public static IteratorExpression Iterator(
Expression sequence,
BlockParamsExpression blockParams,
Expression template)
{
return(new IteratorExpression(sequence, blockParams, template, Empty()));
}
public IteratorExpression(Expression sequence, BlockParamsExpression blockParams, Expression template, Expression ifEmpty)
: base("each", Enumerable.Empty <Expression>(), blockParams, template, ifEmpty, false)
{
Sequence = sequence;
Template = template;
IfEmpty = ifEmpty;
}
public static IteratorExpression Iterator(
string helperName,
Expression sequence,
BlockParamsExpression blockParams,
Expression template)
{
return(new IteratorExpression(helperName, sequence, blockParams, template, Empty()));
}
public BlockHelperExpression(
string helperName,
IEnumerable <Expression> arguments,
Expression body,
Expression inversion,
bool isRaw = false)
: this(helperName, arguments, BlockParamsExpression.Empty(), body, inversion, isRaw)
{
}
public static BlockHelperExpression BlockHelper(
string helperName,
IEnumerable <Expression> arguments,
BlockParamsExpression blockParams,
Expression body,
Expression inversion,
bool isRaw = false)
{
return(new BlockHelperExpression(helperName, arguments, blockParams, body, inversion, isRaw));
}
public BlockHelperExpression(
string helperName,
IEnumerable <Expression> arguments,
BlockParamsExpression blockParams,
Expression body,
Expression inversion,
bool isRaw = false)
: base(helperName, true, arguments, isRaw)
{
Body = body;
Inversion = inversion;
BlockParams = blockParams;
IsBlock = true;
}
public override Expression GetAccumulatedBlock()
{
if (_accumulatedBody == null)
{
_accumulatedBody = GetBlockBody();
_accumulatedInversion = Expression.Block(Expression.Empty());
}
else if (_accumulatedInversion == null)
{
_accumulatedInversion = GetBlockBody();
}
var resultExpr = HandlebarsExpression.BlockHelper(
_startingNode.HelperName,
_startingNode.Arguments.Where(o => o.NodeType != (ExpressionType)HandlebarsExpressionType.BlockParamsExpression),
_startingNode.Arguments.OfType <BlockParamsExpression>().SingleOrDefault() ?? BlockParamsExpression.Empty(),
_accumulatedBody,
_accumulatedInversion,
_startingNode.IsRaw);
if (_startingNode.IsRaw)
{
return(HandlebarsExpression.Statement(
resultExpr,
false,
_trimBefore,
_trimAfter));
}
return(resultExpr);
}
public override bool IsClosingElement(Expression item)
{
if (IsClosingNode(item))
{
// If the template has no content within the block, e.g. `{{#each ...}}{{/each}`, then the block body is a no-op.
var bodyStatements = _body.Count != 0 ? _body : new List <Expression> {
Expression.Empty()
};
if (_accumulatedExpression == null)
{
_accumulatedExpression = HandlebarsExpression.Iterator(
_startingNode.Arguments.Single(o => o.NodeType != (ExpressionType)HandlebarsExpressionType.BlockParamsExpression),
_startingNode.Arguments.OfType <BlockParamsExpression>().SingleOrDefault() ?? BlockParamsExpression.Empty(),
Expression.Block(bodyStatements));
}
else
{
_accumulatedExpression = HandlebarsExpression.Iterator(
((IteratorExpression)_accumulatedExpression).Sequence,
((IteratorExpression)_accumulatedExpression).BlockParams,
((IteratorExpression)_accumulatedExpression).Template,
Expression.Block(bodyStatements));
}
return(true);
}
else
{
return(false);
}
}
public override void HandleElement(Expression item)
{
if (IsElseBlock(item))
{
_accumulatedExpression = HandlebarsExpression.Iterator(
_startingNode.Arguments.Single(o => o.NodeType != (ExpressionType)HandlebarsExpressionType.BlockParamsExpression),
_startingNode.Arguments.OfType <BlockParamsExpression>().SingleOrDefault() ?? BlockParamsExpression.Empty(),
Expression.Block(_body));
_body = new List <Expression>();
}
else
{
_body.Add((Expression)item);
}
}
public IteratorExpression(Expression sequence, Expression template, Expression ifEmpty)
: this(sequence, BlockParamsExpression.Empty(), template, ifEmpty)
{
}