kakoune/src/line_modification.cc
2018-10-21 12:10:21 +11:00

328 lines
11 KiB
C++

#include "line_modification.hh"
#include "buffer.hh"
#include "unit_tests.hh"
namespace Kakoune
{
static LineModification make_line_modif(const Buffer::Change& change)
{
LineCount num_added = 0, num_removed = 0;
if (change.type == Buffer::Change::Insert)
num_added = change.end.line - change.begin.line;
else
num_removed = change.end.line - change.begin.line;
// modified a line
if ((change.begin.column != 0 or change.end.column != 0))
{
++num_removed;
++num_added;
}
return { change.begin.line, change.begin.line, num_removed, num_added };
}
Vector<LineModification> compute_line_modifications(const Buffer& buffer, size_t timestamp)
{
Vector<LineModification> res;
for (auto& buf_change : buffer.changes_since(timestamp))
{
auto change = make_line_modif(buf_change);
auto pos = std::upper_bound(res.begin(), res.end(), change.new_line,
[](const LineCount& l, const LineModification& c)
{ return l < c.new_line; });
if (pos != res.begin())
{
auto& prev = *(pos-1);
if (change.new_line <= prev.new_line + prev.num_added)
{
--pos;
const LineCount removed_from_previously_added_by_pos =
clamp(pos->new_line + pos->num_added - change.new_line,
0_line, std::min(pos->num_added, change.num_removed));
pos->num_removed += change.num_removed - removed_from_previously_added_by_pos;
pos->num_added += change.num_added - removed_from_previously_added_by_pos;
}
else
{
change.old_line -= prev.diff();
pos = res.insert(pos, change);
}
}
else
pos = res.insert(pos, change);
auto next = pos + 1;
auto diff = buf_change.end.line - buf_change.begin.line;
if (buf_change.type == Buffer::Change::Erase)
{
auto delend = std::upper_bound(next, res.end(), change.new_line + change.num_removed,
[](const LineCount& l, const LineModification& c)
{ return l < c.new_line; });
for (auto it = next; it != delend; ++it)
{
const LineCount removed_from_previously_added_by_it =
std::min(it->num_added, change.new_line + change.num_removed - it->new_line);
pos->num_removed += it->num_removed - removed_from_previously_added_by_it;
pos->num_added += it->num_added - removed_from_previously_added_by_it;
}
next = res.erase(next, delend);
if (diff != 0)
{
for (auto it = next; it != res.end(); ++it)
it->new_line -= diff;
}
}
else if (diff != 0)
{
for (auto it = next; it != res.end(); ++it)
it->new_line += diff;
}
}
return res;
}
bool operator==(const LineModification& lhs, const LineModification& rhs)
{
return std::tie(lhs.old_line, lhs.new_line, lhs.num_removed, lhs.num_added) ==
std::tie(rhs.old_line, rhs.new_line, rhs.num_removed, rhs.num_added);
}
void LineRangeSet::update(ConstArrayView<LineModification> modifs)
{
if (modifs.empty())
return;
for (auto it = begin(); it != end(); ++it)
{
auto modif_beg = std::lower_bound(modifs.begin(), modifs.end(), it->begin,
[](const LineModification& c, const LineCount& l)
{ return c.old_line + c.num_removed < l; });
auto modif_end = std::upper_bound(modifs.begin(), modifs.end(), it->end,
[](const LineCount& l, const LineModification& c)
{ return l < c.old_line; });
if (modif_beg == modifs.end())
{
const auto diff = (modif_beg-1)->diff();
it->begin += diff;
it->end += diff;
continue;
}
const auto diff = modif_beg->new_line - modif_beg->old_line;
it->begin += diff;
it->end += diff;
while (modif_beg != modif_end)
{
auto& m = *modif_beg++;
if (m.num_removed > 0)
{
if (m.new_line < it->begin)
it->begin = std::max(m.new_line, it->begin - m.num_removed);
it->end = std::max(m.new_line, std::max(it->begin, it->end - m.num_removed));
}
if (m.num_added > 0)
{
if (it->begin >= m.new_line)
it->begin += m.num_added;
else
{
it = insert(it, {it->begin, m.new_line}) + 1;
it->begin = m.new_line + m.num_added;
}
it->end += m.num_added;
}
}
};
erase(std::remove_if(begin(), end(), [](auto& r) { return r.begin >= r.end; }), end());
}
void LineRangeSet::add_range(LineRange range, std::function<void (LineRange)> on_new_range)
{
auto it = std::lower_bound(begin(), end(), range.begin,
[](LineRange range, LineCount line) { return range.end < line; });
if (it == end() or it->begin > range.end)
on_new_range(range);
else
{
auto pos = range.begin;
while (it != end() and it->begin <= range.end)
{
if (pos < it->begin)
on_new_range({pos, it->begin});
range = LineRange{std::min(range.begin, it->begin), std::max(range.end, it->end)};
pos = it->end;
it = erase(it);
}
if (pos < range.end)
on_new_range({pos, range.end});
}
insert(it, range);
}
void LineRangeSet::remove_range(LineRange range)
{
auto inside = [](LineCount line, LineRange range) {
return range.begin <= line and line < range.end;
};
auto it = std::lower_bound(begin(), end(), range.begin,
[](LineRange range, LineCount line) { return range.end < line; });
if (it == end() or it->begin > range.end)
return;
else while (it != end() and it->begin <= range.end)
{
if (it->begin < range.begin and range.end <= it->end)
{
it = insert(it, {it->begin, range.begin}) + 1;
it->begin = range.end;
}
if (inside(it->begin, range))
it->begin = range.end;
if (inside(it->end, range))
it->end = range.begin;
if (it->end <= it->begin)
it = erase(it);
else
++it;
}
}
UnitTest test_line_modifications{[]()
{
{
Buffer buffer("test", Buffer::Flags::None, "line 1\nline 2\n");
auto ts = buffer.timestamp();
buffer.erase({1, 0}, {2, 0});
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 1, 1, 1, 0 });
}
{
Buffer buffer("test", Buffer::Flags::None, "line 1\nline 2\n");
auto ts = buffer.timestamp();
buffer.insert({2, 0}, "line 3");
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 2, 2, 0, 1 });
}
{
Buffer buffer("test", Buffer::Flags::None, "line 1\nline 2\nline 3\n");
auto ts = buffer.timestamp();
buffer.insert({1, 4}, "hoho\nhehe");
buffer.erase({0, 0}, {1, 0});
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 0, 0, 2, 2 });
}
{
Buffer buffer("test", Buffer::Flags::None, "line 1\nline 2\nline 3\nline 4\n");
auto ts = buffer.timestamp();
buffer.erase({0,0}, {3,0});
buffer.insert({1,0}, "newline 1\nnewline 2\nnewline 3\n");
buffer.erase({0,0}, {1,0});
{
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 0, 0, 4, 3 });
}
buffer.insert({3,0}, "newline 4\n");
{
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 0, 0, 4, 4 });
}
}
{
Buffer buffer("test", Buffer::Flags::None, "line 1\n");
auto ts = buffer.timestamp();
buffer.insert({0,0}, "n");
buffer.insert({0,1}, "e");
buffer.insert({0,2}, "w");
auto modifs = compute_line_modifications(buffer, ts);
kak_assert(modifs.size() == 1 and modifs[0] == LineModification{ 0, 0, 1, 1 });
}
}};
UnitTest test_line_range_set{[]{
auto expect = [](ConstArrayView<LineRange> ranges) {
return [it = ranges.begin(), end = ranges.end()](LineRange r) mutable {
kak_assert(it != end);
kak_assert(r == *it++);
};
};
{
LineRangeSet ranges;
ranges.add_range({0, 5}, expect({{0, 5}}));
ranges.add_range({10, 15}, expect({{10, 15}}));
ranges.add_range({5, 10}, expect({{5, 10}}));
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
ranges.add_range({5, 10}, expect({}));
ranges.remove_range({3, 8});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 15}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 7}, expect({{0, 7}}));
ranges.add_range({9, 15}, expect({{9, 15}}));
ranges.add_range({5, 10}, expect({{7, 9}}));
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 7}, expect({{0, 7}}));
ranges.add_range({11, 15}, expect({{11, 15}}));
ranges.add_range({5, 10}, expect({{7, 10}}));
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 10}, {11, 15}}));
ranges.remove_range({8, 13});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 8}, {13, 15}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 5}, expect({{0, 5}}));
ranges.add_range({10, 15}, expect({{10, 15}}));
ranges.update(ConstArrayView<LineModification>{{3, 3, 3, 1}, {11, 9, 2, 4}});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 9}, {13, 15}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 5}, expect({{0, 5}}));
ranges.update(ConstArrayView<LineModification>{{2, 2, 2, 0}});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 5}, expect({{0, 5}}));
ranges.update(ConstArrayView<LineModification>{{2, 2, 0, 2}});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 2}, {4, 7}}));
}
{
LineRangeSet ranges;
ranges.add_range({0, 1}, expect({{0, 1}}));
ranges.add_range({5, 10}, expect({{5, 10}}));
ranges.add_range({15, 20}, expect({{15, 20}}));
ranges.add_range({25, 30}, expect({{25, 30}}));
ranges.update(ConstArrayView<LineModification>{{2, 2, 3, 0}});
kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 1}, {2, 7}, {12, 17}, {22, 27}}));
}
}};
}