Remove deprecated dart:utf library.

sdk/lib/utf/utf16.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of dart.utf;
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-IterableUtf16Decoder decodeUtf16AsIterable(List<int> bytes, [int offset = 0,
-    int length, int replacementCodepoint =
-    UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  return new IterableUtf16Decoder._(
-      () => new Utf16BytesToCodeUnitsDecoder(bytes, offset, length,
-      replacementCodepoint), replacementCodepoint);
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-IterableUtf16Decoder decodeUtf16beAsIterable(List<int> bytes, [int offset = 0,
-    int length, bool stripBom = true, int replacementCodepoint =
-    UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  return new IterableUtf16Decoder._(
-      () => new Utf16beBytesToCodeUnitsDecoder(bytes, offset, length, stripBom,
-      replacementCodepoint), replacementCodepoint);
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-IterableUtf16Decoder decodeUtf16leAsIterable(List<int> bytes, [int offset = 0,
-    int length, bool stripBom = true, int replacementCodepoint =
-    UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  return new IterableUtf16Decoder._(
-      () => new Utf16leBytesToCodeUnitsDecoder(bytes, offset, length, stripBom,
-      replacementCodepoint), replacementCodepoint);
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-String decodeUtf16(List<int> bytes, [int offset = 0, int length,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  Utf16BytesToCodeUnitsDecoder decoder = new Utf16BytesToCodeUnitsDecoder(bytes,
-      offset, length, replacementCodepoint);
-  List<int> codeunits = decoder.decodeRest();
-  return new String.fromCharCodes(
-      _utf16CodeUnitsToCodepoints(codeunits, 0, null, replacementCodepoint));
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-String decodeUtf16be(List<int> bytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  List<int> codeunits = (new Utf16beBytesToCodeUnitsDecoder(bytes, offset,
-      length, stripBom, replacementCodepoint)).decodeRest();
-  return new String.fromCharCodes(
-      _utf16CodeUnitsToCodepoints(codeunits, 0, null, replacementCodepoint));
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-String decodeUtf16le(List<int> bytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  List<int> codeunits = (new Utf16leBytesToCodeUnitsDecoder(bytes, offset,
-      length, stripBom, replacementCodepoint)).decodeRest();
-  return new String.fromCharCodes(
-      _utf16CodeUnitsToCodepoints(codeunits, 0, null, replacementCodepoint));
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-List<int> encodeUtf16(String str) =>
-    encodeUtf16be(str, true);
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-List<int> encodeUtf16be(String str, [bool writeBOM = false]) {
-  List<int> utf16CodeUnits = _stringToUtf16CodeUnits(str);
-  List<int> encoding =
-      new List<int>(2 * utf16CodeUnits.length + (writeBOM ? 2 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-  }
-  for (int unit in utf16CodeUnits) {
-    encoding[i++] = (unit & UNICODE_BYTE_ONE_MASK) >> 8;
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-  }
-  return encoding;
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-List<int> encodeUtf16le(String str, [bool writeBOM = false]) {
-  List<int> utf16CodeUnits = _stringToUtf16CodeUnits(str);
-  List<int> encoding =
-      new List<int>(2 * utf16CodeUnits.length + (writeBOM ? 2 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-  }
-  for (int unit in utf16CodeUnits) {
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit & UNICODE_BYTE_ONE_MASK) >> 8;
-  }
-  return encoding;
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-bool hasUtf16Bom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
-  return hasUtf16beBom(utf32EncodedBytes, offset, length) ||
-      hasUtf16leBom(utf32EncodedBytes, offset, length);
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-bool hasUtf16beBom(List<int> utf16EncodedBytes, [int offset = 0, int length]) {
-  int end = length != null ? offset + length : utf16EncodedBytes.length;
-  return (offset + 2) <= end &&
-      utf16EncodedBytes[offset] == UNICODE_UTF_BOM_HI &&
-      utf16EncodedBytes[offset + 1] == UNICODE_UTF_BOM_LO;
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-bool hasUtf16leBom(List<int> utf16EncodedBytes, [int offset = 0, int length]) {
-  int end = length != null ? offset + length : utf16EncodedBytes.length;
-  return (offset + 2) <= end &&
-      utf16EncodedBytes[offset] == UNICODE_UTF_BOM_LO &&
-      utf16EncodedBytes[offset + 1] == UNICODE_UTF_BOM_HI;
-}
-
-List<int> _stringToUtf16CodeUnits(String str) {
-  return _codepointsToUtf16CodeUnits(str.codeUnits);
-}
-
-typedef _ListRangeIterator _CodeUnitsProvider();
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-class IterableUtf16Decoder extends IterableBase<int> {
-  final _CodeUnitsProvider codeunitsProvider;
-  final int replacementCodepoint;
-
-  IterableUtf16Decoder._(this.codeunitsProvider, this.replacementCodepoint);
-
-  Utf16CodeUnitDecoder get iterator =>
-      new Utf16CodeUnitDecoder.fromListRangeIterator(codeunitsProvider(),
-          replacementCodepoint);
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-abstract class Utf16BytesToCodeUnitsDecoder implements _ListRangeIterator {
-  final _ListRangeIterator utf16EncodedBytesIterator;
-  final int replacementCodepoint;
-  int _current = null;
-
-  Utf16BytesToCodeUnitsDecoder._fromListRangeIterator(
-      this.utf16EncodedBytesIterator, this.replacementCodepoint);
-
-  factory Utf16BytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [
-      int offset = 0, int length,
-      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-    if (length == null) {
-      length = utf16EncodedBytes.length - offset;
-    }
-    if (hasUtf16beBom(utf16EncodedBytes, offset, length)) {
-      return new Utf16beBytesToCodeUnitsDecoder(utf16EncodedBytes, offset + 2,
-          length - 2, false, replacementCodepoint);
-    } else if (hasUtf16leBom(utf16EncodedBytes, offset, length)) {
-      return new Utf16leBytesToCodeUnitsDecoder(utf16EncodedBytes, offset + 2,
-          length - 2, false, replacementCodepoint);
-    } else {
-      return new Utf16beBytesToCodeUnitsDecoder(utf16EncodedBytes, offset,
-          length, false, replacementCodepoint);
-    }
-  }
-
-  /**
-   * Provides a fast way to decode the rest of the source bytes in a single
-   * call. This method trades memory for improved speed in that it potentially
-   * over-allocates the List containing results.
-   */
-  List<int> decodeRest() {
-    List<int> codeunits = new List<int>(remaining);
-    int i = 0;
-    while (moveNext()) {
-      codeunits[i++] = current;
-    }
-    if (i == codeunits.length) {
-      return codeunits;
-    } else {
-      List<int> truncCodeunits = new List<int>(i);
-      truncCodeunits.setRange(0, i, codeunits);
-      return truncCodeunits;
-    }
-  }
-
-  int get current => _current;
-
-  bool moveNext() {
-    _current = null;
-    if (utf16EncodedBytesIterator.remaining < 2) {
-      utf16EncodedBytesIterator.moveNext();
-      if (replacementCodepoint != null) {
-        _current = replacementCodepoint;
-        return true;
-      } else {
-        throw new ArgumentError(
-            "Invalid UTF16 at ${utf16EncodedBytesIterator.position}");
-      }
-    } else {
-      _current = decode();
-      return true;
-    }
-  }
-
-  int get position => utf16EncodedBytesIterator.position ~/ 2;
-
-  void backup([int by = 1]) {
-    utf16EncodedBytesIterator.backup(2 * by);
-  }
-
-  int get remaining => (utf16EncodedBytesIterator.remaining + 1) ~/ 2;
-
-  void skip([int count = 1]) {
-    utf16EncodedBytesIterator.skip(2 * count);
-  }
-
-  int decode();
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-class Utf16beBytesToCodeUnitsDecoder extends Utf16BytesToCodeUnitsDecoder {
-  Utf16beBytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [
-      int offset = 0, int length, bool stripBom = true,
-      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
-      super._fromListRangeIterator(
-          (new _ListRange(utf16EncodedBytes, offset, length)).iterator,
-          replacementCodepoint) {
-    if (stripBom && hasUtf16beBom(utf16EncodedBytes, offset, length)) {
-      skip();
-    }
-  }
-
-  int decode() {
-    utf16EncodedBytesIterator.moveNext();
-    int hi = utf16EncodedBytesIterator.current;
-    utf16EncodedBytesIterator.moveNext();
-    int lo = utf16EncodedBytesIterator.current;
-    return (hi << 8) + lo;
-  }
-}
-
-/**
- * *DEPRECATED*: Use `package:utf/utf.dart` or, when applicable, `dart:convert`
- * instead.
- */
-@deprecated
-class Utf16leBytesToCodeUnitsDecoder extends Utf16BytesToCodeUnitsDecoder {
-  Utf16leBytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [
-      int offset = 0, int length, bool stripBom = true,
-      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
-      super._fromListRangeIterator(
-          (new _ListRange(utf16EncodedBytes, offset, length)).iterator,
-          replacementCodepoint) {
-    if (stripBom && hasUtf16leBom(utf16EncodedBytes, offset, length)) {
-      skip();
-    }
-  }
-
-  int decode() {
-    utf16EncodedBytesIterator.moveNext();
-    int lo = utf16EncodedBytesIterator.current;
-    utf16EncodedBytesIterator.moveNext();
-    int hi = utf16EncodedBytesIterator.current;
-    return (hi << 8) + lo;
-  }
-}