// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#ifndef TB_PARSER_H
#define TB_PARSER_H

#include "../tb_value.h"
#include "../tb_tempbuffer.h"
#include "../tb_str.h"

namespace tb {

/** Unescape backslash codes. This is done in place using the string both as source
    and destination. */
void UnescapeString(char *str);

/** Check if buf is pointing at a end quote. It may need to iterate
    buf backwards toward buf_start to check if any preceding backslashes
    make it a escaped quote (which should not be the end quote) */
bool IsEndQuote(const char *buf_start, const char *buf, const char quote_type);

class TBParserTarget
{
public:
    virtual ~TBParserTarget() {}
    virtual void OnError(int line_nr, const char *error) = 0;
    virtual void OnComment(int line_nr, const char *comment) = 0;
    virtual void OnToken(int line_nr, const char *name, TBValue &value) = 0;
    virtual void Enter() = 0;
    virtual void Leave() = 0;
};

class TBParserStream
{
public:
    virtual ~TBParserStream() {}
    virtual int GetMoreData(char *buf, int buf_len) = 0;
};

class TBParser
{
public:
    enum STATUS {
        STATUS_OK,
        STATUS_OUT_OF_MEMORY,
        STATUS_PARSE_ERROR
    };
    TBParser() { indent_spaces = -1; indent_tabs = false; }
    STATUS Read(TBParserStream *stream, TBParserTarget *target);
private:
    int current_indent;
    int current_line_nr;
    TBStr multi_line_token;
    TBTempBuffer multi_line_value;
    int multi_line_sub_level;
    bool pending_multiline;
    void OnLine(char *line, TBParserTarget *target);
    void OnCompactLine(char *line, TBParserTarget *target);
    void OnMultiline(char *line, TBParserTarget *target);
    void ConsumeValue(TBValue &dst_value, char *&line);

    int indent_spaces;
    bool indent_tabs;
};

}; // namespace tb

#endif // TB_PARSER_H