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webb_spa.lua
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webb_spa.lua
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--[==[
webb | single-page apps
Written by Cosmin Apreutesei. Public Domain.
API
client_config(name, [default]) make config value available on client-side
cssfile(files) add one or more css files to all.css
jsfile(files) add one or more js files to all.js
fontfile(files) add one or more font files to the preload list
htmlfile(files) add one or more html files to _all.html
css(s) add css code to inline.css
js(s) add js code to inline.js
html(s) add inline html code to the SPA body
spa_action() SPA action
ACTIONS
config.js expose required config() values
strings.js load strings.<lang>.js
all.js output of jsfile() calls
all.css output of cssfile() calls
_all.html output of htmlfile() calls
inline.js output of js() calls
inline.css output of css() calls
_inline.html output of html() calls
<root-action> spa_response
LOADS
glue, webb_spa, mustache
CONFIG
js_mode 'separate' 'bundle' | 'ref' | 'separate'
css_mode 'separate' 'bundle' | 'ref' | 'separate'
body_classes css classes for <body>
body_attrs attributes for <body>
head content for <head>
page_title_suffix title suffix, both client-side & server-side
infer_page_title server-side page title inferring f(body) -> s
favicon_href favicon url
client_action true enable client routing.
aliases aliases for client-side routing; defined in webb_action.
]==]
require'webb_action'
require'lang'
local client_configs = {}
function client_config(name, default)
if not client_configs[name] then
client_configs[name] = true
add(client_configs, name)
end
return config(name, default)
end
client_config'app_name'
client_config'multilang'
client_config'default_lang'
client_config'aliases'
client_config'root_action'
client_config'page_title_suffix'
client_config'session_cookie_name'
--pass required config values to the client
action['config.js'] = function()
--required config values must be initialized.
--NOTE: these must match the real defaults that are set in their places of usage.
config('app_name', scriptname)
config('default_lang', 'en')
config('root_action', 'en')
config('page_title_suffix', ' - '..host())
config('session_cookie_name', 'session')
for i,k in ipairs(client_configs) do
local v = config(k)
if v ~= nil then
out(format('config(%s, %s)\n', json_encode(k), json_encode(v)))
end
end
end
action['strings.js'] = function()
local t = S_texts(lang(), 'js')
if isempty(t) then return end
out'assign(S_texts, '; out(json_encode(t)); out')'
end
--simple API to add js and css snippets and files from server-side code
local function sepbuffer(sep, onadd)
local buf = stringbuffer()
return function(s, sz)
if s then
buf(s, sz)
buf(sep)
if onadd then onadd(s, sz) end
else
return buf()
end
end
end
cssfile = sepbuffer'\n'
wwwfile['all.css.cat'] = function()
return cssfile() .. ' inline.css' --append inline code at the end
end
jsfile = sepbuffer('\n', function(files)
for _,file in ipairs(catlist_files(files)) do
if not action[file] then --won't run actions for this.
S_ids_add_js(file, wwwfile(file))
end
end
end)
wwwfile['all.js.cat'] = function()
return jsfile() .. ' inline.js' --append inline code at the end
end
htmlfile = sepbuffer('\n', function(files)
for _,file in ipairs(catlist_files(files)) do
if not action[file] then --won't run actions for this.
S_ids_add_html(file, wwwfile(file))
end
end
end)
wwwfile['_all.html.cat'] = function()
return htmlfile() .. '\n_inline.html'
end
local fontfiles = {}
function fontfile(file)
for file in file:gmatch'[^%s]+' do
add(fontfiles, file)
end
end
css = sepbuffer'\n'
wwwfile['inline.css'] = function()
return css()
end
js = sepbuffer(';\n', function(s)
S_ids_add_js('inline.js', s)
end)
wwwfile['inline.js'] = function()
return js()
end
html = sepbuffer('\n', function(s)
S_ids_add_html('_inline.html', s)
end)
wwwfile['_inline.html'] = function()
return html()
end
jsfile[[
glue.js // from canvas-ui, webb_spa.js uses it.
webb_spa.js
config.js // config passed along from server
strings.js // strings in current language to use with S()
mustache.js
]]
--format js and css refs as separate refs or as a single ref based on a .cat action.
--NOTE: with `embed` mode, urls in css files must be absolute paths!
local function jslist(cataction, mode, attrs)
attrs = attrs or ''
if mode == 'bundle' then
out(format(' <script src="%s" %s></script>', href('/'..cataction), attrs))
elseif mode == 'embed' then
out('<script %s>', attrs)
outcatlist(cataction..'.cat')
out'</script>\n'
elseif mode == 'separate' then
for i,file in ipairs(catlist_files(wwwfile(cataction..'.cat'))) do
out(format(' <script src="%s" %s></script>\n', href('/'..file), attrs))
end
else
assert(false)
end
end
local function csslist(cataction, mode)
if mode == 'bundle' then
out(format('\t<link rel="stylesheet" type="text/css" href="/%s">', href(cataction)))
elseif mode == 'embed' then
out'<style>'
outcatlist(cataction..'.cat')
out'</style>\n'
elseif mode == 'separate' then
for i,file in ipairs(catlist_files(wwwfile(cataction..'.cat'))) do
out(format('\t<link rel="stylesheet" type="text/css" href="%s">\n', href('/'..file)))
end
else
assert(false)
end
end
local function preloadlist()
for i,file in ipairs(fontfiles) do
local file_ext = file:match'%.([^%.]+)$'
out(format('\t<link rel="preload" href="%s" as="font" type="font/%s" crossorigin>\n',
href('/'..file), file_ext))
end
end
--main template gluing it all together
local spa_template = [[
<!DOCTYPE html>
<html lang={{lang}} country={{country}} {{#theme}}theme={{theme}}{{/theme}}>
<head>
<meta charset=utf-8>
<title>{{title}}{{title_suffix}}</title>
{{#favicon_href}}<link rel="icon" href="{{favicon_href}}">{{/favicon_href}}
{{{all_css}}}
{{{preload}}}
{{{all_js}}}
{{{head}}}
{{{templates}}}
<script>
var client_action = {{client_action}}
</{{undefined}}script>
</head>
<body {{body_attrs}} class="{{body_classes}}">
{{{body}}}
</body>
</html>
]]
local function page_title(infer, body)
return infer and infer(body)
--infer it from the name of the action
or (args(1) or ''):gsub('[-_]', ' ')
end
function spa_action()
local t = {}
if _G.login then
if try_login() then --sets lang from user profile.
t.theme = usr'theme'
end
end
t.lang = lang()
t.country = country()
local html = record(outcatlist, '_all.html.cat')
--remove static resource loading used for working without a server.
html = html:gsub('<base .->', '')
html = html:gsub('<link rel="preload".->', '')
html = html:gsub('<script src=.->.-</script>', '')
t.body = html_filter_lang(html, lang())
t.body_classes = call(config'body_classes')
t.body_attrs = call(config'body_attrs')
t.head = config'head'
t.title = page_title(config'infer_page_title', t.body)
t.title_suffix = config('page_title_suffix', ' - '..host())
t.favicon_href = call(config'favicon_href')
t.client_action = config('client_action', true)
t.all_js = record(jslist , 'all.js' , config('js_mode' , 'separate'), 'glue-global glue-extend 3d-global')
t.all_css = record(csslist, 'all.css', config('css_mode', 'separate'))
t.preload = record(preloadlist)
local buf = stringbuffer()
for _,name in ipairs(template()) do
buf(mustache_wrap(template(name), name))
end
t.templates = buf()
out(render_string(spa_template, t))
end
action[config('root_action', 'en')] = spa_action