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Refactor whitespace highlighter into a struct

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This commit is contained in:
Maxime Coste 2018-08-27 08:05:00 +10:00
parent a32d7069c6
commit b06ba627b2
1 changed files with 70 additions and 66 deletions
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78
src/highlighters.cc
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@ -954,10 +954,40 @@ struct TabulationHighlighter : Highlighter
}
};
void show_whitespaces(HighlightContext context, DisplayBuffer& display_buffer, BufferRange,
StringView tab, StringView tabpad,
StringView spc, StringView lf, StringView nbsp)
struct ShowWhitespacesHighlighter : Highlighter
{
ShowWhitespacesHighlighter(String tab, String tabpad, String spc, String lf, String nbsp)
: Highlighter{HighlightPass::Move}, m_tab{std::move(tab)}, m_tabpad{std::move(tabpad)},
m_spc{std::move(spc)}, m_lf{std::move(lf)}, m_nbsp{std::move(nbsp)}
{}
static std::unique_ptr<Highlighter> create(HighlighterParameters params, Highlighter*)
{
static const ParameterDesc param_desc{
{ { "tab", { true, "" } },
{ "tabpad", { true, "" } },
{ "spc", { true, "" } },
{ "lf", { true, "" } },
{ "nbsp", { true, "" } } },
ParameterDesc::Flags::None, 0, 0
};
ParametersParser parser(params, param_desc);
auto get_param = [&](StringView param, StringView fallback) {
StringView value = parser.get_switch(param).value_or(fallback);
if (value.char_length() != 1)
throw runtime_error{format("-{} expects a single character parameter", param)};
return value.str();
};
return std::make_unique<ShowWhitespacesHighlighter>(
get_param("tab", "→"), get_param("tabpad", " "), get_param("spc", "·"),
get_param("lf", "¬"), get_param("nbsp", "⍽"));
}
private:
void do_highlight(HighlightContext context, DisplayBuffer& display_buffer, BufferRange)
{
const int tabstop = context.context.options()["tabstop"].get<int>();
auto whitespaceface = context.context.faces()["Whitespace"];
auto& buffer = context.context.buffer();
@ -987,50 +1017,24 @@ void show_whitespaces(HighlightContext context, DisplayBuffer& display_buffer, B
const ColumnCount column = get_column(buffer, tabstop, coord);
const ColumnCount count = tabstop - (column % tabstop) -
std::max(win_column - column, 0_col);
atom_it->replace(tab + String(tabpad[(CharCount)0], count - tab.column_length()));
atom_it->replace(m_tab + String(m_tabpad[(CharCount)0], count - m_tab.column_length()));
}
else if (cp == ' ')
atom_it->replace(spc.str());
atom_it->replace(m_spc);
else if (cp == '\n')
atom_it->replace(lf.str());
atom_it->replace(m_lf);
else if (cp == 0xA0)
atom_it->replace(nbsp.str());
atom_it->replace(m_nbsp);
atom_it->face = merge_faces(atom_it->face, whitespaceface);
break;
}
}
}
}
}
}
std::unique_ptr<Highlighter> show_whitespaces_factory(HighlighterParameters params, Highlighter*)
{
static const ParameterDesc param_desc{
{ { "tab", { true, "" } },
{ "tabpad", { true, "" } },
{ "spc", { true, "" } },
{ "lf", { true, "" } },
{ "nbsp", { true, "" } } },
ParameterDesc::Flags::None, 0, 0
};
ParametersParser parser(params, param_desc);
auto get_param = [&](StringView param, StringView fallback) {
StringView value = parser.get_switch(param).value_or(fallback);
if (value.char_length() != 1)
throw runtime_error{format("-{} expects a single character parameter", param)};
return value.str();
};
using namespace std::placeholders;
auto func = std::bind(show_whitespaces, _1, _2, _3,
get_param("tab", "→"), get_param("tabpad", " "),
get_param("spc", "·"),
get_param("lf", "¬"),
get_param("nbsp", "⍽"));
return make_highlighter(std::move(func), HighlightPass::Move);
}
const String m_tab, m_tabpad, m_spc, m_lf, m_nbsp;
};
struct LineNumbersHighlighter : Highlighter
{
@ -2143,7 +2147,7 @@ void register_highlighters()
"Apply the MatchingChar face to the char matching the one under the cursor" } });
registry.insert({
"show-whitespaces",
{ show_whitespaces_factory,
{ ShowWhitespacesHighlighter::create,
"Display whitespaces using symbols \n"
"Parameters: -tab <separator> -tabpad <separator> -lf <separator> -spc <separator> -nbsp <separator>\n" } });
registry.insert({