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-- mod-version:3 --lite-xl 2.1
local core = require "core"
local style = require "core.style"
local command = require "core.command"
local keymap = require "core.keymap"
local DocView = require "core.docview"
local bracket_maps = {
-- [ ] ( ) { }
{ [91] = 93, [40] = 41, [123] = 125, step = 1 },
-- ] [ ) ( } {
{ [93] = 91, [41] = 40, [125] = 123, step = -1 },
}
local function get_matching_bracket(doc, line, col, line_limit, open_byte, close_byte, step)
local end_line = line + line_limit * step
local depth = 0
while line ~= end_line do
local byte = doc.lines[line]:byte(col)
if byte == open_byte then
depth = depth + 1
elseif byte == close_byte then
depth = depth - 1
if depth == 0 then return line, col end
end
local prev_line, prev_col = line, col
line, col = doc:position_offset(line, col, step)
if line == prev_line and col == prev_col then
break
end
end
end
local state = {}
local select_adj = 0
local function update_state(line_limit)
line_limit = line_limit or math.huge
-- reset if we don't have a document (eg. DocView isn't focused)
local doc = core.active_view.doc
if not doc then
state = {}
return
end
-- early exit if nothing has changed since the last call
local line, col = doc:get_selection()
local change_id = doc:get_change_id()
if state.doc == doc and state.line == line and state.col == col
and state.change_id == change_id and state.limit == line_limit then
return
end
-- find matching bracket if we're on a bracket
local line2, col2
for _, map in ipairs(bracket_maps) do
for i = 0, -1, -1 do
local line, col = doc:position_offset(line, col, i)
local open = doc.lines[line]:byte(col)
local close = map[open]
if close then
-- i == 0 if the cursor is on the left side of a bracket (or -1 when on right)
select_adj = i + 1 -- if i == 0 then select_adj = 1 else select_adj = 0 end
line2, col2 = get_matching_bracket(doc, line, col, line_limit, open, close, map.step)
goto found
end
end
end
::found::
-- update
state = {
change_id = change_id,
doc = doc,
line = line,
col = col,
line2 = line2,
col2 = col2,
limit = line_limit,
}
end
local update = DocView.update
function DocView:update(...)
update(self, ...)
update_state(100)
end
local draw_line_text = DocView.draw_line_text
function DocView:draw_line_text(line, x, y)
local lh = draw_line_text(self, line, x, y)
if self.doc == state.doc and line == state.line2 then
local color = style.bracketmatch_color or style.syntax["function"]
local x1 = x + self:get_col_x_offset(line, state.col2)
local x2 = x + self:get_col_x_offset(line, state.col2 + 1)
local h = math.ceil(1 * SCALE)
renderer.draw_rect(x1, y + self:get_line_height() - h, x2 - x1, h, color)
end
return lh
end
command.add("core.docview", {
["bracket-match:move-to-matching"] = function()
update_state()
if state.line2 then
core.active_view.doc:set_selection(state.line2, state.col2)
end
end,
["bracket-match:select-to-matching"] = function()
update_state()
if state.line2 then
core.active_view.doc:set_selection(state.line, state.col, state.line2, state.col2 + select_adj)
end
end,
})
keymap.add {
["ctrl+m"] = "bracket-match:move-to-matching",
["ctrl+shift+m"] = "bracket-match:select-to-matching",
}
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