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390 lines
13 KiB
C++
390 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 nsCharProps1&
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GetCharProps1(uint32_t aCh)
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{
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if (aCh < UNICODE_BMP_LIMIT) {
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return sCharProp1Values[sCharProp1Pages[0][aCh >> kCharProp1CharBits]]
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[aCh & ((1 << kCharProp1CharBits) - 1)];
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}
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if (aCh < (kCharProp1MaxPlane + 1) * 0x10000) {
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return sCharProp1Values[sCharProp1Pages[sCharProp1Planes[(aCh >> 16) - 1]]
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[(aCh & 0xffff) >> kCharProp1CharBits]]
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[aCh & ((1 << kCharProp1CharBits) - 1)];
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}
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// Default values for unassigned
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static const nsCharProps1 undefined = {
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0, // Index to mirrored char offsets
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0, // Hangul Syllable type
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0 // Combining class
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};
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return undefined;
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}
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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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static const nsCharProps2 undefined = {
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MOZ_SCRIPT_UNKNOWN, // Script code
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0, // East Asian Width
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HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED, // General Category
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eCharType_LeftToRight, // Bidi Category
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mozilla::unicode::XIDMOD_NOT_CHARS, // Xidmod
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-1, // Numeric Value
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mozilla::unicode::HVT_NotHan // Han variant
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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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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-common.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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uint32_t
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GetMirroredChar(uint32_t aCh)
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{
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return aCh + sMirrorOffsets[GetCharProps1(aCh).mMirrorOffsetIndex];
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}
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uint32_t
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GetScriptTagForCode(int32_t aScriptCode)
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{
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// this will safely return 0 for negative script codes, too :)
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if (uint32_t(aScriptCode) > ArrayLength(sScriptCodeToTag)) {
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return 0;
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}
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return sScriptCodeToTag[aScriptCode];
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}
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static inline uint32_t
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GetCaseMapValue(uint32_t aCh)
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{
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if (aCh < UNICODE_BMP_LIMIT) {
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return sCaseMapValues[sCaseMapPages[0][aCh >> kCaseMapCharBits]]
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[aCh & ((1 << kCaseMapCharBits) - 1)];
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}
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if (aCh < (kCaseMapMaxPlane + 1) * 0x10000) {
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return sCaseMapValues[sCaseMapPages[sCaseMapPlanes[(aCh >> 16) - 1]]
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[(aCh & 0xffff) >> kCaseMapCharBits]]
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[aCh & ((1 << kCaseMapCharBits) - 1)];
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}
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return 0;
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}
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uint32_t
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GetUppercase(uint32_t aCh)
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{
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uint32_t mapValue = GetCaseMapValue(aCh);
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if (mapValue & (kLowerToUpper | kTitleToUpper)) {
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return aCh ^ (mapValue & kCaseMapCharMask);
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}
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if (mapValue & kLowerToTitle) {
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return GetUppercase(aCh ^ (mapValue & kCaseMapCharMask));
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}
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return aCh;
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}
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uint32_t
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GetLowercase(uint32_t aCh)
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{
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uint32_t mapValue = GetCaseMapValue(aCh);
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if (mapValue & kUpperToLower) {
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return aCh ^ (mapValue & kCaseMapCharMask);
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}
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if (mapValue & kTitleToUpper) {
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return GetLowercase(aCh ^ (mapValue & kCaseMapCharMask));
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}
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return aCh;
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}
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uint32_t
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GetTitlecaseForLower(uint32_t aCh)
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{
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uint32_t mapValue = GetCaseMapValue(aCh);
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if (mapValue & (kLowerToTitle | kLowerToUpper)) {
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return aCh ^ (mapValue & kCaseMapCharMask);
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}
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return aCh;
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}
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uint32_t
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GetTitlecaseForAll(uint32_t aCh)
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{
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uint32_t mapValue = GetCaseMapValue(aCh);
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if (mapValue & (kLowerToTitle | kLowerToUpper)) {
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return aCh ^ (mapValue & kCaseMapCharMask);
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}
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if (mapValue & kUpperToLower) {
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return GetTitlecaseForLower(aCh ^ (mapValue & kCaseMapCharMask));
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}
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return aCh;
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}
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HanVariantType
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GetHanVariant(uint32_t aCh)
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{
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// In the sHanVariantValues array, data for 4 successive characters
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// (2 bits each) is packed in to each uint8_t entry, with the value
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// for the lowest character stored in the least significant bits.
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uint8_t v = 0;
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if (aCh < UNICODE_BMP_LIMIT) {
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v = sHanVariantValues[sHanVariantPages[0][aCh >> kHanVariantCharBits]]
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[(aCh & ((1 << kHanVariantCharBits) - 1)) >> 2];
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} else if (aCh < (kHanVariantMaxPlane + 1) * 0x10000) {
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v = sHanVariantValues[sHanVariantPages[sHanVariantPlanes[(aCh >> 16) - 1]]
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[(aCh & 0xffff) >> kHanVariantCharBits]]
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[(aCh & ((1 << kHanVariantCharBits) - 1)) >> 2];
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}
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// extract the appropriate 2-bit field from the value
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return HanVariantType((v >> ((aCh & 3) * 2)) & 3);
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}
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uint32_t
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GetFullWidth(uint32_t 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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if (aCh < UNICODE_BMP_LIMIT) {
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uint32_t v =
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sFullWidthValues[sFullWidthPages[aCh >> kFullWidthCharBits]]
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[aCh & ((1 << kFullWidthCharBits) - 1)];
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if (v) {
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// return the mapped value if non-zero; else return original char
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return v;
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}
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}
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return aCh;
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}
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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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// TODO: replace this with a properties file or similar;
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// expect this to evolve as harfbuzz shaping support matures.
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//
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// The "shaping type" of each script run, as returned by this
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// function, is compared to the bits set in the
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// gfx.font_rendering.harfbuzz.scripts
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// preference to decide whether to use the harfbuzz shaper.
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//
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int32_t
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ScriptShapingType(int32_t aScriptCode)
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{
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switch (aScriptCode) {
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default:
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return SHAPING_DEFAULT; // scripts not explicitly listed here are
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// assumed to just use default shaping
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case MOZ_SCRIPT_ARABIC:
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case MOZ_SCRIPT_SYRIAC:
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case MOZ_SCRIPT_NKO:
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case MOZ_SCRIPT_MANDAIC:
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return SHAPING_ARABIC; // bidi scripts with Arabic-style shaping
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case MOZ_SCRIPT_HEBREW:
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return SHAPING_HEBREW;
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case MOZ_SCRIPT_HANGUL:
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return SHAPING_HANGUL;
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case MOZ_SCRIPT_MONGOLIAN: // to be supported by the Arabic shaper?
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return SHAPING_MONGOLIAN;
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case MOZ_SCRIPT_THAI: // no complex OT features, but MS engines like to do
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// sequence checking
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return SHAPING_THAI;
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case MOZ_SCRIPT_BENGALI:
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case MOZ_SCRIPT_DEVANAGARI:
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case MOZ_SCRIPT_GUJARATI:
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case MOZ_SCRIPT_GURMUKHI:
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case MOZ_SCRIPT_KANNADA:
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case MOZ_SCRIPT_MALAYALAM:
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case MOZ_SCRIPT_ORIYA:
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case MOZ_SCRIPT_SINHALA:
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case MOZ_SCRIPT_TAMIL:
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case MOZ_SCRIPT_TELUGU:
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case MOZ_SCRIPT_KHMER:
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case MOZ_SCRIPT_LAO:
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case MOZ_SCRIPT_TIBETAN:
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case MOZ_SCRIPT_NEW_TAI_LUE:
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case MOZ_SCRIPT_TAI_LE:
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case MOZ_SCRIPT_MYANMAR:
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case MOZ_SCRIPT_PHAGS_PA:
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case MOZ_SCRIPT_BATAK:
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case MOZ_SCRIPT_BRAHMI:
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return SHAPING_INDIC; // scripts that require Indic or other "special" shaping
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}
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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 = 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_V | HST_T)) {
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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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} // end namespace unicode
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} // end namespace mozilla
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