Fix typos

Fixes dart-lang#47505

Change-Id: Ic2e25800263e96b2b4282f89ec0be017c86d4adb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/217361
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Commit-Queue: Lasse R.H. Nielsen <lrn@google.com>

pkg/analysis_server/lib/src/plugin/result_merger.dart

@@ -361,10 +361,10 @@ class ResultMerger {
     }
     var elementMap = <Element, Set<int>>{};
     for (var partialResults in partialResultList) {
-      for (var occurances in partialResults) {
-        var element = occurances.element;
+      for (var occurrences in partialResults) {
+        var element = occurrences.element;
         var offsets = elementMap.putIfAbsent(element, () => HashSet<int>());
-        offsets.addAll(occurances.offsets);
+        offsets.addAll(occurrences.offsets);
       }
     }
     var mergedOccurrences = <Occurrences>[];

sdk/lib/_http/http.dart

@@ -2064,7 +2064,7 @@ abstract class HttpClientRequest implements IOSink {
   /// the request has been aborted
   ///
   /// ```dart import:async
-  /// HttpClientRequst request = ...
+  /// HttpClientRequest request = ...
   /// request.write();
   /// Timer(Duration(seconds: 1), () {
   ///   request.abort();

sdk/lib/_http/http_parser.dart

@@ -106,7 +106,7 @@ class _MessageType {
  *
  * It does so by overriding pause/resume, so that once the
  * _HttpDetachedStreamSubscription is resumed, it'll deliver the data before
- * resuming the underlaying subscription.
+ * resuming the underlying subscription.
  */
 class _HttpDetachedStreamSubscription implements StreamSubscription<Uint8List> {
   StreamSubscription<Uint8List> _subscription;
@@ -692,7 +692,7 @@ class _HttpParser extends Stream<_HttpIncoming> {
             const errorIfBothText = "Both Content-Length and Transfer-Encoding "
                 "are specified, at most one is allowed";
             if (headerField == HttpHeaders.contentLengthHeader) {
-              // Content Length header should not have more than one occurance
+              // Content Length header should not have more than one occurrence
               // or coexist with Transfer Encoding header.
               if (_contentLength) {
                 throw HttpException("The Content-Length header occurred "
@@ -777,7 +777,7 @@ class _HttpParser extends Stream<_HttpIncoming> {
             _state = _State.CHUNK_SIZE_EXTENSION;
           } else {
             int value = _expectHexDigit(byte);
-            // Checks whether (_remaingingContent * 16 + value) overflows.
+            // Checks whether (_remainingContent * 16 + value) overflows.
             if (_remainingContent > _chunkSizeLimit >> 4) {
               throw HttpException('Chunk size overflows the integer');
             }

sdk/lib/async/future.dart

@@ -60,7 +60,7 @@ abstract class FutureOr<T> {
 /// To perform an asynchronous computation, you use an `async` function
 /// which always produces a future.
 /// Inside such an asynchronous function, you can use the `await` operation
-/// to delay execution until another asyncronous computation has a result.
+/// to delay execution until another asynchronous computation has a result.
 /// While execution of the awaiting function is delayed,
 /// the program is not blocked, and can continue doing other things.
 ///

sdk/lib/async/future_impl.dart

@@ -243,7 +243,7 @@ class _Future<T> implements Future<T> {
 
   /// The future has been completed with an error result.
   ///
-  /// [_resultOrListeners] contains an [AsyncEror]
+  /// [_resultOrListeners] contains an [AsyncError]
   /// holding the error and stack trace.
   static const int _stateError = 16;
 

sdk/lib/core/date_time.dart

@@ -264,7 +264,7 @@ class DateTime implements Comparable<DateTime> {
   /// them as overflows into the next larger component.
   /// For example, "2020-01-42" will be parsed as 2020-02-11, because
   /// the last valid date in that month is 2020-01-31, so 42 days is
-  /// interprted as 31 days of that month plus 11 days into the next month.
+  /// interpreted as 31 days of that month plus 11 days into the next month.
   ///
   /// To detect and reject invalid component values, use
   /// [DateFormat.parseStrict](https://pub.dev/documentation/intl/latest/intl/DateFormat/parseStrict.html)

sdk/lib/core/num.dart

@@ -222,7 +222,7 @@ abstract class num implements Comparable<num> {
   /// a finite double or an infinite double ([double.infinity]
   /// or [double.negativeInfinity]).
   ///
-  /// All numbers satisfy exacly one of [isInfinite], [isFinite]
+  /// All numbers satisfy exactly one of [isInfinite], [isFinite]
   /// and `isNaN`.
   bool get isNaN;
 
@@ -237,7 +237,7 @@ abstract class num implements Comparable<num> {
   ///
   /// Only satisfied by [double.infinity] and [double.negativeInfinity].
   ///
-  /// All numbers satisfy exacly one of `isInfinite`, [isFinite]
+  /// All numbers satisfy exactly one of `isInfinite`, [isFinite]
   /// and [isNaN].
   bool get isInfinite;
 
@@ -246,7 +246,7 @@ abstract class num implements Comparable<num> {
   /// The only non-finite numbers are NaN values, positive infinity, and
   /// negative infinity. All integers are finite.
   ///
-  /// All numbers satisfy exacly one of [isInfinite], `isFinite`
+  /// All numbers satisfy exactly one of [isInfinite], `isFinite`
   /// and [isNaN].
   bool get isFinite;
 
@@ -304,7 +304,7 @@ abstract class num implements Comparable<num> {
 
   /// The least integer no smaller than `this`.
   ///
-  /// Rounds fractional values towards positive infinitiy.
+  /// Rounds fractional values towards positive infinity.
   ///
   /// The number must be finite (see [isFinite]).
   ///

sdk/lib/core/object.dart

@@ -90,7 +90,7 @@ class Object {
   /// Some classes have a default textual representation,
   /// often paired with a static `parse` function (like [int.parse]).
   /// These classes will provide the textual representation as
-  /// their string represetion.
+  /// their string representation.
   ///
   /// Other classes have no meaningful textual representation
   /// that a program will care about.
@@ -501,7 +501,7 @@ class Object {
   /// again with objects that have the same hash codes in the same order
   /// during an execution of a single program.
   ///
-  /// The hash value generated by this function is *not* guranteed to be stable
+  /// The hash value generated by this function is *not* guaranteed to be stable
   /// over different runs of the same program,
   /// or between code run in different isolates of the same program.
   /// The exact algorithm used may differ between different platforms,
@@ -540,7 +540,7 @@ class Object {
   /// during an execution of a single program,
   /// even if the objects are not necessarily in the same order,
   ///
-  /// The hash value generated by this function is *not* guranteed to be stable
+  /// The hash value generated by this function is *not* guaranteed to be stable
   /// over different runs of the same program.
   /// The exact algorithm used may differ between different platforms,
   /// or between different versions of the platform libraries,

sdk/lib/core/uri.dart

@@ -3134,7 +3134,7 @@ class UriData {
   /// That is always either -1 or 4, depending on whether `_text` includes the
   /// `data:` scheme or not.
   ///
-  /// The first speparator ends the mime type. We don't bother with finding
+  /// The first separator ends the mime type. We don't bother with finding
   /// the '/' inside the mime type.
   ///
   /// Each two separators after that marks a parameter key and value.

sdk/lib/html/dart2js/html_dart2js.dart

@@ -18328,7 +18328,7 @@ class HttpRequest extends HttpRequestEventTarget {
   /**
    * Specify the desired `url`, and `method` to use in making the request.
    *
-   * By default the request is done asyncronously, with no user or password
+   * By default the request is done asynchronously, with no user or password
    * authentication information. If `async` is false, the request will be sent
    * synchronously.
    *

tools/dom/docs/docs.json

@@ -4207,7 +4207,7 @@
           "/**",
           "   * Specify the desired `url`, and `method` to use in making the request.",
           "   *",
-          "   * By default the request is done asyncronously, with no user or password",
+          "   * By default the request is done asynchronously, with no user or password",
           "   * authentication information. If `async` is false, the request will be send",
           "   * synchronously.",
           "   *",

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

@@ -359,7 +359,7 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
   /**
    * Specify the desired `url`, and `method` to use in making the request.
    *
-   * By default the request is done asyncronously, with no user or password
+   * By default the request is done asynchronously, with no user or password
    * authentication information. If `async` is false, the request will be sent
    * synchronously.
    *