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"""Module for easy access to portage's atom syntax """

import re

class gentooPackage(object):
    """A Gentoo package consists of:
       category
       name
       version
    of a Gentoo package"""

    def __init__(self, st):
        """An atom is initialized from an atom string"""
        if st[0] == '=': st = st[1:]
        slashparts = st.split("/")
        self.category = slashparts[0]
        minusparts = slashparts[1].split("-")
        self.ver = ""
        if len (minusparts) == 1:
            # No version given
            self.name=slashparts[1]
        else:
            # Parse the name-version part
            self.name=""
            while 1:
                p = minusparts.pop(0)
                # Try a number after a '-'
                if re.match('[0-9]+', p):
                    # Version starts here:
                    self.ver = "-".join([p] + minusparts)
                    break
                else:
                    # Append back to name
                    if self.name=="": self.name = p
                    else : self.name = "-".join([self.name, p])

    def packageName(self):
        """Returns the package name without category"""
        return self.name

    def packageVersion(self):
        """Returns the package version"""
        return self.ver

    def packageCategory(self):
        """Returns the package category without name"""
        return self.category

    def packageCatName(self):
        """Returns the package category and name without version"""
        return "/".join([self.category, self.name])

    def packageString(self):
        """ Returns a portage compatible string representation"""
        if self.ver == '':
            return  "/".join([self.category, self.name])
        else:
            return ( "=" + "/".join([self.category, "-".join([self.name, self.ver])]))