406 lines
12 KiB
Lua
406 lines
12 KiB
Lua
--
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-- Web-based formspec editor
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--
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-- Copyright © 2020 by luk3yx.
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as
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-- published by the Free Software Foundation, either version 3 of the
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-- License, or (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <https://www.gnu.org/licenses/>.
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--
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-- Load formspec_ast
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FORMSPEC_AST_PATH = 'formspec_ast'
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dofile(FORMSPEC_AST_PATH .. '/init.lua')
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-- Load fs51 to allow formspec_version[1] exports
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FS51_PATH = 'fs51'
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dofile(FS51_PATH .. '/init.lua')
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-- Load the JSON interoperability code
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dofile('json.lua')
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js = require 'js'
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window = js.global
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document = window.document
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renderer = {}
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-- Render formspecs to HTML
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local elems = {}
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local function update(src, dest)
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for k, v in pairs(src) do
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if type(v) == 'table' and dest[k] then
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update(dest[k], v)
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else
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dest[k] = v
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end
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end
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end
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local function make(elem_type, props, attrs)
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local elem = document:createElement(elem_type)
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if props then
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update(props, elem)
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end
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if attrs then
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for k, v in pairs(attrs) do
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elem:setAttribute(k:gsub('_', '-'), v)
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end
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end
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return elem
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end
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renderer.make = make
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function elems.label(node)
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return make('span', {
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textContent = node.label,
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}, {
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data_text = node.label,
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})
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end
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function elems.button(node)
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return make('div', {
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textContent = node.label,
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})
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end
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elems.button_exit = elems.button
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function elems.image_button(node)
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local res = make('div', nil, {
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data_drawborder = tostring(node.drawborder ~= false),
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})
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res:appendChild(renderer.make_image(node.texture_name, true))
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res:appendChild(make('span', {textContent = node.label}))
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return res
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end
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elems.image_button_exit = elems.image_button
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local function make_field(input_type, node, base, default_callbacks)
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local res = make('div')
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res:appendChild(make('span', {textContent = node.label}))
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local input = make('input', nil, {
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type = input_type,
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value = node.default or '',
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})
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if default_callbacks then
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input:setAttribute('readonly', 'readonly')
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end
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res:appendChild(input)
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return res
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end
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function elems.field(...)
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return make_field('text', ...)
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end
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function elems.pwdfield(...)
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return make_field('password', ...)
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end
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function elems.textarea(node, base, default_callbacks)
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local res = make('div')
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res:appendChild(make('span', {textContent = node.label}))
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local textarea = make('textarea', nil, {
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type = 'text',
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})
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textarea.textContent = node.default or ''
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if default_callbacks then
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textarea:setAttribute('readonly', 'readonly')
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end
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res:appendChild(textarea)
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return res
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end
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function elems.size(node, base, default_callbacks, scale)
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base.style.width = (node.w * scale) .. 'px'
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base.style.height = (node.h * scale) .. 'px'
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base:setAttribute('data-w', tostring(node.w))
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base:setAttribute('data-h', tostring(node.h))
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end
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function elems.image(node)
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return renderer.make_image(node.texture_name)
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end
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function elems.checkbox(node, base, default_callbacks)
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local checked = node.selected
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local div = make('div', nil, {data_checked = tostring(checked)})
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div:appendChild(make('div'))
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div:appendChild(make('span', {textContent = node.label}))
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if not default_callbacks then
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div:addEventListener('click', function()
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checked = not checked
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div:setAttribute('data-checked', tostring(checked))
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end)
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end
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return div
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end
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function elems.list(node, base, default_callbacks)
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local w, h = math.floor(node.w), math.floor(node.h)
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local res = make('table')
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for y = 1, h do
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local tr = make('tr')
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for x = 1, w do
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tr:appendChild(make('td'))
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end
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res:appendChild(tr)
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end
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res.style.left = node.x .. 'em'
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res.style.top = node.y .. 'em'
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res.style.width = (node.w * 1.25) .. 'em'
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res.style.height = (node.h * 1.25) .. 'em'
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return res, true
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end
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function elems.box(node)
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local res = make('div')
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res.style.backgroundColor = node.color
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if node.color:find('^ *rgb[^a]') or
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node.color:find('^ *#..[^ ] *$') or
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node.color:find('^ *#.....[^ ] *$') then
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res.style.opacity = '0.55'
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end
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return res
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end
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function elems.textlist(node)
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local res = make('div')
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for i, item in ipairs(node.listelem) do
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local elem = make('div')
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if item:sub(1, 1) ~= '#' then
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elem.textContent = item
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elseif item:sub(2, 2) == '#' then
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elem.textContent = item:sub(2)
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else
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elem.style.color = item:sub(1, 7)
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elem.textContent = item:sub(8)
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end
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if elem.textContent == '' then
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elem.innerHTML = ' '
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end
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if i == node.selected_idx then
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elem.style.background = '#467832';
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end
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res:appendChild(elem)
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end
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if node.transparent then
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res.style.background = 'none'
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res.style.borderColor = 'transparent'
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end
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return res
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end
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-- Make images - This uses HDX to simplify things
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local image_baseurl = 'https://gitlab.com/VanessaE/hdx-128/raw/master/'
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function renderer.make_image(name, allow_empty)
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-- Remove extension
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local real_name = name:match('^(.*)%.[^%.]+$') or ''
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-- Make an <img> element
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local img = document:createElement('img')
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local mode = 'png'
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img:setAttribute('ondragstart', 'return false')
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if name == '' and allow_empty then
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img.style.opacity = '0'
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return img
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end
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img:addEventListener('error', function()
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if mode == 'png' then
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mode = 'jpg'
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elseif mode == nil then
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return
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else
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mode = nil
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img.src = image_baseurl .. 'unknown_node.png'
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return
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end
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img.src = image_baseurl .. real_name .. '.' .. mode
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end)
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img.src = image_baseurl .. real_name .. '.' .. mode
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return img
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end
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function renderer.render_ast(tree, callbacks, store_json, scale)
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scale = 50 * (scale or 1)
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local base = document:createElement('div')
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base.className = 'formspec_ast-base'
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base.style.fontSize = scale .. 'px'
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local container = document:createElement('div')
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base:appendChild(container)
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for _, node in ipairs(formspec_ast.flatten(tree)) do
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if not elems[node.type] then
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return nil, 'Formspec element type ' .. node.type ..
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' not implemented.'
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end
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local e, ignore_pos = elems[node.type](node, base, callbacks == nil,
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scale)
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if e then
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if node.x and node.y and not ignore_pos then
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e.style.left = (node.x * scale) .. 'px'
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e.style.top = (node.y * scale) .. 'px'
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if node.w and node.h then
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e.style.width = (node.w * scale) .. 'px'
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e.style.height = (node.h * scale) .. 'px'
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end
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end
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e.className = 'formspec_ast-element formspec_ast-' .. node.type
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if store_json or store_json == nil then
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e:setAttribute('data-formspec_ast', json.dumps(node))
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end
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if node.name then
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e:setAttribute('data-formspec_ast-name', node.name)
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end
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local func
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if type(callbacks) == 'table' then
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func = callbacks[node.name or '']
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elseif callbacks == nil then
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func = renderer.default_callback
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end
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if func then
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e:addEventListener('click', func)
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e.className = e.className .. ' formspec_ast-clickable'
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end
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container:appendChild(e)
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end
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end
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container.style.width = base.style.width
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container.style.height = base.style.height
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return base
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end
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function renderer.render_formspec(formspec, ...)
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local tree, err = formspec_ast.parse(formspec)
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if err then
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return nil, err
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end
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return renderer.render_ast(tree, ...)
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end
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function renderer.elem_to_ast(elem)
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assert(elem.children.length == 1)
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local html_elems = elem.firstChild.children
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local w = tonumber(elem:getAttribute('data-w'))
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local h = tonumber(elem:getAttribute('data-h'))
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local res = {
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formspec_version = 2,
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{
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type = 'size',
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w = w or 0,
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h = h or 0,
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}
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}
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for i = 0, html_elems.length - 1 do
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local data = html_elems[i]:getAttribute('data-formspec_ast')
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local node = assert(json.loads(data), 'Error loading data!')
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if not node._transient then
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if node.name == 'size' then
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-- A hack to replace the existing size[] with any new one
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res[2] = node
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else
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res[#res + 1] = node
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end
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end
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end
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return res
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end
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function renderer.replace_formspec(elem, tree)
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local new_elem, err = renderer.render_ast(tree)
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if not new_elem then return nil, err end
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elem:replaceWith(new_elem)
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return new_elem, nil
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end
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function renderer.redraw_formspec(elem)
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renderer.replace_formspec(elem, renderer.elem_to_ast(elem))
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end
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function renderer.unrender_formspec(elem)
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local res = renderer.elem_to_ast(elem)
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return formspec_ast.unparse(res)
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end
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local load = rawget(_G, 'loadstring') or load
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local function deserialize(code)
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if code:byte(1) == 0x1b then return nil, 'Cannot load bytecode' end
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code = 'return ' .. code
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local f
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if rawget(_G, 'loadstring') and rawget(_G, 'setfenv') then
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f = loadstring(code)
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setfenv(f, {})
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else
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f = load(code, nil, nil, {})
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end
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local ok, res = pcall(f)
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if ok then
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return res, nil
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else
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return nil, res
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end
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end
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function renderer.import(fs, opts)
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if opts.format then
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fs = fs:gsub('" %.%. minetest.formspec_escape%(tostring%(' ..
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'%-%-%[%[${%]%]([^}]*)%-%-%[%[}%]%]%)%) %.%. "', function(s)
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return '${' .. ('%q'):format(s):sub(2, -2) .. '}'
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end)
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local err
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fs, err = deserialize(fs)
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if type(fs) ~= 'string' then
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return nil, err or 'That was valid Lua but not a valid formspec!'
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end
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elseif fs:sub(1, 1) == '"' then
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return nil, 'Did you mean to enable ${...} conversion?'
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end
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local tree, err = formspec_ast.parse(fs)
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if tree and tree.formspec_version < 2 then
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return nil, 'Only formspec versions >= 2 can be loaded!'
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end
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return tree, err
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end
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function renderer.export(tree, opts)
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if opts.use_v1 then
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tree = fs51.backport(tree)
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end
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local fs, err = formspec_ast.unparse(tree)
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if not fs then return nil, err end
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if opts.format then
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fs = ('%q'):format(fs)
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local ok, msg = true, ''
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fs = fs:gsub('${([^}]*)}', function(code)
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code = assert(deserialize('"' .. code .. '"'))
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if code:byte(1) == 0x1b then
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ok, msg = false, 'Bytecode not permitted in format strings'
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elseif ok then
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ok, msg = load('return ' .. code)
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end
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-- This adds markers before and after the code so it can be
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-- extracted easily in renderer.import().
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return '" .. minetest.formspec_escape(tostring(--[[${]]' .. code ..
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'--[[}]])) .. "'
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end)
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if not ok then
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return nil, msg
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end
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end
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return fs, nil
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end
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