prosody
1b657605ea29
util/interpolation.lua

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util/interpolation.lua @ 10864:1b657605ea29

mod_vcard_legacy: Remove semi-broken support for multiple avatars Nobody does this. If someone wants to they should go use the PEP method directly instead. Additionally, this got in the way of doing multiple avatars The PEP Way, since it treated each 'data' as a distinct avatar with an optional corresponding 'metadata', which is not how it works.
author Kim Alvefur <zash@zash.se>
date Mon, 01 Jun 2020 17:37:54 +0200
parent 10348:3852fc91b2fc
child 11064:af1e3b7d9ea3
child 11306:5798ab735619
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 value ~= nil and 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 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 == '?' and not value then
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68 return render(s_sub(block, e), values);
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69 elseif value ~= nil then
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70 if type(value) ~= "string" then
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71 value = tostring(value);
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72 end
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73 if raw ~= '!' then
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74 return escape(value);
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75 end
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76 return value;
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77 end
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78 end));
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79 end
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80 return render;
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81 end
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82
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83 return {
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84 new = new_render;
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85 };