同步

Packages/dev.yarnspinner.unity/Runtime/Views/StyleMarkerProcessor.cs

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+/*
+Yarn Spinner is licensed to you under the terms found in the file LICENSE.md.
+*/
+
+using System.Collections.Generic;
+using System.Text;
+using UnityEngine;
+using Yarn.Markup;
+
+#nullable enable
+
+namespace Yarn.Unity
+{
+    /// <summary>
+    /// An attribute marker processor that inserts TextMeshPro style tags where
+    /// Yarn Spinner <c>[style]</c> tags appear in a line.
+    /// </summary>
+    public sealed class StyleMarkerProcessor : ReplacementMarkupHandler
+    {
+        [SerializeField]
+        public LineProviderBehaviour? lineProvider;
+
+        /// <inheritdoc/>
+        public override ReplacementMarkerResult ProcessReplacementMarker(MarkupAttribute marker, StringBuilder childBuilder, List<MarkupAttribute> childAttributes, string localeCode)
+        {
+            // ok so we check if we have a property called style
+            // if not give up
+            if (!marker.TryGetProperty("style", out string? property))
+            {
+                var error = new List<LineParser.MarkupDiagnostic>
+                {
+                    new LineParser.MarkupDiagnostic("Unable to identify a name for the style.")
+                };
+                return new ReplacementMarkerResult(error, 0);
+            }
+
+            var originalLength = childBuilder.Length;
+
+            childBuilder.Insert(0, $"<style=\"{property}\">");
+            childBuilder.Append("</style>");
+
+            // at this point we have no errors
+            // but it is entirely possible that style has added visible characters
+            // we have no way of knowing this
+            // so if this is the case any attributes will now be off
+            // unfortunately that is a downside to using the style replacement system
+            // most of the time this won't be a problem
+            return new ReplacementMarkerResult(childBuilder.Length - originalLength);
+        }
+
+        // Start is called before the first frame update
+        void Start()
+        {
+            if (lineProvider == null)
+            {
+                var runner = DialogueRunner.FindRunner(this);
+                if (runner == null)
+                {
+                    Debug.LogWarning("Was unable to find a dialogue runner, unable to register the style markup.");
+                    return;
+                }
+                lineProvider = (LineProviderBehaviour)runner.LineProvider;
+            }
+            lineProvider.RegisterMarkerProcessor("style", this);
+
+            // in an ideal world instead of making you write out [style = h1] you could just do [h1]
+            // but TMP doesn't allow access to the list of styles, and as such also can't get their names
+            // so we have no way of know what the names of any style to register them
+            // alas
+        }
+    }
+}