From 4f3f4cb26d9eee09aebdd37765208943e9ef6214 Mon Sep 17 00:00:00 2001
From: "Chloe M." <chloe@aptel.org>
Date: Sun, 23 Aug 2026 06:03:49 +0000
Subject: core: parser: Add parser groundwork

Signed-off-by: Chloe M. <chloe@aptel.org>
---
 core/defconf.c |  8 ++++++++
 core/parser.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 core/parser.c

(limited to 'core')

diff --git a/core/defconf.c b/core/defconf.c
index 4444179..be55708 100644
--- a/core/defconf.c
+++ b/core/defconf.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "defconf/state.h"
+#include "defconf/parser.h"
 
 /* Globals */
 static char *config_path = NULL;
@@ -24,11 +25,18 @@ static int
 defconf_run(void)
 {
     struct defconf_state state;
+    int error;
 
     if (defconf_state_init(config_path, &state) < 0) {
         return -1;
     }
 
+    /* Begin parsing the config */
+    if ((error = parse_begin(&state)) < 0) {
+        defconf_state_destroy(&state);
+        return error;
+    }
+
     defconf_state_destroy(&state);
     return 0;
 }
diff --git a/core/parser.c b/core/parser.c
new file mode 100644
index 0000000..727d5e1
--- /dev/null
+++ b/core/parser.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+#include "defconf/parser.h"
+#include "defconf/lexer.h"
+#include "defconf/token.h"
+
+/* Symbolic token */
+#define SYMTOK(TOKSTR) \
+    "[" TOKSTR "]"
+
+/* Literal token */
+#define TOKLIT(TOKSTR)  \
+    "'" TOKSTR "'"
+
+/* Safe macro to convert token type to string */
+#define TOKSTR(TT)      \
+    ((TT) >= _TT_MAX)   \
+        ? "bad"         \
+        : toktab[(TT)]
+
+/* Token to string table */
+static const char *toktab[_TT_MAX] = {
+    [TT_NONE]       = SYMTOK("none"),
+    [TT_DEFINE]     = SYMTOK("define"),
+    [TT_TRUE]       = TOKLIT("true"),
+    [TT_FALSE]      = TOKLIT("false"),
+    [TT_INTLIT]     = SYMTOK("int"),
+    [TT_IDENT]      = SYMTOK("ident")
+};
+
+int
+parse_begin(struct defconf_state *state)
+{
+    struct token tok;
+
+    if (state == NULL) {
+        return -1;
+    }
+
+    while (lexer_scan(state, &tok) == 0) {
+        printf("got %s\n", TOKSTR(tok.type));
+    }
+
+    return 0;
+}
-- 
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