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sm-mobile-20261016T185235Z-8e93ecc1b59a วันที่เพิ่ม: 16 ต.ค. 2026 21:29 · วันที่บิลด์: 16 ต.ค. 2026 20:52

text_codec.dart วันที่เพิ่ม: ไม่ได้บันทึกวันที่ 10.1 KB · 334 บรรทัด

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1import 'dart:convert';

2import 'dart:isolate';

3import 'dart:typed_data';

4import 'charset_tables.dart';

6/// Text encodings the editor can read and write without loss.

7enum TextEncoding {

8 utf8('UTF-8'),

9 utf8Bom('UTF-8 BOM'),

10 utf16le('UTF-16 LE'),

11 utf16be('UTF-16 BE'),

12 windows1250('Windows-1250'),

13 windows1252('Windows-1252'),

14 iso88592('ISO-8859-2'),

15 latin1('ISO-8859-1');

17 final String label;

18 const TextEncoding(this.label);

20 /// The byte order mark written before the text, if any.

21 List<int> get bom => switch (this) {

22 utf8Bom => const [0xef, 0xbb, 0xbf],

23 utf16le => const [0xff, 0xfe],

24 utf16be => const [0xfe, 0xff],

25 _ => const [],

26 };

27}

29enum LineBreak {

30 lf('LF', '\n'),

31 crlf('CRLF', '\r\n'),

32 cr('CR', '\r');

34 final String label, value;

35 const LineBreak(this.label, this.value);

36}

38/// A character the target encoding cannot represent.

39class UnencodableText implements Exception {

40 final TextEncoding encoding;

41 final String sample;

42 final int count;

43 const UnencodableText(this.encoding, this.sample, this.count);

44 @override

45 String toString() => 'UnencodableText(${encoding.label}, $sample ×$count)';

46}

48/// Line breaks used in a text.

49class LineBreakInfo {

50 final int lf, crlf, cr;

51 const LineBreakInfo(this.lf, this.crlf, this.cr);

52 bool get mixed => [lf, crlf, cr].where((n) => n > 0).length > 1;

53 LineBreak get dominant {

54 if (crlf >= lf && crlf >= cr && crlf > 0) return LineBreak.crlf;

55 if (cr > lf && cr > 0) return LineBreak.cr;

56 return LineBreak.lf;

57 }

59 static LineBreakInfo of(String text) {

60 var lf = 0, crlf = 0, cr = 0;

61 for (var i = 0; i < text.length; i++) {

62 final c = text.codeUnitAt(i);

63 if (c == 0x0d) {

64 if (i + 1 < text.length && text.codeUnitAt(i + 1) == 0x0a) {

65 crlf++;

66 i++;

67 } else {

68 cr++;

69 }

70 } else if (c == 0x0a) {

71 lf++;

72 }

73 }

74 return LineBreakInfo(lf, crlf, cr);

75 }

76}

78/// The result of reading a file as text.

79class DecodedText {

80 final String text;

81 final TextEncoding encoding;

82 final LineBreakInfo lineBreaks;

83 final bool finalNewline;

85 /// True when the bytes come back unchanged if the text is saved

86 /// unchanged with [encoding] and the dominant line break.

87 final bool exact;

88 const DecodedText(

89 this.text,

90 this.encoding,

91 this.lineBreaks,

92 this.finalNewline, {

93 required this.exact,

94 });

95}

97/// Whether [bytes] are most likely not text: NUL bytes or many control

98/// characters, unless the data is UTF-16.

99bool looksBinary(Uint8List bytes) {

100 final n = bytes.length < 8192 ? bytes.length : 8192;

101 if (n == 0) return false;

102 if (_utf16Guess(bytes) != null) return false;

103 var control = 0;

104 for (var i = 0; i < n; i++) {

105 final b = bytes[i];

106 if (b == 0) return true;

107 if (b < 0x09 || (b > 0x0d && b < 0x20)) control++;

108 }

109 return control * 10 > n;

110}

111

112bool _startsWith(Uint8List b, List<int> prefix) {

113 if (b.length < prefix.length) return false;

114 for (var i = 0; i < prefix.length; i++) {

115 if (b[i] != prefix[i]) return false;

116 }

117 return true;

118}

119

120/// UTF-16 without a byte order mark, recognised by NUL bytes in every

121/// other position (mostly ASCII text).

122TextEncoding? _utf16Guess(Uint8List b) {

123 final n = (b.length < 4096 ? b.length : 4096) & ~1;

124 if (n < 4) return null;

125 var evenZero = 0, oddZero = 0;

126 for (var i = 0; i < n; i += 2) {

127 if (b[i] == 0) evenZero++;

128 if (b[i + 1] == 0) oddZero++;

129 }

130 final pairs = n ~/ 2;

131 if (oddZero > pairs * 0.4 && evenZero < pairs * 0.05) {

132 return TextEncoding.utf16le;

133 }

134 if (evenZero > pairs * 0.4 && oddZero < pairs * 0.05) {

135 return TextEncoding.utf16be;

136 }

137 return null;

138}

139

140/// Detects the encoding: a byte order mark, then valid UTF-8, then UTF-16

141/// without BOM. Returns null when the encoding cannot be known (legacy

142/// 8-bit text); the user then chooses, nothing is converted silently.

143TextEncoding? detectEncoding(Uint8List bytes) {

144 if (_startsWith(bytes, TextEncoding.utf8Bom.bom)) return TextEncoding.utf8Bom;

145 if (_startsWith(bytes, TextEncoding.utf16le.bom)) return TextEncoding.utf16le;

146 if (_startsWith(bytes, TextEncoding.utf16be.bom)) return TextEncoding.utf16be;

147 final utf16 = _utf16Guess(bytes);

148 if (utf16 != null) return utf16;

149 try {

150 utf8.decode(bytes);

151 return TextEncoding.utf8;

152 } on FormatException {

153 return null;

154 }

155}

156

157String _decodeSingleByte(Uint8List b, List<int>? high) {

158 final units = Uint16List(b.length);

159 for (var i = 0; i < b.length; i++) {

160 final v = b[i];

161 if (v < 0x80 || high == null) {

162 units[i] = v;

163 } else {

164 final c = high[v - 0x80];

165 if (c < 0) {

166 throw FormatException('Byte 0x${v.toRadixString(16)} undefined', b, i);

167 }

168 units[i] = c;

169 }

170 }

171 return String.fromCharCodes(units);

172}

173

174List<int>? _table(TextEncoding e) => switch (e) {

175 TextEncoding.windows1250 => windows1250High,

176 TextEncoding.windows1252 => windows1252High,

177 TextEncoding.iso88592 => iso88592High,

178 _ => null,

179};

180

181/// Decodes [bytes] as [encoding]. Throws [FormatException] for bytes that

182/// are not valid in that encoding.

183String decodeText(Uint8List bytes, TextEncoding encoding) {

184 final bom = encoding.bom;

185 final body = _startsWith(bytes, bom)

186 ? Uint8List.sublistView(bytes, bom.length)

187 : bytes;

188 switch (encoding) {

189 case TextEncoding.utf8:

190 case TextEncoding.utf8Bom:

191 return utf8.decode(body);

192 case TextEncoding.utf16le:

193 case TextEncoding.utf16be:

194 if (body.length.isOdd) {

195 throw const FormatException('UTF-16 data has an odd length');

196 }

197 final le = encoding == TextEncoding.utf16le;

198 final units = Uint16List(body.length ~/ 2);

199 for (var i = 0; i < units.length; i++) {

200 final a = body[2 * i], b = body[2 * i + 1];

201 units[i] = le ? a | (b << 8) : (a << 8) | b;

202 }

203 // Unpaired surrogates would not survive a round trip.

204 for (var i = 0; i < units.length; i++) {

205 final u = units[i];

206 if (u >= 0xd800 && u <= 0xdbff) {

207 if (i + 1 >= units.length ||

208 units[i + 1] < 0xdc00 ||

209 units[i + 1] > 0xdfff) {

210 throw FormatException('Unpaired surrogate', body, 2 * i);

211 }

212 i++;

213 } else if (u >= 0xdc00 && u <= 0xdfff) {

214 throw FormatException('Unpaired surrogate', body, 2 * i);

215 }

216 }

217 return String.fromCharCodes(units);

218 case TextEncoding.latin1:

219 return _decodeSingleByte(body, null);

220 case TextEncoding.windows1250:

221 case TextEncoding.windows1252:

222 case TextEncoding.iso88592:

223 return _decodeSingleByte(body, _table(encoding));

224 }

225}

226

227/// Encodes [text] as [encoding], including its byte order mark. Throws

228/// [UnencodableText] when a character cannot be represented, instead of

229/// replacing it.

230Uint8List encodeText(String text, TextEncoding encoding) {

231 final out = BytesBuilder(copy: false)..add(encoding.bom);

232 switch (encoding) {

233 case TextEncoding.utf8:

234 case TextEncoding.utf8Bom:

235 out.add(utf8.encode(text));

236 case TextEncoding.utf16le:

237 case TextEncoding.utf16be:

238 final le = encoding == TextEncoding.utf16le;

239 final b = Uint8List(text.length * 2);

240 for (var i = 0; i < text.length; i++) {

241 final u = text.codeUnitAt(i);

242 b[2 * i] = le ? u & 0xff : u >> 8;

243 b[2 * i + 1] = le ? u >> 8 : u & 0xff;

244 }

245 out.add(b);

246 case TextEncoding.latin1:

247 case TextEncoding.windows1250:

248 case TextEncoding.windows1252:

249 case TextEncoding.iso88592:

250 final table = _table(encoding);

251 final reverse = <int, int>{

252 if (table != null)

253 for (var i = 0; i < 128; i++)

254 if (table[i] >= 0) table[i]: 0x80 + i,

255 };

256 final b = Uint8List(text.length);

257 String? sample;

258 var bad = 0;

259 for (var i = 0; i < text.length; i++) {

260 final u = text.codeUnitAt(i);

261 int? v;

262 if (u < 0x80) {

263 v = u;

264 } else if (table == null) {

265 v = u <= 0xff ? u : null;

266 } else {

267 v = reverse[u];

268 }

269 if (v == null) {

270 bad++;

271 sample ??= String.fromCharCode(u);

272 v = 0x3f;

273 }

274 b[i] = v;

275 }

276 if (bad > 0) throw UnencodableText(encoding, sample!, bad);

277 out.add(b);

278 }

279 return out.takeBytes();

280}

281

282bool _sameBytes(Uint8List a, Uint8List b) {

283 if (a.length != b.length) return false;

284 for (var i = 0; i < a.length; i++) {

285 if (a[i] != b[i]) return false;

286 }

287 return true;

288}

289

290/// Decodes [bytes] for editing and records everything needed to write them

291/// back unchanged. Throws [FormatException] when [encoding] (or the

292/// detected one) does not fit, and [UnknownEncoding] when no encoding

293/// could be detected.

294DecodedText decodeDocument(Uint8List bytes, {TextEncoding? encoding}) {

295 final enc = encoding ?? detectEncoding(bytes);

296 if (enc == null) throw const UnknownEncoding();

297 final text = decodeText(bytes, enc);

298 final breaks = LineBreakInfo.of(text);

299 final finalNewline = text.endsWith('\n') || text.endsWith('\r');

300 bool exact;

301 try {

302 exact = !breaks.mixed && _sameBytes(encodeText(text, enc), bytes);

303 } on UnencodableText {

304 exact = false;

305 }

306 return DecodedText(text, enc, breaks, finalNewline, exact: exact);

307}

308

309class UnknownEncoding implements Exception {

310 const UnknownEncoding();

311}

312

313/// Joins editor lines (already split on any line break) with [lineBreak].

314String withLineBreaks(String text, LineBreak lineBreak) {

315 final normalized = text.replaceAll('\r\n', '\n').replaceAll('\r', '\n');

316 return lineBreak == LineBreak.lf

317 ? normalized

318 : normalized.replaceAll('\n', lineBreak.value);

319}

320

321/// [decodeDocument] on a background isolate for large files. Top-level so

322/// that the closure sent to the isolate captures only its arguments.

323Future<DecodedText> decodeInBackground(

324 Uint8List bytes, {

325 TextEncoding? encoding,

326}) => bytes.length > 256 * 1024

327 ? Isolate.run(() => decodeDocument(bytes, encoding: encoding))

328 : Future.value(decodeDocument(bytes, encoding: encoding));

329

330/// [encodeText] on a background isolate for large texts.

331Future<Uint8List> encodeInBackground(String text, TextEncoding encoding) =>

332 text.length > 256 * 1024

333 ? Isolate.run(() => encodeText(text, encoding))

334 : Future.value(encodeText(text, encoding));

335

SHA-256

0ad2c36cdc055a4dc3f5f3b416914869e48835e95b7f570e55adbf1188fc33da

CH-J Proprietary Software License 1.14 · ซอร์สโค้ดนี้ให้ไว้ภายใต้ CH-J Proprietary Software License 1.14 การเปิดให้เข้าถึงไม่ได้เปลี่ยนแปลงเงื่อนไขของสัญญาอนุญาตหรือให้สิทธิ์เพิ่มเติม

SHA-256 ของไฟล์บีบอัด

46e427a43e87af091004f36145590bda8fe90086dfb0f631afeb5029fb0b5655