Thu, 25 Jun 2009 17:22:53 +0500
util.stanza: Rewrote stanza_mt.__tostring. 20-30% faster stanza serialization. - #optimization
894 | 1 | -- Prosody IM v0.4 |
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2 | -- Copyright (C) 2008-2009 Matthew Wild |
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3 | -- Copyright (C) 2008-2009 Waqas Hussain |
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4 | -- |
758 | 5 | -- This project is MIT/X11 licensed. Please see the |
6 | -- COPYING file in the source package for more information. | |
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7 | -- |
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8 | |
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9 | |
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10 | local t_insert = table.insert; |
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11 | local t_concat = table.concat; |
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12 | local t_remove = table.remove; |
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13 | local t_concat = table.concat; |
23 | 14 | local s_format = string.format; |
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15 | local s_match = string.match; |
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16 | local tostring = tostring; |
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17 | local setmetatable = setmetatable; |
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18 | local getmetatable = getmetatable; |
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19 | local pairs = pairs; |
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20 | local ipairs = ipairs; |
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21 | local type = type; |
145 | 22 | local next = next; |
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23 | local print = print; |
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24 | local unpack = unpack; |
4 | 25 | local s_gsub = string.gsub; |
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26 | local s_char = string.char; |
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27 | local os = os; |
145 | 28 | |
262 | 29 | local do_pretty_printing = not os.getenv("WINDIR"); |
30 | local getstyle, getstring = require "util.termcolours".getstyle, require "util.termcolours".getstring; | |
31 | ||
145 | 32 | local log = require "util.logger".init("stanza"); |
33 | ||
0 | 34 | module "stanza" |
35 | ||
36 | stanza_mt = {}; | |
37 | stanza_mt.__index = stanza_mt; | |
38 | ||
39 | function stanza(name, attr) | |
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40 | local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}}; |
0 | 41 | return setmetatable(stanza, stanza_mt); |
42 | end | |
43 | ||
44 | function stanza_mt:query(xmlns) | |
45 | return self:tag("query", { xmlns = xmlns }); | |
46 | end | |
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47 | |
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48 | function stanza_mt:body(text, attr) |
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49 | return self:tag("body", attr):text(text); |
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50 | end |
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51 | |
0 | 52 | function stanza_mt:tag(name, attrs) |
53 | local s = stanza(name, attrs); | |
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54 | (self.last_add[#self.last_add] or self):add_direct_child(s); |
0 | 55 | t_insert(self.last_add, s); |
56 | return self; | |
57 | end | |
58 | ||
59 | function stanza_mt:text(text) | |
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60 | (self.last_add[#self.last_add] or self):add_direct_child(text); |
0 | 61 | return self; |
62 | end | |
63 | ||
64 | function stanza_mt:up() | |
65 | t_remove(self.last_add); | |
66 | return self; | |
67 | end | |
68 | ||
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69 | function stanza_mt:reset() |
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70 | local last_add = self.last_add; |
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71 | for i = 1,#last_add do |
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72 | last_add[i] = nil; |
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73 | end |
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74 | return self; |
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75 | end |
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76 | |
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77 | function stanza_mt:add_direct_child(child) |
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78 | if type(child) == "table" then |
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79 | t_insert(self.tags, child); |
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80 | end |
0 | 81 | t_insert(self, child); |
82 | end | |
83 | ||
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84 | function stanza_mt:add_child(child) |
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85 | (self.last_add[#self.last_add] or self):add_direct_child(child); |
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86 | return self; |
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87 | end |
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88 | |
0 | 89 | function stanza_mt:child_with_name(name) |
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90 | for _, child in ipairs(self.tags) do |
0 | 91 | if child.name == name then return child; end |
92 | end | |
93 | end | |
94 | ||
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95 | function stanza_mt:child_with_ns(ns) |
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96 | for _, child in ipairs(self.tags) do |
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97 | if child.attr.xmlns == ns then return child; end |
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98 | end |
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99 | end |
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100 | |
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101 | function stanza_mt:children() |
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102 | local i = 0; |
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103 | return function (a) |
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104 | i = i + 1 |
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105 | local v = a[i] |
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106 | if v then return v; end |
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107 | end, self, i; |
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108 | |
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109 | end |
2 | 110 | function stanza_mt:childtags() |
111 | local i = 0; | |
112 | return function (a) | |
113 | i = i + 1 | |
114 | local v = self.tags[i] | |
115 | if v then return v; end | |
116 | end, self.tags[1], i; | |
117 | ||
118 | end | |
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119 | |
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120 | local xml_escape = (function() |
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121 | local escape_table = { ["'"] = "'", ["\""] = """, ["<"] = "<", [">"] = ">", ["&"] = "&" }; |
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122 | return function(str) return (s_gsub(str, "['&<>\"]", escape_table)); end |
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123 | end)(); |
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124 | local function _dostring(t, buf, self, xml_escape) |
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125 | local nsid, ns, attrk = 0; |
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126 | t_insert(buf, "<"..t.name); |
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127 | for k, v in pairs(t.attr) do |
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128 | ns, attrk = s_match(k, "^([^|]+)|(.+)$"); |
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129 | if ns then |
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130 | nsid = nsid + 1; |
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131 | t_insert(buf, " xmlns:ns"..nsid.."='"..xml_escape(ns).."' ".."ns"..nsid..":"..attrk.."='"..xml_escape(v).."'"); |
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132 | else |
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133 | t_insert(buf, " "..k.."='"..xml_escape(v).."'"); |
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134 | end |
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135 | end |
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136 | t_insert(buf, ">"); |
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137 | for n=1,#t do |
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138 | local child = t[n]; |
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139 | if child.name then |
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140 | self(child, buf, self, xml_escape); |
4 | 141 | else |
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142 | t_insert(buf, xml_escape(child)); |
4 | 143 | end |
0 | 144 | end |
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145 | t_insert(buf, "</"..t.name..">"); |
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146 | end |
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147 | function stanza_mt.__tostring(t) |
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148 | local buf = {}; |
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149 | _dostring(t, buf, _dostring, xml_escape); |
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150 | return t_concat(buf); |
0 | 151 | end |
152 | ||
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153 | function stanza_mt.top_tag(t) |
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154 | local attr_string = ""; |
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155 | if t.attr then |
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156 | for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(" %s='%s'", k, xml_escape(tostring(v))); end end |
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157 | end |
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158 | return s_format("<%s%s>", t.name, attr_string); |
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159 | end |
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160 | |
0 | 161 | function stanza_mt.__add(s1, s2) |
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162 | return s1:add_direct_child(s2); |
0 | 163 | end |
164 | ||
165 | ||
166 | do | |
167 | local id = 0; | |
168 | function new_id() | |
169 | id = id + 1; | |
170 | return "lx"..id; | |
171 | end | |
172 | end | |
173 | ||
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174 | function preserialize(stanza) |
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175 | local s = { name = stanza.name, attr = stanza.attr }; |
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176 | for _, child in ipairs(stanza) do |
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177 | if type(child) == "table" then |
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178 | t_insert(s, preserialize(child)); |
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179 | else |
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180 | t_insert(s, child); |
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181 | end |
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182 | end |
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183 | return s; |
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184 | end |
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185 | |
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186 | function deserialize(stanza) |
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187 | -- Set metatable |
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188 | if stanza then |
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189 | local attr = stanza.attr; |
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190 | for i=1,#attr do attr[i] = nil; end |
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191 | setmetatable(stanza, stanza_mt); |
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192 | for _, child in ipairs(stanza) do |
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193 | if type(child) == "table" then |
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194 | deserialize(child); |
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195 | end |
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196 | end |
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197 | if not stanza.tags then |
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198 | -- Rebuild tags |
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199 | local tags = {}; |
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200 | for _, child in ipairs(stanza) do |
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201 | if type(child) == "table" then |
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202 | t_insert(tags, child); |
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203 | end |
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204 | end |
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205 | stanza.tags = tags; |
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206 | if not stanza.last_add then |
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207 | stanza.last_add = {}; |
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208 | end |
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209 | end |
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210 | end |
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211 | |
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212 | return stanza; |
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213 | end |
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214 | |
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215 | function clone(stanza) |
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216 | local lookup_table = {}; |
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217 | local function _copy(object) |
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218 | if type(object) ~= "table" then |
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219 | return object; |
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220 | elseif lookup_table[object] then |
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221 | return lookup_table[object]; |
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222 | end |
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223 | local new_table = {}; |
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224 | lookup_table[object] = new_table; |
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225 | for index, value in pairs(object) do |
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226 | new_table[_copy(index)] = _copy(value); |
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227 | end |
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228 | return setmetatable(new_table, getmetatable(object)); |
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229 | end |
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230 | return _copy(stanza) |
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231 | end |
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232 | |
0 | 233 | function message(attr, body) |
234 | if not body then | |
235 | return stanza("message", attr); | |
236 | else | |
237 | return stanza("message", attr):tag("body"):text(body); | |
238 | end | |
239 | end | |
240 | function iq(attr) | |
241 | if attr and not attr.id then attr.id = new_id(); end | |
242 | return stanza("iq", attr or { id = new_id() }); | |
243 | end | |
244 | ||
245 | function reply(orig) | |
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246 | 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) }); |
0 | 247 | end |
248 | ||
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249 | function error_reply(orig, type, condition, message) |
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250 | local t = reply(orig); |
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251 | t.attr.type = "error"; |
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252 | t:tag("error", {type = type}) |
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253 | :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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254 | if (message) then t:tag("text"):text(message):up(); end |
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255 | return t; -- stanza ready for adding app-specific errors |
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256 | end |
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257 | |
0 | 258 | function presence(attr) |
259 | return stanza("presence", attr); | |
260 | end | |
261 | ||
262 | 262 | if do_pretty_printing then |
263 | local style_attrk = getstyle("yellow"); | |
264 | local style_attrv = getstyle("red"); | |
265 | local style_tagname = getstyle("red"); | |
266 | local style_punc = getstyle("magenta"); | |
267 | ||
268 | local attr_format = " "..getstring(style_attrk, "%s")..getstring(style_punc, "=")..getstring(style_attrv, "'%s'"); | |
269 | local top_tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">"); | |
270 | --local tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">").."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">"); | |
271 | local tag_format = top_tag_format.."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">"); | |
272 | function stanza_mt.pretty_print(t) | |
273 | local children_text = ""; | |
274 | for n, child in ipairs(t) do | |
275 | if type(child) == "string" then | |
276 | children_text = children_text .. xml_escape(child); | |
277 | else | |
278 | children_text = children_text .. child:pretty_print(); | |
279 | end | |
280 | end | |
281 | ||
282 | local attr_string = ""; | |
283 | if t.attr then | |
284 | for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end | |
285 | end | |
286 | return s_format(tag_format, t.name, attr_string, children_text, t.name); | |
287 | end | |
288 | ||
289 | function stanza_mt.pretty_top_tag(t) | |
290 | local attr_string = ""; | |
291 | if t.attr then | |
292 | for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end | |
293 | end | |
294 | return s_format(top_tag_format, t.name, attr_string); | |
295 | end | |
296 | else | |
297 | -- Sorry, fresh out of colours for you guys ;) | |
298 | stanza_mt.pretty_print = stanza_mt.__tostring; | |
299 | stanza_mt.pretty_top_tag = stanza_mt.top_tag; | |
300 | end | |
301 | ||
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302 | return _M; |