Refactoring Rendering backend

Ghost.Shader/ParserBlock/ShaderBlock.cs

@@ -0,0 +1,43 @@
+namespace Ghost.Shader.ParserBlock;
+
+internal class ShaderBlock : IBlockParser<ShaderSyntax>
+{
+    public static bool ShouldEnter(Token token)
+    {
+        return token.Match(TokenType.Keyword, TokenLexicon.KnownKeywords.SHADER);
+    }
+
+    public static ShaderSyntax Parse(TokenStreamSlice stream)
+    {
+        var shader = new ShaderSyntax();
+
+        stream.Expect(TokenType.Keyword);
+        shader.name = stream.Expect(TokenType.StringLiteral);
+        stream.Expect(TokenType.LBrace);
+
+        var bodyStream = stream.Slice(stream.Remaining - 1);
+        while (bodyStream.TryPeek(out var nextToken))
+        {
+            if (PropertiesBlock.ShouldEnter(nextToken))
+            {
+                shader.properties = PropertiesBlock.Parse(bodyStream.SliceNextBlock());
+            }
+            else if (PipelineBlock.ShouldEnter(nextToken))
+            {
+                shader.pipeline = PipelineBlock.Parse(bodyStream.SliceNextBlock());
+            }
+            else if (PassBlock.ShouldEnter(nextToken))
+            {
+                shader.passes.Add(PassBlock.Parse(bodyStream.SliceNextBlock()));
+            }
+            else
+            {
+                throw new Exception($"Unexpected token '{nextToken.lexeme}' in shader body.");
+            }
+        }
+
+        stream.Expect(TokenType.RBrace);
+
+        return shader;
+    }
+}