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11 KiB
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{"version":3,"file":"sourcemap-codec.mjs","sources":["../src/sourcemap-codec.ts"],"sourcesContent":["export type SourceMapSegment =\n | [number]\n | [number, number, number, number]\n | [number, number, number, number, number];\nexport type SourceMapLine = SourceMapSegment[];\nexport type SourceMapMappings = SourceMapLine[];\n\nconst comma = ','.charCodeAt(0);\nconst semicolon = ';'.charCodeAt(0);\nconst chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\nconst intToChar = new Uint8Array(64); // 64 possible chars.\nconst charToInt = new Uint8Array(128); // z is 122 in ASCII\n\nfor (let i = 0; i < chars.length; i++) {\n const c = chars.charCodeAt(i);\n intToChar[i] = c;\n charToInt[c] = i;\n}\n\n// Provide a fallback for older environments.\nconst td =\n typeof TextDecoder !== 'undefined'\n ? /* #__PURE__ */ new TextDecoder()\n : typeof Buffer !== 'undefined'\n ? {\n decode(buf: Uint8Array) {\n const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);\n return out.toString();\n },\n }\n : {\n decode(buf: Uint8Array) {\n let out = '';\n for (let i = 0; i < buf.length; i++) {\n out += String.fromCharCode(buf[i]);\n }\n return out;\n },\n };\n\nexport function decode(mappings: string): SourceMapMappings {\n const state: [number, number, number, number, number] = new Int32Array(5) as any;\n const decoded: SourceMapMappings = [];\n\n let index = 0;\n do {\n const semi = indexOf(mappings, index);\n const line: SourceMapLine = [];\n let sorted = true;\n let lastCol = 0;\n state[0] = 0;\n\n for (let i = index; i < semi; i++) {\n let seg: SourceMapSegment;\n\n i = decodeInteger(mappings, i, state, 0); // genColumn\n const col = state[0];\n if (col < lastCol) sorted = false;\n lastCol = col;\n\n if (hasMoreVlq(mappings, i, semi)) {\n i = decodeInteger(mappings, i, state, 1); // sourcesIndex\n i = decodeInteger(mappings, i, state, 2); // sourceLine\n i = decodeInteger(mappings, i, state, 3); // sourceColumn\n\n if (hasMoreVlq(mappings, i, semi)) {\n i = decodeInteger(mappings, i, state, 4); // namesIndex\n seg = [col, state[1], state[2], state[3], state[4]];\n } else {\n seg = [col, state[1], state[2], state[3]];\n }\n } else {\n seg = [col];\n }\n\n line.push(seg);\n }\n\n if (!sorted) sort(line);\n decoded.push(line);\n index = semi + 1;\n } while (index <= mappings.length);\n\n return decoded;\n}\n\nfunction indexOf(mappings: string, index: number): number {\n const idx = mappings.indexOf(';', index);\n return idx === -1 ? 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