source: nappy/trunk/nappy/na_file/na_file_2310.py @ 3414

#   Copyright (C) 2004 CCLRC & NERC( Natural Environment Research Council ).
#   This software may be distributed under the terms of the
#   Q Public License, version 1.0 or later. http://ndg.nerc.ac.uk/public_docs/QPublic_license.txt

"""
naFile2310.py
=============

Container module for NAFile2310 class.

"""

# Imports from python standard library

# Imports from local package
import nappy.utils.text_parser
import nappy.na_file.na_file_2110

class NAFile2310(nappy.na_file.na_file_2110.NAFile2110):
    """
    Class to read, write and interact with NASA Ames files conforming to the
    File Format Index (FFI) 2310.
    """

    def readHeader(self):
        """
        Reads FFI-specifc header section.
        """        
        self._normalized_X = False
        self._readCommonHeader()
        self.DX = nappy.utils.text_parser.readItemsFromLine(self.file.readline(), 1, float)
        self.XNAME = nappy.utils.text_parser.readItemsFromLines(self._readLines(self.NIV), self.NIV, str)
        self.XNAME.reverse()  # Reverse because C-type array is least-changing first          
        self._readVariablesHeaderSection()
        self._readAuxVariablesHeaderSection()
        self._readComments()

    def writeHeader(self):
        """
        Writes FFI-specifc header section.
        """
        self._writeCommonHeader()
        #self.DX.reverse()
        self.header.write(("%s\n") % self.DX[0])
        self.XNAME.reverse()
        self.header.write("%s\n" * self.NIV % tuple(self.XNAME))
        self._writeVariablesHeaderSection()
        self._writeAuxVariablesHeaderSection()
        self._writeComments()
        self._fixHeaderLength()
        self.file.write(self.header.read())

    def _readData1(self, datalines, ivar_count):
        """
        Reads first line/section of current block of data.
        """        
        # Start with independent and Auxilliary vars
        (x_and_a, rtlines) = nappy.utils.text_parser.readItemsFromUnknownLines(datalines, self.NAUXV + 1, float)
        (x, aux) = (x_and_a[0], x_and_a[1:])

        count = 0
        for a in range(self.NAUXV):
            self.A[a].append(aux[count])
            count = count + 1

        self.X.append([])
        self.X[ivar_count].append(x)

        # Set up list to take second changing independent variable
        self.X[ivar_count].append([aux[1]])
        self.NX.append(int(aux[0]))
        self.DX.append(int(aux[2]))
        return rtlines
   
    def _readData2(self, datalines, ivar_count):
        """
        Reads second line/section (if used) of current block of data.
        """
        # Now get the dependent variables
        (v, rtlines) = nappy.utils.text_parser.readItemsFromUnknownLines(datalines, self.NV * self.NX[ivar_count], float)
        count = 0
        for n in range(self.NV):
            self.V[n].append([])
            for i in range(self.NX[ivar_count]):
                self.V[n][ivar_count].append(v[count])
                count = count + 1
        return rtlines

    def writeData(self):
        """
        Writes the data section of the file.
        This method can be called directly by the user.
        """
        # Set up unbounded IV loop
        # self.NX.reverse()

        for m in range(len(self.X)):
            # Write Independent variable mark and auxiliary variables
            var_string = "%s    " % self.X[m][0]
            for a in range(self.NAUXV):
                var_string = var_string + ("%s    " % self.A[a][m])
            self.file.write("%s\n" % var_string.rstrip())

            # Write second independant variable and dependant variables
            var_string = ""
            for p in range(self.NX[m]):
                for n in range(self.NV):
                    var_string = var_string + ("%s    " %self.V[n][m][p])

            self.file.write("%s    \n" %var_string)