pull in github css-layout into fbobjc react native

Reviewed By: @vjeux

Differential Revision: D2448929

React/Layout/Layout.h

@@ -1,5 +1,4 @@
 /**
- * @generated SignedSource<<58298c7a8815a8675e970b0347dedfed>>
  *
  * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  * !! This file is a check-in from github!                       !!
@@ -7,7 +6,8 @@
  * !! You should not modify this file directly. Instead:         !!
  * !! 1) Go to https://github.com/facebook/css-layout            !!
  * !! 2) Make a pull request and get it merged                   !!
- * !! 3) Execute ./import.sh to pull in the latest version       !!
+ * !! 3) Copy the file from github to here                       !!
+ * !!    (don't forget to keep this header)                      !!
  * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  *
  * Copyright (c) 2014, Facebook, Inc.
@@ -22,12 +22,29 @@
 #define __LAYOUT_H
 
 #include <math.h>
+#ifndef __cplusplus
 #include <stdbool.h>
+#endif
+
+// Not defined in MSVC++
+#ifndef NAN
+static const unsigned long __nan[2] = {0xffffffff, 0x7fffffff};
+#define NAN (*(const float *)__nan)
+#endif
+
 #define CSS_UNDEFINED NAN
 
+typedef enum {
+  CSS_DIRECTION_INHERIT = 0,
+  CSS_DIRECTION_LTR,
+  CSS_DIRECTION_RTL
+} css_direction_t;
+
 typedef enum {
   CSS_FLEX_DIRECTION_COLUMN = 0,
-  CSS_FLEX_DIRECTION_ROW
+  CSS_FLEX_DIRECTION_COLUMN_REVERSE,
+  CSS_FLEX_DIRECTION_ROW,
+  CSS_FLEX_DIRECTION_ROW_REVERSE
 } css_flex_direction_t;
 
 typedef enum {
@@ -65,6 +82,8 @@ typedef enum {
   CSS_TOP,
   CSS_RIGHT,
   CSS_BOTTOM,
+  CSS_START,
+  CSS_END,
   CSS_POSITION_COUNT
 } css_position_t;
 
@@ -74,8 +93,9 @@ typedef enum {
 } css_dimension_t;
 
 typedef struct {
-  float position[2];
+  float position[4];
   float dimensions[2];
+  css_direction_t direction;
 
   // Instead of recomputing the entire layout every single time, we
   // cache some information to break early when nothing changed
@@ -84,6 +104,7 @@ typedef struct {
   float last_parent_max_width;
   float last_dimensions[2];
   float last_position[2];
+  css_direction_t last_direction;
 } css_layout_t;
 
 typedef struct {
@@ -91,14 +112,16 @@ typedef struct {
 } css_dim_t;
 
 typedef struct {
+  css_direction_t direction;
   css_flex_direction_t flex_direction;
   css_justify_t justify_content;
+  css_align_t align_content;
   css_align_t align_items;
   css_align_t align_self;
   css_position_type_t position_type;
   css_wrap_type_t flex_wrap;
   float flex;
-  float margin[4];
+  float margin[6];
   float position[4];
   /**
    * You should skip all the rules that contain negative values for the
@@ -110,22 +133,29 @@ typedef struct {
    *   {left: -5 ...}
    *   {left: 0 ...}
    */
-  float padding[4];
-  float border[4];
+  float padding[6];
+  float border[6];
   float dimensions[2];
+  float minDimensions[2];
+  float maxDimensions[2];
 } css_style_t;
 
-typedef struct css_node {
+typedef struct css_node css_node_t;
+struct css_node {
   css_style_t style;
   css_layout_t layout;
   int children_count;
+  int line_index;
+
+  css_node_t* next_absolute_child;
+  css_node_t* next_flex_child;
 
   css_dim_t (*measure)(void *context, float width);
   void (*print)(void *context);
   struct css_node* (*get_child)(void *context, int i);
   bool (*is_dirty)(void *context);
   void *context;
-} css_node_t;
+};
 
 
 // Lifecycle of nodes and children
@@ -142,7 +172,7 @@ typedef enum {
 void print_css_node(css_node_t *node, css_print_options_t options);
 
 // Function that computes the layout!
-void layoutNode(css_node_t *node, float maxWidth);
+void layoutNode(css_node_t *node, float maxWidth, css_direction_t parentDirection);
 bool isUndefined(float value);
 
 #endif

React/Views/RCTShadowView.m

@@ -219,7 +219,7 @@ static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float st
                 parentConstraint:(__unused CGSize)parentConstraint
 {
   [self fillCSSNode:_cssNode];
-  layoutNode(_cssNode, CSS_UNDEFINED);
+  layoutNode(_cssNode, CSS_UNDEFINED, CSS_DIRECTION_INHERIT);
   [self applyLayoutNode:_cssNode viewsWithNewFrame:viewsWithNewFrame absolutePosition:CGPointZero];
 }