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/** Internal string encodings support for libpqxx
*
* Copyright (c) 2000-2019, Jeroen T. Vermeulen.
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this mistake,
* or contact the author.
*/
#ifndef PQXX_H_ENCODINGS
#define PQXX_H_ENCODINGS
#include "pqxx/compiler-public.hxx"
#include "pqxx/compiler-internal-pre.hxx"
#include "pqxx/internal/encoding_group.hxx"
#include <string>
namespace pqxx
{
namespace internal
{
const char *name_encoding(int encoding_id);
/// Convert libpq encoding enum or encoding name to its libpqxx group.
encoding_group enc_group(int /* libpq encoding ID */);
encoding_group enc_group(const std::string&);
/// Function type: "find the end of the current glyph."
/** This type of function takes a text buffer, and a location in that buffer,
* and returns the location one byte past the end of the current glyph.
*
* The start offset marks the beginning of the current glyph. It must fall
* within the buffer.
*
* There are multiple different glyph scnaner implementations, for different
* kinds of encodings.
*/
using glyph_scanner_func =
std::string::size_type(
const char buffer[],
std::string::size_type buffer_len,
std::string::size_type start);
/// Look up the glyph scanner function for a given encoding group.
/** To identify the glyph boundaries in a buffer, call this to obtain the
* scanner function appropriate for the buffer's encoding. Then, repeatedly
* call the scanner function to find the glyphs.
*/
PQXX_LIBEXPORT glyph_scanner_func *get_glyph_scanner(encoding_group);
/// Find a single-byte "needle" character in a "haystack" text buffer.
std::string::size_type find_with_encoding(
encoding_group enc,
const std::string& haystack,
char needle,
std::string::size_type start = 0
);
PQXX_LIBEXPORT std::string::size_type find_with_encoding(
encoding_group enc,
const std::string& haystack,
const std::string& needle,
std::string::size_type start = 0
);
/// Iterate over the glyphs in a buffer.
/** Scans the glyphs in the buffer, and for each, passes its begin and its
* one-past-end pointers to @c callback.
*/
template<typename CALLABLE> PQXX_LIBEXPORT inline void for_glyphs(
encoding_group enc,
CALLABLE callback,
const char buffer[],
std::string::size_type buffer_len,
std::string::size_type start = 0
)
{
const auto scan = get_glyph_scanner(enc);
for (
std::string::size_type here = start, next;
here < buffer_len;
here = next
)
{
next = scan(buffer, buffer_len, here);
callback(buffer + here, buffer + next);
}
}
} // namespace pqxx::internal
} // namespace pqxx
#include "pqxx/compiler-internal-post.hxx"
#endif
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