296 lines
11 KiB
C++
296 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:set ts=4 sw=4 sts=4 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsUnicodeProperties.h"
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#include "nsUnicodePropertyData.cpp"
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#include "mozilla/ArrayUtils.h"
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#include "nsCharTraits.h"
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#define UNICODE_BMP_LIMIT 0x10000
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#define UNICODE_LIMIT 0x110000
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const nsCharProps2&
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GetCharProps2(uint32_t aCh)
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{
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if (aCh < UNICODE_BMP_LIMIT) {
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return sCharProp2Values[sCharProp2Pages[0][aCh >> kCharProp2CharBits]]
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[aCh & ((1 << kCharProp2CharBits) - 1)];
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}
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if (aCh < (kCharProp2MaxPlane + 1) * 0x10000) {
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return sCharProp2Values[sCharProp2Pages[sCharProp2Planes[(aCh >> 16) - 1]]
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[(aCh & 0xffff) >> kCharProp2CharBits]]
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[aCh & ((1 << kCharProp2CharBits) - 1)];
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}
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NS_NOTREACHED("Getting CharProps for codepoint outside Unicode range");
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// Default values for unassigned
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using namespace mozilla::unicode;
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static const nsCharProps2 undefined = {
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VERTICAL_ORIENTATION_R,
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XIDMOD_NOT_CHARS
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};
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return undefined;
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}
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namespace mozilla {
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namespace unicode {
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/*
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To store properties for a million Unicode codepoints compactly, we use
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a three-level array structure, with the Unicode values considered as
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three elements: Plane, Page, and Char.
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Space optimization happens because multiple Planes can refer to the same
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Page array, and multiple Pages can refer to the same Char array holding
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the actual values. In practice, most of the higher planes are empty and
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thus share the same data; and within the BMP, there are also many pages
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that repeat the same data for any given property.
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Plane is usually zero, so we skip a lookup in this case, and require
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that the Plane 0 pages are always the first set of entries in the Page
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array.
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The division of the remaining 16 bits into Page and Char fields is
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adjusted for each property (by experiment using the generation tool)
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to provide the most compact storage, depending on the distribution
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of values.
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*/
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const nsIUGenCategory::nsUGenCategory sDetailedToGeneralCategory[] = {
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/*
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* The order here corresponds to the HB_UNICODE_GENERAL_CATEGORY_* constants
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* of the hb_unicode_general_category_t enum in gfx/harfbuzz/src/hb-unicode.h.
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*/
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/* CONTROL */ nsIUGenCategory::kOther,
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/* FORMAT */ nsIUGenCategory::kOther,
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/* UNASSIGNED */ nsIUGenCategory::kOther,
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/* PRIVATE_USE */ nsIUGenCategory::kOther,
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/* SURROGATE */ nsIUGenCategory::kOther,
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/* LOWERCASE_LETTER */ nsIUGenCategory::kLetter,
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/* MODIFIER_LETTER */ nsIUGenCategory::kLetter,
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/* OTHER_LETTER */ nsIUGenCategory::kLetter,
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/* TITLECASE_LETTER */ nsIUGenCategory::kLetter,
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/* UPPERCASE_LETTER */ nsIUGenCategory::kLetter,
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/* COMBINING_MARK */ nsIUGenCategory::kMark,
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/* ENCLOSING_MARK */ nsIUGenCategory::kMark,
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/* NON_SPACING_MARK */ nsIUGenCategory::kMark,
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/* DECIMAL_NUMBER */ nsIUGenCategory::kNumber,
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/* LETTER_NUMBER */ nsIUGenCategory::kNumber,
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/* OTHER_NUMBER */ nsIUGenCategory::kNumber,
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/* CONNECT_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* DASH_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* CLOSE_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* FINAL_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* INITIAL_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* OTHER_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* OPEN_PUNCTUATION */ nsIUGenCategory::kPunctuation,
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/* CURRENCY_SYMBOL */ nsIUGenCategory::kSymbol,
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/* MODIFIER_SYMBOL */ nsIUGenCategory::kSymbol,
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/* MATH_SYMBOL */ nsIUGenCategory::kSymbol,
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/* OTHER_SYMBOL */ nsIUGenCategory::kSymbol,
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/* LINE_SEPARATOR */ nsIUGenCategory::kSeparator,
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/* PARAGRAPH_SEPARATOR */ nsIUGenCategory::kSeparator,
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/* SPACE_SEPARATOR */ nsIUGenCategory::kSeparator
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};
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const hb_unicode_general_category_t sICUtoHBcategory[U_CHAR_CATEGORY_COUNT] = {
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HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED, // U_GENERAL_OTHER_TYPES = 0,
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HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER, // U_UPPERCASE_LETTER = 1,
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HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER, // U_LOWERCASE_LETTER = 2,
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HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER, // U_TITLECASE_LETTER = 3,
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HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER, // U_MODIFIER_LETTER = 4,
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HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER, // U_OTHER_LETTER = 5,
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HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK, // U_NON_SPACING_MARK = 6,
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HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK, // U_ENCLOSING_MARK = 7,
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HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK, // U_COMBINING_SPACING_MARK = 8,
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HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER, // U_DECIMAL_DIGIT_NUMBER = 9,
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HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER, // U_LETTER_NUMBER = 10,
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HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER, // U_OTHER_NUMBER = 11,
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HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR, // U_SPACE_SEPARATOR = 12,
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HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR, // U_LINE_SEPARATOR = 13,
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HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR, // U_PARAGRAPH_SEPARATOR = 14,
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HB_UNICODE_GENERAL_CATEGORY_CONTROL, // U_CONTROL_CHAR = 15,
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HB_UNICODE_GENERAL_CATEGORY_FORMAT, // U_FORMAT_CHAR = 16,
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HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE, // U_PRIVATE_USE_CHAR = 17,
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HB_UNICODE_GENERAL_CATEGORY_SURROGATE, // U_SURROGATE = 18,
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HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION, // U_DASH_PUNCTUATION = 19,
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HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION, // U_START_PUNCTUATION = 20,
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HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION, // U_END_PUNCTUATION = 21,
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HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION, // U_CONNECTOR_PUNCTUATION = 22,
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HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION, // U_OTHER_PUNCTUATION = 23,
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HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL, // U_MATH_SYMBOL = 24,
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HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL, // U_CURRENCY_SYMBOL = 25,
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HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL, // U_MODIFIER_SYMBOL = 26,
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HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL, // U_OTHER_SYMBOL = 27,
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HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION, // U_INITIAL_PUNCTUATION = 28,
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HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION, // U_FINAL_PUNCTUATION = 29,
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};
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#define DEFINE_BMP_1PLANE_MAPPING_GET_FUNC(prefix_) \
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uint32_t Get##prefix_(uint32_t aCh) \
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{ \
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if (aCh >= UNICODE_BMP_LIMIT) { \
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return aCh; \
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} \
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auto page = s##prefix_##Pages[aCh >> k##prefix_##CharBits]; \
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auto index = aCh & ((1 << k##prefix_##CharBits) - 1); \
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uint32_t v = s##prefix_##Values[page][index]; \
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return v ? v : aCh; \
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}
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// full-width mappings only exist for BMP characters; all others are
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// returned unchanged
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DEFINE_BMP_1PLANE_MAPPING_GET_FUNC(FullWidth)
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DEFINE_BMP_1PLANE_MAPPING_GET_FUNC(FullWidthInverse)
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bool
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IsClusterExtender(uint32_t aCh, uint8_t aCategory)
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{
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return ((aCategory >= HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK &&
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aCategory <= HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) ||
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(aCh >= 0x200c && aCh <= 0x200d) || // ZWJ, ZWNJ
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(aCh >= 0xff9e && aCh <= 0xff9f)); // katakana sound marks
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}
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enum HSType {
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HST_NONE = U_HST_NOT_APPLICABLE,
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HST_L = U_HST_LEADING_JAMO,
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HST_V = U_HST_VOWEL_JAMO,
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HST_T = U_HST_TRAILING_JAMO,
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HST_LV = U_HST_LV_SYLLABLE,
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HST_LVT = U_HST_LVT_SYLLABLE
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};
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static HSType
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GetHangulSyllableType(uint32_t aCh)
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{
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return HSType(u_getIntPropertyValue(aCh, UCHAR_HANGUL_SYLLABLE_TYPE));
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}
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void
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ClusterIterator::Next()
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{
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if (AtEnd()) {
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NS_WARNING("ClusterIterator has already reached the end");
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return;
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}
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uint32_t ch = *mPos++;
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if (NS_IS_HIGH_SURROGATE(ch) && mPos < mLimit &&
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NS_IS_LOW_SURROGATE(*mPos)) {
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ch = SURROGATE_TO_UCS4(ch, *mPos++);
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} else if ((ch & ~0xff) == 0x1100 ||
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(ch >= 0xa960 && ch <= 0xa97f) ||
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(ch >= 0xac00 && ch <= 0xd7ff)) {
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// Handle conjoining Jamo that make Hangul syllables
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HSType hangulState = GetHangulSyllableType(ch);
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while (mPos < mLimit) {
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ch = *mPos;
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HSType hangulType = GetHangulSyllableType(ch);
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switch (hangulType) {
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case HST_L:
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case HST_LV:
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case HST_LVT:
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if (hangulState == HST_L) {
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hangulState = hangulType;
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mPos++;
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continue;
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}
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break;
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case HST_V:
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if ((hangulState != HST_NONE) && (hangulState != HST_T) &&
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(hangulState != HST_LVT)) {
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hangulState = hangulType;
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mPos++;
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continue;
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}
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break;
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case HST_T:
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if (hangulState != HST_NONE && hangulState != HST_L) {
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hangulState = hangulType;
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mPos++;
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continue;
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}
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break;
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default:
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break;
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}
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break;
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}
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}
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while (mPos < mLimit) {
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ch = *mPos;
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// Check for surrogate pairs; note that isolated surrogates will just
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// be treated as generic (non-cluster-extending) characters here,
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// which is fine for cluster-iterating purposes
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if (NS_IS_HIGH_SURROGATE(ch) && mPos < mLimit - 1 &&
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NS_IS_LOW_SURROGATE(*(mPos + 1))) {
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ch = SURROGATE_TO_UCS4(ch, *(mPos + 1));
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}
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if (!IsClusterExtender(ch)) {
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break;
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}
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mPos++;
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if (!IS_IN_BMP(ch)) {
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mPos++;
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}
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}
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NS_ASSERTION(mText < mPos && mPos <= mLimit,
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"ClusterIterator::Next has overshot the string!");
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}
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void
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ClusterReverseIterator::Next()
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{
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if (AtEnd()) {
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NS_WARNING("ClusterReverseIterator has already reached the end");
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return;
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}
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uint32_t ch;
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do {
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ch = *--mPos;
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if (NS_IS_LOW_SURROGATE(ch) && mPos > mLimit &&
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NS_IS_HIGH_SURROGATE(*(mPos - 1))) {
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ch = SURROGATE_TO_UCS4(*--mPos, ch);
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}
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if (!IsClusterExtender(ch)) {
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break;
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}
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} while (mPos > mLimit);
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// XXX May need to handle conjoining Jamo
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NS_ASSERTION(mPos >= mLimit,
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"ClusterReverseIterator::Next has overshot the string!");
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}
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uint32_t
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CountGraphemeClusters(const char16_t* aText, uint32_t aLength)
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{
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ClusterIterator iter(aText, aLength);
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uint32_t result = 0;
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while (!iter.AtEnd()) {
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++result;
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iter.Next();
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}
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return result;
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}
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} // end namespace unicode
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} // end namespace mozilla
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