prosody
f33887f925e1
util/interpolation.lua

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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936cf2f7531f util.interpolation: A template engine for text
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1 -- Simple template language
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2 --
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3 -- The new() function takes a pattern and an escape function and returns
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4 -- a render() function. Both are required.
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5 --
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6 -- The function render() takes a string template and a table of values.
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7 -- Sequences like {name} in the template string are substituted
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8 -- with values from the table, optionally depending on a modifier
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9 -- symbol.
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10 --
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11 -- Variants are:
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12 -- {name} is substituted for values["name"] and is escaped using the
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13 -- second argument to new_render(). To disable the escaping, use {name!}.
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14 -- {name.item} can be used to access table items.
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15 -- To renter lists of items: {name# item number {idx} is {item} }
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16 -- Or key-value pairs: {name% t[ {idx} ] = {item} }
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17 -- To show a defaults for missing values {name? sub-template } can be used,
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18 -- which renders a sub-template if values["name"] is false-ish.
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19 -- {name& sub-template } does the opposite, the sub-template is rendered
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20 -- if the selected value is anything but false or nil.
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21
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22 local type, tostring = type, tostring;
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23 local pairs, ipairs = pairs, ipairs;
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24 local s_sub, s_gsub, s_match = string.sub, string.gsub, string.match;
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25 local t_concat = table.concat;
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26
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27 local function new_render(pat, escape, funcs)
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28 -- assert(type(pat) == "string", "bad argument #1 to 'new_render' (string expected)");
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29 -- assert(type(escape) == "function", "bad argument #2 to 'new_render' (function expected)");
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30 local function render(template, values)
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31 -- assert(type(template) == "string", "bad argument #1 to 'render' (string expected)");
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32 -- assert(type(values) == "table", "bad argument #2 to 'render' (table expected)");
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33 return (s_gsub(template, pat, function (block)
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34 block = s_sub(block, 2, -2);
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35 local name, raw, opt, e = s_match(block, "^([%a_][%w_.]*)(!?)(%p?)()");
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36 if not name then return end
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37 local value = values[name];
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38 if not value and name:find(".", 2, true) then
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39 value = values;
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40 for word in name:gmatch"[^.]+" do
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41 value = value[word];
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42 if not value then break; end
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43 end
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44 end
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45 if funcs then
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46 while opt == '|' do
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47 local f;
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48 f, raw, opt, e = s_match(block, "^([%a_][%w_.]*)(!?)(%p?)()", e);
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49 f = funcs[f];
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50 if value ~= nil and f then value = f(value); end
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51 end
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52 end
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53 if opt == '#' or opt == '%' then
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54 if type(value) ~= "table" then return ""; end
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55 local iter = opt == '#' and ipairs or pairs;
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56 local out, i, subtpl = {}, 1, s_sub(block, e);
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57 local subvalues = setmetatable({}, { __index = values });
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58 for idx, item in iter(value) do
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59 subvalues.idx = idx;
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60 subvalues.item = item;
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61 out[i], i = render(subtpl, subvalues), i+1;
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62 end
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63 return t_concat(out);
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64 elseif opt == '&' then
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65 if not value then return ""; end
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66 return render(s_sub(block, e), values);
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67 elseif opt == '~' then
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68 if value then return ""; end
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69 return render(s_sub(block, e), values);
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70 elseif opt == '?' and not value then
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71 return render(s_sub(block, e), values);
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72 elseif value ~= nil then
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73 if type(value) ~= "string" then
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74 value = tostring(value);
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75 end
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76 if raw ~= '!' then
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77 return escape(value);
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78 end
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79 return value;
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80 end
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81 end));
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82 end
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83 return render;
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84 end
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85
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86 return {
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87 new = new_render;
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88 };