lite/data/core/doc/init.lua

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local Object = require "core.object"
local Highlighter = require "core.doc.highlighter"
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
local function splice(t, at, remove, insert)
insert = insert or {}
local offset = #insert - remove
local old_len = #t
if offset < 0 then
for i = at - offset, old_len - offset do
t[i + offset] = t[i]
end
elseif offset > 0 then
for i = old_len, at, -1 do
t[i + offset] = t[i]
end
end
for i, item in ipairs(insert) do
t[at + i - 1] = item
end
end
function Doc:new(filename)
self:reset()
if filename then
self:load(filename)
end
end
function Doc:reset()
self.lines = { "\n" }
self.selection = { a = { line=1, col=1 }, b = { line=1, col=1 } }
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 syn = syntax.get(self.filename or "")
if self.syntax ~= syn then
self.syntax = syn
self.highlighter:invalidate(1)
end
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end
function Doc:load(filename)
local fp = assert( io.open(filename, "rb") )
self:reset()
self.filename = filename
self.lines = {}
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")
end
if #self.lines == 0 then
table.insert(self.lines, "\n")
end
fp:close()
self:reset_syntax()
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end
function Doc:save(filename)
filename = filename or assert(self.filename, "no filename set to default to")
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()
self.filename = filename or self.filename
self:reset_syntax()
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self:clean()
end
function Doc:get_name()
return self.filename or "unsaved"
end
function Doc:is_dirty()
return self.clean_change_id ~= self:get_change_id()
end
function Doc:clean()
self.clean_change_id = self:get_change_id()
end
function Doc:get_change_id()
return self.undo_stack.idx
end
function Doc:set_selection(line1, col1, line2, col2, swap)
assert(not line2 == not col2, "expected 2 or 4 arguments")
if swap then line1, col1, line2, col2 = line2, col2, line1, col1 end
line1, col1 = self:sanitize_position(line1, col1)
line2, col2 = self:sanitize_position(line2 or line1, col2 or col1)
self.selection.a.line, self.selection.a.col = line1, col1
self.selection.b.line, self.selection.b.col = line2, col2
end
local function sort_positions(line1, col1, line2, col2)
if line1 > line2
or line1 == line2 and col1 > col2 then
return line2, col2, line1, col1, true
end
return line1, col1, line2, col2, false
end
function Doc:get_selection(sort)
local a, b = self.selection.a, self.selection.b
if sort then
return sort_positions(a.line, a.col, b.line, b.col)
end
return a.line, a.col, b.line, b.col
end
function Doc:has_selection()
local a, b = self.selection.a, self.selection.b
return not (a.line == b.line and a.col == b.col)
end
function Doc:sanitize_selection()
self:set_selection(self:get_selection())
end
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 push_undo
local function insert(self, undo_stack, time, line, col, text)
line, col = self:sanitize_position(line, col)
-- split text into lines and merge with line at insertion point
local lines = split_lines(text)
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
splice(self.lines, line, 1, lines)
-- push undo
local line2, col2 = self:position_offset(line, col, #text)
push_undo(self, undo_stack, time, "selection", self:get_selection())
push_undo(self, undo_stack, time, "remove", line, col, line2, col2)
-- update highlighter
self.highlighter:invalidate(line)
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end
local function remove(self, undo_stack, time, 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)
-- push undo
local text = self:get_text(line1, col1, line2, col2)
push_undo(self, undo_stack, time, "selection", self:get_selection())
push_undo(self, undo_stack, time, "insert", line1, col1, text)
-- 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
splice(self.lines, line1, line2 - line1 + 1, { before .. after })
-- update highlighter
self.highlighter:invalidate(line1)
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end
function Doc:insert(...)
insert(self, self.undo_stack, system.get_time(), ...)
self:sanitize_selection()
self.redo_stack = { idx = 1 }
end
function Doc:remove(...)
remove(self, self.undo_stack, system.get_time(), ...)
self:sanitize_selection()
self.redo_stack = { idx = 1 }
end
function push_undo(self, 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
local function pop_undo(self, undo_stack, redo_stack)
-- 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
insert(self, redo_stack, cmd.time, table.unpack(cmd))
elseif cmd.type == "remove" then
remove(self, redo_stack, cmd.time, table.unpack(cmd))
elseif cmd.type == "selection" then
self.selection.a.line, self.selection.a.col = cmd[1], cmd[2]
self.selection.b.line, self.selection.b.col = cmd[3], cmd[4]
end
-- 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
return pop_undo(self, undo_stack, redo_stack)
end
end
function Doc:undo()
pop_undo(self, self.undo_stack, self.redo_stack)
end
function Doc:redo()
pop_undo(self, self.redo_stack, self.undo_stack)
end
function Doc:text_input(text)
if self:has_selection() then
self:delete_to()
end
local line, col = self:get_selection()
self:insert(line, col, text)
self:move_to(#text)
end
function Doc:replace(fn)
local line1, col1, line2, col2, swap
local had_selection = self:has_selection()
if had_selection then
line1, col1, line2, col2, swap = self:get_selection(true)
else
line1, col1, line2, col2 = 1, 1, #self.lines, #self.lines[#self.lines]
end
local old_text = self:get_text(line1, col1, line2, col2)
local new_text, n = fn(old_text)
if old_text ~= new_text then
self:insert(line2, col2, new_text)
self:remove(line1, col1, line2, col2)
if had_selection then
line2, col2 = self:position_offset(line1, col1, #new_text)
self:set_selection(line1, col1, line2, col2, swap)
end
end
return n
end
function Doc:delete_to(...)
local line, col = self:get_selection(true)
if self:has_selection() then
self:remove(self:get_selection())
else
local line2, col2 = self:position_offset(line, col, ...)
self:remove(line, col, line2, col2)
line, col = sort_positions(line, col, line2, col2)
end
self:set_selection(line, col)
end
function Doc:move_to(...)
local line, col = self:get_selection()
self:set_selection(self:position_offset(line, col, ...))
end
function Doc:select_to(...)
local line, col, line2, col2 = self:get_selection()
line, col = self:position_offset(line, col, ...)
self:set_selection(line, col, line2, col2)
end
return Doc