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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.
FreightLanguageCompiler.zip
FreightLanguageCompiler
bin
Debug
FreightLanguageCompiler.dll
Irony.dll
Nodes
Properties
ExampleSite
App_Data
Bin
FreightLanguageCompiler.dll
Irony.dll
FLSnippets
IronySnippets.snippet
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<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;
    }
    
    
    </script>
    <style type="text/css">
		body 
		{
			font-family: Arial;
		}
		h1 
		{
			color: Navy;
		}
		td input 
		{
			width: 30px;
		}
		
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
		<h1>Freight Language Demo Page</h1>
		
		<p>To see what this page is about, <a href="">view the article</a>.</p>
    
		<h2>Input</h2>
		
		<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>
		
		<div>
			<asp:TextBox ID="javascriptTextBox" runat="server" Rows="18" TextMode="MultiLine" 
				Width="90%" ReadOnly="true"></asp:TextBox><br />
		</div>
		
		<h2>Sample input</h2>
		
		<div>
			Customer type: 
			<select id="customerDropdown"><option value="vip">VIP</option><option value="normal">Normal</option></select>
		</div>
		
		<div>
			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>
		</div>
		
		<div>
			Products ordered:
			<table>
				<thead>
					<tr>
						<th>Quantity</th>
						<th>Product Name</th>
						<th>Weight</th>
					</tr>
				</thead>
				<tbody>
					<tr>
						<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>
					</tr>
					<tr>
						<td><input type="text" id="quantity1" value="1" /></td>
						<td>Keyboard</td>
						<td><input type="hidden" id="weight1" value="0.2" />0.2</td>
					</tr>
					<tr>
						<td><input type="text" id="quantity2" value="1" /></td>
						<td>Computer</td>
						<td><input type="hidden" id="weight2" value="10.4" />10.4</td>
					</tr>
					<tr>
						<td><input type="text" id="quantity3" value="1" /></td>
						<td>Monitor</td>
						<td><input type="hidden" id="weight3" value="5.3" />5.3</td>
					</tr>
				</tbody>
			</table>
			
		</div>
		
		<div>
			<input type="button" onclick="calculateFreight();" value="Calculate freight" />
		</div>
		
    </div>
    </form>
</body>
</html>

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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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