Import new C source of truth css-layout

fbshipit-source-id: e866918d6c62fc1cf3a04c269f782b94db9b875a

CSSLayout/CSSNodeList.c

@@ -0,0 +1,86 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "CSSNodeList.h"
+
+struct CSSNodeList {
+  int capacity;
+  int count;
+  void **items;
+};
+
+CSSNodeListRef CSSNodeListNew(unsigned int initialCapacity) {
+  CSSNodeListRef list = malloc(sizeof(struct CSSNodeList));
+  assert(list != NULL);
+
+  list->capacity = initialCapacity;
+  list->count = 0;
+  list->items = malloc(sizeof(void*) * list->capacity);
+  assert(list->items != NULL);
+
+  return list;
+}
+
+void CSSNodeListFree(CSSNodeListRef list) {
+  free(list);
+}
+
+unsigned int CSSNodeListCount(CSSNodeListRef list) {
+  return list->count;
+}
+
+void CSSNodeListAdd(CSSNodeListRef list, CSSNodeRef node) {
+  CSSNodeListInsert(list, node, list->count);
+}
+
+void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, unsigned int index) {
+  if (list->count == list->capacity) {
+    list->capacity *= 2;
+    list->items = realloc(list->items, sizeof(void*) * list->capacity);
+    assert(list->items != NULL);
+  }
+
+  for (unsigned int i = list->count; i > index; i--) {
+    list->items[i] = list->items[i - 1];
+  }
+
+  list->count++;
+  list->items[index] = node;
+}
+
+CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, unsigned int index) {
+  CSSNodeRef removed = list->items[index];
+  list->items[index] = NULL;
+
+  for (unsigned int i = index; i < list->count - 1; i++) {
+    list->items[i] = list->items[i + 1];
+    list->items[i + 1] = NULL;
+  }
+
+  list->count--;
+  return removed;
+}
+
+CSSNodeRef CSSNodeListDelete(CSSNodeListRef list, CSSNodeRef node) {
+  for (unsigned int i = 0; i < list->count; i++) {
+    if (list->items[i] == node) {
+      return CSSNodeListRemove(list, i);
+    }
+  }
+
+  return NULL;
+}
+
+CSSNodeRef CSSNodeListGet(CSSNodeListRef list, unsigned int index) {
+  return list->items[index];
+}