prosody
e69fafc14491
tools/erlparse.lua

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tools/erlparse.lua @ 1202:e69fafc14491

net.dns: Add support for cancelling a coroutine-based request
author Matthew Wild <mwild1@gmail.com>
date Tue, 26 May 2009 21:47:25 +0100
parent 896:2c0b9e3c11c3
child 1523:841d61be198f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
896
2c0b9e3c11c3 0.3->0.4
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1 -- Prosody IM v0.4
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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, __, _space = string.byte("AaZz09_ ", 1, 8);
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31 local function isAlpha(ch)
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32 ch = string.byte(ch) or 0;
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33 return (ch >= _A and ch <= _Z) or (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 isVar(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 == __;
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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 readSpecialString()
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61 read("<"); read("<"); -- read <<
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62 local str = "";
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63 if peek() == "\"" then
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64 str = readString();
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65 elseif peek() ~= ">" then
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66 error();
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67 end
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68 read(">"); read(">"); -- read >>
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69 return str;
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70 end
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71 local function readVar()
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72 local var = read();
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73 while isVar(peek()) do
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74 var = var..read();
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75 end
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76 return var;
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77 end
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78 local function readNumber()
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79 local num = read();
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80 while isNumeric(peek()) do
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81 num = num..read();
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82 end
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83 return tonumber(num);
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84 end
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85 local readItem = nil;
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86 local function readTuple()
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87 local t = {};
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88 read(); -- read { 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 table.insert(t, item);
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93 end
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94 read(); -- read } or ]
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95 return t;
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96 end
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97 readItem = function()
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98 local ch = peek();
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99 if ch == nil then return nil end
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100 if ch == "{" or ch == "[" then
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101 return readTuple();
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102 elseif isAlpha(ch) then
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103 return readVar();
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104 elseif isNumeric(ch) then
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105 return readNumber();
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106 elseif ch == "\"" then
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107 return readString();
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108 elseif ch == "<" then
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109 return readSpecialString();
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110 elseif isSpace(ch) or ch == "," or ch == "|" then
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111 read();
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112 return readItem();
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113 else
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114 --print("Unknown char: "..ch);
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115 return nil;
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116 end
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117 end
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118 local function readChunk()
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119 local x = readItem();
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120 if x then read("."); end
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121 return x;
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122 end
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123 local function readFile(filename)
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124 file = io.open(filename);
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125 if not file then error("File not found: "..filename); os.exit(0); end
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126 return function()
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127 local x = readChunk();
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128 if not x and peek() then error("Invalid char: "..peek()); end
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129 return x;
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130 end;
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131 end
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132
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133 module "erlparse"
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134
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135 function parseFile(file)
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136 return readFile(file);
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137 end
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138
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139 return _M;