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match parsing

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nub31
2026-02-15 04:33:21 +01:00
parent caa3b378b3
commit 1511d5d2b8
2 changed files with 40 additions and 6 deletions
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43
compiler/Parser.cs
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@@ -234,15 +234,34 @@ public class Parser
return new NodeStatementWhile(TokensFrom(startIndex), condition, thenBlock);
}
var target = ParseExpression();
if (TryExpectSymbol(Symbol.Equal))
if (TryExpectKeyword(Keyword.Match))
{
var value = ParseExpression();
return new NodeStatementAssignment(TokensFrom(startIndex), target, value);
var target = ParseExpression();
var cases = new List<NodeStatementMatch.Case>();
ExpectSymbol(Symbol.OpenCurly);
while (!TryExpectSymbol(Symbol.CloseCurly))
{
var caseStartIndex = index;
var name = ExpectIdent();
var body = ParseStatement();
cases.Add(new NodeStatementMatch.Case(TokensFrom(caseStartIndex), name, body));
}
return new NodeStatementMatch(TokensFrom(startIndex), target, cases);
}
return new NodeStatementExpression(TokensFrom(startIndex), target);
{
var target = ParseExpression();
if (TryExpectSymbol(Symbol.Equal))
{
var value = ParseExpression();
return new NodeStatementAssignment(TokensFrom(startIndex), target, value);
}
return new NodeStatementExpression(TokensFrom(startIndex), target);
}
}
private NodeExpression ParseExpression(int minPrecedence = -1)
@@ -753,6 +772,18 @@ public class NodeStatementWhile(List<Token> tokens, NodeExpression condition, No
public NodeStatement Block { get; } = block;
}
public class NodeStatementMatch(List<Token> tokens, NodeExpression target, List<NodeStatementMatch.Case> cases) : NodeStatement(tokens)
{
public NodeExpression Target { get; } = target;
public List<Case> Cases { get; } = cases;
public class Case(List<Token> tokens, TokenIdent type, NodeStatement block) : Node(tokens)
{
public TokenIdent Type { get; } = type;
public NodeStatement Block { get; } = block;
}
}
public abstract class NodeExpression(List<Token> tokens) : Node(tokens);
public class NodeExpressionIntLiteral(List<Token> tokens, TokenIntLiteral value) : NodeExpression(tokens)