commit 76ec7e212db88755e4c3a517124ab88d48d33934
Author: kiritow <1362050620@qq.com>
Date:   Mon Oct 9 22:53:37 2017 +0800

    Initial Commit

diff --git a/SignReader.lua b/SignReader.lua
new file mode 100644
index 0000000..66d96aa
--- /dev/null
+++ b/SignReader.lua
@@ -0,0 +1,53 @@
+require("class")
+local sides=require("sides")
+
+SignReader=class("SignReader")
+
+function SignReader:ctor(sign)
+    self.s=sign
+end
+
+function SignReader:countSigns()
+    local cnt=0
+    if(self:get(sides.north) ~= nil) then cnt=cnt+1 end
+    if(self:get(sides.south) ~= nil) then cnt=cnt+1 end
+    if(self:get(sides.east) ~= nil) then cnt=cnt+1 end
+    if(self:get(sides.west) ~= nil) then cnt=cnt+1 end
+    if(self:get(sides.up) ~= nil) then cnt=cnt+1 end
+    if(self:get(sides.down) ~= nil) then cnt=cnt+1 end
+    return cnt
+end
+
+function SignReader:getFirstSignSide()
+    if(self:get(sides.north)~=nil) then return sides.north end
+    if(self:get(sides.south)~=nil) then return sides.south end
+    if(self:get(sides.east)~=nil) then return sides.east end
+    if(self:get(sides.west)~=nil) then return sides.west end
+    if(self:get(sides.up)~=nil) then return sides.up end
+    if(self:get(sides.down)~=nil) then return sides.down end
+    return -1
+end
+
+function SignReader:get(side)
+    if(side == nil) then -- Try Smart Choice
+        if(self:countSigns() == 1) then
+            return self.s.getValue(self:getFirstSignSide())
+        else
+            return nil -- Cannot choose
+        end
+    else
+        return self.s.getValue(side)
+    end
+end
+
+function SignReader:set(val,side)
+    if(side == nil) then -- Try Smart Choice
+        if(self:countSigns() == 1) then
+            return self.s.setValue(self:getFirstSignSide(),val)
+        else
+            return nil -- Cannot choose
+        end
+    else
+        return self.s.setValue(side,val)
+    end
+end
diff --git a/class.lua b/class.lua
new file mode 100644
index 0000000..8bb5e07
--- /dev/null
+++ b/class.lua
@@ -0,0 +1,75 @@
+function clone(object)
+    local lookup_table = {}
+    local function _copy(object) 
+        if type(object) ~= "table" then
+            return object
+        elseif lookup_table[object] then
+            return lookup_table[object]
+        end
+        local new_table = {}
+        lookup_table[object] = new_table
+        for key, value in pairs(object) do
+            new_table[_copy(key)] = _copy(value)
+        end
+        return setmetatable(new_table, getmetatable(object))
+    end
+    return _copy(object)
+end
+
+function class(classname, super)
+    local superType = type(super)
+    local cls
+    if superType ~= "function" and superType ~= "table" then
+        superType = nil
+        super = nil
+    end
+    if superType == "function" or (super and super.__ctype == 1) then
+        cls = {}
+        if superType == "table" then
+            -- copy fields from super
+            for k, v in pairs(super) do
+                cls[k] = v
+            end
+            cls.__create = super.__create
+            cls.super = super
+        else
+            cls.__create = super
+            cls.ctor = function()
+            end
+        end
+        cls.__cname = classname
+        cls.__ctype = 1
+		
+        function cls.new(...)
+            local instance = cls.__create(...)
+            for k, v in pairs(cls) do
+                instance[k] = v
+            end
+            instance.class = cls
+            instance:ctor(...)
+            return instance
+        end
+    else
+        if super then
+            cls = {}
+            setmetatable(cls, {__index = super})
+            cls.super = super
+        else
+            cls = {ctor = function()
+                end}
+        end
+
+        cls.__cname = classname
+        cls.__ctype = 2 -- lua
+        cls.__index = cls
+
+        function cls.new(...)
+            local instance = setmetatable({}, cls)
+            instance.class = cls
+            instance:ctor(...)
+            return instance
+        end
+    end
+
+    return cls
+end
diff --git a/queue.lua b/queue.lua
new file mode 100644
index 0000000..6087da0
--- /dev/null
+++ b/queue.lua
@@ -0,0 +1,55 @@
+require("class")
+
+Queue = class("Queue")
+
+function Queue:reset()
+    self.size = 0
+    self.bus = {}
+    self.headindex = -1
+    self.tailindex = -1
+end
+
+function Queue:ctor()
+    self:reset()
+end
+
+function Queue:empty()
+    return self.size == 0
+end
+
+function Queue:push(val)
+    if (self:empty()) then
+        self.headindex = 0
+        self.tailindex = 0
+        self.size = 1
+        self.bus[0] = val
+    else
+        self.tailindex = self.tailindex + 1
+        self.bus[self.tailindex] = val
+        self.size = self.size + 1
+    end
+end
+
+function Queue:top()
+    if(self:empty()) then
+        return nil
+    else
+        return self.bus[self.headindex]
+    end
+end
+
+function Queue:pop()
+    if (self:empty()) then
+        return nil
+    else
+        ret = self.bus[self.headindex]
+        self.bus[self.headindex] = nil
+        self.size = self.size - 1
+        if (self:empty()) then
+            self:reset()
+        else
+            self.headindex = self.headindex + 1
+        end
+        return ret
+    end
+end
diff --git a/util.lua b/util.lua
new file mode 100644
index 0000000..eca4da3
--- /dev/null
+++ b/util.lua
@@ -0,0 +1,47 @@
+local component=require("component")
+
+function getTableSize(t)
+    local cnt=0
+    for k in pairs(t) do 
+        cnt=cnt+1
+        end
+    return cnt
+end
+
+function isTableEmpty(t)
+    return getTableSize(t) == 0
+end
+
+function rawproxy(id)
+    return component.proxy(id)
+end
+
+function proxy(componentType,beginWith)
+    local t=component.list(componentType)
+    local sz=getTableSize(t)
+    if(sz==0) then
+        print("Query List is Empty")
+        return nil
+    elseif(sz==1) then
+        for k in pairs(t) do
+            return rawproxy(k)
+        end
+    else
+        if(beginWith == nil) then
+            print("No beginWith value")
+            return nil
+        end
+        if(type(beginWith) ~= "string") then
+            print("beginWith is not string")
+            return nil
+        end
+        local bsz=string.len(beginWith)
+        for k in pairs(t) do
+            if(string.sub(k,1,bsz) == beginWith) then
+                return rawproxy(k)
+            end
+        end
+        print("Not found with beginWith value")
+        return nil
+    end
+end