diff options
Diffstat (limited to 'base/third_party/icu/icu_utf.h')
| -rw-r--r-- | base/third_party/icu/icu_utf.h | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/base/third_party/icu/icu_utf.h b/base/third_party/icu/icu_utf.h new file mode 100644 index 0000000..050a84b --- /dev/null +++ b/base/third_party/icu/icu_utf.h @@ -0,0 +1,358 @@ +/* +******************************************************************************* +* +* Copyright (C) 1999-2004, International Business Machines +* Corporation and others. All Rights Reserved. +* +******************************************************************************* +* file name: utf.h +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 1999sep09 +* created by: Markus W. Scherer +*/ + +#ifndef BASE_THIRD_PARTY_ICU_ICU_UTF_H_ +#define BASE_THIRD_PARTY_ICU_ICU_UTF_H_ + +#include "base/basictypes.h" + +namespace base_icu { + +typedef uint32 UChar32; +typedef int8 UBool; + +// General --------------------------------------------------------------------- +// from utf.h + +/** + * This value is intended for sentinel values for APIs that + * (take or) return single code points (UChar32). + * It is outside of the Unicode code point range 0..0x10ffff. + * + * For example, a "done" or "error" value in a new API + * could be indicated with CBU_SENTINEL. + * + * ICU APIs designed before ICU 2.4 usually define service-specific "done" + * values, mostly 0xffff. + * Those may need to be distinguished from + * actual U+ffff text contents by calling functions like + * CharacterIterator::hasNext() or UnicodeString::length(). + * + * @return -1 + * @see UChar32 + * @stable ICU 2.4 + */ +#define CBU_SENTINEL (-1) + +/** + * Is this code point a Unicode noncharacter? + * @param c 32-bit code point + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU_IS_UNICODE_NONCHAR(c) \ + ((c)>=0xfdd0 && \ + ((uint32)(c)<=0xfdef || ((c)&0xfffe)==0xfffe) && \ + (uint32)(c)<=0x10ffff) + +/** + * Is c a Unicode code point value (0..U+10ffff) + * that can be assigned a character? + * + * Code points that are not characters include: + * - single surrogate code points (U+d800..U+dfff, 2048 code points) + * - the last two code points on each plane (U+__fffe and U+__ffff, 34 code points) + * - U+fdd0..U+fdef (new with Unicode 3.1, 32 code points) + * - the highest Unicode code point value is U+10ffff + * + * This means that all code points below U+d800 are character code points, + * and that boundary is tested first for performance. + * + * @param c 32-bit code point + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU_IS_UNICODE_CHAR(c) \ + ((uint32)(c)<0xd800 || \ + ((uint32)(c)>0xdfff && \ + (uint32)(c)<=0x10ffff && \ + !U_IS_UNICODE_NONCHAR(c))) + +/** + * Is this code point a surrogate (U+d800..U+dfff)? + * @param c 32-bit code point + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU_IS_SURROGATE(c) (((c)&0xfffff800)==0xd800) + +/** + * Assuming c is a surrogate code point (U_IS_SURROGATE(c)), + * is it a lead surrogate? + * @param c 32-bit code point + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU_IS_SURROGATE_LEAD(c) (((c)&0x400)==0) + + +// UTF-8 macros ---------------------------------------------------------------- +// from utf8.h + +extern const uint8 utf8_countTrailBytes[256]; + +/** + * Count the trail bytes for a UTF-8 lead byte. + * @internal + */ +#define CBU8_COUNT_TRAIL_BYTES(leadByte) (base_icu::utf8_countTrailBytes[(uint8)leadByte]) + +/** + * Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value. + * @internal + */ +#define CBU8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1) + +/** + * Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)? + * @param c 8-bit code unit (byte) + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU8_IS_SINGLE(c) (((c)&0x80)==0) + +/** + * Is this code unit (byte) a UTF-8 lead byte? + * @param c 8-bit code unit (byte) + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU8_IS_LEAD(c) ((uint8)((c)-0xc0)<0x3e) + +/** + * Is this code unit (byte) a UTF-8 trail byte? + * @param c 8-bit code unit (byte) + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU8_IS_TRAIL(c) (((c)&0xc0)==0x80) + +/** + * How many code units (bytes) are used for the UTF-8 encoding + * of this Unicode code point? + * @param c 32-bit code point + * @return 1..4, or 0 if c is a surrogate or not a Unicode code point + * @stable ICU 2.4 + */ +#define CBU8_LENGTH(c) \ + ((uint32)(c)<=0x7f ? 1 : \ + ((uint32)(c)<=0x7ff ? 2 : \ + ((uint32)(c)<=0xd7ff ? 3 : \ + ((uint32)(c)<=0xdfff || (uint32)(c)>0x10ffff ? 0 : \ + ((uint32)(c)<=0xffff ? 3 : 4)\ + ) \ + ) \ + ) \ + ) + +/** + * The maximum number of UTF-8 code units (bytes) per Unicode code point (U+0000..U+10ffff). + * @return 4 + * @stable ICU 2.4 + */ +#define CBU8_MAX_LENGTH 4 + +/** + * Function for handling "next code point" with error-checking. + * @internal + */ +UChar32 utf8_nextCharSafeBody(const uint8 *s, int32 *pi, int32 length, UChar32 c, UBool strict); + +/** + * Get a code point from a string at a code point boundary offset, + * and advance the offset to the next code point boundary. + * (Post-incrementing forward iteration.) + * "Safe" macro, checks for illegal sequences and for string boundaries. + * + * The offset may point to the lead byte of a multi-byte sequence, + * in which case the macro will read the whole sequence. + * If the offset points to a trail byte or an illegal UTF-8 sequence, then + * c is set to a negative value. + * + * @param s const uint8 * string + * @param i string offset, i<length + * @param length string length + * @param c output UChar32 variable, set to <0 in case of an error + * @see CBU8_NEXT_UNSAFE + * @stable ICU 2.4 + */ +#define CBU8_NEXT(s, i, length, c) { \ + (c)=(s)[(i)++]; \ + if(((uint8)(c))>=0x80) { \ + if(CBU8_IS_LEAD(c)) { \ + (c)=base_icu::utf8_nextCharSafeBody((const uint8 *)s, &(i), (int32)(length), c, -1); \ + } else { \ + (c)=CBU_SENTINEL; \ + } \ + } \ +} + +/** + * Append a code point to a string, overwriting 1 to 4 bytes. + * The offset points to the current end of the string contents + * and is advanced (post-increment). + * "Unsafe" macro, assumes a valid code point and sufficient space in the string. + * Otherwise, the result is undefined. + * + * @param s const uint8 * string buffer + * @param i string offset + * @param c code point to append + * @see CBU8_APPEND + * @stable ICU 2.4 + */ +#define CBU8_APPEND_UNSAFE(s, i, c) { \ + if((uint32)(c)<=0x7f) { \ + (s)[(i)++]=(uint8)(c); \ + } else { \ + if((uint32)(c)<=0x7ff) { \ + (s)[(i)++]=(uint8)(((c)>>6)|0xc0); \ + } else { \ + if((uint32)(c)<=0xffff) { \ + (s)[(i)++]=(uint8)(((c)>>12)|0xe0); \ + } else { \ + (s)[(i)++]=(uint8)(((c)>>18)|0xf0); \ + (s)[(i)++]=(uint8)((((c)>>12)&0x3f)|0x80); \ + } \ + (s)[(i)++]=(uint8)((((c)>>6)&0x3f)|0x80); \ + } \ + (s)[(i)++]=(uint8)(((c)&0x3f)|0x80); \ + } \ +} + +// UTF-16 macros --------------------------------------------------------------- +// from utf8.h + +/** + * Does this code unit alone encode a code point (BMP, not a surrogate)? + * @param c 16-bit code unit + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU16_IS_SINGLE(c) !U_IS_SURROGATE(c) + +/** + * Is this code unit a lead surrogate (U+d800..U+dbff)? + * @param c 16-bit code unit + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800) + +/** + * Is this code unit a trail surrogate (U+dc00..U+dfff)? + * @param c 16-bit code unit + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00) + +/** + * Is this code unit a surrogate (U+d800..U+dfff)? + * @param c 16-bit code unit + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU16_IS_SURROGATE(c) CBU_IS_SURROGATE(c) + +/** + * Assuming c is a surrogate code point (U16_IS_SURROGATE(c)), + * is it a lead surrogate? + * @param c 16-bit code unit + * @return TRUE or FALSE + * @stable ICU 2.4 + */ +#define CBU16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0) + +/** + * Helper constant for CBU16_GET_SUPPLEMENTARY. + * @internal + */ +#define CBU16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000) + +/** + * Get a supplementary code point value (U+10000..U+10ffff) + * from its lead and trail surrogates. + * The result is undefined if the input values are not + * lead and trail surrogates. + * + * @param lead lead surrogate (U+d800..U+dbff) + * @param trail trail surrogate (U+dc00..U+dfff) + * @return supplementary code point (U+10000..U+10ffff) + * @stable ICU 2.4 + */ +#define CBU16_GET_SUPPLEMENTARY(lead, trail) \ + (((base_icu::UChar32)(lead)<<10UL)+(base_icu::UChar32)(trail)-CBU16_SURROGATE_OFFSET) + + +/** + * Get the lead surrogate (0xd800..0xdbff) for a + * supplementary code point (0x10000..0x10ffff). + * @param supplementary 32-bit code point (U+10000..U+10ffff) + * @return lead surrogate (U+d800..U+dbff) for supplementary + * @stable ICU 2.4 + */ +#define CBU16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0) + +/** + * Get the trail surrogate (0xdc00..0xdfff) for a + * supplementary code point (0x10000..0x10ffff). + * @param supplementary 32-bit code point (U+10000..U+10ffff) + * @return trail surrogate (U+dc00..U+dfff) for supplementary + * @stable ICU 2.4 + */ +#define CBU16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00) + +/** + * How many 16-bit code units are used to encode this Unicode code point? (1 or 2) + * The result is not defined if c is not a Unicode code point (U+0000..U+10ffff). + * @param c 32-bit code point + * @return 1 or 2 + * @stable ICU 2.4 + */ +#define CBU16_LENGTH(c) ((uint32)(c)<=0xffff ? 1 : 2) + +/** + * The maximum number of 16-bit code units per Unicode code point (U+0000..U+10ffff). + * @return 2 + * @stable ICU 2.4 + */ +#define CBU16_MAX_LENGTH 2 + +/** + * Append a code point to a string, overwriting 1 or 2 code units. + * The offset points to the current end of the string contents + * and is advanced (post-increment). + * "Unsafe" macro, assumes a valid code point and sufficient space in the string. + * Otherwise, the result is undefined. + * + * @param s const UChar * string buffer + * @param i string offset + * @param c code point to append + * @see CBU16_APPEND + * @stable ICU 2.4 + */ +#define CBU16_APPEND_UNSAFE(s, i, c) { \ + if((uint32)(c)<=0xffff) { \ + (s)[(i)++]=(uint16)(c); \ + } else { \ + (s)[(i)++]=(uint16)(((c)>>10)+0xd7c0); \ + (s)[(i)++]=(uint16)(((c)&0x3ff)|0xdc00); \ + } \ +} + +} // namesapce base_icu + +#endif // BASE_THIRD_PARTY_ICU_ICU_UTF_H_ |