{"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 ? mappings.length : idx;\n}\n\nfunction decodeInteger(mappings: string, pos: number, state: SourceMapSegment, j: number): number {\n  let value = 0;\n  let shift = 0;\n  let integer = 0;\n\n  do {\n    const c = mappings.charCodeAt(pos++);\n    integer = charToInt[c];\n    value |= (integer & 31) << shift;\n    shift += 5;\n  } while (integer & 32);\n\n  const shouldNegate = value & 1;\n  value >>>= 1;\n\n  if (shouldNegate) {\n    value = -0x80000000 | -value;\n  }\n\n  state[j] += value;\n  return pos;\n}\n\nfunction hasMoreVlq(mappings: string, i: number, length: number): boolean {\n  if (i >= length) return false;\n  return mappings.charCodeAt(i) !== comma;\n}\n\nfunction sort(line: SourceMapSegment[]) {\n  line.sort(sortComparator);\n}\n\nfunction sortComparator(a: SourceMapSegment, b: SourceMapSegment): number {\n  return a[0] - b[0];\n}\n\nexport function encode(decoded: SourceMapMappings): string;\nexport function encode(decoded: Readonly<SourceMapMappings>): string;\nexport function encode(decoded: Readonly<SourceMapMappings>): string {\n  const state: [number, number, number, number, number] = new Int32Array(5) as any;\n  const bufLength = 1024 * 16;\n  const subLength = bufLength - 36;\n  const buf = new Uint8Array(bufLength);\n  const sub = buf.subarray(0, subLength);\n  let pos = 0;\n  let out = '';\n\n  for (let i = 0; i < decoded.length; i++) {\n    const line = decoded[i];\n    if (i > 0) {\n      if (pos === bufLength) {\n        out += td.decode(buf);\n        pos = 0;\n      }\n      buf[pos++] = semicolon;\n    }\n    if (line.length === 0) continue;\n\n    state[0] = 0;\n\n    for (let j = 0; j < line.length; j++) {\n      const segment = line[j];\n      // We can push up to 5 ints, each int can take at most 7 chars, and we\n      // may push a comma.\n      if (pos > subLength) {\n        out += td.decode(sub);\n        buf.copyWithin(0, subLength, pos);\n        pos -= subLength;\n      }\n      if (j > 0) buf[pos++] = comma;\n\n      pos = encodeInteger(buf, pos, state, segment, 0); // genColumn\n\n      if (segment.length === 1) continue;\n      pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex\n      pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine\n      pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn\n\n      if (segment.length === 4) continue;\n      pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex\n    }\n  }\n\n  return out + td.decode(buf.subarray(0, pos));\n}\n\nfunction encodeInteger(\n  buf: Uint8Array,\n  pos: number,\n  state: SourceMapSegment,\n  segment: SourceMapSegment,\n  j: number,\n): number {\n  const next = segment[j];\n  let num = next - state[j];\n  state[j] = next;\n\n  num = num < 0 ? 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