prosody
e4c5d0d21ac7
tools/erlparse.lua

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tools/erlparse.lua @ 2258:e4c5d0d21ac7

util.sasl.digest-md5: Fixing some variable access.
author Tobias Markmann <tm@ayena.de>
date Sat, 28 Nov 2009 18:58:58 +0100
parent 1783:f79972ad8965
child 2923:b7049746bd29
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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90ce865eebd8 Update copyright notices for 2009
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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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cccd610a0ef9 Insert copyright/license headers
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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
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10
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11 local file = nil;
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12 local last = nil;
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13 local function read(expected)
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14 local ch;
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15 if last then
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16 ch = last; last = nil;
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17 else ch = file:read(1); end
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18 if expected and ch ~= expected then error("expected: "..expected.."; got: "..(ch or "nil")); end
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19 return ch;
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20 end
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21 local function pushback(ch)
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22 if last then error(); end
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23 last = ch;
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24 end
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25 local function peek()
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26 if not last then last = read(); end
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27 return last;
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28 end
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29
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30 local _A, _a, _Z, _z, _0, _9, __, _at, _space = string.byte("AaZz09@_ ", 1, 9);
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31 local function isLowerAlpha(ch)
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32 ch = string.byte(ch) or 0;
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33 return (ch >= _a and ch <= _z);
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34 end
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35 local function isNumeric(ch)
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36 ch = string.byte(ch) or 0;
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37 return (ch >= _0 and ch <= _9);
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38 end
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39 local function isAtom(ch)
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40 ch = string.byte(ch) or 0;
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41 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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42 end
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43 local function isSpace(ch)
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44 ch = string.byte(ch) or "x";
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45 return ch <= _space;
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46 end
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47
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48 local escapes = {["\\b"]="\b", ["\\d"]="\d", ["\\e"]="\e", ["\\f"]="\f", ["\\n"]="\n", ["\\r"]="\r", ["\\s"]="\s", ["\\t"]="\t", ["\\v"]="\v", ["\\\""]="\"", ["\\'"]="'", ["\\\\"]="\\"};
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49 local function readString()
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50 read("\""); -- skip quote
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51 local slash = nil;
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52 local str = "";
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53 while true do
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54 local ch = read();
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55 if slash then
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56 slash = slash..ch;
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57 if not escapes[slash] then error("Unknown escape sequence: "..slash); end
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58 str = str..escapes[slash];
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59 slash = nil;
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60 elseif ch == "\"" then
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61 break;
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62 elseif ch == "\\" then
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63 slash = ch;
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64 else
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65 str = str..ch;
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66 end
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67 end
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68 return str;
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69 end
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70 local function readAtom1()
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71 local var = read();
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72 while isAtom(peek()) do
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73 var = var..read();
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74 end
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75 return var;
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76 end
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77 local function readAtom2()
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78 local str = read("'");
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79 local slash = nil;
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80 while true do
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81 local ch = read();
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82 str = str..ch;
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83 if ch == "'" and not slash then break; end
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84 end
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85 return str;
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86 end
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87 local function readNumber()
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88 local num = read();
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89 while isNumeric(peek()) do
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90 num = num..read();
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91 end
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92 return tonumber(num);
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93 end
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94 local readItem = nil;
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95 local function readTuple()
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96 local t = {};
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97 local s = ""; -- string representation
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98 read(); -- read {, or [, or <
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99 while true do
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100 local item = readItem();
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101 if not item then break; end
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102 if type(item) ~= type(0) or item > 255 then
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103 s = nil;
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104 elseif s then
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105 s = s..string.char(item);
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106 end
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107 table.insert(t, item);
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108 end
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109 read(); -- read }, or ], or >
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110 if s and s ~= "" then
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111 return s
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112 else
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113 return t
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114 end;
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115 end
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116 local function readBinary()
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117 read("<"); -- read <
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118 local t = readTuple();
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119 read(">") -- read >
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120 local ch = peek();
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121 if type(t) == type("") then
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122 -- binary is a list of integers
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123 return t;
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124 elseif type(t) == type({}) then
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125 if t[1] then
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126 -- binary contains string
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127 return t[1];
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128 else
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129 -- binary is empty
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130 return "";
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131 end;
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132 else
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133 error();
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134 end
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135 end
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136 readItem = function()
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137 local ch = peek();
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138 if ch == nil then return nil end
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139 if ch == "{" or ch == "[" then
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140 return readTuple();
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141 elseif isLowerAlpha(ch) then
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142 return readAtom1();
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143 elseif ch == "'" then
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144 return readAtom2();
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145 elseif isNumeric(ch) then
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146 return readNumber();
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147 elseif ch == "\"" then
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148 return readString();
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149 elseif ch == "<" then
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150 return readBinary();
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151 elseif isSpace(ch) or ch == "," or ch == "|" then
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152 read();
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153 return readItem();
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154 else
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155 --print("Unknown char: "..ch);
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156 return nil;
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157 end
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158 end
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159 local function readChunk()
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160 local x = readItem();
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161 if x then read("."); end
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162 return x;
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163 end
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164 local function readFile(filename)
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165 file = io.open(filename);
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166 if not file then error("File not found: "..filename); os.exit(0); end
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167 return function()
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168 local x = readChunk();
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169 if not x and peek() then error("Invalid char: "..peek()); end
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170 return x;
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171 end;
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172 end
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173
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174 module "erlparse"
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175
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176 function parseFile(file)
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177 return readFile(file);
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178 end
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179
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180 return _M;