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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 1999-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
*/
#ifndef BASE_THIRD_PARTY_ICU_ICU_UTF_H_
#define BASE_THIRD_PARTY_ICU_ICU_UTF_H_
#include <stdint.h>
namespace base_icu {
// source/common/unicode/umachine.h
/** The ICU boolean type @stable ICU 2.0 */
typedef int8_t UBool;
/**
* Define UChar32 as a type for single Unicode code points.
* UChar32 is a signed 32-bit integer (same as int32_t).
*
* The Unicode code point range is 0..0x10ffff.
* All other values (negative or >=0x110000) are illegal as Unicode code points.
* They may be used as sentinel values to indicate "done", "error"
* or similar non-code point conditions.
*
* Before ICU 2.4 (Jitterbug 2146), UChar32 was defined
* to be wchar_t if that is 32 bits wide (wchar_t may be signed or unsigned)
* or else to be uint32_t.
* That is, the definition of UChar32 was platform-dependent.
*
* @see U_SENTINEL
* @stable ICU 2.4
*/
typedef int32_t UChar32;
/**
* 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 U_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)
/**
* \def UPRV_BLOCK_MACRO_BEGIN
* Defined as the "do" keyword by default.
* @internal
*/
#ifndef CBUPRV_BLOCK_MACRO_BEGIN
#define CBUPRV_BLOCK_MACRO_BEGIN do
#endif
/**
* \def UPRV_BLOCK_MACRO_END
* Defined as "while (FALSE)" by default.
* @internal
*/
#ifndef CBUPRV_BLOCK_MACRO_END
#define CBUPRV_BLOCK_MACRO_END while (0)
#endif
// source/common/unicode/utf.h
/**
* 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 && \
((c)<=0xfdef || ((c)&0xfffe)==0xfffe) && (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_t)(c)<0xd800 || \
(0xdfff<(c) && (c)<=0x10ffff && !CBU_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) (((uint32_t)(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)
// source/common/unicode/utf8.h
/**
* Internal bit vector for 3-byte UTF-8 validity check, for use in U8_IS_VALID_LEAD3_AND_T1.
* Each bit indicates whether one lead byte + first trail byte pair starts a valid sequence.
* Lead byte E0..EF bits 3..0 are used as byte index,
* first trail byte bits 7..5 are used as bit index into that byte.
* @see U8_IS_VALID_LEAD3_AND_T1
* @internal
*/
#define CBU8_LEAD3_T1_BITS "\x20\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x10\x30\x30"
/**
* Internal 3-byte UTF-8 validity check.
* Non-zero if lead byte E0..EF and first trail byte 00..FF start a valid sequence.
* @internal
*/
#define CBU8_IS_VALID_LEAD3_AND_T1(lead, t1) (CBU8_LEAD3_T1_BITS[(lead)&0xf]&(1<<((uint8_t)(t1)>>5)))
/**
* Internal bit vector for 4-byte UTF-8 validity check, for use in U8_IS_VALID_LEAD4_AND_T1.
* Each bit indicates whether one lead byte + first trail byte pair starts a valid sequence.
* First trail byte bits 7..4 are used as byte index,
* lead byte F0..F4 bits 2..0 are used as bit index into that byte.
* @see U8_IS_VALID_LEAD4_AND_T1
* @internal
*/
#define CBU8_LEAD4_T1_BITS "\x00\x00\x00\x00\x00\x00\x00\x00\x1E\x0F\x0F\x0F\x00\x00\x00\x00"
/**
* Internal 4-byte UTF-8 validity check.
* Non-zero if lead byte F0..F4 and first trail byte 00..FF start a valid sequence.
* @internal
*/
#define CBU8_IS_VALID_LEAD4_AND_T1(lead, t1) (CBU8_LEAD4_T1_BITS[(uint8_t)(t1)>>4]&(1<<((lead)&7)))
/**
* 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? (0xC2..0xF4)
* @param c 8-bit code unit (byte)
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define CBU8_IS_LEAD(c) ((uint8_t)((c)-0xc2)<=0x32)
/**
* Is this code unit (byte) a UTF-8 trail byte? (0x80..0xBF)
* @param c 8-bit code unit (byte)
* @return TRUE or FALSE
* @stable ICU 2.4
*/
#define CBU8_IS_TRAIL(c) ((int8_t)(c)<-0x40)
/**
* 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_t)(c)<=0x7f ? 1 : \
((uint32_t)(c)<=0x7ff ? 2 : \
((uint32_t)(c)<=0xd7ff ? 3 : \
((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
((uint32_t)(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
/**
* 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 length can be negative for a NUL-terminated string.
*
* 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_t * string
* @param i int32_t string offset, must be i<length
* @param length int32_t string length
* @param c output UChar32 variable, set to <0 in case of an error
* @see U8_NEXT_UNSAFE
* @stable ICU 2.4
*/
#define CBU8_NEXT(s, i, length, c) CBU8_INTERNAL_NEXT_OR_SUB(s, i, length, c, CBU_SENTINEL)
/** @internal */
#define CBU8_INTERNAL_NEXT_OR_SUB(s, i, length, c, sub) CBUPRV_BLOCK_MACRO_BEGIN { \
(c)=(uint8_t)(s)[(i)++]; \
if(!CBU8_IS_SINGLE(c)) { \
uint8_t __t = 0; \
if((i)!=(length) && \
/* fetch/validate/assemble all but last trail byte */ \
((c)>=0xe0 ? \
((c)<0xf0 ? /* U+0800..U+FFFF except surrogates */ \
CBU8_LEAD3_T1_BITS[(c)&=0xf]&(1<<((__t=(s)[i])>>5)) && \
(__t&=0x3f, 1) \
: /* U+10000..U+10FFFF */ \
((c)-=0xf0)<=4 && \
CBU8_LEAD4_T1_BITS[(__t=(s)[i])>>4]&(1<<(c)) && \
((c)=((c)<<6)|(__t&0x3f), ++(i)!=(length)) && \
(__t=(s)[i]-0x80)<=0x3f) && \
/* valid second-to-last trail byte */ \
((c)=((c)<<6)|__t, ++(i)!=(length)) \
: /* U+0080..U+07FF */ \
(c)>=0xc2 && ((c)&=0x1f, 1)) && \
/* last trail byte */ \
(__t=(s)[i]-0x80)<=0x3f && \
((c)=((c)<<6)|__t, ++(i), 1)) { \
} else { \
(c)=(sub); /* ill-formed*/ \
} \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* 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_t * string buffer
* @param i string offset
* @param c code point to append
* @see U8_APPEND
* @stable ICU 2.4
*/
#define CBU8_APPEND_UNSAFE(s, i, c) \
CBUPRV_BLOCK_MACRO_BEGIN { \
uint32_t __uc = (uint32_t)(c); \
if (__uc <= 0x7f) { \
(s)[(i)++] = (uint8_t)__uc; \
} else { \
if (__uc <= 0x7ff) { \
(s)[(i)++] = (uint8_t)((__uc >> 6) | 0xc0); \
} else { \
if (__uc <= 0xffff) { \
(s)[(i)++] = (uint8_t)((__uc >> 12) | 0xe0); \
} else { \
(s)[(i)++] = (uint8_t)((__uc >> 18) | 0xf0); \
(s)[(i)++] = (uint8_t)(((__uc >> 12) & 0x3f) | 0x80); \
} \
(s)[(i)++] = (uint8_t)(((__uc >> 6) & 0x3f) | 0x80); \
} \
(s)[(i)++] = (uint8_t)((__uc & 0x3f) | 0x80); \
} \
} \
CBUPRV_BLOCK_MACRO_END
// source/common/unicode/utf16.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) !CBU_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) (((uint32_t)(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) (((uint32_t)(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 U16_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) (::base_icu::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) (::base_icu::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_t)(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
/**
* Get a code point from a string at a random-access offset,
* without changing the offset.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The offset may point to either the lead or trail surrogate unit
* for a supplementary code point, in which case the macro will read
* the adjacent matching surrogate as well.
*
* The length can be negative for a NUL-terminated string.
*
* If the offset points to a single, unpaired surrogate, then
* c is set to that unpaired surrogate.
* Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<=i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_GET_UNSAFE
* @stable ICU 2.4
*/
#define CBU16_GET(s, start, i, length, c) CBUPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[i]; \
if(CBU16_IS_SURROGATE(c)) { \
uint16_t __c2; \
if(CBU16_IS_SURROGATE_LEAD(c)) { \
if((i)+1!=(length) && CBU16_IS_TRAIL(__c2=(s)[(i)+1])) { \
(c)=CBU16_GET_SUPPLEMENTARY((c), __c2); \
} \
} else { \
if((i)>(start) && CBU16_IS_LEAD(__c2=(s)[(i)-1])) { \
(c)=CBU16_GET_SUPPLEMENTARY(__c2, (c)); \
} \
} \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* 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, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* The offset may point to the lead surrogate unit
* for a supplementary code point, in which case the macro will read
* the following trail surrogate as well.
* If the offset points to a trail surrogate or
* to a single, unpaired lead surrogate, then c is set to that unpaired surrogate.
*
* @param s const UChar * string
* @param i string offset, must be i<length
* @param length string length
* @param c output UChar32 variable
* @see U16_NEXT_UNSAFE
* @stable ICU 2.4
*/
#define CBU16_NEXT(s, i, length, c) CBUPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[(i)++]; \
if(CBU16_IS_LEAD(c)) { \
uint16_t __c2; \
if((i)!=(length) && CBU16_IS_TRAIL(__c2=(s)[(i)])) { \
++(i); \
(c)=CBU16_GET_SUPPLEMENTARY((c), __c2); \
} \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* 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 U16_APPEND
* @stable ICU 2.4
*/
#define CBU16_APPEND_UNSAFE(s, i, c) CBUPRV_BLOCK_MACRO_BEGIN { \
if((uint32_t)(c)<=0xffff) { \
(s)[(i)++]=(uint16_t)(c); \
} else { \
(s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
(s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary
* at the start of a code point.
* If the offset points to the trail surrogate of a surrogate pair,
* then the offset is decremented.
* Otherwise, it is not modified.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<=i
* @see U16_SET_CP_START_UNSAFE
* @stable ICU 2.4
*/
#define CBU16_SET_CP_START(s, start, i) CBUPRV_BLOCK_MACRO_BEGIN { \
if(CBU16_IS_TRAIL((s)[i]) && (i)>(start) && CBU16_IS_LEAD((s)[(i)-1])) { \
--(i); \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* Move the string offset from one code point boundary to the previous one
* and get the code point between them.
* (Pre-decrementing backward iteration.)
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The input offset may be the same as the string length.
* If the offset is behind a trail surrogate unit
* for a supplementary code point, then the macro will read
* the preceding lead surrogate as well.
* If the offset is behind a lead surrogate or behind a single, unpaired
* trail surrogate, then c is set to that unpaired surrogate.
*
* @param s const UChar * string
* @param start starting string offset (usually 0)
* @param i string offset, must be start<i
* @param c output UChar32 variable
* @see U16_PREV_UNSAFE
* @stable ICU 2.4
*/
#define CBU16_PREV(s, start, i, c) CBUPRV_BLOCK_MACRO_BEGIN { \
(c)=(s)[--(i)]; \
if(CBU16_IS_TRAIL(c)) { \
uint16_t __c2; \
if((i)>(start) && CBU16_IS_LEAD(__c2=(s)[(i)-1])) { \
--(i); \
(c)=CBU16_GET_SUPPLEMENTARY(__c2, (c)); \
} \
} \
} CBUPRV_BLOCK_MACRO_END
/**
* Adjust a random-access offset to a code point boundary after a code point.
* If the offset is behind the lead surrogate of a surrogate pair,
* then the offset is incremented.
* Otherwise, it is not modified.
* The input offset may be the same as the string length.
* "Safe" macro, handles unpaired surrogates and checks for string boundaries.
*
* The length can be negative for a NUL-terminated string.
*
* @param s const UChar * string
* @param start int32_t starting string offset (usually 0)
* @param i int32_t string offset, start<=i<=length
* @param length int32_t string length
* @see U16_SET_CP_LIMIT_UNSAFE
* @stable ICU 2.4
*/
#define CBU16_SET_CP_LIMIT(s, start, i, length) CBUPRV_BLOCK_MACRO_BEGIN { \
if((start)<(i) && ((i)<(length) || (length)<0) && CBU16_IS_LEAD((s)[(i)-1]) && CBU16_IS_TRAIL((s)[i])) { \
++(i); \
} \
} CBUPRV_BLOCK_MACRO_END
} // namesapce base_icu
#endif // BASE_THIRD_PARTY_ICU_ICU_UTF_H_
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