#ifndef LEX_H
#define LEX_H

#include "typeutils.h"


typedef struct Region Region;


typedef enum {
    UN_Q,
    SINGLE_Q,
    DOUBLE_Q,
} QuotationMode;

typedef enum {
    LITERAL,
    REGION_EXP,
    VAR_EXP,    // TODO: Later include other exps
} ChunkKind;

typedef struct {
    ChunkKind kind;
    QuotationMode qmode;
    union {
        char* literal_str;
        Region* reg_ptr;
        char* varname;
    } as;
} Chunk;


DECLARE_VEC(Chunk, Word)

DECLARE_VEC(Word, WordVec)

typedef enum {
    TOK_WORD,
    TOK_SPECIAL,
    TOK_PROCSUB_IN,
    TOK_PROCSUB_OUT,
} TokenKind;

typedef enum {
    PIPE,
    WRITE_REDIR_TRUNC,
    WRITE_REDIR_APPEND,
    READ_REDIR,
    EOL,
} SpecialToken;

typedef struct {
    TokenKind kind;

    union {
        Word word;
        SpecialToken spec; 
        Region* procsub_region;
    } as;
} Token;
    

DECLARE_VEC(Token, TokenVec)

DECLARE_MAYBE(SpecialToken, MaybeSpecialToken)  

typedef enum {
    CMDS,
    ARITHM,
} RegionMode;

struct Region {
    RegionMode mode;
    TokenVec tokens; 
};

DECLARE_MAYBE(Chunk, MaybeChunk);

DECLARE_VEC(Region, RegionVec)


typedef struct {
    TokenVec top_tokens;
    RegionVec reg_arena;
} LexResult;


LexResult lex(char* input);

#endif