|
public AddLocal ( string name, |
||
| name | string | |
| type | ||
| Результат | System.Linq.Expressions.ParameterExpression | |
Expr IStatementVisitor <Expr> .Visit(Statement.LocalAssign statement)
{
var values = WrapWithVarargsFirst(statement.Values);
var locals = statement.Identifiers.Select(v => scope.AddLocal(v)).ToList();
if (statement.Values.Last().IsVarargs() || statement.Values.Last().IsFunctionCall())
{
return(VarargsExpandAssignment(locals, values));
}
return(AssignWithTemporaries(locals, values, Expr.Assign));
}
Expr IStatementVisitor <Expr> .Visit(Statement.ForIn statement)
{
var iterFuncVar = Expr.Variable(typeof(object));
var iterStateVar = Expr.Variable(typeof(object));
var iterableVar = Expr.Variable(typeof(object));
var iterVars = new[] { iterFuncVar, iterStateVar, iterableVar };
var valueExprs = statement.Values.Select(v => Expr.Convert(v.Visit(this), typeof(object)));
var assignIterVars = VarargsExpandAssignment(iterVars, valueExprs);
var parentScope = scope;
scope = Scope.CreateChild(scope);
var locals = statement.Identifiers.Select(id => scope.AddLocal(id)).ToList();
var invokeIterFunc = Expr.Dynamic(Context.DynamicCache.GetInvokeBinder(new CallInfo(2)),
typeof(object), iterFuncVar, iterStateVar, iterableVar);
var loop =
Expr.Loop(
Expr.Block(
locals,
VarargsExpandAssignment(
locals,
new[] { invokeIterFunc }),
Expr.IfThen(Expr.Equal(locals[0], Expr.Constant(null)), Expr.Break(scope.BreakLabel())),
Visit(statement.Body)),
scope.BreakLabel());
var expr = Expr.Block(iterVars, assignIterVars, loop);
scope = parentScope;
return(expr);
}
Expr IStatementVisitor <Expr> .Visit(Statement.For statement)
{
var parentScope = scope;
scope = Scope.CreateChild(parentScope);
var step = statement.Step == null
? new Expression.Number(1.0).Visit(this)
: ExprHelpers.ConvertToNumber(context, statement.Step.Visit(this));
var loopVariable = scope.AddLocal(statement.Identifier);
var varVar = Expr.Variable(typeof(double));
var limitVar = Expr.Variable(typeof(double));
var stepVar = Expr.Variable(typeof(double));
var breakConditionExpr = ForLoopBreakCondition(limitVar, stepVar, varVar);
var expr =
Expr.Block(
new[] { loopVariable, varVar, limitVar, stepVar },
Expr.Assign(varVar, ExprHelpers.ConvertToNumber(context, statement.Var.Visit(this))),
Expr.Assign(limitVar, ExprHelpers.ConvertToNumber(context, statement.Limit.Visit(this))),
Expr.Assign(stepVar, step),
ExprHelpers.CheckNumberForNan(varVar, String.Format(ExceptionMessage.FOR_VALUE_NOT_NUMBER, "inital value")),
ExprHelpers.CheckNumberForNan(limitVar, String.Format(ExceptionMessage.FOR_VALUE_NOT_NUMBER, "limit")),
ExprHelpers.CheckNumberForNan(stepVar, String.Format(ExceptionMessage.FOR_VALUE_NOT_NUMBER, "step")),
ForLoop(statement, stepVar, loopVariable, varVar, breakConditionExpr));
scope = parentScope;
return(expr);
}
Expr Visit(string name, FunctionBody function)
{
var parentScope = scope;
scope = Scope.CreateFunctionChild(scope);
var parameters = function.Parameters.Select(p => scope.AddLocal(p)).ToList();
if (function.Varargs)
{
parameters.Add(scope.AddLocal(Constant.VARARGS, typeof(Varargs)));
}
var bodyExpr = Expr.Block(Visit(function.Body), Expr.Label(scope.GetReturnLabel(), Expr.Constant(null)));
var lambdaExpr = Expr.Lambda(bodyExpr, Constant.FUNCTION_PREFIX + name, parameters);
scope = parentScope;
return(lambdaExpr);
}
