Include addBool/BoolReader into FlatBuffers.

pkg/analyzer/lib/src/summary/flat_buffers.dart

Index: pkg/analyzer/lib/src/summary/flat_buffers.dart
diff --git a/pkg/analyzer/lib/src/summary/flat_buffers.dart b/pkg/analyzer/lib/src/summary/flat_buffers.dart
index 5c1df2e66413c5589a11d1a2b0457e2ffd4707e0..708fa022517b0254fac68ceb60484da9ba3aa274 100644
--- a/pkg/analyzer/lib/src/summary/flat_buffers.dart
+++ b/pkg/analyzer/lib/src/summary/flat_buffers.dart
@@ -10,6 +10,19 @@ import 'dart:math';
 import 'dart:typed_data';
 
 /**
+ * The reader of booleans.
+ */
+class BoolReader extends Reader<bool> {
+  const BoolReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  bool read(BufferPointer bp) => bp._getInt8() == 1;

[Paul Berry, 2016/01/09 14:38:46]

Nit: I'd prefer to do `bp._getInt8() != 0`, for consistency with the way bools
are handled in languages like C.  Of course it will never actually make a
difference assuming the summary isn't corrupted :)

[scheglov, 2016/01/09 18:26:14]

Done.

+}
+
+/**
  * A pointer to some data.
  */
 class BufferPointer {
@@ -102,6 +115,23 @@ class Builder {
   }
 
   /**
+   * Add the [field] with the given boolean [value].  The field is not added if
+   * the [value] is equal to [def].  Booleans are stored as 8-bit fields with
+   * `0` for `false` and `1` for `true`.
+   */
+  void addBool(int field, bool value, [bool def]) {
+    if (_currentVTable == null) {
+      throw new StateError('Start a table before adding values.');
+    }
+    if (value != null && value != def) {
+      int size = 1;
+      _prepare(size, 1);
+      _trackField(field);
+      _buf.setInt8(_buf.lengthInBytes - _tail, value ? 1 : 0);
+    }
+  }
+
+  /**
    * Add the [field] with the given 32-bit signed integer [value].  The field is
    * not added if the [value] is equal to [def].
    */
@@ -109,7 +139,7 @@ class Builder {
     if (_currentVTable == null) {
       throw new StateError('Start a table before adding values.');
     }
-    if (value != def) {
+    if (value != null && value != def) {
       int size = 4;
       _prepare(size, 1);
       _trackField(field);
@@ -125,7 +155,7 @@ class Builder {
     if (_currentVTable == null) {
       throw new StateError('Start a table before adding values.');
     }
-    if (value != def) {
+    if (value != null && value != def) {
       int size = 8;
       _prepare(size, 1);
       _trackField(field);
@@ -141,7 +171,7 @@ class Builder {
     if (_currentVTable == null) {
       throw new StateError('Start a table before adding values.');
     }
-    if (value != def) {
+    if (value != null && value != def) {
       int size = 1;
       _prepare(size, 1);
       _trackField(field);