76 lines
2.0 KiB
C#
76 lines
2.0 KiB
C#
using Canon.Core.CodeGenerators;
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using Canon.Core.Enums;
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using Canon.Core.LexicalParser;
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namespace Canon.Core.SyntaxNodes;
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public class IdentifierList : NonTerminatedSyntaxNode
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{
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public override NonTerminatorType Type => NonTerminatorType.IdentifierList;
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/// <summary>
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/// 是否含有递归定义
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/// </summary>
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public bool IsRecursive { get; private init; }
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/// <summary>
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/// 声明的标识符列表
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/// </summary>
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public IEnumerable<IdentifierSemanticToken> Identifiers => GetIdentifiers();
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public static IdentifierList Create(List<SyntaxNodeBase> children)
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{
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bool isRecursive;
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if (children.Count == 1)
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{
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isRecursive = false;
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}
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else if (children.Count == 3)
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{
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isRecursive = true;
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}
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else
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{
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throw new InvalidOperationException();
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}
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return new IdentifierList { IsRecursive = isRecursive, Children = children };
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}
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private IEnumerable<IdentifierSemanticToken> GetIdentifiers()
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{
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IdentifierList identifier = this;
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while (true)
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{
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if (identifier.IsRecursive)
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{
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yield return (IdentifierSemanticToken)identifier.Children[2].Convert<TerminatedSyntaxNode>().Token;
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identifier = identifier.Children[0].Convert<IdentifierList>();
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}
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else
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{
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yield return (IdentifierSemanticToken)identifier.Children[0].Convert<TerminatedSyntaxNode>().Token;
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break;
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}
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}
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}
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public override void GenerateCCode(CCodeBuilder builder)
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{
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//用逗号分隔输出的expression
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using var enumerator = Identifiers.Reverse().GetEnumerator();
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if (enumerator.MoveNext())
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{
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builder.AddString(" " + enumerator.Current.IdentifierName);
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}
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while (enumerator.MoveNext())
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{
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builder.AddString(", " + enumerator.Current.IdentifierName);
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}
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}
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}
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