79 lines
3.4 KiB
C#
79 lines
3.4 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 YamlDotNet.Core;
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namespace YamlDotNet.Serialization.ObjectGraphVisitors
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{
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public sealed class AnchorAssigningObjectGraphVisitor : ChainedObjectGraphVisitor
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{
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private readonly IEventEmitter eventEmitter;
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private readonly IAliasProvider aliasProvider;
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private readonly HashSet<AnchorName> emittedAliases = new HashSet<AnchorName>();
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public AnchorAssigningObjectGraphVisitor(IObjectGraphVisitor<IEmitter> nextVisitor, IEventEmitter eventEmitter, IAliasProvider aliasProvider)
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: base(nextVisitor)
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{
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this.eventEmitter = eventEmitter;
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this.aliasProvider = aliasProvider;
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}
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public override bool Enter(IObjectDescriptor value, IEmitter context)
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{
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if (value.Value != null)
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{
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var alias = aliasProvider.GetAlias(value.Value);
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if (!alias.IsEmpty && !emittedAliases.Add(alias))
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{
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var aliasEventInfo = new AliasEventInfo(value, alias);
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eventEmitter.Emit(aliasEventInfo, context);
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return aliasEventInfo.NeedsExpansion;
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}
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}
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return base.Enter(value, context);
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}
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public override void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType, IEmitter context)
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{
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var anchor = aliasProvider.GetAlias(mapping.NonNullValue());
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eventEmitter.Emit(new MappingStartEventInfo(mapping) { Anchor = anchor }, context);
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}
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public override void VisitSequenceStart(IObjectDescriptor sequence, Type elementType, IEmitter context)
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{
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var anchor = aliasProvider.GetAlias(sequence.NonNullValue());
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eventEmitter.Emit(new SequenceStartEventInfo(sequence) { Anchor = anchor }, context);
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}
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public override void VisitScalar(IObjectDescriptor scalar, IEmitter context)
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{
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var scalarInfo = new ScalarEventInfo(scalar);
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if (scalar.Value != null)
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{
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scalarInfo.Anchor = aliasProvider.GetAlias(scalar.Value);
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}
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eventEmitter.Emit(scalarInfo, context);
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}
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}
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}
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