Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/utf/lib/src/utf/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.
+
+part of utf;
+
+/**
+ * Decodes the UTF-32 bytes as an iterable. Thus, the consumer can only convert
+ * as much of the input as needed. Determines the byte order from the BOM,
+ * or uses big-endian as a default. This method always strips a leading BOM.
+ * Set the replacementCharacter to null to throw an ArgumentError
+ * rather than replace the bad value.
+ */
+IterableUtf32Decoder decodeUtf32AsIterable(List<int> bytes, [
+    int offset = 0, int length,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
+  return new IterableUtf32Decoder._(
+      () => new Utf32BytesDecoder(bytes, offset, length, replacementCodepoint));
+}
+
+/**
+ * Decodes the UTF-32BE bytes as an iterable. Thus, the consumer can only convert
+ * as much of the input as needed. This method strips a leading BOM by default,
+ * but can be overridden by setting the optional parameter [stripBom] to false.
+ * Set the replacementCharacter to null to throw an ArgumentError
+ * rather than replace the bad value.
+ */
+IterableUtf32Decoder decodeUtf32beAsIterable(List<int> bytes, [
+    int offset = 0, int length, bool stripBom = true,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
+  return new IterableUtf32Decoder._(
+      () => new Utf32beBytesDecoder(bytes, offset, length, stripBom,
+          replacementCodepoint));
+}
+
+/**
+ * Decodes the UTF-32LE bytes as an iterable. Thus, the consumer can only convert
+ * as much of the input as needed. This method strips a leading BOM by default,
+ * but can be overridden by setting the optional parameter [stripBom] to false.
+ * Set the replacementCharacter to null to throw an ArgumentError
+ * rather than replace the bad value.
+ */
+IterableUtf32Decoder decodeUtf32leAsIterable(List<int> bytes, [
+    int offset = 0, int length, bool stripBom = true,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
+  return new IterableUtf32Decoder._(
+      () => new Utf32leBytesDecoder(bytes, offset, length, stripBom,
+          replacementCodepoint));
+}
+
+/**
+ * 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
+ * ArgumentError rather than replace the bad value.
+ */
+String decodeUtf32(List<int> bytes, [int offset = 0, int length,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
+  return new String.fromCharCodes((new Utf32BytesDecoder(bytes, offset, length,
+      replacementCodepoint)).decodeRest());
+}
+/**
+ * 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
+ * ArgumentError rather than replace the bad value.
+ */
+String decodeUtf32be(
+    List<int> bytes, [int offset = 0, int length, bool stripBom = true,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
+  new String.fromCharCodes((new Utf32beBytesDecoder(bytes, offset, length,
+    stripBom, replacementCodepoint)).decodeRest());
+
+/**
+ * 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
+ * ArgumentError rather than replace the bad value.
+ */
+String decodeUtf32le(
+    List<int> bytes, [int offset = 0, int length, bool stripBom = true,
+    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
+    new String.fromCharCodes((new Utf32leBytesDecoder(bytes, offset, length,
+      stripBom, replacementCodepoint)).decodeRest());
+
+/**
+ * Produce a list of UTF-32 encoded bytes. This method prefixes the resulting
+ * bytes with a big-endian byte-order-marker.
+ */
+List<int> encodeUtf32(String str) =>
+    encodeUtf32be(str, true);
+
+/**
+ * Produce a list of UTF-32BE encoded bytes. By default, this method produces
+ * UTF-32BE bytes with no BOM.
+ */
+List<int> encodeUtf32be(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 list of UTF-32LE encoded bytes. By default, this method produces
+ * UTF-32BE bytes with no BOM.
+ */
+List<int> encodeUtf32le(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;
+}
+
+/**
+ * Identifies whether a List of bytes starts (based on offset) with a
+ * byte-order marker (BOM).
+ */
+bool hasUtf32Bom(
+    List<int> utf32EncodedBytes, [int offset = 0, int length]) {
+  return hasUtf32beBom(utf32EncodedBytes, offset, length) ||
+      hasUtf32leBom(utf32EncodedBytes, offset, length);
+}
+
+/**
+ * Identifies whether a List of bytes starts (based on offset) with a
+ * big-endian byte-order marker (BOM).
+ */
+bool hasUtf32beBom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
+  int end = length != null ? 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;
+}
+
+/**
+ * Identifies whether a List of bytes starts (based on offset) with a
+ * little-endian byte-order marker (BOM).
+ */
+bool hasUtf32leBom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
+  int end = length != null ? 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;
+}
+
+typedef Utf32BytesDecoder Utf32BytesDecoderProvider();
+
+/**
+ * Return type of [decodeUtf32AsIterable] and variants. The Iterable type
+ * provides an iterator on demand and the iterator will only translate bytes
+ * as requested by the user of the iterator. (Note: results are not cached.)
+ */
+// TODO(floitsch): Consider removing the extend and switch to implements since
+// that's cheaper to allocate.
+class IterableUtf32Decoder extends IterableBase<int> {
+  final Utf32BytesDecoderProvider codeunitsProvider;
+
+  IterableUtf32Decoder._(this.codeunitsProvider);
+
+  Utf32BytesDecoder get iterator => codeunitsProvider();
+}
+
+/**
+ * Abstrace parent class converts encoded bytes to codepoints.
+ */
+abstract class Utf32BytesDecoder implements ListRangeIterator {
+  // TODO(kevmoo): should this field be private?
+  final ListRangeIterator utf32EncodedBytesIterator;
+  final int replacementCodepoint;
+  int _current = null;
+
+  Utf32BytesDecoder._fromListRangeIterator(
+      this.utf32EncodedBytesIterator, this.replacementCodepoint);
+
+  factory Utf32BytesDecoder(List<int> utf32EncodedBytes, [
+      int offset = 0, int length,
+      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
+    if (length == null) {
+      length = utf32EncodedBytes.length - offset;
+    }
+    if (hasUtf32beBom(utf32EncodedBytes, offset, length)) {
+      return new Utf32beBytesDecoder(utf32EncodedBytes, offset + 4, length - 4,
+          false, replacementCodepoint);
+    } else if (hasUtf32leBom(utf32EncodedBytes, offset, length)) {
+      return new Utf32leBytesDecoder(utf32EncodedBytes, offset + 4, length - 4,
+          false, replacementCodepoint);
+    } else {
+      return new Utf32beBytesDecoder(utf32EncodedBytes, offset, length, false,
+          replacementCodepoint);
+    }
+  }
+
+  List<int> decodeRest() {
+    List<int> codeunits = new List<int>(remaining);
+    int i = 0;
+    while (moveNext()) {
+      codeunits[i++] = current;
+    }
+    return codeunits;
+  }
+
+  int get current => _current;
+
+  bool moveNext() {
+    _current = null;
+    int remaining = utf32EncodedBytesIterator.remaining;
+    if (remaining == 0) {
+      _current = null;
+      return false;
+    }
+    if (remaining < 4) {
+      utf32EncodedBytesIterator.skip(utf32EncodedBytesIterator.remaining);
+      if (replacementCodepoint != null) {
+          _current = replacementCodepoint;
+          return true;
+      } else {
+        throw new ArgumentError(
+            "Invalid UTF32 at ${utf32EncodedBytesIterator.position}");
+      }
+    }
+    int codepoint = decode();
+    if (_validCodepoint(codepoint)) {
+      _current = codepoint;
+      return true;
+    } else if (replacementCodepoint != null) {
+      _current = replacementCodepoint;
+      return true;
+    } else {
+      throw new ArgumentError(
+          "Invalid UTF32 at ${utf32EncodedBytesIterator.position}");
+    }
+  }
+
+  int get position => utf32EncodedBytesIterator.position ~/ 4;
+
+  void backup([int by = 1]) {
+    utf32EncodedBytesIterator.backup(4 * by);
+  }
+
+  int get remaining => (utf32EncodedBytesIterator.remaining + 3) ~/ 4;
+
+  void skip([int count = 1]) {
+    utf32EncodedBytesIterator.skip(4 * count);
+  }
+
+  int decode();
+}
+
+/**
+ * Convert UTF-32BE encoded bytes to codepoints by grouping 4 bytes
+ * to produce the unicode codepoint.
+ */
+class Utf32beBytesDecoder extends Utf32BytesDecoder {
+  Utf32beBytesDecoder(List<int> utf32EncodedBytes, [int offset = 0,
+      int length, bool stripBom = true,
+      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
+      super._fromListRangeIterator(
+          (new ListRange(utf32EncodedBytes, offset, length)).iterator,
+          replacementCodepoint) {
+    if (stripBom && hasUtf32beBom(utf32EncodedBytes, offset, length)) {
+      skip();
+    }
+  }
+
+  int decode() {
+    utf32EncodedBytesIterator.moveNext();
+    int value = utf32EncodedBytesIterator.current;
+    utf32EncodedBytesIterator.moveNext();
+    value = (value << 8) + utf32EncodedBytesIterator.current;
+    utf32EncodedBytesIterator.moveNext();
+    value = (value << 8) + utf32EncodedBytesIterator.current;
+    utf32EncodedBytesIterator.moveNext();
+    value = (value << 8) + utf32EncodedBytesIterator.current;
+    return value;
+  }
+}
+
+/**
+ * Convert UTF-32BE encoded bytes to codepoints by grouping 4 bytes
+ * to produce the unicode codepoint.
+ */
+class Utf32leBytesDecoder extends Utf32BytesDecoder {
+  Utf32leBytesDecoder(List<int> utf32EncodedBytes, [int offset = 0,
+      int length, bool stripBom = true,
+      int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
+      super._fromListRangeIterator(
+          (new ListRange(utf32EncodedBytes, offset, length)).iterator,
+          replacementCodepoint) {
+    if (stripBom && hasUtf32leBom(utf32EncodedBytes, offset, length)) {
+      skip();
+    }
+  }
+
+  int decode() {
+    utf32EncodedBytesIterator.moveNext();
+    int value = utf32EncodedBytesIterator.current;
+    utf32EncodedBytesIterator.moveNext();
+    value += (utf32EncodedBytesIterator.current << 8);
+    utf32EncodedBytesIterator.moveNext();
+    value += (utf32EncodedBytesIterator.current << 16);
+    utf32EncodedBytesIterator.moveNext();
+    value += (utf32EncodedBytesIterator.current << 24);
+    return value;
+  }
+}
+
+bool _validCodepoint(int codepoint) {
+  return (codepoint >= 0 && codepoint < UNICODE_UTF16_RESERVED_LO) ||
+      (codepoint > UNICODE_UTF16_RESERVED_HI &&
+      codepoint < UNICODE_VALID_RANGE_MAX);
+}