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expr.h

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+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2005 Timo Hirvonen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CMUS_EXPR_H
+#define CMUS_EXPR_H
+
+#include "track_info.h"
+#include "list.h"
+
+enum { OP_LT, OP_LE, OP_EQ, OP_GE, OP_GT, OP_NE };
+#define NR_OPS (OP_NE + 1)
+
+enum expr_type {
+	EXPR_AND,
+	EXPR_OR,
+
+	EXPR_NOT,
+
+	EXPR_STR,
+	EXPR_INT,
+	EXPR_ID,
+	EXPR_BOOL
+};
+#define NR_EXPRS (EXPR_BOOL + 1)
+
+struct expr {
+	struct expr *left, *right, *parent;
+	enum expr_type type;
+	char *key;
+	union {
+		struct {
+			struct list_head glob_head;
+			enum {
+				SOP_EQ = OP_EQ,
+				SOP_NE = OP_NE
+			} op;
+		} estr;
+		struct {
+			int val;
+			enum {
+				IOP_LT = OP_LT,
+				IOP_LE = OP_LE,
+				IOP_EQ = OP_EQ,
+				IOP_GE = OP_GE,
+				IOP_GT = OP_GT,
+				IOP_NE = OP_NE
+			} op;
+		} eint;
+		struct {
+			char* key;
+			enum {
+				KOP_LT = OP_LT,
+				KOP_LE = OP_LE,
+				KOP_EQ = OP_EQ,
+				KOP_GE = OP_GE,
+				KOP_GT = OP_GT,
+				KOP_NE = OP_NE
+			} op;
+		} eid;
+	};
+};
+
+struct expr *expr_parse(const char *str);
+struct expr* expr_parse_i(const char *str, const char *err_msg, int check_short);
+int expr_check_leaves(struct expr **exprp, const char *(*get_filter)(const char *name));
+int expr_op_to_bool(int res, int op);
+int expr_eval(struct expr *expr, struct track_info *ti);
+void expr_free(struct expr *expr);
+const char *expr_error(void);
+int expr_is_short(const char *str);
+
+unsigned int expr_get_match_type(struct expr *expr);
+/* "harmless" expressions will reduce filter results when adding characters at the beginning/end */
+int expr_is_harmless(const struct expr *expr);
+
+#endif