81 lines
3.1 KiB
C#
81 lines
3.1 KiB
C#
// Copyright (c) 2011, Outercurve Foundation.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// - Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// - Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// - Neither the name of the Outercurve Foundation nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace WebsitePanel.Templates.AST
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{
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internal class UnaryExpression : Expression
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{
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Expression rhs;
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TokenType op;
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public UnaryExpression(int line, int column, TokenType op, Expression rhs)
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: base(line, column)
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{
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this.op = op;
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this.rhs = rhs;
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}
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public TokenType Operator
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{
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get { return op; }
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}
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Expression RightExpression
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{
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get { return rhs; }
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set { rhs = value; }
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}
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public override object Eval(TemplateContext context)
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{
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// evaluate right side
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object val = rhs.Eval(context);
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if (op == TokenType.Minus && val is Decimal)
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return -(Decimal)val;
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else if (op == TokenType.Minus && val is Int32)
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return -(Int32)val;
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else if (op == TokenType.Not && val is Boolean)
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return !(Boolean)val;
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throw new ParserException("Unary operator can be applied to integer, decimal and boolean expressions.", Line, Column);
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}
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public override string ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(Operator).Append("(").Append(RightExpression).Append(")");
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return sb.ToString();
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}
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}
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}
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