/*

 * Copyright 2006 The Android Open Source Project

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkDOM_DEFINED

#define SkDOM_DEFINED

#include "include/core/SkScalar.h"

#include "include/core/SkTypes.h"

#include "include/private/base/SkNoncopyable.h"

#include "include/private/base/SkTemplates.h"

#include "src/base/SkArenaAlloc.h"

struct SkDOMNode;

struct SkDOMAttr;

class SkDOMParser;

class SkStream;

class SkXMLParser;

class SkDOM : public SkNoncopyable {

public:

    SkDOM();

    ~SkDOM();

    typedef SkDOMNode Node;

    typedef SkDOMAttr Attr;

    /** Returns null on failure

    */

    const Node* build(SkStream&);

    const Node* copy(const SkDOM& dom, const Node* node);

    const Node* getRootNode() const;

    SkXMLParser* beginParsing();

    const Node* finishParsing();

    enum Type {

        kElement_Type,

        kText_Type

    };

    Type getType(const Node*) const;

    const char* getName(const Node*) const;

    const Node* getFirstChild(const Node*, const char elem[] = nullptr) const;

    const Node* getNextSibling(const Node*, const char elem[] = nullptr) const;

    const char* findAttr(const Node*, const char attrName[]) const;

    const Attr* getFirstAttr(const Node*) const;

    const Attr* getNextAttr(const Node*, const Attr*) const;

    const char* getAttrName(const Node*, const Attr*) const;

    const char* getAttrValue(const Node*, const Attr*) const;

    // helpers for walking children

    int countChildren(const Node* node, const char elem[] = nullptr) const;

    // helpers for calling SkParse

    bool findS32(const Node*, const char name[], int32_t* value) const;

    bool findScalars(const Node*, const char name[], SkScalar value[], int count) const;

    bool findHex(const Node*, const char name[], uint32_t* value) const;

    bool findBool(const Node*, const char name[], bool*) const;

    int  findList(const Node*, const char name[], const char list[]) const;

    bool findScalar(const Node* node, const char name[], SkScalar value[]) const {

        return this->findScalars(node, name, value, 1);

    }

    bool hasAttr(const Node*, const char name[], const char value[]) const;

    bool hasS32(const Node*, const char name[], int32_t value) const;

    bool hasScalar(const Node*, const char name[], SkScalar value) const;

    bool hasHex(const Node*, const char name[], uint32_t value) const;

    bool hasBool(const Node*, const char name[], bool value) const;

    class AttrIter {

    public:

        AttrIter(const SkDOM&, const Node*);

        const char* next(const char** value);

    private:

        const Attr* fAttr;

        const Attr* fStop;

    };

private:

    SkArenaAllocWithReset        fAlloc;

    Node*                        fRoot;

    std::unique_ptr<SkDOMParser> fParser;

    using INHERITED = SkNoncopyable;

};

#endif