X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=libecoli%2Fecoli_node_expr.h;fp=libecoli%2Fecoli_node_expr.h;h=4f21d81128fab91563b6e1f91a44149137577489;hb=90efcb0b905753a2eac864bc1a869781d7c31919;hp=0000000000000000000000000000000000000000;hpb=dec2d7fa17ae1e8b3d1dec8e396d057757baf4f3;p=protos%2Flibecoli.git

diff --git a/libecoli/ecoli_node_expr.h b/libecoli/ecoli_node_expr.h
new file mode 100644
index 0000000..4f21d81
--- /dev/null
+++ b/libecoli/ecoli_node_expr.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2016, Olivier MATZ <zer0@droids-corp.org>
+ */
+
+#ifndef ECOLI_NODE_EXPR_
+#define ECOLI_NODE_EXPR_
+
+#include <ecoli_node.h>
+
+/**
+ * Callback function type for evaluating a variable
+ *
+ * @param result
+ *   On success, this pointer must be set by the user to point
+ *   to a user structure describing the evaluated result.
+ * @param userctx
+ *   A user-defined context passed to all callback functions, which
+ *   can be used to maintain a state or store global information.
+ * @param var
+ *   The parse result referencing the variable.
+ * @return
+ *   0 on success (*result must be set), or -errno on error (*result
+ *   is undefined).
+ */
+typedef int (*ec_node_expr_eval_var_t)(
+	void **result, void *userctx,
+	const struct ec_parse *var);
+
+/**
+ * Callback function type for evaluating a prefix-operator
+ *
+ * @param result
+ *   On success, this pointer must be set by the user to point
+ *   to a user structure describing the evaluated result.
+ * @param userctx
+ *   A user-defined context passed to all callback functions, which
+ *   can be used to maintain a state or store global information.
+ * @param operand
+ *   The evaluated expression on which the operation should be applied.
+ * @param var
+ *   The parse result referencing the operator.
+ * @return
+ *   0 on success (*result must be set, operand is freed),
+ *   or -errno on error (*result is undefined, operand is not freed).
+ */
+typedef int (*ec_node_expr_eval_pre_op_t)(
+	void **result, void *userctx,
+	void *operand,
+	const struct ec_parse *operator);
+
+typedef int (*ec_node_expr_eval_post_op_t)(
+	void **result, void *userctx,
+	void *operand,
+	const struct ec_parse *operator);
+
+typedef int (*ec_node_expr_eval_bin_op_t)(
+	void **result, void *userctx,
+	void *operand1,
+	const struct ec_parse *operator,
+	void *operand2);
+
+typedef int (*ec_node_expr_eval_parenthesis_t)(
+	void **result, void *userctx,
+	const struct ec_parse *open_paren,
+	const struct ec_parse *close_paren,
+	void * value);
+
+typedef void (*ec_node_expr_eval_free_t)(
+	void *result, void *userctx);
+
+
+struct ec_node *ec_node_expr(const char *id);
+int ec_node_expr_set_val_node(struct ec_node *gen_node, struct ec_node *val_node);
+int ec_node_expr_add_bin_op(struct ec_node *gen_node, struct ec_node *op);
+int ec_node_expr_add_pre_op(struct ec_node *gen_node, struct ec_node *op);
+int ec_node_expr_add_post_op(struct ec_node *gen_node, struct ec_node *op);
+int ec_node_expr_add_parenthesis(struct ec_node *gen_node,
+	struct ec_node *open, struct ec_node *close);
+
+struct ec_node_expr_eval_ops {
+	ec_node_expr_eval_var_t eval_var;
+	ec_node_expr_eval_pre_op_t eval_pre_op;
+	ec_node_expr_eval_post_op_t eval_post_op;
+	ec_node_expr_eval_bin_op_t eval_bin_op;
+	ec_node_expr_eval_parenthesis_t eval_parenthesis;
+	ec_node_expr_eval_free_t eval_free;
+};
+
+int ec_node_expr_eval(void **result, const struct ec_node *node,
+	struct ec_parse *parse, const struct ec_node_expr_eval_ops *ops,
+	void *userctx);
+
+#endif