256 lines
9.3 KiB
C
256 lines
9.3 KiB
C
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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#ifndef ANDROID_UNICODE_H
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#define ANDROID_UNICODE_H
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#include <stdint.h>
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#include <sys/types.h>
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#define REPLACEMENT_CHAR (0xFFFD)
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// this part of code is copied from umachine.h under ICU
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/**
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* Define UChar32 as a type for single Unicode code points.
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* UChar32 is a signed 32-bit integer (same as int32_t).
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*
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* The Unicode code point range is 0..0x10ffff.
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* All other values (negative or >=0x110000) are illegal as Unicode code points.
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* They may be used as sentinel values to indicate "done", "error"
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* or similar non-code point conditions.
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*
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* @stable ICU 2.4
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*/
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typedef int32_t UChar32;
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namespace android {
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class Encoding;
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/**
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* \class Unicode
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*
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* Helper class for getting properties of Unicode characters. Characters
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* can have one of the types listed in CharType and each character can have the
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* directionality of Direction.
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*/
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class Unicode
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{
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public:
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/**
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* Directions specified in the Unicode standard. These directions map directly
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* to java.lang.Character.
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*/
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enum Direction {
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DIRECTIONALITY_UNDEFINED = -1,
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DIRECTIONALITY_LEFT_TO_RIGHT,
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DIRECTIONALITY_RIGHT_TO_LEFT,
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DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC,
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DIRECTIONALITY_EUROPEAN_NUMBER,
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DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR,
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DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR,
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DIRECTIONALITY_ARABIC_NUMBER,
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DIRECTIONALITY_COMMON_NUMBER_SEPARATOR,
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DIRECTIONALITY_NONSPACING_MARK,
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DIRECTIONALITY_BOUNDARY_NEUTRAL,
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DIRECTIONALITY_PARAGRAPH_SEPARATOR,
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DIRECTIONALITY_SEGMENT_SEPARATOR,
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DIRECTIONALITY_WHITESPACE,
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DIRECTIONALITY_OTHER_NEUTRALS,
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DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING,
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DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE,
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DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING,
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DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE,
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DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
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};
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/**
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* Character types as specified in the Unicode standard. These map directly to
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* java.lang.Character.
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*/
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enum CharType {
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CHARTYPE_UNASSIGNED = 0,
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CHARTYPE_UPPERCASE_LETTER,
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CHARTYPE_LOWERCASE_LETTER,
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CHARTYPE_TITLECASE_LETTER,
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CHARTYPE_MODIFIER_LETTER,
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CHARTYPE_OTHER_LETTER,
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CHARTYPE_NON_SPACING_MARK,
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CHARTYPE_ENCLOSING_MARK,
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CHARTYPE_COMBINING_SPACING_MARK,
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CHARTYPE_DECIMAL_DIGIT_NUMBER,
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CHARTYPE_LETTER_NUMBER,
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CHARTYPE_OTHER_NUMBER,
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CHARTYPE_SPACE_SEPARATOR,
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CHARTYPE_LINE_SEPARATOR,
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CHARTYPE_PARAGRAPH_SEPARATOR,
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CHARTYPE_CONTROL,
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CHARTYPE_FORMAT,
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CHARTYPE_MISSING_VALUE_FOR_JAVA, /* This is the mysterious missing 17 value from the java constants */
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CHARTYPE_PRIVATE_USE,
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CHARTYPE_SURROGATE,
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CHARTYPE_DASH_PUNCTUATION,
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CHARTYPE_START_PUNCTUATION,
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CHARTYPE_END_PUNCTUATION,
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CHARTYPE_CONNECTOR_PUNCTUATION,
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CHARTYPE_OTHER_PUNCTUATION,
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CHARTYPE_MATH_SYMBOL,
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CHARTYPE_CURRENCY_SYMBOL,
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CHARTYPE_MODIFIER_SYMBOL,
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CHARTYPE_OTHER_SYMBOL,
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CHARTYPE_INITIAL_QUOTE_PUNCTUATION,
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CHARTYPE_FINAL_QUOTE_PUNCTUATION
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};
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/**
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* Decomposition types as described by the unicode standard. These values map to
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* the same values in uchar.h in ICU.
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*/
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enum DecompositionType {
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DECOMPOSITION_NONE = 0,
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DECOMPOSITION_CANONICAL,
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DECOMPOSITION_COMPAT,
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DECOMPOSITION_CIRCLE,
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DECOMPOSITION_FINAL,
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DECOMPOSITION_FONT,
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DECOMPOSITION_FRACTION,
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DECOMPOSITION_INITIAL,
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DECOMPOSITION_ISOLATED,
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DECOMPOSITION_MEDIAL,
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DECOMPOSITION_NARROW,
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DECOMPOSITION_NOBREAK,
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DECOMPOSITION_SMALL,
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DECOMPOSITION_SQUARE,
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DECOMPOSITION_SUB,
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DECOMPOSITION_SUPER,
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DECOMPOSITION_VERTICAL,
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DECOMPOSITION_WIDE
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};
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/**
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* Returns the packed data for java calls
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* @param c The unicode character.
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* @return The packed data for the character.
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*
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* Copied from java.lang.Character implementation:
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* 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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* F E D C B A 9 8 7 6 5 4 3 2 1 0 F E D C B A 9 8 7 6 5 4 3 2 1 0
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*
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* 31 types ---------
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* 18 directionalities ---------
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* 2 mirroreds -
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* ----------- 56 toupper diffs
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* ----------- 48 tolower diffs
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* --- 4 totitlecase diffs
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* ------------- 84 numeric values
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* --------- 24 mirror char diffs
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*/
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static uint32_t getPackedData(UChar32 c);
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/**
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* Get the Character type.
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* @param c The unicode character.
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* @return The character's type or CHARTYPE_UNASSIGNED if the character is invalid
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* or has an unassigned class.
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*/
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static CharType getType(UChar32 c);
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/**
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* Get the Character's decomposition type.
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* @param c The unicode character.
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* @return The character's decomposition type or DECOMPOSITION_NONE is there
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* is no decomposition.
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*/
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static DecompositionType getDecompositionType(UChar32 c);
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/**
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* Returns the digit value of a character or -1 if the character
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* is not within the specified radix.
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*
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* The digit value is computed for integer characters and letters
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* within the given radix. This function does not handle Roman Numerals,
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* fractions, or any other characters that may represent numbers.
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*
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* @param c The unicode character
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* @param radix The intended radix.
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* @return The digit value or -1 if there is no digit value or if the value is outside the radix.
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*/
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static int getDigitValue(UChar32 c, int radix = 10);
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/**
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* Return the numeric value of a character
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*
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* @param c The unicode character.
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* @return The numeric value of the character. -1 if the character has no numeric value,
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* -2 if the character has a numeric value that is not representable by an integer.
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*/
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static int getNumericValue(UChar32 c);
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/**
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* Convert the character to lowercase
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* @param c The unicode character.
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* @return The lowercase character equivalent of c. If c does not have a lowercase equivalent,
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* the original character is returned.
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*/
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static UChar32 toLower(UChar32 c);
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/**
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* Convert the character to uppercase
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* @param c The unicode character.
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* @return The uppercase character equivalent of c. If c does not have an uppercase equivalent,
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* the original character is returned.
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*/
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static UChar32 toUpper(UChar32 c);
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/**
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* Get the directionality of the character.
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* @param c The unicode character.
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* @return The direction of the character or DIRECTIONALITY_UNDEFINED.
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*/
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static Direction getDirectionality(UChar32 c);
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/**
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* Check if the character is a mirrored character. This means that the character
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* has an equivalent character that is the mirror image of itself.
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* @param c The unicode character.
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* @return True iff c has a mirror equivalent.
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*/
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static bool isMirrored(UChar32 c);
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/**
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* Return the mirror of the given character.
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* @param c The unicode character.
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* @return The mirror equivalent of c. If c does not have a mirror equivalent,
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* the original character is returned.
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* @see isMirrored
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*/
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static UChar32 toMirror(UChar32 c);
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/**
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* Convert the character to title case.
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* @param c The unicode character.
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* @return The titlecase equivalent of c. If c does not have a titlecase equivalent,
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* the original character is returned.
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*/
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static UChar32 toTitle(UChar32 c);
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};
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}
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#endif
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