63 lines
2.0 KiB
C#
63 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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using Canon.Core.SemanticParser;
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namespace Canon.Core.SyntaxNodes;
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public class Variable : NonTerminatedSyntaxNode
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{
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public override NonTerminatorType Type => NonTerminatorType.Variable;
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/// <summary>
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/// 变量的名称
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/// </summary>
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public IdentifierSemanticToken Identifier =>
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(IdentifierSemanticToken)Children[0].Convert<TerminatedSyntaxNode>().Token;
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public static Variable Create(List<SyntaxNodeBase> children)
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{
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return new Variable { Children = children };
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}
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public override void GenerateCCode(CCodeBuilder builder)
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{
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//判断是否为引用变量
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builder.SymbolTable.TryGetSymbol(Identifier.IdentifierName, out var symbol);
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if (symbol is not null && symbol.Reference)
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{
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builder.AddString(" (*" + Identifier.IdentifierName + ")");
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}
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else
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{
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builder.AddString(" " + Identifier.IdentifierName);
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}
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//处理idVarPart（数组下标部分）
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var idVarPart = Children[1].Convert<IdentifierVarPart>();
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if (idVarPart.Exist)
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{
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PascalArrayType pascalArrayType = (PascalArrayType)symbol.SymbolType;
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var positions = idVarPart.Positions;
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foreach (var pos in positions.Reverse())
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{
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builder.AddString("[");
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pos.GenerateCCode(builder);
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//pascal下标减去左边界，从而映射到C语言的下标
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builder.AddString(" - " + System.Convert.ToString(pascalArrayType.Begin) + "]");
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try
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{
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pascalArrayType = (PascalArrayType)pascalArrayType.ElementType;
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}
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catch (InvalidCastException e)
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{
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//do nothing
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//因为最后一层嵌套类型，必然不是PascalArrayType, 而是BasicType
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}
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}
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}
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}
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}
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