Canon/Canon.Core/SyntaxNodes/Period.cs
jackfiled 5e3ea6303e refact: syntax-node (#23)
重构语法树的部分,使用单独的类来抽象不同的非终结符节点。
**同时**,将`Pascal`语法的定义从测试项目中移动到核心项目中,在项目中只维护一份对于`Pascal`语法的定义。

Reviewed-on: PostGuard/Canon#23
2024-04-07 16:47:28 +08:00

70 lines
1.8 KiB
C#

using Canon.Core.Enums;
using Canon.Core.LexicalParser;
namespace Canon.Core.SyntaxNodes;
public class Period : NonTerminatedSyntaxNode
{
public override NonTerminatorType Type => NonTerminatorType.Period;
public bool IsRecursive { get; private init; }
/// <summary>
/// 数组上下界列表
/// </summary>
public IEnumerable<(NumberSemanticToken, NumberSemanticToken)> Ranges => GetRanges();
public static Period 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 Period { Children = children, IsRecursive = isRecursive };
}
private (NumberSemanticToken, NumberSemanticToken) GetRange()
{
if (IsRecursive)
{
return ((NumberSemanticToken)Children[2].Convert<TerminatedSyntaxNode>().Token,
(NumberSemanticToken)Children[4].Convert<TerminatedSyntaxNode>().Token);
}
else
{
return ((NumberSemanticToken)Children[0].Convert<TerminatedSyntaxNode>().Token,
(NumberSemanticToken)Children[2].Convert<TerminatedSyntaxNode>().Token);
}
}
private IEnumerable<(NumberSemanticToken, NumberSemanticToken)> GetRanges()
{
Period period = this;
while (true)
{
if (period.IsRecursive)
{
yield return period.GetRange();
period = period.Children[0].Convert<Period>();
}
else
{
yield return period.GetRange();
break;
}
}
}
}