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