103 lines
3.7 KiB
C#
103 lines
3.7 KiB
C#
using System;
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using System.Text.RegularExpressions;
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using UnityEngine.UIElements;
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namespace UnityEditor.Searcher
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{
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static class SearcherHighlighter
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{
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const char k_StartHighlightSeparator = '{';
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const char k_EndHighlightSeparator = '}';
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const string k_HighlightedStyleClassName = "Highlighted";
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public static void HighlightTextBasedOnQuery(VisualElement container, string text, string query)
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{
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var formattedText = text;
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var queryParts = query.Split(new[] {" "}, StringSplitOptions.RemoveEmptyEntries);
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var regex = string.Empty;
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for (var index = 0; index < queryParts.Length; index++)
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{
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var queryPart = queryParts[index];
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regex += $"({Regex.Escape(queryPart)})";
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if (index < queryParts.Length - 1)
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regex += "|";
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}
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var matches = Regex.Matches(formattedText, regex, RegexOptions.IgnoreCase);
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foreach (Match match in matches)
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{
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formattedText = formattedText.Replace(match.Value,
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$"{k_StartHighlightSeparator}{match.Value}{k_EndHighlightSeparator}");
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}
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BuildHighlightLabels(container, formattedText);
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}
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static void BuildHighlightLabels(VisualElement container, string formattedHighlightText)
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{
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if (string.IsNullOrEmpty(formattedHighlightText))
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return;
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var substring = string.Empty;
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var highlighting = false;
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var skipCount = 0;
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foreach (var character in formattedHighlightText.ToCharArray())
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{
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switch (character)
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{
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// Skip embedded separators
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// Ex:
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// Query: middle e
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// Text: Middle Eastern
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// Formatted Text: {Middl{e}} {E}ast{e}rn
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// ^ ^
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case k_StartHighlightSeparator when highlighting:
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skipCount++;
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continue;
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case k_StartHighlightSeparator: {
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highlighting = true;
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if (!string.IsNullOrEmpty(substring))
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{
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var label = new Label(substring);
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#if UNITY_6000_0_OR_NEWER
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label.style.whiteSpace = WhiteSpace.Pre;
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#endif
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container.Add(label);
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substring = string.Empty;
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}
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continue;
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}
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case k_EndHighlightSeparator when skipCount > 0:
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skipCount--;
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continue;
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case k_EndHighlightSeparator: {
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var label = new Label(substring);
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label.AddToClassList(k_HighlightedStyleClassName);
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#if UNITY_6000_0_OR_NEWER
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label.style.whiteSpace = WhiteSpace.Pre;
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#endif
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container.Add(label);
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highlighting = false;
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substring = string.Empty;
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continue;
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}
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default:
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substring += character;
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break;
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}
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}
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if (!string.IsNullOrEmpty(substring))
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{
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var label = new Label(substring);
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if (highlighting)
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label.AddToClassList(k_HighlightedStyleClassName);
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container.Add(label);
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}
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}
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}
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}
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