Canon/Canon.Core/SyntaxNodes/ConstDeclaration.cs

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using Canon.Core.Enums;
using Canon.Core.LexicalParser;
namespace Canon.Core.SyntaxNodes;
public class ConstDeclaration : NonTerminatedSyntaxNode
{
public override NonTerminatorType Type => NonTerminatorType.ConstDeclaration;
/// <summary>
/// 是否递归的声明下一个ConstDeclaration
/// </summary>
public bool IsRecursive { get; private init; }
/// <summary>
/// 获得声明的常量
/// </summary>
public (IdentifierSemanticToken, ConstValue) ConstValue => GetConstValue();
public static ConstDeclaration Create(List<SyntaxNodeBase> children)
{
bool isRecursive;
if (children.Count == 3)
{
isRecursive = false;
}
else if (children.Count == 5)
{
isRecursive = true;
}
else
{
throw new InvalidOperationException();
}
return new ConstDeclaration { Children = children, IsRecursive = isRecursive };
}
private static IdentifierSemanticToken ConvertToIdentifierSemanticToken(SyntaxNodeBase node)
{
return (IdentifierSemanticToken)node.Convert<TerminatedSyntaxNode>().Token;
}
private (IdentifierSemanticToken, ConstValue) GetConstValue()
{
if (IsRecursive)
{
return (ConvertToIdentifierSemanticToken(Children[2]), Children[4].Convert<ConstValue>());
}
else
{
return (ConvertToIdentifierSemanticToken(Children[0]), Children[2].Convert<ConstValue>());
}
}
}