schema CHANGE move when statement from common schema node structure
The when statement is not present in many of the lysc_node* and
lysp_node* structures. It is actually similar to the must statement
which is placed in the specific schema node structures, so it make sense
to move the when statement to the same place.
Some helpers functions to access the musts and whens were added.
diff --git a/src/tree_schema_internal.h b/src/tree_schema_internal.h
index afeefac..c92269b 100644
--- a/src/tree_schema_internal.h
+++ b/src/tree_schema_internal.h
@@ -347,6 +347,38 @@
struct lysp_node **lysp_node_children_p(struct lysp_node *node);
/**
+ * @brief Get the address of the node's musts member, if any.
+ * Decides the node's type and in case it has a musts member, returns its address.
+ * @param[in] node Node to examine.
+ * @return The address of the node's musts member if any, NULL otherwise.
+ */
+struct lysp_restr **lysp_node_musts_p(const struct lysp_node *node);
+
+/**
+ * @brief Get the node's musts member, if any.
+ * Decides the node's type and in case it has a musts member, returns its address.
+ * @param[in] node Node to examine.
+ * @return The node's musts member if any, NULL otherwise.
+ */
+struct lysp_restr *lysp_node_musts(const struct lysp_node *node);
+
+/**
+ * @brief Get the address of the node's when member, if any.
+ * Decides the node's type and in case it has a when, returns it.
+ * @param[in] node Node to examine.
+ * @return The address of the node's when member if any, NULL otherwise.
+ */
+struct lysp_when **lysp_node_when_p(const struct lysp_node *node);
+
+/**
+ * @brief Get the node's when member, if any.
+ * Decides the node's type and in case it has a when, returns it.
+ * @param[in] node Node to examine.
+ * @return The node's when member if any, NULL otherwise.
+ */
+struct lysp_when *lysp_node_when(const struct lysp_node *node);
+
+/**
* @brief Get address of a node's child pointer if any.
*
* Decides the node's type and in case it has a children list, returns its address.
@@ -375,6 +407,24 @@
struct lysc_node_action **lysc_node_actions_p(struct lysc_node *node);
/**
+ * @brief Get address of a node's when member if any.
+ *
+ * Decides the node's type and in case it has a when member, returns its address.
+ * @param[in] node Node to check.
+ * @return Address of the node's when member if any, NULL otherwise.
+ */
+struct lysc_when ***lysc_node_when_p(const struct lysc_node *node);
+
+/**
+ * @brief Get address of a node's musts member if any.
+ *
+ * Decides the node's type and in case it has a musts member, returns its address.
+ * @param[in] node Node to check.
+ * @return Address of the node's musts member if any, NULL otherwise.
+ */
+struct lysc_must **lysc_node_musts_p(const struct lysc_node *node);
+
+/**
* @brief Iterate over the specified type of the extension instances
*
* @param[in] ext ([Sized array](@ref sizedarrays)) of extensions to explore