1
1
mirror of https://github.com/mawww/kakoune.git synced 2024-12-24 03:56:32 +03:00
kakoune/src/filters.cc
2013-06-04 14:21:07 +02:00

145 lines
4.5 KiB
C++

#include "filters.hh"
#include "buffer.hh"
#include "selection.hh"
namespace Kakoune
{
void preserve_indent(Buffer& buffer, Selection& selection, String& content)
{
if (content == "\n")
{
BufferCoord line_begin{selection.last().line, 0};
auto first_non_white = buffer.iterator_at(line_begin);
while ((*first_non_white == '\t' or *first_non_white == ' ') and
not first_non_white.is_end())
++first_non_white;
content += buffer.string(line_begin, first_non_white);
}
}
void cleanup_whitespaces(Buffer& buffer, Selection& selection, String& content)
{
const auto position = buffer.iterator_at(selection.last());
if (content[0] == '\n' and not position.is_begin())
{
auto whitespace_start = position-1;
while ((*whitespace_start == ' ' or *whitespace_start == '\t') and
not whitespace_start .is_begin())
--whitespace_start;
++whitespace_start;
if (whitespace_start != position)
buffer.erase(whitespace_start, position);
}
}
void expand_tabulations(Buffer& buffer, Selection& selection, String& content)
{
const int tabstop = buffer.options()["tabstop"].get<int>();
if (content == "\t")
{
int column = 0;
const auto position = buffer.iterator_at(selection.last());
for (auto it = buffer.iterator_at_line_begin(position);
it != position; ++it)
{
kak_assert(*it != '\n');
if (*it == '\t')
column += tabstop - (column % tabstop);
else
++column;
}
CharCount count = tabstop - (column % tabstop);
content = String(' ', count);
}
}
struct RegexFilter
{
RegexFilter(const String& line_match, const String& insert_match,
const String& replacement)
: m_line_match(line_match.c_str()), m_insert_match(insert_match.c_str()),
m_replacement(replacement.c_str()) {}
void operator() (Buffer& buffer, Selection& selection, String& content)
{
const auto position = buffer.iterator_at(selection.last());
auto line_begin = buffer.iterator_at_line_begin(position);
boost::match_results<BufferIterator> results;
if (boost::regex_match(content.c_str(), m_insert_match) and
boost::regex_match(line_begin, position, results, m_line_match))
{
content = results.format(m_replacement.c_str());
auto it = std::find(content.begin(), content.end(), '$');
if (it != content.end())
{
++it;
if (it != content.end() && *it == 'c')
{
String suffix(it+1, content.end());
content = String(content.begin(), it-1);
auto& first = selection.first();
auto& last = selection.last();
buffer.insert(position, suffix);
if (first == last)
first = buffer.advance(first, -suffix.length());
last = buffer.advance(last, -suffix.length());
}
}
}
}
private:
Regex m_line_match;
Regex m_insert_match;
String m_replacement;
};
FilterAndId regex_filter_factory(const FilterParameters& params)
{
if (params.size() != 3)
throw runtime_error("wrong parameter count");
return FilterAndId{"re" + params[0] + "__" + params[1],
RegexFilter{params[0], params[1], params[2]}};
}
template<void (*filter_func)(Buffer&, Selection&, String&)>
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_func("preserve_indent", SimpleFilterFactory<preserve_indent>("preserve_indent"));
registry.register_func("cleanup_whitespaces", SimpleFilterFactory<cleanup_whitespaces>("cleanup_whitespaces"));
registry.register_func("expand_tabulations", SimpleFilterFactory<expand_tabulations>("expand_tabulations"));
registry.register_func("regex", regex_filter_factory);
registry.register_func("group", filter_group_factory);
}
}