private StyleProp InsertProperty(StyleProp props, string name, string val)
{
StyleProp first, prev, prop;
int cmp;
prev = null;
first = props;
while (props != null)
{
cmp = props.Name.CompareTo(name);
if (cmp == 0)
{
/* this property is already defined, ignore new value */
return first;
}
else 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 name_end;
int value_end;
int value_start = 0;
int name_start = 0;
bool more;
name_start = 0;
while (name_start < style.Length)
{
while (name_start < style.Length && style[name_start] == ' ')
{
++name_start;
}
name_end = name_start;
while (name_end < style.Length)
{
if (style[name_end] == ':')
{
value_start = name_end + 1;
break;
}
++name_end;
}
if (name_end >= style.Length || style[name_end] != ':')
{
break;
}
while (value_start < style.Length && style[value_start] == ' ')
{
++value_start;
}
value_end = value_start;
more = false;
while (value_end < style.Length)
{
if (style[value_end] == ';')
{
more = true;
break;
}
++value_end;
}
prop = InsertProperty(prop, style.Substring(name_start, (name_end) - (name_start)), style.Substring(value_start, (value_end) - (value_start)));
if (more)
{
name_start = value_end + 1;
continue;
}
break;
}
return prop;
}
private string CreatePropString(StyleProp props)
{
string style = "";
int len;
StyleProp prop;
/* compute length */
for (len = 0, prop = props; prop != null; prop = prop.Next)
{
len += prop.Name.Length + 2;
len += prop.Val.Length + 2;
}
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;
}
public StyleProp(string name, string val, StyleProp next)
{
_name = name;
_val = val;
_next = next;
}
public StyleProp(string name, string val, StyleProp next)
{
_name = name;
_val = val;
_next = next;
}