Import new C source of truth css-layout

fbshipit-source-id: e866918d6c62fc1cf3a04c269f782b94db9b875a

tests/CSSLayoutTestUtils/CSSLayoutTestUtils.c

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+/**
+ * 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 <stdlib.h>
+
+#include "CSSLayoutTestUtils.h"
+
+#ifdef _MSC_VER
+#include <float.h>
+#define isnan _isnan
+
+/* define fmaxf & fminf if < VC12 */
+#if _MSC_VER < 1800
+__forceinline const float fmaxf(const float a, const float b) {
+  return (a > b) ? a : b;
+}
+__forceinline const float fminf(const float a, const float b) {
+  return (a < b) ? a : b;
+}
+#endif
+#endif
+
+static bool eq(float a, float b) {
+  return fabs(a - b) < 0.0001;
+}
+
+static bool are_layout_equal(CSSNode *a, CSSNode *b) {
+  if (!eq(a->layout.dimensions[CSSDimensionWidth], b->layout.dimensions[CSSDimensionWidth]) ||
+      !eq(a->layout.dimensions[CSSDimensionHeight], b->layout.dimensions[CSSDimensionHeight]) ||
+      !eq(a->layout.position[CSSPositionTop], b->layout.position[CSSPositionTop]) ||
+      !eq(a->layout.position[CSSPositionLeft], b->layout.position[CSSPositionLeft]) ||
+      !eq(CSSNodeChildCount(a), CSSNodeChildCount(b))) {
+    return false;
+  }
+  for (int i = 0; i < CSSNodeChildCount(a); ++i) {
+    if (!are_layout_equal(CSSNodeGetChild(a, i), CSSNodeGetChild(b, i))) {
+      return false;
+    }
+  }
+  return true;
+}
+
+CSSSize measure(void *context, float width, CSSMeasureMode widthMode, float height, CSSMeasureMode heightMode) {
+  const char *text = (const char *)context;
+  CSSSize result;
+  if (strcmp(text, SMALL_TEXT) == 0) {
+    if (widthMode == CSSMeasureModeUndefined) {
+      width = 1000000;
+    }
+    result.width = fminf(SMALL_WIDTH, width);
+    result.height = SMALL_WIDTH > width ? BIG_HEIGHT : SMALL_HEIGHT;
+    return result;
+  }
+  if (strcmp(text, LONG_TEXT) == 0) {
+    if (widthMode == CSSMeasureModeUndefined) {
+      width = 1000000;
+    }
+    result.width = fminf(BIG_WIDTH, width);
+    result.height = BIG_WIDTH > width ? BIG_HEIGHT : SMALL_HEIGHT;
+    return result;
+  }
+
+  if (strcmp(text, MEASURE_WITH_RATIO_2) == 0) {
+    if (widthMode == CSSMeasureModeExactly) {
+      result.width = width;
+      result.height = width * 2;
+    } else if (heightMode == CSSMeasureModeExactly) {
+      result.width = height * 2;
+      result.height = height;
+    } else if (widthMode == CSSMeasureModeAtMost) {
+      result.width = width;
+      result.height = width * 2;
+    } else if (heightMode == CSSMeasureModeAtMost) {
+      result.width = height * 2;
+      result.height = height;
+    } else {
+      result.width = 99999;
+      result.height = 99999;
+    }
+    return result;
+  }
+
+  if (strcmp(text, MEASURE_WITH_MATCH_PARENT) == 0) {
+    if (widthMode == CSSMeasureModeUndefined) {
+      width = 99999;
+    }
+    if (heightMode == CSSMeasureModeUndefined) {
+      height = 99999;
+    }
+    result.width = width;
+    result.height = height;
+    return result;
+  }
+
+  // Should not go here
+  result.width = CSSUndefined;
+  result.height = CSSUndefined;
+  return result;
+}
+
+bool test(CSSNode *style, CSSNode *expected_layout) {
+  CSSNodeCalculateLayout(style, CSSUndefined, CSSUndefined, (CSSDirection)-1);
+  return are_layout_equal(style, expected_layout);
+}
+
+CSSNode *new_test_css_node(void) {
+  CSSNode *node = CSSNodeNew();
+  return node;
+}
+
+void init_css_node_children(CSSNode *node, int childCount) {
+  for (int i = 0; i < childCount; ++i) {
+    CSSNodeInsertChild(node, new_test_css_node(), 0);
+  }
+}

tests/CSSLayoutTestUtils/CSSLayoutTestUtils.h

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+/**
+ * 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.
+ */
+
+#ifndef __CSS_LAYOUT_TEST_UTILS_H
+#define __CSS_LAYOUT_TEST_UTILS_H
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+#include <CSSLayout/CSSMacros.h>
+#include <CSSLayout/CSSLayout-internal.h>
+#include <CSSLayout/CSSNodeList.h>
+
+#define SMALL_WIDTH 35
+#define SMALL_HEIGHT 18
+#define BIG_WIDTH 172
+#define BIG_HEIGHT 36
+#define SMALL_TEXT "small"
+#define LONG_TEXT "loooooooooong with space"
+#define MEASURE_WITH_RATIO_2 "measureWithRatio2"
+#define MEASURE_WITH_MATCH_PARENT "measureWithMatchParent"
+
+CSS_EXTERN_C_BEGIN
+
+bool test(CSSNode *style, CSSNode *expected_layout);
+CSSSize measure(void *context, float width, CSSMeasureMode widthMode, float height, CSSMeasureMode heightMode);
+void init_css_node_children(CSSNode *node, int childCount);
+CSSNode *new_test_css_node(void);
+
+CSS_EXTERN_C_END
+
+#endif