kakoune/src/filters.cc

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#include "filters.hh"
#include "filter_registry.hh"
#include "buffer.hh"
#include "filter_group.hh"
namespace Kakoune
{
void preserve_indent(Buffer& buffer, Modification& modification)
{
if (modification.type == Modification::Insert and
modification.content == "\n")
{
BufferIterator line_begin = buffer.iterator_at_line_begin(modification.position - 1);
BufferIterator first_non_white = line_begin;
while ((*first_non_white == '\t' or *first_non_white == ' ') and
not first_non_white.is_end())
++first_non_white;
modification.content += buffer.string(line_begin, first_non_white);
}
}
void cleanup_whitespaces(Buffer& buffer, Modification& modification)
{
if (modification.type == Modification::Insert and
modification.content[0] == '\n' and not modification.position.is_begin())
{
BufferIterator position = modification.position-1;
while (*position == ' ' or *position == '\t' and not position.is_begin())
--position;
++position;
if (position != modification.position)
{
buffer.modify(Modification::make_erase(position, modification.position));
modification.position = position;
}
}
}
void expand_tabulations(Buffer& buffer, Modification& modification)
{
const int tabstop = buffer.option_manager()["tabstop"];
if (modification.type == Modification::Insert and
modification.content == "\t")
{
int column = 0;
BufferCoord pos = buffer.line_and_column_at(modification.position);
for (auto line_it = buffer.iterator_at({pos.line, 0});
line_it != modification.position; ++line_it)
{
assert(*line_it != '\n');
if (*line_it == '\t')
column += tabstop - (column % tabstop);
else
++column;
}
int count = tabstop - (column % tabstop);
modification.content.clear();
for (int i = 0; i < count; ++i)
modification.content += ' ';
}
}
template<void (*filter_func)(Buffer&, Modification&)>
class SimpleFilterFactory
{
public:
SimpleFilterFactory(const String& id) : m_id(id) {}
FilterAndId operator()(const FilterParameters& params) const
{
return FilterAndId(m_id, FilterFunc(filter_func));
}
private:
String m_id;
};
FilterAndId filter_group_factory(const FilterParameters& params)
{
if (params.size() != 1)
throw runtime_error("wrong parameter count");
return FilterAndId(params[0], FilterGroup());
}
void register_filters()
{
FilterRegistry& registry = FilterRegistry::instance();
registry.register_factory("preserve_indent", SimpleFilterFactory<preserve_indent>("preserve_indent"));
registry.register_factory("cleanup_whitespaces", SimpleFilterFactory<cleanup_whitespaces>("cleanup_whitespaces"));
registry.register_factory("expand_tabulations", SimpleFilterFactory<expand_tabulations>("expand_tabulations"));
registry.register_factory("group", filter_group_factory);
}
}