106 lines
3.6 KiB
C#
106 lines
3.6 KiB
C#
// This file is part of YamlDotNet - A .NET library for YAML.
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// Copyright (c) Antoine Aubry and contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using YamlDotNet.Core;
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namespace YamlDotNet.Serialization.ObjectGraphVisitors
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{
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public sealed class AnchorAssigner : PreProcessingPhaseObjectGraphVisitorSkeleton, IAliasProvider
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{
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private class AnchorAssignment
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{
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public AnchorName Anchor;
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}
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private readonly IDictionary<object, AnchorAssignment> assignments = new Dictionary<object, AnchorAssignment>();
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private uint nextId;
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public AnchorAssigner(IEnumerable<IYamlTypeConverter> typeConverters)
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: base(typeConverters)
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{
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}
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protected override bool Enter(IObjectDescriptor value)
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{
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if (value.Value != null && assignments.TryGetValue(value.Value, out var assignment))
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{
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if (assignment.Anchor.IsEmpty)
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{
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assignment.Anchor = new AnchorName("o" + nextId.ToString(CultureInfo.InvariantCulture));
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++nextId;
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}
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return false;
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}
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return true;
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}
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protected override bool EnterMapping(IObjectDescriptor key, IObjectDescriptor value)
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{
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return true;
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}
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protected override bool EnterMapping(IPropertyDescriptor key, IObjectDescriptor value)
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{
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return true;
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}
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protected override void VisitScalar(IObjectDescriptor scalar)
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{
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// Do not assign anchors to scalars
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}
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protected override void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType)
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{
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VisitObject(mapping);
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}
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protected override void VisitMappingEnd(IObjectDescriptor mapping) { }
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protected override void VisitSequenceStart(IObjectDescriptor sequence, Type elementType)
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{
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VisitObject(sequence);
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}
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protected override void VisitSequenceEnd(IObjectDescriptor sequence) { }
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private void VisitObject(IObjectDescriptor value)
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{
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if (value.Value != null)
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{
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assignments.Add(value.Value, new AnchorAssignment());
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}
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}
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AnchorName IAliasProvider.GetAlias(object target)
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{
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if (target != null && assignments.TryGetValue(target, out var assignment))
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{
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return assignment.Anchor;
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}
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return AnchorName.Empty;
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}
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}
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}
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