/* date = July 9th 2023 8:04 pm */

#ifndef VN_TOKENIZER_H
#define VN_TOKENIZER_H

////////////////////////////////
//~ sixten: Token Types
typedef u32 token_flags;
enum
{
    TokenFlag_Identifier          = (1<<0),
    TokenFlag_Numeric             = (1<<1),
    TokenFlag_StringLiteral       = (1<<2),
    TokenFlag_Symbol              = (1<<3),
    TokenFlag_Reserved            = (1<<4),
    TokenFlag_Comment             = (1<<5),
    TokenFlag_Whitespace          = (1<<6),
    TokenFlag_Newline             = (1<<7),
    
    TokenFlag_BrokenComment       = (1<<8),
    TokenFlag_BrokenStringLiteral = (1<<9),
    TokenFlag_BadCharacter        = (1<<10),
};

typedef u32 token_group;
enum
{
    TokenGroup_Comment    =  TokenFlag_Comment,
    TokenGroup_Whitespace = (TokenFlag_Whitespace |
                             TokenFlag_Newline),
    TokenGroup_Irregular  = (TokenGroup_Comment |
                             TokenGroup_Whitespace),
    TokenGroup_Regular    = ~TokenGroup_Irregular,
    TokenGroup_Label      = (TokenFlag_Identifier    |
                             TokenFlag_Numeric       |
                             TokenFlag_StringLiteral |
                             TokenFlag_Symbol),
    TokenGroup_Error      = (TokenFlag_BrokenComment       |
                             TokenFlag_BrokenStringLiteral |
                             TokenFlag_BadCharacter),
};

struct token
{
    token_flags Flags;
    range1_s64 Range;
};

struct token_chunk_node
{
    token *Tokens;
    s64 MaxCount;
    s64 Count;
    token_chunk_node *Next;
};

struct token_chunk_list
{
    token_chunk_node *First;
    token_chunk_node *Last;
    s64 Count;
};

struct token_array
{
    token *Tokens;
    s64 Count;
};

////////////////////////////////
//~ sixten: Tokenizer Message Types
enum tokenizer_message_kind
{
    T_MessageKind_Invalid,
    T_MessageKind_Note,
    T_MessageKind_Warning,
    T_MessageKind_Error,
};

struct tokenizer_message
{
    tokenizer_message *Next;
    tokenizer_message_kind Kind;
    s64 Offset;
    string String;
};

struct tokenizer_message_list
{
    tokenizer_message *First;
    tokenizer_message *Last;
    s64 Count;
};

////////////////////////////////
//~ sixten: Text -> Token Types
struct tokenize_result
{
    token_array Tokens;
    tokenizer_message_list Messages;
};

////////////////////////////////
//~ sixten: Token Type Functions
static string T_StringFromToken(string Text, token Token);
static b32 T_TokenMatches(token Token, token_flags Flags, string Text, string String);
static void T_TokenChunkListPush(memory_arena *Arena, token_chunk_list *List, token Token, s64 MaxTokenCountPerNode);
static token_array T_TokenArrayFromChunkList(memory_arena *Arena, token_chunk_list *List);

////////////////////////////////
//~ sixten: Tokenizer Message Functions
static void T_MessageListPush(memory_arena *Arena, tokenizer_message_list *List, tokenizer_message_kind Kind, s64 Offset, string String);

////////////////////////////////
//~ sixten: Text -> Token Functions
static tokenize_result T_TokenizeFromText(memory_arena *Arena, string Filename, string Text, token_flags ExcludeFilter = 0);

#endif //VN_TOKENIZER_H