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#define BTREE_IMPLEMENTATION
#define BASE_UNITY
#include "base/base_include.h"
internal b32
is_alpha(u8 point)
{
return ((point >= 'a' && point <= 'z') || (point >= 'A' && point <= 'Z') || (point == '_'));
}
internal b32
is_digit(u8 point)
{
return (point >= '0' && point <= '9');
}
internal b32
is_alpha_num(u8 point)
{
return (is_alpha(point) || is_digit(point));
}
internal b32
is_whitespace(u8 point)
{
return (point == '\n' || point == '\r' || point == ' ' || point == '\t');
}
internal b32
is_delimiter(u8 point)
{
return (point == ',');
}
#include "btree_impl.h"
#include "csv_decoder.h"
typedef struct query_token query_token;
struct query_token
{
string8 lexeme;
query_token *next;
};
typedef struct query_token_list query_token_list;
struct query_token_list
{
query_token *start_token;
query_token *current_token;
};
read_only global_variable
query_token nil_query_token =
{
.lexeme = {.data = NULL, .size = 0},
.next = &nil_query_token
};
read_only global_variable
query_token_list nil_query_token_list =
{
.start_token = &nil_query_token,
.current_token = &nil_query_token,
};
internal b32
is_nil_query_token(query_token *token)
{
return (token == &nil_query_token) || (token == NULL);
}
internal b32
is_nil_query_token_list(query_token *token)
{
return (token == &nil_query_token) || (token == NULL);
}
// takes on line of the repl input
// return a reference to the passed list
internal query_token_list *
query_tokenizer(mem_arena *arena, string8 *buffer, query_token_list *list)
{
b32 initialized = 0;
unused(initialized);
for (u64 index = 0; index < buffer->size; ++index)
{
u8 codepoint = buffer->data[index];
if(codepoint == '\n' || codepoint == '\r') break;
s32 start = 0;
s32 end = 0;
if(is_whitespace(codepoint)) end = index;
// save the token
// TODO(nasr): work on the string macros cuz no work
{
query_token *new_token = PushStruct(arena, query_token);
//- initialize list
{
if(is_nil_query_token(list->start_token))
{
list->start_token = new_token;
list->current_token = new_token;
}
else
{
//- all we need to do - we dont track parents or what ever. this is a token stream not a tree
list->current_token->next = new_token;
}
}
s32 new_token_size = end - start;
new_token->lexeme = PushString(arena, new_token_size);
new_token->lexeme.data = &buffer->data[index];
new_token->lexeme.size = new_token_size;
list->current_token->next = new_token;
start = index + 1;
}
}
return list;
}
int main(int count, char **value)
{
#if 1
unused(nil_query_token_list);
#endif
if(count < 2) value[1] = "./test/data.csv";
local_persist b32 running = 1;
mem_arena *global_arena = arena_create(GiB(1));
string8 buffer = load_file(global_arena, value[1]);
// NOTE(nasr): the use of tables is required for tracking headers etc.
// i think we can optimize this away in the future but for now its fine
csv_table *table = PushStructZero(global_arena, csv_table);
csv_token_list *token_list = PushStructZero(global_arena, csv_token_list);
token_list->start_token = &nil_csv_token;
token_list->end_token = &nil_csv_token;
csv_token *tokens = tokenize_csv(buffer, global_arena, table, token_list);
assert_msg(tokens != NULL, "tokens are null");
// NOTE(nasr): token_list is now populated — pass it directly, not a fresh empty list
btree *bt = parse_csv(global_arena, token_list, table);
print("\nDatabase Engine\n");
for(;;)
{
if(running)
{
u8 *lbuf = PushArray(global_arena, u8, 256);
s32 err = os_read(STDIN_FD, lbuf, 256);
if(err < 0)
{
print("error reading from stdin");
}
// TODO(nasr): extract this later in the future and make a string copy function/macro
// @params (s32 lbuf_size, string8 lbuf_stringified)
// NOTE(nasr): use err (bytes read) not sizeof(lbuf*) — sizeof a pointer is always 8
s32 lbuf_size = err;
string8 lbuf_stringified = PushString(global_arena, lbuf_size);
{
memcpy(lbuf_stringified.data, lbuf, lbuf_size);
lbuf_stringified.size = lbuf_size;
}
query_token_list *qtl = PushStructZero(global_arena, query_token_list);
query_tokenizer(global_arena, &lbuf_stringified, qtl);
// TODO(nasr): dispatch qtl against bt here
unused(bt);
sleep(1);
}
}
return 0;
}
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