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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#ifndef ROCKETCORESTYLESHEETNODE_H
#define ROCKETCORESTYLESHEETNODE_H
#include "../../Include/Rocket/Core/PropertyDictionary.h"
#include "../../Include/Rocket/Core/StyleSheet.h"
#include "../../Include/Rocket/Core/Types.h"
namespace Rocket {
namespace Core {
class StyleSheetNodeSelector;
typedef std::map< StringList, PropertyDictionary > PseudoClassPropertyMap;
/**
A style sheet is composed of a tree of nodes.
@author Pete / Lloyd
*/
class StyleSheetNode
{
public:
enum NodeType
{
TAG = 0,
CLASS,
ID,
PSEUDO_CLASS,
STRUCTURAL_PSEUDO_CLASS,
NUM_NODE_TYPES, // only counts the listed node types
ROOT // special node type we don't keep in a list
};
/// Constructs a generic style-sheet node.
StyleSheetNode(const String& name, NodeType type, StyleSheetNode* parent = NULL);
/// Constructs a structural style-sheet node.
StyleSheetNode(const String& name, StyleSheetNode* parent, StyleSheetNodeSelector* selector, int a, int b);
~StyleSheetNode();
/// Writes the style sheet node (and all ancestors) into the stream.
void Write(Stream* stream);
/// Merges an entire tree hierarchy into our hierarchy.
bool MergeHierarchy(StyleSheetNode* node, int specificity_offset = 0);
/// Builds up a style sheet's index recursively.
void BuildIndex(StyleSheet::NodeIndex& styled_index, StyleSheet::NodeIndex& complete_index);
/// Returns the name of this node.
const String& GetName() const;
/// Returns the specificity of this node.
int GetSpecificity() const;
/// Imports properties from a single rule definition into the node's properties and sets the
/// appropriate specificity on them. Any existing attributes sharing a key with a new attribute
/// will be overwritten if they are of a lower specificity.
/// @param[in] properties The properties to import.
/// @param[in] rule_specificity The specificity of the importing rule.
void ImportProperties(const PropertyDictionary& properties, int rule_specificity);
/// Merges properties from another node (ie, with potentially differing specificities) into the
/// node's properties. Any existing properties sharing a key with a new attribute will be
/// overwritten if they are of a lower specificity.
/// @param[in] properties The properties to merge with this node's.
/// @param[in] rule_specificity_offset The offset of the importing properties' specificities.
void MergeProperties(const PropertyDictionary& properties, int rule_specificity_offset);
/// Returns the node's default properties.
const PropertyDictionary& GetProperties() const;
/// Merges the properties of all of the pseudo-classes of this style sheet node into a single map.
/// @param pseudo_class_properties[out] The dictionary to fill with the pseudo-class properties.
void GetPseudoClassProperties(PseudoClassPropertyMap& pseudo_class_properties) const;
/// Adds to a list the names of this node's pseudo-classes which are deemed volatile; that is, which will
/// potentially affect child node's element definition if set or unset.
/// @param volatile_pseudo_classes[out] The list of volatile pseudo-classes.
bool GetVolatilePseudoClasses(PseudoClassList& volatile_pseudo_classes) const;
/// Returns a direct child node of this node of the requested type.
/// @param name The name of the child node to fetch.
/// @param type The type of node to fetch; this must be one of either TAG, CLASS, ID, PSEUDO_CLASS or PSEUDO_CLASS_STRUCTURAL.
/// @param create If set to true, the node will be created if it doesn't exist.
StyleSheetNode* GetChildNode(const String& name, NodeType type, bool create = true);
/// Returns true if this node is applicable to the given element, given its IDs, classes and heritage.
bool IsApplicable(const Element* element) const;
/// Appends all applicable non-tag descendants of this node into the given element list.
void GetApplicableDescendants(std::vector< const StyleSheetNode* >& applicable_nodes, const Element* element) const;
/// Returns true if this node employs a structural selector, and therefore generates element definitions that are
/// sensitive to sibling changes.
/// @return True if this node uses a structural selector.
bool IsStructurallyVolatile(bool check_ancestors = true) const;
private:
// Constructs a structural pseudo-class child node.
StyleSheetNode* CreateStructuralChild(const String& child_name);
// Recursively builds up a list of all pseudo-classes branching from a single node.
void GetPseudoClassProperties(PseudoClassPropertyMap& pseudo_class_properties, const StringList& ancestor_pseudo_classes);
int CalculateSpecificity();
// The parent of this node; is NULL for the root node.
StyleSheetNode* parent;
// The name and type.
String name;
NodeType type;
// The complex selector for this node; only used for structural nodes.
StyleSheetNodeSelector* selector;
int a;
int b;
// A measure of specificity of this node; the attribute in a node with a higher value will override those of a
// node with a lower value.
int specificity;
// The generic properties for this node.
PropertyDictionary properties;
// This node's child nodes, whether standard tagged children, or further derivations of this tag by ID or class.
typedef std::map< String, StyleSheetNode* > NodeMap;
NodeMap children[NUM_NODE_TYPES];
};
}
}
#endif
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