vanilla-wow-addons – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | --[[ |
2 | Name: AceHook-2.0 |
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3 | Revision: $Rev: 10030 $ |
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4 | Author(s): cladhaire (cladhaire@gmail.com) |
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5 | ckknight (ckknight@gmail.com) |
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6 | Inspired By: AceHook 1.x by Turan (<email here>) |
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7 | Website: http://www.wowace.com/ |
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8 | Documentation: http://wiki.wowace.com/index.php/AceHook-2.0 |
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9 | SVN: http://svn.wowace.com/root/trunk/Ace2/AceHook-2.0 |
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10 | Description: Mixin to allow for safe hooking of functions, methods, and scripts. |
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11 | Dependencies: AceLibrary, AceOO-2.0 |
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12 | ]] |
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13 | |||
14 | local MAJOR_VERSION = "AceHook-2.0" |
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15 | local MINOR_VERSION = "$Revision: 10030 $" |
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16 | |||
17 | -- This ensures the code is only executed if the libary doesn't already exist, or is a newer version |
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18 | if not AceLibrary then error(MAJOR_VERSION .. " requires AceLibrary.") end |
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19 | if not AceLibrary:IsNewVersion(MAJOR_VERSION, MINOR_VERSION) then return end |
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20 | |||
21 | if not AceLibrary:HasInstance("AceOO-2.0") then error(MAJOR_VERSION .. " requires AceOO-2.0") end |
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22 | |||
23 | --[[--------------------------------------------------------------------------------- |
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24 | Create the library object |
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25 | ----------------------------------------------------------------------------------]] |
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26 | |||
27 | local AceOO = AceLibrary:GetInstance("AceOO-2.0") |
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28 | local AceHook = AceOO.Mixin { |
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29 | "Hook", |
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30 | "Unhook", |
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31 | "UnhookAll", |
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32 | "HookReport", |
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33 | "IsHooked", |
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34 | "HookScript", |
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35 | } |
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36 | |||
37 | --[[--------------------------------------------------------------------------------- |
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38 | Library Definitions |
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39 | ----------------------------------------------------------------------------------]] |
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40 | |||
41 | local protFuncs = { |
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42 | CameraOrSelectOrMoveStart = true, CameraOrSelectOrMoveStop = true, |
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43 | TurnOrActionStart = true, TurnOrActionStop = true, |
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44 | PitchUpStart = true, PitchUpStop = true, |
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45 | PitchDownStart = true, PitchDownStop = true, |
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46 | MoveBackwardStart = true, MoveBackwardStop = true, |
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47 | MoveForwardStart = true, MoveForwardStop = true, |
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48 | Jump = true, StrafeLeftStart = true, |
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49 | StrafeLeftStop = true, StrafeRightStart = true, |
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50 | StrafeRightStop = true, ToggleMouseMove = true, |
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51 | ToggleRun = true, TurnLeftStart = true, |
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52 | TurnLeftStop = true, TurnRightStart = true, |
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53 | TurnRightStop = true, |
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54 | } |
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55 | |||
56 | local _G = getfenv(0) |
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57 | |||
58 | local handlers, funcs, scripts, actives |
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59 | |||
60 | --[[--------------------------------------------------------------------------------- |
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61 | Private definitions (Not exposed) |
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62 | ----------------------------------------------------------------------------------]] |
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63 | |||
64 | --[[---------------------------------------------------------------------- |
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65 | _debug - Internal Method |
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66 | -------------------------------------------------------------------------]] |
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67 | local function print(text) |
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68 | DEFAULT_CHAT_FRAME:AddMessage(text) |
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69 | end |
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70 | |||
71 | local function _debug(self, msg) |
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72 | local name = self.hooks.name |
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73 | if name then |
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74 | print(string.format("[%s]: %s", name, msg)) |
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75 | else |
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76 | print(msg) |
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77 | end |
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78 | end |
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79 | |||
80 | local new, del |
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81 | do |
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82 | local list = setmetatable({}, {__mode = "k"}) |
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83 | function new() |
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84 | local t = next(list) |
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85 | if not t then |
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86 | return {} |
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87 | end |
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88 | list[t] = nil |
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89 | return t |
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90 | end |
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91 | |||
92 | function del(t) |
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93 | setmetatable(t, nil) |
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94 | table.setn(t, 0) |
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95 | for k in pairs(t) do |
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96 | t[k] = nil |
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97 | end |
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98 | list[t] = true |
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99 | end |
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100 | end |
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101 | |||
102 | local origMetatable = { |
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103 | __call = function(self, a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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104 | return self.orig(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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105 | end |
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106 | } |
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107 | |||
108 | --[[---------------------------------------------------------------------- |
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109 | AceHook:_getFunctionHook- internal method |
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110 | -------------------------------------------------------------------------]] |
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111 | |||
112 | local function _getFunctionHook(self, func, handler, orig) |
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113 | if type(handler) == "string" then |
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114 | -- The handler is a method, need to self it |
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115 | return function(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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116 | if actives[orig] then |
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117 | return self[handler](self, a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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118 | else |
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119 | return orig(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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120 | end |
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121 | end |
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122 | else |
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123 | -- The handler is a function, just call it |
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124 | return function(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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125 | if actives[orig] then |
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126 | return handler(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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127 | else |
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128 | return orig(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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129 | end |
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130 | end |
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131 | end |
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132 | end |
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133 | |||
134 | --[[---------------------------------------------------------------------- |
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135 | AceHook:_getMethodHook - Internal Method |
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136 | -------------------------------------------------------------------------]] |
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137 | local function _getMethodHook(self, object, method, handler, orig, script) |
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138 | if type(handler) == "string" then |
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139 | -- The handler is a method, need to self it |
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140 | if script then |
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141 | return function() |
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142 | if actives[orig] then |
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143 | return self[handler](self, object) |
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144 | else |
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145 | return orig() |
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146 | end |
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147 | end |
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148 | else |
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149 | return function(obj,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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150 | if actives[orig] then |
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151 | return self[handler](self, obj, a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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152 | else |
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153 | return orig(obj, a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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154 | end |
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155 | end |
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156 | end |
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157 | else |
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158 | -- The handler is a function, just call it |
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159 | if script then |
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160 | return function() |
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161 | if actives[orig] then |
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162 | return handler(object) |
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163 | else |
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164 | return orig() |
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165 | end |
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166 | end |
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167 | else |
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168 | return function(obj,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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169 | if actives[orig] then |
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170 | return handler(obj,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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171 | else |
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172 | return orig(obj, a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20) |
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173 | end |
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174 | end |
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175 | end |
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176 | end |
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177 | end |
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178 | |||
179 | --[[---------------------------------------------------------------------- |
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180 | AceHook:HookFunc - internal method. |
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181 | o You can only hook each function once from each source. |
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182 | o If there is an inactive hook for this func/handler pair, we reactivate it |
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183 | o If there is an inactive hook for another handler, we error out. |
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184 | o Looks for handler as a method of the calling class, error if not available |
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185 | o If handler is a function, it just uses it directly through the wrapper |
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186 | -------------------------------------------------------------------------]] |
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187 | local function _hookFunc(self, func, handler) |
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188 | local orig = _G[func] |
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189 | |||
190 | if not orig or type(orig) ~= "function" then |
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191 | _debug(self, string.format("Attempt to hook a non-existant function %q", func),3) |
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192 | return |
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193 | end |
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194 | |||
195 | if not handler then handler = func end |
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196 | |||
197 | if self.hooks[func] then |
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198 | local orig = self.hooks[func].orig |
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199 | -- We have an active hook from this source. Don't multi-hook |
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200 | if actives[orig] then |
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201 | _debug(self, string.format("%q already has an active hook from this source.", func)) |
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202 | return |
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203 | end |
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204 | -- The hook is inactive, so reactivate it |
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205 | if handlers[orig] == handler then |
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206 | actives[orig] = true |
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207 | return |
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208 | else |
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209 | AceHook:error("There is a stale hook for %q can't hook or reactivate.", func) |
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210 | end |
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211 | end |
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212 | |||
213 | if type(handler) == "string" then |
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214 | if type(self[handler]) ~= "function" then |
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215 | AceHook:error("Could not find the the handler %q when hooking function %q", handler, func) |
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216 | end |
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217 | elseif type(handler) ~= "function" then |
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218 | AceHook:error("Could not find the handler you supplied when hooking %q", func) |
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219 | end |
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220 | |||
221 | local t = setmetatable(new(), origMetatable) |
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222 | self.hooks[func] = t |
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223 | t.orig = orig |
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224 | |||
225 | actives[orig] = true |
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226 | handlers[orig] = handler |
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227 | local newFunc = _getFunctionHook(self, func, handler, orig) |
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228 | funcs[orig] = newFunc |
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229 | |||
230 | _G[func] = newFunc |
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231 | end |
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232 | |||
233 | --[[---------------------------------------------------------------------- |
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234 | AceHook:UnhookFunc - internal method |
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235 | o If you attempt to unhook a function that has never been hooked, or to unhook in a |
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236 | system that has never had a hook before, the system will error with a stack trace |
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237 | o If we own the global function, then put the original back in its place and remove |
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238 | all references to the Hooks[func] structure. |
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239 | o If we don't own the global function (we've been hooked) we deactivate the hook, |
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240 | forcing the handler to passthrough. |
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241 | -------------------------------------------------------------------------]] |
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242 | local function _unhookFunc(self, func) |
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243 | if not self.hooks[func] or not funcs[self.hooks[func].orig] then |
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244 | _debug(self, string.format("Tried to unhook %q which is not currently hooked.", func)) |
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245 | return |
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246 | end |
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247 | |||
248 | local orig = self.hooks[func].orig |
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249 | |||
250 | if actives[orig] then |
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251 | -- See if we own the global function |
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252 | if _G[func] == funcs[orig] then |
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253 | _G[func] = orig |
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254 | self.hooks[func] = del(self.hooks[func]) |
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255 | handlers[orig] = nil |
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256 | funcs[orig] = nil |
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257 | scripts[orig] = nil |
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258 | actives[orig] = nil |
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259 | -- Magically all-done |
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260 | else |
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261 | actives[orig] = nil |
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262 | end |
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263 | end |
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264 | end |
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265 | |||
266 | --[[---------------------------------------------------------------------- |
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267 | AceHook:HookMeth - Takes an optional fourth argument |
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268 | o script - Signifies whether this is a script hook or not |
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269 | -------------------------------------------------------------------------]] |
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270 | |||
271 | local function _hookMeth(self, obj, method, handler, script) |
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272 | if not handler then handler = method end |
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273 | if (not obj or type(obj) ~= "table") then |
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274 | AceHook:error("The object you supplied could not be found, or isn't a table.") |
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275 | end |
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276 | |||
277 | if self.hooks[obj] and self.hooks[obj][method] then |
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278 | local orig = self.hooks[obj][method].orig |
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279 | -- We have an active hook from this source. Don't multi-hook |
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280 | if actives[orig] then |
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281 | _debug(self, string.format("%q already has an active hook from this source.", method)) |
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282 | return |
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283 | end |
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284 | -- The hook is inactive, so reactivate it. |
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285 | if handlers[orig] == handler then |
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286 | actives[orig] = true |
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287 | return |
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288 | else |
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289 | AceHook:error("There is a stale hook for %q can't hook or reactivate.", method) |
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290 | end |
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291 | end |
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292 | -- We're clear to try the hook, let's make some checks first |
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293 | if type(handler) == "string" then |
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294 | if type(self[handler]) ~= "function" then |
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295 | AceHook:error("Could not find the handler %q you supplied when hooking method %q", handler, method) |
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296 | end |
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297 | elseif type(handler) ~= "function" then |
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298 | AceHook:error("Could not find the handler you supplied when hooking method %q", method) |
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299 | end |
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300 | -- Handler has been found, so now try to find the method we're trying to hook |
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301 | local orig |
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302 | -- Script |
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303 | if script then |
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304 | if not obj.GetScript then |
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305 | AceHook:error("The object you supplied does not have a GetScript method.") |
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306 | end |
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307 | if not obj:HasScript(method) then |
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308 | AceHook:error("The object you supplied doesn't allow the %q method.", method) |
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309 | end |
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310 | -- Sometimes there is not a original function for a script. |
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311 | orig = obj:GetScript(method) |
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312 | if not orig then |
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313 | orig = function() end |
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314 | end |
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315 | -- Method |
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316 | else |
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317 | orig = obj[method] |
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318 | end |
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319 | if not orig then |
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320 | AceHook:error("Could not find the method or script %q you are trying to hook.", method) |
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321 | end |
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322 | if not self.hooks[obj] then |
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323 | self.hooks[obj] = new() |
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324 | end |
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325 | local t = setmetatable(new(), origMetatable) |
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326 | self.hooks[obj][method] = t |
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327 | t.orig = orig |
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328 | |||
329 | actives[orig] = true |
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330 | handlers[orig] = handler |
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331 | scripts[orig] = script and true or nil |
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332 | local newFunc = _getMethodHook(self, obj, method, handler, orig, script) |
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333 | funcs[orig] = newFunc |
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334 | |||
335 | if script then |
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336 | obj:SetScript(method, newFunc) |
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337 | else |
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338 | obj[method] = newFunc |
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339 | end |
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340 | end |
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341 | |||
342 | --[[---------------------------------------------------------------------- |
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343 | AceHook:UnhookMeth - Internal method |
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344 | o If you attempt to unhook a method that has never been hooked, or to unhook in a |
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345 | system that has never had a hook before, the system will error with a stack trace |
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346 | o If we own the global method, then put the original back in its place and remove |
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347 | all references to the Hooks[obj][method] structure. |
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348 | o If we don't own the global method (we've been hooked) we deactivate the hook, |
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349 | forcing the handler to passthrough. |
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350 | -------------------------------------------------------------------------]] |
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351 | local function _unhookMeth(self, obj, method) |
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352 | if not self.hooks[obj] or not self.hooks[obj][method] or not funcs[self.hooks[obj][method].orig] then |
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353 | _debug(self, string.format("Attempt to unhook a method %q that is not currently hooked.", method)) |
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354 | return |
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355 | end |
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356 | |||
357 | local orig = self.hooks[obj][method].orig |
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358 | |||
359 | if actives[orig] then |
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360 | -- If this is a script |
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361 | if scripts[orig] then |
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362 | if obj:GetScript(method) == funcs[orig] then |
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363 | -- We own the script. Kill it. |
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364 | obj:SetScript(method, orig) |
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365 | self.hooks[obj][method] = del(self.hooks[obj][method]) |
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366 | handlers[orig] = nil |
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367 | funcs[orig] = nil |
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368 | scripts[orig] = nil |
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369 | actives[orig] = nil |
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370 | else |
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371 | actives[orig] = nil |
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372 | end |
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373 | else |
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374 | if obj[method] == funcs[orig] then |
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375 | -- We own the method. Kill it. |
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376 | obj[method] = orig |
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377 | self.hooks[obj][method] = del(self.hooks[obj][method]) |
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378 | handlers[orig] = nil |
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379 | funcs[orig] = nil |
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380 | scripts[orig] = nil |
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381 | actives[orig] = nil |
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382 | else |
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383 | actives[orig] = nil |
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384 | end |
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385 | end |
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386 | end |
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387 | if not next(self.hooks[obj]) then |
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388 | -- Spank the table |
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389 | self.hooks[obj] = del(self.hooks[obj]) |
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390 | end |
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391 | end |
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392 | |||
393 | function AceHook:OnInstanceInit(object) |
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394 | if not object.hooks then |
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395 | object.hooks = new() |
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396 | end |
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397 | |||
398 | local name |
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399 | |||
400 | if type(rawget(object, 'GetLibraryVersion')) == "function" then |
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401 | name = object:GetLibraryVersion() |
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402 | end |
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403 | if not name and type(object.GetName) == "function" then |
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404 | name = object:GetName() |
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405 | end |
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406 | if not name and type(object.name) == "string" then |
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407 | name = object.name |
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408 | end |
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409 | if not name then |
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410 | for k,v in pairs(_G) do |
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411 | if v == object then |
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412 | name = tostring(k) |
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413 | break |
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414 | end |
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415 | end |
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416 | end |
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417 | |||
418 | object.hooks.name = name |
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419 | end |
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420 | |||
421 | AceHook.OnManualEmbed = AceHook.OnInstanceInit |
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422 | |||
423 | --[[---------------------------------------------------------------------- |
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424 | AceHook:Hook |
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425 | self:Hook("functionName", ["handlerName" | handler]) |
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426 | self:Hook(ObjectName, "Method", ["Handler" | handler]) |
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427 | -------------------------------------------------------------------------]] |
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428 | function AceHook:Hook(arg1, arg2, arg3) |
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429 | if type(arg1)== "string" then |
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430 | if protFuncs[arg1] then |
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431 | if self.hooks.name then |
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432 | AceHook:error("%s tried to hook %q, which is a Blizzard protected function.", self.hooks.name, arg1) |
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433 | else |
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434 | _debug(self, string.format("An Addon tried to hook %q, which is a Blizzard protected function.", arg1)) |
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435 | end |
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436 | else |
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437 | _hookFunc(self, arg1, arg2) |
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438 | end |
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439 | else |
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440 | _hookMeth(self, arg1, arg2, arg3) |
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441 | end |
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442 | end |
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443 | |||
444 | function AceHook:HookScript(arg1, arg2, arg3) |
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445 | _hookMeth(self, arg1, arg2, arg3, true) |
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446 | end |
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447 | |||
448 | --[[---------------------------------------------------------------------- |
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449 | AceHook:IsHooked() |
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450 | self:Hook("functionName") |
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451 | self:Hook(ObjectName, "Method") |
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452 | |||
453 | Returns whether or not the given function is hooked in the current |
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454 | namespace. A hooked, but inactive function is considered NOT |
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455 | hooked in this context. |
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456 | -------------------------------------------------------------------------]] |
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457 | function AceHook:IsHooked(obj, method) |
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458 | if method and obj then |
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459 | if self.hooks and self.hooks[obj] and self.hooks[obj][method] and actives[self.hooks[obj][method].orig] then |
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460 | return true, handlers[self.hooks[obj][method].orig] |
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461 | end |
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462 | else |
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463 | if self.hooks and self.hooks[obj] and actives[self.hooks[obj].orig] then |
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464 | return true, handlers[self.hooks[obj].orig] |
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465 | end |
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466 | end |
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467 | |||
468 | return false, nil |
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469 | end |
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470 | |||
471 | --[[---------------------------------------------------------------------- |
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472 | AceHook:Unhook |
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473 | self:Unhook("functionName") |
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474 | self:Unhook(ObjectName, "Method") |
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475 | -------------------------------------------------------------------------]] |
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476 | function AceHook:Unhook(arg1, arg2) |
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477 | if type(arg1) == "string" then |
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478 | _unhookFunc(self, arg1) |
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479 | else |
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480 | _unhookMeth(self, arg1, arg2) |
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481 | end |
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482 | end |
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483 | |||
484 | --[[---------------------------------------------------------------------- |
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485 | AceHook:UnhookAll - Unhooks all active hooks from the calling source |
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486 | -------------------------------------------------------------------------]] |
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487 | function AceHook:UnhookAll() |
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488 | for key, value in pairs(self.hooks) do |
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489 | if type(key) == "table" then |
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490 | for method in pairs(value) do |
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491 | self:Unhook(key, method) |
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492 | end |
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493 | else |
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494 | self:Unhook(key) |
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495 | end |
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496 | end |
||
497 | end |
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498 | |||
499 | |||
500 | function AceHook:OnEmbedDisable(target) |
||
501 | self.UnhookAll(target) |
||
502 | end |
||
503 | |||
504 | --[[---------------------------------------------------------------------- |
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505 | AceHook:HookReport - Lists registered hooks from this source |
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506 | -------------------------------------------------------------------------]] |
||
507 | |||
508 | function AceHook:HookReport() |
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509 | _debug(self, "This is a list of all active hooks for this object:") |
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510 | if not self.hooks then _debug(self, "No registered hooks.") return end |
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511 | |||
512 | for key, value in pairs(self.hooks) do |
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513 | if type(value) == "table" then |
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514 | for method in pairs(value) do |
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515 | _debug(self, string.format("key: %s method: %q |cff%s|r", tostring(key), method, self.hooks[key][method].active and "00ff00Active" or "ffff00Inactive")) |
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516 | end |
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517 | else |
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518 | _debug(self, string.format("key: %s value: %q |cff%s|r", tostring(key), tostring(value), self.hooks[key].active and "00ff00Active" or "ffff00Inactive")) |
||
519 | end |
||
520 | end |
||
521 | end |
||
522 | |||
523 | --[[--------------------------------------------------------------------------------- |
||
524 | Stub and Library registration |
||
525 | ----------------------------------------------------------------------------------]] |
||
526 | |||
527 | local function activate(self, oldLib, oldDeactivate) |
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528 | AceHook = self |
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529 | |||
530 | AceHook.super.activate(self, oldLib, oldDeactivate) |
||
531 | |||
532 | if oldLib then |
||
533 | self.handlers = oldLib.handlers |
||
534 | self.funcs = oldLib.funcs |
||
535 | self.scripts = oldLib.scripts |
||
536 | self.actives = oldLib.actives |
||
537 | end |
||
538 | |||
539 | if not self.handlers then |
||
540 | self.handlers = {} |
||
541 | end |
||
542 | if not self.funcs then |
||
543 | self.funcs = {} |
||
544 | end |
||
545 | if not self.scripts then |
||
546 | self.scripts = {} |
||
547 | end |
||
548 | if not self.actives then |
||
549 | self.actives = {} |
||
550 | end |
||
551 | |||
552 | handlers = self.handlers |
||
553 | funcs = self.funcs |
||
554 | scripts = self.scripts |
||
555 | actives = self.actives |
||
556 | |||
557 | if oldDeactivate then |
||
558 | oldDeactivate(oldLib) |
||
559 | end |
||
560 | end |
||
561 | |||
562 | AceLibrary:Register(AceHook, MAJOR_VERSION, MINOR_VERSION, activate) |