/// <summary>
/// Returns the next fragment found in the current unconsumed block of text
/// </summary>
/// <returns></returns>
internal bool Consume()
{
if (string.IsNullOrEmpty(_unconsumedTemplateText)) return false;
string fragmentText = string.Empty;
var openMatch = Regex.Match(_unconsumedTemplateText, "{{2,3}"); // regex that looks for either 2 or 3 {'s
var closeMatch = Regex.Match(_unconsumedTemplateText, "}{2,3}"); // regex that looks for either 2 or 3 }'s
if (openMatch.Success && closeMatch.Success)
{
// remaining text contains a placeholder
// extract the placeholder text including braces
fragmentText = _unconsumedTemplateText.Substring(openMatch.Index, (closeMatch.Index + closeMatch.Value.Length) - (openMatch.Index)).Trim();
int fragmentIndex = _unconsumedTemplateText.IndexOf(fragmentText);
string preText = _unconsumedTemplateText.Substring(0, fragmentIndex);
string postText = _unconsumedTemplateText.Substring(fragmentIndex + fragmentText.Length);
if (!string.IsNullOrEmpty(preText))
{
// there is plain text before the placeholder, process that first
_unconsumedTemplateText = fragmentText + postText;
NextFragment = new TemplateFragment(preText);
}
else
{
_unconsumedTemplateText = postText;
NextFragment = new TemplateFragment(fragmentText);
}
}
else
{
// remaining text is plain text
var placeholder = new TemplateFragment(_unconsumedTemplateText);
_unconsumedTemplateText = string.Empty; // finish processing
NextFragment = placeholder;
}
return true;
}
public IRule Match(TemplateFragment p)
{
try
{
foreach (var rule in Rules)
{
if (rule.RuleApplies(p)) return rule;
}
}
catch (Exception ex)
{
throw new Exception("A malformed template fragment was detected: " + p.String, ex);
}
throw new Exception("A rule was not found that matches text:" + p.String);
}