better structure etc

src/parser.h

@@ -0,0 +1,219 @@
+#include "./lexer.h"
+#define NB_IMPLEMENTATION
+#include "./nb.h"
+
+int get_prec(symbols op){
+  switch (op) {
+    case TOKEN_MUL:
+    case TOKEN_DIV:
+       return 2; break;
+    case TOKEN_PLUS:
+    case TOKEN_MINUS:
+      return 1; break;
+    default: return 0;
+  }
+}
+// parse
+
+bool is_left_asc(symbols op){
+  switch (op) {
+    case TOKEN_MUL:
+    case TOKEN_DIV:
+    case TOKEN_PLUS:
+    case TOKEN_MINUS:
+      return true; break;
+    default: return false;
+  }
+}
+
+Token *global_tok = NULL;
+
+typedef enum {
+  SYM_VAR,
+  SYM_FUNC,
+} SymbolKind;
+
+typedef struct {
+  const char* name;
+  size_t ret_count;
+  size_t arg_count;
+  symbols arg_types[16];
+  symbols ret_type;
+  SymbolKind symbol_kind;
+  bool builtin;
+} Symbol;
+
+
+// static Symbol builtins[] = {
+//     { "print", 1, 1, { TOKEN_UNKNOWN }, TOKEN_EOF, SYM_FUNC, true },
+// };
+
+
+typedef struct {
+  Symbol *symbols;
+  size_t size;
+  size_t capacity;
+} SymbolTable; 
+
+
+// static int builtin_num = sizeof(builtins)/sizeof(builtins[0]);
+
+// static SymbolTable global_env = {
+//   .size = sizeof(builtins)/sizeof(builtins[0]),
+//   .capacity = sizeof(builtins)/sizeof(builtins[0]),
+//   .symbols = builtins};
+
+
+Symbol *symbol_lookup(SymbolTable *table, const char *n){
+  for (size_t i=0; i<table->size; ++i){
+    if(strcmp(n, table->symbols[i].name) == 0){
+      return &table->symbols[i];
+    }
+  }
+  return NULL;
+}
+
+// fn add(x: int, y: int) int {
+//   return x+y;
+// }
+
+
+void symbol_table_init(SymbolTable *table, size_t initial_capacity) {
+    table->symbols = malloc(sizeof(Symbol) * initial_capacity);
+    if (!table->symbols) {
+        fprintf(stderr, "symbol_table_init: malloc failed\n");
+        exit(1);
+    }
+    table->size = 0;
+    table->capacity = initial_capacity;
+}
+
+void symbol_table_add(SymbolTable *table, Symbol sym) {
+    if (table->size >= table->capacity) {
+        table->capacity = (table->capacity == 0) ? 8 : table->capacity * 2;
+        table->symbols = realloc(table->symbols, sizeof(Symbol) * table->capacity);
+        if (!table->symbols) {
+            fprintf(stderr, "symbol_table_add: realloc failed\n");
+            exit(1);
+        }
+    }
+    table->symbols[table->size++] = sym;
+}
+
+
+void symbol_table_free(SymbolTable *table) {
+    free(table->symbols);
+    table->symbols = NULL;
+    table->size = 0;
+    table->capacity = 0;
+}
+
+
+Token build_rpn(Token *inp, SymbolTable *symtab) {
+    Token output;
+    Token stack;
+
+    token_init(&output, 16);
+    token_init(&stack, 16);
+
+    for (size_t i = 0; i < inp->size; ++i) {
+        symbols type = inp->type[i];
+        const char *text = inp->text[i];
+
+        if (type == TOKEN_IDENTIFIER && i + 1 < inp->size && inp->type[i + 1] == TOKEN_LPAREN) {
+            Symbol *found = symbol_lookup(symtab, text);
+            if (!found) {
+                Symbol sym = {
+                    .name = strdup(text),
+                    .arg_count = 0,
+                    .ret_type = TOKEN_EOF,
+                    .symbol_kind = SYM_FUNC,
+                    .builtin = false
+                };
+                symbol_table_add(symtab, sym);
+            }
+            token_push(&stack, type, text, inp->behaviour[i], 0);
+        } else if (type == TOKEN_IDENTIFIER) {
+            Symbol *found = symbol_lookup(symtab, text);
+            if (!found) {
+                Symbol sym = {
+                    .name = strdup(text),
+                    .arg_count = 0,
+                    .ret_type = TOKEN_UNKNOWN,
+                    .symbol_kind = SYM_VAR,
+                    .builtin = false
+                };
+                symbol_table_add(symtab, sym);
+            }
+            token_push(&output, type, text, inp->behaviour[i], 0);
+        } else if (type == TOKEN_LPAREN) {
+            token_push(&stack, type, text, inp->behaviour[i], 0);
+        } else if (type == TOKEN_RPAREN) {
+            while (stack.size > 0 && stack.type[stack.size - 1] != TOKEN_LPAREN) {
+                token_push(&output, stack.type[stack.size - 1],
+                           stack.text[stack.size - 1],
+                           stack.behaviour[stack.size - 1], 0);
+                stack.size--;
+            }
+            if (stack.size > 0 && stack.type[stack.size - 1] == TOKEN_LPAREN)
+                stack.size--;
+            if (stack.size > 0 && stack.type[stack.size - 1] == TOKEN_IDENTIFIER) {
+                token_push(&output, stack.type[stack.size - 1],
+                           stack.text[stack.size - 1],
+                           stack.behaviour[stack.size - 1], 0);
+                stack.size--;
+            }
+        } else if (type == TOKEN_INTEGER || type == TOKEN_FLOAT || type == TOKEN_STRING) {
+            token_push(&output, type, text, inp->behaviour[i], 0);
+        } else if (is_left_asc(type)) {
+            while (stack.size > 0 && stack.type[stack.size - 1] != TOKEN_LPAREN &&
+                   (get_prec(stack.type[stack.size - 1]) > get_prec(type) ||
+                    get_prec(stack.type[stack.size - 1]) == get_prec(type)) &&
+                   is_left_asc(type)) {
+                token_push(&output, stack.type[stack.size - 1],
+                           stack.text[stack.size - 1],
+                           stack.behaviour[stack.size - 1], 0);
+                stack.size--;
+            }
+            token_push(&stack, type, text, inp->behaviour[i], 0);
+        }
+    }
+
+    while (stack.size > 0) {
+        token_push(&output, stack.type[stack.size - 1],
+                   stack.text[stack.size - 1],
+                   stack.behaviour[stack.size - 1], 0);
+        stack.size--;
+    }
+
+    token_push(&output, TOKEN_EOF, "EOF", BHV_UNDEFINED, 0);
+    return output;
+}
+
+void print_token(Token *tk){
+  for (size_t i=0; i<tk->size; ++i){
+    printf("TokenNum: %zu Type: %s Value: %s\n", i, tk->tktype[i], tk->text[i]);
+  }
+}
+
+
+
+
+// int main(int argc, char **argv){
+//   if (argc < 2) return -1;
+//   const char ts[] = "\"hello\" hi + 2 2.312"; 
+//   const char math[] = "print(((1+2)*6)/18)"; // = 1
+//   const char print[] = "print(\"hello\")";
+//   const char simple[] = "1 + (  3 + 3  )/4+4*3";
+  
+
+//   char* read = nb_read_file(argv[1]);
+//   Token tk = tokenize_all(read);
+//   printf("INPUT: %s\n", read);
+//   SymbolTable table = {0};
+//   symbol_table_init(&table, 32);
+
+
+//   Token rpn = build_rpn(&tk, &table);
+//   print_token(&rpn); 
+// }