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Add a regex filter

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regex filter takes three arguments: <line_match> <insert_match> <replacement>
<line_match> is checked from begining of line to point of insertion
<insert_match> is checked on the inserted text (usually only one char)
<replacement> is used to replace the inserted text, it can use $1..9
for captures in line_match, and $c to specify the cursor position.

for example, ':addfilter regex .* \( ($c)' makes inserting an opening
parens insert the closing one as well, keeping the insertion cursor
in the right spot.
This commit is contained in:
Maxime Coste 2012-11-19 14:19:41 +01:00
parent 22c545884f
commit c636a291bd
1 changed files with 53 additions and 0 deletions
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53
src/filters.cc
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@ -59,6 +59,58 @@ void expand_tabulations(Buffer& buffer, Selection& selection, String& content)
}
}
struct RegexFilter
{
RegexFilter(const String& line_match, const String& insert_match,
const String& replacement)
: m_line_match(line_match.c_str()), m_insert_match(insert_match.c_str()),
m_replacement(replacement.c_str()) {}
void operator() (Buffer& buffer, Selection& selection, String& content)
{
const auto& position = selection.last();
auto line_begin = buffer.iterator_at_line_begin(position);
boost::match_results<BufferIterator> results;
if (boost::regex_match(content.c_str(), m_insert_match) and
boost::regex_match(line_begin, position, results, m_line_match))
{
String suffix;
content = results.format(m_replacement.c_str());
auto it = std::find(content.begin(), content.end(), '$');
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 (selection.first() == selection.last())
selection.first() -= suffix.length();
selection.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
{
@ -88,6 +140,7 @@ void register_filters()
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("regex", regex_filter_factory);
registry.register_factory("group", filter_group_factory);
}