120 lines
3.9 KiB
C#
120 lines
3.9 KiB
C#
using System.Collections.Generic;
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using System.Globalization;
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namespace AibisDream.MiniGame.Language
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{
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/// <summary>
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/// 将玩家可见文字按 Unicode 文本元素拆分。
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/// 空白保留在布局中但不生成粒子；随机字符池直接忽略空白。
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/// </summary>
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public static class ExpressionTextTokenizer
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{
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public readonly struct Layout
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{
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public Layout(List<string> visibleElements, List<float> offsets)
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{
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VisibleElements = visibleElements;
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Offsets = offsets;
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}
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public IReadOnlyList<string> VisibleElements { get; }
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public IReadOnlyList<float> Offsets { get; }
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public int Count => VisibleElements?.Count ?? 0;
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}
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public static List<string> GetVisibleElements(string text)
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{
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var result = new List<string>();
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if (string.IsNullOrEmpty(text))
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return result;
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TextElementEnumerator enumerator = StringInfo.GetTextElementEnumerator(text);
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while (enumerator.MoveNext())
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{
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string element = enumerator.GetTextElement();
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if (!string.IsNullOrWhiteSpace(element))
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result.Add(element);
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}
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return result;
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}
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public static List<string> BuildCharacterPool(IEnumerable<string> texts)
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{
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var result = new List<string>();
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if (texts == null)
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return result;
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foreach (string text in texts)
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result.AddRange(GetVisibleElements(text));
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return result;
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}
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public static Layout BuildLayout(
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string text,
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float characterSpacing,
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float whitespaceSpacingMultiplier)
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{
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var visible = new List<string>();
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var positions = new List<float>();
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if (string.IsNullOrEmpty(text))
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return new Layout(visible, positions);
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float spacing = characterSpacing > 0f ? characterSpacing : 1f;
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float whitespaceAdvance = spacing * whitespaceSpacingMultiplier;
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float cursor = 0f;
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TextElementEnumerator enumerator = StringInfo.GetTextElementEnumerator(text);
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while (enumerator.MoveNext())
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{
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string element = enumerator.GetTextElement();
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if (string.IsNullOrWhiteSpace(element))
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{
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if (visible.Count > 0)
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cursor += whitespaceAdvance;
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continue;
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}
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visible.Add(element);
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positions.Add(cursor);
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cursor += spacing;
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}
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if (positions.Count > 0)
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{
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float center = (positions[0] + positions[positions.Count - 1]) * 0.5f;
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for (int i = 0; i < positions.Count; i++)
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positions[i] -= center;
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}
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return new Layout(visible, positions);
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}
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public static int FindVisibleSequence(
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IReadOnlyList<string> source,
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IReadOnlyList<string> fragment)
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{
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if (source == null || fragment == null || fragment.Count == 0 || fragment.Count > source.Count)
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return -1;
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int lastStart = source.Count - fragment.Count;
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for (int start = 0; start <= lastStart; start++)
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{
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bool matches = true;
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for (int i = 0; i < fragment.Count; i++)
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{
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if (!string.Equals(source[start + i], fragment[i], System.StringComparison.Ordinal))
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{
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matches = false;
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break;
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}
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}
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if (matches)
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return start;
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}
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return -1;
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}
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}
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}
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