home/src/selectors.cc
2014-07-10 19:22:14 +01:00

549 lines
17 KiB
C++

#include "selectors.hh"
#include "optional.hh"
#include "string.hh"
#include <algorithm>
namespace Kakoune
{
Selection select_line(const Buffer& buffer, const Selection& selection)
{
Utf8Iterator first = buffer.iterator_at(selection.cursor());
if (*first == '\n' and first + 1 != buffer.end())
++first;
while (first != buffer.begin() and *(first - 1) != '\n')
--first;
Utf8Iterator last = first;
while (last + 1 != buffer.end() and *last != '\n')
++last;
return utf8_range(first, last);
}
Selection select_matching(const Buffer& buffer, const Selection& selection)
{
std::vector<Codepoint> matching_pairs = { '(', ')', '{', '}', '[', ']', '<', '>' };
Utf8Iterator it = buffer.iterator_at(selection.cursor());
std::vector<Codepoint>::iterator match = matching_pairs.end();
while (not is_eol(*it))
{
match = std::find(matching_pairs.begin(), matching_pairs.end(), *it);
if (match != matching_pairs.end())
break;
++it;
}
if (match == matching_pairs.end())
return selection;
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 selection;
}
static Optional<Selection> find_surrounding(const Buffer& buffer,
ByteCoord coord,
CodepointPair matching,
ObjectFlags flags, int init_level)
{
const bool to_begin = flags & ObjectFlags::ToBegin;
const bool to_end = flags & ObjectFlags::ToEnd;
const bool nestable = matching.first != matching.second;
auto pos = buffer.iterator_at(coord);
Utf8Iterator first = pos;
if (to_begin)
{
int level = nestable ? init_level : 0;
while (first != buffer.begin())
{
if (nestable and first != pos and *first == matching.second)
++level;
else if (*first == matching.first)
{
if (level == 0)
break;
else
--level;
}
--first;
}
if (level != 0 or *first != matching.first)
return Optional<Selection>{};
}
Utf8Iterator last = pos;
if (to_end)
{
int level = nestable ? init_level : 0;
while (last != buffer.end())
{
if (nestable and last != pos and *last == matching.first)
++level;
else if (*last == matching.second)
{
if (level == 0)
break;
else
--level;
}
++last;
}
if (level != 0 or last == buffer.end())
return Optional<Selection>{};
}
if (flags & ObjectFlags::Inner)
{
if (to_begin and first != last)
++first;
if (to_end and first != last)
--last;
}
return to_end ? utf8_range(first, last) : utf8_range(last, first);
}
Selection select_surrounding(const Buffer& buffer, const Selection& selection,
CodepointPair matching, int level,
ObjectFlags flags)
{
const bool nestable = matching.first != matching.second;
auto pos = selection.cursor();
if (not nestable or flags & ObjectFlags::Inner)
{
if (auto res = find_surrounding(buffer, pos, matching, flags, level))
return *res;
return selection;
}
auto c = buffer.byte_at(pos);
if ((flags == ObjectFlags::ToBegin and c == matching.first) or
(flags == ObjectFlags::ToEnd and c == matching.second))
++level;
auto res = find_surrounding(buffer, pos, matching, flags, level);
if (not res)
return selection;
if (flags == (ObjectFlags::ToBegin | ObjectFlags::ToEnd) and
res->min() == selection.min() and res->max() == selection.max())
{
if (auto res_parent = find_surrounding(buffer, pos, matching, flags, level+1))
return Selection{*res_parent};
}
return *res;
}
Selection select_to(const Buffer& buffer, const Selection& selection,
Codepoint c, int count, bool inclusive)
{
Utf8Iterator begin = buffer.iterator_at(selection.cursor());
Utf8Iterator end = begin;
do
{
++end;
skip_while(end, buffer.end(), [c](Codepoint cur) { return cur != c; });
if (end == buffer.end())
return selection;
}
while (--count > 0);
return utf8_range(begin, inclusive ? end : end-1);
}
Selection select_to_reverse(const Buffer& buffer, const Selection& selection,
Codepoint c, int count, bool inclusive)
{
Utf8Iterator begin = buffer.iterator_at(selection.cursor());
Utf8Iterator end = begin;
do
{
--end;
skip_while_reverse(end, buffer.begin(), [c](Codepoint cur) { return cur != c; });
if (end == buffer.begin())
return selection;
}
while (--count > 0);
return utf8_range(begin, inclusive ? end : end+1);
}
Selection select_to_eol(const Buffer& buffer, const Selection& selection)
{
Utf8Iterator begin = buffer.iterator_at(selection.cursor());
Utf8Iterator end = begin;
skip_while(end, buffer.end(), [](Codepoint cur) { return not is_eol(cur); });
return utf8_range(begin, end != begin ? end-1 : end);
}
Selection select_to_eol_reverse(const Buffer& buffer, const Selection& selection)
{
Utf8Iterator begin = buffer.iterator_at(selection.cursor());
Utf8Iterator end = begin - 1;
skip_while_reverse(end, buffer.begin(), [](Codepoint cur) { return not is_eol(cur); });
return utf8_range(begin, end == buffer.begin() ? end : end+1);
}
Selection select_number(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
{
auto is_number = [&](char c) {
return (c >= '0' and c <= '9') or
(not (flags & ObjectFlags::Inner) and c == '.');
};
BufferIterator first = buffer.iterator_at(selection.cursor());
if (flags & ObjectFlags::ToBegin)
{
skip_while_reverse(first, buffer.begin(), is_number);
if (not is_number(*first) and *first != '-')
++first;
}
BufferIterator last = buffer.iterator_at(selection.cursor());
if (flags & ObjectFlags::ToEnd)
{
skip_while(last, buffer.end(), is_number);
--last;
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
static bool is_end_of_sentence(char c)
{
return c == '.' or c == ';' or c == '!' or c == '?';
}
Selection select_sentence(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
{
BufferIterator first = buffer.iterator_at(selection.cursor());
if (not (flags & ObjectFlags::ToEnd))
{
BufferIterator prev_non_blank = first-1;
skip_while_reverse(prev_non_blank, buffer.begin(),
[](char c) { return is_blank(c) or is_eol(c); });
if (is_end_of_sentence(*prev_non_blank))
first = prev_non_blank;
}
BufferIterator 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_blank(cur))
saw_non_blank = true;
if (is_eol(prev) and is_eol(cur))
{
++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_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_blank);
--last;
}
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
Selection select_paragraph(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
{
BufferIterator first = buffer.iterator_at(selection.cursor());
if (not (flags & ObjectFlags::ToEnd) and first.coord() > ByteCoord{0,1} and
*(first-1) == '\n' and *(first-2) == '\n')
--first;
else if ((flags & ObjectFlags::ToEnd) and
first != buffer.begin() and (first+1) != buffer.end() and
*(first-1) == '\n' and *first == '\n')
++first;
BufferIterator last = first;
if ((flags & ObjectFlags::ToBegin) and first != buffer.begin())
{
skip_while_reverse(first, buffer.begin(), is_eol);
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() && 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(), is_eol);
break;
}
++last;
}
--last;
}
return (flags & ObjectFlags::ToEnd) ? Selection{first.coord(), last.coord()}
: Selection{last.coord(), first.coord()};
}
static CharCount get_indent(const String& 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;
}
Selection select_whitespaces(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
{
auto is_whitespace = [&](char c) {
return c == ' ' or c == '\t' or
(not (flags & ObjectFlags::Inner) and c == '\n');
};
BufferIterator first = buffer.iterator_at(selection.cursor());
BufferIterator last = first;
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) ? utf8_range(first, last)
: utf8_range(last, first);
}
static bool is_only_whitespaces(const String& str)
{
auto it = str.begin();
skip_while(it, str.end(),
[](char c){ return c == ' ' or c == '\t' or c == '\n'; });
return it == str.end();
}
Selection select_indent(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
{
int tabstop = buffer.options()["tabstop"].get<int>();
LineCount line = selection.cursor().line;
auto indent = get_indent(buffer[line], tabstop);
LineCount begin_line = line - 1;
if (flags & ObjectFlags::ToBegin)
{
while (begin_line >= 0 and (buffer[begin_line] == "\n" or get_indent(buffer[begin_line], tabstop) >= indent))
--begin_line;
}
++begin_line;
LineCount end_line = line + 1;
if (flags & ObjectFlags::ToEnd)
{
const LineCount end = buffer.line_count();
while (end_line < end and (buffer[end_line] == "\n" 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;
}
return Selection{begin_line, {end_line, buffer[end_line].length() - 1}};
}
Selection select_lines(const Buffer& buffer, const Selection& selection)
{
// no need to be utf8 aware for is_eol as we only use \n as line seperator
BufferIterator first = buffer.iterator_at(selection.anchor());
BufferIterator last = buffer.iterator_at(selection.cursor());
BufferIterator& to_line_start = first <= last ? first : last;
BufferIterator& to_line_end = first <= last ? last : first;
--to_line_start;
skip_while_reverse(to_line_start, buffer.begin(), [](char cur) { return not is_eol(cur); });
if (is_eol(*to_line_start))
{
if (++to_line_start == buffer.end())
--to_line_start;
}
skip_while(to_line_end, buffer.end(), [](char cur) { return not is_eol(cur); });
if (to_line_end == buffer.end())
--to_line_end;
return Selection(first.coord(), last.coord());
}
Selection trim_partial_lines(const Buffer& buffer, const Selection& selection)
{
// same as select_lines
BufferIterator first = buffer.iterator_at(selection.anchor());
BufferIterator last = buffer.iterator_at(selection.cursor());
BufferIterator& to_line_start = first <= last ? first : last;
BufferIterator& to_line_end = first <= last ? last : first;
while (to_line_start != buffer.begin() and *(to_line_start-1) != '\n')
++to_line_start;
while (*(to_line_end+1) != '\n' and to_line_end != to_line_start)
--to_line_end;
return Selection(first.coord(), last.coord());
}
void select_buffer(SelectionList& selections)
{
auto& buffer = selections.buffer();
selections = SelectionList{ buffer, Selection({0,0}, buffer.back_coord()) };
}
void select_all_matches(SelectionList& selections, const Regex& regex)
{
std::vector<Selection> result;
auto& buffer = selections.buffer();
for (auto& sel : selections)
{
auto sel_end = utf8::next(buffer.iterator_at(sel.max()), buffer.end());
RegexIterator re_it(buffer.iterator_at(sel.min()), sel_end, regex);
RegexIterator re_end;
for (; re_it != re_end; ++re_it)
{
auto& begin = (*re_it)[0].first;
auto& end = (*re_it)[0].second;
if (begin == sel_end)
continue;
CaptureList captures;
for (auto& match : *re_it)
captures.emplace_back(match.first, match.second);
result.push_back({ begin.coord(),
(begin == end ? end : utf8::previous(end, begin)).coord(),
std::move(captures) });
}
}
if (result.empty())
throw runtime_error("nothing selected");
selections = std::move(result);
}
void split_selections(SelectionList& selections, const Regex& regex)
{
std::vector<Selection> result;
auto& buffer = selections.buffer();
for (auto& sel : selections)
{
auto begin = buffer.iterator_at(sel.min());
auto sel_end = utf8::next(buffer.iterator_at(sel.max()), buffer.end());
RegexIterator re_it(begin, sel_end, regex,
boost::regex_constants::match_nosubs);
RegexIterator re_end;
for (; re_it != re_end; ++re_it)
{
BufferIterator end = (*re_it)[0].first;
result.push_back({ begin.coord(), (begin == end) ? end.coord() : utf8::previous(end, begin).coord() });
begin = (*re_it)[0].second;
}
if (begin.coord() <= sel.max())
result.push_back({ begin.coord(), sel.max() });
}
selections = std::move(result);
}
}