Added exec, grammar files.

src/exec.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "include/ast.h"
+#include "include/exec.h"
+#include "include/util.h"
+
+void exec(AST* ast) {
+    log_dbg("Started execution.");
+    switch (ast->type) {
+    case AST_TYPE_CALL: exec_call(ast); break;
+    default:            printf("what\n");
+    }
+}
+
+void exec_call(AST* ast) {
+    log_dbg("Started call execution.");
+    ASTTypeCall* calldata = (ASTTypeCall*)ast->data;
+    if (!strcmp(calldata->to, "+") && calldata->argc == 2) {
+
+        exec_return(1);
+        /*
+        ASTTypeNum* n1 = (ASTTypeNum*)calldata->argv[0]->data;
+        ASTTypeNum* n2 = (ASTTypeNum*)calldata->argv[1]->data;
+
+        exec_return(n1->val + n2->val);
+        */
+    }
+}
+
+void exec_return(int n) { printf("= %d\n", n); }

src/grammar.y

@@ -5,6 +5,8 @@
 
     int yylex(void);
     void yyerror(char const*);
+
+    AST* root = NULL;
 %}
 
 %code requires {
@@ -34,7 +36,7 @@ input:
 
 line:
     '\n'
-    | exp '\n' { printf("it worked. 👍\n"); }
+    | exp '\n' { root = $1; }
     ;
 
 exp:

src/include/exec.h

@@ -0,0 +1,10 @@
+#ifndef EXEC_H
+#define EXEC_H
+
+#include "ast.h"
+
+void exec(AST* ast);
+void exec_call(AST* ast);
+void exec_return(int n);
+
+#endif

src/main.c

@@ -2,13 +2,14 @@
 
 #include "include/ast.h"
 #include "include/dstr.h"
+#include "include/exec.h"
 #include "include/lexer.h"
 #include "include/util.h"
 
 #include "../build/grammars/grammar.tab.h"
 
 // Global Abstract Syntax Tree.
-AST* root = NULL;
+extern AST* root;
 
 extern int yyparse();
 
@@ -30,6 +31,7 @@ int main(int argc, char** argv) {
             lexer_print();
             if (yyparse() == 0) {
                 printf("Parsed successfully!\n");
+                exec(root);
             } else {
                 printf("Parse error.\n");
             }