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xmodule.js
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xmodule.js
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/*
Persistence for widget-based self-editing UIs.
Written by Cosmin Apreutesei. Public Domain.
*/
(function () {
"use strict"
let G = window
G.init_xmodule = function(opt) {
opt = opt || {layers: []}
let xm = {}
G.xmodule = xm // singleton.
let generation = 1
xm.root_widget = null
xm.slots = opt.slots || obj() // {name -> {color:, }}
xm.modules = opt.modules || obj() // {name -> {icon:, }}
xm.layers = obj() // {name -> {name:, props: {id -> {k -> v}}}}
xm.instances = obj() // {id -> [e1,...]}
xm.selected_module = null
xm.selected_slot = null
xm.active_layers = obj() // {'module:slot' -> layer} in override order
// init & changing root widget --------------------------------------------
function get_root_module_layer() {
let layer = xm.get_active_layer(opt.root_module, 'base')
if (!layer) {
warn('layer not found for root module', opt.root_module)
return
}
return layer
}
function init_root_widget() {
if (!opt.root_module)
return
let layer = get_root_module_layer()
let root_id = layer && layer.root_id
if (layer && !root_id)
warn('root_id not found in root module layer')
xm.set_root_widget(root_id && element(root_id), false)
}
window.init_root_widget = init_root_widget
xm.set_root_widget = function(root_widget, noupdate) {
xm.root_container = opt.root_container
&& $(opt.root_container)[0] || document.body
root_widget = root_widget || widget_placeholder({module: opt.root_module})
let old_root_widget = xm.root_widget
xm.root_widget = root_widget
xm.root_container.replace(old_root_widget, root_widget)
if (opt.root_module) {
let layer = get_root_module_layer()
if (!layer)
return
layer.props['<root>'] = root_widget.id
layer.modified = !!noupdate
}
}
// init prop layer slots --------------------------------------------------
function slot_name(s) { assert(s.search(/[:]/) == -1); return s }
function module_name(s) { assert(s.search(/[_:\d]/) == -1); return s }
xm.get_active_layer = function(module, slot) {
return xm.active_layers[module+':'+slot]
}
function set_active_layer(module, slot, layer) {
let s = module_name(module)+':'+slot_name(slot)
let layer0 = xm.active_layers[s]
let layer1 = get_layer(layer)
xm.active_layers[s] = layer1
return [layer0, layer1]
}
function init_prop_layers() {
for (let t of opt.layers)
set_active_layer(t.module, t.slot, t.layer)
announce('prop_layer_slots_changed')
}
// loading layer prop vals into instances ---------------------------------
function prop_vals(id) {
let pv = obj()
let layer0
for (let k in xm.active_layers) {
let layer = xm.active_layers[k]
if (layer != layer0) {
assign_opt(pv, layer.props[id])
layer0 = layer
}
}
delete pv.tag
return pv
}
component.instance_tag = function(id) {
for (let k in xm.active_layers) {
let props = xm.active_layers[k].props[id]
if (props && props.tag)
return props.tag
}
}
component.init_instance = function(e, opt) {
let pv
opt.id = opt.id || e.id
if (!opt.id) {
delete opt.id
// ^^ because `e.id = ''` sets the id attribute instead of removing it.
// && because `e.id = null` sets the id to "null" so we can't win.
}
if (opt.id == '<new>') {
assert(e.tag)
assert(opt.module)
opt.id = xm.next_id(opt.module)
xm.set_val(null, opt.id, 'tag', e.tag, null, null, null, opt.module)
pv = empty_obj
} else if (opt.id) {
pv = prop_vals(opt.id)
opt.module = opt.id.match(/^[^_\d]+/)[0]
}
// Set init values as default values, which assumes that init values
// i.e. html attrs as well as values passed to (or returned from) the
// component init function are static!
// If instead these values are dynamic for the same id, then they
// won't be saved right! To fix that, set nodefault="prop1 ..."
// for the props that don't have a static default value.
e.xoff()
for (let k in opt)
e.set_prop(k, opt[k])
e.xon()
if (e.id) {
e.xmodule_generation = generation
e.__nodefault = opt.nodefault ? set(words(opt.nodefault)) : empty_set
// override prop vals.
e.__pv0 = obj()
for (let k in pv)
e.set_prop(k, pv[k])
}
}
function update_instance(e) {
if (e.xmodule_generation == generation)
return
assert(e.id)
e.xmodule_generation = generation
e.xoff()
let pv = prop_vals(e.id)
let pv0 = attr(e, '__pv0') // initial vals of overridden props.
// restore prop vals that are not present in this override.
for (let k in pv0)
if (!(k in pv)) {
e.set_prop(k, pv0[k])
delete pv0[k]
}
// apply this override, saving current vals that were not saved before.
for (let k in pv) {
if (!(k in pv0))
pv0[k] = e.get_prop(k)
e.set_prop(k, pv[k])
}
e.xon()
}
xm.bind_instance = function(e, on) {
assert(e.id)
if (on) {
attr(xm.instances, e.id, array).push(e)
update_instance(e)
} else {
let t = xm.instances[e.id]
t.remove_value(e)
if (!t.length)
delete xm.instances[e.id]
}
}
listen('bind', function(e, on) {
xm.bind_instance(e, on)
})
// saving prop vals into prop layers --------------------------------------
xm.prop_module_slot_layer = function(e, prop) {
let attrs = e.get_prop_attrs(prop)
let slot = xm.selected_slot || attrs.slot || 'base'
let module = xm.selected_module || attrs.module
let layer = xm.active_layers[module+':'+slot]
return [module, slot, layer]
}
let debug_msgs = obj()
xm.set_val = function(e, id, k, v, v0, dv, slot, module, serialize) {
slot = xm.selected_slot || slot || 'base'
if (slot == 'none')
return
module = xm.selected_module || module
let layer = module && xm.active_layers[module+':'+slot]
if (v === dv && !e.__nodefault.has(k))
v = undefined // don't save defaults.
else if (serialize)
v = serialize.call(e, k, v)
if (!layer) {
if (module)
debug_msgs[id+'.'+k] = 'prop-val-lost ['+module+':'+slot+'] '
+id+'.'+k+' '+(repl(v, undefined, '[remove]'))
return
}
let t = attr(layer.props, id)
if (t[k] === v) // value already stored.
return
layer.modified = true
let pv0 = e && attr(e, '__pv0')
if (v === undefined) { // `undefined` signals removal.
if (k in t) {
debug_msgs[id+'.'+k] = 'prop-val-deleted ['+module+':'+slot+'='+layer.name+'] '+id+' '+k
delete t[k]
if (pv0)
delete pv0[k] // no need to keep this anymore.
}
} else {
if (pv0 && !(k in pv0)) // save current val if it wasn't saved before.
pv0[k] = v0
t[k] = v
debug_msgs[id+'.'+k] = 'prop-val-set ['+module+':'+slot+'='+layer.name+'] '+id+' '+k+' '+json(v)
}
// synchronize other instances of this id.
let instances = xm.instances[id] || empty_array
for (let e1 of instances) {
if (e1 != e) {
e1.xoff()
let pv0 = attr(e1, '__pv0')
if (!(k in pv0)) // save current val if it wasn't saved before.
pv0[k] = e1.get_prop(k)
e1.set_prop(k, v)
e1.xon()
}
}
}
listen('prop_changed', function(e, k, v, v0) {
if (!e.id)
return
let pa = e.get_prop_attrs(k)
if (!pa || pa.private)
return
xm.set_val(e, e.id, k, v, v0, pa.default, pa.slot, e.module, e.serialize_prop)
})
// loading prop layers and assigning to slots -----------------------------
xm.set_layer = function(module, slot, layer, opt) {
opt = opt || empty
generation++
let [layer0, layer1] = set_active_layer(module, slot, layer)
if (opt.update_instances !== false) {
let ids1 = layer1 && layer1.props
let ids0 = layer0 && layer0.props
for (let id in xm.instances)
if ((ids1 && ids1[id]) || (ids0 && ids0[id]))
for (let e of xm.instances[id])
update_instance(e)
if (module && slot)
announce('prop_layer_slots_changed')
}
}
// id generation ---------------------------------------------------------
xm.next_id = function(module) {
let ret_id
ajax({
url: '/xmodule-next-id/'+assert(module),
method: 'post',
async: false,
success: id => ret_id = id,
})
return ret_id
}
// loading & saving prop layers -------------------------------------------
function get_layer(name) {
let t = xm.layers[name]
if (!t) {
let props
if (name.starts('local:')) {
let shortname = name.replace(/^local\:/, '')
props = json_arg(load('xmodule-layers/'+shortname))
} else {
ajax({
url: '/xmodule-layer.json/'+name,
async: false,
success: function(props1) {
props = props1
},
fail: function(err, how, status) {
assert(how == 'http' && status == 404)
},
})
}
t = {name: name, props: props || obj()}
t.root_id = t.props['<root>']
xm.layers[name] = t
}
return t
}
xm.save = function() {
for (let k in debug_msgs)
debug(debug_msgs[k])
debug_msgs = obj()
for (let name in xm.layers) {
let t = xm.layers[name]
if (t.modified) {
function saved() {
debug('layer-saved', name)
t.modified = false
}
if (name.starts('local:')) {
let shortname = name.replace(/^local\:/, '')
save('xmodule-layers/'+shortname, json(t.props))
saved(t)
} else if (!t.save_request) {
t.save_request = ajax({
url: '/xmodule-layer.json/'+name,
upload: json(t.props, null, '\t'),
headers: {'content-type': 'application/json'},
done: () => t.save_request = null,
success: saved,
})
}
}
}
}
init_prop_layers()
}
}()) // module function