now we can read files and interpret them

lexer.c

@@ -6,6 +6,8 @@
 #include <string.h>
 #include <sys/types.h>
 #include <stdbool.h>
+#define NB_IMPLEMENTATION
+#include "nb.h"
 
 typedef struct{
   char* mstr;
@@ -41,9 +43,9 @@ typedef enum{
   TOKEN_STRING,
   TOKEN_MUL,
   TOKEN_DIV,
-  intdef,
   TOKEN_UNKNOWN,
   TOKEN_EOF,
+  TOKEN_NEWLINE
 } symbols;
 
 typedef enum{
@@ -54,9 +56,6 @@ typedef enum{
   BHV_FLOAT,
 } symbol_bhv;
 
-
-
-
 typedef struct{
   symbols type;
   char* text;
@@ -66,18 +65,11 @@ typedef struct{
   symbols previous_token;
 } Token;
 
-// since I now have tokenize all I dont really need previous_token. I can just ast walk it without each individual token carrying all data
-
 typedef struct{
   Token* unit;
   size_t size;
   size_t capacity;
 } TokenArr;
-// maybe should add cursor even for TokenArr to use C's printf % to add whitespace in order to move something like this
-// input = 1 + 323 + =-=-
-//                   ^
-//                   |- Unknown Token 
-
 
 typedef struct{
   char *content;
@@ -85,9 +77,6 @@ typedef struct{
   // size_t line;
 } Lexer;
 
-
-// will not nesseccarilly use AST. just could be useful in the future.
-
 typedef enum{
   AST_NUMBER,
   AST_BINARY_OP,
@@ -111,7 +100,6 @@ typedef struct{
   Token* tokens;
   size_t cursor;
 } parser;
-// tokenArr to token*
 
 // Lexer 
 void lexer_new(char *content, size_t content_len){
@@ -172,7 +160,6 @@ ASTNode* parse_factor(parser* p) {
     exit(EXIT_FAILURE);
 }
 
-
 ASTNode* parse_term(parser* p) {
     ASTNode* node = parse_factor(p);
     while (true) {
@@ -188,7 +175,6 @@ ASTNode* parse_term(parser* p) {
     return node;
 }
 
-
 ASTNode* parse_expression(parser* p) {
     ASTNode* node = parse_term(p);
     while (true) {
@@ -221,11 +207,6 @@ double eval_ast(ASTNode* node) {
     }
 }
 
-
-
-
-// will implement a stack for arithmetic later. do I want a compiler or interpreter? since this is a learning experience im gonna do the easier thing first
-
 Token read_from_tok(char* text, uint cursor){ 
     Token mytoks;
     
@@ -233,9 +214,6 @@ Token read_from_tok(char* text, uint cursor){
     size_t i = 0;
     mytoks.cursor_skip = 1;
 
-    // integer logic. will have to somehow detect "." for floats but it will be hard to do because the way I wrote this code is shit
-    // ie: checking for . depends on the switch statement. so I will have to maybe add previous_token to the token struct. Actually a feasible idea.
-    // will I need to set previous_token to the current token? maybe.
     if (isdigit(text[cursor])) {
         size_t start = cursor;
         int dots_seen = 0;
@@ -245,10 +223,7 @@ Token read_from_tok(char* text, uint cursor){
             assert(dots_seen < 2);
           }
           buf[i++] = text[cursor++];
-        }
+        } 
-        
-        // recheck this assert later
-          
 
         buf[i] = '\0';
 
@@ -265,7 +240,6 @@ Token read_from_tok(char* text, uint cursor){
         mytoks.text = strdup(buf);
         mytoks.text_len = i;
     } 
-    // string logic 
     else if (isalpha(text[cursor])){
         size_t start = cursor;
         while (isalpha(text[cursor])) {
@@ -283,13 +257,13 @@ Token read_from_tok(char* text, uint cursor){
        buf[0] = text[cursor];
        buf[1] = '\0';
        
-       switch (text[cursor]){
+       switch (text[cursor])
+       {
          case '+':
            mytoks.type = TOKEN_PLUS;
-         // asigning text is not really needed unless for debug. could however be useful for codegen later. NOW IT BECAME A MUST LOL
            mytoks.text = strdup("+");
            mytoks.behaviour = BHV_STACK;
-                      break;
+           break;
          case '-':
            mytoks.type = TOKEN_MINUS;
            mytoks.text = strdup("-");
@@ -309,6 +283,11 @@ Token read_from_tok(char* text, uint cursor){
           mytoks.text = strdup("/");
           mytoks.behaviour = BHV_STACK;
           break;
+         case '\n':
+          mytoks.type = TOKEN_NEWLINE;
+          mytoks.text = strdup("newline");
+          mytoks.cursor_skip = 1;
+          break;
          default:
            mytoks.type = TOKEN_UNKNOWN;
            mytoks.behaviour = BHV_UNDEFINED;
@@ -336,7 +315,7 @@ TokenArr tokenize_all(const char* input) {
     while (i < len) {
         Token tok = read_from_tok((char*)input, i);
         i += tok.cursor_skip;
-        if (tok.type == TOKEN_SPACE) {
+        if (tok.type == TOKEN_SPACE || tok.type == TOKEN_NEWLINE) {
             free(tok.text);
             continue;
         }
@@ -395,23 +374,22 @@ char* token_type_to_string(symbols type) {
         case TOKEN_FLOAT:    return "TOKEN_FLOAT";
         case TOKEN_SPACE:    return "TOKEN_SPACE";
         case TOKEN_STRING:   return "TOKEN_STRING";
-        case intdef:         return "intdef";
         case TOKEN_UNKNOWN:  return "TOKEN_UNKNOWN";
         default:             return "UNKNOWN_SYMBOL";
     }
 }
 
-void main2() {
+// void main2() {
-    char* input = "323.23 + Hello world 102102";
+//     char* input = "323.23 + Hello world 102102";
-    int length1 = strlen(input);
+//     int length1 = strlen(input);
-    int i = 0;
+//     int i = 0;
-    printf("input: %s\n\n", input);
+//     printf("input: %s\n\n", input);
-    while (i < length1) {
+//     while (i < length1) {
-        Token result = read_from_tok(input, i); 
+//         Token result = read_from_tok(input, i); 
-        printf("text: %s\ntype: %u (%s)\n\n", result.text, result.type, token_type_to_string(result.type));
+//         printf("text: %s\ntype: %u (%s)\n\n", result.text, result.type, token_type_to_string(result.type));
-        i += result.cursor_skip;  
+//         i += result.cursor_skip;  
-    }
+//     }
-}
+// }
 
 
 
@@ -482,44 +460,46 @@ void mathparser(const char* input) {
 }
 
 
-int main4() {
+// int main4() {
-    char* input = "print(5) hello";
+//     char* input = "print(5) hello";
-    printf("input: %s\n\n", input);
+//     printf("input: %s\n\n", input);
-
+//
-    TokenArr arr = tokenize_all(input);
+//     TokenArr arr = tokenize_all(input);
-        
+//
-    for (size_t j = 0; j < arr.size; ++j) {
+//     for (size_t j = 0; j < arr.size; ++j) {
-        Token* result = &arr.unit[j];
+//         Token* result = &arr.unit[j];
-        printf("text: %s\ntype: %u (%s)\n\n", result->text, result->type, token_type_to_string(result->type));
+//         printf("text: %s\ntype: %u (%s)\n\n", result->text, result->type, token_type_to_string(result->type));
-    }
+//     }
-    
+//
-    printf("================ Tokenized =================\n");
+//     printf("================ Tokenized =================\n");
-    
+//
-    for (size_t j = 0; j < arr.size; ++j) {
+//     for (size_t j = 0; j < arr.size; ++j) {
-        Token* result = &arr.unit[j];
+//         Token* result = &arr.unit[j];
-        printf("text: %s, type: %u (%s) || ", result->text, result->type, token_type_to_string(result->type));
+//         printf("text: %s, type: %u (%s) || ", result->text, result->type, token_type_to_string(result->type));
-    }
+//     }
-    printf("\n");
+//     printf("\n");
-    for (size_t j = 0; j < arr.size; ++j) {
+//     for (size_t j = 0; j < arr.size; ++j) {
-      free(arr.unit[j].text);
+//       free(arr.unit[j].text);
-    }
+//     }
-    free(arr.unit);
+//     free(arr.unit);
-    return 0;
+//     return 0;
-}
+// }
 
 
 
 
 
-int main5(){
+// int main5(){
-    char* input = "40/2.3 * 10 + 400";
+//     char* input = "40/2.3 * 10 + 400";
-    printf("input: %s\n", input);
+//     printf("input: %s\n", input);
-    mathparser(input);  
+//     mathparser(input);
-}
+//     return 0;
+// }
 
 
-int main() {
+int main(int argc, char** argv) {
-    const char* input = "40/2.3 * 10 + 400 - 5";
+    if (argc > 1){
+    char* input = nb_read_file(argv[1]);
     printf("Input: %s\n", input);
 
     TokenArr toks = tokenize_all(input);
@@ -529,6 +509,9 @@ int main() {
 
     double result = eval_ast(root);
     printf("AST Result: %f\n", result);
+  } else {
+    printf("Usage: %s <file>\n", argv[0]);
+  }
+
     return 0;
 }
-

nb.h

@@ -1,7 +1,12 @@
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdbool.h>
 #include <string.h>
 
+
 typedef struct{
   int capacity;
   int arrsize;
@@ -9,6 +14,56 @@ typedef struct{
 } nb_arr;
 
 
+ typedef struct{
+    FILE *filep;
+    size_t filesize;
+    int chars;
+    char *buf;
+  } nb_file;
+
+void nb_init(nb_arr *newarr, int initial_capacity);
+
+void nb_append(nb_arr *newarr, char *newval);
+void nb_append_int(nb_arr *newarr, int myint);
+void nb_append_float(nb_arr *newarr, float myfloat);
+
+void nb_free(nb_arr *newarr);
+
+
+char* nb_strdup(const char* s); // make this void that uses realloc later.
+
+void nb_print(nb_arr *newarr);
+void nb_print_info(nb_arr *newarr);
+
+
+void nb_cmd(nb_arr *newarr);
+
+// void copy_file(char* old_file_name, char* new_file_name);
+
+void nb_copy_file(char* old_file_name, char* new_file_name);
+
+//bool needs_rebuild(); // need to implement rename file first to .old or something like nob does
+
+
+bool nb_did_file_change(char *filename);
+
+
+bool nb_does_file_exist(char *filename);
+
+
+void nb_rebuild(char filename[]);
+
+char* nb_read_file(char* file_name);
+
+
+#ifdef NB_IMPLEMENTATION // make sure to define this before using the header
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
  
 /*
   char* nb_strdup(const char* s) {
@@ -109,3 +164,107 @@ void append_c_file(FILE *filepointer){
 
 }
 
+void nb_copy_file(char* old_file_name, char* new_file_name){ // old name shouldnt be nobuild.c. it should be the name of the current file.
+  nb_file old_file; 
+  nb_file new_file;
+
+  old_file.filep = fopen(old_file_name, "rb");
+  fseek(old_file.filep, 0, SEEK_END);
+  
+  old_file.filesize = ftell(old_file.filep);
+  old_file.buf = (char*)malloc(old_file.filesize);
+  fseek(old_file.filep, 0, SEEK_SET);
+  fread(old_file.buf, 1, old_file.filesize, old_file.filep);
+  fclose(old_file.filep);
+
+  new_file.filep = fopen(new_file_name, "wb");
+  fwrite(old_file.buf, 1, old_file.filesize, new_file.filep);
+  fclose(new_file.filep);
+}
+
+bool nb_did_file_change(char *filename){
+  struct stat file_old;
+  stat(filename, &file_old);
+  
+  struct stat file_new;
+  char buf[64];
+  sprintf(buf, "%s.new", filename);
+  stat(buf, &file_new);
+
+  if (file_old.st_mtim.tv_sec > file_new.st_mtim.tv_sec){
+    return true;
+  } else {
+    return false;
+  }
+}
+
+
+bool nb_does_file_exist(char *filename){
+  char buf[64];
+  sprintf(buf, "%s.new", filename);
+
+    if (access("test.c.new", F_OK) == 0){
+    return true;
+  }
+  return false;
+}
+
+void nb_rebuild(char filename[]){
+  
+  char new_file[128];
+  sprintf(new_file, "%s.new", filename); 
+
+  if (nb_does_file_exist(new_file)){
+    printf("%s does exist\n", new_file);
+    if (nb_did_file_change(filename)){
+      printf("file did change\n");
+      nb_copy_file(filename, new_file);
+
+      nb_arr cmd;
+      char fname[128];
+
+      nb_init(&cmd, sizeof(fname)*2); 
+      strncpy(fname, filename, sizeof(fname));
+      fname[sizeof(fname)-1] = '\0';
+      char *dot = strrchr(fname, '.');
+      if (dot != NULL) {
+        *dot = '\0';
+      }     
+      printf("fname is: %s\n", fname);  
+      
+      nb_append(&cmd, "gcc");
+      nb_append(&cmd, "-o");
+      nb_append(&cmd, fname);
+      nb_append(&cmd, filename);
+      nb_cmd(&cmd);
+
+      nb_print_info(&cmd);
+      printf("rebuilt\n");
+
+  } else {
+    printf("file did not change\n");
+    }
+  }else{
+    printf("created %s", filename);
+    nb_copy_file(filename, new_file);
+  }
+}
+
+char* nb_read_file(char* file_name){ // old name shouldnt be nobuild.c. it should be the name of the current file.
+  nb_file file; 
+
+  file.filep = fopen(file_name, "rb");
+  fseek(file.filep, 0, SEEK_END);
+  
+  file.filesize = ftell(file.filep);
+  file.buf = (char*)malloc(file.filesize);
+  fseek(file.filep, 0, SEEK_SET);
+  fread(file.buf, 1, file.filesize, file.filep);
+  fclose(file.filep);
+  return file.buf;
+}
+
+
+#endif //NB_IMPLEMENTATION
+
+