简化公式

Author: toolgood

csharp/ToolGood.Algorithm2.Test/AlgorithmEngine/AlgorithmEngineTest.cs

@@ -260,9 +260,23 @@ public void Cylinder_Test()
 
             String tt2 = c.EvaluateFormula("'圆'-[半径]-高", '-');
             Assert.AreEqual("圆-3-10", tt2);
+        }
 
+        [Test]
+        public void Test5555()
+        {
+            Cylinder c = new Cylinder(3, 10);
+            String t = c.GetSimplifiedFormula("[半径]*[半径]*pi()"); // 圆底面积
+            Assert.AreEqual("3 * 3 * 3.141592653589793", t);
+
+            String t2 = c.GetSimplifiedFormula("半径*if(半径>2,1,3)");
+            Assert.AreEqual("3 * 1", t2);
+
+            String t24 = c.GetSimplifiedFormula("半径*if(半径>2,1+4,3)");
+            Assert.AreEqual("3 * 5", t24);
 
         }
 
+
     }
 }

csharp/ToolGood.Algorithm2/AlgorithmEngine.cs

@@ -55,7 +55,7 @@ public AlgorithmEngine(bool ignoreCase)
             } else {
                 _tempdict = new Dictionary<string, Operand>();
             }
-        } 
+        }
         #endregion
 
 
@@ -353,7 +353,7 @@ public bool Parse(string exp)
             _context = context;
             return true;
         }
- 
+
         /// <summary>
         /// 执行函数
         /// </summary>
@@ -710,6 +710,37 @@ public MyDate TryEvaluate_MyDate(string exp, MyDate def)
         }
         #endregion
 
+        #region GetSimplifiedFormula
+        /// <summary>
+        /// 获取简化公式
+        /// </summary>
+        /// <param name="String"></param>
+        /// <param name=""></param>
+        /// <returns></returns>
+        public String GetSimplifiedFormula(String formula)
+        {
+            try {
+                if (Parse(formula)) {
+                    MathSimplifiedFormulaVisitor visitor = new MathSimplifiedFormulaVisitor();
+                    visitor.GetParameter += GetDiyParameterInside;
+                    visitor.excelIndex = UseExcelIndex ? 1 : 0;
+                    visitor.DiyFunction += ExecuteDiyFunction;
+
+                    Operand obj = visitor.Visit(_context);
+                    obj = obj.ToText("It can't be converted to String!");
+                    if (obj.IsError) {
+                        LastError = obj.ErrorMsg;
+                        return null;
+                    }
+                    return obj.TextValue;
+                }
+            } catch (Exception ex) {
+                LastError = ex.Message;
+            }
+            return null;
+        }
+        #endregion
+
         #region EvaluateFormula
         /// <summary>
         /// 计算公式

csharp/ToolGood.Algorithm2/AlgorithmEngineEx.cs

@@ -1066,6 +1066,36 @@ public MyDate TryEvaluate_MyDate(string exp, MyDate def)
 
 
 
+        #endregion
+
+        #region GetSimplifiedFormula
+        /// <summary>
+        /// 获取简化公式
+        /// </summary>
+        /// <param name="formula">公式</param>
+        /// <returns></returns>
+        public String GetSimplifiedFormula(String formula)
+        {
+            try {
+                ProgContext _context = Parse(formula);
+                MathSimplifiedFormulaVisitor visitor = new MathSimplifiedFormulaVisitor();
+                visitor.GetParameter += GetDiyParameterInside;
+                visitor.excelIndex = UseExcelIndex ? 1 : 0;
+                visitor.DiyFunction += ExecuteDiyFunction;
+
+                Operand obj = visitor.Visit(_context);
+                obj = obj.ToText("It can't be converted to String!");
+                if (obj.IsError) {
+                    LastError = obj.ErrorMsg;
+                    return null;
+                }
+                return obj.TextValue;
+
+            } catch (Exception ex) {
+                LastError = ex.Message;
+            }
+            return null;
+        }
         #endregion
 
         #region EvaluateFormula