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authorNick Wellnhofer <wellnhofer@aevum.de>2014-11-17 18:44:35 +0100
committerJohn MacFarlane <jgm@berkeley.edu>2014-11-17 21:43:46 -0800
commitb66573cb303f9174a6b86138a7c8782eeb03b3ad (patch)
tree0938ea8a64908f840d4941a419464d1982c4f879 /src/node.c
parent6165f64406da8a4ff400f4badb5169415e26e940 (diff)
Start with unified nodes
Diffstat (limited to 'src/node.c')
-rw-r--r--src/node.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/src/node.c b/src/node.c
new file mode 100644
index 0000000..0255479
--- /dev/null
+++ b/src/node.c
@@ -0,0 +1,236 @@
+#include <stddef.h>
+
+#include "config.h"
+#include "node.h"
+
+CMARK_EXPORT cmark_node_type
+cmark_node_get_type(cmark_node *node)
+{
+ return node->type;
+}
+
+cmark_node*
+cmark_node_next(cmark_node *node)
+{
+ return node->next;
+}
+
+cmark_node*
+cmark_node_previous(cmark_node *node)
+{
+ return node->prev;
+}
+
+cmark_node*
+cmark_node_parent(cmark_node *node)
+{
+ return node->parent;
+}
+
+cmark_node*
+cmark_node_first_child(cmark_node *node)
+{
+ return node->first_child;
+}
+
+cmark_node*
+cmark_node_last_child(cmark_node *node)
+{
+ return node->last_child;
+}
+
+static inline bool
+S_is_block(cmark_node *node) {
+ return node->type >= CMARK_NODE_FIRST_BLOCK
+ && node->type <= CMARK_NODE_LAST_BLOCK;
+}
+
+static inline bool
+S_is_inline(cmark_node *node) {
+ return node->type >= CMARK_NODE_FIRST_INLINE
+ && node->type <= CMARK_NODE_LAST_INLINE;
+}
+
+static bool
+S_can_contain(cmark_node *node, cmark_node *child)
+{
+ if (child->type == CMARK_NODE_DOCUMENT) {
+ return false;
+ }
+
+ switch (node->type) {
+ case CMARK_NODE_DOCUMENT:
+ case CMARK_NODE_BQUOTE:
+ case CMARK_NODE_LIST_ITEM:
+ return S_is_block(child)
+ && child->type != CMARK_NODE_LIST_ITEM;
+
+ case CMARK_NODE_LIST:
+ return child->type == CMARK_NODE_LIST_ITEM;
+
+ case CMARK_NODE_PARAGRAPH:
+ case CMARK_NODE_ATX_HEADER:
+ case CMARK_NODE_SETEXT_HEADER:
+ case CMARK_NODE_EMPH:
+ case CMARK_NODE_STRONG:
+ case CMARK_NODE_LINK:
+ case CMARK_NODE_IMAGE:
+ case CMARK_NODE_LINK_LABEL:
+ return S_is_inline(child);
+
+ default:
+ break;
+ }
+
+ return false;
+}
+
+// Unlink a node without adjusting its next, prev, and parent pointers.
+static void
+S_node_unlink(cmark_node *node)
+{
+ if (node->prev) {
+ node->prev->next = node->next;
+ }
+ if (node->next) {
+ node->next->prev = node->prev;
+ }
+
+ // Adjust first_child and last_child of parent.
+ cmark_node *parent = node->parent;
+ if (parent) {
+ if (parent->first_child == node) {
+ parent->first_child = node->next;
+ }
+ if (parent->last_child == node) {
+ parent->last_child = node->prev;
+ }
+ }
+}
+
+void
+cmark_node_unlink(cmark_node *node) {
+ S_node_unlink(node);
+
+ node->next = NULL;
+ node->prev = NULL;
+ node->parent = NULL;
+}
+
+int
+cmark_node_insert_before(cmark_node *node, cmark_node *sibling)
+{
+ if (!S_can_contain(node->parent, sibling)) {
+ return 0;
+ }
+
+ S_node_unlink(sibling);
+
+ cmark_node *old_prev = node->prev;
+
+ // Insert 'sibling' between 'old_prev' and 'node'.
+ if (old_prev) {
+ old_prev->next = sibling;
+ }
+ sibling->prev = old_prev;
+ sibling->next = node;
+ node->prev = sibling;
+
+ // Set new parent.
+ cmark_node *parent = node->parent;
+ sibling->parent = parent;
+
+ // Adjust first_child of parent if inserted as first child.
+ if (parent && !old_prev) {
+ parent->first_child = sibling;
+ }
+
+ return 1;
+}
+
+int
+cmark_node_insert_after(cmark_node *node, cmark_node *sibling)
+{
+ if (!S_can_contain(node->parent, sibling)) {
+ return 0;
+ }
+
+ S_node_unlink(sibling);
+
+ cmark_node *old_next = node->next;
+
+ // Insert 'sibling' between 'node' and 'old_next'.
+ if (old_next) {
+ old_next->prev = sibling;
+ }
+ sibling->next = old_next;
+ sibling->prev = node;
+ node->next = sibling;
+
+ // Set new parent.
+ cmark_node *parent = node->parent;
+ sibling->parent = parent;
+
+ // Adjust last_child of parent if inserted as last child.
+ if (parent && !old_next) {
+ parent->last_child = sibling;
+ }
+
+ return 1;
+}
+
+int
+cmark_node_prepend_child(cmark_node *node, cmark_node *child)
+{
+ if (!S_can_contain(node, child)) {
+ return 0;
+ }
+
+ S_node_unlink(child);
+
+ cmark_node *old_first_child = node->first_child;
+
+ child->next = old_first_child;
+ child->prev = NULL;
+ child->parent = node;
+ node->first_child = child;
+
+ if (old_first_child) {
+ old_first_child->prev = child;
+ }
+ else {
+ // Also set last_child if node previously had no children.
+ node->last_child = child;
+ }
+
+ return 1;
+}
+
+int
+cmark_node_append_child(cmark_node *node, cmark_node *child)
+{
+ if (!S_can_contain(node, child)) {
+ return 0;
+ }
+
+ S_node_unlink(child);
+
+ cmark_node *old_last_child = node->last_child;
+
+ child->next = NULL;
+ child->prev = old_last_child;
+ child->parent = node;
+ node->last_child = child;
+
+ if (old_last_child) {
+ old_last_child->next = child;
+ }
+ else {
+ // Also set first_child if node previously had no children.
+ node->first_child = child;
+ }
+
+ return 1;
+}
+
+