![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/parser/parser.c b/src/parser/parser.c
--- /dev/null
+++ b/src/parser/parser.c
@@ -0,0 +1,185 @@
+/*
+ * SysDB - src/parser/parser.c
+ * Copyright (C) 2013-2015 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sysdb.h"
+
+#include "core/store.h"
+
+#include "parser/ast.h"
+#include "parser/parser.h"
+#include "parser/grammar.h"
+
+#include "utils/llist.h"
+#include "utils/strbuf.h"
+
+#include <assert.h>
+#include <string.h>
+
+/*
+ * private helper functions
+ */
+
+static int
+scanner_init(const char *input, int len,
+ sdb_parser_yyscan_t *scanner, sdb_parser_yyextra_t *extra,
+ sdb_strbuf_t *errbuf)
+{
+ if (! input) {
+ sdb_strbuf_sprintf(errbuf, "Missing scanner input");
+ return -1;
+ }
+
+ memset(extra, 0, sizeof(*extra));
+ extra->parsetree = sdb_llist_create();
+ extra->mode = SDB_PARSE_DEFAULT;
+ extra->errbuf = errbuf;
+
+ if (! extra->parsetree) {
+ sdb_strbuf_sprintf(errbuf, "Failed to allocate parse-tree");
+ return -1;
+ }
+
+ *scanner = sdb_parser_scanner_init(input, len, extra);
+ if (! *scanner) {
+ sdb_llist_destroy(extra->parsetree);
+ return -1;
+ }
+ return 0;
+} /* scanner_init */
+
+/*
+ * public API
+ */
+
+sdb_llist_t *
+sdb_parser_parse(const char *query, int len, sdb_strbuf_t *errbuf)
+{
+ sdb_parser_yyscan_t scanner;
+ sdb_parser_yyextra_t yyextra;
+ sdb_llist_iter_t *iter;
+ int yyres;
+
+ if (scanner_init(query, len, &scanner, &yyextra, errbuf))
+ return NULL;
+
+ yyres = sdb_parser_yyparse(scanner);
+ sdb_parser_scanner_destroy(scanner);
+
+ if (yyres) {
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+
+ iter = sdb_llist_get_iter(yyextra.parsetree);
+ while (sdb_llist_iter_has_next(iter)) {
+ sdb_conn_node_t *node;
+ node = SDB_CONN_NODE(sdb_llist_iter_get_next(iter));
+ assert(node);
+ /* TODO
+ if (sdb_parser_analyze(node, errbuf)) {
+ sdb_llist_iter_destroy(iter);
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+ */
+ }
+ sdb_llist_iter_destroy(iter);
+ return yyextra.parsetree;
+} /* sdb_parser_parse */
+
+sdb_ast_node_t *
+sdb_parser_parse_conditional(const char *cond, int len, sdb_strbuf_t *errbuf)
+{
+ sdb_parser_yyscan_t scanner;
+ sdb_parser_yyextra_t yyextra;
+
+ sdb_ast_node_t *node;
+
+ int yyres;
+
+ if (scanner_init(cond, len, &scanner, &yyextra, errbuf))
+ return NULL;
+
+ yyextra.mode = SDB_PARSE_COND;
+
+ yyres = sdb_parser_yyparse(scanner);
+ sdb_parser_scanner_destroy(scanner);
+
+ if (yyres) {
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+
+ node = SDB_AST_NODE(sdb_llist_get(yyextra.parsetree, 0));
+ if (! node) {
+ sdb_strbuf_sprintf(errbuf, "Empty conditional expression '%s'", cond);
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+
+ assert(SDB_AST_IS_LOGICAL(node));
+ sdb_llist_destroy(yyextra.parsetree);
+ return node;
+} /* sdb_parser_parse_conditional */
+
+sdb_ast_node_t *
+sdb_parser_parse_arith(const char *expr, int len, sdb_strbuf_t *errbuf)
+{
+ sdb_parser_yyscan_t scanner;
+ sdb_parser_yyextra_t yyextra;
+
+ sdb_ast_node_t *node;
+
+ int yyres;
+
+ if (scanner_init(expr, len, &scanner, &yyextra, errbuf))
+ return NULL;
+
+ yyextra.mode = SDB_PARSE_ARITH;
+
+ yyres = sdb_parser_yyparse(scanner);
+ sdb_parser_scanner_destroy(scanner);
+
+ if (yyres) {
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+
+ node = SDB_AST_NODE(sdb_llist_get(yyextra.parsetree, 0));
+ if (! node) {
+ sdb_strbuf_sprintf(errbuf, "Empty expression '%s'", expr);
+ sdb_llist_destroy(yyextra.parsetree);
+ return NULL;
+ }
+
+ assert(SDB_AST_IS_ARITHMETIC(node));
+ sdb_llist_destroy(yyextra.parsetree);
+ return node;
+} /* sdb_parser_parse_arith */
+
+/* vim: set tw=78 sw=4 ts=4 noexpandtab : */
+