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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_HYPHENATION_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_HYPHENATION_H_
#include "base/gtest_prod_util.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode.h"
#include "third_party/blink/renderer/platform/wtf/wtf_size_t.h"
namespace blink {
class PLATFORM_EXPORT Hyphenation : public RefCounted<Hyphenation> {
public:
virtual ~Hyphenation() = default;
// Find the last hyphenation location before |before_index|.
// Returns 0 if no hyphenation locations were found.
virtual wtf_size_t LastHyphenLocation(const StringView&,
wtf_size_t before_index) const = 0;
// Find the first hyphenation location after |after_index|.
// Returns 0 if no hyphenation locations were found.
virtual wtf_size_t FirstHyphenLocation(const StringView&,
wtf_size_t after_index) const;
// Find all hyphenation locations in the reverse order.
virtual Vector<wtf_size_t, 8> HyphenLocations(const StringView&) const;
// The minimum number of characters in the word / before the hyphen / after
// the hyphen. `0` means that the UA chooses a value.
wtf_size_t MinPrefixLength() const { return min_prefix_length_; }
wtf_size_t MinSuffixLength() const { return min_suffix_length_; }
wtf_size_t MinWordLength() const { return min_word_length_; }
void SetLimits(wtf_size_t min_prefix_length,
wtf_size_t min_suffix_length,
wtf_size_t min_word_length);
void ResetLimits() { SetLimits(0, 0, 0); }
protected:
void Initialize(const AtomicString& locale);
bool ShouldHyphenateWord(const StringView& word) const {
DCHECK_GE(MinWordLength(), 1u);
if (word.length() < MinWordLength())
return false;
// Avoid hyphenating capitalized words.
return hyphenate_capitalized_word_ || !WTF::unicode::IsUpper(word[0]);
}
private:
friend class LayoutLocale;
FRIEND_TEST_ALL_PREFIXES(HyphenationTest, SetLimits);
static scoped_refptr<Hyphenation> PlatformGetHyphenation(
const AtomicString& locale);
// The default values suggested by the spec:
// https://drafts.csswg.org/css-text-4/#propdef-hyphenate-limit-chars
static constexpr unsigned kDefaultMinPrefixLength = 2;
static constexpr unsigned kDefaultMinSuffixLength = 2;
static constexpr unsigned kDefaultMinWordLength = 5;
static_assert(kDefaultMinWordLength >=
kDefaultMinPrefixLength + kDefaultMinSuffixLength);
wtf_size_t min_word_length_ = kDefaultMinWordLength;
wtf_size_t min_prefix_length_ = kDefaultMinPrefixLength;
wtf_size_t min_suffix_length_ = kDefaultMinSuffixLength;
bool hyphenate_capitalized_word_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_HYPHENATION_H_
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