Fix mac/git renaming case failure. Aaarrrrgggghhhh.

utils/string_encoding/Utf32.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.
-
-#library("utf32");
-#import("unicode_core.dart");
-#import("unicode.dart");
-
-/**
- * Produce a String from a sequence of UTF-32 encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf32(List<int> bytes, [int offset = 0, int length,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
-    codepointsToString(_utf32ToCodePoints(bytes, offset, length,
-        replacementCodepoint));
-
-/**
- * Produce a String from a sequence of UTF-32BE encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf32be(
-    List<int> bytes, [int offset = 0, int length, bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
-    codepointsToString(_utf32beToCodePoints(bytes, offset, length, stripBom,
-        replacementCodepoint));
-
-/**
- * Produce a String from a sequence of UTF-32LE encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf32le(
-    List<int> bytes, [int offset = 0, int length, bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
-    codepointsToString(_utf32leToCodePoints(bytes, offset, length, stripBom,
-        replacementCodepoint));
-
-/**
- * Produce a sequence of UTF-32 encoded bytes.
- */
-List<int> encodeAsUtf32(String str) =>
-    encodeAsUtf32be(str, true);
-
-/**
- * Produce a sequence of UTF-32BE encoded bytes.
- */
-List<int> encodeAsUtf32be(String str, [bool writeBOM = false]) {
-  List<int> utf32CodeUnits = stringToCodepoints(str);
-  List<int> encoding = new List<int>(4 * utf32CodeUnits.length +
-      (writeBOM ? 4 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = 0;
-    encoding[i++] = 0;
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-  }
-  for (int unit in utf32CodeUnits) {
-    encoding[i++] = (unit >> 24) & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit >> 16) & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit >> 8) & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-  }
-  return encoding;
-}
-
-/**
- * Produce a sequence of UTF-32LE encoded bytes.
- */
-List<int> encodeAsUtf32le(String str, [bool writeBOM = false]) {
-  List<int> utf32CodeUnits = stringToCodepoints(str);
-  List<int> encoding = new List<int>(4 * utf32CodeUnits.length +
-      (writeBOM ? 4 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-    encoding[i++] = 0;
-    encoding[i++] = 0;
-  }
-  for (int unit in utf32CodeUnits) {
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit >> 8) & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit >> 16) & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit >> 24) & UNICODE_BYTE_ZERO_MASK;
-  }
-  return encoding;
-}
-
-bool hasUtf32Bom(
-    List<int> utf32EncodedBytes, [int offset = 0, int length]) {
-  return hasUtf32beBom(utf32EncodedBytes, offset, length) ||
-      hasUtf32leBom(utf32EncodedBytes, offset, length);
-}
-
-bool hasUtf32beBom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf32EncodedBytes.length, offset + length) :
-      utf32EncodedBytes.length;
-
-  return (offset + 4) <= end &&
-      utf32EncodedBytes[offset] == 0 &&
-      utf32EncodedBytes[offset + 1] == 0 &&
-      utf32EncodedBytes[offset + 2] == UNICODE_UTF_BOM_HI &&
-      utf32EncodedBytes[offset + 3] == UNICODE_UTF_BOM_LO;
-}
-
-bool hasUtf32leBom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf32EncodedBytes.length, offset + length) :
-      utf32EncodedBytes.length;
-
-  return (offset + 4) <= end &&
-      utf32EncodedBytes[offset] == UNICODE_UTF_BOM_LO &&
-      utf32EncodedBytes[offset + 1] == UNICODE_UTF_BOM_HI &&
-      utf32EncodedBytes[offset + 2] == 0 &&
-      utf32EncodedBytes[offset + 3] == 0;
-}
-
-void _addReplacementCodepoint(List<int> codepointBuffer, int offset,
-    int replacementCodepoint) {
-  if(replacementCodepoint != null) {
-    codepointBuffer[offset] = replacementCodepoint;
-  } else {
-    throw new IllegalArgumentException("Invalid encoding");
-  }
-}
-
-int _sizeCodepoints(int utf32BytesLength) =>
-    ((utf32BytesLength)/4).ceil().toInt();
-
-/**
- * Joins groups of 4 bytes (0-255) UTF-32BE to produce single code points.
- */
-List<int> _utf32beToCodePoints(
-    List<int> utf32beEncodedBytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf32beEncodedBytes.length, offset + length) :
-      utf32beEncodedBytes.length;
-
-  int i = (stripBom && hasUtf32beBom(utf32beEncodedBytes, offset, length)) ?
-      offset + 4 : offset;
-  int lastIndex = end - 3;
-  List<int> codepoints = new List<int>(_sizeCodepoints(end - i));
-  int j = 0;
-  while (i < lastIndex) {
-    int value = utf32beEncodedBytes[i++];
-    value = (value << 8) + utf32beEncodedBytes[i++];
-    value = (value << 8) + utf32beEncodedBytes[i++];
-    value = (value << 8) + utf32beEncodedBytes[i++];
-    if (_validCodepoint(value)) {
-      codepoints[j++] = value;
-    } else {
-      _addReplacementCodepoint(codepoints, j++, replacementCodepoint);
-    }
-  }
-  while (j < codepoints.length) {
-    _addReplacementCodepoint(codepoints, j++, replacementCodepoint);
-  }
-  return codepoints;
-}
-
-/**
- * Joins groups of 4 bytes (0-255) UTF-32LE to produce single code points.
- */
-List<int> _utf32leToCodePoints(
-    List<int> utf32leEncodedBytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf32leEncodedBytes.length, offset + length) :
-      utf32leEncodedBytes.length;
-
-  int i = (stripBom && hasUtf32leBom(utf32leEncodedBytes, offset, length)) ?
-      offset + 4 : offset;
-  int lastIndex = end - 3;
-  List<int> codepoints = new List<int>(_sizeCodepoints(end - i));
-  int j = 0;
-  while (i < lastIndex) {
-    int value = utf32leEncodedBytes[i+3];
-    value = (value << 8) + utf32leEncodedBytes[i+2];
-    value = (value << 8) + utf32leEncodedBytes[i+1];
-    value = (value << 8) + utf32leEncodedBytes[i];
-    i += 4;
-    if (_validCodepoint(value)) {
-      codepoints[j++] = value;
-    } else {
-      _addReplacementCodepoint(codepoints, j++, replacementCodepoint);
-    }
-  }
-  while (j < codepoints.length) {
-    _addReplacementCodepoint(codepoints, j++, replacementCodepoint);
-  }
-  return codepoints;
-}
-
-/**
- * Joins groups of 4 bytes (0-255) UTF-32 to produce single code points.
- */
-List<int> _utf32ToCodePoints(List<int> utf32EncodedBytes, [int offset = 0,
-    int length,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf32EncodedBytes.length, offset + length) :
-      utf32EncodedBytes.length;
-
-  if (hasUtf32beBom(utf32EncodedBytes, offset, length)) {
-    return _utf32beToCodePoints(utf32EncodedBytes, offset + 4,
-        end - (offset + 4), false);
-  } else if (hasUtf32leBom(utf32EncodedBytes, offset, length)) {
-    return _utf32leToCodePoints(utf32EncodedBytes, offset + 4,
-        end - (offset + 4), false);
-  } else {
-    return _utf32beToCodePoints(utf32EncodedBytes, offset, end - offset);
-  }
-}
-
-bool _validCodepoint(int codepoint) {
-  return (codepoint >= 0 && codepoint < UNICODE_UTF16_RESERVED_LO) ||
-      (codepoint > UNICODE_UTF16_RESERVED_HI &&
-      codepoint < UNICODE_VALID_RANGE_MAX);
-}