prosody
d17392022cb2
tools/erlparse.lua

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tools/erlparse.lua @ 10805:d17392022cb2

mod_muc: let event handlers modify cloned presence Updates #1533
author JC Brand <jc@opkode.com>
date Wed, 22 Apr 2020 16:12:15 +0200
parent 7819:ad709ee7d3d8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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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 local string_byte, string_char = string.byte, string.char;
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10 local t_concat, t_insert = table.concat, table.insert;
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11 local type, tonumber, tostring = type, tonumber, tostring;
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12
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13 local file = nil;
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14 local last = nil;
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15 local line = 1;
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16 local function read(expected)
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17 local ch;
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18 if last then
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19 ch = last; last = nil;
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20 else
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21 ch = file:read(1);
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22 if ch == "\n" then line = line + 1; end
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23 end
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24 if expected and ch ~= expected then error("expected: "..expected.."; got: "..(ch or "nil").." on line "..line); end
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25 return ch;
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26 end
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27 local function pushback(ch)
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28 if last then error(); end
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29 last = ch;
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30 end
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31 local function peek()
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32 if not last then last = read(); end
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33 return last;
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34 end
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35
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36 local _A, _a, _Z, _z, _0, _9, __, _at, _space, _minus = string_byte("AaZz09@_ -", 1, 10);
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37 local function isLowerAlpha(ch)
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38 ch = string_byte(ch) or 0;
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39 return (ch >= _a and ch <= _z);
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40 end
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41 local function isNumeric(ch)
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42 ch = string_byte(ch) or 0;
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43 return (ch >= _0 and ch <= _9) or ch == _minus;
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44 end
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45 local function isAtom(ch)
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46 ch = string_byte(ch) or 0;
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47 return (ch >= _A and ch <= _Z) or (ch >= _a and ch <= _z) or (ch >= _0 and ch <= _9) or ch == __ or ch == _at;
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48 end
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49 local function isSpace(ch)
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50 ch = string_byte(ch) or "x";
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51 return ch <= _space;
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52 end
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53
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54 local escapes = {["\\b"]="\b", ["\\d"]="\127", ["\\e"]="\27", ["\\f"]="\f", ["\\n"]="\n", ["\\r"]="\r", ["\\s"]=" ", ["\\t"]="\t", ["\\v"]="\v", ["\\\""]="\"", ["\\'"]="'", ["\\\\"]="\\"};
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55 local function readString()
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56 read("\""); -- skip quote
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57 local slash = nil;
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58 local str = {};
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59 while true do
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60 local ch = read();
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61 if slash then
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62 slash = slash..ch;
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63 if not escapes[slash] then error("Unknown escape sequence: "..slash); end
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64 str[#str+1] = escapes[slash];
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65 slash = nil;
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66 elseif ch == "\"" then
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67 break;
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68 elseif ch == "\\" then
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69 slash = ch;
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70 else
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71 str[#str+1] = ch;
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72 end
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73 end
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74 return t_concat(str);
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75 end
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76 local function readAtom1()
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77 local var = { read() };
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78 while isAtom(peek()) do
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79 var[#var+1] = read();
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80 end
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81 return t_concat(var);
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82 end
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83 local function readAtom2()
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84 local str = { read("'") };
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85 local slash = nil;
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86 while true do
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87 local ch = read();
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88 str[#str+1] = ch;
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89 if ch == "'" and not slash then break; end
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90 end
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91 return t_concat(str);
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92 end
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93 local function readNumber()
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94 local num = { read() };
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95 while isNumeric(peek()) do
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96 num[#num+1] = read();
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97 end
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98 if peek() == "." then
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99 num[#num+1] = read();
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100 while isNumeric(peek()) do
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101 num[#num+1] = read();
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102 end
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103 end
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104 return tonumber(t_concat(num));
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105 end
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106 local readItem = nil;
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107 local function readTuple()
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108 local t = {};
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109 local s = {}; -- string representation
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110 read(); -- read {, or [, or <
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111 while true do
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112 local item = readItem();
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113 if not item then break; end
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114 if type(item) ~= "number" or item > 255 then
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115 s = nil;
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116 elseif s then
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117 s[#s+1] = string_char(item);
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118 end
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119 t_insert(t, item);
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120 end
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121 read(); -- read }, or ], or >
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122 if s and #s > 0 then
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123 return t_concat(s)
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124 else
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125 return t
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126 end;
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127 end
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128 local function readBinary()
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129 read("<"); -- read <
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130 -- Discard PIDs
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131 if isNumeric(peek()) then
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132 while peek() ~= ">" do read(); end
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133 read(">");
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134 return {};
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135 end
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136 local t = readTuple();
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137 read(">") -- read >
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138 local ch = peek();
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139 if type(t) == "string" then
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140 -- binary is a list of integers
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141 return t;
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142 elseif type(t) == "table" then
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143 if t[1] then
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144 -- binary contains string
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145 return t[1];
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146 else
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147 -- binary is empty
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148 return "";
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149 end;
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150 else
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151 error();
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152 end
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153 end
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154 readItem = function()
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155 local ch = peek();
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156 if ch == nil then return nil end
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157 if ch == "{" or ch == "[" then
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158 return readTuple();
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159 elseif isLowerAlpha(ch) then
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160 return readAtom1();
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161 elseif ch == "'" then
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162 return readAtom2();
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163 elseif isNumeric(ch) then
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164 return readNumber();
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165 elseif ch == "\"" then
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166 return readString();
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167 elseif ch == "<" then
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168 return readBinary();
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169 elseif isSpace(ch) or ch == "," or ch == "|" then
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170 read();
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171 return readItem();
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172 else
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173 --print("Unknown char: "..ch);
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174 return nil;
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175 end
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176 end
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177 local function readChunk()
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178 local x = readItem();
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179 if x then read("."); end
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180 return x;
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181 end
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182 local function readFile(filename)
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183 file = io.open(filename);
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184 if not file then error("File not found: "..filename); os.exit(0); end
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185 return function()
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186 local x = readChunk();
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187 if not x and peek() then error("Invalid char: "..peek()); end
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188 return x;
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189 end;
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190 end
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191
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192 local _M = {};
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193
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194 function _M.parseFile(file)
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195 return readFile(file);
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196 end
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197
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198 return _M;