462 lines
12 KiB
C++
462 lines
12 KiB
C++
#include "json_ui.hh"
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#include "containers.hh"
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#include "display_buffer.hh"
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#include "exception.hh"
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#include "keys.hh"
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#include "file.hh"
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#include "event_manager.hh"
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#include "value.hh"
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#include "unit_tests.hh"
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#include <utility>
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#include <unistd.h>
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namespace Kakoune
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{
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template<typename T>
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String to_json(ArrayView<const T> array)
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{
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String res;
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for (auto& elem : array)
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{
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if (not res.empty())
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res += ", ";
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res += to_json(elem);
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}
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return "[" + res + "]";
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}
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template<typename T, MemoryDomain D>
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String to_json(const Vector<T, D>& vec) { return to_json(ArrayView<const T>{vec}); }
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String to_json(int i) { return to_string(i); }
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String to_json(bool b) { return b ? "true" : "false"; }
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String to_json(StringView str)
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{
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String res;
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res.reserve(str.length() + 4);
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res += '"';
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for (auto it = str.begin(), end = str.end(); it != end; )
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{
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auto next = std::find_if(it, end, [](char c) {
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return c == '\\' or c == '"' or (c >= 0 and c <= 0x1F);
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});
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res += StringView{it, next};
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if (next == end)
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break;
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char buf[7] = {'\\', *next, 0};
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if (*next >= 0 and *next <= 0x1F)
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sprintf(buf, "\\u%04x", *next);
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res += buf;
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it = next+1;
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}
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res += '"';
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return res;
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}
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String to_json(Color color)
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{
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if (color.color == Kakoune::Color::RGB)
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{
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char buffer[10];
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sprintf(buffer, R"("#%02x%02x%02x")", color.r, color.g, color.b);
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return buffer;
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}
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return to_json(color_to_str(color));
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}
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String to_json(Attribute attributes)
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{
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struct Attr { Attribute attr; StringView name; }
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attrs[] {
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{ Attribute::Exclusive, "exclusive" },
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{ Attribute::Underline, "underline" },
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{ Attribute::Reverse, "reverse" },
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{ Attribute::Blink, "blink" },
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{ Attribute::Bold, "bold" },
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{ Attribute::Dim, "dim" },
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{ Attribute::Italic, "italic" },
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};
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return "[" + join(attrs |
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filter([=](const Attr& a) { return attributes & a.attr; }) |
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transform([](const Attr& a) { return to_json(a.name); }),
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',', false) + "]";
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}
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String to_json(Face face)
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{
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return format(R"(\{ "fg": {}, "bg": {}, "attributes": {} })",
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to_json(face.fg), to_json(face.bg), to_json(face.attributes));
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}
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String to_json(const DisplayAtom& atom)
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{
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return format(R"(\{ "face": {}, "contents": {} })", to_json(atom.face), to_json(atom.content()));
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}
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String to_json(const DisplayLine& line)
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{
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return to_json(line.atoms());
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}
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String to_json(DisplayCoord coord)
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{
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return format(R"(\{ "line": {}, "column": {} })", coord.line, coord.column);
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}
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String to_json(MenuStyle style)
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{
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switch (style)
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{
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case MenuStyle::Prompt: return R"("prompt")";
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case MenuStyle::Inline: return R"("inline")";
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}
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return "";
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}
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String to_json(InfoStyle style)
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{
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switch (style)
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{
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case InfoStyle::Prompt: return R"("prompt")";
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case InfoStyle::Inline: return R"("inline")";
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case InfoStyle::InlineAbove: return R"("inlineAbove")";
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case InfoStyle::InlineBelow: return R"("inlineBelow")";
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case InfoStyle::MenuDoc: return R"("menuDoc")";
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case InfoStyle::Modal: return R"("modal")";
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}
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return "";
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}
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String to_json(CursorMode mode)
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{
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switch (mode)
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{
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case CursorMode::Prompt: return R"("prompt")";
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case CursorMode::Buffer: return R"("buffer")";
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}
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return "";
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}
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String concat()
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{
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return "";
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}
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template<typename First, typename... Args>
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String concat(First&& first, Args&&... args)
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{
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if (sizeof...(Args) != 0)
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return to_json(first) + ", " + concat(args...);
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return to_json(first);
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}
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template<typename... Args>
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void rpc_call(StringView method, Args&&... args)
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{
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auto q = format(R"(\{ "jsonrpc": "2.0", "method": "{}", "params": [{}] }{})",
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method, concat(std::forward<Args>(args)...), "\n");
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write(1, q);
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}
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JsonUI::JsonUI()
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: m_stdin_watcher{0, FdEvents::Read,
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[this](FDWatcher&, FdEvents, EventMode mode) {
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parse_requests(mode);
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}}, m_dimensions{24, 80}
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{
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set_signal_handler(SIGINT, SIG_DFL);
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}
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void JsonUI::draw(const DisplayBuffer& display_buffer,
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const Face& default_face, const Face& padding_face)
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{
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rpc_call("draw", display_buffer.lines(), default_face, padding_face);
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}
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void JsonUI::draw_status(const DisplayLine& status_line,
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const DisplayLine& mode_line,
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const Face& default_face)
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{
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rpc_call("draw_status", status_line, mode_line, default_face);
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}
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void JsonUI::menu_show(ConstArrayView<DisplayLine> items,
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DisplayCoord anchor, Face fg, Face bg,
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MenuStyle style)
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{
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rpc_call("menu_show", items, anchor, fg, bg, style);
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}
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void JsonUI::menu_select(int selected)
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{
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rpc_call("menu_select", selected);
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}
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void JsonUI::menu_hide()
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{
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rpc_call("menu_hide");
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}
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void JsonUI::info_show(StringView title, StringView content,
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DisplayCoord anchor, Face face,
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InfoStyle style)
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{
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rpc_call("info_show", title, content, anchor, face, style);
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}
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void JsonUI::info_hide()
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{
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rpc_call("info_hide");
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}
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void JsonUI::set_cursor(CursorMode mode, DisplayCoord coord)
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{
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rpc_call("set_cursor", mode, coord);
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}
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void JsonUI::refresh(bool force)
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{
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rpc_call("refresh", force);
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}
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void JsonUI::set_ui_options(const Options& options)
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{
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// rpc_call("set_ui_options", options);
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}
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DisplayCoord JsonUI::dimensions()
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{
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return m_dimensions;
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}
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void JsonUI::set_on_key(OnKeyCallback callback)
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{
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m_on_key = std::move(callback);
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}
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using JsonArray = Vector<Value>;
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using JsonObject = HashMap<String, Value>;
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static bool is_digit(char c) { return c >= '0' and c <= '9'; }
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std::tuple<Value, const char*>
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parse_json(const char* pos, const char* end)
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{
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using Result = std::tuple<Value, const char*>;
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if (not skip_while(pos, end, is_blank))
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return {};
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if (is_digit(*pos))
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{
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auto digit_end = pos;
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skip_while(digit_end, end, is_digit);
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return Result{ Value{str_to_int({pos, digit_end})}, digit_end };
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}
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if (end - pos > 4 and StringView{pos, pos+4} == "true")
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return Result{ Value{true}, pos+4 };
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if (end - pos > 5 and StringView{pos, pos+5} == "false")
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return Result{ Value{false}, pos+5 };
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if (*pos == '"')
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{
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String value;
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bool escaped = false;
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++pos;
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for (auto string_end = pos; string_end != end; ++string_end)
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{
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if (escaped)
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{
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escaped = false;
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value += StringView{pos, string_end};
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value.back() = *string_end;
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pos = string_end+1;
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continue;
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}
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if (*string_end == '\\')
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escaped = true;
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if (*string_end == '"')
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{
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value += StringView{pos, string_end};
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return Result{std::move(value), string_end+1};
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}
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}
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return {};
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}
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if (*pos == '[')
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{
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JsonArray array;
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if (*++pos == ']')
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return Result{std::move(array), pos+1};
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while (true)
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{
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Value element;
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std::tie(element, pos) = parse_json(pos, end);
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if (not element)
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return {};
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array.push_back(std::move(element));
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if (not skip_while(pos, end, is_blank))
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return {};
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if (*pos == ',')
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++pos;
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else if (*pos == ']')
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return Result{std::move(array), pos+1};
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else
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throw runtime_error("unable to parse array, expected ',' or ']'");
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}
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}
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if (*pos == '{')
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{
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JsonObject object;
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if (*++pos == '}')
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return Result{std::move(object), pos+1};
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while (true)
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{
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Value name_value;
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std::tie(name_value, pos) = parse_json(pos, end);
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if (not name_value)
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return {};
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String& name = name_value.as<String>();
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if (not skip_while(pos, end, is_blank))
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return {};
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if (*pos++ != ':')
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throw runtime_error("expected :");
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Value element;
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std::tie(element, pos) = parse_json(pos, end);
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if (not element)
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return {};
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object.insert({ std::move(name), std::move(element) });
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if (not skip_while(pos, end, is_blank))
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return {};
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if (*pos == ',')
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++pos;
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else if (*pos == '}')
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return Result{std::move(object), pos+1};
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else
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throw runtime_error("unable to parse object, expected ',' or '}'");
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}
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}
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throw runtime_error("Could not parse json");
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}
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std::tuple<Value, const char*>
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parse_json(StringView json) { return parse_json(json.begin(), json.end()); }
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void JsonUI::eval_json(const Value& json)
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{
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if (not json.is_a<JsonObject>())
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throw runtime_error("json request is not an object");
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const JsonObject& object = json.as<JsonObject>();
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auto json_it = object.find("jsonrpc"_sv);
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if (json_it == object.end() or json_it->value.as<String>() != "2.0")
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throw runtime_error("invalid json rpc request");
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auto method_it = object.find("method"_sv);
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if (method_it == object.end())
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throw runtime_error("invalid json rpc request (method missing)");
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StringView method = method_it->value.as<String>();
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auto params_it = object.find("params"_sv);
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if (params_it == object.end())
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throw runtime_error("invalid json rpc request (params missing)");
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const JsonArray& params = params_it->value.as<JsonArray>();
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if (method == "keys")
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{
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for (auto& key_val : params)
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{
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for (auto& key : parse_keys(key_val.as<String>()))
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m_on_key(key);
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}
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}
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else if (method == "resize")
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{
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if (params.size() != 2)
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throw runtime_error("resize expects 2 parameters");
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DisplayCoord dim{params[0].as<int>(), params[1].as<int>()};
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m_dimensions = dim;
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m_on_key(resize(dim));
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}
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else
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throw runtime_error("unknown method");
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}
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void JsonUI::parse_requests(EventMode mode)
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{
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constexpr size_t bufsize = 1024;
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char buf[bufsize];
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while (fd_readable(0))
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{
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ssize_t size = ::read(0, buf, bufsize);
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if (size == -1 or size == 0)
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break;
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m_requests += StringView{buf, buf + size};
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}
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if (not m_on_key)
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return;
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while (not m_requests.empty())
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{
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const char* pos = nullptr;
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try
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{
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Value json;
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std::tie(json, pos) = parse_json(m_requests);
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if (json)
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eval_json(json);
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}
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catch (runtime_error& error)
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{
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write(2, format("error while handling requests '{}': '{}'",
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m_requests, error.what()));
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// try to salvage request by dropping its first line
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pos = std::min(m_requests.end(), find(m_requests, '\n')+1);
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}
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if (not pos)
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break; // unterminated request ?
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m_requests = String{pos, m_requests.end()};
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}
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}
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UnitTest test_json_parser{[]()
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{
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{
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auto value = std::get<0>(parse_json(R"({ "jsonrpc": "2.0", "method": "keys", "params": [ "b", "l", "a", "h" ] })"));
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kak_assert(value);
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}
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{
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auto value = std::get<0>(parse_json("[10,20]"));
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kak_assert(value and value.is_a<JsonArray>());
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kak_assert(value.as<JsonArray>().at(1).as<int>() == 20);
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}
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{
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auto value = std::get<0>(parse_json("{}"));
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kak_assert(value and value.is_a<JsonObject>());
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kak_assert(value.as<JsonObject>().empty());
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}
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}};
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}
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