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add range-based advancing encode funcs

master
Daniel Kolesa 2018-01-05 21:16:46 +01:00
parent 61ed0ce71f
commit daea42666e
1 changed files with 27 additions and 0 deletions
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27
ostd/string.hh
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@ -818,6 +818,15 @@ namespace utf {
return n;
}
template<typename R>
inline std::size_t encode_u8(R &sink, u32string_range &r) {
std::size_t n = 0;
if (!r.empty() && (n = utf::encode_u8(sink, r.front()))) {
r.pop_front();
}
return n;
}
/* @brief Encode a UTF-32 code point into UTF-16.
*
* The values are written in `sink` which is an ostd::output_range_tag.
@ -840,6 +849,15 @@ namespace utf {
return n;
}
template<typename R>
inline std::size_t encode_u16(R &sink, u32string_range &r) {
std::size_t n = 0;
if (!r.empty() && (n = utf::encode_u16(sink, r.front()))) {
r.pop_front();
}
return n;
}
/* @brief Encode a UTF-32 code point into a wide Unicode char/sequence.
*
* The value(s) are written in `sink` which is an ostd::output_range_tag.
@ -882,6 +900,15 @@ namespace utf {
return n;
}
template<typename R>
inline std::size_t encode_uw(R &sink, u32string_range &r) {
std::size_t n = 0;
if (!r.empty() && (n = utf::encode_uw(sink, r.front()))) {
r.pop_front();
}
return n;
}
/* @brief Get the number of Unicode code points in a string.
*
* This function keeps reading Unicode code points while it can and