/// <summary>
/// Looks for the location of the next tag, starting at the specified position
/// </summary>
/// <returns>The position details of the next tag</returns>
/// <param name="searchText">The text to search for tags</param>
/// <param name="startPosition">The position within the text to start search for tags</param>
/// <param name="tagName">The name of the tag to search for</param>
private TagPosition FindTagPosition(string searchText, int startPosition, string tagName)
{
TagPosition tagPosition = null;
string startTagText = "<!-- " + tagName + " ";
int tagStartStartIndex = searchText.IndexOf(startTagText, startPosition, StringComparison.OrdinalIgnoreCase);
if (tagStartStartIndex == -1)
{
return(null); // tag not found
}
string startTagEndText = " -->";
int tagStartEndIndex = searchText.IndexOf(startTagEndText, tagStartStartIndex, StringComparison.OrdinalIgnoreCase);
if (tagStartEndIndex == -1)
{
this.BuildHandler.SignalBuildError(tagName + " tag not closed");
}
tagPosition = new TagPosition();
tagPosition.StartPosition = tagStartStartIndex;
tagPosition.StartEndPosition = tagStartStartIndex + startTagText.Length;
tagPosition.EndPosition = tagStartEndIndex + startTagEndText.Length;
return(tagPosition);
}
/// <summary>
/// Attempts to extract the the next tag, starting at the specified position
/// </summary>
/// <returns>True if a Tag was found</returns>
/// <param name="tag">The Tag to find</param>
/// <param name="currentPosition">The position to start looking at</param>
private void ExtractTag(Tag tag, int currentPosition)
{
// Find the tag
TagPosition startTagPosition = this.FindTagPosition(tag.SearchText, currentPosition, tag.Name + (tag.HasContent ? "_START" : ""));
if (startTagPosition == null)
{
return; // Tag not found
}
tag.StartTagPosition = startTagPosition;
// Extract the Tag values
this.GetTagValues(tag);
}
/// <summary>
/// Locate the end tag and extract everything inbetween the start and end tags
/// </summary>
/// <param name="tag">The target tag</param>
private void ExtractTagContent(Tag tag)
{
// Find the end tag
string endTagName = tag.Name + "_END";
TagPosition endTagPosition = this.FindTagPosition(tag.SearchText, tag.StartTagPosition.EndPosition, endTagName);
if (endTagPosition == null)
{
this.BuildHandler.SignalBuildError("Missing end tag");
}
tag.EndTagPosition = endTagPosition;
// Get all the text inbetween the start and end tags - that's the content
int contentLength = tag.EndTagPosition.StartPosition - tag.StartTagPosition.EndPosition;
tag.Contents = tag.SearchText.Substring(tag.StartTagPosition.EndPosition, contentLength);
}