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Diffstat (limited to 'intl/components/src/UnicodeProperties.h')
| -rw-r--r-- | intl/components/src/UnicodeProperties.h | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/intl/components/src/UnicodeProperties.h b/intl/components/src/UnicodeProperties.h new file mode 100644 index 0000000000..785bc356f8 --- /dev/null +++ b/intl/components/src/UnicodeProperties.h @@ -0,0 +1,306 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ +#ifndef intl_components_UnicodeProperties_h_ +#define intl_components_UnicodeProperties_h_ + +#include "mozilla/intl/BidiClass.h" +#include "mozilla/intl/ICU4CGlue.h" +#include "mozilla/intl/UnicodeScriptCodes.h" +#include "mozilla/Vector.h" + +#include "unicode/uchar.h" +#include "unicode/uscript.h" + +namespace mozilla::intl { + +/** + * This component is a Mozilla-focused API for working with text properties. + */ +class UnicodeProperties final { + public: + /** + * Return the BidiClass for the character. + */ + static inline BidiClass GetBidiClass(uint32_t aCh) { + return BidiClass(u_charDirection(aCh)); + } + + /** + * Maps the specified character to a "mirror-image" character. + */ + static inline uint32_t CharMirror(uint32_t aCh) { return u_charMirror(aCh); } + + /** + * Return the general category value for the code point. + */ + static inline uint32_t CharType(uint32_t aCh) { return u_charType(aCh); } + + /** + * Determine whether the code point has the Bidi_Mirrored property. + */ + static inline bool IsMirrored(uint32_t aCh) { return u_isMirrored(aCh); } + + /** + * Returns the combining class of the code point as specified in + * UnicodeData.txt. + */ + static inline uint8_t GetCombiningClass(uint32_t aCh) { + return u_getCombiningClass(aCh); + } + + enum class IntProperty { + BidiPairedBracketType, + EastAsianWidth, + HangulSyllableType, + LineBreak, + NumericType, + }; + + /** + * Get the property value for an enumerated or integer Unicode property for a + * code point. + */ + static inline int32_t GetIntPropertyValue(uint32_t aCh, IntProperty aProp) { + UProperty prop; + switch (aProp) { + case IntProperty::BidiPairedBracketType: + prop = UCHAR_BIDI_PAIRED_BRACKET_TYPE; + break; + case IntProperty::EastAsianWidth: + prop = UCHAR_EAST_ASIAN_WIDTH; + break; + case IntProperty::HangulSyllableType: + prop = UCHAR_HANGUL_SYLLABLE_TYPE; + break; + case IntProperty::LineBreak: + prop = UCHAR_LINE_BREAK; + break; + case IntProperty::NumericType: + prop = UCHAR_NUMERIC_TYPE; + break; + } + return u_getIntPropertyValue(aCh, prop); + } + + /** + * Get the numeric value for a Unicode code point as defined in the + * Unicode Character Database if the input is decimal or a digit, + * otherwise, returns -1. + */ + static inline int8_t GetNumericValue(uint32_t aCh) { + UNumericType type = + UNumericType(GetIntPropertyValue(aCh, IntProperty::NumericType)); + return type == U_NT_DECIMAL || type == U_NT_DIGIT + ? int8_t(u_getNumericValue(aCh)) + : -1; + } + + /** + * Maps the specified character to its paired bracket character. + */ + static inline uint32_t GetBidiPairedBracket(uint32_t aCh) { + return u_getBidiPairedBracket(aCh); + } + + /** + * The given character is mapped to its uppercase equivalent according to + * UnicodeData.txt; if the character has no uppercase equivalent, the + * character itself is returned. + */ + static inline uint32_t ToUpper(uint32_t aCh) { return u_toupper(aCh); } + + /** + * The given character is mapped to its lowercase equivalent according to + * UnicodeData.txt; if the character has no lowercase equivalent, the + * character itself is returned. + */ + static inline uint32_t ToLower(uint32_t aCh) { return u_tolower(aCh); } + + /** + * Check if a code point has the Lowercase Unicode property. + */ + static inline bool IsLowercase(uint32_t aCh) { return u_isULowercase(aCh); } + + /** + * The given character is mapped to its titlecase equivalent according to + * UnicodeData.txt; if the character has no titlecase equivalent, the + * character itself is returned. + */ + static inline uint32_t ToTitle(uint32_t aCh) { return u_totitle(aCh); } + + /** + * The given character is mapped to its case folding equivalent according to + * UnicodeData.txt and CaseFolding.txt; + * if the character has no case folding equivalent, the character + * itself is returned. + */ + static inline uint32_t FoldCase(uint32_t aCh) { + return u_foldCase(aCh, U_FOLD_CASE_DEFAULT); + } + + enum class BinaryProperty { + DefaultIgnorableCodePoint, + Emoji, + EmojiPresentation, + }; + + /** + * Check a binary Unicode property for a code point. + */ + static inline bool HasBinaryProperty(uint32_t aCh, BinaryProperty aProp) { + UProperty prop; + switch (aProp) { + case BinaryProperty::DefaultIgnorableCodePoint: + prop = UCHAR_DEFAULT_IGNORABLE_CODE_POINT; + break; + case BinaryProperty::Emoji: + prop = UCHAR_EMOJI; + break; + case BinaryProperty::EmojiPresentation: + prop = UCHAR_EMOJI_PRESENTATION; + break; + } + return u_hasBinaryProperty(aCh, prop); + } + + /** + * Check if the width of aCh is full width, half width or wide + * excluding emoji. + */ + static inline bool IsEastAsianWidthFHWexcludingEmoji(uint32_t aCh) { + switch (GetIntPropertyValue(aCh, IntProperty::EastAsianWidth)) { + case U_EA_FULLWIDTH: + case U_EA_HALFWIDTH: + return true; + case U_EA_WIDE: + return HasBinaryProperty(aCh, BinaryProperty::Emoji) ? false : true; + case U_EA_AMBIGUOUS: + case U_EA_NARROW: + case U_EA_NEUTRAL: + return false; + } + return false; + } + + /** + * Check if the width of aCh is ambiguous, full width, or wide. + */ + static inline bool IsEastAsianWidthAFW(uint32_t aCh) { + switch (GetIntPropertyValue(aCh, IntProperty::EastAsianWidth)) { + case U_EA_AMBIGUOUS: + case U_EA_FULLWIDTH: + case U_EA_WIDE: + return true; + case U_EA_HALFWIDTH: + case U_EA_NARROW: + case U_EA_NEUTRAL: + return false; + } + return false; + } + + /** + * Check if the width of aCh is full width, or wide. + */ + static inline bool IsEastAsianWidthFW(uint32_t aCh) { + switch (GetIntPropertyValue(aCh, IntProperty::EastAsianWidth)) { + case U_EA_FULLWIDTH: + case U_EA_WIDE: + return true; + case U_EA_AMBIGUOUS: + case U_EA_HALFWIDTH: + case U_EA_NARROW: + case U_EA_NEUTRAL: + return false; + } + return false; + } + + /** + * Check if the CharType of aCh is math or other symbol. + */ + static inline bool IsMathOrMusicSymbol(uint32_t aCh) { + // Keep this function in sync with is_math_symbol in base_chars.py. + return CharType(aCh) == U_MATH_SYMBOL || CharType(aCh) == U_OTHER_SYMBOL; + } + + static inline Script GetScriptCode(uint32_t aCh) { + // We can safely ignore the error code here because uscript_getScript + // returns USCRIPT_INVALID_CODE in the event of an error. + UErrorCode err = U_ZERO_ERROR; + return Script(uscript_getScript(aCh, &err)); + } + + static inline bool HasScript(uint32_t aCh, Script aScript) { + return uscript_hasScript(aCh, UScriptCode(aScript)); + } + + static inline const char* GetScriptShortName(Script aScript) { + return uscript_getShortName(UScriptCode(aScript)); + } + + static inline int32_t GetMaxNumberOfScripts() { + return u_getIntPropertyMaxValue(UCHAR_SCRIPT); + } + + // The code point which has the most script extensions is 0x0965, which has 21 + // script extensions, so choose the vector size as 32 to prevent heap + // allocation. + static constexpr size_t kMaxScripts = 32; + + using ScriptExtensionVector = Vector<Script, kMaxScripts>; + + /** + * Get the script extensions for the given code point, and write the script + * extensions to aExtensions vector. If the code point has script extensions, + * the script code (Script::COMMON or Script::INHERITED) will be excluded. + * + * If the code point doesn't have any script extension, then its script code + * will be written to aExtensions vector. + * + * If the code point is invalid, Script::UNKNOWN will be written to + * aExtensions vector. + * + * Note: aExtensions will be cleared after calling this method regardless of + * failure. + * + * See [1] for the script code of the code point, [2] for the script + * extensions. + * + * https://www.unicode.org/Public/UNIDATA/Scripts.txt + * https://www.unicode.org/Public/UNIDATA/ScriptExtensions.txt + */ + static ICUResult GetExtensions(char32_t aCodePoint, + ScriptExtensionVector& aExtensions) { + // Clear the vector first. + aExtensions.clear(); + + // We cannot pass aExtensions to uscript_getScriptExtension as USCriptCode + // takes 4 bytes, so create a local UScriptCode array to get the extensions. + UScriptCode ext[kMaxScripts]; + UErrorCode status = U_ZERO_ERROR; + int32_t len = uscript_getScriptExtensions(static_cast<UChar32>(aCodePoint), + ext, kMaxScripts, &status); + if (U_FAILURE(status)) { + // kMaxScripts should be large enough to hold the maximun number of script + // extensions. + MOZ_DIAGNOSTIC_ASSERT(status != U_BUFFER_OVERFLOW_ERROR); + return Err(ToICUError(status)); + } + + if (!aExtensions.reserve(len)) { + return Err(ICUError::OutOfMemory); + } + + for (int32_t i = 0; i < len; i++) { + aExtensions.infallibleAppend(Script(ext[i])); + } + + return Ok(); + } +}; + +} // namespace mozilla::intl + +#endif |