = prev;
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routes[ptr + diffTypesPtrOffset] = REMOVED;
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return { y: down.y + 1, id: ptr };
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}
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}
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function snake<T>(
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k: number,
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slide: FarthestPoint,
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down: FarthestPoint,
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_offset: number,
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A: T[],
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B: T[],
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): FarthestPoint {
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const M = A.length;
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const N = B.length;
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if (k < -N || M < k) return { y: -1, id: -1 };
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const fp = createFP(slide, down, k, M);
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while (fp.y + k < M && fp.y < N && A[fp.y + k] === B[fp.y]) {
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const prev = fp.id;
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ptr++;
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fp.id = ptr;
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fp.y += 1;
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routes[ptr] = prev;
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routes[ptr + diffTypesPtrOffset] = COMMON;
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}
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return fp;
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}
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while (fp[delta + offset].y < N) {
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p = p + 1;
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for (let k = -p; k < delta; ++k) {
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fp[k + offset] = snake(
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k,
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fp[k - 1 + offset],
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fp[k + 1 + offset],
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offset,
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A,
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B,
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);
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}
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for (let k = delta + p; k > delta; --k) {
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fp[k + offset] = snake(
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k,
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fp[k - 1 + offset],
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fp[k + 1 + offset],
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offset,
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A,
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B,
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);
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}
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fp[delta + offset] = snake(
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delta,
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fp[delta - 1 + offset],
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fp[delta + 1 + offset],
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offset,
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A,
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B,
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);
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}
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return [
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...prefixCommon.map(
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(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
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),
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...backTrace(A, B, fp[delta + offset], swapped),
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...suffixCommon.map(
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(c): DiffResult<typeof c> => ({ type: DiffType.common, value: c }),
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),
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];
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}
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/**
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* Renders the differences between the actual and expected strings
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* Partially inspired from https://github.com/kpdecker/jsdiff
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* @param A Actual string
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* @param B Expected string
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*/
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export function diffstr(A: string, B: string) {
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function tokenize(string: string, { wordDiff = false } = {}): string[] {
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if (wordDiff) {
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// Split string on whitespace symbols
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const tokens = string.split(/([^\S\r\n]+|[()[\]{}'"\r\n]|\b)/);
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// Extended Latin character set
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const words =
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/^[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;
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// Join boundary splits that we do not consider to be boundaries and merge empty strings surrounded by word chars
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for (let i = 0; i < tokens.length - 1; i++) {
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if (
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!tokens[i + 1] && tokens[i + 2] && words.test(tokens[i]) &&
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words.test(tokens[i + 2])
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) {
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tokens[i] += tokens[i + 2];
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tokens.splice(i + 1, 2);
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i--;
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}
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}
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return tokens.filter((token) => token);
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} else {
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// Split string on new lines symbols
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const tokens = [], lines = string.split(/(\n|\r\n)/);
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// Ignore final empty token when text ends with a newline
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if (!lines[lines.length - 1]) {
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lines.pop();
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}
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// Merge the content and line separators into single tokens
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for (let i = 0; i < lines.length; i++) {
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if (i % 2) {
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tokens[tokens.length - 1] += lines[i];
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} else {
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tokens.push(lines[i]);
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}
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}
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return tokens;
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}
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}
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// Create details by filtering revelant word-diff for current line
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// and merge "space-diff" if surrounded by word-diff for cleaner displays
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function createDetails(
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line: DiffResult<string>,
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tokens: Array<DiffResult<string>>,
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) {
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return tokens.filter(({ type }) =>
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type === line.type || type === DiffType.common
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).map((result, i, t) => {
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if (
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(result.type === DiffType.common) && (t[i - 1]) &&
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(t[i - 1]?.type === t[i + 1]?.type)
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) {
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result.type = t[i - 1].type;
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}
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return result;
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});
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}
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// Compute multi-line diff
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const diffResult = diff(tokenize(`${A}\n`), tokenize(`${B}\n`));
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const added = [], removed = [];
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for (const result of diffResult) {
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if (result.type === DiffType.added) {
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added.push(result);
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}
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if (result.type === DiffType.removed) {
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removed.push(result);
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}
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}
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// Compute word-diff
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const aLines = added.length < removed.length ? added : removed;
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const bLines = aLines === removed ? added : removed;
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for (const a of aLines) {
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let tokens = [] as Array<DiffResult<string>>,
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b: undefined | DiffResult<string>;
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// Search another diff line with at least one common token
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while (bLines.length) {
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b = bLines.shift();
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tokens = diff(
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tokenize(a.value, { wordDiff: true }),
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tokenize(b?.value ?? "", { wordDiff: true }),
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);
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if (
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tokens.some(({ type, value }) =>
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type === DiffType.common && value.trim().length
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)
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) {
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break;
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}
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}
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// Register word-diff details
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a.details = createDetails(a, tokens);
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if (b) {
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b.details = createDetails(b, tokens);
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}
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}
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return diffResult;
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}
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