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Posted 3 Sep 2008

Writing your first Domain Specific Language, Part 2 of 2

, 3 Sep 2008
A guide to writing a compiler in .NET for beginners, using Irony.
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "">

<html xmlns="">
<head runat="server">
    <title>FL to JavaScript compilation</title>
    <script type="text/javascript">
    function calculateFreight() {
		var region = getSelectedValue('regionDropdown');
		var customer = getSelectedValue('customerDropdown');
		var items = [];
		for (var i = 0; i < 4; i++) {
			var quantity = document.getElementById('quantity' + i).value;
			var weight = document.getElementById('weight' + i).value;
			items.push( { "weight": weight, "quantity": quantity } );
		var freight = getFreightCost(customer, region, items);
		alert('Freight cost is $' + (Math.round(freight*100)/100));
    function getSelectedValue(selectId) {
		var dropdown = document.getElementById(selectId);
		return dropdown.options[dropdown.selectedIndex].value;
    <style type="text/css">
			font-family: Arial;
			color: Navy;
		td input 
			width: 30px;
    <form id="form1" runat="server">
		<h1>Freight Language Demo Page</h1>
		<p>To see what this page is about, <a href="">view the article</a>.</p>
		<p id="errorMessageParagraph" style="font-weight:bold;color:Red" runat="server" visible="false" enableviewstate="false"></p>
		<asp:TextBox ID="sourceCodeTextBox" runat="server" Rows="18" TextMode="MultiLine" 
			Width="90%"></asp:TextBox><br />
		<asp:Button ID="runButton" runat="server" Text="Convert to JavaScript" onclick="runButton_Click" />
		<h2>Converted to JavaScript:</h2>
			<asp:TextBox ID="javascriptTextBox" runat="server" Rows="18" TextMode="MultiLine" 
				Width="90%" ReadOnly="true"></asp:TextBox><br />
		<h2>Sample input</h2>
			Customer type: 
			<select id="customerDropdown"><option value="vip">VIP</option><option value="normal">Normal</option></select>
			Delivery region: 
			<select id="regionDropdown"><option value="africa">Africa</option><option value="asia">Asia</option><option value="Americas">Americas</option><option value="europe">Europe</option><option value="middleeast">Middle East</option></select>
			Products ordered:
						<th>Product Name</th>
						<td><input type="text" id="quantity0" value="1" /></td>
						<td>External drive</td>
						<td><input type="hidden" id="weight0" value="1.2" />1.2</td>
						<td><input type="text" id="quantity1" value="1" /></td>
						<td><input type="hidden" id="weight1" value="0.2" />0.2</td>
						<td><input type="text" id="quantity2" value="1" /></td>
						<td><input type="hidden" id="weight2" value="10.4" />10.4</td>
						<td><input type="text" id="quantity3" value="1" /></td>
						<td><input type="hidden" id="weight3" value="5.3" />5.3</td>
			<input type="button" onclick="calculateFreight();" value="Calculate freight" />

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About the Author

Daniel Flower
Software Developer
China China
Daniel has a Bachelor of Science with First Class Honours from the University of Auckland, and has designed and developed software in companies large and small.

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