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Viewing: sourcemap-codec.tar
LICENSE 0000644 00000002060 15120157335 0005551 0 ustar 00 The MIT License Copyright (c) 2015 Rich Harris Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. README.md 0000644 00000015311 15120157335 0006026 0 ustar 00 # sourcemap-codec Encode/decode the `mappings` property of a [sourcemap](https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit). ## Why? Sourcemaps are difficult to generate and manipulate, because the `mappings` property – the part that actually links the generated code back to the original source – is encoded using an obscure method called [Variable-length quantity](https://en.wikipedia.org/wiki/Variable-length_quantity). On top of that, each segment in the mapping contains offsets rather than absolute indices, which means that you can't look at a segment in isolation – you have to understand the whole sourcemap. This package makes the process slightly easier. ## Installation ```bash npm install sourcemap-codec ``` ## Usage ```js import { encode, decode } from 'sourcemap-codec'; var decoded = decode( ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' ); assert.deepEqual( decoded, [ // the first line (of the generated code) has no mappings, // as shown by the starting semi-colon (which separates lines) [], // the second line contains four (comma-separated) segments [ // segments are encoded as you'd expect: // [ generatedCodeColumn, sourceIndex, sourceCodeLine, sourceCodeColumn, nameIndex ] // i.e. the first segment begins at column 2, and maps back to the second column // of the second line (both zero-based) of the 0th source, and uses the 0th // name in the `map.names` array [ 2, 0, 2, 2, 0 ], // the remaining segments are 4-length rather than 5-length, // because they don't map a name [ 4, 0, 2, 4 ], [ 6, 0, 2, 5 ], [ 7, 0, 2, 7 ] ], // the final line contains two segments [ [ 2, 1, 10, 19 ], [ 12, 1, 11, 20 ] ] ]); var encoded = encode( decoded ); assert.equal( encoded, ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' ); ``` ## Benchmarks ``` node v18.0.0 amp.js.map - 45120 segments Decode Memory Usage: @jridgewell/sourcemap-codec 5479160 bytes sourcemap-codec 5659336 bytes source-map-0.6.1 17144440 bytes source-map-0.8.0 6867424 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 502 ops/sec ±1.03% (90 runs sampled) decode: sourcemap-codec x 445 ops/sec ±0.97% (92 runs sampled) decode: source-map-0.6.1 x 36.01 ops/sec ±1.64% (49 runs sampled) decode: source-map-0.8.0 x 367 ops/sec ±0.04% (95 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 1261620 bytes sourcemap-codec 9119248 bytes source-map-0.6.1 8968560 bytes source-map-0.8.0 8952952 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 738 ops/sec ±0.42% (98 runs sampled) encode: sourcemap-codec x 238 ops/sec ±0.73% (88 runs sampled) encode: source-map-0.6.1 x 162 ops/sec ±0.43% (84 runs sampled) encode: source-map-0.8.0 x 191 ops/sec ±0.34% (90 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** babel.min.js.map - 347793 segments Decode Memory Usage: @jridgewell/sourcemap-codec 35338184 bytes sourcemap-codec 35922736 bytes source-map-0.6.1 62366360 bytes source-map-0.8.0 44337416 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 40.35 ops/sec ±4.47% (54 runs sampled) decode: sourcemap-codec x 36.76 ops/sec ±3.67% (51 runs sampled) decode: source-map-0.6.1 x 4.44 ops/sec ±2.15% (16 runs sampled) decode: source-map-0.8.0 x 59.35 ops/sec ±0.05% (78 runs sampled) Fastest is decode: source-map-0.8.0 Encode Memory Usage: @jridgewell/sourcemap-codec 7212604 bytes sourcemap-codec 21421456 bytes source-map-0.6.1 25286888 bytes source-map-0.8.0 25498744 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 112 ops/sec ±0.13% (84 runs sampled) encode: sourcemap-codec x 30.23 ops/sec ±2.76% (53 runs sampled) encode: source-map-0.6.1 x 19.43 ops/sec ±3.70% (37 runs sampled) encode: source-map-0.8.0 x 19.40 ops/sec ±3.26% (37 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** preact.js.map - 1992 segments Decode Memory Usage: @jridgewell/sourcemap-codec 500272 bytes sourcemap-codec 516864 bytes source-map-0.6.1 1596672 bytes source-map-0.8.0 517272 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 16,137 ops/sec ±0.17% (99 runs sampled) decode: sourcemap-codec x 12,139 ops/sec ±0.13% (99 runs sampled) decode: source-map-0.6.1 x 1,264 ops/sec ±0.12% (100 runs sampled) decode: source-map-0.8.0 x 9,894 ops/sec ±0.08% (101 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 321026 bytes sourcemap-codec 830832 bytes source-map-0.6.1 586608 bytes source-map-0.8.0 586680 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 19,876 ops/sec ±0.78% (95 runs sampled) encode: sourcemap-codec x 6,983 ops/sec ±0.15% (100 runs sampled) encode: source-map-0.6.1 x 5,070 ops/sec ±0.12% (102 runs sampled) encode: source-map-0.8.0 x 5,641 ops/sec ±0.17% (100 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** react.js.map - 5726 segments Decode Memory Usage: @jridgewell/sourcemap-codec 734848 bytes sourcemap-codec 954200 bytes source-map-0.6.1 2276432 bytes source-map-0.8.0 955488 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 5,723 ops/sec ±0.12% (98 runs sampled) decode: sourcemap-codec x 4,555 ops/sec ±0.09% (101 runs sampled) decode: source-map-0.6.1 x 437 ops/sec ±0.11% (93 runs sampled) decode: source-map-0.8.0 x 3,441 ops/sec ±0.15% (100 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 638672 bytes sourcemap-codec 1109840 bytes source-map-0.6.1 1321224 bytes source-map-0.8.0 1324448 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 6,801 ops/sec ±0.48% (98 runs sampled) encode: sourcemap-codec x 2,533 ops/sec ±0.13% (101 runs sampled) encode: source-map-0.6.1 x 2,248 ops/sec ±0.08% (100 runs sampled) encode: source-map-0.8.0 x 2,303 ops/sec ±0.15% (100 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec ``` # License MIT dist/sourcemap-codec.mjs 0000644 00000012237 15120157335 0011302 0 ustar 00 const comma = ','.charCodeAt(0); const semicolon = ';'.charCodeAt(0); const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; const intToChar = new Uint8Array(64); // 64 possible chars. const charToInt = new Uint8Array(128); // z is 122 in ASCII for (let i = 0; i < chars.length; i++) { const c = chars.charCodeAt(i); intToChar[i] = c; charToInt[c] = i; } // Provide a fallback for older environments. const td = typeof TextDecoder !== 'undefined' ? /* #__PURE__ */ new TextDecoder() : typeof Buffer !== 'undefined' ? { decode(buf) { const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength); return out.toString(); }, } : { decode(buf) { let out = ''; for (let i = 0; i < buf.length; i++) { out += String.fromCharCode(buf[i]); } return out; }, }; function decode(mappings) { const state = new Int32Array(5); const decoded = []; let index = 0; do { const semi = indexOf(mappings, index); const line = []; let sorted = true; let lastCol = 0; state[0] = 0; for (let i = index; i < semi; i++) { let seg; i = decodeInteger(mappings, i, state, 0); // genColumn const col = state[0]; if (col < lastCol) sorted = false; lastCol = col; if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 1); // sourcesIndex i = decodeInteger(mappings, i, state, 2); // sourceLine i = decodeInteger(mappings, i, state, 3); // sourceColumn if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 4); // namesIndex seg = [col, state[1], state[2], state[3], state[4]]; } else { seg = [col, state[1], state[2], state[3]]; } } else { seg = [col]; } line.push(seg); } if (!sorted) sort(line); decoded.push(line); index = semi + 1; } while (index <= mappings.length); return decoded; } function indexOf(mappings, index) { const idx = mappings.indexOf(';', index); return idx === -1 ? mappings.length : idx; } function decodeInteger(mappings, pos, state, j) { let value = 0; let shift = 0; let integer = 0; do { const c = mappings.charCodeAt(pos++); integer = charToInt[c]; value |= (integer & 31) << shift; shift += 5; } while (integer & 32); const shouldNegate = value & 1; value >>>= 1; if (shouldNegate) { value = -0x80000000 | -value; } state[j] += value; return pos; } function hasMoreVlq(mappings, i, length) { if (i >= length) return false; return mappings.charCodeAt(i) !== comma; } function sort(line) { line.sort(sortComparator); } function sortComparator(a, b) { return a[0] - b[0]; } function encode(decoded) { const state = new Int32Array(5); const bufLength = 1024 * 16; const subLength = bufLength - 36; const buf = new Uint8Array(bufLength); const sub = buf.subarray(0, subLength); let pos = 0; let out = ''; for (let i = 0; i < decoded.length; i++) { const line = decoded[i]; if (i > 0) { if (pos === bufLength) { out += td.decode(buf); pos = 0; } buf[pos++] = semicolon; } if (line.length === 0) continue; state[0] = 0; for (let j = 0; j < line.length; j++) { const segment = line[j]; // We can push up to 5 ints, each int can take at most 7 chars, and we // may push a comma. if (pos > subLength) { out += td.decode(sub); buf.copyWithin(0, subLength, pos); pos -= subLength; } if (j > 0) buf[pos++] = comma; pos = encodeInteger(buf, pos, state, segment, 0); // genColumn if (segment.length === 1) continue; pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn if (segment.length === 4) continue; pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex } } return out + td.decode(buf.subarray(0, pos)); } function encodeInteger(buf, pos, state, segment, j) { const next = segment[j]; let num = next - state[j]; state[j] = next; num = num < 0 ? (-num << 1) | 1 : num << 1; do { let clamped = num & 0b011111; num >>>= 5; if (num > 0) clamped |= 0b100000; buf[pos++] = intToChar[clamped]; } while (num > 0); return pos; } export { decode, encode }; //# sourceMappingURL=sourcemap-codec.mjs.map dist/sourcemap-codec.mjs.map 0000644 00000013723 15120157335 0012057 0 ustar 00 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dist/sourcemap-codec.umd.js 0000644 00000014366 15120157335 0011716 0 ustar 00 (function (global, factory) { typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) : typeof define === 'function' && define.amd ? define(['exports'], factory) : (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.sourcemapCodec = {})); })(this, (function (exports) { 'use strict'; const comma = ','.charCodeAt(0); const semicolon = ';'.charCodeAt(0); const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; const intToChar = new Uint8Array(64); // 64 possible chars. const charToInt = new Uint8Array(128); // z is 122 in ASCII for (let i = 0; i < chars.length; i++) { const c = chars.charCodeAt(i); intToChar[i] = c; charToInt[c] = i; } // Provide a fallback for older environments. const td = typeof TextDecoder !== 'undefined' ? /* #__PURE__ */ new TextDecoder() : typeof Buffer !== 'undefined' ? { decode(buf) { const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength); return out.toString(); }, } : { decode(buf) { let out = ''; for (let i = 0; i < buf.length; i++) { out += String.fromCharCode(buf[i]); } return out; }, }; function decode(mappings) { const state = new Int32Array(5); const decoded = []; let index = 0; do { const semi = indexOf(mappings, index); const line = []; let sorted = true; let lastCol = 0; state[0] = 0; for (let i = index; i < semi; i++) { let seg; i = decodeInteger(mappings, i, state, 0); // genColumn const col = state[0]; if (col < lastCol) sorted = false; lastCol = col; if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 1); // sourcesIndex i = decodeInteger(mappings, i, state, 2); // sourceLine i = decodeInteger(mappings, i, state, 3); // sourceColumn if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 4); // namesIndex seg = [col, state[1], state[2], state[3], state[4]]; } else { seg = [col, state[1], state[2], state[3]]; } } else { seg = [col]; } line.push(seg); } if (!sorted) sort(line); decoded.push(line); index = semi + 1; } while (index <= mappings.length); return decoded; } function indexOf(mappings, index) { const idx = mappings.indexOf(';', index); return idx === -1 ? mappings.length : idx; } function decodeInteger(mappings, pos, state, j) { let value = 0; let shift = 0; let integer = 0; do { const c = mappings.charCodeAt(pos++); integer = charToInt[c]; value |= (integer & 31) << shift; shift += 5; } while (integer & 32); const shouldNegate = value & 1; value >>>= 1; if (shouldNegate) { value = -0x80000000 | -value; } state[j] += value; return pos; } function hasMoreVlq(mappings, i, length) { if (i >= length) return false; return mappings.charCodeAt(i) !== comma; } function sort(line) { line.sort(sortComparator); } function sortComparator(a, b) { return a[0] - b[0]; } function encode(decoded) { const state = new Int32Array(5); const bufLength = 1024 * 16; const subLength = bufLength - 36; const buf = new Uint8Array(bufLength); const sub = buf.subarray(0, subLength); let pos = 0; let out = ''; for (let i = 0; i < decoded.length; i++) { const line = decoded[i]; if (i > 0) { if (pos === bufLength) { out += td.decode(buf); pos = 0; } buf[pos++] = semicolon; } if (line.length === 0) continue; state[0] = 0; for (let j = 0; j < line.length; j++) { const segment = line[j]; // We can push up to 5 ints, each int can take at most 7 chars, and we // may push a comma. if (pos > subLength) { out += td.decode(sub); buf.copyWithin(0, subLength, pos); pos -= subLength; } if (j > 0) buf[pos++] = comma; pos = encodeInteger(buf, pos, state, segment, 0); // genColumn if (segment.length === 1) continue; pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn if (segment.length === 4) continue; pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex } } return out + td.decode(buf.subarray(0, pos)); } function encodeInteger(buf, pos, state, segment, j) { const next = segment[j]; let num = next - state[j]; state[j] = next; num = num < 0 ? (-num << 1) | 1 : num << 1; do { let clamped = num & 0b011111; num >>>= 5; if (num > 0) clamped |= 0b100000; buf[pos++] = intToChar[clamped]; } while (num > 0); return pos; } exports.decode = decode; exports.encode = encode; Object.defineProperty(exports, '__esModule', { value: true }); })); //# sourceMappingURL=sourcemap-codec.umd.js.map dist/sourcemap-codec.umd.js.map 0000644 00000014001 15120157335 0012454 0 ustar 00 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dist/types/sourcemap-codec.d.ts 0000644 00000000707 15120157335 0012524 0 ustar 00 export declare type SourceMapSegment = [number] | [number, number, number, number] | [number, number, number, number, number]; export declare type SourceMapLine = SourceMapSegment[]; export declare type SourceMapMappings = SourceMapLine[]; export declare function decode(mappings: string): SourceMapMappings; export declare function encode(decoded: SourceMapMappings): string; export declare function encode(decoded: Readonly<SourceMapMappings>): string; package.json 0000644 00000004371 15120157335 0007041 0 ustar 00 { "name": "@jridgewell/sourcemap-codec", "version": "1.4.14", "description": "Encode/decode sourcemap mappings", "keywords": [ "sourcemap", "vlq" ], "main": "dist/sourcemap-codec.umd.js", "module": "dist/sourcemap-codec.mjs", "typings": "dist/types/sourcemap-codec.d.ts", "files": [ "dist", "src" ], "exports": { ".": [ { "types": "./dist/types/sourcemap-codec.d.ts", "browser": "./dist/sourcemap-codec.umd.js", "import": "./dist/sourcemap-codec.mjs", "require": "./dist/sourcemap-codec.umd.js" }, "./dist/sourcemap-codec.umd.js" ], "./package.json": "./package.json" }, "scripts": { "benchmark": "run-s build:rollup benchmark:*", "benchmark:install": "cd benchmark && npm install", "benchmark:only": "node --expose-gc benchmark/index.js", "build": "run-s -n build:*", "build:rollup": "rollup -c rollup.config.js", "build:ts": "tsc --project tsconfig.build.json", "lint": "run-s -n lint:*", "lint:prettier": "npm run test:lint:prettier -- --write", "lint:ts": "npm run test:lint:ts -- --fix", "prebuild": "rm -rf dist", "prepublishOnly": "npm run preversion", "preversion": "run-s test build", "pretest": "run-s build:rollup", "test": "run-s -n test:lint test:only", "test:debug": "mocha --inspect-brk", "test:lint": "run-s -n test:lint:*", "test:lint:prettier": "prettier --check '{src,test}/**/*.ts'", "test:lint:ts": "eslint '{src,test}/**/*.ts'", "test:only": "mocha", "test:coverage": "c8 mocha", "test:watch": "mocha --watch" }, "repository": { "type": "git", "url": "git+https://github.com/jridgewell/sourcemap-codec.git" }, "author": "Rich Harris", "license": "MIT", "devDependencies": { "@rollup/plugin-typescript": "8.3.0", "@types/node": "17.0.15", "@typescript-eslint/eslint-plugin": "5.10.0", "@typescript-eslint/parser": "5.10.0", "benchmark": "2.1.4", "c8": "7.11.2", "eslint": "8.7.0", "eslint-config-prettier": "8.3.0", "mocha": "9.2.0", "npm-run-all": "4.1.5", "prettier": "2.5.1", "rollup": "2.64.0", "source-map": "0.6.1", "source-map-js": "1.0.2", "sourcemap-codec": "1.4.8", "typescript": "4.5.4" } } src/sourcemap-codec.ts 0000644 00000012464 15120157335 0010765 0 ustar 00 export type SourceMapSegment = | [number] | [number, number, number, number] | [number, number, number, number, number]; export type SourceMapLine = SourceMapSegment[]; export type SourceMapMappings = SourceMapLine[]; const comma = ','.charCodeAt(0); const semicolon = ';'.charCodeAt(0); const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; const intToChar = new Uint8Array(64); // 64 possible chars. const charToInt = new Uint8Array(128); // z is 122 in ASCII for (let i = 0; i < chars.length; i++) { const c = chars.charCodeAt(i); intToChar[i] = c; charToInt[c] = i; } // Provide a fallback for older environments. const td = typeof TextDecoder !== 'undefined' ? /* #__PURE__ */ new TextDecoder() : typeof Buffer !== 'undefined' ? { decode(buf: Uint8Array) { const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength); return out.toString(); }, } : { decode(buf: Uint8Array) { let out = ''; for (let i = 0; i < buf.length; i++) { out += String.fromCharCode(buf[i]); } return out; }, }; export function decode(mappings: string): SourceMapMappings { const state: [number, number, number, number, number] = new Int32Array(5) as any; const decoded: SourceMapMappings = []; let index = 0; do { const semi = indexOf(mappings, index); const line: SourceMapLine = []; let sorted = true; let lastCol = 0; state[0] = 0; for (let i = index; i < semi; i++) { let seg: SourceMapSegment; i = decodeInteger(mappings, i, state, 0); // genColumn const col = state[0]; if (col < lastCol) sorted = false; lastCol = col; if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 1); // sourcesIndex i = decodeInteger(mappings, i, state, 2); // sourceLine i = decodeInteger(mappings, i, state, 3); // sourceColumn if (hasMoreVlq(mappings, i, semi)) { i = decodeInteger(mappings, i, state, 4); // namesIndex seg = [col, state[1], state[2], state[3], state[4]]; } else { seg = [col, state[1], state[2], state[3]]; } } else { seg = [col]; } line.push(seg); } if (!sorted) sort(line); decoded.push(line); index = semi + 1; } while (index <= mappings.length); return decoded; } function indexOf(mappings: string, index: number): number { const idx = mappings.indexOf(';', index); return idx === -1 ? mappings.length : idx; } function decodeInteger(mappings: string, pos: number, state: SourceMapSegment, j: number): number { let value = 0; let shift = 0; let integer = 0; do { const c = mappings.charCodeAt(pos++); integer = charToInt[c]; value |= (integer & 31) << shift; shift += 5; } while (integer & 32); const shouldNegate = value & 1; value >>>= 1; if (shouldNegate) { value = -0x80000000 | -value; } state[j] += value; return pos; } function hasMoreVlq(mappings: string, i: number, length: number): boolean { if (i >= length) return false; return mappings.charCodeAt(i) !== comma; } function sort(line: SourceMapSegment[]) { line.sort(sortComparator); } function sortComparator(a: SourceMapSegment, b: SourceMapSegment): number { return a[0] - b[0]; } export function encode(decoded: SourceMapMappings): string; export function encode(decoded: Readonly<SourceMapMappings>): string; export function encode(decoded: Readonly<SourceMapMappings>): string { const state: [number, number, number, number, number] = new Int32Array(5) as any; const bufLength = 1024 * 16; const subLength = bufLength - 36; const buf = new Uint8Array(bufLength); const sub = buf.subarray(0, subLength); let pos = 0; let out = ''; for (let i = 0; i < decoded.length; i++) { const line = decoded[i]; if (i > 0) { if (pos === bufLength) { out += td.decode(buf); pos = 0; } buf[pos++] = semicolon; } if (line.length === 0) continue; state[0] = 0; for (let j = 0; j < line.length; j++) { const segment = line[j]; // We can push up to 5 ints, each int can take at most 7 chars, and we // may push a comma. if (pos > subLength) { out += td.decode(sub); buf.copyWithin(0, subLength, pos); pos -= subLength; } if (j > 0) buf[pos++] = comma; pos = encodeInteger(buf, pos, state, segment, 0); // genColumn if (segment.length === 1) continue; pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn if (segment.length === 4) continue; pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex } } return out + td.decode(buf.subarray(0, pos)); } function encodeInteger( buf: Uint8Array, pos: number, state: SourceMapSegment, segment: SourceMapSegment, j: number, ): number { const next = segment[j]; let num = next - state[j]; state[j] = next; num = num < 0 ? (-num << 1) | 1 : num << 1; do { let clamped = num & 0b011111; num >>>= 5; if (num > 0) clamped |= 0b100000; buf[pos++] = intToChar[clamped]; } while (num > 0); return pos; }
Coded With 💗 by
0x6ick