#! /usr/bin/env python
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# Revision $Id: stack_manifest.py 6490 2009-10-12 21:26:50Z kwc $
# $Author: kwc $

"""
Python parser for rospack stack.xml files. See U{http://pr.willowgarage.com/wiki/Stack%20Manifest}
"""

import sys
import os
import getopt

import roslib.exceptions
import roslib.packages
import roslib.rosenv

STACK_FILE = 'stack.xml'

import roslib.manifestlib
# re-export symbols so that external code does not have to import manifestlib as well
from roslib.manifestlib import ManifestException, StackDepend

class StackManifest(roslib.manifestlib._Manifest):
    """
    Object representation of a ROS manifest file
    """
    __slots__ = []
    def __init__(self):
        """
        Create an empty stack manifest instance.
        """
        super(StackManifest, self).__init__('stack')
        
def _stack_file_by_dir(stack_dir, required=True):
    """
    @param stack_dir: path to stack directory
    @type  stack_dir: str
    @param required: require that the directory exist
    @type  required: bool
    @return: path to manifest file of stack
    @rtype: str
    @raise InvalidROSPkgException: if required is True and manifest file cannot be located
    """
    try:
        p = os.path.join(stack_dir, STACK_FILE)
        if not required and not os.path.exists(p):
            return p
        if not os.path.isfile(p):
            raise roslib.stacks.InvalidROSStackException("""
Stack '%(stack_dir)s' is improperly configured: no manifest file is present.
"""%locals())
        return p
    except roslib.stacks.InvalidROSStackException, e:
        if required:
            raise

def stack_file(stack, required=True):
    """
    @param stack: stack name
    @type  stack: str
    @param required: require that the directory exist
    @type  required: bool
    @return: path to manifest file of stack
    @rtype:  str
    @raise InvalidROSPkgException: if required is True and manifest file cannot be located
    """
    d = roslib.stacks.get_stack_dir(stack)
    return _stack_file_by_dir(d, required)
        
def parse_file(file):
    """
    Parse stack.xml file
    @param file: stack.xml file path
    @param file: str
    @return: StackManifest instance
    @rtype:  L{StackManifest}
    """
    return roslib.manifestlib.parse_file(StackManifest(), file)

def parse(string, filename='string'):
    """
    Parse stack.xml string contents
    @param string: stack.xml contents
    @type  string: str
    @return: StackManifest instance
    @rtype:  L{StackManifest}
    """
    s = roslib.manifestlib.parse(StackManifest(), string, filename)
    #TODO: validate
    return s
