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XmlParser.cs
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XmlParser.cs
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using System.Xml;
using BlocklyNet.Core.Blocks.Variables;
using BlocklyNet.Core.Model;
namespace BlocklyNet.Core;
/// <summary>
///
/// </summary>
public class XmlParser : Parser<XmlParser>
{
/// <inheritdoc/>
public override Workspace Parse(string xml, bool preserveWhitespace = false)
{
var xdoc = new XmlDocument { PreserveWhitespace = preserveWhitespace };
xdoc.LoadXml(xml);
var workspace = new Workspace();
foreach (XmlNode node in xdoc.DocumentElement!.ChildNodes)
{
if (node.LocalName == "block" || node.LocalName == "shadow")
{
var block = ParseBlock(node);
if (null != block)
workspace.Blocks.Add(block);
}
else
{
// Fast-Solution :-)
// Global variables should be parsed, else the assessment of any global variable in the script will cause an Application Exception("unexpected value type") exception.
// only global variables should be parsed in this context.
if (node.LocalName != "variables" || node.FirstChild == null ||
string.IsNullOrWhiteSpace(node.FirstChild.InnerText))
continue;
foreach (XmlNode nodeChild in node.ChildNodes)
{
if (nodeChild.LocalName != "variable" ||
string.IsNullOrWhiteSpace(nodeChild.InnerText))
continue;
// Generate variable members
var block = new GlobalVariablesSet();
var field = new Field
{
Name = "VAR",
Value = nodeChild.InnerText,
};
block.Fields.Add(field);
var value = new Value { Name = "VALUE", Block = null };
block.Values.Add(value);
workspace.Blocks.Add(block);
}
}
}
return workspace;
}
private Block? ParseBlock(XmlNode node)
{
var type = node.GetAttribute("type");
if (!blocks.ContainsKey(type))
throw new ApplicationException($"block type not registered: '{type}'");
var block = blocks[type]();
block.Enabled = node.GetAttribute("disabled-reasons") == null;
block.Id = node.GetAttribute("id");
block.Type = type;
foreach (XmlNode childNode in node.ChildNodes)
{
switch (childNode.LocalName)
{
case "mutation":
ParseMutation(childNode, block);
break;
case "field":
ParseField(childNode, block);
break;
case "value":
ParseValue(childNode, block);
break;
case "statement":
ParseStatement(childNode, block);
break;
case "comment":
ParseComment(childNode, block);
break;
case "next":
var nextBlock = ParseBlock(childNode.FirstChild!);
if (null != nextBlock)
block.Next = nextBlock;
break;
default:
throw new ArgumentException($"unknown xml type: {childNode.LocalName}");
}
}
return block;
}
private static void ParseField(XmlNode fieldNode, Block block)
{
var field = new Field
{
Name = fieldNode.GetAttribute("name"),
Value = fieldNode.InnerText
};
block.Fields.Add(field);
}
private void ParseValue(XmlNode valueNode, Block block)
{
var childNode = valueNode.GetChild("block") ?? valueNode.GetChild("shadow");
if (childNode == null)
return;
var childBlock = ParseBlock(childNode)!;
var value = new Value
{
Name = valueNode.GetAttribute("name"),
Block = childBlock
};
block.Values.Add(value);
}
private static void ParseComment(XmlNode commentNode, Block block)
{
block.Comments.Add(new Comment(commentNode.InnerText));
}
private void ParseStatement(XmlNode statementNode, Block block)
{
var childNode = statementNode.GetChild("block") ?? statementNode.GetChild("shadow");
if (childNode == null)
return;
var childBlock = ParseBlock(childNode);
var statement = new Statement
{
Name = statementNode.GetAttribute("name"),
Block = childBlock
};
block.Statements.Add(statement);
}
private static void ParseMutation(XmlNode mutationNode, Block block)
{
foreach (XmlAttribute attribute in mutationNode.Attributes!)
{
block.Mutations.Add(new Mutation("mutation", attribute.Name, attribute.Value));
}
foreach (XmlNode node in mutationNode.ChildNodes)
{
foreach (XmlAttribute attribute in node.Attributes!)
{
block.Mutations.Add(new Mutation(node.Name, attribute.Name, attribute.Value));
}
}
}
}
internal static class XmlParserExtensions
{
public static XmlNode? GetChild(this XmlNode node, string name)
{
foreach (XmlNode childNode in node.ChildNodes)
{
if (childNode.LocalName == name)
return childNode;
}
return null;
}
public static string GetAttribute(this XmlNode node, string name)
{
foreach (XmlAttribute attribute in node.Attributes!)
{
if (attribute.Name == name)
return attribute.Value;
}
return null!;
}
}