interactive/src/Microsoft.DotNet.Interactive.Http.Parsing/Parsing/HttpRootSyntaxNode.cs at ef14f097a91cb142a27017130baeef3977fe6f16 · dotnet/interactive · GitHub

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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

#nullable enable

using Microsoft.CodeAnalysis.Text;
using Microsoft.DotNet.Interactive.Http.Parsing.Parsing;
using System.Collections.Generic;
using System.Linq;
using Microsoft.DotNet.Interactive.Parsing;
using System.Text;

namespace Microsoft.DotNet.Interactive.Http.Parsing;

using Diagnostic = CodeAnalysis.Diagnostic;

internal class HttpRootSyntaxNode : HttpSyntaxNode
{
    internal HttpRootSyntaxNode(SourceText sourceText, HttpSyntaxTree tree) : base(sourceText, tree)
    {
    }

    public void Add(HttpRequestNode requestNode)
    {
        AddInternal(requestNode);
    }

    public void Add(HttpCommentNode commentNode)
    {
        AddInternal(commentNode);
    }

    public void Add(HttpVariableDeclarationAndAssignmentNode variableNode)
    {
        AddInternal(variableNode);
    }

    public void Add(HttpRequestSeparatorNode separatorNode)
    {
        AddInternal(separatorNode);
    }

    public (Dictionary<string, DeclaredVariable> declaredVariables, List<Diagnostic>? diagnostics) TryGetDeclaredVariables(HttpBindingDelegate? bind = null)
    {
        var variableAndDeclarationNodes = ChildNodes.OfType<HttpVariableDeclarationAndAssignmentNode>();

        List<Diagnostic>? diagnostics = null;

        var foundVariableValues = new Dictionary<string, string>();
        var declaredVariables = new Dictionary<string, DeclaredVariable>();

        foreach (var node in variableAndDeclarationNodes)
        {
            if (node.ValueNode is not null && node.DeclarationNode is not null)
            {
                var embeddedExpressionNodes = node.ValueNode.ChildNodes.OfType<HttpEmbeddedExpressionNode>();
                var potentialEscapedCharacters = node.ValueNode.ChildNodes.OfType<HttpEscapedCharacterSequenceNode>();
                if (potentialEscapedCharacters.Any())
                {
                    StringBuilder sb = new StringBuilder();
                    foreach (var child in node.ValueNode.ChildNodesAndTokens)
                    {
                        if (child is HttpEscapedCharacterSequenceNode sequenceNode)
                        {
                            sb.Append(sequenceNode.UnescapedText);
                        }
                        else
                        {
                            sb.Append(child.Text);
                        }
                    }

                    var value = sb.ToString();
                    foundVariableValues[node.DeclarationNode.VariableName] = value;
                    declaredVariables[node.DeclarationNode.VariableName] = new DeclaredVariable(node.DeclarationNode.VariableName, value, HttpBindingResult<string>.Success(Text));
            }
            else if (!embeddedExpressionNodes.Any())
            {
                foundVariableValues[node.DeclarationNode.VariableName] = node.ValueNode.Text;
                declaredVariables[node.DeclarationNode.VariableName] = new DeclaredVariable(node.DeclarationNode.VariableName, node.ValueNode.Text, HttpBindingResult<string>.Success(Text));
            }
            else
            {
                var value = node.ValueNode.TryGetValue(node =>
                {
                    if (foundVariableValues.TryGetValue(node.Text, out string? stringValue))
                    {
                        return node.CreateBindingSuccess(stringValue);
                    }
                    else if (bind != null)
                    {
                        return bind(node);
                    }
                    else
                    {
                        return DynamicExpressionUtilities.ResolveExpressionBinding(node, node.Text);
                    }

                });

                if (value?.Value != null)
                {
                    declaredVariables[node.DeclarationNode.VariableName] = new DeclaredVariable(node.DeclarationNode.VariableName, value.Value, value);
                }
                else
                {
                    if(diagnostics is null)
                    {
                        diagnostics = value?.Diagnostics;
                    }
                    else
                    {
                        if (value is not null)
                        {
                            diagnostics.AddRange(value.Diagnostics);
                        }

                    }
                }
            }
            }
        }

        return (declaredVariables, diagnostics);
    }
}