96 lines
4.0 KiB
C#
96 lines
4.0 KiB
C#
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// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do 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 copies or
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// 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 IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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namespace Unity.CodeEditor.Document
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{
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// A tree node in the document line tree.
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// For the purpose of the invariants, "children", "descendents", "siblings" etc. include the DocumentLine object,
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// it is treated as a third child node between left and right.
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partial class DocumentLine
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{
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internal DocumentLine Left { get; set; }
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internal DocumentLine Right { get; set; }
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internal DocumentLine Parent { get; set; }
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internal bool Color { get; set; }
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// optimization note: I tried packing color and isDeleted into a single byte field, but that
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// actually increased the memory requirements. The JIT packs two bools and a byte (delimiterSize)
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// into a single DWORD, but two bytes get each their own DWORD. Three bytes end up in the same DWORD, so
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// apparently the JIT only optimizes for memory when there are at least three small fields.
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// Currently, DocumentLine takes 36 bytes on x86 (8 byte object overhead, 3 pointers, 3 ints, and another DWORD
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// for the small fields).
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// TODO: a possible optimization would be to combine 'totalLength' and the small fields into a single uint.
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// delimiterSize takes only two bits, the two bools take another two bits; so there's still
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// 28 bits left for totalLength. 268435455 characters per line should be enough for everyone :)
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/// <summary>
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/// Resets the line to enable its reuse after a document rebuild.
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/// </summary>
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internal void ResetLine()
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{
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_totalLength = _delimiterLength = 0;
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_isDeleted = Color = false;
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Left = Right = Parent = null;
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}
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internal DocumentLine InitLineNode()
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{
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NodeTotalCount = 1;
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NodeTotalLength = TotalLength;
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return this;
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}
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internal DocumentLine LeftMost
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{
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get
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{
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DocumentLine node = this;
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while (node.Left != null)
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node = node.Left;
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return node;
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}
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}
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internal DocumentLine RightMost
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{
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get
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{
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DocumentLine node = this;
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while (node.Right != null)
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node = node.Right;
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return node;
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}
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}
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/// <summary>
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/// The number of lines in this node and its child nodes.
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/// Invariant:
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/// nodeTotalCount = 1 + left.nodeTotalCount + right.nodeTotalCount
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/// </summary>
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internal int NodeTotalCount { get; set; }
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/// <summary>
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/// The total text length of this node and its child nodes.
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/// Invariant:
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/// nodeTotalLength = left.nodeTotalLength + documentLine.TotalLength + right.nodeTotalLength
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/// </summary>
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internal int NodeTotalLength { get; set; }
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}
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}
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