public override HtmlXPathTemplate Read()
{
HtmlXPathTemplate template = new HtmlXPathTemplate();
string[] lines =
new SplitText(
RawTemplate,
StringSplitOptions.RemoveEmptyEntries,
Options.LineEnding);
template.RootNodeXPath = lines[0];
List <HtmlXPathTemplatePattern> list = new List <HtmlXPathTemplatePattern>();
HtmlXPathTemplatePattern lastPattern = null;
for (int i = 1; i < lines.Length; i++)
{
string line = lines[i];
HtmlXPathTemplatePattern pattern = new HtmlXPathTemplatePattern();
{
pattern.Level = line
.SplitByLength(Options.Tabulator.Length)
.TakeWhile(x => x == Options.Tabulator)
.Count();
}
{
Regex innerTextRegex = new Regex(@"\/\$(?<innerText>\w+)$");
Match innerTextMatch = innerTextRegex.Match(line);
if (innerTextMatch.Success)
{
pattern.InnerTextVariable = innerTextMatch.Groups["innerText"].Value;
line = line.Substring(0, line.Length - pattern.InnerTextVariable.Length - 2);
}
}
{
Regex attributeRegex = new Regex(@"@(?<from>[^=]+)=\$(?<to>\w+)");
MatchCollection attributeMatches = attributeRegex.Matches(line);
foreach (Match attributeMatch in attributeMatches)
{
if (attributeMatch.Success)
{
pattern.AddAttributeVariable(
attributeMatch.Groups["from"].Value,
attributeMatch.Groups["to"].Value);
line = attributeRegex.Replace(line, m => $"@{m.Groups["from"].Value}", 1);
}
}
}
{
pattern.XPathSelector = line.Substring(Options.Tabulator.Length * pattern.Level);
}
if (pattern.Level == 1)
{
list.Add(pattern);
}
else
{
bool found = false;
HtmlXPathTemplatePattern potentialParent = lastPattern;
while (potentialParent != null)
{
if (potentialParent.Level == pattern.Level - 1)
{
found = true;
pattern.Parent = potentialParent;
potentialParent.AddChild(pattern);
break;
}
potentialParent = potentialParent.Parent;
}
if (!found)
{
throw new InvalidDataException(
$"Parent could not be found for the pattern with index={i}. Expected parent level is {pattern.Level - 1}. XPathSelector={pattern.XPathSelector}");
}
}
lastPattern = pattern;
}
template.Patterns = list.ToArray();
return(template);
}
public void AddChild(HtmlXPathTemplatePattern pattern) => _children.Add(pattern);