core: Add initial lexer and parser sources

Signed-off-by: Ian Moffett <ian@mirocom.org>

core/parser.c

@@ -0,0 +1,51 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "rifle/parser.h"
+#include "rifle/token.h"
+#include "rifle/trace.h"
+#include "rifle/lexer.h"
+#include "rifle/state.h"
+
+/* Symbolic token */
+#define symtok(tok) \
+    "[" tok "]"
+
+/* Quoted token */
+#define qtok(tok)   \
+    "'" tok "'"
+
+/* Convert token to string */
+#define tokstr1(tt)  \
+    toktab[(tt)]
+
+/* Convert token to string */
+#define tokstr(tok)  \
+    tokstr1((tok)->type)
+
+/*
+ * Table used to convert token constants into human
+ * readable strings
+ */
+static const char *toktab[] = {
+    [TT_NONE]   = symtok("none"),
+    [TT_PLUS]   = qtok("+"),
+    [TT_MINUS]  = qtok("-"),
+    [TT_STAR]   = qtok("*"),
+    [TT_SLASH]  = qtok("/")
+};
+
+int
+parser_parse(struct rifle_state *state)
+{
+    struct token tok;
+
+    if (state == NULL) {
+        return 0;
+    }
+
+    while (lexer_scan(state, &tok) == 0) {
+        trace_debug("got %s\n", tokstr(&tok));
+    }
+
+    return 0;
+}