Replace StyleRange with BreakList; update RenderText, etc.

ui/gfx/break_list_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gfx/break_list.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/base/range/range.h"
+
+namespace gfx {
+
+class BreakListTest : public testing::Test {};
+
+TEST_F(BreakListTest, SetValue) {
+  // Check the default values applied to new instances.
+  BreakList<bool> style_breaks(false);
+  EXPECT_TRUE(style_breaks.EqualsValueForTesting(false));
+  style_breaks.SetValue(true);
+  EXPECT_TRUE(style_breaks.EqualsValueForTesting(true));
+
+  // Ensure that setting values works correctly.
+  BreakList<SkColor> color_breaks(SK_ColorRED);
+  EXPECT_TRUE(color_breaks.EqualsValueForTesting(SK_ColorRED));
+  color_breaks.SetValue(SK_ColorBLACK);
+  EXPECT_TRUE(color_breaks.EqualsValueForTesting(SK_ColorBLACK));
+}
+
+TEST_F(BreakListTest, ApplyValue) {
+  BreakList<bool> breaks(false);
+  const size_t max = 99;
+  breaks.SetMax(max);
+
+  // Ensure ApplyValue is a no-op on invalid and empty ranges.
+  breaks.ApplyValue(true, ui::Range::InvalidRange());
+  EXPECT_TRUE(breaks.EqualsValueForTesting(false));
+  for (size_t i = 0; i < 3; ++i) {
+    breaks.ApplyValue(true, ui::Range(i, i));
+    EXPECT_TRUE(breaks.EqualsValueForTesting(false));
+  }
+
+  // Apply a value to a valid range, check breaks; repeating should be no-op.
+  std::vector<std::pair<size_t, bool> > expected;
+  expected.push_back(std::pair<size_t, bool>(0, false));
+  expected.push_back(std::pair<size_t, bool>(2, true));
+  expected.push_back(std::pair<size_t, bool>(3, false));
+  for (size_t i = 0; i < 2; ++i) {
+    breaks.ApplyValue(true, ui::Range(2, 3));
+    EXPECT_TRUE(breaks.EqualsForTesting(expected));
+  }
+
+  // Ensure setting a value overrides the ranged value.
+  breaks.SetValue(true);
+  EXPECT_TRUE(breaks.EqualsValueForTesting(true));
+
+  // Ensure applying a value over [0, |max|) is the same as setting a value.
+  breaks.ApplyValue(false, ui::Range(0, max));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(false));
+
+  // Ensure applying a value that is already applied has no effect.
+  breaks.ApplyValue(false, ui::Range(0, 2));
+  breaks.ApplyValue(false, ui::Range(3, 6));
+  breaks.ApplyValue(false, ui::Range(7, max));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(false));
+
+  // Ensure applying an identical neighboring value merges the ranges.
+  breaks.ApplyValue(true, ui::Range(0, 3));
+  breaks.ApplyValue(true, ui::Range(3, 6));
+  breaks.ApplyValue(true, ui::Range(6, max));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(true));
+
+  // Ensure applying a value with the same range overrides the ranged value.
+  breaks.ApplyValue(false, ui::Range(2, 3));
+  breaks.ApplyValue(true, ui::Range(2, 3));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(true));
+
+  // Ensure applying a value with a containing range overrides contained values.
+  breaks.ApplyValue(false, ui::Range(0, 1));
+  breaks.ApplyValue(false, ui::Range(2, 3));
+  breaks.ApplyValue(true, ui::Range(0, 3));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(true));
+  breaks.ApplyValue(false, ui::Range(4, 5));
+  breaks.ApplyValue(false, ui::Range(6, 7));
+  breaks.ApplyValue(false, ui::Range(8, 9));
+  breaks.ApplyValue(true, ui::Range(4, 9));
+  EXPECT_TRUE(breaks.EqualsValueForTesting(true));
+
+  // Ensure applying various overlapping values yields the intended results.
+  breaks.ApplyValue(false, ui::Range(1, 4));
+  breaks.ApplyValue(false, ui::Range(5, 8));
+  breaks.ApplyValue(true, ui::Range(0, 2));
+  breaks.ApplyValue(true, ui::Range(3, 6));
+  breaks.ApplyValue(true, ui::Range(7, max));
+  std::vector<std::pair<size_t, bool> > overlap;
+  overlap.push_back(std::pair<size_t, bool>(0, true));
+  overlap.push_back(std::pair<size_t, bool>(2, false));
+  overlap.push_back(std::pair<size_t, bool>(3, true));
+  overlap.push_back(std::pair<size_t, bool>(6, false));
+  overlap.push_back(std::pair<size_t, bool>(7, true));
+  EXPECT_TRUE(breaks.EqualsForTesting(overlap));
+}
+
+TEST_F(BreakListTest, SetMax) {
+  // Ensure values adjust to accommodate max position changes.
+  BreakList<bool> breaks(false);
+  breaks.SetMax(9);
+  breaks.ApplyValue(true, ui::Range(0, 2));
+  breaks.ApplyValue(true, ui::Range(3, 6));
+  breaks.ApplyValue(true, ui::Range(7, 9));
+
+  std::vector<std::pair<size_t, bool> > expected;
+  expected.push_back(std::pair<size_t, bool>(0, true));
+  expected.push_back(std::pair<size_t, bool>(2, false));
+  expected.push_back(std::pair<size_t, bool>(3, true));
+  expected.push_back(std::pair<size_t, bool>(6, false));
+  expected.push_back(std::pair<size_t, bool>(7, true));
+  EXPECT_TRUE(breaks.EqualsForTesting(expected));
+
+  // Setting a smaller max should remove any corresponding breaks.
+  breaks.SetMax(7);
+  expected.resize(4);
+  EXPECT_TRUE(breaks.EqualsForTesting(expected));
+  breaks.SetMax(4);
+  expected.resize(3);
+  EXPECT_TRUE(breaks.EqualsForTesting(expected));
+  breaks.SetMax(4);
+  EXPECT_TRUE(breaks.EqualsForTesting(expected));
+
+  // Setting a larger max should not change any breaks.
+  breaks.SetMax(50);
+  EXPECT_TRUE(breaks.EqualsForTesting(expected));
+}
+
+TEST_F(BreakListTest, GetBreakAndRange) {
+  BreakList<bool> breaks(false);
+  breaks.SetMax(8);
+  breaks.ApplyValue(true, ui::Range(1, 2));
+  breaks.ApplyValue(true, ui::Range(4, 6));
+
+  struct {
+    size_t position;
+    size_t break_index;
+    ui::Range range;
+  } cases[] = {
+    { 0, 0, ui::Range(0, 1) },
+    { 1, 1, ui::Range(1, 2) },
+    { 2, 2, ui::Range(2, 4) },
+    { 3, 2, ui::Range(2, 4) },
+    { 4, 3, ui::Range(4, 6) },
+    { 5, 3, ui::Range(4, 6) },
+    { 6, 4, ui::Range(6, 8) },
+    { 7, 4, ui::Range(6, 8) },
+    // Positions at or beyond the max simply return the last break and range.
+    { 8, 4, ui::Range(6, 8) },
+    { 9, 4, ui::Range(6, 8) },
+  };
+
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
+    BreakList<bool>::const_iterator it = breaks.GetBreak(cases[i].position);
+    EXPECT_EQ(breaks.breaks()[cases[i].break_index], *it);
+    EXPECT_EQ(breaks.GetRange(it), cases[i].range);
+  }
+}
+
+}  // namespace gfx