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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using Microsoft.AspNetCore.Razor.Language.Legacy;
namespace Microsoft.AspNetCore.Razor.Language
{
// Verifies recursively that a syntax tree has no gaps in terms of position/location.
internal class SyntaxTreeVerifier : ParserVisitor
{
private readonly SourceLocationTracker _tracker = new SourceLocationTracker(SourceLocation.Zero);
private SyntaxTreeVerifier()
{
}
public static void Verify(RazorSyntaxTree syntaxTree)
{
Verify(syntaxTree.Root);
}
public static void Verify(Block block)
{
new SyntaxTreeVerifier().VisitBlock(block);
}
public override void VisitSpan(Span span)
{
var start = span.Start;
if (!start.Equals(_tracker.CurrentLocation))
{
throw new InvalidOperationException($"Span starting at {span.Start} should start at {_tracker.CurrentLocation} - {span} ");
}
for (var i = 0; i < span.Symbols.Count; i++)
{
_tracker.UpdateLocation(span.Symbols[i].Content);
}
}
}
}
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