# class Loader  to load any king of file
import wx
import string,numpy
class Load:
    """
        This class is loading values from given file or value giving by the user
    """
    
    def _init_(self,x=None,y=None,dx=None,dy=None):
        # variable to store loaded values
        self.x = x
        self.y = y
        self.dx = dx
        self.dy = dy
        self.filename = None
        
    def set_filename(self,path=None):
        """
            Store path into a variable.If the user doesn't give a path as a parameter a pop-up
            window appears to select the file.
            @param path: the path given by the user
        """
        self.filename = path
       

    def get_filename(self):
        """ return the file's path"""
        return self.filename
    
    def set_values(self):
        """ Store the values loaded from file in local variables """
        if not self.filename == None:
            input_f =  open(self.filename,'r')
            buff = input_f.read()
            lines = buff.split('\n')
            self.x=[]
            self.y=[]
            self.dx = [] 
            self.dy=[]
            for line in lines:
                try:
                    toks = line.split()
                    x = float(toks[0])
                    y = float(toks[1])
                    dy = float(toks[2])
                    
                    self.x.append(x)
                    self.y.append(y)
                    self.dy.append(dy)
                    self.dx = numpy.zeros(len(self.x))
                except:
                    print "READ ERROR", line
            
            
            # Sanity check
            if not len(self.x) == len(self.dx):
                raise ValueError, "x and dx have different length"
            if not len(self.y) == len(self.dy):
                raise ValueError, "y and dy have different length"
            
            
    def get_values(self):
        """ Return x, y, dx, dy """
        return self.x,self.y,self.dx,self.dy
    
    def load_data(self,data):
        """ Return plottable """
        #load data
        data.x = self.x
        data.y = self.y
        data.dx = self.dx
        data.dy =self.dy
        #Load its View class
        #plottable.reset_view()
       
    
if __name__ == "__main__": 
    load= Load()
    load.set_filename("testdata_line.txt")
    print load.get_filename() 
    load.set_values()
    print load.get_values()