/// <summary>
/// keyword: [-a-zA-Z]+ !ns;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Keyword(LessPegNode node)
{
return new Keyword(node.GetAsString(Src));
}
/// <summary>
/// TODO: Added quick fix for multipule mixins, but need to add mixins with variables which will changes things a bit
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
// private void OldMixin(LessPegNode node, Element element)
// {
// var root = element.GetRoot();
// foreach (var el in Selectors(node.Child, els => els))
// root = root.Descend(el.Selector, el);
// if (root.Children != null) element.Children.AddRange(root.Children);
// }
private void Mixin(LessPegNode node, ElementBlock elementBlock)
{
var root = elementBlock.GetRoot();
var rules = new List<INode>();
foreach (var mixins in node.Children())
{
var selectors = Selectors(mixins, els => els).ToList();
if (selectors.Count() > 1)
{
foreach (var el in selectors)
root = root.Descend(el.Selector, el);
var last = selectors.Last();
var children = GetMixinChildren(elementBlock, last, root);
if(children != null)
rules.AddRange(children);
}
else
{
var el = selectors.First();
foreach (var mixinElement in root.Nearests(el.Name))
{
var children = GetMixinChildren(elementBlock, el, mixinElement);
if(children != null)
rules.AddRange(children);
}
}
}
elementBlock.Children.AddRange(rules);
}
/// <summary>
/// space_delimited_expressions: expression (WS expression)* important? ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private IEnumerable<INode> SpaceDelimitedExpressions(LessPegNode node, ElementBlock elementBlock)
{
yield return Expression(node.Child, elementBlock);
node = node.Next;
//Tail
while (node != null)
{
switch (node.Type())
{
case EnLess.expression:
yield return Expression(node.Child, elementBlock);
break;
case EnLess.important:
yield return new Keyword("!important");
break;
}
node = node.Next;
}
}
/// <summary>
/// arguments : '(' s argument s (',' s argument s)* ')';
/// argument : color / number unit / string / [a-zA-Z]+ '=' dimension / function / expressions / [-a-zA-Z0-9_%$/.&=:;#+?]+ / keyword (S keyword)*;
/// </summary>
/// <param name="node"></param>
/// <param name="element"></param>
/// <returns></returns>
private IEnumerable<INode> Arguments(LessPegNode node, ElementBlock element)
{
foreach (var argument in node.Children())
{
if (argument.Child == null)
yield return new Anonymous(argument.GetAsString(Src));
else
{
switch (argument.Child.Type())
{
case EnLess.color:
yield return Color(argument.Child);
break;
case EnLess.number:
yield return Number(argument.Child);
break;
case EnLess.function:
yield return Function(argument.Child, element);
break;
case EnLess.expressions:
yield return Expression(argument.Child, element);
break;
case EnLess.@string:
yield return new String(argument.GetAsString(Src));
break;
case EnLess.keyword:
yield return new Keyword(argument.GetAsString(Src));
break;
default:
yield return new Anonymous(argument.GetAsString(Src));
break;
}
}
}
}
/// <summary>
/// rgb:(rgb_node)(rgb_node)(rgb_node) / hex hex hex ;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode RGB(LessPegNode node)
{
int r = 0, g = 0, b = 0;
string tmp;
var rgbNode = node.Child; //Fisrt node;
if (rgbNode != null)
{
tmp = rgbNode.GetAsString(Src);
r = int.Parse(tmp.Length==1 ? tmp+tmp : tmp, NumberStyles.HexNumber);
rgbNode = rgbNode.Next;
if (rgbNode != null)
{
tmp = rgbNode.GetAsString(Src);
g = int.Parse(tmp.Length == 1 ? tmp + tmp : tmp, NumberStyles.HexNumber);
rgbNode = rgbNode.Next;
if (rgbNode != null)
{
tmp = rgbNode.GetAsString(Src);
b = int.Parse(tmp.Length == 1 ? tmp + tmp : tmp, NumberStyles.HexNumber);
}
}
}
return new Color(r, g, b);
}
/// <summary>
/// selector : (s select element s)+ arguments? ;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private IEnumerable<ElementBlock> Selector(LessPegNode node)
{
var enumerator = node.Children().GetEnumerator();
while(enumerator.MoveNext())
{
ElementBlock block;
var selector = enumerator.Current.GetAsString(Src).Trim();
enumerator.MoveNext();
var name = enumerator.Current.GetAsString(Src);
var next = enumerator.Current.Next;
var isMixinWithArgs = next != null && next.Type() == EnLess.arguments;
if (isMixinWithArgs)
{
var mixinBlock = new MixinBlock(name, selector);
block = mixinBlock;
var arguments = GetMixinArguments(next, block);
enumerator.MoveNext();
foreach (var argument in arguments)
mixinBlock.Arguments.Add(argument);
}
else
block = new ElementBlock(name, selector);
yield return block;
}
}
/// <summary>
/// expressions: operation_expressions / space_delimited_expressions / [-a-zA-Z0-9_%*/.&=:,#+? \[\]()]+ ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private IEnumerable<INode> Expressions(LessPegNode node, ElementBlock elementBlock)
{
// Expression
switch (node.Type())
{
case EnLess.operation_expressions:
return OperationExpressions(node.Child, elementBlock).ToList();
case EnLess.space_delimited_expressions:
return SpaceDelimitedExpressions(node.Child, elementBlock).ToList();
default:
if (node.Child == null) //CatchAll
return new List<INode>
{
new Anonymous(node.GetAsString(Src))
};
return Expressions(node.Child, elementBlock);
}
}
private ElementBlock Primary(LessPegNode node)
{
var element = new ElementBlock("");
return Primary(node, element);
}
/// <summary>
/// entity : function / fonts / accessor / keyword / variable / literal ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private INode Entity(LessPegNode node, ElementBlock elementBlock)
{
switch (node.Type())
{
case EnLess.literal:
return Entity(node.Child, elementBlock);
case EnLess.number:
return Number(node);
case EnLess.color:
return Color(node);
case EnLess.variable:
return Variable(node);
case EnLess.accessor:
return Accessor(node.Child, elementBlock);
case EnLess.fonts:
return Fonts(node);
case EnLess.keyword:
return Keyword(node);
case EnLess.function:
return Function(node, elementBlock);
case EnLess.cursors:
return Cursors(node);
case EnLess.@string:
return new String(node.GetAsString(Src));
default:
return new Anonymous(node.GetAsString(Src));
}
}
/// <summary>
/// expression: '(' s expressions s ')' / entity ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private INode Expression(LessPegNode node, ElementBlock elementBlock)
{
switch (node.Type())
{
case EnLess.expressions:
return new Expression(Expressions(node, elementBlock), elementBlock);
case EnLess.entity:
var entity = Entity(node.Child, elementBlock);
entity.Parent = elementBlock;
return entity;
default:
throw new ParsingException("Expression should either be child expressions or an entity");
}
}
/// <summary>
/// declaration: standard_declaration / catchall_declaration ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
private void Declaration(LessPegNode node, ElementBlock elementBlock)
{
var name = node.GetAsString(Src).Replace(" ", "");
var nextNode = node.Next;
if(nextNode == null){
// TODO: emit warning: empty declaration //
return;
}
if (nextNode.Type() == EnLess.comment)
nextNode = nextNode.Next;
var values = Expressions(nextNode, elementBlock);
var property = name.StartsWith("@") ? new Variable(name, values) : new Property(name, values);
elementBlock.Add(property);
}
/// <summary>
/// cursor (s ',' s cursor)+ ;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Cursors(LessPegNode node)
{
var set = from childNode in node.Children()
select (childNode.Child ?? childNode).GetAsString(Src);
return new CursorSet(set.ToArray());
}
/// <summary>
/// color: '#' rgb;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Color(LessPegNode node)
{
return RGB(node.Child);
}
/// <summary>
/// number: '-'? [0-9]* '.' [0-9]+ / '-'? [0-9]+;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Number(LessPegNode node)
{
var val = float.Parse(node.GetAsString(Src), NumberFormatInfo.InvariantInfo);
var unit = "";
node = node.Next;
if (node != null && node.Type() == EnLess.unit) unit = node.GetAsString(Src);
return new Number(unit, val);
}
/// <summary>
/// fonts : font (s ',' s font)+ ;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Fonts(LessPegNode node)
{
var fonts = from childNode in node.Children()
select (childNode.Child ?? childNode).GetAsString(Src);
return new FontFamily(fonts.ToArray());
}
/// <summary>
/// operation_expressions: expression (operator expression)+;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private IEnumerable<INode> OperationExpressions(LessPegNode node, ElementBlock elementBlock)
{
yield return Expression(node.Child, elementBlock);
node = node.Next;
//Tail
while (node != null)
{
switch (node.Type())
{
case EnLess.@operator:
yield return new Operator(node.GetAsString(Src), elementBlock);
break;
case EnLess.expression:
yield return Expression(node.Child, elementBlock);
break;
case EnLess.comment:
node.ToString();
break;
}
node = node.Next;
}
}
/// <summary>
/// function: function_name arguments ;
/// </summary>
/// <param name="node"></param>
/// <param name="element"></param>
/// <returns></returns>
private INode Function(LessPegNode node, ElementBlock element)
{
var funcName = node.Child.GetAsString(Src);
var arguments = Arguments(node.Child.Next, element);
return new Function(funcName, arguments.ToList());
}
/// <summary>
/// primary: (import / declaration / ruleset / comment)* ;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
private ElementBlock Primary(LessPegNode node, ElementBlock elementBlock)
{
foreach (var nextPrimary in node.Children())
{
switch (nextPrimary.Type())
{
case EnLess.import:
Import(nextPrimary.Child, elementBlock);
//element.Children.AddRange(import);
break;
case EnLess.insert:
Insert(nextPrimary.Child, elementBlock);
//element.Children.AddRange(import);
break;
case EnLess.standard_ruleset:
RuleSet(nextPrimary, elementBlock);
break;
case EnLess.mixin_ruleset:
Mixin(nextPrimary,elementBlock);
break;
case EnLess.declaration:
Declaration(nextPrimary.Child, elementBlock);
break;
}
}
return elementBlock;
}
private IEnumerable<Variable> GetMixinArguments(LessPegNode arguments, ElementBlock block)
{
var enumerator = arguments.Children().GetEnumerator();
var variables = new List<Variable>();
var position = 0;
while (enumerator.MoveNext())
{
var node = enumerator.Current;
string name;
IEnumerable<INode> value;
if (node.Child.Type() == EnLess.variable) // expect "@variable: expression"
{
name = node.Child.GetAsString(Src);
value = Expressions(node.Child.Next, block);
}
else // expect "expresion"
{
// HACK: to make Arguments return as expected.
var tmpNode = new LessPegNode(null, (int) EnLess.arguments, Root);
tmpNode.Child = new LessPegNode(tmpNode, (int)EnLess.argument, Root);
tmpNode.Child.Child = node.Child;
name = position.ToString();
value = Arguments(tmpNode, block).ToList();
}
variables.Add(new Variable(name, value));
if(node.Next == null || node.Next.Type() != EnLess.argument)
break;
position++;
}
return variables;
}
/// <summary>
/// ruleset: selectors [{] ws prsimary ws [}] ws / ws selectors ';' ws;
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
private void RuleSet(LessPegNode node, ElementBlock elementBlock)
{
foreach (var el in Selectors(node.Child, els => StandardSelectors(elementBlock, els)))
Primary(node.Child.Next, el);
}
/// <summary>
/// import : ws '@import' S import_url medias? s ';' ;
/// </summary>
/// <param name="node"></param>
private IEnumerable<INode> Import(LessPegNode node, ElementBlock elementBlock)
{
node = (node.Child ?? node);
//
// var path = "";
// if(node.ToEnLess()==EnLess.expressions)
// {
// var values = Expressions(node, element);
// var fakeVariableName = new Variable(string.Format("@{0}", DateTime.Now.Ticks), values);
// element.Add(fakeVariableName);
// path = fakeVariableName.ToCss();
// }
// else
// {
// path = (node).GetAsString(Src)
// .Replace("\"", "").Replace("'", "");
// }
var path = (node).GetAsString(Src)
.Replace("\"", "").Replace("'", "");
if(HttpContext.Current!=null){
path = HttpContext.Current.Server.MapPath(path);
}
if(File.Exists(path))
{
var engine = new ExtensibleEngineImpl(File.ReadAllText(path), elementBlock);
return engine.LessDom.Children;
}
return new List<INode>();
}
/// <summary>
/// selectors : ws selector (s ',' ws selector)* ws ;
/// </summary>
/// <param name="node"></param>
/// <param name="action"></param>
/// <returns></returns>
private IEnumerable<ElementBlock> Selectors(LessPegNode node, Func<IEnumerable<ElementBlock>, IEnumerable<ElementBlock>> action)
{
foreach(var selector in node.Children(x => x.Type() == EnLess.selector))
{
var selectors = Selector(selector);
foreach(var s in action(selectors)) yield return s;
}
}
private IEnumerable<INode> Insert(LessPegNode node, ElementBlock elementBlock)
{
node = (node.Child ?? node);
var path = (node).GetAsString(Src)
.Replace("\"", "").Replace("'", "");
if (HttpContext.Current != null){
path = HttpContext.Current.Server.MapPath(path);
}
if (File.Exists(path)){
var text = File.ReadAllText(path);
elementBlock.Add(new Insert(text));
}
return new List<INode>();
}
/// <summary>
/// variable: '@' [-_a-zA-Z0-9]+;
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
private INode Variable(LessPegNode node)
{
return new Variable(node.GetAsString(Src));
}
/// <summary>
/// accessor: accessor_name '[' accessor_key ']';
/// </summary>
/// <param name="node"></param>
/// <param name="elementBlock"></param>
/// <returns></returns>
private INode Accessor(LessPegNode node, ElementBlock elementBlock)
{
var ident = node.GetAsString(Src);
var key = node.Next.GetAsString(Src).Replace("'", "");
var el = elementBlock.NearestAs<ElementBlock>(ident);
if (el != null)
{
var prop = el.GetAs<Property>(key);
if (prop != null) return prop.Value;
}
return new Anonymous("");
}