private StyleProp InsertProperty(StyleProp props, string name, string val)
{
StyleProp prop;
StyleProp prev = null;
StyleProp first = props;
while (props != null)
{
int cmp = String.Compare(props.Name, name, StringComparison.Ordinal);
if (cmp == 0)
{
/* this property is already defined, ignore new value */
return first;
}
if (cmp > 0)
{
// props.name > name
/* insert before this */
prop = new StyleProp(name, val, props);
if (prev != null)
{
prev.Next = prop;
}
else
{
first = prop;
}
return first;
}
prev = props;
props = props.Next;
}
prop = new StyleProp(name, val);
if (prev != null)
{
prev.Next = prop;
}
else
{
first = prop;
}
return first;
}
/*
Create sorted linked list of properties from style string
It temporarily places nulls in place of ':' and ';' to
delimit the strings for the property name and value.
Some systems don't allow you to null literal strings,
so to avoid this, a copy is made first.
*/
private StyleProp CreateProps(StyleProp prop, string style)
{
int valueStart = 0;
int nameStart;
nameStart = 0;
while (nameStart < style.Length)
{
while (nameStart < style.Length && style[nameStart] == ' ')
{
++nameStart;
}
int nameEnd = nameStart;
while (nameEnd < style.Length)
{
if (style[nameEnd] == ':')
{
valueStart = nameEnd + 1;
break;
}
++nameEnd;
}
if (nameEnd >= style.Length || style[nameEnd] != ':')
{
break;
}
while (valueStart < style.Length && style[valueStart] == ' ')
{
++valueStart;
}
int valueEnd = valueStart;
bool more = false;
while (valueEnd < style.Length)
{
if (style[valueEnd] == ';')
{
more = true;
break;
}
++valueEnd;
}
prop = InsertProperty(prop, style.Substring(nameStart, (nameEnd) - (nameStart)),
style.Substring(valueStart, (valueEnd) - (valueStart)));
if (more)
{
nameStart = valueEnd + 1;
continue;
}
break;
}
return prop;
}
private string CreatePropString(StyleProp props)
{
string style = "";
StyleProp prop;
/* compute length */
for (prop = props; prop != null; prop = prop.Next)
{
}
for (prop = props; prop != null; prop = prop.Next)
{
style = string.Concat(style, prop.Name);
style = string.Concat(style, ": ");
style = string.Concat(style, prop.Val);
if (prop.Next == null)
{
break;
}
style = string.Concat(style, "; ");
}
return style;
}