prosody
495de404a8ae
util/interpolation.lua

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util/interpolation.lua @ 7567:495de404a8ae

ejabberdsql2prosody: rename variable 'host' to prevent shadowing upvalue [luacheck] Functions roster(), roster_pending(), roster_group(), private_storage() and offline_msg() have argument named "host", which used to shadow upvalue of this variable before this change. Instead of renaming this argument, let's rename the variable to match what the script says in usage: Usage: ejabberdsql2prosody.lua filename.txt hostname
author Anton Shestakov <av6@dwimlabs.net>
date Fri, 12 Aug 2016 13:44:47 +0800
parent 6772:805baeca56b6
child 10348:3852fc91b2fc
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, 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, 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 opt ~= '!' 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 };