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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace QtVsTools.SyntaxAnalysis
{
/// <summary>
/// Alternating composition
/// </summary>
public partial class RegExprChoice : RegExpr
{
public IEnumerable<RegExpr> Exprs { get; set; }
protected override IEnumerable<RegExpr> OnRender(RegExpr defaultTokenWs, RegExpr parent,
StringBuilder pattern, ref RenderMode mode, Stack<Token> tokenStack)
{
base.OnRender(defaultTokenWs, parent, pattern, ref mode, tokenStack);
if (parent is not Token)
pattern.Append("(?:");
pattern.Append("(?:");
return Exprs;
}
protected override void OnRenderNext(RegExpr defaultTokenWs, RegExpr parent,
StringBuilder pattern, ref RenderMode mode, Stack<Token> tokenStack)
{
base.OnRenderNext(defaultTokenWs, parent, pattern, ref mode, tokenStack);
pattern.Append(")|(?:");
}
protected override void OnRenderEnd(RegExpr defaultTokenWs, RegExpr parent,
StringBuilder pattern, ref RenderMode mode, Stack<Token> tokenStack)
{
base.OnRenderEnd(defaultTokenWs, parent, pattern, ref mode, tokenStack);
pattern.Append(")");
if (parent is not Token)
pattern.Append(")");
}
}
public abstract partial class RegExpr
{
public static RegExpr Choice(params RegExpr[] rxs)
{
return new RegExprChoice
{
Exprs = rxs.SelectMany(rx => rx is RegExprChoice choice
? choice.Exprs
: Items(rx))
};
}
public static RegExpr operator |(RegExpr rx1, RegExpr rx2)
{
return Choice(rx1, rx2);
}
}
}
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