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Diffstat (limited to 'unicode/unicode.h')
| -rw-r--r-- | unicode/unicode.h | 1692 |
1 files changed, 1692 insertions, 0 deletions
diff --git a/unicode/unicode.h b/unicode/unicode.h new file mode 100644 index 0000000..4e018b7 --- /dev/null +++ b/unicode/unicode.h @@ -0,0 +1,1692 @@ +#ifndef unicode_h +#define unicode_h + +/* +** Copyright 2000-2011 Double Precision, Inc. +** See COPYING for distribution information. +** +*/ + +#ifdef __cplusplus + +#include <string> +#include <vector> +#include <list> + +extern "C" { +#endif + +#if 0 +} +#endif + +#include "unicode/unicode_config.h" + +#include <stdlib.h> + +#include <stdio.h> +#if HAVE_WCHAR_H +#include <wchar.h> +#endif + +#if HAVE_STDDEF_H +#include <stddef.h> +#endif +#include <stdint.h> + +#include <sys/types.h> + +typedef uint32_t unicode_char; + +/* +** The system default character set, from the locale. +*/ + +extern const char *unicode_default_chset(); + +/* Unicode upper/lower/title case conversion functions */ + +extern unicode_char unicode_uc(unicode_char); +extern unicode_char unicode_lc(unicode_char); +extern unicode_char unicode_tc(unicode_char); + +/* +** Look up HTML 4.0/XHTML entity. +** +** n="amp", etc... +** +** Returns the unicode entity value, or 0 if no such entity is defined. +*/ + +unicode_char unicode_html40ent_lookup(const char *n); + +/* +** +** Return "width" of unicode character. +** +** This is defined as follows: for characters having the F or W property in +** tr11 (EastAsianWidth), unicode_wcwidth() returns 2. +** +** Otherwise, characters having the BK, CR, LF, CM, NL, WJ, and ZW line +** breaking property as per tr14, unicode_wcwdith() returns 0. For all other +** cases, 1. +** +** This provides a rough estimate of the "width" of the character if its +** shown on a text console. +*/ + +extern int unicode_wcwidth(unicode_char c); +extern size_t unicode_wcwidth_str(const unicode_char *c); + +/* +** The unicode-ish isspace() +*/ +extern int unicode_isspace(unicode_char ch); + +/* Internal unicode table lookup function */ + +extern uint8_t unicode_tab_lookup(unicode_char ch, + const size_t *unicode_indextab, + size_t unicode_indextab_sizeof, + const uint8_t (*unicode_rangetab)[2], + const uint8_t *unicode_classtab, + uint8_t uclass); + +/* +** Implementation of grapheme cluster boundary rules, as per tr29, +** including GB9a and GB9b. +** +** Returns non-zero if there's a grapheme break between the two referenced +** characters. +*/ + +int unicode_grapheme_break(unicode_char a, unicode_char b); + +/* +** Implementation of line break rules, as per tr14. +** +** Invoke unicode_lb_init() to initialize the linebreaking algorithm. The +** first parameter is a callback function that gets invoked with two +** arguments: UNICODE_LB_{MANDATORY|NONE|ALLOWED}, and a passthrough argument. +** The second parameter to unicode_lb_init() is the opaque passthrough +** pointer, that is passed as the second argument to the callback function +** with no further interpretation. +** +** unicode_lb_init() returns an opaque handle. Invoke unicode_lb_next(), +** passing the handle and one unicode character. Repeatedly invoke +** unicode_lb_next() to specify the input string for the linebreaking +** algorithm, then invoke unicode_lb_end() to finish calculating the +** linebreaking algorithm, and deallocate the opaque linebreaking handle. +** +** The callback function gets invoked once for each invocation of +** unicode_lb_next(). The contract is that before unicode_lb_end() returns, +** the callback function will get invoked the exact number of times that +** unicode_lb_next(), as long as each invocation of the callback function +** returned 0; nothing more, nothing less. The first parameter to the callback +** function will be one of the following values: +** +** UNICODE_LB_MANDATORY - a linebreak is MANDATORY before the corresponding +** character. +** UNICODE_LB_NONE - a linebreak is PROHIBITED before the corresponding +** character. +** UNICODE_LB_ALLOWED - a linebreak is OPTIONAL before the corresponding +** character (the preceding character is a space, or an equivalent). +** +** The callback function should return 0. A non-zero value indicates an +** error, which gets propagated up to the caller. The contract that the +** callback function gets invoked the same number of times that +** unicode_lb_next() gets invoked is now broken. +*/ + +#define UNICODE_LB_MANDATORY -1 +#define UNICODE_LB_NONE 0 +#define UNICODE_LB_ALLOWED 1 + +struct unicode_lb_info; + +typedef struct unicode_lb_info *unicode_lb_info_t; + +/* +** Allocate a linebreaking handle. +*/ +extern unicode_lb_info_t unicode_lb_init(int (*cb_func)(int, void *), + void *cb_arg); + +/* +** Feed the next character through the linebreaking algorithm. +** A non-zero return code indicates that the callback function was invoked +** and it returned a non-zero return code (which is propagated as a return +** value). unicode_lb_end() must still be invoked, in this case. +** +** A zero return code indicates that if the callback function was invoked, +** it returned 0. +*/ + +extern int unicode_lb_next(unicode_lb_info_t i, unicode_char ch); + +/* +** Convenience function that invokes unicode_lb_next() with a list of +** unicode chars. Returns 0 if all invocations of unicode_lb_next() returned +** 0, or the first non-zero return value from unicode_lb_next(). +*/ + +extern int unicode_lb_next_cnt(unicode_lb_info_t i, + const unicode_char *chars, + size_t cnt); + +/* +** Finish the linebreaking algorithm. +** +** A non-zero return code indicates that the callback function was invoked +** and it returned a non-zero return code (which is propagated as a return +** value). +** +** A zero return code indicates that if the callback function was invoked, +** it returned 0, and that the callback function was invoked exactly the same +** number of times that unicode_lb_next() was invoked. +** +** In all case, the linebreak handle will no longer be valid when this +** function returns. +*/ + +extern int unicode_lb_end(unicode_lb_info_t i); + +/* +** An alternative linebreak API where the callback function receives the +** original unicode character in addition to its linebreak value. +** +** User unicode_lbc_init(), unicode_lbc_next(), and unicode_lbc_end(), whose +** semantics are the same as their _lb_ counterparts. +*/ + +struct unicode_lbc_info; + +typedef struct unicode_lbc_info *unicode_lbc_info_t; + +extern unicode_lbc_info_t unicode_lbc_init(int (*cb_func)(int, unicode_char, + void *), + void *cb_arg); +extern int unicode_lbc_next(unicode_lbc_info_t i, unicode_char ch); +extern int unicode_lbc_end(unicode_lbc_info_t i); + +/* +** Set linebreaking options. +** +** OPTIONS SUBJECT TO CHANGE. +*/ + +extern void unicode_lb_set_opts(unicode_lb_info_t i, int opts); + +extern void unicode_lbc_set_opts(unicode_lbc_info_t i, int opts); + +/* +** Tailorization of LB24: Prevent pluses, as in "C++", from breaking. +** +** Adds the following to LB24: +** +** PR x PR +** +** AL x PR +** +** ID x PR +**/ +#define UNICODE_LB_OPT_PRBREAK 0x0001 + + +/* +** Tailored / breaking rules. +** +** Adds the following rule to LB13: +** +** SY x EX +** +** SY x AL +** +** SY x ID +** +** SP รท SY, which takes precedence over "x SY". +*/ +#define UNICODE_LB_OPT_SYBREAK 0x0002 + +/* +** Tailored / breaking rules. +** +** This reclassifies U+2013 and U+2014 as class WJ, prohibiting breaks before +** and after mdash and ndash. +*/ +#define UNICODE_LB_OPT_DASHWJ 0x0004 + +/* +** Implemention of word break rules, as per tr29. +** +** Invoke unicode_wb_init() to initialize the wordbreaking algorithm. The +** first parameter is a callback function that gets invoked with two +** arguments: an int flag, and a passthrough argument. The second parameter to +** unicode_wb_init() is the opaque passthrough pointer, that is passed as the +** second argument to the callback function with no further interpretation. +** +** unicode_wb_init() returns an opaque handle. Invoke unicode_wb_next(), +** passing the handle and one unicode character. Repeatedly invoke +** unicode_wb_next() to specify the input string for the wordbreaking +** algorithm, then invoke unicode_wb_end() to finish calculating the +** wordbreaking algorithm, and deallocate the opaque wordbreaking handle. +** +** The callback function gets invoked once for each invocation of +** unicode_wb_next(). The contract is that before unicode_wb_end() returns, +** the callback function will get invoked the exact number of times that +** unicode_wb_next(), as long as each invocation of the callback function +** returned 0; nothing more, nothing less. The first parameter to the callback +** function will be an int. A non-zero value indicates that there is a word +** break between this character and the preceding one. +** +** The callback function should return 0. A non-zero value indicates an +** error, which gets propagated up to the caller. The contract that the +** callback function gets invoked the same number of times that +** unicode_lb_next() gets invoked is now broken. +*/ + +struct unicode_wb_info; + +typedef struct unicode_wb_info *unicode_wb_info_t; + +/* +** Allocate a wordbreaking handle. +*/ +extern unicode_wb_info_t unicode_wb_init(int (*cb_func)(int, void *), + void *cb_arg); + +/* +** Feed the next character through the wordbreaking algorithm. +** A non-zero return code indicates that the callback function was invoked +** and it returned a non-zero return code (which is propagated as a return +** value). unicode_wb_end() must still be invoked, in this case. +** +** A zero return code indicates that if the callback function was invoked, +** it returned 0. +*/ + +extern int unicode_wb_next(unicode_wb_info_t i, unicode_char ch); + +/* +** Convenience function that invokes unicode_wb_next() with a list of +** unicode chars. Returns 0 if all invocations of unicode_wb_next() returned +** 0, or the first non-zero return value from unicode_wb_next(). +*/ + +extern int unicode_wb_next_cnt(unicode_wb_info_t i, + const unicode_char *chars, + size_t cnt); + +/* +** Finish the wordbreaking algorithm. +** +** A non-zero return code indicates that the callback function was invoked +** and it returned a non-zero return code (which is propagated as a return +** value). +** +** A zero return code indicates that if the callback function was invoked, +** it returned 0, and that the callback function was invoked exactly the same +** number of times that unicode_wb_next() was invoked. +** +** In all case, the wordbreak handle will no longer be valid when this +** function returns. +*/ + +extern int unicode_wb_end(unicode_wb_info_t i); + +/* +** Search for a word boundary. +** +** Obtain a handle by calling unicode_wbscan_init(), then invoke +** unicode_wbscan_next() to provide a unicode stream, then invoke +** unicode_wbscan_end(). unicode_wbscan_end() returns the number of unicode +** characters from the beginning of the stream until the first word boundary. +** +** You may prematurely stop calling unicode_wbscan_next() once it returns a +** non-0 value, which means that there is sufficient context to compute the +** first word boundary, and all further calls to unicode_wbscan_next() will +** be internal no-ops. +*/ + +struct unicode_wbscan_info; + +typedef struct unicode_wbscan_info *unicode_wbscan_info_t; + +unicode_wbscan_info_t unicode_wbscan_init(); + +int unicode_wbscan_next(unicode_wbscan_info_t i, unicode_char ch); + +size_t unicode_wbscan_end(unicode_wbscan_info_t i); + +/* +** A buffer that holds unicode characters, and dynamically grows as needed. +*/ + +struct unicode_buf { + unicode_char *ptr; /* The unicode characters */ + size_t size, /* Buffer size */ + len, /* How many characters in ptr are initialized */ + max; /* Maximum size the buffer can grow to */ +}; + +/* +** Initialize a buffer. Constructor. +*/ + +void unicode_buf_init(/* Initialize this structure. ptr, size, len cleared */ + struct unicode_buf *p, + + /* + ** Maximum size the buffer can grow to. (size_t)-1 + ** means unlimited. + */ + size_t max); +/* +** Like unicode_buf_init, and initialize the new buffer with the contents of +** another buffer. The maximum size of the initialized buffer is exactly the +** number of characters in the existing buffer. This copies a buffer using +** the minimum amount of heap space. +*/ + +#define unicode_buf_init_copy(a,b) \ + do { \ + unicode_buf_init((a), unicode_buf_len(b)); \ + unicode_buf_append_buf((a),(b)); \ + } while (0) + +/* +** Deinitialize the buffer. Destructor. Frees memory. +*/ + +void unicode_buf_deinit(struct unicode_buf *p); + +/* +** Official way to access the characters in the unicode buffer. +*/ +#define unicode_buf_ptr(p) ((p)->ptr) + +/* +** Official way of obtaining the number of characters in the unicode buffer. +*/ +#define unicode_buf_len(p) ((p)->len) + +/* +** Remove all existing characters from an initialized buffer. Sets len to 0. +*/ + +#define unicode_buf_clear(p) ((p)->len=0) + +/* +** Append characters to the existing characters in the unicode buffer. +** The buffer grows, if needed. If the buffer would exceed its maximum size, +** the extra characters get truncated. +** +** Returns 0 if the characters were appended. -1 for a malloc failure. +*/ + +int unicode_buf_append(struct unicode_buf *p, /* The buffer */ + const unicode_char *uc, /* Characters to append */ + size_t l); /* How many of them */ + +/* +** Convert an iso-8859-1 char string and invoke unicode_buf_append(). +*/ + +void unicode_buf_append_char(struct unicode_buf *dst, + const char *str, + size_t cnt); + +/* +** Remove some portion of the unicode buffer +*/ + +void unicode_buf_remove(struct unicode_buf *p, /* The buffer */ + size_t pos, /* Offset in buffer */ + size_t cnt); /* How many to remove */ + +/* +** Append the contents of an existing buffer to another one. +*/ + +#define unicode_buf_append_buf(a,b) \ + unicode_buf_append((a), unicode_buf_ptr(b), unicode_buf_len(b)) + + +/* +** The equivalent of strcmp() for unicode buffers. +*/ + +int unicode_buf_cmp(const struct unicode_buf *a, + const struct unicode_buf *b); + +/* +** The equivalent of unicode_buf_cmp, except that the second buffer is an +** iso-8859-1 string. +*/ + +int unicode_buf_cmp_str(const struct unicode_buf *p, + const char *c, /* iso-8859-1 string */ + size_t cl); /* Number of chars in c */ + +/* +** A wrapper for iconv(3). This wrapper provides a different API for iconv(3). +** A handle gets created by libmail_u_convert_init(). +** libmail_u_convert_init() receives a pointer to the output function +** which receives converted character text. +** +** The output function receives a pointer to the converted character text, and +** the number of characters in the converted text. +** +** The character text to convert gets passed, repeatedly, to +** libmail_u_convert(). Each call to libmail_u_convert() results in +** the output function being invoked, zero or more times, with the converted +** text. Finally, libmail_u_convert_deinit() stops the conversion and +** deallocates the conversion handle. +** +** Internal buffering takes place. libmail_u_convert_deinit() may result +** in the output function being called one or more times, to receive the final +** part of the converted character stream. +** +** The output function should return 0. A non-0 value causes +** libmail_u_convert() and/or libmail_u_convert_deinit() returning +** non-0. +*/ + +struct libmail_u_convert_hdr; + +typedef struct libmail_u_convert_hdr *libmail_u_convert_handle_t; + +/* +** libmail_u_convert_init() returns a non-NULL handle for the requested +** conversion, or NULL if the requested conversion is not available. +*/ + +libmail_u_convert_handle_t +libmail_u_convert_init(/* Convert from this chset */ + const char *src_chset, + + /* Convert to this chset */ + const char *dst_chset, + + /* The output function */ + + int (*output_func)(const char *, size_t, void *), + + /* Passthrough arg */ + void *convert_arg); + +/* +** Repeatedly pass the character text to convert to libmail_u_convert(). +** +** Returns non-0 if the output function returned non-0, or 0 if all invocations +** of the output function returned 0. +*/ + +int libmail_u_convert(/* The conversion handle */ + libmail_u_convert_handle_t handle, + + /* Text to convert */ + const char *text, + + /* Number of bytes to convert */ + size_t cnt); + +/* +** Finish character set conversion. The handle gets deallocated. +** +** May still result in one or more invocations of the output function. +** Returns non-zero if any previous invocation of the output function returned +** non-zero (this includes any invocations of the output function resulting +** from this call, or prior libmail_u_convert() calls), or 0 if all +** invocations of the output function returned 0. +** +** If the errptr is not NULL, *errptr is set to non-zero if there were any +** conversion errors -- if there was any text that could not be converted to +** the destination character text. +*/ + +int libmail_u_convert_deinit(libmail_u_convert_handle_t handle, + int *errptr); + + +/* +** Specialization: save converted character text in a buffer. +** +** Implementation: call libmail_u_convert_tocbuf_init() instead of +** libmail_u_convert_init(), then call libmail_u_convert() and +** libmail_u_convert_deinit(), as usual. +** +** If libmail_u_convert_deinit() returns 0, *cbufptr_ret gets initialized to a +** malloc()ed buffer, and the number of converted characters, the size of the +** malloc()ed buffer, are placed into *csize_ret arguments, that were passed +** to libmail_u_convert_tou_init(). +** +** Note: if the converted string is an empty string, *cbufsize_ret is set to 0, +** but *cbufptr_ptr still gets initialized (to a dummy malloced buffer). +** +** The optional nullterminate places a trailing \0 character after the +** converted string (this is included in *cbufsize_ret). +*/ + +libmail_u_convert_handle_t +libmail_u_convert_tocbuf_init(/* Convert from this chset */ + const char *src_chset, + + /* Convert to this chset */ + const char *dst_chset, + + /* malloced buffer */ + char **cbufptr_ret, + + /* size of the malloced buffer */ + size_t *cbufsize_ret, + + /* null terminate the resulting string */ + int nullterminate + ); + + +/* +** Specialization: convert some character text to a unicode_char array. +** +** This is like libmail_u_convert_tocbuf_init(), but converts to a unicode_char +** array. +** +** The returned *ucsize_ret is initialized with the number of unicode_chars, +** rather than the byte count. +** +** In all other ways, this function behaves identically to +** libmail_u_convert_tocbuf_init(). +*/ + +libmail_u_convert_handle_t +libmail_u_convert_tou_init(/* Convert from this chset */ + const char *src_chset, + + /* malloc()ed buffer pointer, on exit. */ + unicode_char **ucptr_ret, + + /* size of the malloc()ed buffer, upon exit */ + size_t *ucsize_ret, + + /* If true, terminate with U+0x0000, for convenience */ + int nullterminate + ); + +/* +** Specialization: convert a unicode_char array to some character text. +** +** This is the opposite of libmail_u_convert_tou_init(). Call this to +** initialize the conversion handle, then use libmail_u_convert_uc() +** instead of libmail_u_convert. +*/ + +libmail_u_convert_handle_t +libmail_u_convert_fromu_init(/* Convert to this chset */ + const char *dst_chset, + + /* malloc()ed buffer pointer, on exit. */ + char **cbufptr_ret, + + /* size of the malloc()ed buffer, upon exit */ + size_t *cbufsize_ret, + + /* If true, terminate with U+0x0000, for convenience */ + int nullterminate + ); + +int libmail_u_convert_uc(/* The conversion handle */ + libmail_u_convert_handle_t handle, + + /* Text to convert */ + const unicode_char *text, + + /* Number of bytes to convert */ + size_t cnt); + +/* +** Initialize conversion to UTF-8. +** +** This is a wrapper for libmail_u_convert_tocbuf_init() that specifies the +** destination charset as UTF-8. +*/ + +libmail_u_convert_handle_t +libmail_u_convert_tocbuf_toutf8_init(const char *src_chset, + char **cbufptr_ret, + size_t *cbufsize_ret, + int nullterminate); + +/* +** Initialize conversion from UTF-8. +** +** This is a wrapper for libmail_u_convert_tocbuf_init() that specifies the +** source charset as UTF-8. +*/ + +libmail_u_convert_handle_t +libmail_u_convert_tocbuf_fromutf8_init(const char *dst_chset, + char **cbufptr_ret, + size_t *cbufsize_ret, + int nullterminate); + +/* +** Convert a character string to UTF-8. +** +** Returns a malloc-ed buffer holding the UTF-8 string, or NULL if an +** error occured. +*/ +char *libmail_u_convert_toutf8(/* Text to convert to UTF-8 */ + const char *text, + + /* Character set to convert to UTF-8 */ + const char *charset, + + /* + ** If non-NULL, and a non-NULL pointer is + ** returned, *error is set to non-zero if + ** a character conversion error has occured. + */ + int *error); + +/* +** Convert UTF-8 text to another character set. +** +** Returns a malloc-ed buffer holding the string converted to the specified +** character set, or NULL if an error occured. +*/ + +char *libmail_u_convert_fromutf8(/* A UTF-8 string */ + const char *text, + + /* + ** Convert the UTF-8 string to this character + ** set. + */ + + const char *charset, + + /* + ** If non-NULL, and a non-NULL pointer is + ** returned, *error is set to non-zero if + ** a character conversion error has occured. + */ + int *error); + +/* +** Convert one charset to another charset, placing the result in a malloc-ed +** buffer. +** +** Returns a malloc-ed buffer holding the string converted to the specified +** character set, or NULL if an error occured. +*/ + +char *libmail_u_convert_tobuf(/* A string to convert */ + const char *text, + + /* + ** String's charset. + */ + + const char *charset, + + /* + ** Destination charset + */ + const char *dstcharset, + + /* + ** If non-NULL, and a non-NULL pointer is + ** returned, *error is set to non-zero if + ** a character conversion error has occured. + */ + int *error); + +/* +** Convenience function: call libmail_u_convert_tou_init(), feed the +** character string through libmail_u_convert(), then call +** libmail_u_convert_deinit(). +** +** If this function returns 0, *uc and *ucsize is set to a malloced buffer+size +** holding the unicode char array. +*/ + +int libmail_u_convert_tou_tobuf(/* Character text to convert */ + const char *text, + + /* Number of characters */ + size_t text_l, + + /* text's charset */ + const char *charset, + + /* + ** If this function returns 0, this gets + ** initialized + */ + unicode_char **uc, + + /* + ** Size of the allocated buffer + */ + size_t *ucsize, + + /* + ** If not null and this function returns 0, + ** this is set to non-0 if there + ** was a conversion error (but the output + ** buffer gets still allocated and + ** initialized) + */ + int *err); + +/* +** Convenience function: call libmail_u_convert_fromu_init(), feed the +** unicode_array through libmail_u_convert_uc(), then call +** libmail_u_convert_deinit(). +** +** If this function returns 0, *uc and *ucsize is set to a malloced buffer+size +** holding the converted character string +*/ + +int libmail_u_convert_fromu_tobuf(/* Unicode array to convert to a char str */ + const unicode_char *utext, + + /* + ** Size of the unicode array. + ** If this is (size_t)-1, utext is a + ** 0-terminated array. + */ + size_t utext_l, + + /* + ** Convert the unicode array to this charset. + */ + const char *charset, + + /* + ** If libmail_u_convert_fromu_tobuf() + ** returns 0, this is initialized to a + ** malloced buffer with a 0-terminated + ** string is kept. + */ + char **c, + + /* + ** Size of the initialized array, including + ** the 0-terminator. + */ + size_t *csize, + + /* + ** If libmail_u_convert_fromu_tobuf() + ** returns 0 and this is not NULL, + ** *err is set to non-0 if there was a + ** conversion error to the requested + ** character set. + */ + int *err); + +/* +** Convenience function: convert a string in a given character set +** to/from uppercase, lowercase, or something else. +** +** This is done by calling libmail_u_convert_tou_tobuf() first, +** applying the title_func and char_func, then using +** libmail_u_convert_fromu_tobuf(). +** +** A NULL return indicates that the requested conversion cannot be performed. +*/ + +char *libmail_u_convert_tocase( /* String to convert */ + const char *str, + + /* String's character set */ + + const char *charset, + + /* + ** Conversion of the first character in + ** str: unicode_uc, unicode_lc, or unicode_tc: + */ + + unicode_char (*first_char_func)(unicode_char), + + /* + ** Conversion of the second and the remaining + ** character in str. If NULL, same as + ** first_char_func. + */ + unicode_char (*char_func)(unicode_char)); + + + +/* Either UCS-4BE or UCS-4LE, matching the native unicode_char endianness */ + +extern const char libmail_u_ucs4_native[]; + +/* Either UCS-2BE or UCS-2LE, matching the native unicode_char endianness */ + +extern const char libmail_u_ucs2_native[]; + +/* +** Modified-UTF7 encoding used for IMAP folder names. Pass it for a charset +** parameter. +** +** This can be followed by a " " and up to 15 characters to be escaped in +** addition to unicode chars. +*/ + +#define unicode_x_imap_modutf7 "x-imap-modutf7" + +#if 0 +{ +#endif + +#ifdef __cplusplus +} + +extern size_t unicode_wcwidth(const std::vector<unicode_char> &uc); + +namespace mail { + + /* + ** Interface to iconv. + ** + ** Subclass converted(). Invoke begin(), then operator(), repeatedly, + ** then end(). + ** + ** converted() receives the converted text. + */ + + class iconvert { + + libmail_u_convert_handle_t handle; + + public: + iconvert(); + virtual ~iconvert(); + + /* Start conversion. + ** Returns false if the requested conversion cannot be done. + **/ + + bool begin(/* Convert from */ + const std::string &src_chset, + + /* Convert to */ + const std::string &dst_chset); + + /* Feed iconv(3). Returns false if the conversion was aborted. + */ + + bool operator()(const char *, size_t); + + bool operator()(const unicode_char *, size_t); + + /* + ** Get the results here. If the subclass returns a non-0 + ** value, the conversion is aborted. + */ + + virtual int converted(const char *, size_t); + + /* + ** End of conversion. + ** + ** Returns true if all calls to converted() returned 0, + ** false if the conversion was aborted. + ** + ** errflag is set to true if there was a character that could + ** not be converted, and passed to converted(). + */ + + bool end(bool &errflag) + { + return end(&errflag); + } + + bool end() + { + return end(NULL); + } + + /* Convert between two different charsets */ + + static std::string convert(const std::string &text, + const std::string &charset, + const std::string &dstcharset, + bool &errflag); + + /* Convert between two different charsets */ + + static std::string convert(const std::string &text, + const std::string &charset, + const std::string &dstcharset) + { + bool dummy; + + return convert(text, charset, dstcharset, dummy); + } + + /* Convert from unicode to a charset */ + + static std::string convert(const std::vector<unicode_char> &uc, + const std::string &dstcharset, + bool &errflag); + + /* Convert from unicode to a charset */ + + static std::string convert(const std::vector<unicode_char> &uc, + const std::string &dstcharset) + { + bool dummy; + + return convert(uc, dstcharset, dummy); + } + + /* Convert charset to unicode */ + + static bool convert(const std::string &text, + const std::string &charset, + std::vector<unicode_char> &uc); + + + /* Convert to upper/lower/title case */ + + static std::string + convert_tocase(/* Text string */ + const std::string &text, + + /* Its charset */ + const std::string &charset, + + /* First character: unicode_uc, unicode_lc, or unicode_tc */ + unicode_char (*first_char_func)(unicode_char), + + /* If not NULL, second and subsequent chars */ + unicode_char (*char_func)(unicode_char) + =NULL) + { + bool dummy; + + return convert_tocase(text, charset, dummy, + first_char_func, + char_func); + } + + /* Convert to upper/lower/title case */ + + static std::string + convert_tocase(/* Text string */ + const std::string &text, + + /* Its charset */ + const std::string &charset, + + /* Set if there's a conversion error */ + bool &err, + + /* First character: unicode_uc, unicode_lc, or unicode_tc */ + unicode_char (*first_char_func)(unicode_char), + + /* If not NULL, second and subsequent chars */ + unicode_char (*char_func)(unicode_char) + =NULL); + private: + bool end(bool *); + + public: + class tou; + class fromu; + }; + + /* Convert output of iconvert to unicode_chars. */ + + class iconvert::tou : public iconvert { + + public: + bool begin(const std::string &chset); + + virtual int converted(const unicode_char *, size_t); + + using iconvert::operator(); + private: + int converted(const char *ptr, size_t cnt); + + public: + template<typename iter_t> class to_iter_class; + + template<typename input_iter_t, + typename output_iter_t> + static output_iter_t convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + output_iter_t out_iter); + + template<typename input_iter_t> + static void convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + std::vector<unicode_char> &out_buf) + { + out_buf.clear(); + std::back_insert_iterator<std::vector<unicode_char> > + insert_iter(out_buf); + + convert(from_iter, to_iter, chset, insert_iter); + } + + static void convert(const std::string &str, + const std::string &chset, + std::vector<unicode_char> &out_buf); + }; + + /* Helper class that saves unicode output into an output iterator */ + + template<typename iter_t> + class iconvert::tou::to_iter_class : public iconvert::tou { + + iter_t iter; + public: + + to_iter_class(iter_t iterValue) + : iter(iterValue) {} + + using tou::operator(); + + operator iter_t() const { return iter; } + + private: + int converted(const unicode_char *ptr, size_t cnt) + { + while (cnt) + { + *iter=*ptr; + + ++iter; + ++ptr; + --cnt; + } + return 0; + } + }; + + template<typename input_iter_t, + typename output_iter_t> + output_iter_t iconvert::tou::convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + output_iter_t out_iter) + { + class to_iter_class<output_iter_t> out(out_iter); + + if (!out.begin(chset)) + return out; + + std::vector<char> string; + + while (from_iter != to_iter) + { + string.push_back(*from_iter++); + + if (string.size() > 31) + { + out(&string[0], string.size()); + string.clear(); + } + } + + if (string.size() > 0) + out(&string[0], string.size()); + + out.end(); + return out; + } + + /* Convert output of iconvert from unicode_chars. */ + + class iconvert::fromu : public iconvert { + + public: + bool begin(const std::string &chset); + + using iconvert::operator(); + + template<typename iter_t> class to_iter_class; + + template<typename input_iter_t, + typename output_iter_t> + static output_iter_t convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + output_iter_t out_iter); + + template<typename input_iter_t> + static void convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + std::string &out_buf) + { + out_buf=""; + std::back_insert_iterator<std::string> + insert_iter(out_buf); + + convert(from_iter, to_iter, chset, insert_iter); + } + + static void convert(const std::vector<unicode_char> &ubuf, + const std::string &chset, + std::string &out_buf); + + static std::string convert(const std::vector<unicode_char> + &ubuf, + const std::string &chset); + }; + + /* Helper class that saves unicode output into an output iterator */ + + template<typename iter_t> + class iconvert::fromu::to_iter_class : public iconvert::fromu { + + iter_t iter; + public: + + to_iter_class(iter_t iterValue) + : iter(iterValue) {} + + using fromu::operator(); + + operator iter_t() const { return iter; } + + private: + int converted(const char *ptr, size_t cnt) + { + while (cnt) + { + *iter=*ptr; + + ++iter; + ++ptr; + --cnt; + } + return 0; + } + }; + + template<typename input_iter_t, + typename output_iter_t> + output_iter_t iconvert::fromu::convert(input_iter_t from_iter, + input_iter_t to_iter, + const std::string &chset, + output_iter_t out_iter) + { + class to_iter_class<output_iter_t> out(out_iter); + + if (!out.begin(chset)) + return out; + + std::vector<unicode_char> string; + + while (from_iter != to_iter) + { + string.push_back(*from_iter++); + + if (string.size() > 31) + { + out(&string[0], string.size()); + string.clear(); + } + } + + if (string.size() > 0) + out(&string[0], string.size()); + + out.end(); + return out; + } + + /* + ** Unicode linebreaking algorithm, tr14. + */ + + extern "C" int linebreak_trampoline(int value, void *ptr); + extern "C" int linebreakc_trampoline(int value, unicode_char ch, + void *ptr); + + /* + ** Subclass linebreak_callback_base, implement operator()(int). + ** + ** Use operator<< or operator()(iterator, iterator) to feed + ** unicode_chars into the linebreaking algorithm. The subclass receives + ** UNICODE_LB values, as they become available. + */ + + class linebreak_callback_base { + + unicode_lb_info_t handle; + + int opts; + + linebreak_callback_base(const linebreak_callback_base &); + /* NOT IMPLEMENTED */ + + linebreak_callback_base &operator==(const + linebreak_callback_base &); + /* NOT IMPLEMENTED */ + + public: + linebreak_callback_base(); + virtual ~linebreak_callback_base(); + + void finish(); + + void set_opts(int opts); + + friend int linebreak_trampoline(int, void *); + + linebreak_callback_base &operator<<(unicode_char uc); + + template<typename iter_type> + linebreak_callback_base &operator()(iter_type beg_iter, + iter_type end_iter) + { + while (beg_iter != end_iter) + operator<<(*beg_iter++); + return *this; + } + + linebreak_callback_base &operator<<(const + std::vector<unicode_char> + &vec) + { + return operator()(vec.begin(), vec.end()); + } + private: + virtual int operator()(int); + }; + + class linebreak_callback_save_buf : public linebreak_callback_base { + + public: + std::list<int> lb_buf; + + linebreak_callback_save_buf(); + ~linebreak_callback_save_buf(); + + private: + int operator()(int value); + }; + + /* + ** Convert an input iterator sequence over unicode_chars into + ** an input iterator sequence over linebreak values. + */ + + template<typename input_t> class linebreak_iter + : public std::iterator<std::input_iterator_tag, int, void> + { + mutable input_t iter_value, end_iter_value; + + mutable linebreak_callback_save_buf *buf; + + void fill() const + { + if (buf == NULL) + return; + + while (buf->lb_buf.empty()) + { + if (iter_value == end_iter_value) + { + buf->finish(); + if (buf->lb_buf.empty()) + { + delete buf; + buf=NULL; + } + break; + } + + buf->operator<<(*iter_value++); + } + } + + mutable value_type bufvalue; + + public: + linebreak_iter(const input_t &iter_valueArg, + const input_t &iter_endvalueArg) + : iter_value(iter_valueArg), + end_iter_value(iter_endvalueArg), + buf(new linebreak_callback_save_buf) + { + } + + linebreak_iter() : buf(NULL) + { + } + + void set_opts(int opts) + { + if (buf) + buf->set_opts(opts); + } + + ~linebreak_iter() + { + if (buf) + delete buf; + } + + linebreak_iter(const linebreak_iter<input_t> &v) + : buf(NULL) + { + operator=(v); + } + + linebreak_iter<input_t> &operator=(const + linebreak_iter<input_t> &v) + { + if (buf) + delete buf; + buf=v.buf; + iter_value=v.iter_value; + end_iter_value=v.end_iter_value; + v.buf=NULL; + return *this; + } + + bool operator==(const linebreak_iter<input_t> &v) const + { + fill(); + v.fill(); + + return buf == NULL && v.buf == NULL; + } + + bool operator!=(const linebreak_iter<input_t> &v) const + { + return !operator==(v); + } + + value_type operator*() const + { + fill(); + return buf == NULL ? UNICODE_LB_MANDATORY: + buf->lb_buf.front(); + } + + linebreak_iter<input_t> &operator++() + { + bufvalue=operator*(); + + if (buf) + buf->lb_buf.pop_front(); + return *this; + } + + const value_type *operator++(int) + { + operator++(); + return &bufvalue; + } + }; + + /* + ** Like linebreak_callback_base, except the subclass receives both + ** the linebreaking value, and the unicode character. + */ + + class linebreakc_callback_base { + + unicode_lbc_info_t handle; + + int opts; + + linebreakc_callback_base(const linebreakc_callback_base &); + /* NOT IMPLEMENTED */ + + linebreakc_callback_base &operator==(const + linebreakc_callback_base + &); + /* NOT IMPLEMENTED */ + + + public: + linebreakc_callback_base(); + virtual ~linebreakc_callback_base(); + + void finish(); + + void set_opts(int opts); + + friend int linebreakc_trampoline(int, unicode_char, void *); + + linebreakc_callback_base &operator<<(unicode_char uc); + + template<typename iter_type> + linebreakc_callback_base &operator()(iter_type beg_iter, + iter_type end_iter) + { + while (beg_iter != end_iter) + operator<<(*beg_iter++); + return *this; + } + + linebreakc_callback_base &operator<<(const + std::vector<unicode_char> + &vec) + { + return operator()(vec.begin(), vec.end()); + } + private: + virtual int operator()(int, unicode_char); + }; + + class linebreakc_callback_save_buf : public linebreakc_callback_base { + + public: + std::list<std::pair<int, unicode_char> > lb_buf; + + linebreakc_callback_save_buf(); + ~linebreakc_callback_save_buf(); + + private: + int operator()(int, unicode_char); + }; + + + /* + ** Convert an input iterator sequence over unicode_chars into + ** an input iterator sequence over std::pair<int, unicode_char>, + ** the original unicode character, and the linebreaking value before + ** the character. + */ + + template<typename input_t> class linebreakc_iter + : public std::iterator<std::input_iterator_tag, + std::pair<int, unicode_char>, void> + { + mutable input_t iter_value, end_iter_value; + + mutable linebreakc_callback_save_buf *buf; + + void fill() const + { + if (buf == NULL) + return; + + while (buf->lb_buf.empty()) + { + if (iter_value == end_iter_value) + { + buf->finish(); + if (buf->lb_buf.empty()) + { + delete buf; + buf=NULL; + } + break; + } + + buf->operator<<(*iter_value); + ++iter_value; + } + } + + mutable value_type bufvalue; + + public: + linebreakc_iter(const input_t &iter_valueArg, + const input_t &iter_endvalueArg) + : iter_value(iter_valueArg), + end_iter_value(iter_endvalueArg), + buf(new linebreakc_callback_save_buf) + { + } + + linebreakc_iter() : buf(NULL) + { + } + + ~linebreakc_iter() + { + if (buf) + delete buf; + } + + linebreakc_iter(const linebreakc_iter<input_t> &v) + : buf(NULL) + { + operator=(v); + } + + linebreakc_iter<input_t> &operator=(const + linebreakc_iter<input_t> &v) + { + if (buf) + delete buf; + buf=v.buf; + iter_value=v.iter_value; + end_iter_value=v.end_iter_value; + v.buf=NULL; + return *this; + } + + bool operator==(const linebreakc_iter<input_t> &v) const + { + fill(); + v.fill(); + + return buf == NULL && v.buf == NULL; + } + + bool operator!=(const linebreakc_iter<input_t> &v) const + { + return !operator==(v); + } + + value_type operator*() const + { + fill(); + return buf == NULL ? + std::make_pair(UNICODE_LB_MANDATORY, + (unicode_char)0): + buf->lb_buf.front(); + } + + linebreakc_iter<input_t> &operator++() + { + bufvalue=operator*(); + + if (buf) + buf->lb_buf.pop_front(); + return *this; + } + + const value_type *operator++(int) + { + operator++(); + return &bufvalue; + } + }; + + + /* + ** Subclass wordbreak_callback_base, implement operator()(int). + ** + ** Use operator<< or operator()(iterator, iterator) to feed + ** unicode_chars into the wordbreaking algorithm. The subclass receives + ** word flags, as they become available. + */ + + extern "C" int wordbreak_trampoline(int value, void *ptr); + + class wordbreak_callback_base { + + unicode_wb_info_t handle; + + wordbreak_callback_base(const wordbreak_callback_base &); + /* NOT IMPLEMENTED */ + + wordbreak_callback_base &operator==(const + wordbreak_callback_base &); + /* NOT IMPLEMENTED */ + + public: + wordbreak_callback_base(); + virtual ~wordbreak_callback_base(); + + void finish(); + + friend int wordbreak_trampoline(int, void *); + + wordbreak_callback_base &operator<<(unicode_char uc); + + template<typename iter_type> + wordbreak_callback_base &operator()(iter_type beg_iter, + iter_type end_iter) + { + while (beg_iter != end_iter) + operator<<(*beg_iter++); + return *this; + } + + wordbreak_callback_base &operator<<(const + std::vector<unicode_char> + &vec) + { + return operator()(vec.begin(), vec.end()); + } + private: + virtual int operator()(bool); + }; + + /* + ** A C++ wrapper for unicode_wbscan. + */ + + class wordbreakscan { + + unicode_wbscan_info_t handle; + + wordbreakscan(const wordbreakscan &); + /* NOT IMPLEMENTED */ + + wordbreakscan &operator==(const wordbreakscan &); + /* NOT IMPLEMENTED */ + public: + + wordbreakscan(); + ~wordbreakscan(); + + bool operator<<(unicode_char uc); + + size_t finish(); + }; + +} +#endif + +#endif |