public Expression Compile(IEnumerable<Expression> expressions, Expression parentContext)
{
try
{
if (expressions.Any() == false)
{
return _emptyLambda;
}
if (expressions.IsOneOf<Expression, DefaultExpression>() == true)
{
return _emptyLambda;
}
var compilationContext = new CompilationContext(_configuration);
var expression = CreateExpressionBlock(expressions);
expression = StaticReplacer.Replace(expression, compilationContext);
expression = PartialBinder.Bind(expression, compilationContext);
expression = IteratorBinder.Bind(expression, compilationContext);
expression = BlockHelperFunctionBinder.Bind(expression, compilationContext);
expression = DeferredSectionVisitor.Bind(expression, compilationContext);
expression = HelperFunctionBinder.Bind(expression, compilationContext);
expression = BoolishConverter.Convert(expression, compilationContext);
expression = PathBinder.Bind(expression, compilationContext);
expression = ContextBinder.Bind(expression, compilationContext, parentContext);
return expression;
}
catch (Exception ex)
{
throw new HandlebarsCompilerException("An unhandled exception occurred while trying to compile the template", ex);
}
}
public static Expression Bind(Expression body, CompilationContext context, Expression parentContext)
{
var writerParameter = Expression.Parameter(typeof(TextWriter), "buffer");
var objectParameter = Expression.Parameter(typeof(object), "data");
if (parentContext == null)
{
parentContext = Expression.Constant(null, typeof(BindingContext));
}
var newBindingContext = Expression.New(
typeof(BindingContext).GetConstructor(
new[] { typeof(object), typeof(TextWriter), typeof(BindingContext) }),
new Expression[] { objectParameter, Expression.Call(new Func<TextWriter, TextWriter>(GetEncodedWriter).Method,writerParameter), parentContext });
return Expression.Lambda<Action<TextWriter, object>>(
Expression.Block(
new [] { context.BindingContext },
new Expression[] {
Expression.IfThenElse(
Expression.TypeIs(objectParameter, typeof(BindingContext)),
Expression.Assign(context.BindingContext, Expression.TypeAs(objectParameter, typeof(BindingContext))),
Expression.Assign(context.BindingContext, newBindingContext))
}.Concat(
((BlockExpression)body).Expressions
)),
new[] { writerParameter, objectParameter });
}
public static Expression Bind(Expression expr, CompilationContext context)
{
return new PartialBinder(context).Visit(expr);
}
private PartialBinder(CompilationContext context)
{
_context = context;
}
public static Expression Bind(Expression expr, CompilationContext context)
{
return new BlockHelperFunctionBinder(context).Visit(expr);
}
private BlockHelperFunctionBinder(CompilationContext context)
{
_context = context;
}
public static Expression Replace(Expression expr, CompilationContext context)
{
return new StaticReplacer(context).Visit(expr);
}
private StaticReplacer(CompilationContext context)
{
_context = context;
}
private DeferredSectionVisitor(CompilationContext context)
{
_context = context;
}
public static Expression Bind(Expression expr, CompilationContext context)
{
return new DeferredSectionVisitor(context).Visit(expr);
}
public static Expression Convert(Expression expr, CompilationContext context)
{
return new BoolishConverter(context).Visit(expr);
}
private BoolishConverter(CompilationContext context)
{
_context = context;
}
private IteratorBinder(CompilationContext context)
{
_context = context;
}
private PathBinder(CompilationContext context)
{
_context = context;
}
private IteratorBinder(CompilationContext context)
{
_context = context;
}
public static Expression Bind(Expression expr, CompilationContext context)
{
return(new IteratorBinder(context).Visit(expr));
}