168 lines
4.4 KiB
Lua
168 lines
4.4 KiB
Lua
local M = {}
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M.__index = M
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M.get_width = vim.fn.strwidth
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---@alias block table add_hl(key, hl_name)
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---返回分配的块状区域, e_col 设置为-1则为末尾
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---@param s_row integer 起始行
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---@param s_col integer 起始列
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---@param height integer 行数
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---@param width integer 块的宽度
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---@return block
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function M:alloc_block(s_row, s_col, height, width)
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-- -1为到行尾
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width = width == -1 and self.width or width
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local e_col = s_col + width
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local block = {
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add_hl = function(key, hl_name)
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table.insert(self.highlight[s_row + key], {
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name = hl_name,
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_start = s_col,
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_end = e_col,
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})
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end
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}
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return setmetatable(block, {
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-- 访问该表的操作, 映射成lines
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__index = function(_, key)
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assert(0 < key and key <= height)
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--- FIXME : Unicode stirng sub
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return self.lines[s_row + key]:sub(s_col, e_col)
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end,
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__newindex = function(_, key, value)
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assert(0 < key and key <= height)
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local wid = self.get_width(value)
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if wid > width then
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error('check out the str width: Max ->' .. self.width .. ' str ->' .. wid)
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else
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value = value .. (' '):rep(width - wid)
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end
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local line = s_row + key - 1
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self.lines[line] = self.lines[line]:sub(1, s_col - 1) .. value .. self.lines[line]:sub(e_col + 1)
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end,
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})
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end
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function M:alloc_items()
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local items = {}
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local width = 0 -- 所有item的总width
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local size = 0 -- item数目
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return {
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add_item = function(item, highlight)
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size = size + 1
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local wid = self.get_width(item)
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items[size] = { item, highlight }
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width = width + wid
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end,
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load = function()
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self.len = self.len + 1
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local space = math.floor((self.width - width) / (size - 1))
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assert(space > 0)
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local interval = (' '):rep(space)
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local value = ''
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local function load_item(index)
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if items[index][2] then
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table.insert(self.highlights[self.len], {
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name = items[index][2],
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_start = #value,
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_end = #value + #items[index][1],
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})
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end
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value = value .. items[index][1]
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end
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load_item(1)
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for i = 2, size do
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value = value .. interval
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load_item(i)
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end
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self.lines[self.len] = value
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end
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}
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end
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---返回新行的包装函数
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---@return function
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function M:text_wrapper()
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local l = self.len + 1 -- 取出当前行
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self.lines[l] = ''
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self.len = l
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return function(text, highlight)
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if highlight then
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local _start = #self.lines[l]
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local _end = _start + #text
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table.insert(self.highlights[l], {
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name = highlight,
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_start = _start,
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_end = _end,
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})
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end
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self.lines[l] = self.lines[l] .. text
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end
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end
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function M:addline(text, highlight)
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assert(text, 'empty text')
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self.len = self.len + 1
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if highlight then
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table.insert(self.highlights[self.len], {
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name = highlight,
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_start = 0,
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_end = -1
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})
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end
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self.lines[self.len] = text
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end
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function M:new(width)
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vim.validate {
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width = { width, 'n' }
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}
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local default = (' '):rep(width) -- default value is empty line
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local new_content = {
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width = width,
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len = 0,
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highlights = setmetatable({}, { -- always has default value
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__index = function(tbl, key)
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tbl[key] = {}
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return tbl[key]
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end
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}),
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}
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new_content.lines = setmetatable({}, {
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__index = function(tbl, key)
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tbl[key] = default
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return tbl[key]
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end,
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__newindex = function(tbl, key, value)
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assert(value, 'add no value as new line')
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for i = new_content.len + 1, key - 1 do
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rawset(tbl, i, '')
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end
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rawset(tbl, key, value)
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new_content.len = key
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end
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})
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return setmetatable(new_content, M)
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end
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function M:clear()
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require('table.clear')(self)
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end
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return M
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