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annotate mod_mam/rsm.lib.lua @ 1782:29f3d6b7ad16

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author Kim Alvefur <zash@zash.se>
date Mon, 24 Aug 2015 16:43:56 +0200
parents 57ee26681561
children
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701
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1 local stanza = require"util.stanza".stanza;
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2 local tostring, tonumber = tostring, tonumber;
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3 local type = type;
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4 local pairs = pairs;
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5
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6 local xmlns_rsm = 'http://jabber.org/protocol/rsm';
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7
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8 local element_parsers = {};
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9
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10 do
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11 local parsers = element_parsers;
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12 local function xs_int(st)
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13 return tonumber((st:get_text()));
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14 end
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15 local function xs_string(st)
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16 return st:get_text();
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17 end
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18
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19 parsers.after = xs_string;
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20 parsers.before = function(st)
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21 local text = st:get_text();
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22 return text == "" or text;
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23 end;
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24 parsers.max = xs_int;
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25 parsers.index = xs_int;
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26
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27 parsers.first = function(st)
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28 return { index = tonumber(st.attr.index); st:get_text() };
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29 end;
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30 parsers.last = xs_string;
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31 parsers.count = xs_int;
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32 end
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33
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34 local element_generators = setmetatable({
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35 first = function(st, data)
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36 if type(data) == "table" then
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37 st:tag("first", { index = data.index }):text(data[1]):up();
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38 else
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39 st:tag("first"):text(tostring(data)):up();
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40 end
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41 end;
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42 before = function(st, data)
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43 if data == true then
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44 st:tag("before"):up();
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45 else
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46 st:tag("before"):text(tostring(data)):up();
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47 end
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48 end
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49 }, {
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50 __index = function(_, name)
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51 return function(st, data)
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52 st:tag(name):text(tostring(data)):up();
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53 end
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54 end;
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55 });
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56
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57
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58 local function parse(set)
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59 local rs = {};
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60 for tag in set:childtags() do
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61 local name = tag.name;
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62 local parser = name and element_parsers[name];
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63 if parser then
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64 rs[name] = parser(tag);
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65 end
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66 end
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67 return rs;
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68 end
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69
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70 local function generate(t)
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71 local st = stanza("set", { xmlns = xmlns_rsm });
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72 for k,v in pairs(t) do
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73 if element_parsers[k] then
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74 element_generators[k](st, v);
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75 end
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76 end
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77 return st;
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78 end
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79
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80 local function get(st)
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81 local set = st:get_child("set", xmlns_rsm);
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82 if set and #set.tags > 0 then
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83 return parse(set);
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84 end
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85 end
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86
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87 return { parse = parse, generate = generate, get = get };