BadInsertNodeTransformer.cs

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using System.Collections.Generic;
 
using BadScript2.Runtime;
using BadScript2.Runtime.Error;
 
using HtmlAgilityPack;
 
namespace BadHtml.Transformer;
 
public class BadInsertNodeTransformer : BadHtmlNodeTransformer
{
    protected override bool CanTransform(BadHtmlContext context)
    {
        return context.InputNode.Name == "bs:insert";
    }
 
 
    private static IEnumerable<HtmlNode> GetNodes(BadHtmlContext context, string path, bool global)
    {
        if (path.StartsWith("#"))
        {
            yield return context.OutputDocument.GetElementbyId(path.Remove(0, 1));
        }
        else
        {
            HtmlNode? root = global ? context.OutputDocument.DocumentNode : context.OutputNode;
 
            foreach (HtmlNode node in root.SelectNodes(path))
            {
                yield return node;
            }
        }
    }
 
    protected override void TransformNode(BadHtmlContext context)
    {
        HtmlAttribute? pathAttribute = context.InputNode.Attributes["into"];
        bool isGlobal = context.InputNode.Attributes["global"]?.Value != "false";
 
        if (pathAttribute == null)
        {
            throw BadRuntimeException.Create(
                context.ExecutionContext.Scope,
                "Missing 'into' attribute in 'bs:insert' node",
                context.CreateOuterPosition()
            );
        }
 
        string? path = pathAttribute.Value;
 
        if (string.IsNullOrEmpty(path))
        {
            throw BadRuntimeException.Create(
                context.ExecutionContext.Scope,
                "Empty 'into' attribute in 'bs:insert' node",
                context.CreateAttributePosition(pathAttribute)
            );
        }
 
 
        foreach (HtmlNode outputNode in GetNodes(context, path, isGlobal))
        {
            if (outputNode == null)
            {
                continue;
            }
 
            foreach (HtmlNode node in context.InputNode.ChildNodes)
            {
                using BadExecutionContext exCtx = new BadExecutionContext(context.ExecutionContext.Scope.CreateChild("bs:insert", context.ExecutionContext.Scope, null));
                BadHtmlContext ctx = context.CreateChild(
                    node,
                    outputNode,
                    exCtx
                );
                Transform(ctx);
            }
        }
    }
}