/// <summary>
/// Parses tag code into attributes
/// </summary>
private static List <HTMLAttribute> ParseAttributes(string tagCode)
{
List <HTMLAttribute> attributesList = new List <HTMLAttribute>();
List <int> spaceIndexes = Utils.GetIndexes(tagCode, " "); // Get indexes of all spaces
foreach (int spaceIndex in spaceIndexes)
{
int index = spaceIndex + 1;
char nextSign = tagCode[index];
// Loop is used for parsing attributes next to each other
// For example
// message="example"user="******"readonly
while (true)
{
// Check if there is attribute not separated with space
if (nextSign != ' ' && nextSign != '>')
{
HTMLAttribute attribute = ParseAttribute(tagCode, index);
// Check if during attribute parsing, occurred an error
if (attribute == null)
{
return(new List <HTMLAttribute>());
}
attributesList.Add(attribute);
if (attribute.HasValue)
{
index = attribute.ValueEndIndex + 1;
}
else
{
break;
}
}
else
{
break;
}
}
}
// Parsed attributes usually aren't correct, so incorrect attributes must be removed
return(FixHTMLAttributes(attributesList));
}
/// <summary>
/// Fixes attributes list
/// </summary>
private static List <HTMLAttribute> FixHTMLAttributes(List <HTMLAttribute> list)
{
List <HTMLAttribute> fixedList = new List <HTMLAttribute>();
// Add first attribute
if (list.Count > 0)
{
fixedList.Add(list[0]);
}
HTMLAttribute lastAttributeWithValue = new HTMLAttribute();
for (int i = 0; i < list.Count; i++)
{
HTMLAttribute attribute = list[i];
if (i > 0 && lastAttributeWithValue.PropertyStartIndex != 1 && attribute.Property.Length > 0)
{
// If parsed attribute's start index is less than end index of value of latest attribute containing value is incorrect
// For example
// Actual start index = 18
// End index of value of latest attribute = 21
// 18 < 21 so it's incorrect
if (attribute.PropertyStartIndex > lastAttributeWithValue.ValueEndIndex)
{
fixedList.Add(attribute);
}
}
if (attribute.HasValue)
{
lastAttributeWithValue = attribute;
}
}
return(fixedList);
}
/// <summary>
/// Parses html tag code into attribute
/// </summary>
private static HTMLAttribute ParseAttribute(string code, int startIndex)
{
HTMLAttribute attribute = new HTMLAttribute();
attribute.PropertyStartIndex = startIndex;
// Check if attribute contains value and get property end index
for (int i = startIndex; i < code.Length; i++)
{
char sign = code[i];
// Attribute has value
if (sign == '=')
{
attribute.PropertyEndIndex = i;
attribute.HasValue = true;
break;
}
else if (sign == ' ' || sign == '>') // Attribute hasn't value
{
attribute.PropertyEndIndex = i;
break;
}
}
// Get property
attribute.Property = code.Substring(attribute.PropertyStartIndex, attribute.PropertyEndIndex - attribute.PropertyStartIndex).ToLower();
// Gets value
if (attribute.HasValue)
{
char sign = code[attribute.PropertyEndIndex + 1];
// If value doesn't starts with quotation mark
if (sign != '"')
{
attribute.ValueStartIndex = attribute.PropertyEndIndex + 1;
// Gets index closing value
for (int i = attribute.PropertyEndIndex + 1; i < code.Length; i++)
{
char _sign = code[i];
if (_sign == '"' || _sign == '>' || _sign == ' ')
{
attribute.ValueEndIndex = i;
break;
}
}
}
else // If value starts with quotation mark
{
attribute.ValueStartIndex = attribute.PropertyEndIndex + 2;
// Get quotation mark closing value
attribute.ValueEndIndex = ParseAttributesGetQuotationMarkIndex(code, attribute.ValueStartIndex);
}
// Get value
try {
attribute.Value = code.Substring(attribute.ValueStartIndex, attribute.ValueEndIndex - attribute.ValueStartIndex).ToLower();
} catch {
Console.WriteLine("Attribute is incorrect (" + attribute.Property + ")");
return(null);
}
}
return(attribute);
}
