UNICODE::CANONICAL(3)

NAME
unicode::canonical, unicode::decompose, unicode::decompose_default_reallocate, unicode::compose, unicode::compose_default_callback - unicode canonical normalization and denormalization

SYNOPSIS

#include <courier-unicode.h>

constexpr int decompose_flag_qc=UNICODE_DECOMPOSE_FLAG_QC;
constexpr int decompose_flag_compat=UNICODE_DECOMPOSE_FLAG_COMPAT;

constexpr int compose_flag_removeunused=UNICODE_COMPOSE_FLAG_REMOVEUNUSED;
constexpr int compose_flag_oneshot=UNICODE_COMPOSE_FLAG_ONESHOT;

void decompose_default_reallocate(std::u32string &string, const std::vector<std::tuple<size_t, size_t>> &list);

void decompose(std::u32string &string, int flags=0, const std::function<void (std::u32string &, const std::vector<std::tuple<size_t, size_t>>)> &reallocate=decompose_default_reallocate);

void compose_default_callback(unicode_composition_t &compositions);

void compose(std::u32string &string, int flags=0, const std::function<void (unicode_composition_t &)> &cb=compose_default_reallocate);

DESCRIPTION

These functions implement the C++ interface for the Unicode Canonical Decomposition and Composition[1], See the description of the underlying unicode_canonical(3) C library API for more information. C++ specific notes:

    • The C++ decomposition reallocate callback receives a single vector of offset and size tuples instead of two separate arrays or vectors. unicode::decompose_default_reallocate() is the C++ version of the default reallocate callback. It receives the receiving the same tuple vector parameter, too. The C++ interface use std::u32strings to represent Unicode text strings, and unicode::decompose_default_reallocate() resizes it.

    Like the C callback, the C++ one gets called 0 or more times.

    • unicode::compose() takes care of initializing, applying, and de-initialization the unicode_composition_t object, for decomposition. The callback receives a reference to the unicode_composition_t object, which the callback should not modify in any way.

SEE ALSO

courier-unicode(7), unicode_canonical(3).

AUTHOR

Sam Varshavchik
    Author

NOTES

1.  Unicode Canonical Decomposition and Composition
    https://www.unicode.org/reports/tr15/tr15-56.html