private string StringifyConstant(SchemaConstant constant)
{
return($"{constant.Value}");
}
/// <summary>
/// Parse constant from <paramref name="startElementPosition"/> position in <paramref name="text"/>
/// string and return element's constant.
/// </summary>
/// <param name="text">String that will be parsed</param>
/// <param name="startElementPosition">Start position of element that has constant value</param>
/// <param name="elementName">Constant parent's name</param>
/// <param name="constant">Builded constant or null if constant doesn't exist</param>
/// <returns>Position after element close tag</returns>
/// <exception cref="ParseException">Throw if document has invalid structure</exception>
private int ParseConstant(string text, int startElementPosition, string elementName, out SchemaConstant constant)
{
constant = null;
var constantMatch = _constantRx.Match(text, startElementPosition);
if (!constantMatch.Success) // constant doesn't exist
{
return(startElementPosition);
}
var constantTextGroup = constantMatch.Groups[2];
// check open tag
var beforeOpenTagGroup = constantMatch.Groups[1];
var beforeOpenTagPosition = PositionAfterElement(beforeOpenTagGroup);
if (beforeOpenTagPosition != startElementPosition)
{
return(startElementPosition); // means that found another element's comment
}
var openTagNameMatch = _elementNameRx.Match(text, beforeOpenTagPosition);
if (!openTagNameMatch.Success)
{
throw new ParseException("Invalid or missing open tag", beforeOpenTagPosition);
}
var openTagName = openTagNameMatch.Groups[1].Value;
if (openTagName != elementName)
{
throw new ParseException("Name of open tag doesn't match with name of parent element", beforeOpenTagPosition);
}
// check close tag
var beforeCloseTagGroup = constantMatch.Groups[3];
var beforeCloseTagPosition = PositionAfterElement(beforeCloseTagGroup);
var closeTagMatch = _elementCloseTagRx.Match(text, beforeCloseTagPosition);
if (!closeTagMatch.Success)
{
throw new ParseException("Opened element should be closed", beforeCloseTagPosition);
}
var closeTagNameMatch = _elementNameRx.Match(text, beforeCloseTagPosition);
if (!closeTagNameMatch.Success)
{
throw new ParseException("Invalid or missing close tag", beforeCloseTagPosition);
}
var closeTagName = closeTagNameMatch.Groups[1].Value;
if (closeTagName != elementName)
{
throw new ParseException("Name of close tag doesn't match with name of parent element", beforeCloseTagPosition);
}
if (closeTagMatch.Index != beforeCloseTagPosition)
{
throw new ParseException("Element should be closed after constant", beforeCloseTagPosition);
}
var constantBuilder = BuilderFactory.Create();
constantBuilder.SetValue(constantTextGroup.Value);
constant = constantBuilder.BuildConstant();
return(PositionAfterElement(closeTagMatch));
}
