schema: adds PNode and its exact variants

This patch introduces PNode alternative to SNode, which allows to
traverse parsed module tree including groupings, uses and other special
nodes.

Closes: #102
Signed-off-by: Stefan Gula <steweg@gmail.com>
Signed-off-by: Samuel Gauthier <samuel.gauthier@6wind.com>

Author: steweg

cffi/cdefs.h

@@ -528,6 +528,25 @@ typedef enum {
 
 char* lysc_path(const struct lysc_node *, LYSC_PATH_TYPE, char *, size_t);
 
+struct lysp_when {
+    const char *cond;
+    ...;
+};
+
+struct lysp_refine {
+    const char *nodeid;
+    const char *dsc;
+    const char *ref;
+    struct lysp_qname *iffeatures;
+    struct lysp_restr *musts;
+    const char *presence;
+    struct lysp_qname *dflts;
+    uint32_t min;
+    uint32_t max;
+    struct lysp_ext_instance *exts;
+    uint16_t flags;
+};
+
 struct lysp_node_container {
     struct lysp_restr *musts;
     struct lysp_when *when;
@@ -615,6 +634,101 @@ struct lysp_node_list {
     ...;
 };
 
+struct lysp_node_choice {
+    struct lysp_node *child;
+    struct lysp_when *when;
+    struct lysp_qname dflt;
+    ...;
+};
+
+struct lysp_node_case {
+    struct lysp_node *child;
+    struct lysp_when *when;
+    ...;
+};
+
+struct lysp_node_anydata {
+    struct lysp_restr *musts;
+    struct lysp_when *when;
+    ...;
+};
+
+struct lysp_node_uses {
+    struct lysp_refine *refines;
+    struct lysp_node_augment *augments;
+    struct lysp_when *when;
+    ...;
+};
+
+struct lysp_node_action_inout {
+    struct lysp_restr *musts;
+    struct lysp_tpdf *typedefs;
+    struct lysp_node_grp *groupings;
+    struct lysp_node *child;
+    ...;
+};
+
+struct lysp_node_action {
+    union {
+        struct lysp_node node;
+        struct {
+            struct lysp_node_action *next;
+            ...;
+        };
+    };
+    struct lysp_tpdf *typedefs;
+    struct lysp_node_grp *groupings;
+    struct lysp_node_action_inout input;
+    struct lysp_node_action_inout output;
+    ...;
+};
+
+struct lysp_node_notif {
+    union {
+        struct lysp_node node;
+        struct {
+            struct lysp_node_notif *next;
+            ...;
+        };
+    };
+    struct lysp_restr *musts;
+    struct lysp_tpdf *typedefs;
+    struct lysp_node_grp *groupings;
+    struct lysp_node *child;
+    ...;
+};
+
+struct lysp_node_grp {
+    union {
+        struct lysp_node node;
+        struct {
+            struct lysp_node_grp *next;
+            ...;
+        };
+    };
+    struct lysp_tpdf *typedefs;
+    struct lysp_node_grp *groupings;
+    struct lysp_node *child;
+    struct lysp_node_action *actions;
+    struct lysp_node_notif *notifs;
+    ...;
+};
+
+struct lysp_node_augment {
+    union {
+        struct lysp_node node;
+        struct {
+            struct lysp_node_augment *next;
+            ...;
+        };
+    };
+    struct lysp_node *child;
+    struct lysp_when *when;
+    struct lysp_node_action *actions;
+    struct lysp_node_notif *notifs;
+    ...;
+};
+
 struct lysc_type {
     const char *name;
     struct lysc_ext_instance *exts;
@@ -623,6 +737,16 @@ struct lysc_type {
     uint32_t refcount;
 };
 
+struct lysp_type_enum {
+    const char *name;
+    const char *dsc;
+    const char *ref;
+    int64_t value;
+    struct lysp_qname *iffeatures;
+    struct lysp_ext_instance *exts;
+    uint16_t flags;
+};
+
 struct lysp_type {
     const char *name;
     struct lysp_restr *range;

libyang/__init__.py

@@ -76,6 +76,23 @@
     IfOrFeatures,
     Module,
     Must,
+    PAction,
+    PActionInOut,
+    PAnydata,
+    PAugment,
+    PCase,
+    PChoice,
+    PContainer,
+    PEnum,
+    PGrouping,
+    PLeaf,
+    PLeafList,
+    PList,
+    PNode,
+    PNotif,
+    PRefine,
+    PType,
+    PUses,
     Pattern,
     Revision,
     SAnydata,
@@ -152,6 +169,23 @@
     "NodeTypeRemoved",
     "OrderedByUserAdded",
     "OrderedByUserRemoved",
+    "PAction",
+    "PActionInOut",
+    "PAnydata",
+    "PAugment",
+    "PCase",
+    "PChoice",
+    "PContainer",
+    "PEnum",
+    "PGrouping",
+    "PLeaf",
+    "PLeafList",
+    "PList",
+    "PNode",
+    "PNotif",
+    "PRefine",
+    "PType",
+    "PUses",
     "Pattern",
     "PatternAdded",
     "PatternRemoved",