Deprecate value in favor of constant; valueorvariable -> input value

graphql_parser/lib/src/language/ast/constant.dart

@@ -0,0 +1,11 @@
+import 'node.dart';
+
+abstract class ConstantContext<T> extends Node {
+  T get value;
+}
+
+/// Use [ConstantContext] instead. This class remains solely for backwards compatibility.
+@deprecated
+abstract class ValueContext<T> extends ConstantContext<T> {
+  T get value;
+}

graphql_parser/lib/src/language/ast/input_value.dart

@@ -0,0 +1,16 @@
+import 'package:source_span/source_span.dart';
+import 'constant.dart';
+import 'node.dart';
+import 'variable.dart';
+
+class InputValueContext extends Node {
+  final ConstantContext constant;
+  final VariableContext variable;
+
+  InputValueContext(this.constant, this.variable) {
+    assert(constant != null || variable != null);
+  }
+
+  @override
+  FileSpan get span => constant?.span ?? variable.span;
+}

graphql_parser/lib/src/language/ast/value.dart

@@ -1,5 +0,0 @@
-import 'node.dart';
-
-abstract class ValueContext<T> extends Node {
-  T get value;
-}

graphql_parser/lib/src/language/ast/value_or_variable.dart

@@ -1,16 +0,0 @@
-import 'node.dart';
-import 'package:source_span/source_span.dart';
-import 'value.dart';
-import 'variable.dart';
-
-class ValueOrVariableContext extends Node {
-  final ValueContext value;
-  final VariableContext variable;
-
-  ValueOrVariableContext(this.value, this.variable) {
-    assert(value != null || variable != null);
-  }
-
-  @override
-  FileSpan get span => value?.span ?? variable.span;
-}