Expose logging capablities in Yoga header

Summary: Exposes a bool in the config which will help log the yoga hierarchy. Also added a test case

Reviewed By: IanChilds

Differential Revision: D9560577

fbshipit-source-id: ef4998107ed51ea374853bab7cbe09e3232caa0c

tests/YGLoggerTest.cpp

@@ -1,10 +1,10 @@
-/**
+/*
  *  Copyright (c) 2014-present, Facebook, Inc.
  *
- * This source code is licensed under the MIT license found in the
+ *  This source code is licensed under the MIT license found in the LICENSE
- * LICENSE file in the root directory of this source tree.
+ *  file in the root directory of this source tree.
+ *
  */
-
 #include <gtest/gtest.h>
 #include <stdarg.h>
 #include <yoga/Yoga.h>
@@ -23,6 +23,46 @@ int _unmanagedLogger(const YGConfigRef config,
 }
 }
 
+TEST(YogaTest, config_print_tree_enabled) {
+  writeBuffer[0] = '\0';
+  const YGConfigRef config = YGConfigNew();
+  YGConfigSetPrintTreeFlag(config, true);
+  YGConfigSetLogger(config, _unmanagedLogger);
+  const YGNodeRef root = YGNodeNewWithConfig(config);
+  const YGNodeRef child0 = YGNodeNewWithConfig(config);
+  const YGNodeRef child1 = YGNodeNewWithConfig(config);
+  YGNodeInsertChild(root, child0, 0);
+  YGNodeInsertChild(root, child1, 1);
+  YGNodeCalculateLayout(root, YGUnitUndefined, YGUnitUndefined, YGDirectionLTR);
+  YGConfigSetLogger(config, NULL);
+  YGNodeFreeRecursive(root);
+
+  const char* expected =
+      "<div layout=\"width: 0; height: 0; top: 0; left: 0;\" style=\"\" >\n  "
+      "<div layout=\"width: 0; height: 0; top: 0; left: 0;\" style=\"\" "
+      "></div>\n  <div layout=\"width: 0; height: 0; top: 0; left: 0;\" "
+      "style=\"\" ></div>\n</div>";
+  ASSERT_STREQ(expected, writeBuffer);
+}
+
+TEST(YogaTest, config_print_tree_disabled) {
+  writeBuffer[0] = '\0';
+  const YGConfigRef config = YGConfigNew();
+  YGConfigSetPrintTreeFlag(config, false);
+  YGConfigSetLogger(config, _unmanagedLogger);
+  const YGNodeRef root = YGNodeNewWithConfig(config);
+  const YGNodeRef child0 = YGNodeNewWithConfig(config);
+  const YGNodeRef child1 = YGNodeNewWithConfig(config);
+  YGNodeInsertChild(root, child0, 0);
+  YGNodeInsertChild(root, child1, 1);
+  YGNodeCalculateLayout(root, YGUnitUndefined, YGUnitUndefined, YGDirectionLTR);
+  YGConfigSetLogger(config, NULL);
+  YGNodeFreeRecursive(root);
+
+  const char* expected = "";
+  ASSERT_STREQ(expected, writeBuffer);
+}
+
 TEST(YogaTest, logger_default_node_should_print_no_style_info) {
   writeBuffer[0] = '\0';
   const YGConfigRef config = YGConfigNew();

yoga/YGConfig.cpp

@@ -1,10 +1,10 @@
-/**
+/*
  *  Copyright (c) 2014-present, Facebook, Inc.
  *
- * This source code is licensed under the MIT license found in the
+ *  This source code is licensed under the MIT license found in the LICENSE
- * LICENSE file in the root directory of this source tree.
+ *  file in the root directory of this source tree.
+ *
  */
-
 #include "YGConfig.h"
 
 const std::array<bool, YGExperimentalFeatureCount>
@@ -15,5 +15,8 @@ YGConfig::YGConfig(YGLogger logger)
       useWebDefaults(false),
       useLegacyStretchBehaviour(false),
       shouldDiffLayoutWithoutLegacyStretchBehaviour(false),
-      pointScaleFactor(1.0f), logger(logger), cloneNodeCallback(nullptr),
+      pointScaleFactor(1.0f),
-      context(nullptr) {}
+      logger(logger),
+      cloneNodeCallback(nullptr),
+      context(nullptr),
+      printTree(false) {}

yoga/YGConfig.h

@@ -1,10 +1,10 @@
-/**
+/*
  *  Copyright (c) 2014-present, Facebook, Inc.
  *
- * This source code is licensed under the MIT license found in the
+ *  This source code is licensed under the MIT license found in the LICENSE
- * LICENSE file in the root directory of this source tree.
+ *  file in the root directory of this source tree.
+ *
  */
-
 #pragma once
 #include "Yoga-internal.h"
 #include "Yoga.h"
@@ -18,6 +18,7 @@ struct YGConfig {
   YGLogger logger;
   YGCloneNodeFunc cloneNodeCallback;
   void* context;
+  bool printTree;
 
   YGConfig(YGLogger logger);
 };

yoga/Yoga.cpp

@@ -198,6 +198,10 @@ bool YGNodeGetHasNewLayout(YGNodeRef node) {
   return node->getHasNewLayout();
 }
 
+void YGConfigSetPrintTreeFlag(YGConfigRef config, bool enabled) {
+  config->printTree = enabled;
+}
+
 void YGNodeSetHasNewLayout(YGNodeRef node, bool hasNewLayout) {
   node->setHasNewLayout(hasNewLayout);
 }
@@ -3535,7 +3539,6 @@ static void YGNodelayoutImpl(
 }
 
 uint32_t gDepth = 0;
-bool gPrintTree = false;
 bool gPrintChanges = false;
 bool gPrintSkips = false;
 
@@ -4111,7 +4114,7 @@ void YGNodeCalculateLayout(
         node->getLayout().direction, ownerWidth, ownerHeight, ownerWidth);
     YGRoundToPixelGrid(node, node->getConfig()->pointScaleFactor, 0.0f, 0.0f);
 
-    if (gPrintTree) {
+    if (node->getConfig()->printTree) {
       YGNodePrint(
           node,
           (YGPrintOptions)(
@@ -4163,7 +4166,7 @@ void YGNodeCalculateLayout(
       node->setLayoutDoesLegacyFlagAffectsLayout(
           !originalNode->isLayoutTreeEqualToNode(*node));
 
-      if (gPrintTree) {
+      if (originalNode->getConfig()->printTree) {
         YGNodePrint(
             originalNode,
             (YGPrintOptions)(

yoga/Yoga.h

@@ -155,6 +155,7 @@ WIN_EXPORT void YGNodeCopyStyle(
 
 void* YGNodeGetContext(YGNodeRef node);
 void YGNodeSetContext(YGNodeRef node, void* context);
+void YGConfigSetPrintTreeFlag(YGConfigRef config, bool enabled);
 YGMeasureFunc YGNodeGetMeasureFunc(YGNodeRef node);
 void YGNodeSetMeasureFunc(YGNodeRef node, YGMeasureFunc measureFunc);
 YGBaselineFunc YGNodeGetBaselineFunc(YGNodeRef node);