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Operand.cs
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Operand.cs
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using System;
namespace CriteriaExpression
{
class Operand
{
private Token _value;
internal Operand _parent;
internal Operand _left;
internal Operand _right;
public Token Token
{
get { return _value; }
}
public Operand Parent
{
get { return _parent; }
}
public Operand Left
{
get { return _left; }
}
public Operand Right
{
get { return _right; }
}
internal bool IsLeft
{
get
{
if (_parent != null)
{
return _parent._left == this;
}
return false;
}
}
internal Operand(Token value, Operand parent)
{
_parent = parent;
_value = value;
}
public Token Solve()
{
return Solve(this);
}
static private Token Solve(Operand op)
{
if (op == null)
throw new InvalidProgramException("syntax error");
switch (op.Token.Type)
{
case TokenType.Boolean:
return op.Token;
case TokenType.Number:
return op.Token;
case TokenType.String:
return op.Token;
case TokenType.Prefix:
if (op.Right != null)
{
Token value = Solve(op.Right);
switch (op.Token.Lexeme)
{
case "!":
return !value;
case "-":
return -value;
default:
throw new InvalidProgramException("unknown prefix '" + op.Token.Lexeme + "'");
}
}
throw new InvalidProgramException("syntax error");
case TokenType.Operation:
if ((op.Left != null) && (op.Right != null))
{
Token left = Solve(op.Left);
Token right = Solve(op.Right);
switch (op.Token.Lexeme)
{
case "?":
if (left)
{
return right;
}
return false;
case "||":
if (left)
{
return true;
}
return right;
case "&&":
if (!left)
{
return false;
}
return right;
case "==":
return left.Equals(right);
case "!=":
return !left.Equals(right);
case ">=":
return left >= right;
case ">":
return left > right;
case "<=":
return left <= right;
case "<":
return left < right;
case "+":
return left + right;
case "-":
return left - right;
case "*":
return left * right;
case "/":
return left / right;
case "%":
return left % right;
default:
throw new InvalidProgramException("unknown operator '" + op.Token.Lexeme + "'");
}
}
throw new InvalidProgramException("syntax error");
case TokenType.Expression:
return Solve(op.Left);
}
return Token.Null;
}
}
}