lite-xl/data/core/doc/init.lua

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local Object = require "core.object"
local Highlighter = require "core.doc.highlighter"
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local core = require "core"
local syntax = require "core.syntax"
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local config = require "core.config"
local common = require "core.common"
local Doc = Object:extend()
local function split_lines(text)
local res = {}
for line in (text .. "\n"):gmatch("(.-)\n") do
table.insert(res, line)
end
return res
end
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function Doc:new(filename, abs_filename, new_file)
self.new_file = new_file
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self:reset()
if filename then
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self:set_filename(filename, abs_filename)
if not new_file then
self:load(filename)
end
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end
end
function Doc:reset()
self.lines = { "\n" }
self.selections = { 1, 1, 1, 1 }
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self.undo_stack = { idx = 1 }
self.redo_stack = { idx = 1 }
self.clean_change_id = 1
self.highlighter = Highlighter(self)
self:reset_syntax()
end
function Doc:reset_syntax()
local header = self:get_text(1, 1, self:position_offset(1, 1, 128))
local syn = syntax.get(self.filename or "", header)
if self.syntax ~= syn then
self.syntax = syn
self.highlighter:soft_reset()
end
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end
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function Doc:set_filename(filename, abs_filename)
self.filename = filename
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self.abs_filename = abs_filename
self:reset_syntax()
end
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function Doc:load(filename)
local fp = assert( io.open(filename, "rb") )
self:reset()
self.lines = {}
local i = 1
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for line in fp:lines() do
if line:byte(-1) == 13 then
line = line:sub(1, -2)
self.crlf = true
end
table.insert(self.lines, line .. "\n")
self.highlighter.lines[i] = false
i = i + 1
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end
if #self.lines == 0 then
table.insert(self.lines, "\n")
end
fp:close()
self:reset_syntax()
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end
function Doc:reload()
if self.filename then
local sel = { self:get_selection() }
self:load(self.filename)
self:clean()
self:set_selection(table.unpack(sel))
end
end
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function Doc:save(filename, abs_filename)
if not filename then
assert(self.filename, "no filename set to default to")
filename = self.filename
abs_filename = self.abs_filename
else
assert(self.filename or abs_filename, "calling save on unnamed doc without absolute path")
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end
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local fp = assert( io.open(filename, "wb") )
for _, line in ipairs(self.lines) do
if self.crlf then line = line:gsub("\n", "\r\n") end
fp:write(line)
end
fp:close()
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self:set_filename(filename, abs_filename)
self.new_file = false
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self:clean()
end
function Doc:get_name()
return self.filename or "unsaved"
end
function Doc:is_dirty()
if self.new_file then
return #self.lines > 1 or #self.lines[1] > 1
else
return self.clean_change_id ~= self:get_change_id()
end
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end
function Doc:clean()
self.clean_change_id = self:get_change_id()
end
function Doc:get_indent_info()
if not self.indent_info then return config.tab_type, config.indent_size, false end
return self.indent_info.type or config.tab_type,
self.indent_info.size or config.indent_size,
self.indent_info.confirmed
end
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function Doc:get_change_id()
return self.undo_stack.idx
end
-- Cursor section. Cursor indices are *only* valid during a get_selections() call.
-- Cursors will always be iterated in order from top to bottom. Through normal operation
-- curors can never swap positions; only merge or split, or change their position in cursor
-- order.
function Doc:get_selection(sort)
local idx, line1, col1, line2, col2 = self:get_selections(sort)({ self.selections, sort }, 0)
return line1, col1, line2, col2, sort
end
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function Doc:get_selection_text(limit)
limit = limit or math.huge
local result = {}
for idx, line1, col1, line2, col2 in self:get_selections() do
if idx > limit then break end
if line1 ~= line2 or col1 ~= col2 then
local text = self:get_text(line1, col1, line2, col2)
if text ~= "" then result[#result + 1] = text end
end
end
return table.concat(result, "\n")
end
function Doc:has_selection()
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local line1, col1, line2, col2 = self:get_selection(false)
return line1 ~= line2 or col1 ~= col2
end
function Doc:has_any_selection()
for idx, line1, col1, line2, col2 in self:get_selections() do
if line1 ~= line2 or col1 ~= col2 then return true end
end
return false
end
function Doc:sanitize_selection()
for idx, line1, col1, line2, col2 in self:get_selections() do
self:set_selections(idx, line1, col1, line2, col2)
end
end
local function sort_positions(line1, col1, line2, col2)
if line1 > line2 or line1 == line2 and col1 > col2 then
return line2, col2, line1, col1
end
return line1, col1, line2, col2
end
function Doc:set_selections(idx, line1, col1, line2, col2, swap, rm)
assert(not line2 == not col2, "expected 3 or 5 arguments")
if swap then line1, col1, line2, col2 = line2, col2, line1, col1 end
line1, col1 = self:sanitize_position(line1, col1)
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line2, col2 = self:sanitize_position(line2 or line1, col2 or col1)
common.splice(self.selections, (idx - 1)*4 + 1, rm == nil and 4 or rm, { line1, col1, line2, col2 })
end
function Doc:add_selection(line1, col1, line2, col2, swap)
local l1, c1 = sort_positions(line1, col1, line2 or line1, col2 or col1)
local target = #self.selections / 4 + 1
for idx, tl1, tc1 in self:get_selections(true) do
if l1 < tl1 or l1 == tl1 and c1 < tc1 then
target = idx
break
end
end
self:set_selections(target, line1, col1, line2, col2, swap, 0)
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end
function Doc:remove_selection(idx)
common.splice(self.selections, (idx - 1) * 4 + 1, 4)
end
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function Doc:set_selection(line1, col1, line2, col2, swap)
self.selections = {}
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self:set_selections(1, line1, col1, line2, col2, swap)
end
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function Doc:merge_cursors(idx)
for i = (idx or (#self.selections - 3)), (idx or 5), -4 do
for j = 1, i - 4, 4 do
if self.selections[i] == self.selections[j] and
self.selections[i+1] == self.selections[j+1] then
common.splice(self.selections, i, 4)
break
end
end
end
end
local function selection_iterator(invariant, idx)
local target = invariant[3] and (idx*4 - 7) or (idx*4 + 1)
if target > #invariant[1] or target <= 0 or (type(invariant[3]) == "number" and invariant[3] ~= idx - 1) then return end
if invariant[2] then
return idx+(invariant[3] and -1 or 1), sort_positions(table.unpack(invariant[1], target, target+4))
else
return idx+(invariant[3] and -1 or 1), table.unpack(invariant[1], target, target+4)
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end
end
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-- If idx_reverse is true, it'll reverse iterate. If nil, or false, regular iterate.
-- If a number, runs for exactly that iteration.
function Doc:get_selections(sort_intra, idx_reverse)
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return selection_iterator, { self.selections, sort_intra, idx_reverse },
idx_reverse == true and ((#self.selections / 4) + 1) or ((idx_reverse or -1)+1)
end
-- End of cursor seciton.
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function Doc:sanitize_position(line, col)
line = common.clamp(line, 1, #self.lines)
col = common.clamp(col, 1, #self.lines[line])
return line, col
end
local function position_offset_func(self, line, col, fn, ...)
line, col = self:sanitize_position(line, col)
return fn(self, line, col, ...)
end
local function position_offset_byte(self, line, col, offset)
line, col = self:sanitize_position(line, col)
col = col + offset
while line > 1 and col < 1 do
line = line - 1
col = col + #self.lines[line]
end
while line < #self.lines and col > #self.lines[line] do
col = col - #self.lines[line]
line = line + 1
end
return self:sanitize_position(line, col)
end
local function position_offset_linecol(self, line, col, lineoffset, coloffset)
return self:sanitize_position(line + lineoffset, col + coloffset)
end
function Doc:position_offset(line, col, ...)
if type(...) ~= "number" then
return position_offset_func(self, line, col, ...)
elseif select("#", ...) == 1 then
return position_offset_byte(self, line, col, ...)
elseif select("#", ...) == 2 then
return position_offset_linecol(self, line, col, ...)
else
error("bad number of arguments")
end
end
function Doc:get_text(line1, col1, line2, col2)
line1, col1 = self:sanitize_position(line1, col1)
line2, col2 = self:sanitize_position(line2, col2)
line1, col1, line2, col2 = sort_positions(line1, col1, line2, col2)
if line1 == line2 then
return self.lines[line1]:sub(col1, col2 - 1)
end
local lines = { self.lines[line1]:sub(col1) }
for i = line1 + 1, line2 - 1 do
table.insert(lines, self.lines[i])
end
table.insert(lines, self.lines[line2]:sub(1, col2 - 1))
return table.concat(lines)
end
function Doc:get_char(line, col)
line, col = self:sanitize_position(line, col)
return self.lines[line]:sub(col, col)
end
local function push_undo(undo_stack, time, type, ...)
undo_stack[undo_stack.idx] = { type = type, time = time, ... }
undo_stack[undo_stack.idx - config.max_undos] = nil
undo_stack.idx = undo_stack.idx + 1
end
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local function pop_undo(self, undo_stack, redo_stack, modified)
-- pop command
local cmd = undo_stack[undo_stack.idx - 1]
if not cmd then return end
undo_stack.idx = undo_stack.idx - 1
-- handle command
if cmd.type == "insert" then
local line, col, text = table.unpack(cmd)
self:raw_insert(line, col, text, redo_stack, cmd.time)
elseif cmd.type == "remove" then
local line1, col1, line2, col2 = table.unpack(cmd)
self:raw_remove(line1, col1, line2, col2, redo_stack, cmd.time)
elseif cmd.type == "selection" then
self.selections = { table.unpack(cmd) }
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self:sanitize_selection()
end
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modified = modified or (cmd.type ~= "selection")
-- if next undo command is within the merge timeout then treat as a single
-- command and continue to execute it
local next = undo_stack[undo_stack.idx - 1]
if next and math.abs(cmd.time - next.time) < config.undo_merge_timeout then
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return pop_undo(self, undo_stack, redo_stack, modified)
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end
if modified then
self:on_text_change("undo")
end
end
function Doc:raw_insert(line, col, text, undo_stack, time)
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-- split text into lines and merge with line at insertion point
local lines = split_lines(text)
local len = #lines[#lines]
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local before = self.lines[line]:sub(1, col - 1)
local after = self.lines[line]:sub(col)
for i = 1, #lines - 1 do
lines[i] = lines[i] .. "\n"
end
lines[1] = before .. lines[1]
lines[#lines] = lines[#lines] .. after
-- splice lines into line array
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common.splice(self.lines, line, 1, lines)
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-- keep cursors where they should be
for idx, cline1, ccol1, cline2, ccol2 in self:get_selections(true, true) do
if cline1 < line then break end
local line_addition = (line < cline1 or col < ccol1) and #lines - 1 or 0
local column_addition = line == cline1 and ccol1 > col and len or 0
self:set_selections(idx, cline1 + line_addition, ccol1 + column_addition, cline2 + line_addition, ccol2 + column_addition)
end
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-- push undo
local line2, col2 = self:position_offset(line, col, #text)
push_undo(undo_stack, time, "selection", table.unpack(self.selections))
push_undo(undo_stack, time, "remove", line, col, line2, col2)
-- update highlighter and assure selection is in bounds
self.highlighter:insert_notify(line, #lines - 1)
self:sanitize_selection()
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end
function Doc:raw_remove(line1, col1, line2, col2, undo_stack, time)
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-- push undo
local text = self:get_text(line1, col1, line2, col2)
push_undo(undo_stack, time, "selection", table.unpack(self.selections))
push_undo(undo_stack, time, "insert", line1, col1, text)
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-- get line content before/after removed text
local before = self.lines[line1]:sub(1, col1 - 1)
local after = self.lines[line2]:sub(col2)
-- splice line into line array
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common.splice(self.lines, line1, line2 - line1 + 1, { before .. after })
-- move all cursors back if they share a line with the removed text
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for idx, cline1, ccol1, cline2, ccol2 in self:get_selections(true, true) do
if cline1 < line2 then break end
local line_removal = line2 - line1
local column_removal = line2 == cline2 and col2 < ccol1 and (line2 == line1 and col2 - col1 or col2) or 0
self:set_selections(idx, cline1 - line_removal, ccol1 - column_removal, cline2 - line_removal, ccol2 - column_removal)
end
-- update highlighter and assure selection is in bounds
self.highlighter:remove_notify(line1, line2 - line1)
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self:sanitize_selection()
end
function Doc:insert(line, col, text)
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self.redo_stack = { idx = 1 }
line, col = self:sanitize_position(line, col)
self:raw_insert(line, col, text, self.undo_stack, system.get_time())
self:on_text_change("insert")
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end
function Doc:remove(line1, col1, line2, col2)
self.redo_stack = { idx = 1 }
line1, col1 = self:sanitize_position(line1, col1)
line2, col2 = self:sanitize_position(line2, col2)
line1, col1, line2, col2 = sort_positions(line1, col1, line2, col2)
self:raw_remove(line1, col1, line2, col2, self.undo_stack, system.get_time())
self:on_text_change("remove")
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end
function Doc:undo()
pop_undo(self, self.undo_stack, self.redo_stack, false)
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end
function Doc:redo()
pop_undo(self, self.redo_stack, self.undo_stack, false)
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end
function Doc:text_input(text, idx)
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for sidx, line1, col1, line2, col2 in self:get_selections(true, idx or true) do
if line1 ~= line2 or col1 ~= col2 then
self:delete_to_cursor(sidx)
end
self:insert(line1, col1, text)
self:move_to_cursor(sidx, #text)
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end
end
function Doc:replace_cursor(idx, line1, col1, line2, col2, fn)
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local old_text = self:get_text(line1, col1, line2, col2)
local new_text, res = fn(old_text)
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if old_text ~= new_text then
self:insert(line2, col2, new_text)
self:remove(line1, col1, line2, col2)
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if line1 == line2 and col1 == col2 then
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line2, col2 = self:position_offset(line1, col1, #new_text)
self:set_selections(idx, line1, col1, line2, col2)
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end
end
return res
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end
function Doc:replace(fn)
local has_selection, results = false, { }
for idx, line1, col1, line2, col2 in self:get_selections(true) do
if line1 ~= line2 or col1 ~= col2 then
results[idx] = self:replace_cursor(idx, line1, col1, line2, col2, fn)
has_selection = true
end
end
if not has_selection then
self:set_selection(table.unpack(self.selections))
results[1] = self:replace_cursor(1, 1, 1, #self.lines, #self.lines[#self.lines], fn)
end
return results
end
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function Doc:delete_to_cursor(idx, ...)
for sidx, line1, col1, line2, col2 in self:get_selections(true, idx) do
if line1 ~= line2 or col1 ~= col2 then
self:remove(line1, col1, line2, col2)
else
local l2, c2 = self:position_offset(line1, col1, ...)
self:remove(line1, col1, l2, c2)
line1, col1 = sort_positions(line1, col1, l2, c2)
end
self:set_selections(sidx, line1, col1)
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end
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self:merge_cursors(idx)
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end
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function Doc:delete_to(...) return self:delete_to_cursor(nil, ...) end
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function Doc:move_to_cursor(idx, ...)
for sidx, line, col in self:get_selections(false, idx) do
self:set_selections(sidx, self:position_offset(line, col, ...))
end
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self:merge_cursors(idx)
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end
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function Doc:move_to(...) return self:move_to_cursor(nil, ...) end
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function Doc:select_to_cursor(idx, ...)
for sidx, line, col, line2, col2 in self:get_selections(false, idx) do
line, col = self:position_offset(line, col, ...)
self:set_selections(sidx, line, col, line2, col2)
end
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self:merge_cursors(idx)
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end
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function Doc:select_to(...) return self:select_to_cursor(nil, ...) end
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function Doc:get_indent_string()
local indent_type, indent_size = self:get_indent_info()
if indent_type == "hard" then
return "\t"
end
return string.rep(" ", indent_size)
end
-- returns the size of the original indent, and the indent
-- in your config format, rounded either up or down
function Doc:get_line_indent(line, rnd_up)
local _, e = line:find("^[ \t]+")
local indent_type, indent_size = self:get_indent_info()
local soft_tab = string.rep(" ", indent_size)
if indent_type == "hard" then
local indent = e and line:sub(1, e):gsub(soft_tab, "\t") or ""
return e, indent:gsub(" +", rnd_up and "\t" or "")
else
local indent = e and line:sub(1, e):gsub("\t", soft_tab) or ""
local number = #indent / #soft_tab
return e, indent:sub(1,
(rnd_up and math.ceil(number) or math.floor(number))*#soft_tab)
end
end
-- un/indents text; behaviour varies based on selection and un/indent.
-- * if there's a selection, it will stay static around the
-- text for both indenting and unindenting.
-- * if you are in the beginning whitespace of a line, and are indenting, the
-- cursor will insert the exactly appropriate amount of spaces, and jump the
-- cursor to the beginning of first non whitespace characters
-- * if you are not in the beginning whitespace of a line, and you indent, it
-- inserts the appropriate whitespace, as if you typed them normally.
-- * if you are unindenting, the cursor will jump to the start of the line,
-- and remove the appropriate amount of spaces (or a tab).
function Doc:indent_text(unindent, line1, col1, line2, col2)
local text = self:get_indent_string()
local _, se = self.lines[line1]:find("^[ \t]+")
local in_beginning_whitespace = col1 == 1 or (se and col1 <= se + 1)
local has_selection = line1 ~= line2 or col1 ~= col2
if unindent or has_selection or in_beginning_whitespace then
local l1d, l2d = #self.lines[line1], #self.lines[line2]
for line = line1, line2 do
local e, rnded = self:get_line_indent(self.lines[line], unindent)
self:remove(line, 1, line, (e or 0) + 1)
self:insert(line, 1,
unindent and rnded:sub(1, #rnded - #text) or rnded .. text)
end
l1d, l2d = #self.lines[line1] - l1d, #self.lines[line2] - l2d
if (unindent or in_beginning_whitespace) and not has_selection then
local start_cursor = (se and se + 1 or 1) + l1d or #(self.lines[line1])
return line1, start_cursor, line2, start_cursor
end
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return line1, col1 + l1d, line2, col2 + l2d
end
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self:insert(line1, col1, text)
return line1, col1 + #text, line1, col1 + #text
end
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-- For plugins to add custom actions of document change
function Doc:on_text_change(type)
end
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-- For plugins to get notified when a document is closed
function Doc:on_close()
core.log_quiet("Closed doc \"%s\"", self:get_name())
end
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return Doc