Annotate

util/stanza.lua @ 251:5b6dec537914

Merge from waqas
author Matthew Wild <mwild1@gmail.com>
date Thu, 13 Nov 2008 16:58:29 +0000
parent 242:f15afbcbc55c
parent 246:0904fd197cbe
child 262:8c73fb2ff4a2
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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 next = next;
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10 local print = print;
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11 local unpack = unpack;
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12 local s_gsub = string.gsub;
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13
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14 local debug = debug;
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15 local log = require "util.logger".init("stanza");
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16
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17 module "stanza"
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18
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19 stanza_mt = {};
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20 stanza_mt.__index = stanza_mt;
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21
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22 function stanza(name, attr)
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23 local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}};
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24 return setmetatable(stanza, stanza_mt);
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25 end
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26
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27 function stanza_mt:query(xmlns)
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28 return self:tag("query", { xmlns = xmlns });
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29 end
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30 function stanza_mt:tag(name, attrs)
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31 local s = stanza(name, attrs);
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32 (self.last_add[#self.last_add] or self):add_direct_child(s);
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33 t_insert(self.last_add, s);
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34 return self;
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35 end
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36
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37 function stanza_mt:text(text)
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38 (self.last_add[#self.last_add] or self):add_direct_child(text);
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39 return self;
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40 end
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41
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42 function stanza_mt:up()
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43 t_remove(self.last_add);
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44 return self;
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45 end
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46
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47 function stanza_mt:add_direct_child(child)
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48 if type(child) == "table" then
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49 t_insert(self.tags, child);
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50 end
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51 t_insert(self, child);
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52 end
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53
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54 function stanza_mt:add_child(child)
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55 (self.last_add[#self.last_add] or self):add_direct_child(child);
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56 return self;
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57 end
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58
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59 function stanza_mt:child_with_name(name)
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60 for _, child in ipairs(self) do
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61 if child.name == name then return child; end
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62 end
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63 end
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64
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65 function stanza_mt:children()
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66 local i = 0;
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67 return function (a)
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68 i = i + 1
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69 local v = a[i]
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70 if v then return v; end
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71 end, self, i;
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72
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73 end
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74 function stanza_mt:childtags()
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75 local i = 0;
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76 return function (a)
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77 i = i + 1
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78 local v = self.tags[i]
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79 if v then return v; end
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80 end, self.tags[1], i;
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81
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82 end
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83
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84 do
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85 local xml_entities = { ["'"] = "&apos;", ["\""] = "&quot;", ["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;" };
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86 function xml_escape(s) return s_gsub(s, "['&<>\"]", xml_entities); end
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87 end
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88
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89 local xml_escape = xml_escape;
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90
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91 function stanza_mt.__tostring(t)
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92 local children_text = "";
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93 for n, child in ipairs(t) do
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94 if type(child) == "string" then
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95 children_text = children_text .. xml_escape(child);
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96 else
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97 children_text = children_text .. tostring(child);
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98 end
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99 end
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100
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101 local attr_string = "";
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102 if t.attr then
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103 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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104 end
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105 return s_format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
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106 end
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107
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108 function stanza_mt.top_tag(t)
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109 local attr_string = "";
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110 if t.attr then
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111 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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112 end
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113 return s_format("<%s%s>", t.name, attr_string);
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114 end
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115
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116 function stanza_mt.__add(s1, s2)
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117 return s1:add_direct_child(s2);
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118 end
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119
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120
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121 do
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122 local id = 0;
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123 function new_id()
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124 id = id + 1;
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125 return "lx"..id;
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126 end
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127 end
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128
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129 function preserialize(stanza)
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130 local s = { name = stanza.name, attr = stanza.attr };
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131 for _, child in ipairs(stanza) do
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132 if type(child) == "table" then
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133 t_insert(s, preserialize(child));
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134 else
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135 t_insert(s, child);
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136 end
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137 end
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138 return s;
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139 end
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140
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141 function deserialize(stanza)
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142 -- Set metatable
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143 if stanza then
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144 setmetatable(stanza, stanza_mt);
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145 for _, child in ipairs(stanza) do
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146 if type(child) == "table" then
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147 deserialize(child);
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148 end
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149 end
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150 if not stanza.tags then
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151 -- Rebuild tags
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152 local tags = {};
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153 for _, child in ipairs(stanza) do
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154 if type(child) == "table" then
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155 t_insert(tags, child);
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156 end
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157 end
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158 stanza.tags = tags;
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159 end
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160 if not stanza.last_add then
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161 stanza.last_add = {};
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162 end
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163 end
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164
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165 return stanza;
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166 end
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167
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168 function message(attr, body)
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169 if not body then
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170 return stanza("message", attr);
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171 else
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172 return stanza("message", attr):tag("body"):text(body);
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173 end
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174 end
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175 function iq(attr)
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176 if attr and not attr.id then attr.id = new_id(); end
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177 return stanza("iq", attr or { id = new_id() });
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178 end
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179
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180 function reply(orig)
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181 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 orig.attr.type) });
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182 end
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183
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184 function error_reply(orig, type, condition, message, clone)
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185 local t = reply(orig);
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186 t.attr.type = "error";
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187 -- TODO use clone
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188 t:tag("error", {type = type})
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189 :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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190 if (message) then t:tag("text"):text(message):up(); end
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191 return t; -- stanza ready for adding app-specific errors
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192 end
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193
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194 function presence(attr)
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195 return stanza("presence", attr);
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196 end
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197
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198 return _M;