1 files changed, 206 insertions, 0 deletions

diff --git a/source/tb_db.c b/source/tb_db.c
new file mode 100644
index 0000000..b992111
--- /dev/null
+++ b/source/tb_db.c
@@ -0,0 +1,206 @@
+#define B_TREE_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 "b_tree_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(MiB(30));
+
+    // NOTE(nasr): see note down below
+    // csv_table *global_table = PushStruct(global_arena, csv_table);
+
+    string8 buffer = load_file(global_arena, value[1]);
+
+    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)
+                s32 lbuf_size             = sizeof(lbuf) - 1;
+                string8 lbuf_stringified  = PushString(global_arena, lbuf_size);
+                {
+                    memcpy(lbuf_stringified.data, lbuf, lbuf_size);
+                    lbuf_stringified.size  = sizeof(lbuf) - 1;
+                }
+
+                query_token_list *qtl = PushStruct(global_arena, query_token_list);
+
+                query_tokenizer(global_arena, &lbuf_stringified, qtl);
+            }
+
+            {
+
+                // 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 = PushStruct(global_arena, csv_table);
+
+                csv_token_list *token_list = PushStruct(global_arena, csv_token_list);
+
+                csv_token *tokens = tokenize_csv(buffer, global_arena, table, token_list);
+
+                assert_msg(tokens != NULL, "Tokens are NULL.");
+
+                csv_token_list *ctl = PushStruct(global_arena, csv_token_list);
+                b_tree *bt = parse_csv(global_arena, ctl, table);
+
+                b_tree_write(bt);
+            }
+
+            // NOTE(nasr): not sure on how to approach the b-tree and the  table format thing
+            // we kind of want our table format i think? but i wouldnt be sure about the use case
+            // so we stick to the regular b_tree for now. commenting out the tables.
+
+            sleep(1);
+        }
+    }
+
+    return 0;
+}