lua 工具类（一）

--
-- Author: My Name
-- Date: 2013-12-16 18:52:11
-- csv解析  
-- 
  
-- 去掉字符串左空白  
local function trim_left(s)  
    return string.gsub(s, "^%s+", "");  
end  
  
-- 去掉字符串右空白  
local function trim_right(s)  
    return string.gsub(s, "%s+$", "");  
end  
  
-- 解析一行  
local function parseline(line)  
    local ret = {};  
  
    local s = line .. ",";  -- 添加逗号,保证能得到最后一个字段  
  
    while (s ~= "") do  
        --print(0,s);  
        local v = "";  
        local tl = true;  
        local tr = true;  
  
        while(s ~= "" and string.find(s, "^,") == nil) do  
            --print(1,s);  
            if(string.find(s, "^"")) then  
                local _,_,vx,vz = string.find(s, "^"(.-)"(.*)");  
                --print(2,vx,vz);  
                if(vx == nil) then  
                    return nil;  -- 不完整的一行  
                end  
  
                -- 引号开头的不去空白  
                if(v == "") then  
                    tl = false;  
                end  
  
                v = v..vx;  
                s = vz;  
  
                --print(3,v,s);  
  
                while(string.find(s, "^"")) do  
                    local _,_,vx,vz = string.find(s, "^"(.-)"(.*)");  
                    --print(4,vx,vz);  
                    if(vx == nil) then  
                        return nil;  
                    end  
  
                    v = v.."""..vx;  
                    s = vz;  
                    --print(5,v,s);  
                end  
  
                tr = true;  
            else  
                local _,_,vx,vz = string.find(s, "^(.-)([,"].*)");  
                --print(6,vx,vz);  
                if(vx~=nil) then  
                    v = v..vx;  
                    s = vz;  
                else  
                    v = v..s;  
                    s = "";  
                end  
                --print(7,v,s);  
  
                tr = false;  
            end  
        end  
  
        if(tl) then v = trim_left(v); end  
        if(tr) then v = trim_right(v); end  
  
        ret[table.getn(ret)+1] = v;  
        --print(8,"ret["..table.getn(ret).."]=".."""..v..""");  
  
        if(string.find(s, "^,")) then  
            s = string.gsub(s,"^,", "");  
        end  
  
    end  
  
    return ret;  
end  
  
  
  
--解析csv文件的每一行  
local function getRowContent(file)  
    local content;  
  
    local check = false  
    local count = 0  
    while true do  
        local t = file:read()  
        if not t then  if count==0 then check = true end  break end  
  
        if not content then  
            content = t  
        else  
            content = content..t  
        end  
  
        local i = 1  
        while true do  
            local index = string.find(t, """, i)  
            if not index then break end  
            i = index + 1  
            count = count + 1  
        end  
  
        if count % 2 == 0 then check = true break end  
    end  
  
    if not check then  assert(1~=1) end  
    return content  
end  
  
  
  
--解析csv文件  
function LoadCsv(fileName)  
    local ret = {};  
  
    local file = io.open(fileName, "r")  
    assert(file)  
    local content = {}  
    while true do  
        local line = getRowContent(file)  
        if not line then break end  
        table.insert(content, line)  
    end  
  
    for k,v in pairs(content) do  
        ret[table.getn(ret)+1] = parseline(v);  
    end  
  
  
    file:close()  
  
    return ret  
end  

function Csv2Lua(fileName, filePath, desFilePath )
    local t = LoadCsv(filePath);
    if t then
        t = luautil.serialize(fileName,t);
    end
    if t then
        luautil.writefile(t, desFilePath) 
    end
end

--test  
--local t= LoadCsv("csvtesttxt.csv")  
--for k,v in pairs(t) do  
--  local tt = v  
--  local s = ""  
--  for i,j in pairs(tt) do  
--      s = string.format("%s,%s",s,j)  
--  end  
--  print ("",s)  
--end