public static List <PageFragment> ParseTemplatePage(StringSegment text)
{
var to = new List <PageFragment>();
if (text.IsNullOrWhiteSpace())
{
return(to);
}
int pos;
var lastPos = 0;
while ((pos = text.IndexOf("{{", lastPos)) != -1)
{
var block = text.Subsegment(lastPos, pos - lastPos);
if (!block.IsNullOrEmpty())
{
to.Add(new PageStringFragment(block));
}
var varStartPos = pos + 2;
var varEndPos = text.IndexOfNextCharNotInObjects(varStartPos, '|', '}');
var initialExpr = text.Subsegment(varStartPos, varEndPos - varStartPos).Trim();
if (varEndPos == -1 || varEndPos >= text.Length)
{
throw new ArgumentException($"Invalid Server HTML Template at '{text.SubstringWithElipsis(0, 50)}'", nameof(text));
}
List <JsExpression> filterCommands = null;
var isFilter = text.GetChar(varEndPos) == '|';
if (isFilter)
{
bool foundVarEnd = false;
filterCommands = text.Subsegment(varEndPos + 1).ParseExpression <JsExpression>(
separator: '|',
atEndIndex: (str, strPos) =>
{
while (str.Length > strPos && str.GetChar(strPos).IsWhiteSpace())
{
strPos++;
}
if (str.Length > strPos + 1 && str.GetChar(strPos) == '}' && str.GetChar(strPos + 1) == '}')
{
foundVarEnd = true;
varEndPos = varEndPos + 1 + strPos + 1;
return(strPos);
}
return(null);
},
allowWhitespaceSensitiveSyntax: true);
if (!foundVarEnd)
{
throw new ArgumentException($"Invalid syntax near '{text.Subsegment(pos).SubstringWithElipsis(0, 50)}'");
}
}
else
{
varEndPos += 1;
}
lastPos = varEndPos + 1;
var originalText = text.Subsegment(pos, lastPos - pos);
to.Add(new PageVariableFragment(originalText, initialExpr, filterCommands));
}
if (lastPos != text.Length)
{
var lastBlock = lastPos == 0 ? text : text.Subsegment(lastPos);
to.Add(new PageStringFragment(lastBlock));
}
return(to);
}