XmlSyntaxData.cs

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

using Microsoft.Language.Xml;
using System;
using System.Collections.Generic;
using System.Linq;

namespace XmlSyntaxVisualizerUwp
{
    /// <summary>
    /// Data class used to expose interesting Xml <see cref="SyntaxNode"/> properties to the UI.
    /// </summary>
    public class XmlSyntaxData
    {
        public int HashId { get; set; }
        public string Type { get; set; }
        public string TypeClass { get; set; }
        public string Text { get; set; }
        public List<XmlSyntaxError> Errors { get; set; }
        public int SpanStart { get; set; }
        public int SpanEnd { get; set; }

        public int Length => SpanEnd - SpanStart;
        public bool IsError => Errors != null && Errors.Count() > 0;
        public string ErrorText => IsError ? string.Join(' ', Errors.Select(e => e.Id.ToString().Substring(4) + ": " + e.Description)) : string.Empty;

        // Hierarchical reference for TreeView templates
        public List<XmlSyntaxData> Children { get; set; }

        /// <summary>
        /// Reads in a <see cref="SyntaxNode"/> and returns a <see cref="XmlSyntaxData"/>
        /// </summary>
        /// <param name="node">Parsed Xml Node</param>
        /// <param name="withChildren">Include children in this new node.</param>
        /// <returns>UI ready data.</returns>
        public static XmlSyntaxData FromNode(SyntaxNode node, bool withChildren = true)
        {
            return new XmlSyntaxData()
            {
                HashId = node.GetHashCode(),
                Type = node.IsList ? "SyntaxList" : node.GetType().Name,
                TypeClass = node.IsList ? "list" : (node.IsToken ? "token" : "syntax"),
                Text = node.IsToken ? (node as SyntaxToken).Text : string.Empty,
                Errors = node.ContainsDiagnostics ?
                    node.GetDiagnostics().Select(d => new XmlSyntaxError()
                    {
                        Id = d.ErrorID,
                        Description = d.GetDescription()
                    }).ToList()
                    : Array.Empty<XmlSyntaxError>().ToList(),
                SpanStart = node.FullSpan.Start,
                SpanEnd = node.FullSpan.End,
                Children = withChildren ? node.ChildNodes.Select(child => XmlSyntaxData.FromNode(child)).ToList() : Array.Empty<XmlSyntaxData>().ToList()
            };
        }
    }
}