{
  "version": 3,
  "sources": ["../../lib/dashycode.ts"],
  "sourcesContent": ["/**\n * Dashycode!\n *\n * Encodes a string in a restricted string containing only alphanumeric\n * characters and dashes.\n *\n * (The name is a riff on Punycode, which is what I originally wanted\n * to use for this purpose, but it turns out Punycode does not work on\n * arbitrary strings.)\n *\n * @author Guangcong Luo <guangcongluo@gmail.com>\n * @license MIT\n */\n\nconst CODE_MAP = \"23456789abcdefghijkmnpqrstuvwxyz\";\nconst UNSAFE_MAP = \"!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~\";\n\n// chunk types:\n// 0b00 = 0x0 = block separator (\"wait until next dash\")\n// 0b01 = 0x1 = capitalize\n//   0b1_01 = 0x5 = specify capitalization of next 8 alphabetic chars of safe part (8 more bits)\n//   0b0_01 = 0x1 = short for 0b00000001_1_01 (capitalize first letter of next 8 alpha chars of safe part)\n// 0b10 = 0x2 = ASCII in UNSAFE_MAP (5 more bits)\n// 0b11 = 0x3 = other\n//   0b0_11 = 0x3 = space\n//   0b1_11 = 0x7 = UTF-16 (16 more bits)\n\n/**\n * An object representing a Dashycode bitstream.\n * The stream can be either a read stream or a write stream, but not\n * both simultaneously.\n */\ninterface DashyStream {\n\tcodeBuf: string;\n\tbuf: number;\n\tbufLength: number;\n}\n\nfunction streamWrite(stream: DashyStream, writeBufLength: number, writeBuf: number) {\n\tstream.buf += (writeBuf << stream.bufLength);\n\tstream.bufLength += writeBufLength;\n\twhile (stream.bufLength >= 5) {\n\t\tstream.codeBuf += CODE_MAP.charAt(stream.buf & 0x1F);\n\t\tstream.buf >>= 5;\n\t\tstream.bufLength -= 5;\n\t}\n}\n\nfunction streamGetCode(stream: DashyStream) {\n\tconst buf = stream.codeBuf + CODE_MAP.charAt(stream.buf);\n\n\t// truncate trailing `2`s (0b00000 chunks)\n\tlet end2Len = 0;\n\twhile (buf.charAt(buf.length - 1 - end2Len) === '2') end2Len++;\n\treturn end2Len ? buf.slice(0, -end2Len) : buf;\n}\n\nfunction streamPeek(stream: DashyStream, readLength: number, readMask: number = 0xFFFF >> (16 - readLength)) {\n\twhile (stream.bufLength < readLength && stream.codeBuf.length) {\n\t\tconst next5Bits = CODE_MAP.indexOf(stream.codeBuf.charAt(0));\n\t\tif (next5Bits < 0) throw new Error(\"Invalid character in coded buffer\");\n\t\tstream.codeBuf = stream.codeBuf.slice(1);\n\t\tstream.buf += next5Bits << stream.bufLength;\n\t\tstream.bufLength += 5;\n\t}\n\treturn stream.buf & readMask;\n}\n\nfunction streamRead(stream: DashyStream, readLength: number, readMask: number = 0xFFFF >> (16 - readLength)) {\n\tconst output = streamPeek(stream, readLength, readMask);\n\t// Note: bufLength can go negative! Streams have infinite trailing 0s\n\tstream.buf >>= readLength;\n\tstream.bufLength -= readLength;\n\treturn output;\n}\n\nexport function encode(str: string, allowCaps = false) {\n\tif (!str) return '0--0';\n\tlet safePart = '';\n\tconst unsafeStream: DashyStream = {\n\t\tcodeBuf: '',\n\t\tbuf: 0x0,\n\t\tbufLength: 0,\n\t};\n\tlet isSafe = true;\n\tlet alphaIndex = 0;\n\tlet capBuffer = 0x0;\n\tfor (let i = 0; i < str.length + 1; i++) {\n\t\tlet curCharCode = i !== str.length ? str.charCodeAt(i) : -1;\n\t\tconst isLowercase = (97 <= curCharCode && curCharCode <= 122); // a-z\n\t\tconst isUppercase = (65 <= curCharCode && curCharCode <= 90); // A-Z\n\t\tconst isNumeric = (48 <= curCharCode && curCharCode <= 57); // 0-9\n\t\tif (capBuffer && (\n\t\t\t!(isLowercase || isUppercase || isNumeric) ||\n\t\t\talphaIndex >= 8 ||\n\t\t\ti === str.length\n\t\t)) {\n\t\t\t// flush cap buffer\n\t\t\tif (capBuffer === 0xD) {\n\t\t\t\tstreamWrite(unsafeStream, 3, 0x1);\n\t\t\t} else {\n\t\t\t\tstreamWrite(unsafeStream, 11, capBuffer);\n\t\t\t}\n\t\t\talphaIndex -= 8;\n\t\t\tcapBuffer = 0x0;\n\t\t}\n\t\tif (i === str.length) break;\n\t\tif (isLowercase || isUppercase || isNumeric) {\n\t\t\tif (alphaIndex < 0) throw new Error(\"alphaIndex should be non-negative here\");\n\t\t\tif (!isSafe) {\n\t\t\t\tif (capBuffer) throw new Error(\"capBuffer shouldn't exist here\");\n\t\t\t\tstreamWrite(unsafeStream, 2, 0x0);\n\t\t\t\tisSafe = true;\n\t\t\t}\n\t\t\tif (isUppercase && !allowCaps) {\n\t\t\t\tsafePart += String.fromCharCode(curCharCode + 32);\n\t\t\t\twhile (alphaIndex >= 8) {\n\t\t\t\t\tif (capBuffer) throw new Error(\"capBuffer shouldn't exist here\");\n\t\t\t\t\talphaIndex -= 8;\n\t\t\t\t\tstreamWrite(unsafeStream, 11, 0x5);\n\t\t\t\t}\n\t\t\t\tif (!capBuffer) capBuffer = 0x5;\n\t\t\t\tcapBuffer += 1 << (alphaIndex + 3);\n\t\t\t} else {\n\t\t\t\tsafePart += str.charAt(i);\n\t\t\t}\n\t\t\tif (isUppercase || isLowercase) alphaIndex++;\n\t\t\tcontinue;\n\t\t}\n\t\tif (capBuffer) throw new Error(\"capBuffer shouldn't exist here\");\n\t\talphaIndex = 0;\n\t\tif (isSafe && curCharCode === 32) { // space\n\t\t\tconst nextCharCode = str.charCodeAt(i + 1);\n\t\t\tif ((97 <= nextCharCode && nextCharCode <= 122) || // a-z\n\t\t\t\t(65 <= nextCharCode && nextCharCode <= 90) || // A-Z\n\t\t\t\t(48 <= nextCharCode && nextCharCode <= 57)) { // 0-9\n\t\t\t\tsafePart += '-';\n\t\t\t\tstreamWrite(unsafeStream, 2, 0x0);\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t}\n\t\tif (isSafe) {\n\t\t\tsafePart += '-';\n\t\t\tisSafe = false;\n\t\t}\n\t\tlet unsafeMapIndex = -1;\n\t\tif (curCharCode === -1) {\n\t\t\tstreamWrite(unsafeStream, 2, 0x0);\n\t\t} else if (curCharCode === 32) { // space\n\t\t\tstreamWrite(unsafeStream, 3, 0x3);\n\t\t} else if ((unsafeMapIndex = UNSAFE_MAP.indexOf(str.charAt(i))) >= 0) {\n\t\t\tcurCharCode = (unsafeMapIndex << 2) + 0x2;\n\t\t\tstreamWrite(unsafeStream, 7, curCharCode);\n\t\t} else {\n\t\t\tcurCharCode = (curCharCode << 3) + 0x7;\n\t\t\tstreamWrite(unsafeStream, 19, curCharCode);\n\t\t}\n\t}\n\tlet unsafePart = streamGetCode(unsafeStream);\n\tif (safePart.startsWith('-')) {\n\t\tsafePart = safePart.slice(1);\n\t\tunsafePart = `${unsafePart}2`;\n\t}\n\tif (safePart.endsWith('-')) {\n\t\tsafePart = safePart.slice(0, -1);\n\t}\n\tif (!safePart) {\n\t\tsafePart = '0';\n\t\tunsafePart = `0${unsafePart}`;\n\t\tif (unsafePart.endsWith('2')) unsafePart = unsafePart.slice(0, -1);\n\t}\n\tif (!unsafePart) return safePart;\n\treturn `${safePart}--${unsafePart}`;\n}\n\nexport function decode(codedStr: string) {\n\tlet str = '';\n\tlet lastDashIndex = codedStr.lastIndexOf('--');\n\tif (lastDashIndex < 0) {\n\t\t// the regular decoder can also handle this case; but this should\n\t\t// be faster\n\t\treturn codedStr.replace(/-/g, ' ');\n\t}\n\tif (codedStr.charAt(lastDashIndex + 2) === '0') {\n\t\tif (!codedStr.startsWith('0') || lastDashIndex !== 1) {\n\t\t\tthrow new Error(\"Invalid Dashycode\");\n\t\t}\n\t\tlastDashIndex -= 1;\n\t\tcodedStr = '--' + codedStr.slice(4);\n\t}\n\tif (codedStr.endsWith('2')) {\n\t\tcodedStr = '-' + codedStr.slice(0, -1);\n\t\tlastDashIndex += 1;\n\t}\n\tconst unsafeStream: DashyStream = {\n\t\tcodeBuf: codedStr.slice(lastDashIndex + 2),\n\t\tbuf: 0x0,\n\t\tbufLength: 0,\n\t};\n\t/**\n\t * Status:\n\t * 1 : awaiting next read\n\t * 0 : assume all-lowercase\n\t * other: 1 followed by n bits, describing the capitalization of the\n\t * next n bits of alphabetic characters\n\t */\n\tlet capBuffer = 1;\n\tfor (let i = 0; i < lastDashIndex + 1; i++) {\n\t\tlet curChar = codedStr.charAt(i);\n\t\tif (curChar !== '-') {\n\t\t\t// safe char\n\t\t\tconst curCharCode = codedStr.charCodeAt(i);\n\t\t\tconst isLowercase = (97 <= curCharCode && curCharCode <= 122); 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