Basic addition with integers is now available.

src/ast.c

@@ -3,46 +3,12 @@
 #include "include/ast.h"
 #include "include/util.h"
 
-#if 0
+extern AST* root;
+
 static char* asttype_names[] = {
     [AST_TYPE_CALL] = "CALL",
     [AST_TYPE_NUM] = "NUMBER",
 };
-#endif
-
-ASTTypeNum* ast_type_num_init(int val) {
-    talloc(ASTTypeNum, num);
-
-    num->val = val;
-
-    return num;
-}
-
-void ast_type_num_destroy(ASTTypeNum* num) {
-    if (!num)
-        return
-
-            free(num);
-}
-
-ASTTypeCall* ast_type_call_init(char* to, size_t argc, AST** argv) {
-    talloc(ASTTypeCall, call);
-
-    call->to = to;
-    call->argc = argc;
-    call->argv = argv;
-
-    return call;
-}
-
-void ast_type_call_destroy(ASTTypeCall* call) {
-    if (!call)
-        return
-
-            free(call->to);
-    for (size_t i = 0; i < call->argc; i++) free(call->argv[i]);
-    free(call);
-}
 
 AST* ast_init(ASTType type, void* data) {
     AST* ast = malloc(sizeof(AST));
@@ -62,3 +28,43 @@ void ast_destroy(AST* ast) {
     default:            log_dbgf("Unknown ast type %d (max: %d)", ast->type, AST_TYPE_MAX);
     }
 }
+
+void ast_print(AST* ast) {
+    log_dbgf("Tree type: %s", asttype_names[ast->type]);
+    fflush(stdout);
+}
+
+
+ASTNumData* ast_type_num_init(int val) {
+    talloc(ASTNumData, num);
+
+    num->val = val;
+
+    return num;
+}
+
+void ast_type_num_destroy(ASTNumData* num) {
+    if (!num)
+        return
+
+            free(num);
+}
+
+ASTCallData* ast_type_call_init(char* to, size_t argc, AST** argv) {
+    talloc(ASTCallData, call);
+
+    call->to = to;
+    call->argc = argc;
+    call->argv = argv;
+
+    return call;
+}
+
+void ast_type_call_destroy(ASTCallData* call) {
+    if (!call)
+        return
+
+            free(call->to);
+    for (size_t i = 0; i < call->argc; i++) free(call->argv[i]);
+    free(call);
+}

src/exec.c

@@ -5,26 +5,27 @@
 #include "include/exec.h"
 #include "include/util.h"
 
-void exec(AST* ast) {
+extern AST* root;
+
+void exec_expr() {
+    ast_print(root);
     log_dbg("Started execution.");
-    switch (ast->type) {
-    case AST_TYPE_CALL: exec_call(ast); break;
+    switch (root->type) {
+    case AST_TYPE_CALL: exec_call(); break;
     default:            printf("what\n");
     }
 }
 
-void exec_call(AST* ast) {
+void exec_call() {
     log_dbg("Started call execution.");
-    ASTTypeCall* calldata = (ASTTypeCall*)ast->data;
+    fflush(stdout);
+    ASTCallData* calldata = (ASTCallData*)root->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;
+        ASTNumData* n1 = (ASTNumData*)calldata->argv[0]->data;
+        ASTNumData* n2 = (ASTNumData*)calldata->argv[1]->data;
 
         exec_return(n1->val + n2->val);
-        */
     }
 }
 

src/grammar.y

@@ -24,19 +24,14 @@
 %token<intval> NUM
 %token<strval> CALL
 %token PLUS
+%token NL
 %type<ast> exp
 
 %%
 
 input:
     %empty
-    | line
-    ;
-
-
-line:
-    '\n'
-    | exp '\n' { root = $1; }
+    | exp { root = $1; }
     ;
 
 exp:
@@ -44,7 +39,7 @@ exp:
     | NUM PLUS NUM {
         AST* argv[2] = {
             ast_init(AST_TYPE_NUM, ast_type_num_init($1)),
-            ast_init(AST_TYPE_NUM, ast_type_num_init($1))
+            ast_init(AST_TYPE_NUM, ast_type_num_init($3))
         };
         $$ = ast_init(AST_TYPE_CALL, ast_type_call_init("+", 2, argv));
     };

src/include/ast.h

@@ -16,21 +16,22 @@ typedef struct {
 
 AST* ast_init(ASTType type, void* data);
 void ast_destroy(AST* ast);
+void ast_print(AST* ast);
 
 typedef struct {
     int val;
-} ASTTypeNum;
+} ASTNumData;
 
-ASTTypeNum* ast_type_num_init(int val);
-void ast_type_num_destroy(ASTTypeNum* num);
+ASTNumData* ast_type_num_init(int val);
+void ast_type_num_destroy(ASTNumData* num);
 
 typedef struct {
     char* to;       // What the call's to.
     size_t argc;    // Argument count.
     AST** argv;     // Argument vector.
-} ASTTypeCall;
+} ASTCallData;
 
-ASTTypeCall* ast_type_call_init(char* to, size_t argc, AST** argv);
-void ast_type_call_destroy(ASTTypeCall* call);
+ASTCallData* ast_type_call_init(char* to, size_t argc, AST** argv);
+void ast_type_call_destroy(ASTCallData* call);
 
 #endif

src/include/exec.h

@@ -1,10 +1,8 @@
 #ifndef EXEC_H
 #define EXEC_H
 
-#include "ast.h"
-
-void exec(AST* ast);
-void exec_call(AST* ast);
+void exec_expr();
+void exec_call();
 void exec_return(int n);
 
 #endif

src/lexer.c

@@ -26,6 +26,7 @@ int yylex() {
 
     switch (c) {
     case '+': return PLUS;
+    case '\n': return NL;
     default:  return CALL;
     }
 

src/main.c

@@ -4,6 +4,7 @@
 #include "include/dstr.h"
 #include "include/lexer.h"
 #include "include/util.h"
+#include "include/exec.h"
 
 #include "../build/grammars/grammar.tab.h"
 
@@ -16,28 +17,41 @@ char* inp = NULL;
 extern int yyparse();
 
 int main(int argc, char** argv) {
+
     while (1) {
-        Dstr* cline = dstr_init(); // The current line.
+        Dstr* ln = dstr_init();
+        char c;
+
         printf("> ");
         fflush(stdout);
-        for (char cch; (cch = getc(stdin)) != '\n';) {
-            log_dbgf("cchar: %c", cch);
-            dstr_appendch(cline, cch);
-        }
-        dstr_appendch(cline, '\n');
 
-        log_dbgf("cline: %s", cline->buf);
+        // Accumulate line.
+        do {
+            c = getc(stdin);
+            switch (c) {
+            case EOF:  dstr_destroy(ln); goto lnskip;
+            case '\n': goto lnend;
 
-        if (cline->ln > 0) {
-            // I hope it's null-terminated.
-            inp = cline->buf;
-            if (yyparse() == 0) {
-                printf("Parsed successfully!\n");
-            } else {
-                printf("Parse error.\n");
+            default:   dstr_appendch(ln, c); log_dbgf("cchar: %c", c);
             }
+        } while (1);
+
+    lnend:
+
+        log_dbgf("cline: %s", ln->buf);
+
+        if (ln->ln > 0) {
+            // I hope it's null-terminated.
+            inp = ln->buf;
+            if (yyparse() == 0)
+                printf("Parsed successfully!\n");
+            else
+                printf("Parse error.\n");
+
+            exec_expr();
         }
 
-        dstr_destroy(cline);
+        dstr_destroy(ln);
     }
+lnskip:;
 }