更新异步step

DoRunner/DefineVariableRunner.cs

@@ -1,5 +1,6 @@
 using Convention.RScript.Parser;
 using System;
+using System.Collections;
 using System.Diagnostics.CodeAnalysis;
 
 namespace Convention.RScript.Runner
@@ -123,5 +124,63 @@ namespace Convention.RScript.Runner
             }
             return null;
         }
+
+        [return: MaybeNull]
+        public IEnumerator RunAsync(ExpressionParser parser, RScriptSentence sentence, RScriptContext context)
+        {
+            // 定义变量
+            var varTypeName = sentence.info[0];
+            var varName = sentence.info[1];
+            var varInitExpression = sentence.info[2];
+            Type varType;
+            object varDefaultValue;
+            {
+                if (varTypeName == "string")
+                {
+                    varType = typeof(string);
+                    varDefaultValue = varInitExpression == null ? string.Empty : varInitExpression.Trim('\"');
+                }
+                else if (varTypeName == "int")
+                {
+                    varType = typeof(int);
+                    varDefaultValue = varInitExpression == null ? 0 : Convert.ChangeType(parser.Evaluate(varInitExpression), typeof(int));
+                }
+                else if (varTypeName == "double")
+                {
+                    varType = typeof(double);
+                    varDefaultValue = varInitExpression == null ? 0.0 : Convert.ChangeType(parser.Evaluate(varInitExpression), typeof(double));
+                }
+                else if (varTypeName == "float")
+                {
+                    varType = typeof(float);
+                    varDefaultValue = varInitExpression == null ? 0.0f : Convert.ChangeType(parser.Evaluate(varInitExpression), typeof(float));
+                }
+                else if (varTypeName == "bool")
+                {
+                    varType = typeof(bool);
+                    varDefaultValue = varInitExpression == null ? false : Convert.ChangeType(parser.Evaluate(varInitExpression), typeof(bool));
+                }
+                else if (varTypeName == "var")
+                {
+                    varType = typeof(object);
+                    varDefaultValue = varInitExpression == null ? new object() : parser.Evaluate(varInitExpression);
+                }
+                else
+                {
+                    throw new RScriptRuntimeException($"Unsupported variable type '{varTypeName}'.", context.CurrentRuntimePointer);
+                }
+            }
+            if (context.CurrentLocalSpaceVariableNames.Peek().Contains(varName) == false)
+            {
+                context.Variables.Add(varName, new(varType, varDefaultValue));
+                parser.context.Variables[varName] = varDefaultValue;
+                context.CurrentLocalSpaceVariableNames.Peek().Add(varName);
+            }
+            else
+            {
+                throw new RScriptRuntimeException($"Variable '{varName}' already defined on this namespace.", context.CurrentRuntimePointer);
+            }
+            yield break;
+        }
     }
 }