Software /
code /
prosody
File
util/interpolation.lua @ 12828:f33887f925e1
net.server_epoll: Remove delay on last main loop iteration when quitting
Main difference is that timers are not checked unconditionally before
each poll, only when running out of previous poll results (hidden by
util.poll). This removes a final poll at shutdown that usually delays
the 'not quitting' condition check by one second.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Fri, 06 Jan 2023 04:38:39 +0100 |
parent | 11307:f2e276bb4ef8 |
line wrap: on
line source
-- Simple template language -- -- The new() function takes a pattern and an escape function and returns -- a render() function. Both are required. -- -- The function render() takes a string template and a table of values. -- Sequences like {name} in the template string are substituted -- with values from the table, optionally depending on a modifier -- symbol. -- -- Variants are: -- {name} is substituted for values["name"] and is escaped using the -- second argument to new_render(). To disable the escaping, use {name!}. -- {name.item} can be used to access table items. -- To renter lists of items: {name# item number {idx} is {item} } -- Or key-value pairs: {name% t[ {idx} ] = {item} } -- To show a defaults for missing values {name? sub-template } can be used, -- which renders a sub-template if values["name"] is false-ish. -- {name& sub-template } does the opposite, the sub-template is rendered -- if the selected value is anything but false or nil. local type, tostring = type, tostring; local pairs, ipairs = pairs, ipairs; local s_sub, s_gsub, s_match = string.sub, string.gsub, string.match; local t_concat = table.concat; local function new_render(pat, escape, funcs) -- assert(type(pat) == "string", "bad argument #1 to 'new_render' (string expected)"); -- assert(type(escape) == "function", "bad argument #2 to 'new_render' (function expected)"); local function render(template, values) -- assert(type(template) == "string", "bad argument #1 to 'render' (string expected)"); -- assert(type(values) == "table", "bad argument #2 to 'render' (table expected)"); return (s_gsub(template, pat, function (block) block = s_sub(block, 2, -2); local name, raw, opt, e = s_match(block, "^([%a_][%w_.]*)(!?)(%p?)()"); if not name then return end local value = values[name]; if not value and name:find(".", 2, true) then value = values; for word in name:gmatch"[^.]+" do value = value[word]; if not value then break; end end end if funcs then while opt == '|' do local f; f, raw, opt, e = s_match(block, "^([%a_][%w_.]*)(!?)(%p?)()", e); f = funcs[f]; if value ~= nil and f then value = f(value); end end end if opt == '#' or opt == '%' then if type(value) ~= "table" then return ""; end local iter = opt == '#' and ipairs or pairs; local out, i, subtpl = {}, 1, s_sub(block, e); local subvalues = setmetatable({}, { __index = values }); for idx, item in iter(value) do subvalues.idx = idx; subvalues.item = item; out[i], i = render(subtpl, subvalues), i+1; end return t_concat(out); elseif opt == '&' then if not value then return ""; end return render(s_sub(block, e), values); elseif opt == '~' then if value then return ""; end return render(s_sub(block, e), values); elseif opt == '?' and not value then return render(s_sub(block, e), values); elseif value ~= nil then if type(value) ~= "string" then value = tostring(value); end if raw ~= '!' then return escape(value); end return value; end end)); end return render; end return { new = new_render; };