/usr/lib/prosody/util/erlparse.lua is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | -- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local string_byte, string_char = string.byte, string.char;
local t_concat, t_insert = table.concat, table.insert;
local type, tonumber, tostring = type, tonumber, tostring;
local file = nil;
local last = nil;
local line = 1;
local function read(expected)
local ch;
if last then
ch = last; last = nil;
else
ch = file:read(1);
if ch == "\n" then line = line + 1; end
end
if expected and ch ~= expected then error("expected: "..expected.."; got: "..(ch or "nil").." on line "..line); end
return ch;
end
local function pushback(ch)
if last then error(); end
last = ch;
end
local function peek()
if not last then last = read(); end
return last;
end
local _A, _a, _Z, _z, _0, _9, __, _at, _space, _minus = string_byte("AaZz09@_ -", 1, 10);
local function isLowerAlpha(ch)
ch = string_byte(ch) or 0;
return (ch >= _a and ch <= _z);
end
local function isNumeric(ch)
ch = string_byte(ch) or 0;
return (ch >= _0 and ch <= _9) or ch == _minus;
end
local function isAtom(ch)
ch = string_byte(ch) or 0;
return (ch >= _A and ch <= _Z) or (ch >= _a and ch <= _z) or (ch >= _0 and ch <= _9) or ch == __ or ch == _at;
end
local function isSpace(ch)
ch = string_byte(ch) or "x";
return ch <= _space;
end
local escapes = {["\\b"]="\b", ["\\d"]="\127", ["\\e"]="\27", ["\\f"]="\f", ["\\n"]="\n", ["\\r"]="\r", ["\\s"]=" ", ["\\t"]="\t", ["\\v"]="\v", ["\\\""]="\"", ["\\'"]="'", ["\\\\"]="\\"};
local function readString()
read("\""); -- skip quote
local slash = nil;
local str = {};
while true do
local ch = read();
if slash then
slash = slash..ch;
if not escapes[slash] then error("Unknown escape sequence: "..slash); end
str[#str+1] = escapes[slash];
slash = nil;
elseif ch == "\"" then
break;
elseif ch == "\\" then
slash = ch;
else
str[#str+1] = ch;
end
end
return t_concat(str);
end
local function readAtom1()
local var = { read() };
while isAtom(peek()) do
var[#var+1] = read();
end
return t_concat(var);
end
local function readAtom2()
local str = { read("'") };
local slash = nil;
while true do
local ch = read();
str[#str+1] = ch;
if ch == "'" and not slash then break; end
end
return t_concat(str);
end
local function readNumber()
local num = { read() };
while isNumeric(peek()) do
num[#num+1] = read();
end
if peek() == "." then
num[#num+1] = read();
while isNumeric(peek()) do
num[#num+1] = read();
end
end
return tonumber(t_concat(num));
end
local readItem = nil;
local function readTuple()
local t = {};
local s = {}; -- string representation
read(); -- read {, or [, or <
while true do
local item = readItem();
if not item then break; end
if type(item) ~= "number" or item > 255 then
s = nil;
elseif s then
s[#s+1] = string_char(item);
end
t_insert(t, item);
end
read(); -- read }, or ], or >
if s and #s > 0 then
return t_concat(s)
else
return t
end;
end
local function readBinary()
read("<"); -- read <
-- Discard PIDs
if isNumeric(peek()) then
while peek() ~= ">" do read(); end
read(">");
return {};
end
local t = readTuple();
read(">") -- read >
local ch = peek();
if type(t) == "string" then
-- binary is a list of integers
return t;
elseif type(t) == "table" then
if t[1] then
-- binary contains string
return t[1];
else
-- binary is empty
return "";
end;
else
error();
end
end
readItem = function()
local ch = peek();
if ch == nil then return nil end
if ch == "{" or ch == "[" then
return readTuple();
elseif isLowerAlpha(ch) then
return readAtom1();
elseif ch == "'" then
return readAtom2();
elseif isNumeric(ch) then
return readNumber();
elseif ch == "\"" then
return readString();
elseif ch == "<" then
return readBinary();
elseif isSpace(ch) or ch == "," or ch == "|" then
read();
return readItem();
else
--print("Unknown char: "..ch);
return nil;
end
end
local function readChunk()
local x = readItem();
if x then read("."); end
return x;
end
local function readFile(filename)
file = io.open(filename);
if not file then error("File not found: "..filename); os.exit(0); end
return function()
local x = readChunk();
if not x and peek() then error("Invalid char: "..peek()); end
return x;
end;
end
module "erlparse"
function parseFile(file)
return readFile(file);
end
return _M;
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