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 = { ["'"] = "'", ["\""] = """, ["<"] = "<", [">"] = ">", ["&"] = "&" }; |
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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 |
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