feature(main): lots of stuff see description

1. increased compile time warnings to help with some optimizations.
2. impelmeented csv lexing helper functions that do stuff on tokenlists
like appending and concatenating lists with each other
3. realiszed that btree design in faulty so disabled it and will
refactor it in the next approach

1 files changed, 289 insertions, 0 deletions

diff --git a/source/csv_decoder.h b/source/csv_decoder.h
new file mode 100644
index 0000000..b754ef5
--- /dev/null
+++ b/source/csv_decoder.h
@@ -0,0 +1,289 @@
+#ifndef ENGINE_LEXER_H
+#define ENGINE_LEXER_H
+
+enum csv_token_flags
+{
+    FL      = 1 << 2,
+};
+
+enum csv_token_type
+{
+    // first 255 tokens  for ascii characters
+    TOKEN_UNDEFINED = 255,
+    TOKEN_IDENTIFIER,
+    TOKEN_VALUE,
+};
+
+typedef struct csv_token csv_token;
+struct csv_token
+{
+    string8 lexeme;
+    csv_token *next_token;
+    enum csv_token_type type;
+    enum csv_token_flags flags;
+};
+
+// NOTE(nasr): i dont think im going to use this.
+typedef struct csv_row csv_row;
+struct csv_row
+{
+    // array of size col_count, points into mmap buffer
+    string8 *fields;
+    s32      count;
+};
+
+#if 0
+typedef struct csv_lntity csv_entity;
+struct csv_entity 
+{
+    //- not needed because we use key header mapping i think
+};
+#endif
+
+typedef struct csv_header csv_header;
+struct csv_header 
+{
+    string8  payload;
+    csv_header *next_header;
+};
+
+typedef struct csv_table csv_table;
+struct csv_table
+{
+    // first row, col names
+    // all data rows
+    csv_header  *header;
+    s32         row_count;
+    s32         header_count;
+};
+
+
+typedef struct csv_token_list csv_token_list;
+struct csv_token_list
+{
+    csv_token *start_token;
+    csv_token *end_token;
+
+};
+
+read_only global_variable
+csv_token nil_csv_token=
+{
+    .lexeme         = {.data = NULL, .size =0},
+    .type           = 0,
+    .flags          = 0,
+    .next_token     = &nil_csv_token,
+
+};
+
+read_only global_variable
+csv_header nil_csv_header = 
+{
+    .payload =  {.data = NULL, .size = 0},
+    .next_header = &nil_csv_header,
+};
+
+read_only global_variable
+csv_token_list nil_csv_token_list =
+{
+    .start_token = &nil_csv_token,
+    .end_token   = &nil_csv_token,
+};
+
+
+read_only global_variable
+csv_row  nil_csv_row =
+{
+    .fields     = &nil_string,
+    .count      = 0,
+};
+
+read_only global_variable
+csv_table nil_csv_table =
+{
+    .header     = &nil_csv_header,
+    .row_count   = 0,
+};
+
+#endif /* ENGINE_LEXER_H */
+
+internal b32 
+is_nil_csv_token(csv_token *token)
+{
+    return ((token == NULL) || (token == &nil_csv_token)); 
+}
+
+internal void
+csv_token_list_append_token(csv_token_list *source_token_list, csv_token *source_token)
+{
+    source_token_list->end_token->next_token = source_token;
+    source_token_list->end_token             = source_token;
+
+}
+
+//- concatenate 2 token lists so we can handle parsing individual rows and concatenating them to eachother
+internal void
+csv_token_list_concat_list(csv_token_list *destination, csv_token_list *source)
+{
+
+    csv_token *source_ct = source->start_token;
+    csv_token *destination_end_ct = destination->end_token;
+
+     for(;!is_nil_csv_token(source_ct); source_ct = source_ct->next_token)
+     {
+         destination_end_ct->next_token = source_ct;
+     }
+
+     destination->end_token = source_ct;
+}
+
+#if 0
+internal csv_token_list *
+parse_csv_row(string8 row_buffer)
+{
+    // csv_token_list *
+
+}
+#endif
+
+
+// the lexer acts as a table builder from a csv  file
+// and parsing indivudal rows and columns
+// the next step would be building a the b-tree
+internal csv_token *
+tokenize_csv(string8 buffer, mem_arena *arena, csv_table *table, csv_token_list *token_list)
+{
+
+    unused(token_list);
+    b32 finding_headers = TRUE;
+
+    if(buffer.size < 0) return NULL;
+
+    csv_token *tok = PushStruct(arena, csv_token);
+
+    // URGENT(nasr): segfaulting because memcpy of strring value doesnt  work dammit
+    // NOPE ITS BEECAUSE WEE DONT LOAD CSV OR SOMTHING???
+    // forgot what the solution was
+    // TODO(nasr): check what the problem here was
+    for(s32 index = 0; buffer.data[index] != '\0'; ++index)
+    {
+        u8 point = buffer.data[index];
+
+        s32 start   = 0;
+        s32 end     = 0;
+
+        if(is_whitespace(point))
+        {
+            warn("csv file is invalid, detected whitespace");
+            return NULL;
+        }
+
+
+        if(point == '\n') 
+        {
+            if(finding_headers)
+            {
+#if 0
+                string8 headers_buffer = {.data = &buffer.data[start], .size = end - start};
+#endif
+                finding_headers = FALSE;
+
+                {
+                    //- map new header token list to table headers
+                }
+            }
+#if 0
+            else
+            {
+
+            }
+#endif
+
+
+            table->row_count++;
+        }
+        else if(point == ',')
+        {
+            if (finding_headers)
+            {
+                table->header_count++;
+            }
+        }
+
+        switch(point)
+        {
+            case('\n'):
+                {
+                    tok->flags |= FL;
+                    break;
+                }
+
+            case(','):
+                {
+                    end = index - 1;
+                    start = index + 1;
+                    break;
+                }
+            default:
+                {
+                    break;
+                }
+        }
+
+        tok->lexeme         = StringCast(&buffer.data[start], end - start);
+        tok->next_token     = tok;
+    }
+
+    return tok;
+}
+
+//- NOTE(nasr): I don't know why we are still using that dumb table but we'll remove it in the future
+internal b_tree *
+parse_csv(mem_arena *arena, csv_token_list *ctl, csv_table *table)
+{
+    b_tree *tree = PushStructZero(arena, b_tree);
+    b_tree_create(arena, tree);
+
+    // iterate over the token list while the token is not nil
+    for (csv_token *ct = ctl->start_token; !is_nil_csv_token(ct); ct = ct->next_token)
+    {
+
+        //- TODO(nasr): check initizalization or something tomorrow
+        {
+            //- are we parsing the first line tokens?
+            //- if so, do something :))
+            if(ct->flags & FL) 
+            {
+                // TODO(nasr): replace with nil header check function
+                if(table->header != &nil_csv_header || table->header == NULL)
+                {
+#if 0
+                    // - no this should happen in the tokenization
+                    table->headers->next =     
+#endif
+                }
+                else 
+                {
+
+                }
+
+            }
+        }
+
+        // TODO(nasr): fix this logic tomorrow
+        csv_token *ct = PushStruct(arena, csv_token);
+        // skip structural ctens, only index values
+        if (ct->type != TOKEN_VALUE)
+        {
+            continue;
+        }
+
+        // NOTE(nasr): payload is the cten itself so the caller can reach
+        // row/col metadata without us having to copy it
+        // NOTE(nasr): heh why do we void cast again?
+        b_tree_insert(tree, ct->lexeme, (void *)ct);
+    }
+
+    return tree;
+}
+