variant_parser.h

#ifndef VARIANT_PARSER_H
#define VARIANT_PARSER_H

#include "variant.h"
#include "os/file_access.h"
#include "resource.h"

class VariantParser {
public:

    struct Stream {

        virtual CharType get_char()=0;
        virtual bool is_utf8() const=0;
        virtual bool is_eof() const=0;

        CharType saved;

        Stream() { saved=0; }
        virtual ~Stream() {}
    };

    struct StreamFile : public Stream {

        FileAccess *f;

        virtual CharType get_char();
        virtual bool is_utf8() const;
        virtual bool is_eof() const;

        StreamFile() { f=NULL; }

    };

    struct StreamString : public Stream {

        String s;
        int pos;

        virtual CharType get_char();
        virtual bool is_utf8() const;
        virtual bool is_eof() const;

        StreamString() { pos=0; }

    };

    typedef Error (*ParseResourceFunc)(void* p_self, Stream* p_stream,Ref<Resource>& r_res,int &line,String &r_err_str);

    struct ResourceParser {

        void *userdata;
        ParseResourceFunc func;
        ParseResourceFunc ext_func;
        ParseResourceFunc sub_func;

    };

    enum TokenType {
        TK_CURLY_BRACKET_OPEN,
        TK_CURLY_BRACKET_CLOSE,
        TK_BRACKET_OPEN,
        TK_BRACKET_CLOSE,
        TK_PARENTHESIS_OPEN,
        TK_PARENTHESIS_CLOSE,
        TK_IDENTIFIER,
        TK_STRING,
        TK_NUMBER,
        TK_COLOR,
        TK_COLON,
        TK_COMMA,
        TK_PERIOD,
        TK_EQUAL,
        TK_EOF,
        TK_ERROR,
        TK_MAX
    };

    enum Expecting {

        EXPECT_OBJECT,
        EXPECT_OBJECT_KEY,
        EXPECT_COLON,
        EXPECT_OBJECT_VALUE,
    };

    struct Token {

        TokenType type;
        Variant value;
    };

    struct Tag {

        String name;
        Map<String,Variant> fields;
    };

private:
    static const char * tk_name[TK_MAX];

    template<class T>
    static Error _parse_construct(Stream *p_stream, Vector<T>& r_construct, int &line, String &r_err_str);
    static Error _parse_enginecfg(Stream *p_stream, Vector<String>& strings, int &line, String &r_err_str);
    static Error _parse_dictionary(Dictionary &object, Stream *p_stream, int &line, String &r_err_str,ResourceParser *p_res_parser=NULL);
    static Error _parse_array(Array &array, Stream *p_stream, int &line, String &r_err_str,ResourceParser *p_res_parser=NULL);
    static Error _parse_tag(Token& token,Stream *p_stream, int &line, String &r_err_str,Tag& r_tag,ResourceParser *p_res_parser=NULL,bool p_simple_tag=false);

public:

    static Error parse_tag(Stream *p_stream, int &line, String &r_err_str,Tag& r_tag,ResourceParser *p_res_parser=NULL,bool p_simple_tag=false);
    static Error parse_tag_assign_eof(Stream *p_stream, int &line, String &r_err_str, Tag& r_tag, String &r_assign, Variant &r_value,ResourceParser *p_res_parser=NULL,bool p_simple_tag=false);

    static Error parse_value(Token& token,Variant &value, Stream *p_stream, int &line, String &r_err_str,ResourceParser *p_res_parser=NULL);
    static Error get_token(Stream *p_stream,Token& r_token,int &line,String &r_err_str);
    static Error parse(Stream *p_stream, Variant &r_ret, String &r_err_str, int &r_err_line,ResourceParser *p_res_parser=NULL);
};




class VariantWriter {
public:

    typedef Error (*StoreStringFunc)(void *ud,const String& p_string);
    typedef String (*EncodeResourceFunc)(void *ud,const RES& p_resource);

    static Error write(const Variant& p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud,EncodeResourceFunc p_encode_res_func,void* p_encode_res_ud);
    static Error write_to_string(const Variant& p_variant, String& r_string, EncodeResourceFunc p_encode_res_func=NULL,void* p_encode_res_ud=NULL);


};






#endif // VARIANT_PARSER_H