public static StyleSheet FromResource(string resourcePath, Assembly assembly, IXmlLineInfo lineInfo = null)
{
var styleSheet = new StyleSheet();
var resString = DependencyService.Get <IResourcesLoader>().GetResource(resourcePath, assembly, styleSheet, lineInfo);
using (var textReader = new StringReader(resString))
using (var cssReader = new CssReader(textReader))
Parse(styleSheet, cssReader);
return(styleSheet);
}
public static Style Parse(CssReader reader, char stopChar = '\0')
{
Style style = new Style();
string propertyName = null, propertyValue = null;
int p;
reader.SkipWhiteSpaces();
bool readingName = true;
while ((p = reader.Peek()) > 0)
{
switch (unchecked ((char)p))
{
case ':':
reader.Read();
readingName = false;
reader.SkipWhiteSpaces();
break;
case ';':
reader.Read();
if (!string.IsNullOrEmpty(propertyName) && !string.IsNullOrEmpty(propertyValue))
{
style.Declarations.Add(propertyName, propertyValue);
}
propertyName = propertyValue = null;
readingName = true;
reader.SkipWhiteSpaces();
break;
default:
if ((char)p == stopChar)
{
return(style);
}
if (readingName)
{
propertyName = reader.ReadIdent();
if (propertyName == null)
{
throw new Exception();
}
}
else
{
propertyValue = reader.ReadUntil(stopChar, ';', ':');
}
break;
}
}
return(style);
}
/// <include file="../../../docs/Microsoft.Maui.Controls.StyleSheets/StyleSheet.xml" path="//Member[@MemberName='FromReader']/Docs" />
public static StyleSheet FromReader(TextReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
var sheet = new StyleSheet();
using (var cssReader = new CssReader(reader))
Parse(sheet, cssReader);
return(sheet);
}
static void Parse(StyleSheet sheet, CssReader reader)
{
Style style = null;
var selector = Selector.All;
int p;
bool inStyle = false;
reader.SkipWhiteSpaces();
while ((p = reader.Peek()) > 0)
{
switch ((char)p)
{
case '@':
throw new NotSupportedException("AT-rules not supported");
case '{':
reader.Read();
style = Style.Parse(reader, '}');
inStyle = true;
break;
case '}':
reader.Read();
if (!inStyle)
{
throw new Exception();
}
inStyle = false;
sheet.Styles.Add(selector, style);
style = null;
selector = Selector.All;
break;
default:
selector = Selector.Parse(reader, '{');
break;
}
}
}
public static Selector Parse(CssReader reader, char stopChar = '\0')
{
Selector root = All, workingRoot = All;
Operator workingRootParent = null;
Action <Operator, Selector> setCurrentSelector = (op, sel) => SetCurrentSelector(ref root, ref workingRoot, ref workingRootParent, op, sel);
int p;
reader.SkipWhiteSpaces();
while ((p = reader.Peek()) > 0)
{
switch (unchecked ((char)p))
{
case '*':
setCurrentSelector(new And(), All);
reader.Read();
break;
case '.':
reader.Read();
var className = reader.ReadIdent();
if (className == null)
{
return(Invalid);
}
setCurrentSelector(new And(), new Class(className));
break;
case '#':
reader.Read();
var id = reader.ReadName();
if (id == null)
{
return(Invalid);
}
setCurrentSelector(new And(), new Id(id));
break;
case '[':
throw new NotImplementedException("Attributes not implemented");
case ',':
reader.Read();
setCurrentSelector(new Or(), All);
reader.SkipWhiteSpaces();
break;
case '+':
reader.Read();
setCurrentSelector(new Adjacent(), All);
reader.SkipWhiteSpaces();
break;
case '~':
reader.Read();
setCurrentSelector(new Sibling(), All);
reader.SkipWhiteSpaces();
break;
case '>':
reader.Read();
setCurrentSelector(new Child(), All);
reader.SkipWhiteSpaces();
break;
case '^': //not in CSS spec
reader.Read();
var element = reader.ReadIdent();
if (element == null)
{
return(Invalid);
}
setCurrentSelector(new And(), new Base(element));
break;
case ' ':
case '\t':
case '\n':
case '\r':
case '\f':
reader.Read();
bool processWs = false;
while ((p = reader.Peek()) > 0)
{
var c = unchecked ((char)p);
if (char.IsWhiteSpace(c))
{
reader.Read();
continue;
}
processWs = (c != '+' &&
c != '>' &&
c != ',' &&
c != '~' &&
c != stopChar);
break;
}
if (!processWs)
{
break;
}
setCurrentSelector(new Descendent(), All);
reader.SkipWhiteSpaces();
break;
default:
if (unchecked ((char)p) == stopChar)
{
return(root);
}
var elementName = reader.ReadIdent();
if (elementName == null)
{
return(Invalid);
}
setCurrentSelector(new And(), new Element(elementName));
break;
}
}
return(root);
}