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kakoune/src/selectors.cc
Olivier Perret b039a313a4 fix 'split' operation when the pattern occurs at the beginning 
Previously it would result in a stray single-character selection at the
beginning of the input text.

For example:
[abcabc] -> split on 'a' -> [a][bc]a[bc]
or
[foobarfoobar] -> split on 'foo' -> [f]oo[bar]foo[bar]

Note that this behavior was not occuring if the input text was at the
beginning of the buffer
2023-01-20 18:05:04 +01:00

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#include "selectors.hh"
#include "buffer_utils.hh"
#include "context.hh"
#include "flags.hh"
#include "option_types.hh"
#include "regex.hh"
#include "selection.hh"
#include "string.hh"
#include "unit_tests.hh"
#include "utf8_iterator.hh"
#include <algorithm>
namespace Kakoune
{
using Utf8Iterator = utf8::iterator<BufferIterator>;
namespace
{
Selection utf8_range(const BufferIterator& first, const BufferIterator& last)
{
return {first.coord(), last.coord()};
}
Selection utf8_range(const Utf8Iterator& first, const Utf8Iterator& last)
{
return {first.base().coord(), last.base().coord()};
}
ConstArrayView<Codepoint> get_extra_word_chars(const Context& context)
{
return context.options()["extra_word_chars"].get<Vector<Codepoint, MemoryDomain::Options>>();
}
}
Selection keep_direction(Selection res, const Selection& ref)
{
if ((res.cursor() < res.anchor()) != (ref.cursor() < ref.anchor()))
std::swap<BufferCoord>(res.cursor(), res.anchor());
return res;
}
template<WordType word_type>
Optional<Selection>
select_to_next_word(const Context& context, const Selection& selection)
{
auto extra_word_chars = get_extra_word_chars(context);
auto& buffer = context.buffer();
Utf8Iterator begin{buffer.iterator_at(selection.cursor()), buffer};
if (begin+1 == buffer.end())
return {};
if (categorize<word_type>(*begin, extra_word_chars) !=
categorize<word_type>(*(begin+1), extra_word_chars))
++begin;
if (not skip_while(begin, buffer.end(),
[](Codepoint c) { return is_eol(c); }))
return {};
Utf8Iterator end = begin+1;
auto is_word = [&](Codepoint c) { return Kakoune::is_word<word_type>(c, extra_word_chars); };
auto is_punctuation = [&](Codepoint c) { return Kakoune::is_punctuation(c, extra_word_chars); };
if (is_word(*begin))
skip_while(end, buffer.end(), is_word);
else if (is_punctuation(*begin))
skip_while(end, buffer.end(), is_punctuation);
skip_while(end, buffer.end(), is_horizontal_blank);
return utf8_range(begin, end-1);
}
template Optional<Selection> select_to_next_word<WordType::Word>(const Context&, const Selection&);
template Optional<Selection> select_to_next_word<WordType::WORD>(const Context&, const Selection&);
template<WordType word_type>
Optional<Selection>
select_to_next_word_end(const Context& context, const Selection& selection)
{
auto extra_word_chars = get_extra_word_chars(context);
auto& buffer = context.buffer();
Utf8Iterator begin{buffer.iterator_at(selection.cursor()), buffer};
if (begin+1 == buffer.end())
return {};
if (categorize<word_type>(*begin, extra_word_chars) !=
categorize<word_type>(*(begin+1), extra_word_chars))
++begin;
if (not skip_while(begin, buffer.end(),
[](Codepoint c) { return is_eol(c); }))
return {};
Utf8Iterator end = begin;
skip_while(end, buffer.end(), is_horizontal_blank);
auto is_word = [&](Codepoint c) { return Kakoune::is_word<word_type>(c, extra_word_chars); };
auto is_punctuation = [&](Codepoint c) { return Kakoune::is_punctuation(c, extra_word_chars); };
if (is_word(*end))
skip_while(end, buffer.end(), is_word);
else if (is_punctuation(*end))
skip_while(end, buffer.end(), is_punctuation);
return utf8_range(begin, end-1);
}
template Optional<Selection> select_to_next_word_end<WordType::Word>(const Context&, const Selection&);
template Optional<Selection> select_to_next_word_end<WordType::WORD>(const Context&, const Selection&);
template<WordType word_type>
Optional<Selection>
select_to_previous_word(const Context& context, const Selection& selection)
{
auto extra_word_chars = get_extra_word_chars(context);
auto& buffer = context.buffer();
Utf8Iterator begin{buffer.iterator_at(selection.cursor()), buffer};
if (begin == buffer.begin())
return {};
if (categorize<word_type>(*begin, extra_word_chars) !=
categorize<word_type>(*(begin-1), extra_word_chars))
--begin;
skip_while_reverse(begin, buffer.begin(), [](Codepoint c){ return is_eol(c); });
Utf8Iterator end = begin;
auto is_word = [&](Codepoint c) { return Kakoune::is_word<word_type>(c, extra_word_chars); };
auto is_punctuation = [&](Codepoint c) { return Kakoune::is_punctuation(c, extra_word_chars); };
bool with_end = skip_while_reverse(end, buffer.begin(), is_horizontal_blank);
if (is_word(*end))
with_end = skip_while_reverse(end, buffer.begin(), is_word);
else if (is_punctuation(*end))
with_end = skip_while_reverse(end, buffer.begin(), is_punctuation);
return utf8_range(begin, with_end ? end : end+1);
}
template Optional<Selection> select_to_previous_word<WordType::Word>(const Context&, const Selection&);
template Optional<Selection> select_to_previous_word<WordType::WORD>(const Context&, const Selection&);
template<WordType word_type>
Optional<Selection>
select_word(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto extra_word_chars = get_extra_word_chars(context);
auto& buffer = context.buffer();
auto is_word = [&](Codepoint c) { return Kakoune::is_word<word_type>(c, extra_word_chars); };
Utf8Iterator first{buffer.iterator_at(selection.cursor()), buffer};
if (not is_word(*first))
return {};
Utf8Iterator last = first;
if (flags & ObjectFlags::ToBegin)
{
skip_while_reverse(first, buffer.begin(), is_word);
if (not is_word(*first))
++first;
}
if (flags & ObjectFlags::ToEnd)
{
skip_while(last, buffer.end(), is_word);
if (not (flags & ObjectFlags::Inner))
skip_while(last, buffer.end(), is_horizontal_blank);
--last;
}
return (flags & ObjectFlags::ToEnd) ? utf8_range(first, last)
: utf8_range(last, first);
}
template Optional<Selection> select_word<WordType::Word>(const Context&, const Selection&, int, ObjectFlags);
template Optional<Selection> select_word<WordType::WORD>(const Context&, const Selection&, int, ObjectFlags);
template<bool only_move>
Optional<Selection>
select_to_line_end(const Context& context, const Selection& selection)
{
auto& buffer = context.buffer();
BufferCoord begin = selection.cursor();
LineCount line = begin.line;
BufferCoord end = utf8::previous(buffer.iterator_at({line, buffer[line].length() - 1}),
buffer.iterator_at(line)).coord();
if (end < begin) // Do not go backward when cursor is on eol
end = begin;
return Selection{only_move ? end : begin, {end, max_non_eol_column}};
}
template Optional<Selection> select_to_line_end<false>(const Context&, const Selection&);
template Optional<Selection> select_to_line_end<true>(const Context&, const Selection&);
template<bool only_move>
Optional<Selection>
select_to_line_begin(const Context&, const Selection& selection)
{
BufferCoord begin = selection.cursor();
BufferCoord end = begin.line;
return Selection{only_move ? end : begin, end};
}
template Optional<Selection> select_to_line_begin<false>(const Context&, const Selection&);
template Optional<Selection> select_to_line_begin<true>(const Context&, const Selection&);
Optional<Selection>
select_to_first_non_blank(const Context& context, const Selection& selection)
{
auto& buffer = context.buffer();
auto it = buffer.iterator_at(selection.cursor().line);
skip_while(it, buffer.iterator_at(selection.cursor().line+1),
is_horizontal_blank);
return {it.coord()};
}
template<bool forward>
Optional<Selection>
select_matching(const Context& context, const Selection& selection)
{
auto& buffer = context.buffer();
auto& matching_pairs = context.options()["matching_pairs"].get<Vector<Codepoint, MemoryDomain::Options>>();
Utf8Iterator it{buffer.iterator_at(selection.cursor()), buffer};
auto match = matching_pairs.end();
if (forward) while (it != buffer.end())
{
match = find(matching_pairs, *it);
if (match != matching_pairs.end())
break;
++it;
}
else while (true)
{
match = find(matching_pairs, *it);
if (match != matching_pairs.end()
or it == buffer.begin())
break;
--it;
}
if (match == matching_pairs.end())
return {};
Utf8Iterator begin = it;
if (((match - matching_pairs.begin()) % 2) == 0)
{
int level = 0;
const Codepoint opening = *match;
const Codepoint closing = *(match+1);
while (it != buffer.end())
{
if (*it == opening)
++level;
else if (*it == closing and --level == 0)
return utf8_range(begin, it);
++it;
}
}
else
{
int level = 0;
const Codepoint opening = *(match-1);
const Codepoint closing = *match;
while (true)
{
if (*it == closing)
++level;
else if (*it == opening and --level == 0)
return utf8_range(begin, it);
if (it == buffer.begin())
break;
--it;
}
}
return {};
}
template Optional<Selection>
select_matching<true>(const Context& context, const Selection& selection);
template Optional<Selection>
select_matching<false>(const Context& context, const Selection& selection);
template<typename Iterator, typename Container>
Optional<std::pair<Iterator, Iterator>>
find_opening(Iterator pos, const Container& container,
const Regex& opening, const Regex& closing,
int level, bool nestable)
{
MatchResults<Iterator> res;
// When on the token of a non-nestable block, we want to consider it opening
if (nestable and
backward_regex_search(container.begin(), pos,
container.begin(), container.end(), res, closing) and
res[0].second == pos)
pos = res[0].first;
using RegexIt = RegexIterator<Iterator, RegexMode::Backward>;
for (auto&& match : RegexIt{container.begin(), pos, container.begin(), container.end(), opening})
{
if (nestable)
{
for (auto m [[maybe_unused]] : RegexIt{match[0].second, pos, container.begin(), container.end(), closing})
++level;
}
if (not nestable or level == 0)
return match[0];
pos = match[0].first;
--level;
}
return {};
}
template<typename Iterator, typename Container>
Optional<std::pair<Iterator, Iterator>>
find_closing(Iterator pos, const Container& container,
const Regex& opening, const Regex& closing,
int level, bool nestable)
{
using RegexIt = RegexIterator<Iterator, RegexMode::Forward>;
for (auto match : RegexIt{pos, container.end(), container.begin(), container.end(), closing})
{
if (nestable)
{
for (auto m [[maybe_unused]] : RegexIt{pos, match[0].first, container.begin(), container.end(), opening})
++level;
}
if (not nestable or level == 0)
return match[0];
pos = match[0].second;
--level;
}
return {};
}
template<typename Container, typename Iterator>
Optional<std::pair<Iterator, Iterator>>
find_surrounding(const Container& container, Iterator pos,
const Regex& opening, const Regex& closing,
ObjectFlags flags, int level)
{
auto empty = [](const std::pair<Iterator, Iterator>& m) { return m.first == m.second; };
const bool nestable = opening != closing;
auto first = pos;
auto last = pos;
if (flags & ObjectFlags::ToBegin)
{
if (auto res = find_opening(first+1, container, opening, closing, level, nestable))
{
first = (flags & ObjectFlags::Inner) ? res->second : res->first;
if (flags & ObjectFlags::ToEnd) // ensure we find the matching end
{
last = empty(*res) ? std::next(res->second) : res->second;
level = 0;
}
}
else
return {};
}
else if (MatchResults<Iterator> res;
regex_search(pos, container.end(), container.begin(), container.end(), res, opening) and
res[0].first == pos) // Skip opening match if pos lies on it
last = empty(res[0]) ? std::next(res[0].second) : res[0].second;
if (flags & ObjectFlags::ToEnd)
{
if (auto res = find_closing(last, container, opening, closing, level, nestable))
last = utf8::previous((flags & ObjectFlags::Inner) ? res->first : res->second,
container.begin());
else
return {};
}
if (first > last)
last = first;
return std::pair<Iterator, Iterator>{first, last};
}
Optional<Selection>
select_surrounding(const Context& context, const Selection& selection,
const Regex& opening, const Regex& closing, int level,
ObjectFlags flags)
{
auto& buffer = context.buffer();
auto pos = buffer.iterator_at(selection.cursor());
auto res = find_surrounding(buffer, pos, opening, closing, flags, level);
// If the ends we're changing didn't move, find the parent
if (res and not (flags & ObjectFlags::Inner) and
(res->first.coord() == selection.min() or not (flags & ObjectFlags::ToBegin)) and
(res->second.coord() == selection.max() or not (flags & ObjectFlags::ToEnd)))
res = find_surrounding(buffer, pos, opening, closing, flags, level+1);
if (res)
return (flags & ObjectFlags::ToEnd) ? utf8_range(res->first, res->second)
: utf8_range(res->second, res->first);
return {};
}
Optional<Selection>
select_to(const Context& context, const Selection& selection,
Codepoint c, int count, bool inclusive)
{
auto& buffer = context.buffer();
Utf8Iterator begin{buffer.iterator_at(selection.cursor()), buffer};
Utf8Iterator end = begin;
do
{
++end;
skip_while(end, buffer.end(), [c](Codepoint cur) { return cur != c; });
if (end == buffer.end())
return {};
}
while (--count > 0);
return utf8_range(begin, inclusive ? end : end-1);
}
Optional<Selection>
select_to_reverse(const Context& context, const Selection& selection,
Codepoint c, int count, bool inclusive)
{
auto& buffer = context.buffer();
Utf8Iterator begin{buffer.iterator_at(selection.cursor()), buffer};
Utf8Iterator end = begin;
do
{
--end;
if (skip_while_reverse(end, buffer.begin(),
[c](Codepoint cur) { return cur != c; }))
return {};
}
while (--count > 0);
return utf8_range(begin, inclusive ? end : end+1);
}
Optional<Selection>
select_number(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto is_number = [&](char c) {
return (c >= '0' and c <= '9') or
(not (flags & ObjectFlags::Inner) and c == '.');
};
auto& buffer = context.buffer();
BufferIterator first = buffer.iterator_at(selection.cursor());
BufferIterator last = first;
if (not is_number(*first) and *first != '-')
return {};
if (flags & ObjectFlags::ToBegin)
{
skip_while_reverse(first, buffer.begin(), is_number);
if (not is_number(*first) and *first != '-' and
first+1 != buffer.end())
++first;
}
if (flags & ObjectFlags::ToEnd)
{
if (*last == '-')
++last;
skip_while(last, buffer.end(), is_number);
if (last != buffer.begin())
--last;
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
Optional<Selection>
select_sentence(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto is_end_of_sentence = [](char c) {
return c == '.' or c == ';' or c == '!' or c == '?';
};
auto& buffer = context.buffer();
BufferIterator first = buffer.iterator_at(selection.cursor());
BufferIterator last;
for (int i = 0; i <= count; ++i)
{
if (not (flags & ObjectFlags::ToEnd) and first != buffer.begin())
{
BufferIterator prev_non_blank = first-1;
skip_while_reverse(prev_non_blank, buffer.begin(),
[](char c) { return is_horizontal_blank(c) or is_eol(c); });
if (is_end_of_sentence(*prev_non_blank))
first = prev_non_blank;
}
if (i == 0)
last = first;
if (flags & ObjectFlags::ToBegin)
{
bool saw_non_blank = false;
while (first != buffer.begin())
{
char cur = *first;
char prev = *(first-1);
if (not is_horizontal_blank(cur))
saw_non_blank = true;
if (is_eol(prev) and is_eol(cur) and first + 1 != buffer.end())
{
++first;
break;
}
else if (is_end_of_sentence(prev))
{
if (saw_non_blank)
break;
else if (flags & ObjectFlags::ToEnd)
last = first-1;
}
--first;
}
skip_while(first, buffer.end(), is_horizontal_blank);
}
if (flags & ObjectFlags::ToEnd)
{
while (last != buffer.end())
{
char cur = *last;
if (is_end_of_sentence(cur) or
(is_eol(cur) and (last+1 == buffer.end() or is_eol(*(last+1)))))
break;
++last;
}
if (not (flags & ObjectFlags::Inner) and last != buffer.end())
{
++last;
skip_while(last, buffer.end(), is_horizontal_blank);
--last;
}
}
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
Optional<Selection>
select_paragraph(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto& buffer = context.buffer();
BufferIterator first = buffer.iterator_at(selection.cursor());
BufferIterator last;
for (int i = 0; i <= count; ++i)
{
if (not (flags & ObjectFlags::ToEnd) and first.coord() > BufferCoord{0,1} and
is_eol(*(first-1)) and first-1 != buffer.begin() and is_eol(*(first-2)))
--first;
else if ((flags & ObjectFlags::ToEnd) and
first != buffer.begin() and (first+1) != buffer.end() and
is_eol(*(first-1)) and is_eol(*first))
++first;
if (i == 0)
last = first;
if ((flags & ObjectFlags::ToBegin) and first != buffer.begin())
{
skip_while_reverse(first, buffer.begin(),
[](Codepoint c){ return is_eol(c); });
if (flags & ObjectFlags::ToEnd)
last = first;
while (first != buffer.begin())
{
char cur = *first;
char prev = *(first-1);
if (is_eol(prev) and is_eol(cur))
{
++first;
break;
}
--first;
}
}
if (flags & ObjectFlags::ToEnd)
{
if (last != buffer.end() and is_eol(*last))
++last;
while (last != buffer.end())
{
if (last != buffer.begin() and is_eol(*last) and is_eol(*(last-1)))
{
if (not (flags & ObjectFlags::Inner))
skip_while(last, buffer.end(),
[](Codepoint c){ return is_eol(c); });
break;
}
++last;
}
--last;
}
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
Optional<Selection>
select_whitespaces(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto is_whitespace = [&](char c) {
return c == ' ' or c == '\t' or
(not (flags & ObjectFlags::Inner) and c == '\n');
};
auto& buffer = context.buffer();
BufferIterator first = buffer.iterator_at(selection.cursor());
BufferIterator last = first;
if (not is_whitespace(*first))
return {};
if (flags & ObjectFlags::ToBegin)
{
if (is_whitespace(*first))
{
skip_while_reverse(first, buffer.begin(), is_whitespace);
if (not is_whitespace(*first))
++first;
}
}
if (flags & ObjectFlags::ToEnd)
{
if (is_whitespace(*last))
{
skip_while(last, buffer.end(), is_whitespace);
--last;
}
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
Optional<Selection>
select_indent(const Context& context, const Selection& selection,
int count, ObjectFlags flags)
{
auto get_indent = [](StringView str, int tabstop) {
CharCount indent = 0;
for (auto& c : str)
{
if (c == ' ')
++indent;
else if (c =='\t')
indent = (indent / tabstop + 1) * tabstop;
else
break;
}
return indent;
};
auto get_current_indent = [&](const Buffer& buffer, LineCount line, int tabstop)
{
for (auto l = line; l >= 0; --l)
if (buffer[l] != "\n"_sv)
return get_indent(buffer[l], tabstop);
for (auto l = line+1; l < buffer.line_count(); ++l)
if (buffer[l] != "\n"_sv)
return get_indent(buffer[l], tabstop);
return 0_char;
};
auto is_only_whitespaces = [](StringView str) {
auto it = str.begin();
skip_while(it, str.end(),
[](char c){ return c == ' ' or c == '\t' or c == '\n'; });
return it == str.end();
};
const bool to_begin = flags & ObjectFlags::ToBegin;
const bool to_end = flags & ObjectFlags::ToEnd;
auto& buffer = context.buffer();
int tabstop = context.options()["tabstop"].get<int>();
auto pos = selection.cursor();
const LineCount line = pos.line;
const auto indent = get_current_indent(buffer, line, tabstop);
LineCount begin_line = line - 1;
if (to_begin)
{
while (begin_line >= 0 and (buffer[begin_line] == "\n"_sv or
get_indent(buffer[begin_line], tabstop) >= indent))
--begin_line;
}
++begin_line;
LineCount end_line = line + 1;
if (to_end)
{
const LineCount end = buffer.line_count();
while (end_line < end and (buffer[end_line] == "\n"_sv or
get_indent(buffer[end_line], tabstop) >= indent))
++end_line;
}
--end_line;
// remove only whitespaces lines in inner mode
if (flags & ObjectFlags::Inner)
{
while (begin_line < end_line and
is_only_whitespaces(buffer[begin_line]))
++begin_line;
while (begin_line < end_line and
is_only_whitespaces(buffer[end_line]))
--end_line;
}
auto first = to_begin ? begin_line : pos;
auto last = to_end ? BufferCoord{end_line, buffer[end_line].length() - 1} : pos;
return to_end ? Selection{first, last} : Selection{last, first};
}
Optional<Selection>
select_argument(const Context& context, const Selection& selection,
int level, ObjectFlags flags)
{
enum Class { None, Opening, Closing, Delimiter };
auto classify = [](Codepoint c) {
switch (c)
{
case '(': case '[': case '{': return Opening;
case ')': case ']': case '}': return Closing;
case ',': case ';': return Delimiter;
default: return None;
}
};
auto& buffer = context.buffer();
BufferIterator pos = buffer.iterator_at(selection.cursor());
switch (classify(*pos))
{
//case Closing: if (pos+1 != buffer.end()) ++pos; break;
case Opening:
case Delimiter: if (pos != buffer.begin()) --pos; break;
default: break;
};
bool first_arg = false;
BufferIterator begin = pos;
for (int lev = level; begin != buffer.begin(); --begin)
{
Class c = classify(*begin);
if (c == Closing)
++lev;
else if (c == Opening and (lev-- == 0))
{
first_arg = true;
++begin;
break;
}
else if (c == Delimiter and lev == 0)
{
++begin;
break;
}
}
bool last_arg = false;
BufferIterator end = pos;
for (int lev = level; end != buffer.end(); ++end)
{
Class c = classify(*end);
if (c == Opening)
++lev;
else if (end != pos and c == Closing and (lev-- == 0))
{
last_arg = true;
--end;
break;
}
else if (c == Delimiter and lev == 0)
{
// include whitespaces *after* the delimiter only for first argument
if (first_arg and not (flags & ObjectFlags::Inner))
{
while (end + 1 != buffer.end() and is_blank(*(end+1)))
++end;
}
break;
}
}
if (flags & ObjectFlags::Inner)
{
if (not last_arg)
--end;
skip_while(begin, end, is_blank);
skip_while_reverse(end, begin, is_blank);
}
// get starting delimiter for non inner last arg
else if (not first_arg and last_arg and begin != buffer.begin())
--begin;
if (end == buffer.end())
--end;
if (flags & ObjectFlags::ToBegin and not (flags & ObjectFlags::ToEnd))
return Selection{pos.coord(), begin.coord()};
return Selection{(flags & ObjectFlags::ToBegin ? begin : pos).coord(),
end.coord()};
}
Optional<Selection>
select_lines(const Context& context, const Selection& selection)
{
auto& buffer = context.buffer();
BufferCoord anchor = selection.anchor();
BufferCoord cursor = selection.cursor();
BufferCoord& to_line_start = anchor <= cursor ? anchor : cursor;
BufferCoord& to_line_end = anchor <= cursor ? cursor : anchor;
to_line_start.column = 0;
to_line_end.column = buffer[to_line_end.line].length()-1;
return Selection{anchor, {cursor, max_column}};
}
Optional<Selection>
trim_partial_lines(const Context& context, const Selection& selection)
{
auto& buffer = context.buffer();
BufferCoord anchor = selection.anchor();
BufferCoord cursor = selection.cursor();
BufferCoord& to_line_start = anchor <= cursor ? anchor : cursor;
BufferCoord& to_line_end = anchor <= cursor ? cursor : anchor;
if (to_line_start.column != 0)
to_line_start = to_line_start.line+1;
if (to_line_end.column != buffer[to_line_end.line].length()-1)
{
if (to_line_end.line == 0)
return {};
auto prev_line = to_line_end.line-1;
to_line_end = BufferCoord{ prev_line, buffer[prev_line].length()-1 };
}
if (to_line_start > to_line_end)
return {};
return Selection{anchor, {cursor, max_column}};
}
static RegexExecFlags
match_flags(const Buffer& buf, const BufferIterator& begin, const BufferIterator& end)
{
return match_flags(is_bol(begin.coord()), is_eol(buf, end.coord()),
is_bow(buf, begin.coord()), is_eow(buf, end.coord()));
}
static bool find_next(const Buffer& buffer, const BufferIterator& pos,
MatchResults<BufferIterator>& matches,
const Regex& ex, bool& wrapped)
{
if (pos != buffer.end() and
regex_search(pos, buffer.end(), buffer.begin(), buffer.end(),
matches, ex, match_flags(buffer, pos, buffer.end())))
return true;
wrapped = true;
return regex_search(buffer.begin(), buffer.end(), buffer.begin(), buffer.end(),
matches, ex, match_flags(buffer, buffer.begin(), buffer.end()));
}
static bool find_prev(const Buffer& buffer, const BufferIterator& pos,
MatchResults<BufferIterator>& matches,
const Regex& ex, bool& wrapped)
{
if (pos != buffer.begin() and
backward_regex_search(buffer.begin(), pos, buffer.begin(), buffer.end(),
matches, ex,
match_flags(buffer, buffer.begin(), pos) |
RegexExecFlags::NotInitialNull))
return true;
wrapped = true;
return backward_regex_search(buffer.begin(), buffer.end(), buffer.begin(), buffer.end(),
matches, ex,
match_flags(buffer, buffer.begin(), buffer.end()) |
RegexExecFlags::NotInitialNull);
}
template<RegexMode mode>
Selection find_next_match(const Context& context, const Selection& sel, const Regex& regex, bool& wrapped)
{
static_assert(is_direction(mode));
constexpr bool forward = mode & RegexMode::Forward;
auto& buffer = context.buffer();
MatchResults<BufferIterator> matches;
auto pos = buffer.iterator_at(forward ? sel.max() : sel.min());
wrapped = false;
const bool found = forward ?
find_next(buffer, utf8::next(pos, buffer.end()), matches, regex, wrapped)
: find_prev(buffer, pos, matches, regex, wrapped);
if (not found or matches[0].first == buffer.end())
throw runtime_error(format("no matches found: '{}'", regex.str()));
CaptureList captures;
for (const auto& match : matches)
captures.push_back(buffer.string(match.first.coord(), match.second.coord()));
auto begin = matches[0].first, end = matches[0].second;
end = (begin == end) ? end : utf8::previous(end, begin);
if (not forward)
std::swap(begin, end);
return {begin.coord(), end.coord(), std::move(captures)};
}
template Selection find_next_match<RegexMode::Forward>(const Context&, const Selection&, const Regex&, bool&);
template Selection find_next_match<RegexMode::Backward>(const Context&, const Selection&, const Regex&, bool&);
Vector<Selection> select_matches(const Buffer& buffer, ConstArrayView<Selection> selections, const Regex& regex, int capture_idx)
{
const int mark_count = (int)regex.mark_count();
if (capture_idx < 0 or capture_idx > mark_count)
throw runtime_error("invalid capture number");
Vector<Selection> result;
ThreadedRegexVM<BufferIterator, RegexMode::Forward | RegexMode::Search> vm{*regex.impl()};
for (auto& sel : selections)
{
auto sel_beg = buffer.iterator_at(sel.min());
auto sel_end = utf8::next(buffer.iterator_at(sel.max()), buffer.end());
for (auto&& match : RegexIterator{sel_beg, sel_end, vm, match_flags(buffer, sel_beg, sel_end)})
{
auto capture = match[capture_idx];
if (not capture.matched or capture.first == sel_end)
continue;
CaptureList captures;
captures.reserve(mark_count);
for (const auto& submatch : match)
captures.push_back(buffer.string(submatch.first.coord(),
submatch.second.coord()));
auto begin = capture.first, end = capture.second;
kak_assert(result.empty() or begin.coord() >= result.back().min());
result.push_back(
keep_direction({ begin.coord(),
(begin == end ? end : utf8::previous(end, begin)).coord(),
std::move(captures) }, sel));
}
}
if (result.empty())
throw runtime_error("nothing selected");
return result;
}
Vector<Selection> split_on_matches(const Buffer& buffer, ConstArrayView<Selection> selections, const Regex& regex, int capture_idx)
{
if (capture_idx < 0 or capture_idx > (int)regex.mark_count())
throw runtime_error("invalid capture number");
Vector<Selection> result;
auto buf_end = buffer.end();
auto buf_begin = buffer.begin();
ThreadedRegexVM<BufferIterator, RegexMode::Forward | RegexMode::Search> vm{*regex.impl()};
for (auto& sel : selections)
{
auto sel_begin = buffer.iterator_at(sel.min());
auto begin = sel_begin;
auto sel_end = utf8::next(buffer.iterator_at(sel.max()), buf_end);
for (auto&& match : RegexIterator{begin, sel_end, vm, match_flags(buffer, begin, sel_end)})
{
auto capture = match[capture_idx];
BufferIterator end = capture.first;
if (end == buf_end)
continue;
if (end != sel_begin)
{
auto sel_end = (begin == end) ? end : utf8::previous(end, begin);
result.push_back(keep_direction({ begin.coord(), sel_end.coord() }, sel));
}
begin = capture.second;
}
if (begin.coord() <= sel.max())
result.push_back(keep_direction({ begin.coord(), sel.max() }, sel));
}
if (result.empty())
throw runtime_error("nothing selected");
return result;
}
UnitTest test_find_surrounding{[]()
{
StringView s = "{foo [bar { baz[] }]}";
auto check_equal = [&](const char* pos, StringView opening, StringView closing,
ObjectFlags flags, int level, StringView expected) {
auto res = find_surrounding(s, pos,
Regex{"\\Q" + opening, RegexCompileFlags::Backward},
Regex{"\\Q" + closing, RegexCompileFlags::Backward},
flags, level);
kak_assert(res);
auto min = std::min(res->first, res->second),
max = std::max(res->first, res->second);
kak_assert(StringView{min, max+1} == expected);
};
check_equal(s.begin() + 13, '{', '}', ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, "{ baz[] }");
check_equal(s.begin() + 13, '[', ']', ObjectFlags::ToBegin | ObjectFlags::ToEnd | ObjectFlags::Inner, 0, "bar { baz[] }");
check_equal(s.begin() + 5, '[', ']', ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, "[bar { baz[] }]");
check_equal(s.begin() + 10, '{', '}', ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, "{ baz[] }");
check_equal(s.begin() + 16, '[', ']', ObjectFlags::ToBegin | ObjectFlags::ToEnd | ObjectFlags::Inner, 0, "]");
check_equal(s.begin() + 18, '[', ']', ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, "[bar { baz[] }]");
check_equal(s.begin() + 6, '[', ']', ObjectFlags::ToBegin, 0, "[b");
s = "[*][] foo";
kak_assert(not find_surrounding(s, s.begin() + 6,
Regex{"\\Q[", RegexCompileFlags::Backward},
Regex{"\\Q]", RegexCompileFlags::Backward},
ObjectFlags::ToBegin, 0));
s = "begin foo begin bar end end";
check_equal(s.begin() + 6, "begin", "end", ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, s);
check_equal(s.begin() + 22, "begin", "end", ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0, "begin bar end");
}};
}
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