private void CompileExpression(XPathExpr expr)
{
switch (expr.Type)
{
case XPathExprType.Or:
this.CompileBoolean(expr, false);
break;
case XPathExprType.And:
this.CompileBoolean(expr, true);
break;
case XPathExprType.Relational:
this.CompileRelational((XPathRelationExpr)expr);
break;
case XPathExprType.Union:
{
XPathConjunctExpr expr2 = (XPathConjunctExpr)expr;
this.CompileExpression(expr2.Left);
this.CompileExpression(expr2.Right);
this.codeBlock.Append(new UnionOpcode());
break;
}
case XPathExprType.LocationPath:
if (expr.SubExprCount > 0)
{
this.CompileLocationPath(expr);
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
case XPathExprType.RelativePath:
this.CompileRelativePath(expr, true);
break;
case XPathExprType.XsltVariable:
this.CompileXsltVariable((XPathXsltVariableExpr)expr);
break;
case XPathExprType.String:
this.codeBlock.Append(new PushStringOpcode(((XPathStringExpr)expr).String));
break;
case XPathExprType.Number:
{
XPathNumberExpr expr3 = (XPathNumberExpr)expr;
double number = expr3.Number;
if (expr3.Negate)
{
expr3.Negate = false;
number = -number;
}
this.codeBlock.Append(new PushNumberOpcode(number));
break;
}
case XPathExprType.Function:
this.CompileFunction((XPathFunctionExpr)expr);
break;
case XPathExprType.XsltFunction:
this.CompileXsltFunction((XPathXsltFunctionExpr)expr);
break;
case XPathExprType.Math:
this.CompileMath((XPathMathExpr)expr);
break;
case XPathExprType.Filter:
this.CompileFilter(expr);
if (expr.ReturnType == ValueDataType.Sequence)
{
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
case XPathExprType.Path:
this.CompilePath(expr);
if ((expr.SubExprCount == 0) && (expr.ReturnType == ValueDataType.Sequence))
{
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
default:
this.ThrowError(QueryCompileError.UnsupportedExpression);
break;
}
this.NegateIfRequired(expr);
}
void CompileExpression(XPathExpr expr)
{
Fx.Assert(null != expr, "");
switch (expr.Type)
{
default:
this.ThrowError(QueryCompileError.UnsupportedExpression);
break;
case XPathExprType.And:
this.CompileBoolean(expr, true);
break;
case XPathExprType.Or:
this.CompileBoolean(expr, false);
break;
case XPathExprType.Relational:
this.CompileRelational((XPathRelationExpr)expr);
break;
case XPathExprType.Function:
this.CompileFunction((XPathFunctionExpr)expr);
break;
case XPathExprType.Union:
{
XPathConjunctExpr unionExpr = (XPathConjunctExpr)expr;
this.CompileExpression(unionExpr.Left);
this.CompileExpression(unionExpr.Right);
this.codeBlock.Append(new UnionOpcode());
}
break;
case XPathExprType.RelativePath:
this.CompileRelativePath(expr, true);
break;
case XPathExprType.LocationPath:
if (expr.SubExprCount > 0)
{
this.CompileLocationPath(expr);
// Step complete. Transfer results onto the value stack
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
case XPathExprType.Math:
this.CompileMath((XPathMathExpr)expr);
break;
case XPathExprType.Number:
XPathNumberExpr number = (XPathNumberExpr)expr;
double literal = number.Number;
if (number.Negate)
{
number.Negate = false;
literal = -literal;
}
this.codeBlock.Append(new PushNumberOpcode(literal));
break;
case XPathExprType.String:
this.codeBlock.Append(new PushStringOpcode(((XPathStringExpr)expr).String));
break;
case XPathExprType.Filter:
this.CompileFilter(expr);
if (expr.ReturnType == ValueDataType.Sequence)
{
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
case XPathExprType.Path:
this.CompilePath(expr);
if (expr.SubExprCount == 0 && expr.ReturnType == ValueDataType.Sequence)
{
this.codeBlock.Append(new PopSequenceToValueStackOpcode());
}
break;
case XPathExprType.XsltFunction:
this.CompileXsltFunction((XPathXsltFunctionExpr)expr);
break;
case XPathExprType.XsltVariable:
this.CompileXsltVariable((XPathXsltVariableExpr)expr);
break;
}
NegateIfRequired(expr);
}