static bool CollapseNonEmpty(object value, string metadata, string property, ITemplater templater)
{
if (metadata == "collapseNonEmpty" || metadata == "collapseEmpty")
{
var dt = value as DataTable;
if (dt == null)
{
return(false);
}
var isEmpty = dt.Rows.Count == 0;
//loop until all tags with the same name are processed
do
{
var md = templater.GetMetadata(property, false);
var collapseOnEmpty = md.Contains("collapseEmpty");
var collapseNonEmpty = md.Contains("collapseNonEmpty");
if (isEmpty)
{
if (collapseOnEmpty)
{
templater.Resize(property, 0);
}
else
{
templater.Replace(property, "");
}
}
else
{
if (collapseNonEmpty)
{
templater.Resize(property, 0);
}
else
{
templater.Replace(property, "");
}
}
} while (templater.Tags.Contains(property));
return(true);
}
return(false);
}
static bool Limit10Table(string prefix, ITemplater templater, DataTable table)
{
if (table.Rows.Count > 10)
{
//simplified way to match columns against tags
var tags = table.Columns.Cast<DataColumn>().Select(it => prefix + it.ColumnName).ToList();
//if any of the found tags matches limit10 condition
if (tags.Any(t => templater.GetMetadata(t, true).Contains("limit10")))
{
templater.Resize(tags, 10);
for (int i = 0; i < 10; i++)
{
DataRow r = table.Rows[i];
foreach (DataColumn c in table.Columns)
templater.Replace(prefix + c.ColumnName, r[c]);
}
return true;
}
}
return false;
}
static bool TopNElementsProcessing(string prefix, ITemplater templater, IList list)
{
foreach (var t in templater.Tags)
{
//if any of the tag metadata contain limit(X), apply limit on the provided list
var limit = templater.GetMetadata(t, true).FirstOrDefault(it => it.StartsWith("limit("));
if (limit != null)
{
int x = int.Parse(limit.Substring(6, limit.Length - 7));
//mutate the object in place... while this is not ideal, it's a convenient way to implement such requirement
//alternative is to replicate Iterable processor features which is not trivial
var size = list.Count - x;
while (size-- > 0)
{
list.RemoveAt(x);
}
}
}
//say that we did not process object, so it's passed down to next processor (built-in)
//which will process it with more complex logic
return(false);
}
static bool Limit10Table(string prefix, ITemplater templater, DataTable table)
{
if (table.Rows.Count > 10)
{
//simplified way to match columns against tags
var tags = table.Columns.Cast <DataColumn>().Select(it => prefix + it.ColumnName).ToList();
//if any of the found tags matches limit10 condition
if (tags.Any(t => templater.GetMetadata(t, true).Contains("limit10")))
{
templater.Resize(tags, 10);
for (int i = 0; i < 10; i++)
{
DataRow r = table.Rows[i];
foreach (DataColumn c in table.Columns)
{
templater.Replace(prefix + c.ColumnName, r[c]);
}
}
return(true);
}
}
return(false);
}
static void RemoveTagsWithMissing(ITemplater templater)
{
foreach (var tag in templater.Tags.ToList())
{
int i = 0;
string[] md;
//metadata will return null when a tag does not exist at that index
while ((md = templater.GetMetadata(tag, i)) != null)
{
var missing = md.FirstOrDefault(it => it.StartsWith("missing("));
if (missing != null)
{
var description = missing.Substring(8, missing.Length - 9);
//Replace tag at specific index, not just the first tag
templater.Replace(tag, i, description);
}
else
{
i++;
}
}
}
}
//for this example position is ignored as it is always -1
static bool CollapseNonEmpty(object value, string metadata, string tag, int position, ITemplater templater)
{
var dt = value as DataTable;
if (dt != null && (metadata == "collapseNonEmpty" || metadata == "collapseEmpty"))
{
var isEmpty = dt.Rows.Count == 0;
//loop until all tags with the same name are processed
do
{
var md = templater.GetMetadata(tag, false);
var collapseOnEmpty = md.Contains("collapseEmpty");
var collapseNonEmpty = md.Contains("collapseNonEmpty");
if (isEmpty)
{
if (collapseOnEmpty)
{
//when position is -1 it means non sharing tag is being used, in which case we can resize that region via "standard" API
//otherwise we need to use "advanced" resize API to specify which exact tag to replace
if (position == -1)
{
templater.Resize(new[] { tag }, 0);
}
else
{
templater.Resize(new[] { new TagPosition(tag, position) }, 0);
}
}
else
{
//when position is -1 it means non sharing tag is being used, in which case we can just replace the first tag
//otherwise we can replace that exact tag via position API
//replacing the first tag is the same as calling replace(tag, 0, value)
if (position == -1)
{
templater.Replace(tag, "");
}
else
{
templater.Replace(tag, position, "");
}
}
}
else
{
if (collapseNonEmpty)
{
if (position == -1)
{
templater.Resize(new[] { tag }, 0);
}
else
{
templater.Resize(new[] { new TagPosition(tag, position) }, 0);
}
}
else
{
if (position == -1)
{
templater.Replace(tag, "");
}
else
{
templater.Replace(tag, position, "");
}
}
}
} while (templater.Tags.Contains(tag));
return(true);
}
return(false);
}
