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utils.lua
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utils.lua
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-------------------------------------------------------------------------------
--
-- @script: utils.lua
--
-- @author: Rohit Joshi
--
-- @copyright Joshi Ventures LLC � 2012
--
-- @license Apache License, Version 2.0
--
-- VERSION HISTORY:
-- 1.0 8/09/2012 - Initial release
--
-------------------------------------------------------------------------------
-- Purpose: utility function
-----------------------------------------------------------------------------
--- table value to string
--- @param table value
--- @return string with table value
-----------------------------------------------------------------------------
function table.val_to_str ( v )
if "string" == type( v ) then
v = string.gsub( v, "\n", "\\n" )
if string.match( string.gsub(v,"[^'\"]",""), '^"+$' ) then
return "'" .. v .. "'"
end
return '"' .. string.gsub(v,'"', '\\"' ) .. '"'
elseif "number" == type( v ) then
return v
else
return "table" == type( v ) and table.tostring( v ) or
tostring( v )
end
end
-----------------------------------------------------------------------------
--- table key to string
--- @param table key
--- @return return table key format [ key ]
-----------------------------------------------------------------------------
function table.key_to_str ( k )
if "string" == type( k ) and string.match( k, "^[_%a][_%a%d]*$" ) then
return k
else
return "[" .. table.val_to_str( k ) .. "]"
end
end
-----------------------------------------------------------------------------
--- table to string
--- @param table
--- @return string
-----------------------------------------------------------------------------
function table.tostring( tbl )
local result, done = {}, {}
for k, v in ipairs( tbl ) do
table.insert( result, table.val_to_str( v ) )
done[ k ] = true
end
for k, v in pairs( tbl ) do
if not done[ k ] then
table.insert( result,
table.key_to_str( k ) .. "=" .. table.val_to_str( v ) )
end
end
return "{" .. table.concat( result, "," ) .. "}"
end
-----------------------------------------------------------------------------
--- Split the string based on pattern
--- @param string
--- @param pattern
--- @return table with all tokens
-----------------------------------------------------------------------------
function string.split (str, pattern)
pattern = pattern or "[^%s]+"
if pattern:len() == 0 then pattern = "[^%s]+" end
local parts = {__index = table.insert}
setmetatable(parts, parts)
str:gsub(pattern, parts)
setmetatable(parts, nil)
parts.__index = nil
return parts
end
-----------------------------------------------------------------------------
--- Check if string starts with given string
--- @param string to check
--- @param character set
--- @return true if string starts with the token
-----------------------------------------------------------------------------
function string.starts(String,Start)
return string.sub(String,1,string.len(Start))==Start
end
-----------------------------------------------------------------------------
--- Check if string ends with given string
--- @param string to check
--- @param character set
--- @return true if string ends with the token
-----------------------------------------------------------------------------
function string.ends(String,End)
return End=='' or string.sub(String,-string.len(End))==End
end
-----------------------------------------------------------------------------
--- String to the table : It calls loadstring and passes the string
-- @param table data
-- @return table
------------------------------------------------------------------------------
function string.table( data)
loadstring("local tmptable = {" .. data .. "}")
return tmptable;
end
------------------------------------------------------------------------------
--- Get command line optipo
-- @param args
-- @param options
------------------------------------------------------------------------------
function getopt( arg, options )
local tab = {}
for k, v in ipairs(arg) do
if string.sub( v, 1, 2) == "--" then
local x = string.find( v, "=", 1, true )
if x then tab[ string.sub( v, 3, x-1 ) ] = string.sub( v, x+1 )
else tab[ string.sub( v, 3 ) ] = true
end
elseif string.sub( v, 1, 1 ) == "-" then
local y = 2
local l = string.len(v)
local jopt
while ( y <= l ) do
jopt = string.sub( v, y, y )
if string.find( options, jopt, 1, true ) then
if y < l then
tab[ jopt ] = string.sub( v, y+1 )
y = l
else
tab[ jopt ] = arg[ k + 1 ]
end
else
tab[ jopt ] = true
end
y = y + 1
end
end
end
return tab
end
------------------------------------------------------------------------------
--- set the log level
-- @return host, port and task_file
------------------------------------------------------------------------------
function set_loglevel(logger, level)
if("debug" == level) then logger:setLevel (logging.DEBUG)
elseif("info" == level) then logger:setLevel (logging.INFO)
elseif("warn" == level) then logger:setLevel (logging.WARN)
elseif("error" == level) then logger:setLevel (logging.ERROR)
else logger:setLevel (logging.ERROR)
end
end
------------------------------------------------------------------------------
--- Get the number of cores
-- @return os windows, linux, mac
------------------------------------------------------------------------------
function get_num_cores()
local osname = os.getenv("OS")
if osname then
osname = string.lower(osname)
if string.find(osname, "window") or string.find(osname, "mingw") then
return tonumber(os.getenv("NUMBER_OF_PROCESSORS"))
end
end
-- FIXME get number of cores in linux/mac either by cat /proc/cpuinfo
return 2; --assume old dual core
end