Rename 'instance' to 'context'

examples/assemblageTest/init.lua

@@ -1,11 +1,11 @@
-local Concord = require("lib")
+local Concord = require("src")
 
 local Entity     = Concord.entity
 local Component  = Concord.component
 local System     = Concord.system
 local Assemblage = Concord.assemblage
 
-local Game = Concord.instance()
+local Game = Concord.context()
 
 local Legs = Component(function(e, legCount)
    e.legCount = legCount or 0

examples/baseLayout/main.lua

@@ -1,6 +1,6 @@
 local PATH = (...):gsub('%.[^%.]+$', '')
 
-local Concord = require("lib")
+local Concord = require("src")
 
 local C = require(PATH..".src.components")
 local S = require(PATH..".src.systems")

examples/simpleDrawing/init.lua

@@ -1,10 +1,10 @@
-local Concord = require("lib")
+local Concord = require("src")
 
 local Entity    = Concord.entity
 local Component = Concord.component
 local System    = Concord.system
 
-local Game = Concord.instance()
+local Game = Concord.context()
 
 local Position = Component(function(e, x, y)
    e.x = x

src/context.lua

@@ -1,17 +1,17 @@
---- Instance
+--- Context
 
 local PATH = (...):gsub('%.[^%.]+$', '')
 
 local Type   = require(PATH..".type")
 local List   = require(PATH..".list")
 
-local Instance = {}
-Instance.__index = Instance
+local Context = {}
+Context.__index = Context
 
---- Creates a new Instance.
--- @return The new instance
-function Instance.new()
-   local instance = setmetatable({
+--- Creates a new Context.
+-- @return The new context
+function Context.new()
+   local context = setmetatable({
       entities = List(),
       systems  = List(),
       events   = {},
@@ -19,35 +19,35 @@ function Instance.new()
       marked   = {},
       removed  = {},
 
-      __isInstance = true,
-   }, Instance)
+      __isContext = true,
+   }, Context)
 
-   return instance
+   return context
 end
 
---- Adds an Entity to the Instance.
+--- Adds an Entity to the Context.
 -- @param e The Entity to add
 -- @return self
-function Instance:addEntity(e)
+function Context:addEntity(e)
    if not Type.isEntity(e) then
-      error("bad argument #1 to 'Instance:addEntity' (Entity expected, got "..type(e)..")", 2)
+      error("bad argument #1 to 'Context:addEntity' (Entity expected, got "..type(e)..")", 2)
    end
 
    self:onEntityAdded(e)
 
-   e.instances:add(self)
+   e.contexts:add(self)
    self.entities:add(e)
    self:checkEntity(e)
 
    return self
 end
 
---- Marks an Entity as removed from the Instance.
+--- Marks an Entity as removed from the Context.
 -- @param e The Entity to mark
 -- @return self
-function Instance:removeEntity(e)
+function Context:removeEntity(e)
    if not Type.isEntity(e) then
-      error("bad argument #1 to 'Instance:removeEntity' (Entity expected, got "..type(e)..")", 2)
+      error("bad argument #1 to 'Context:removeEntity' (Entity expected, got "..type(e)..")", 2)
    end
 
    self.removed[#self.removed + 1] = e
@@ -55,9 +55,9 @@ function Instance:removeEntity(e)
    return self
 end
 
-function Instance:markEntity(e)
+function Context:markEntity(e)
    if not Type.isEntity(e) then
-      error("bad argument #1 to 'Instance:markEntity' (Entity expected, got "..type(e)..")", 2)
+      error("bad argument #1 to 'Context:markEntity' (Entity expected, got "..type(e)..")", 2)
    end
 
    self.marked[#self.marked + 1] = e
@@ -65,12 +65,12 @@ function Instance:markEntity(e)
    return self
 end
 
---- Checks an Entity against all the systems in the Instance.
+--- Checks an Entity against all the systems in the Context.
 -- @param e The Entity to check
 -- @return self
-function Instance:checkEntity(e)
+function Context:checkEntity(e)
    if not Type.isEntity(e) then
-      error("bad argument #1 to 'Instance:checkEntity' (Entity expected, got "..type(e)..")", 2)
+      error("bad argument #1 to 'Context:checkEntity' (Entity expected, got "..type(e)..")", 2)
    end
 
    for i = 1, self.systems.size do
@@ -80,9 +80,9 @@ function Instance:checkEntity(e)
    return self
 end
 
---- Completely removes all marked Entities in the Instance.
+--- Completely removes all marked Entities in the Context.
 -- @return self
-function Instance:flush()
+function Context:flush()
    while #self.marked > 0 do
       local marked = self.removed
       self.removed  = {}
@@ -90,8 +90,8 @@ function Instance:flush()
       for i = 1, #marked do
          local e = marked[i]
 
-         e.instances:apply()
-         e.instances:checkEntity(e)
+         e.contexts:apply()
+         e.contexts:checkEntity(e)
       end
    end
 
@@ -102,7 +102,7 @@ function Instance:flush()
       for i = 1, #removed do
          local e = removed[i]
 
-         e.instances:remove(self)
+         e.contexts:remove(self)
          self.entities:remove(e)
 
          for j = 1, self.systems.size do
@@ -122,24 +122,24 @@ function Instance:flush()
    return self
 end
 
---- Adds a System to the Instance.
+--- Adds a System to the Context.
 -- @param system The System to add
 -- @param eventName The Event to register to
 -- @param callback The function name to call. Defaults to eventName
 -- @param enabled If the system is enabled. Defaults to true
 -- @return self
-function Instance:addSystem(system, eventName, callback, enabled)
+function Context:addSystem(system, eventName, callback, enabled)
    if not Type.isSystem(system) then
-      error("bad argument #1 to 'Instance:addSystem' (System expected, got "..type(system)..")", 2)
+      error("bad argument #1 to 'Context:addSystem' (System expected, got "..type(system)..")", 2)
    end
 
-   if system.__instance and system.__instance ~= self then
-      error("System already in instance '" ..tostring(system.__instance).."'")
+   if system.__context and system.__context ~= self then
+      error("System already in context '" ..tostring(system.__context).."'")
    end
 
    if not self.systems:has(system) then
       self.systems:add(system)
-      system.__instance = self
+      system.__context = self
 
       system:addedTo(self)
    end
@@ -169,41 +169,41 @@ function Instance:addSystem(system, eventName, callback, enabled)
    return self
 end
 
---- Enables a System in the Instance.
+--- Enables a System in the Context.
 -- @param system The System to enable
 -- @param eventName The Event it was registered to
 -- @param callback The callback it was registered with. Defaults to eventName
 -- @return self
-function Instance:enableSystem(system, eventName, callback)
+function Context:enableSystem(system, eventName, callback)
    if not Type.isSystem(system) then
-      error("bad argument #1 to 'Instance:enableSystem' (System expected, got "..type(system)..")", 2)
+      error("bad argument #1 to 'Context:enableSystem' (System expected, got "..type(system)..")", 2)
    end
 
    return self:setSystem(system, eventName, callback, true)
 end
 
---- Disables a System in the Instance.
+--- Disables a System in the Context.
 -- @param system The System to disable
 -- @param eventName The Event it was registered to
 -- @param callback The callback it was registered with. Defaults to eventName
 -- @return self
-function Instance:disableSystem(system, eventName, callback)
+function Context:disableSystem(system, eventName, callback)
    if not Type.isSystem(system) then
-      error("bad argument #1 to 'Instance:disableSystem' (System expected, got "..type(system)..")", 2)
+      error("bad argument #1 to 'Context:disableSystem' (System expected, got "..type(system)..")", 2)
    end
 
    return self:setSystem(system, eventName, callback, false)
 end
 
---- Sets a System 'enable' in the Instance.
+--- Sets a System 'enable' in the Context.
 -- @param system The System to set
 -- @param eventName The Event it was registered to
 -- @param callback The callback it was registered with. Defaults to eventName
 -- @param enable The state to set it to
 -- @return self
-function Instance:setSystem(system, eventName, callback, enable)
+function Context:setSystem(system, eventName, callback, enable)
    if not Type.isSystem(system) then
-      error("bad argument #1 to 'Instance:setSystem' (System expected, got "..type(system)..")", 2)
+      error("bad argument #1 to 'Context:setSystem' (System expected, got "..type(system)..")", 2)
    end
 
    callback = callback or eventName
@@ -233,13 +233,13 @@ function Instance:setSystem(system, eventName, callback, enable)
    return self
 end
 
---- Emits an Event in the Instance.
+--- Emits an Event in the Context.
 -- @param eventName The Event that should be emitted
 -- @param ... Parameters passed to listeners
 -- @return self
-function Instance:emit(eventName, ...)
+function Context:emit(eventName, ...)
    if not eventName or type(eventName) ~= "string" then
-      error("bad argument #1 to 'Instance:emit' (String expected, got "..type(eventName)..")")
+      error("bad argument #1 to 'Context:emit' (String expected, got "..type(eventName)..")")
    end
 
    self:flush()
@@ -259,9 +259,9 @@ function Instance:emit(eventName, ...)
    return self
 end
 
---- Removes all entities from the Instance
+--- Removes all entities from the Context
 -- @return self
-function Instance:clear()
+function Context:clear()
    for i = 1, self.entities.size do
       self.entities:get(i):destroy()
    end
@@ -273,16 +273,16 @@ end
 
 --- Default callback for adding an Entity.
 -- @param e The Entity that was added
-function Instance:onEntityAdded(e) -- luacheck: ignore
+function Context:onEntityAdded(e) -- luacheck: ignore
 end
 
 --- Default callback for removing an Entity.
 -- @param e The Entity that was removed
-function Instance:onEntityRemoved(e) -- luacheck: ignore
+function Context:onEntityRemoved(e) -- luacheck: ignore
 end
 
-return setmetatable(Instance, {
+return setmetatable(Context, {
    __call = function(_, ...)
-      return Instance.new(...)
+      return Context.new(...)
    end,
 })

src/entity.lua

@@ -13,7 +13,7 @@ Entity.__index = Entity
 function Entity.new()
    local e = setmetatable({
       removed   = {},
-      instances = List(),
+      contexts = List(),
 
       __isEntity = true,
    }, Entity)
@@ -86,8 +86,8 @@ function Entity:assemble(assemblage, ...)
 end
 
 function Entity:mark()
-   for i = 1, self.instances.size do
-      self.instances:get(i):markEntity(self)
+   for i = 1, self.contexts.size do
+      self.contexts:get(i):markEntity(self)
    end
 end
 
@@ -106,8 +106,8 @@ end
 --- Destroys the Entity.
 -- @return self
 function Entity:destroy()
-   for i = 1, self.instances.size do
-      self.instances:get(i):removeEntity(self)
+   for i = 1, self.contexts.size do
+      self.contexts:get(i):removeEntity(self)
    end
 
    return self

src/init.lua

@@ -34,7 +34,7 @@ local Concord = {
 Concord.entity     = require(PATH..".entity")
 Concord.component  = require(PATH..".component")
 Concord.system     = require(PATH..".system")
-Concord.instance   = require(PATH..".instance")
+Concord.context    = require(PATH..".context")
 Concord.assemblage = require(PATH..".assemblage")
 
 return Concord

src/system.lua

@@ -11,7 +11,7 @@ System.mt    = {
       local system = setmetatable({
          __all      = {},
          __pools    = {},
-         __instance = nil,
+         __context = nil,
 
          __isSystem = true,
       }, systemProto)
@@ -129,10 +129,10 @@ function System:clear()
    end
 end
 
---- Returns the Instance the System is in.
--- @return The Instance
-function System:getInstance()
-   return self.__instance
+--- Returns the Context the System is in.
+-- @return The Context
+function System:getContext()
+   return self.__context
 end
 
 --- Default callback for system initialization.
@@ -140,9 +140,9 @@ end
 function System:init(...) -- luacheck: ignore
 end
 
--- Default callback for when the System is added to an Instance.
--- @param instance The Instance the System was added to
-function System:addedTo(instance) -- luacheck: ignore
+-- Default callback for when the System is added to an Context.
+-- @param context The Context the System was added to
+function System:addedTo(context) -- luacheck: ignore
 end
 
 -- Default callback for when a System's callback is enabled.

src/type.lua

@@ -14,8 +14,8 @@ function Type.isSystem(t)
    return type(t) == "table" and t.__isSystem
 end
 
-function Type.isInstance(t)
-   return type(t) == "table" and t.__isInstance
+function Type.isContext(t)
+   return type(t) == "table" and t.__isContext
 end
 
 function Type.isAssemblage(t)