Optimize log print by using html format

Summary:
See facebook/yoga#453. Optimizes the node log print by generating some enum text via ```enum.py``` and moving printing to new functions to reduce boilerplate code.

Changes the log output to format the nodes in html to be able to copy paste it  into browsers for quick debugging.

Hides all default values.
Closes https://github.com/facebook/yoga/pull/479

Reviewed By: gkassabli

Differential Revision: D4802184

Pulled By: emilsjolander

fbshipit-source-id: 143bd63cbc31fb0755d711062cb4e6a448049ba3

tests/YGLoggerTest.cpp

@@ -0,0 +1,68 @@
+/**
+ * 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 <gtest/gtest.h>
+#include <yoga/Yoga.h>
+#include <stdarg.h>
+
+namespace {
+  char writeBuffer[4096];
+  int _unmanagedLogger(YGLogLevel level, const char *format, va_list args) {
+    return vsnprintf(writeBuffer + strlen(writeBuffer), sizeof(writeBuffer) - strlen(writeBuffer), format, args);
+  }
+}
+
+TEST(YogaTest, logger_default_node_should_print_no_style_info) {
+  writeBuffer[0] = '\0';
+  YGSetLogger(_unmanagedLogger);
+  const YGNodeRef root = YGNodeNew();
+  YGNodeCalculateLayout(root, YGUnitUndefined, YGUnitUndefined, YGDirectionLTR);
+  YGNodePrint(root, (YGPrintOptions)(YGPrintOptionsLayout | YGPrintOptionsChildren | YGPrintOptionsStyle));
+  YGSetLogger(NULL);
+  YGNodeFree(root);
+  
+  const char * expected = "<div layout=\"width: 0; height: 0; top: 0; left: 0;\" style=\"\" ></div>";
+  ASSERT_STREQ(expected, writeBuffer);
+}
+
+TEST(YogaTest, logger_node_with_percentage_absolute_position_and_margin) {
+  writeBuffer[0] = '\0';
+  YGSetLogger(_unmanagedLogger);
+  const YGNodeRef root = YGNodeNew();
+  YGNodeStyleSetPositionType(root, YGPositionTypeAbsolute);
+  YGNodeStyleSetWidthPercent(root, 50);
+  YGNodeStyleSetHeightPercent(root, 75);
+  YGNodeStyleSetFlex(root, 1);
+  YGNodeStyleSetMargin(root, YGEdgeRight, 10);
+  YGNodeStyleSetMarginAuto(root, YGEdgeLeft);
+  YGNodeCalculateLayout(root, YGUnitUndefined, YGUnitUndefined, YGDirectionLTR);
+  YGNodePrint(root, (YGPrintOptions)(YGPrintOptionsLayout | YGPrintOptionsChildren | YGPrintOptionsStyle));
+  YGSetLogger(NULL);
+  YGNodeFree(root);
+  
+  const char * expected = "<div layout=\"width: 0; height: 0; top: 0; left: 0;\" style=\"flex: 1; margin-left: auto; margin-right: 10px; width: 50%; height: 75%; position: absolute; \" ></div>";
+  ASSERT_STREQ(expected, writeBuffer);
+}
+
+TEST(YogaTest, logger_node_with_children_should_print_indented) {
+  writeBuffer[0] = '\0';
+  YGSetLogger(_unmanagedLogger);
+  const YGNodeRef root = YGNodeNew();
+  const YGNodeRef child0 = YGNodeNew();
+  const YGNodeRef child1 = YGNodeNew();
+  YGNodeInsertChild(root, child0, 0);
+  YGNodeInsertChild(root, child1, 1);
+  YGNodeCalculateLayout(root, YGUnitUndefined, YGUnitUndefined, YGDirectionLTR);
+  YGNodePrint(root, (YGPrintOptions)(YGPrintOptionsLayout | YGPrintOptionsChildren | YGPrintOptionsStyle));
+  YGSetLogger(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);
+}

tests/YGMeasureTest.cpp

@@ -180,7 +180,7 @@ TEST(YogaTest, dont_measure_when_min_equals_max_mixed_height_percent) {
 }
 
 #if GTEST_HAS_DEATH_TEST
-TEST(YogaTest, cannot_add_child_to_node_with_measure_func) {
+TEST(YogaDeathTest, cannot_add_child_to_node_with_measure_func) {
   const YGNodeRef root = YGNodeNew();
   YGNodeSetMeasureFunc(root, _measure);
 
@@ -190,7 +190,7 @@ TEST(YogaTest, cannot_add_child_to_node_with_measure_func) {
   YGNodeFreeRecursive(root);
 }
 
-TEST(YogaTest, cannot_add_nonnull_measure_func_to_non_leaf_node) {
+TEST(YogaDeathTest, cannot_add_nonnull_measure_func_to_non_leaf_node) {
   const YGNodeRef root = YGNodeNew();
   const YGNodeRef root_child0 = YGNodeNew();
   YGNodeInsertChild(root, root_child0, 0);
@@ -199,6 +199,8 @@ TEST(YogaTest, cannot_add_nonnull_measure_func_to_non_leaf_node) {
   YGNodeFreeRecursive(root);
 }
 
+#endif
+
 TEST(YogaTest, can_nullify_measure_func_on_any_node) {
   const YGNodeRef root = YGNodeNew();
   YGNodeInsertChild(root, YGNodeNew(), 0);
@@ -208,4 +210,3 @@ TEST(YogaTest, can_nullify_measure_func_on_any_node) {
   YGNodeFreeRecursive(root);
 }
 
-#endif

tests/YGMemoryFuncTest.cpp

@@ -63,7 +63,7 @@ TEST(YogaTest, memory_func_test_funcs) {
 }
 
 #if GTEST_HAS_DEATH_TEST
-TEST(YogaTest, memory_func_assert_zero_nodes) {
+TEST(YogaDeathTest, memory_func_assert_zero_nodes) {
   gNodeInstanceCount = 0; // Reset YGNode instance count for memory func test
   const YGNodeRef root = YGNodeNew();
   ASSERT_DEATH(YGSetMemoryFuncs(&testMalloc, &testCalloc, &testRealloc, &testFree),
@@ -71,7 +71,7 @@ TEST(YogaTest, memory_func_assert_zero_nodes) {
   YGNodeFreeRecursive(root);
 }
 
-TEST(YogaTest, memory_func_assert_all_non_null) {
+TEST(YogaDeathTest, memory_func_assert_all_non_null) {
   gNodeInstanceCount = 0; // Reset YGNode instance count for memory func test
   ASSERT_DEATH(YGSetMemoryFuncs(NULL, &testCalloc, &testRealloc, &testFree),
                "Cannot set memory functions: functions must be all NULL or Non-NULL");