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70 lines
2.9 KiB
C++
70 lines
2.9 KiB
C++
// Helper functions for working with wcstring.
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#ifndef FISH_WCSTRINGUTIL_H
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#define FISH_WCSTRINGUTIL_H
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#include <algorithm>
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#include <string>
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#include <utility>
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#include "common.h"
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/// @typedef wcstring_range represents a range in a wcstring.
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/// The first element is the location, the second is the count.
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typedef std::pair<wcstring::size_type, wcstring::size_type> wcstring_range;
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/// wcstring equivalent of wcstok(). Supports NUL. For convenience and wcstok() compatibility, the
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/// first character of each token separator is replaced with NUL.
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/// @return Returns a pair of (pos, count).
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/// This will be (npos, npos) when it's done. In the form of (pos, npos)
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/// when the token is already known to be the final token.
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/// @note The final token may not necessarily return (pos, npos).
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wcstring_range wcstring_tok(wcstring& str, const wcstring& needle,
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wcstring_range last = wcstring_range(0, 0));
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/// Given iterators into a string (forward or reverse), splits the haystack iterators
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/// about the needle sequence, up to max times. Inserts splits into the output array.
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/// If the iterators are forward, this does the normal thing.
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/// If the iterators are backward, this returns reversed strings, in reversed order!
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/// If the needle is empty, split on individual elements (characters).
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/// Max output entries will be max + 1 (after max splits)
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template <typename ITER>
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void split_about(ITER haystack_start, ITER haystack_end, ITER needle_start, ITER needle_end,
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wcstring_list_t* output, long max = LONG_MAX, bool no_empty = false) {
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long remaining = max;
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ITER haystack_cursor = haystack_start;
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while (remaining > 0 && haystack_cursor != haystack_end) {
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ITER split_point;
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if (needle_start == needle_end) { // empty needle, we split on individual elements
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split_point = haystack_cursor + 1;
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} else {
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split_point = std::search(haystack_cursor, haystack_end, needle_start, needle_end);
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}
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if (split_point == haystack_end) { // not found
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break;
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}
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if (!no_empty || haystack_cursor != split_point) {
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output->emplace_back(haystack_cursor, split_point);
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}
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remaining--;
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// Need to skip over the needle for the next search note that the needle may be empty.
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haystack_cursor = split_point + std::distance(needle_start, needle_end);
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}
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// Trailing component, possibly empty.
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if (!no_empty || haystack_cursor != haystack_end) {
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output->emplace_back(haystack_cursor, haystack_end);
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}
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}
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enum class ellipsis_type {
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None,
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//Prefer niceness over minimalness
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Prettiest,
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//Make every character count ($ instead of ...)
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Shortest,
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};
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wcstring truncate(const wcstring &input, int max_len, ellipsis_type etype = ellipsis_type::Prettiest);
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wcstring trim(const wcstring &input, const wchar_t *any_of);
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#endif
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