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: 11577 $ |
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4 | Developed by: The Ace Development Team (http://www.wowace.com/index.php/The_Ace_Development_Team) |
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5 | Inspired By: Ace 1.x by Turan (turan@gryphon.com) |
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6 | Website: http://www.wowace.com/ |
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7 | Documentation: http://www.wowace.com/index.php/AceHook-2.0 |
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8 | SVN: http://svn.wowace.com/root/trunk/Ace2/AceHook-2.0 |
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9 | Description: Mixin to allow for safe hooking of functions, methods, and scripts. |
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10 | Dependencies: AceLibrary, AceOO-2.0 |
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11 | ]] |
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12 | |||
13 | local MAJOR_VERSION = "AceHook-2.0" |
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14 | local MINOR_VERSION = "$Revision: 11577 $" |
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15 | |||
16 | -- This ensures the code is only executed if the libary doesn't already exist, or is a newer version |
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17 | if not AceLibrary then error(MAJOR_VERSION .. " requires AceLibrary.") end |
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18 | if not AceLibrary:IsNewVersion(MAJOR_VERSION, MINOR_VERSION) then return end |
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19 | |||
20 | if not AceLibrary:HasInstance("AceOO-2.0") then error(MAJOR_VERSION .. " requires AceOO-2.0") end |
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21 | |||
22 | --[[--------------------------------------------------------------------------------- |
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23 | Create the library object |
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24 | ----------------------------------------------------------------------------------]] |
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25 | |||
26 | local AceOO = AceLibrary:GetInstance("AceOO-2.0") |
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27 | local AceHook = AceOO.Mixin { |
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28 | "Hook", |
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29 | "Unhook", |
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30 | "UnhookAll", |
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31 | "HookReport", |
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32 | "IsHooked", |
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33 | "HookScript", |
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34 | } |
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35 | |||
36 | local table_setn |
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37 | do |
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38 | local version = GetBuildInfo() |
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39 | if string.find(version, "^2%.") then |
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40 | -- 2.0.0 |
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41 | table_setn = function() end |
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42 | else |
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43 | table_setn = table.setn |
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44 | end |
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45 | end |
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46 | |||
47 | --[[--------------------------------------------------------------------------------- |
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48 | Library Definitions |
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49 | ----------------------------------------------------------------------------------]] |
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50 | |||
51 | local protFuncs = { |
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52 | CameraOrSelectOrMoveStart = true, CameraOrSelectOrMoveStop = true, |
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53 | TurnOrActionStart = true, TurnOrActionStop = true, |
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54 | PitchUpStart = true, PitchUpStop = true, |
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55 | PitchDownStart = true, PitchDownStop = true, |
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56 | MoveBackwardStart = true, MoveBackwardStop = true, |
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57 | MoveForwardStart = true, MoveForwardStop = true, |
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58 | Jump = true, StrafeLeftStart = true, |
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59 | StrafeLeftStop = true, StrafeRightStart = true, |
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60 | StrafeRightStop = true, ToggleMouseMove = true, |
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61 | ToggleRun = true, TurnLeftStart = true, |
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62 | TurnLeftStop = true, TurnRightStart = true, |
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63 | TurnRightStop = true, |
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64 | } |
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65 | |||
66 | local _G = getfenv(0) |
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67 | |||
68 | local handlers, funcs, scripts, actives |
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69 | |||
70 | --[[--------------------------------------------------------------------------------- |
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71 | Private definitions (Not exposed) |
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72 | ----------------------------------------------------------------------------------]] |
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73 | |||
74 | --[[---------------------------------------------------------------------- |
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75 | _debug - Internal Method |
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76 | -------------------------------------------------------------------------]] |
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77 | local function print(text) |
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78 | DEFAULT_CHAT_FRAME:AddMessage(text) |
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79 | end |
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80 | |||
81 | local function _debug(self, msg) |
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82 | local name = self.hooks.name |
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83 | if name then |
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84 | print(string.format("[%s]: %s", name, msg)) |
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85 | else |
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86 | print(msg) |
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87 | end |
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88 | end |
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89 | |||
90 | local new, del |
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91 | do |
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92 | local list = setmetatable({}, {__mode = "k"}) |
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93 | function new() |
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94 | local t = next(list) |
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95 | if not t then |
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96 | return {} |
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97 | end |
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98 | list[t] = nil |
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99 | return t |
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100 | end |
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101 | |||
102 | function del(t) |
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103 | setmetatable(t, nil) |
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104 | table_setn(t, 0) |
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105 | for k in pairs(t) do |
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106 | t[k] = nil |
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107 | end |
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108 | list[t] = true |
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109 | end |
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110 | end |
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111 | |||
112 | local origMetatable = { |
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113 | __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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114 | 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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115 | end |
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116 | } |
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117 | |||
118 | --[[---------------------------------------------------------------------- |
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119 | AceHook:_getFunctionHook- internal method |
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120 | -------------------------------------------------------------------------]] |
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121 | |||
122 | local function _getFunctionHook(self, func, handler, orig) |
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123 | if type(handler) == "string" then |
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124 | -- The handler is a method, need to self it |
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125 | 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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126 | if actives[orig] then |
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127 | 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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128 | else |
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129 | 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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130 | end |
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131 | end |
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132 | else |
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133 | -- The handler is a function, just call it |
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134 | 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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135 | if actives[orig] then |
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136 | 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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137 | else |
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138 | 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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139 | end |
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140 | end |
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141 | end |
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142 | end |
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143 | |||
144 | --[[---------------------------------------------------------------------- |
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145 | AceHook:_getMethodHook - Internal Method |
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146 | -------------------------------------------------------------------------]] |
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147 | local function _getMethodHook(self, object, method, handler, orig, script) |
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148 | if type(handler) == "string" then |
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149 | -- The handler is a method, need to self it |
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150 | if script then |
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151 | return function() |
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152 | if actives[orig] then |
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153 | return self[handler](self, object) |
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154 | else |
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155 | return orig() |
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156 | end |
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157 | end |
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158 | else |
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159 | 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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160 | if actives[orig] then |
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161 | 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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162 | else |
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163 | 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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164 | end |
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165 | end |
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166 | end |
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167 | else |
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168 | -- The handler is a function, just call it |
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169 | if script then |
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170 | return function() |
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171 | if actives[orig] then |
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172 | return handler(object) |
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173 | else |
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174 | return orig() |
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175 | end |
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176 | end |
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177 | else |
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178 | 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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179 | if actives[orig] then |
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180 | 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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181 | else |
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182 | 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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183 | end |
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184 | end |
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185 | end |
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186 | end |
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187 | end |
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188 | |||
189 | --[[---------------------------------------------------------------------- |
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190 | AceHook:HookFunc - internal method. |
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191 | o You can only hook each function once from each source. |
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192 | o If there is an inactive hook for this func/handler pair, we reactivate it |
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193 | o If there is an inactive hook for another handler, we error out. |
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194 | o Looks for handler as a method of the calling class, error if not available |
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195 | o If handler is a function, it just uses it directly through the wrapper |
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196 | -------------------------------------------------------------------------]] |
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197 | local function _hookFunc(self, func, handler) |
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198 | local orig = _G[func] |
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199 | |||
200 | if not orig or type(orig) ~= "function" then |
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201 | _debug(self, string.format("Attempt to hook a non-existant function %q", func),3) |
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202 | return |
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203 | end |
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204 | |||
205 | if not handler then handler = func end |
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206 | |||
207 | if self.hooks[func] then |
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208 | local orig = self.hooks[func].orig |
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209 | -- We have an active hook from this source. Don't multi-hook |
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210 | if actives[orig] then |
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211 | _debug(self, string.format("%q already has an active hook from this source.", func)) |
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212 | return |
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213 | end |
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214 | -- The hook is inactive, so reactivate it |
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215 | if handlers[orig] == handler then |
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216 | actives[orig] = true |
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217 | return |
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218 | else |
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219 | AceHook:error("There is a stale hook for %q can't hook or reactivate.", func) |
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220 | end |
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221 | end |
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222 | |||
223 | if type(handler) == "string" then |
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224 | if type(self[handler]) ~= "function" then |
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225 | AceHook:error("Could not find the the handler %q when hooking function %q", handler, func) |
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226 | end |
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227 | elseif type(handler) ~= "function" then |
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228 | AceHook:error("Could not find the handler you supplied when hooking %q", func) |
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229 | end |
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230 | |||
231 | local t = setmetatable(new(), origMetatable) |
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232 | self.hooks[func] = t |
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233 | t.orig = orig |
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234 | |||
235 | actives[orig] = true |
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236 | handlers[orig] = handler |
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237 | local newFunc = _getFunctionHook(self, func, handler, orig) |
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238 | funcs[orig] = newFunc |
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239 | |||
240 | _G[func] = newFunc |
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241 | end |
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242 | |||
243 | --[[---------------------------------------------------------------------- |
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244 | AceHook:UnhookFunc - internal method |
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245 | o If you attempt to unhook a function that has never been hooked, or to unhook in a |
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246 | system that has never had a hook before, the system will error with a stack trace |
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247 | o If we own the global function, then put the original back in its place and remove |
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248 | all references to the Hooks[func] structure. |
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249 | o If we don't own the global function (we've been hooked) we deactivate the hook, |
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250 | forcing the handler to passthrough. |
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251 | -------------------------------------------------------------------------]] |
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252 | local function _unhookFunc(self, func) |
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253 | if not self.hooks[func] or not funcs[self.hooks[func].orig] then |
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254 | _debug(self, string.format("Tried to unhook %q which is not currently hooked.", func)) |
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255 | return |
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256 | end |
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257 | |||
258 | local orig = self.hooks[func].orig |
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259 | |||
260 | if actives[orig] then |
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261 | -- See if we own the global function |
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262 | if _G[func] == funcs[orig] then |
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263 | _G[func] = orig |
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264 | self.hooks[func] = del(self.hooks[func]) |
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265 | handlers[orig] = nil |
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266 | funcs[orig] = nil |
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267 | scripts[orig] = nil |
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268 | actives[orig] = nil |
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269 | -- Magically all-done |
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270 | else |
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271 | actives[orig] = nil |
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272 | end |
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273 | end |
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274 | end |
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275 | |||
276 | --[[---------------------------------------------------------------------- |
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277 | AceHook:HookMeth - Takes an optional fourth argument |
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278 | o script - Signifies whether this is a script hook or not |
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279 | -------------------------------------------------------------------------]] |
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280 | |||
281 | local function _hookMeth(self, obj, method, handler, script) |
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282 | if not handler then handler = method end |
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283 | if (not obj or type(obj) ~= "table") then |
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284 | AceHook:error("The object you supplied could not be found, or isn't a table.") |
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285 | end |
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286 | |||
287 | if self.hooks[obj] and self.hooks[obj][method] then |
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288 | local orig = self.hooks[obj][method].orig |
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289 | -- We have an active hook from this source. Don't multi-hook |
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290 | if actives[orig] then |
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291 | _debug(self, string.format("%q already has an active hook from this source.", method)) |
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292 | return |
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293 | end |
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294 | -- The hook is inactive, so reactivate it. |
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295 | if handlers[orig] == handler then |
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296 | actives[orig] = true |
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297 | return |
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298 | else |
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299 | AceHook:error("There is a stale hook for %q can't hook or reactivate.", method) |
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300 | end |
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301 | end |
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302 | -- We're clear to try the hook, let's make some checks first |
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303 | if type(handler) == "string" then |
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304 | if type(self[handler]) ~= "function" then |
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305 | AceHook:error("Could not find the handler %q you supplied when hooking method %q", handler, method) |
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306 | end |
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307 | elseif type(handler) ~= "function" then |
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308 | AceHook:error("Could not find the handler you supplied when hooking method %q", method) |
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309 | end |
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310 | -- Handler has been found, so now try to find the method we're trying to hook |
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311 | local orig |
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312 | -- Script |
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313 | if script then |
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314 | if not obj.GetScript then |
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315 | AceHook:error("The object you supplied does not have a GetScript method.") |
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316 | end |
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317 | if not obj:HasScript(method) then |
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318 | AceHook:error("The object you supplied doesn't allow the %q method.", method) |
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319 | end |
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320 | -- Sometimes there is not a original function for a script. |
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321 | orig = obj:GetScript(method) |
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322 | if not orig then |
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323 | orig = function() end |
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324 | end |
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325 | -- Method |
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326 | else |
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327 | orig = obj[method] |
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328 | end |
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329 | if not orig then |
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330 | AceHook:error("Could not find the method or script %q you are trying to hook.", method) |
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331 | end |
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332 | if not self.hooks[obj] then |
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333 | self.hooks[obj] = new() |
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334 | end |
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335 | local t = setmetatable(new(), origMetatable) |
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336 | self.hooks[obj][method] = t |
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337 | t.orig = orig |
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338 | |||
339 | actives[orig] = true |
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340 | handlers[orig] = handler |
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341 | scripts[orig] = script and true or nil |
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342 | local newFunc = _getMethodHook(self, obj, method, handler, orig, script) |
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343 | funcs[orig] = newFunc |
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344 | |||
345 | if script then |
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346 | obj:SetScript(method, newFunc) |
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347 | else |
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348 | obj[method] = newFunc |
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349 | end |
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350 | end |
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351 | |||
352 | --[[---------------------------------------------------------------------- |
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353 | AceHook:UnhookMeth - Internal method |
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354 | o If you attempt to unhook a method that has never been hooked, or to unhook in a |
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355 | system that has never had a hook before, the system will error with a stack trace |
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356 | o If we own the global method, then put the original back in its place and remove |
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357 | all references to the Hooks[obj][method] structure. |
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358 | o If we don't own the global method (we've been hooked) we deactivate the hook, |
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359 | forcing the handler to passthrough. |
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360 | -------------------------------------------------------------------------]] |
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361 | local function _unhookMeth(self, obj, method) |
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362 | if not self.hooks[obj] or not self.hooks[obj][method] or not funcs[self.hooks[obj][method].orig] then |
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363 | _debug(self, string.format("Attempt to unhook a method %q that is not currently hooked.", method)) |
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364 | return |
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365 | end |
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366 | |||
367 | local orig = self.hooks[obj][method].orig |
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368 | |||
369 | if actives[orig] then |
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370 | -- If this is a script |
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371 | if scripts[orig] then |
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372 | if obj:GetScript(method) == funcs[orig] then |
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373 | -- We own the script. Kill it. |
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374 | obj:SetScript(method, orig) |
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375 | self.hooks[obj][method] = del(self.hooks[obj][method]) |
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376 | handlers[orig] = nil |
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377 | funcs[orig] = nil |
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378 | scripts[orig] = nil |
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379 | actives[orig] = nil |
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380 | else |
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381 | actives[orig] = nil |
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382 | end |
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383 | else |
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384 | if obj[method] == funcs[orig] then |
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385 | -- We own the method. Kill it. |
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386 | obj[method] = orig |
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387 | self.hooks[obj][method] = del(self.hooks[obj][method]) |
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388 | handlers[orig] = nil |
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389 | funcs[orig] = nil |
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390 | scripts[orig] = nil |
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391 | actives[orig] = nil |
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392 | else |
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393 | actives[orig] = nil |
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394 | end |
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395 | end |
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396 | end |
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397 | if not next(self.hooks[obj]) then |
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398 | -- Spank the table |
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399 | self.hooks[obj] = del(self.hooks[obj]) |
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400 | end |
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401 | end |
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402 | |||
403 | function AceHook:OnInstanceInit(object) |
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404 | if not object.hooks then |
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405 | object.hooks = new() |
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406 | end |
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407 | |||
408 | local name |
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409 | |||
410 | if type(rawget(object, 'GetLibraryVersion')) == "function" then |
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411 | name = object:GetLibraryVersion() |
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412 | end |
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413 | if not name and type(object.GetName) == "function" then |
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414 | name = object:GetName() |
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415 | end |
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416 | if not name and type(object.name) == "string" then |
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417 | name = object.name |
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418 | end |
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419 | if not name then |
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420 | for k,v in pairs(_G) do |
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421 | if v == object then |
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422 | name = tostring(k) |
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423 | break |
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424 | end |
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425 | end |
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426 | end |
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427 | |||
428 | object.hooks.name = name |
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429 | end |
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430 | |||
431 | AceHook.OnManualEmbed = AceHook.OnInstanceInit |
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432 | |||
433 | --[[---------------------------------------------------------------------- |
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434 | AceHook:Hook |
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435 | self:Hook("functionName", ["handlerName" | handler]) |
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436 | self:Hook(ObjectName, "Method", ["Handler" | handler]) |
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437 | -------------------------------------------------------------------------]] |
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438 | function AceHook:Hook(arg1, arg2, arg3) |
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439 | if type(arg1)== "string" then |
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440 | if protFuncs[arg1] then |
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441 | if self.hooks.name then |
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442 | AceHook:error("%s tried to hook %q, which is a Blizzard protected function.", self.hooks.name, arg1) |
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443 | else |
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444 | _debug(self, string.format("An Addon tried to hook %q, which is a Blizzard protected function.", arg1)) |
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445 | end |
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446 | else |
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447 | _hookFunc(self, arg1, arg2) |
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448 | end |
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449 | else |
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450 | _hookMeth(self, arg1, arg2, arg3) |
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451 | end |
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452 | end |
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453 | |||
454 | function AceHook:HookScript(arg1, arg2, arg3) |
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455 | _hookMeth(self, arg1, arg2, arg3, true) |
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456 | end |
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457 | |||
458 | --[[---------------------------------------------------------------------- |
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459 | AceHook:IsHooked() |
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460 | self:Hook("functionName") |
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461 | self:Hook(ObjectName, "Method") |
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462 | |||
463 | Returns whether or not the given function is hooked in the current |
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464 | namespace. A hooked, but inactive function is considered NOT |
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465 | hooked in this context. |
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466 | -------------------------------------------------------------------------]] |
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467 | function AceHook:IsHooked(obj, method) |
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468 | if method and obj then |
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469 | if self.hooks and self.hooks[obj] and self.hooks[obj][method] and actives[self.hooks[obj][method].orig] then |
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470 | return true, handlers[self.hooks[obj][method].orig] |
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471 | end |
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472 | else |
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473 | if self.hooks and self.hooks[obj] and actives[self.hooks[obj].orig] then |
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474 | return true, handlers[self.hooks[obj].orig] |
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475 | end |
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476 | end |
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477 | |||
478 | return false, nil |
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479 | end |
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480 | |||
481 | --[[---------------------------------------------------------------------- |
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482 | AceHook:Unhook |
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483 | self:Unhook("functionName") |
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484 | self:Unhook(ObjectName, "Method") |
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485 | -------------------------------------------------------------------------]] |
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486 | function AceHook:Unhook(arg1, arg2) |
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487 | if type(arg1) == "string" then |
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488 | _unhookFunc(self, arg1) |
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489 | else |
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490 | _unhookMeth(self, arg1, arg2) |
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491 | end |
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492 | end |
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493 | |||
494 | --[[---------------------------------------------------------------------- |
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495 | AceHook:UnhookAll - Unhooks all active hooks from the calling source |
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496 | -------------------------------------------------------------------------]] |
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497 | function AceHook:UnhookAll() |
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498 | for key, value in pairs(self.hooks) do |
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499 | if type(key) == "table" then |
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500 | for method in pairs(value) do |
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501 | self:Unhook(key, method) |
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502 | end |
||
503 | else |
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504 | self:Unhook(key) |
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505 | end |
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506 | end |
||
507 | end |
||
508 | |||
509 | |||
510 | function AceHook:OnEmbedDisable(target) |
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511 | self.UnhookAll(target) |
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512 | end |
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513 | |||
514 | --[[---------------------------------------------------------------------- |
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515 | AceHook:HookReport - Lists registered hooks from this source |
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516 | -------------------------------------------------------------------------]] |
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517 | |||
518 | function AceHook:HookReport() |
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519 | _debug(self, "This is a list of all active hooks for this object:") |
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520 | if not self.hooks then _debug(self, "No registered hooks.") return end |
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521 | |||
522 | for key, value in pairs(self.hooks) do |
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523 | if type(value) == "table" then |
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524 | for method in pairs(value) do |
||
525 | _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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526 | end |
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527 | else |
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528 | _debug(self, string.format("key: %s value: %q |cff%s|r", tostring(key), tostring(value), self.hooks[key].active and "00ff00Active" or "ffff00Inactive")) |
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529 | end |
||
530 | end |
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531 | end |
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532 | |||
533 | --[[--------------------------------------------------------------------------------- |
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534 | Stub and Library registration |
||
535 | ----------------------------------------------------------------------------------]] |
||
536 | |||
537 | local function activate(self, oldLib, oldDeactivate) |
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538 | AceHook = self |
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539 | |||
540 | AceHook.super.activate(self, oldLib, oldDeactivate) |
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541 | |||
542 | if oldLib then |
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543 | self.handlers = oldLib.handlers |
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544 | self.funcs = oldLib.funcs |
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545 | self.scripts = oldLib.scripts |
||
546 | self.actives = oldLib.actives |
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547 | end |
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548 | |||
549 | if not self.handlers then |
||
550 | self.handlers = {} |
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551 | end |
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552 | if not self.funcs then |
||
553 | self.funcs = {} |
||
554 | end |
||
555 | if not self.scripts then |
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556 | self.scripts = {} |
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557 | end |
||
558 | if not self.actives then |
||
559 | self.actives = {} |
||
560 | end |
||
561 | |||
562 | handlers = self.handlers |
||
563 | funcs = self.funcs |
||
564 | scripts = self.scripts |
||
565 | actives = self.actives |
||
566 | |||
567 | if oldDeactivate then |
||
568 | oldDeactivate(oldLib) |
||
569 | end |
||
570 | end |
||
571 | |||
572 | AceLibrary:Register(AceHook, MAJOR_VERSION, MINOR_VERSION, activate) |