/// <summary>Reads the properties for this style block from the lexer.
/// Essentially treats it like a set of properties only. Terminated by }, null or >.</summary>
public void LoadProperties(CssLexer lexer, OnReadProperty onPropertyRead)
{
// Read the properties inside a selectors block.
lexer.SkipJunk();
char current = lexer.Peek();
bool readPropertyName = true;
bool isVariable = false;
int dashCount = 0;
StringBuilder propertyName = new StringBuilder();
while (current != '\0' && current != '<' && current != '}')
{
// Read the property name:
if (readPropertyName)
{
// Hash, open quote or {? If so, the value does not start with a colon.
CssUnitHandlers set;
if (CssUnits.AllStart.TryGetValue(current, out set))
{
// Match on the pretext:
Value value = set.Handle(lexer, false);
if (value != null)
{
// Read the value (using the global instance):
value = value.ReadStartValue(lexer);
// Call ready:
value.OnValueReady(lexer);
// Get the property name:
string pName = propertyName.ToString().ToLower().Trim();
propertyName.Length = 0;
// Trigger OPR (note that it's triggered all the time):
int status = 0;
if (onPropertyRead != null)
{
status = onPropertyRead(this, pName, value);
}
if (status == 0)
{
// Map property to a function:
CssProperty property = CssProperties.Get(pName);
if (property != null)
{
// Apply, taking aliases into account:
property.OnReadValue(this, value);
}
}
// Read off any junk:
lexer.SkipJunk();
// Update current:
current = lexer.Peek();
continue;
}
}
if (current == ':')
{
// Done reading the property:
readPropertyName = false;
dashCount = 0;
// Note that we don't need to skip junk as ReadValue will internally anyway.
}
else if (current == '-' && propertyName.Length == 0)
{
dashCount++;
if (dashCount == 2)
{
isVariable = true;
propertyName.Length = 0;
}
else
{
propertyName.Append(current);
}
}
else
{
propertyName.Append(current);
}
// Read it off:
lexer.Read();
// And take a look at what's next:
current = lexer.Peek();
}
else
{
// Read the value:
Value value = lexer.ReadValue();
string pName = propertyName.ToString().ToLower().Trim();
propertyName.Length = 0;
if (isVariable)
{
// CSS variable.
isVariable = false;
// Add to lexer set:
lexer.AddVariable(pName, value);
}
else
{
// Trigger OPR (note that it's triggered all the time):
int status = 0;
if (onPropertyRead != null)
{
status = onPropertyRead(this, pName, value);
}
if (status == 0)
{
// Map property to a function:
CssProperty property = CssProperties.Get(pName);
if (property != null)
{
// Apply, taking aliases into account:
property.OnReadValue(this, value);
}
}
}
// ReadValue might actually read off the } in malformed CSS.
// Make sure it didn't just do that:
if (lexer.Input[lexer.Position - 1] == '}')
{
lexer.Position--;
}
// Read off any junk:
lexer.SkipJunk();
// Update current:
current = lexer.Peek();
// Go into property reading mode:
readPropertyName = true;
}
}
}
/// <summary>Attempts to handle the given lexer with this units set.</summary>
public Css.Value Handle(CssLexer lexer, bool removeAll)
{
// By peeking, get as far as we can until a delim of any kind is reached, or we can't go any further.
// e.g. 41px*50% - the first will terminate successfully at the x.
// Note that we know the current peek matches character.
CssUnitHandlers handler = this;
int currentIndex = 1;
while (true)
{
// Get the char:
char letter = lexer.Peek(currentIndex);
currentIndex++;
// Got a handler for it?
if (handler.Handlers == null)
{
// Nope! handler.Value, if there is one, is the furthest we can go.
break;
}
int handlerSetCount = handler.Handlers.Count;
// Linear scan is faster than a hashtable here.
for (int i = 0; i < handlerSetCount; i++)
{
if (handler.Handlers[i].Character == letter)
{
// Got it! Keep going.
handler = handler.Handlers[i];
goto NextLetter;
}
}
// No letter matches. Stop there.
break;
NextLetter:
continue;
}
if (handler.Value != null)
{
// Read off the amount we read now.
int start = 2;
if (removeAll)
{
start = 1;
}
for (int i = start; i < currentIndex; i++)
{
lexer.Read();
}
}
return(handler.Value);
}
