Thu, 23 Oct 2008 02:11:48 +0500
Updated session documentation
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1 | local t_insert = table.insert; |
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2 | local t_remove = table.remove; |
23 | 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 unpack = unpack; |
4 | 10 | local s_gsub = string.gsub; |
0 | 11 | module "stanza" |
12 | ||
13 | stanza_mt = {}; | |
14 | stanza_mt.__index = stanza_mt; | |
15 | ||
16 | function stanza(name, attr) | |
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17 | local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}}; |
0 | 18 | return setmetatable(stanza, stanza_mt); |
19 | end | |
20 | ||
21 | function stanza_mt:query(xmlns) | |
22 | return self:tag("query", { xmlns = xmlns }); | |
23 | end | |
24 | function stanza_mt:tag(name, attrs) | |
25 | local s = stanza(name, attrs); | |
26 | (self.last_add[#self.last_add] or self):add_child(s); | |
27 | t_insert(self.last_add, s); | |
28 | return self; | |
29 | end | |
30 | ||
31 | function stanza_mt:text(text) | |
32 | (self.last_add[#self.last_add] or self):add_child(text); | |
33 | return self; | |
34 | end | |
35 | ||
36 | function stanza_mt:up() | |
37 | t_remove(self.last_add); | |
38 | return self; | |
39 | end | |
40 | ||
41 | function stanza_mt:add_child(child) | |
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42 | if type(child) == "table" then |
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43 | t_insert(self.tags, child); |
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44 | end |
0 | 45 | t_insert(self, child); |
46 | end | |
47 | ||
48 | function stanza_mt:child_with_name(name) | |
49 | for _, child in ipairs(self) do | |
50 | if child.name == name then return child; end | |
51 | end | |
52 | end | |
53 | ||
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54 | function stanza_mt:children() |
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55 | local i = 0; |
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56 | return function (a) |
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57 | i = i + 1 |
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58 | local v = a[i] |
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59 | if v then return v; end |
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60 | end, self, i; |
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61 | |
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62 | end |
2 | 63 | function stanza_mt:childtags() |
64 | local i = 0; | |
65 | return function (a) | |
66 | i = i + 1 | |
67 | local v = self.tags[i] | |
68 | if v then return v; end | |
69 | end, self.tags[1], i; | |
70 | ||
71 | end | |
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72 | |
4 | 73 | do |
74 | local xml_entities = { ["'"] = "'", ["\""] = """, ["<"] = "<", [">"] = ">", ["&"] = "&" }; | |
75 | function xml_escape(s) return s_gsub(s, "['&<>\"]", xml_entities); end | |
76 | end | |
77 | ||
78 | local xml_escape = xml_escape; | |
79 | ||
0 | 80 | function stanza_mt.__tostring(t) |
81 | local children_text = ""; | |
82 | for n, child in ipairs(t) do | |
4 | 83 | if type(child) == "string" then |
84 | children_text = children_text .. xml_escape(child); | |
85 | else | |
86 | children_text = children_text .. tostring(child); | |
87 | end | |
0 | 88 | end |
89 | ||
90 | local attr_string = ""; | |
91 | if t.attr then | |
23 | 92 | 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 |
0 | 93 | end |
94 | ||
23 | 95 | return s_format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name); |
0 | 96 | end |
97 | ||
98 | function stanza_mt.__add(s1, s2) | |
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99 | return s1:add_child(s2); |
0 | 100 | end |
101 | ||
102 | ||
103 | do | |
104 | local id = 0; | |
105 | function new_id() | |
106 | id = id + 1; | |
107 | return "lx"..id; | |
108 | end | |
109 | end | |
110 | ||
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111 | function preserialize(stanza) |
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112 | local s = { name = stanza.name, attr = stanza.attr }; |
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113 | for _, child in ipairs(stanza) do |
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114 | if type(child) == "table" then |
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115 | t_insert(s, preserialize(child)); |
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116 | else |
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117 | t_insert(s, child); |
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118 | end |
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119 | end |
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120 | return s; |
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121 | end |
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122 | |
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123 | function deserialize(stanza) |
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124 | -- Set metatable |
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125 | if stanza then |
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126 | setmetatable(stanza, stanza_mt); |
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127 | for _, child in ipairs(stanza) do |
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128 | if type(child) == "table" then |
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129 | deserialize(child); |
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130 | end |
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131 | end |
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132 | if not stanza.tags then |
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133 | -- Rebuild tags |
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134 | local tags = {}; |
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135 | for _, child in ipairs(stanza) do |
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136 | if type(child) == "table" then |
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137 | t_insert(tags, child); |
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138 | end |
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139 | end |
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140 | stanza.tags = tags; |
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141 | end |
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142 | end |
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143 | |
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144 | return stanza; |
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145 | end |
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Matthew Wild <mwild1@gmail.com>
parents:
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146 | |
0 | 147 | function message(attr, body) |
148 | if not body then | |
149 | return stanza("message", attr); | |
150 | else | |
151 | return stanza("message", attr):tag("body"):text(body); | |
152 | end | |
153 | end | |
154 | function iq(attr) | |
155 | if attr and not attr.id then attr.id = new_id(); end | |
156 | return stanza("iq", attr or { id = new_id() }); | |
157 | end | |
158 | ||
159 | function reply(orig) | |
160 | 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) }); | |
161 | end | |
162 | ||
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163 | function error_reply(orig, type, condition, message, clone) |
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164 | local t = reply(orig); |
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165 | t.attr.type = "error"; |
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166 | -- TODO use clone |
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167 | t:tag("error", {type = type}) |
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168 | :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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169 | if (message) then t:tag("text"):text(message):up(); end |
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170 | return t; -- stanza ready for adding app-specific errors |
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171 | end |
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172 | |
0 | 173 | function presence(attr) |
174 | return stanza("presence", attr); | |
175 | end | |
176 | ||
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177 | return _M; |