prosody
236375777f8c
util/stanza.lua

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util/stanza.lua @ 23:236375777f8c

Some docs written by Thorns. Need reviewing.
author bt@silverblade
date Wed, 17 Sep 2008 22:20:08 +0300
parent 6:7ad47ce20394
child 30:bcf539295f2d
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rev   line source
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1 local t_insert = table.insert;
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2 local t_remove = table.remove;
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3 local s_format = string.format;
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4 local tostring = tostring;
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5 local setmetatable = setmetatable;
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6 local pairs = pairs;
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7 local ipairs = ipairs;
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8 local type = type;
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9 local s_gsub = string.gsub;
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10 module "stanza"
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11
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12 stanza_mt = {};
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13 stanza_mt.__index = stanza_mt;
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14
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15 function stanza(name, attr)
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16 local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}};
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17 return setmetatable(stanza, stanza_mt);
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18 end
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19
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20 function stanza_mt:iq(attrs)
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21 return self + stanza("iq", attrs)
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22 end
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23 function stanza_mt:message(attrs)
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24 return self + stanza("message", attrs)
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25 end
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26 function stanza_mt:presence(attrs)
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27 return self + stanza("presence", attrs)
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28 end
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29 function stanza_mt:query(xmlns)
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30 return self:tag("query", { xmlns = xmlns });
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31 end
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32 function stanza_mt:tag(name, attrs)
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33 local s = stanza(name, attrs);
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34 (self.last_add[#self.last_add] or self):add_child(s);
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35 t_insert(self.last_add, s);
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36 return self;
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37 end
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38
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39 function stanza_mt:text(text)
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40 (self.last_add[#self.last_add] or self):add_child(text);
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41 return self;
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42 end
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43
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44 function stanza_mt:up()
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45 t_remove(self.last_add);
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46 return self;
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47 end
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48
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49 function stanza_mt:add_child(child)
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50 if type(child) == "table" then
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51 t_insert(self.tags, child);
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52 end
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53 t_insert(self, child);
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54 end
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55
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56 function stanza_mt:child_with_name(name)
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57 for _, child in ipairs(self) do
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58 if child.name == name then return child; end
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59 end
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60 end
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61
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62 function stanza_mt:children()
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63 local i = 0;
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64 return function (a)
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65 i = i + 1
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66 local v = a[i]
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67 if v then return v; end
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68 end, self, i;
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69
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70 end
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71 function stanza_mt:childtags()
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72 local i = 0;
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73 return function (a)
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74 i = i + 1
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75 local v = self.tags[i]
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76 if v then return v; end
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77 end, self.tags[1], i;
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78
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79 end
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80
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81 do
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82 local xml_entities = { ["'"] = "&apos;", ["\""] = "&quot;", ["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;" };
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83 function xml_escape(s) return s_gsub(s, "['&<>\"]", xml_entities); end
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84 end
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85
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86 local xml_escape = xml_escape;
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87
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88 function stanza_mt.__tostring(t)
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89 local children_text = "";
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90 for n, child in ipairs(t) do
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91 if type(child) == "string" then
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92 children_text = children_text .. xml_escape(child);
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93 else
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94 children_text = children_text .. tostring(child);
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95 end
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96 end
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97
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98 local attr_string = "";
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99 if t.attr then
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100 for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(" %s='%s'", k, tostring(v)); end end
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101 end
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102
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103 return s_format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
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104 end
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105
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106 function stanza_mt.__add(s1, s2)
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107 return s1:add_child(s2);
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108 end
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109
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110
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111 do
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112 local id = 0;
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113 function new_id()
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114 id = id + 1;
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115 return "lx"..id;
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116 end
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117 end
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118
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119 function message(attr, body)
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120 if not body then
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121 return stanza("message", attr);
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122 else
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123 return stanza("message", attr):tag("body"):text(body);
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124 end
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125 end
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126 function iq(attr)
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127 if attr and not attr.id then attr.id = new_id(); end
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128 return stanza("iq", attr or { id = new_id() });
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129 end
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130
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131 function reply(orig)
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132 return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or nil) });
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133 end
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134
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135 function presence(attr)
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136 return stanza("presence", attr);
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137 end
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138