prosody
23bb280c5eac
tools/erlparse.lua

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tools/erlparse.lua @ 1670:23bb280c5eac

Remove unwanted spaces.
author Tobias Markmann <tm@ayena.de>
date Wed, 12 Aug 2009 20:09:07 +0200
parent 1572:1b87dfb76caa
child 1783:f79972ad8965
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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841d61be198f Remove version number from copyright headers
Matthew Wild <mwild1@gmail.com>
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diff changeset
1 -- Prosody IM
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90ce865eebd8 Update copyright notices for 2009
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2 -- Copyright (C) 2008-2009 Matthew Wild
90ce865eebd8 Update copyright notices for 2009
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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
b1885732e979 GPL->MIT!
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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 function readString()
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49 read("\""); -- skip quote
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50 local slash = nil;
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51 local str = "";
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52 while true do
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53 local ch = read();
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54 if ch == "\"" and not slash then break; end
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55 str = str..ch;
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56 end
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57 str = str:gsub("\\.", {["\\b"]="\b", ["\\d"]="\d", ["\\e"]="\e", ["\\f"]="\f", ["\\n"]="\n", ["\\r"]="\r", ["\\s"]="\s", ["\\t"]="\t", ["\\v"]="\v", ["\\\""]="\"", ["\\'"]="'", ["\\\\"]="\\"});
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58 return str;
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59 end
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60 local function readAtom1()
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61 local var = read();
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62 while isAtom(peek()) do
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63 var = var..read();
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64 end
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65 return var;
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66 end
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67 local function readAtom2()
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68 local str = read("'");
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69 local slash = nil;
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70 while true do
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71 local ch = read();
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72 str = str..ch;
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73 if ch == "'" and not slash then break; end
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74 end
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75 return str;
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76 end
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77 local function readNumber()
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78 local num = read();
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79 while isNumeric(peek()) do
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80 num = num..read();
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81 end
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82 return tonumber(num);
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83 end
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84 local readItem = nil;
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85 local function readTuple()
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86 local t = {};
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87 local s = ""; -- string representation
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88 read(); -- read {, or [, or <
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89 while true do
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90 local item = readItem();
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91 if not item then break; end
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92 if type(item) ~= type(0) or item > 255 then
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93 s = nil;
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94 elseif s then
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95 s = s..string.char(item);
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96 end
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97 table.insert(t, item);
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98 end
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99 read(); -- read }, or ], or >
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100 if s and s ~= "" then
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101 return s
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102 else
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103 return t
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104 end;
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105 end
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106 local function readBinary()
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107 read("<"); -- read <
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108 local t = readTuple();
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109 read(">") -- read >
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110 local ch = peek();
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111 if type(t) == type("") then
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112 -- binary is a list of integers
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113 return t;
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114 elseif type(t) == type({}) then
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115 if t[1] then
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116 -- binary contains string
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117 return t[1];
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118 else
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119 -- binary is empty
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120 return "";
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121 end;
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122 else
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123 error();
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124 end
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125 end
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126 readItem = function()
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127 local ch = peek();
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128 if ch == nil then return nil end
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129 if ch == "{" or ch == "[" then
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130 return readTuple();
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131 elseif isLowerAlpha(ch) then
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132 return readAtom1();
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133 elseif ch == "'" then
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134 return readAtom2();
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135 elseif isNumeric(ch) then
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136 return readNumber();
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137 elseif ch == "\"" then
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138 return readString();
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139 elseif ch == "<" then
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140 return readBinary();
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141 elseif isSpace(ch) or ch == "," or ch == "|" then
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142 read();
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143 return readItem();
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144 else
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145 --print("Unknown char: "..ch);
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146 return nil;
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147 end
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148 end
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149 local function readChunk()
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150 local x = readItem();
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151 if x then read("."); end
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152 return x;
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153 end
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154 local function readFile(filename)
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155 file = io.open(filename);
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156 if not file then error("File not found: "..filename); os.exit(0); end
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157 return function()
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158 local x = readChunk();
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159 if not x and peek() then error("Invalid char: "..peek()); end
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160 return x;
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161 end;
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162 end
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163
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164 module "erlparse"
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165
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166 function parseFile(file)
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167 return readFile(file);
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168 end
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169
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170 return _M;