Migrate to PEG parser. Introduce boolean operators and constants.

samples/CommunityToolkit.Maui.Sample/Pages/Converters/MultiMathExpressionConverterPage.xaml

@@ -15,63 +15,86 @@
         </ResourceDictionary>
     </pages:BasePage.Resources>
 
-    <Grid Padding="20"
-          RowSpacing="20"
-          ColumnSpacing="12"
-          ColumnDefinitions="*,*,*,*,*,*,*"
-          RowDefinitions="100, *">
-        <Label Grid.ColumnSpan="7"
-               Grid.Row="0"
-               Text="This sample demonstrates the use of the MultiMathExpressionConverter. It utilizes the converter to perform various math operations of multiple variables."/>
+    <VerticalStackLayout Padding="20" Spacing="40">
 
-        <Entry Grid.Column="0"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="{Binding X0}"/>
+        <Grid RowSpacing="20"
+              ColumnSpacing="12"
+              ColumnDefinitions="*,*,*,*,*,*,*"
+              RowDefinitions="100, *">
+            <Label Grid.ColumnSpan="7"
+                   Grid.Row="0"
+                   Text="This sample demonstrates the use of the MultiMathExpressionConverter. It utilizes the converter to perform various math operations of multiple variables."/>
 
-        <Label Grid.Column="1"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="+" />
+            <Entry Grid.Column="0"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="{Binding X0}"/>
 
-        <Entry Grid.Column="2"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="{Binding X1}"/>
+            <Label Grid.Column="1"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="+" />
 
-        <Label Grid.Column="3"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="+" />
+            <Entry Grid.Column="2"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="{Binding X1}"/>
 
-        <Entry Grid.Column="4"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="{Binding X2}"/>
+            <Label Grid.Column="3"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="+" />
 
-        <Label Grid.Column="5"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center"
-               Text="=" />
+            <Entry Grid.Column="4"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="{Binding X2}"/>
 
-        <Label Grid.Column="6"
-               Grid.Row="1"
-               VerticalTextAlignment="Center"
-               VerticalOptions="Center">
-             <Label.Text>
-                <MultiBinding Converter="{StaticResource MultiMathExpressionConverter}"
-                              ConverterParameter="x0 + x1 + x2">
-                    <Binding Path="X0" Mode="OneWay"/>
-                    <Binding Path="X1" Mode="OneWay"/>
-                    <Binding Path="X2" Mode="OneWay"/>
-                </MultiBinding>
-            </Label.Text>           
+            <Label Grid.Column="5"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center"
+                   Text="=" />
+
+            <Label Grid.Column="6"
+                   Grid.Row="1"
+                   VerticalTextAlignment="Center"
+                   VerticalOptions="Center">
+                 <Label.Text>
+                    <MultiBinding Converter="{StaticResource MultiMathExpressionConverter}"
+                                  ConverterParameter="x0 + x1 + x2">
+                        <Binding Path="X0" Mode="OneWay"/>
+                        <Binding Path="X1" Mode="OneWay"/>
+                        <Binding Path="X2" Mode="OneWay"/>
+                    </MultiBinding>
+                </Label.Text>           
+            </Label>
+        </Grid>
+
+        <Label HorizontalOptions="Center"
+               Text="Valid: Value greater than or equal to 60"
+               TextColor="Green">
+            <Label.Triggers>
+                <DataTrigger TargetType="Label" Value="False">
+                    <DataTrigger.Binding>
+                        <MultiBinding Converter="{StaticResource MultiMathExpressionConverter}"
+                                      ConverterParameter="x0 + x1 + x2 &gt;= 60">
+                            <Binding Path="X0" Mode="OneWay"/>
+                            <Binding Path="X1" Mode="OneWay"/>
+                            <Binding Path="X2" Mode="OneWay"/>
+                       </MultiBinding>
+                    </DataTrigger.Binding>
+                    <Setter Property="Text" Value="Error: Value not greater than or equal to 60"/>
+                    <Setter Property="TextColor" Value="Red"/>
+                </DataTrigger>
+            </Label.Triggers>
         </Label>
-    </Grid>
+
+    </VerticalStackLayout>
+
 </pages:BasePage>

src/CommunityToolkit.Maui.Core/Primitives/MathOperator.shared.cs

@@ -14,7 +14,7 @@ public enum MathOperatorPrecedence
 	/// <summary>High</summary>
 	High,
 	/// <summary>Constant</summary>
-	Constant,
+	Constant
 }
 
 /// <summary>
@@ -25,31 +25,25 @@ public enum MathOperatorPrecedence
 /// </remarks>
 /// <param name="name">Name</param>
 /// <param name="numericCount">Number of Numerals</param>
-/// <param name="precedence">Math Operator Preference</param>
 /// <param name="calculateFunc">Calculation Function</param>
 public sealed class MathOperator(
-	string name,
-	int numericCount,
-	MathOperatorPrecedence precedence,
-	Func<double[], double> calculateFunc)
+    string name,
+    int numericCount,
+    Func<object?[], object?> calculateFunc)
 {
-	/// <summary>
-	/// Name
-	/// </summary>
-	public string Name { get; } = name;
 
-	/// <summary>
-	/// Number of Numerals
-	/// </summary>
-	public int NumericCount { get; } = numericCount;
+    /// <summary>
+    /// Name
+    /// </summary>
+    public string Name { get; } = name;
 
-	/// <summary>
-	/// Math Operator Precedence
-	/// </summary>
-	public MathOperatorPrecedence Precedence { get; } = precedence;
+    /// <summary>
+    /// Number of Numerals
+    /// </summary>
+    public int NumericCount { get; } = numericCount;
 
-	/// <summary>
-	/// Calculation Function
-	/// </summary>
-	public Func<double[], double> CalculateFunc { get; } = calculateFunc;
+    /// <summary>
+    /// Calculation Function
+    /// </summary>
+    public Func<object?[], object?> CalculateFunc { get; } = calculateFunc;
 }