core: parser: Add initial preprocessing stubs

Signed-off-by: Chloe M. <chloe@mirocom.org>

core/parser.c

@@ -58,6 +58,35 @@ static const char *toktab[] = {
     [TT_U64]     = qtok("u64")
 };
 
+/*
+ * Push a token to the token buffer in the preprocessing stage
+ *
+ * @tokbuf: Token buffer to push to
+ * @tok:    Token to push
+ *
+ * Returns zero on success
+ */
+static int
+preprocessor_push(struct tokbuf *tokbuf, struct token *tok)
+{
+    if (tokbuf == NULL || tok == NULL) {
+        return -1;
+    }
+
+    switch (tok->type) {
+    case TT_IFNDEF:
+    case TT_IFDEF:
+    case TT_DEFINE:
+        break;
+    default:
+        if (tokbuf_push(tokbuf, tok) < 0) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
 static int
 parser_nom(struct cescal_state *state, struct token *res)
 {
@@ -68,12 +97,24 @@ parser_nom(struct cescal_state *state, struct token *res)
         return -1;
     }
 
-    if (lexer_nom(state, &tok) < 0) {
-        return -1;
-    }
+    switch (state->pass) {
+    case 0:     /* Pre-processor */
+        if (lexer_nom(state, &tok) < 0) {
+            return -1;
+        }
 
-    if (tokbuf_push(&state->tokbuf, &tok) < 0) {
-        return -1;
+        printf("* %s\n", tokstr(&tok));
+        if (preprocessor_push(&state->tokbuf, &tok) < 0) {
+            return -1;
+        }
+
+        break;
+    case 1:     /* Parse */
+        if (tokbuf_pop(&state->tokbuf, &tok) < 0) {
+            return -1;
+        }
+
+        break;
     }
 
     *res = tok;
@@ -94,5 +135,6 @@ parser_parse(struct cescal_state *state)
         cc_trace("got token %s\n", tokstr(&tok));
     }
 
+    ++state->pass;
     return 0;
 }