esprima-dotnet/src/Esprima/Ast/BinaryExpression.cs at 9107e160c41fe975546ae7a64979d4c542004583 · jogibear9988/esprima-dotnet · GitHub

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using Esprima.Utils;
using static Esprima.EsprimaExceptionHelper;

namespace Esprima.Ast
{
    public enum BinaryOperator
    {
        [EnumMember(Value = "+")] Plus,
        [EnumMember(Value = "-")] Minus,
        [EnumMember(Value = "*")] Times,
        [EnumMember(Value = "/")] Divide,
        [EnumMember(Value = "%")] Modulo,
        [EnumMember(Value = "==")] Equal,
        [EnumMember(Value = "!=")] NotEqual,
        [EnumMember(Value = ">")] Greater,
        [EnumMember(Value = ">=")] GreaterOrEqual,
        [EnumMember(Value = "<")] Less,
        [EnumMember(Value = "<=")] LessOrEqual,
        [EnumMember(Value = "===")] StrictlyEqual,
        [EnumMember(Value = "!==")] StricltyNotEqual,
        [EnumMember(Value = "&")] BitwiseAnd,
        [EnumMember(Value = "|")] BitwiseOr,
        [EnumMember(Value = "^")] BitwiseXOr,
        [EnumMember(Value = "<<")] LeftShift,
        [EnumMember(Value = ">>")] RightShift,
        [EnumMember(Value = ">>>")] UnsignedRightShift,
        [EnumMember(Value = "instanceof")] InstanceOf,
        [EnumMember(Value = "in")] In,
        [EnumMember(Value = "&&")] LogicalAnd,
        [EnumMember(Value = "||")] LogicalOr,
        [EnumMember(Value = "**")] Exponentiation,
        [EnumMember(Value = "??")] NullishCoalescing
    }

    public sealed class BinaryExpression : Expression
    {
        public readonly BinaryOperator Operator;
        public readonly Expression Left;
        public readonly Expression Right;

        public BinaryExpression(string op, Expression left, Expression right) :
            this(ParseBinaryOperator(op), left, right)
        {
        }

        private BinaryExpression(BinaryOperator op, Expression left, Expression right) :
            base(op == BinaryOperator.LogicalAnd || op == BinaryOperator.LogicalOr || op == BinaryOperator.NullishCoalescing ? Nodes.LogicalExpression : Nodes.BinaryExpression)
        {
            Operator = op;
            Left = left;
            Right = right;
        }

        public static BinaryOperator ParseBinaryOperator(string op)
        {
            return op switch
            {
                "+" => BinaryOperator.Plus,
                "-" => BinaryOperator.Minus,
                "*" => BinaryOperator.Times,
                "/" => BinaryOperator.Divide,
                "%" => BinaryOperator.Modulo,
                "==" => BinaryOperator.Equal,
                "!=" => BinaryOperator.NotEqual,
                ">" => BinaryOperator.Greater,
                ">=" => BinaryOperator.GreaterOrEqual,
                "<" => BinaryOperator.Less,
                "<=" => BinaryOperator.LessOrEqual,
                "===" => BinaryOperator.StrictlyEqual,
                "!==" => BinaryOperator.StricltyNotEqual,
                "&" => BinaryOperator.BitwiseAnd,
                "|" => BinaryOperator.BitwiseOr,
                "^" => BinaryOperator.BitwiseXOr,
                "<<" => BinaryOperator.LeftShift,
                ">>" => BinaryOperator.RightShift,
                ">>>" => BinaryOperator.UnsignedRightShift,
                "instanceof" => BinaryOperator.InstanceOf,
                "in" => BinaryOperator.In,
                "&&" => BinaryOperator.LogicalAnd,
                "||" => BinaryOperator.LogicalOr,
                "**" => BinaryOperator.Exponentiation,
                "??" => BinaryOperator.NullishCoalescing,
                _ => ThrowArgumentOutOfRangeException<BinaryOperator>(nameof(op), "Invalid binary operator: " + op)
            };
        }

        public static string ConvertBinaryOperator(BinaryOperator op)
        {
            return op switch
            {
                BinaryOperator.Plus => "+",
                BinaryOperator.Minus => "-",
                BinaryOperator.Times => "*",
                BinaryOperator.Divide => "/",
                BinaryOperator.Modulo => "%",
                BinaryOperator.Equal => "==",
                BinaryOperator.NotEqual => "!=",
                BinaryOperator.Greater => ">",
                BinaryOperator.GreaterOrEqual => ">=",
                BinaryOperator.Less => "<",
                BinaryOperator.LessOrEqual => "<=",
                BinaryOperator.StrictlyEqual => "===",
                BinaryOperator.StricltyNotEqual => "!==",
                BinaryOperator.BitwiseAnd => "&",
                BinaryOperator.BitwiseOr => "|",
                BinaryOperator.BitwiseXOr => "^",
                BinaryOperator.LeftShift => "<<",
                BinaryOperator.RightShift => ">>",
                BinaryOperator.UnsignedRightShift => ">>>",
                BinaryOperator.InstanceOf => "instanceof",
                BinaryOperator.In => "in",
                BinaryOperator.LogicalAnd => "&&",
                BinaryOperator.LogicalOr => "||",
                BinaryOperator.Exponentiation => "**",
                BinaryOperator.NullishCoalescing => "??",
                _ => ThrowArgumentOutOfRangeException<string>(nameof(op), "Invalid binary operator: " + op)
            };
        }

        public override NodeCollection ChildNodes => new(Left, Right);

        protected internal override void Accept(AstVisitor visitor)
        {
            if (Type == Nodes.LogicalExpression)
            {
                visitor.VisitLogicalExpression(this);
            }
            else
            {
                visitor.VisitBinaryExpression(this);
            }
        }
    }
}