rewrite removed font references for compatibility

1 files changed, 78 insertions, 0 deletions

diff --git a/src/StardewModdingAPI.AssemblyRewriters/Rewriters/FieldReplaceRewriter.cs b/src/StardewModdingAPI.AssemblyRewriters/Rewriters/FieldReplaceRewriter.cs
new file mode 100644
index 00000000..31f9a40f
--- /dev/null
+++ b/src/StardewModdingAPI.AssemblyRewriters/Rewriters/FieldReplaceRewriter.cs
@@ -0,0 +1,78 @@
+using System;
+using System.Reflection;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using StardewModdingAPI.AssemblyRewriters.Framework;
+
+namespace StardewModdingAPI.AssemblyRewriters.Rewriters
+{
+    /// <summary>Rewrites references to one field with another.</summary>
+    public class FieldReplaceRewriter : BaseFieldRewriter
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The type whose field to which references should be rewritten.</summary>
+        private readonly Type Type;
+
+        /// <summary>The field name to rewrite.</summary>
+        private readonly string FromFieldName;
+
+        /// <summary>The new field name to reference.</summary>
+        private readonly string ToFieldName;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
+        public override string NounPhrase { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="type">The type whose field to which references should be rewritten.</param>
+        /// <param name="fromFieldName">The field name to rewrite.</param>
+        /// <param name="toFieldName">The new field name to reference.</param>
+        /// <param name="nounPhrase">A brief noun phrase indicating what the instruction finder matches (or <c>null</c> to generate one).</param>
+        public FieldReplaceRewriter(Type type, string fromFieldName, string toFieldName, string nounPhrase = null)
+        {
+            this.Type = type;
+            this.FromFieldName = fromFieldName;
+            this.ToFieldName = toFieldName;
+            this.NounPhrase = nounPhrase ?? $"{type.Name}.{fromFieldName} field";
+        }
+
+
+        /*********
+        ** Protected methods
+        *********/
+        /// <summary>Get whether a field reference should be rewritten.</summary>
+        /// <param name="instruction">The IL instruction.</param>
+        /// <param name="fieldRef">The field reference.</param>
+        /// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
+        protected override bool IsMatch(Instruction instruction, FieldReference fieldRef, bool platformChanged)
+        {
+            return
+                fieldRef.DeclaringType.FullName == this.Type.FullName
+                && fieldRef.Name == this.FromFieldName;
+        }
+
+        /// <summary>Rewrite a method for compatibility.</summary>
+        /// <param name="module">The module being rewritten.</param>
+        /// <param name="cil">The CIL rewriter.</param>
+        /// <param name="instruction">The instruction which references the field.</param>
+        /// <param name="fieldRef">The field reference invoked by the <paramref name="instruction"/>.</param>
+        /// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
+        protected override void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, FieldReference fieldRef, PlatformAssemblyMap assemblyMap)
+        {
+            FieldInfo field = this.Type.GetField(this.ToFieldName);
+            if(field == null)
+                throw new InvalidOperationException($"The {this.Type.FullName} class doesn't have a {this.ToFieldName} field.");
+            FieldReference newRef = module.Import(field);
+            cil.Replace(instruction, cil.Create(instruction.OpCode, newRef));
+        }
+    }
+}