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Posted 12 Jun 2010

TinyLisp: A Language and Parser to See LINQ Expressions in Action

, 12 Jun 2010 CPOL
A small program that parses expressions and evaluates them using LINQ Expressions
<Window x:Class="TinyLisp.MainWindow"
        Title="TinyLisp" Height="400" Width="600"
        <!-- Expand all treenodes -->
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
            <ColumnDefinition />
            <ColumnDefinition />
            <RowDefinition Height="46" />
            <RowDefinition Height="18" />
            <RowDefinition Height="432*" />
        <!--First row has input, button and output-->
        <TextBox Grid.Row="0" Grid.Column="0" Name="Input" TextAlignment="Center" VerticalContentAlignment="Center" FontSize="16">(+(/(*3(*2 3 4)) 2) 1 2 3)</TextBox>        
        <Button Content="Evaluate" Grid.Column="1" Click="Button_Click" />
        <!--First colums has the AST-->
        <TextBlock Grid.Column="0" Grid.Row="1" TextAlignment="Center" HorizontalAlignment="Center">Abstract syntax tree</TextBlock>
        <TreeView Name="tvAst" Grid.Row="2" ItemsSource="{Binding}" >
                <HierarchicalDataTemplate ItemsSource="{Binding Operands}" >
                    <TextBlock Text="{Binding Text}"/>

        <!-- Second column has the Linq Expression-->
        <TextBlock Grid.Column="1" Grid.Row="1" HorizontalAlignment="Center">Linq Expression</TextBlock>
        <TreeView Name="tvExpr" Grid.Column="1" Grid.Row="2" ItemsSource="{Binding}" >
                <HierarchicalDataTemplate DataType="x:Type local:ExprWrapper" ItemsSource="{Binding Children}">
                    <TextBlock Text="{Binding Text}" />

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About the Author

Leaseplan Corporation
Netherlands Netherlands
Gert-Jan is a Senior Quantitative Risk Manager at Leaseplan Corporation. In that job he doesn't get to code much he does these little projects to keep his skills up and feed the inner geek.

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