prosody
3dbdcc79bd66
fallbacks/lxp.lua

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fallbacks/lxp.lua @ 3681:3dbdcc79bd66

fallbacks/lxp.lua: CRLF -> LF.
author Waqas Hussain <waqas20@gmail.com>
date Thu, 02 Dec 2010 17:15:26 +0500
parent 3680:408a19977125
child 3899:eff0c5fe9119
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3681
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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1
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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2 local coroutine = coroutine;
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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3 local tonumber = tonumber;
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4 local string = string;
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5 local setmetatable, getmetatable = setmetatable, getmetatable;
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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6 local pairs = pairs;
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7
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8 local deadroutine = coroutine.create(function() end);
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9 coroutine.resume(deadroutine);
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10
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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11 module("lxp")
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12
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13 local entity_map = setmetatable({
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14 ["amp"] = "&";
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15 ["gt"] = ">";
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16 ["lt"] = "<";
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17 ["apos"] = "'";
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18 ["quot"] = "\"";
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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19 }, {__index = function(_, s)
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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20 if s:sub(1,1) == "#" then
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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21 if s:sub(2,2) == "x" then
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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22 return string.char(tonumber(s:sub(3), 16));
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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23 else
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24 return string.char(tonumber(s:sub(2)));
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25 end
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26 end
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27 end
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28 });
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29 local function xml_unescape(str)
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30 return (str:gsub("&(.-);", entity_map));
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31 end
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32 local function parse_tag(s)
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33 local name,sattr=(s):gmatch("([^%s]+)(.*)")();
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34 local attr = {};
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35 for a,b in (sattr):gmatch("([^=%s]+)=['\"]([^'\"]*)['\"]") do attr[a] = xml_unescape(b); end
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36 return name, attr;
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37 end
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38
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39 local function parser(data, handlers, ns_separator)
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40 local function read_until(str)
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41 local pos = data:find(str, nil, true);
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42 while not pos do
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43 data = data..coroutine.yield();
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44 pos = data:find(str, nil, true);
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45 end
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46 local r = data:sub(1, pos);
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47 data = data:sub(pos+1);
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48 return r;
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49 end
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50 local function read_before(str)
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51 local pos = data:find(str, nil, true);
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52 while not pos do
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53 data = data..coroutine.yield();
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54 pos = data:find(str, nil, true);
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55 end
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56 local r = data:sub(1, pos-1);
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57 data = data:sub(pos);
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
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58 return r;
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59 end
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60 local function peek()
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61 while #data == 0 do data = coroutine.yield(); end
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62 return data:sub(1,1);
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63 end
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64
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65 local ns = { xml = "http://www.w3.org/XML/1998/namespace" };
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66 ns.__index = ns;
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67 local function apply_ns(name, dodefault)
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68 local prefix,n = name:match("^([^:]*):(.*)$");
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69 if prefix and ns[prefix] then
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70 return ns[prefix]..ns_separator..n;
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71 end
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72 if dodefault and ns[""] then
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73 return ns[""]..ns_separator..name;
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74 end
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75 return name;
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76 end
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77 local function push(tag, attr)
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78 ns = setmetatable({}, ns);
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79 for k,v in pairs(attr) do
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80 local xmlns = k == "xmlns" and "" or k:match("^xmlns:(.*)$");
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81 if xmlns then
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82 ns[xmlns] = v;
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83 attr[k] = nil;
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84 end
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85 end
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86 local newattr, n = {}, 0;
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87 for k,v in pairs(attr) do
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88 n = n+1;
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89 k = apply_ns(k);
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90 newattr[n] = k;
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91 newattr[k] = v;
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92 end
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93 tag = apply_ns(tag, true);
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94 ns[0] = tag;
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95 ns.__index = ns;
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96 return tag, newattr;
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97 end
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98 local function pop()
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99 local tag = ns[0];
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100 ns = getmetatable(ns);
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101 return tag;
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102 end
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103
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104 while true do
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105 if peek() == "<" then
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106 local elem = read_until(">"):sub(2,-2);
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107 if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
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108 elseif elem:sub(1,1) == "/" then -- end tag
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109 elem = elem:sub(2);
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110 local name = pop();
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111 handlers:EndElement(name); -- TODO check for start-end tag name match
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112 elseif elem:sub(-1,-1) == "/" then -- empty tag
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113 elem = elem:sub(1,-2);
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114 local name,attr = parse_tag(elem);
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115 name,attr = push(name,attr);
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116 handlers:StartElement(name,attr);
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117 name = pop();
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118 handlers:EndElement(name);
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119 else -- start tag
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120 local name,attr = parse_tag(elem);
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121 name,attr = push(name,attr);
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122 handlers:StartElement(name,attr);
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123 end
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124 else
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125 local text = read_before("<");
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126 handlers:CharacterData(xml_unescape(text));
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127 end
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128 end
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129 end
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130
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131 function new(handlers, ns_separator)
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132 local co = coroutine.create(parser);
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
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133 return {
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
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134 parse = function(self, data)
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
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135 if not data then
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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136 co = deadroutine;
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
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137 return true; -- eof
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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138 end
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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139 local success, result = coroutine.resume(co, data, handlers, ns_separator);
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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140 if result then
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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141 co = deadroutine;
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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142 return nil, result; -- error
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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143 end
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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144 return true; -- success
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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145 end;
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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146 };
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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147 end
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
parents: 3680
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148
3dbdcc79bd66 fallbacks/lxp.lua: CRLF -> LF.
Waqas Hussain <waqas20@gmail.com>
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149 return _M;