|
public static Boolish ( |
||
| condition | ||
| return | HandlebarsDotNet.Compiler.BoolishExpression | |
public ConditionalBlockAccumulatorContext(Expression startingNode)
: base(startingNode)
{
startingNode = UnwrapStatement(startingNode);
var helperExpression = (HelperExpression)startingNode;
var testType = helperExpression.HelperName[0] == '#' ? TestType.Direct : TestType.Reverse;
BlockName = helperExpression.HelperName.Substring(1, helperExpression.HelperName.Length - 1);
if (!ValidHelperNames.Contains(BlockName))
{
throw new HandlebarsCompilerException($"Tried to convert {BlockName} expression to conditional block", helperExpression.Context);
}
var argument = HandlebarsExpression.Boolish(helperExpression.Arguments.Single());
_currentCondition = BlockName switch
{
"if" when testType == TestType.Direct => argument,
"if" when testType == TestType.Reverse => Expression.Not(argument),
"unless" when testType == TestType.Direct => Expression.Not(argument),
"unless" when testType == TestType.Reverse => argument,
_ => throw new HandlebarsCompilerException($"Tried to convert {BlockName} expression to conditional block", helperExpression.Context)
};
}
protected virtual Expression VisitBoolishExpression(BoolishExpression bex)
{
Expression condition = Visit(bex.Condition);
if (condition != bex.Condition)
{
return(HandlebarsExpression.Boolish(condition));
}
return(bex);
}
public ConditionalBlockAccumulatorContext(Expression startingNode)
: base(startingNode)
{
startingNode = UnwrapStatement(startingNode);
_blockName = ((HelperExpression)startingNode).HelperName.Replace("#", "");
if (new [] { "if", "unless" }.Contains(_blockName) == false)
{
throw new HandlebarsCompilerException(string.Format(
"Tried to convert {0} expression to conditional block", _blockName));
}
_testType = _blockName == "if";
var argument = HandlebarsExpression.Boolish(((HelperExpression)startingNode).Arguments.Single());
_currentCondition = _testType ? (Expression)argument : Expression.Not(argument);
}
public ConditionalBlockAccumulatorContext(Expression startingNode)
: base(startingNode)
{
startingNode = UnwrapStatement(startingNode);
var helperExpression = (HelperExpression)startingNode;
BlockName = helperExpression.HelperName.Replace("#", "");
if (!ValidHelperNames.Contains(BlockName))
{
throw new HandlebarsCompilerException($"Tried to convert {BlockName} expression to conditional block", helperExpression.Context);
}
var testType = BlockName == "if";
var argument = HandlebarsExpression.Boolish(helperExpression.Arguments.Single());
_currentCondition = testType ? (Expression)argument : Expression.Not(argument);
}
private static Expression CreateIfBlock(HelperExpression startingNode, IEnumerable <Expression> body)
{
var condition = HandlebarsExpression.Boolish(startingNode.Arguments.Single());
body = UnwrapBlockExpression(body);
body = body.Concat(new Expression[] { Expression.Empty() });
if (startingNode.HelperName == "#if")
{
return(Expression.IfThen(condition, Expression.Block(body)));
}
else if (startingNode.HelperName == "#unless")
{
return(Expression.IfThen(Expression.Not(condition), Expression.Block(body)));
}
else
{
throw new HandlebarsCompilerException(string.Format(
"Tried to create a conditional expression for '{0}'", startingNode.HelperName));
}
}
private Expression GetElseIfTestExpression(Expression item)
{
item = UnwrapStatement(item);
return(HandlebarsExpression.Boolish(((HelperExpression)item).Arguments.Skip(1).Single()));
}
protected override Expression VisitBoolishExpression(BoolishExpression bex)
{
return(HandlebarsExpression.Boolish(Visit(bex.Condition)));
}