"""
BitBake Parsers

File parsers for the BitBake build tools.

"""


# Copyright (C) 2003, 2004  Chris Larson
# Copyright (C) 2003, 2004  Phil Blundell
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Based on functions from the base bb module, Copyright 2003 Holger Schurig

__all__ = [ 'ParseError', 'SkipPackage', 'cached_mtime', 'mark_dependency',
            'supports', 'handle', 'init' ]
handlers = []

import bb, os

class ParseError(Exception):
    """Exception raised when parsing fails"""

class SkipPackage(Exception):
    """Exception raised to skip this package"""

__mtime_cache = {}
def cached_mtime(f):
    if not __mtime_cache.has_key(f):
        __mtime_cache[f] = os.stat(f)[8]
    return __mtime_cache[f]

def cached_mtime_noerror(f):
    if not __mtime_cache.has_key(f):
        try:
            __mtime_cache[f] = os.stat(f)[8]
        except OSError:
            return 0
    return __mtime_cache[f]

def update_mtime(f):
    __mtime_cache[f] = os.stat(f)[8]
    return __mtime_cache[f]

def mark_dependency(d, f):
    if f.startswith('./'):
        f = "%s/%s" % (os.getcwd(), f[2:])
    deps = bb.data.getVar('__depends', d) or []
    deps.append( (f, cached_mtime(f)) )
    bb.data.setVar('__depends', deps, d)

def supports(fn, data):
    """Returns true if we have a handler for this file, false otherwise"""
    for h in handlers:
        if h['supports'](fn, data):
            return 1
    return 0

def handle(fn, data, include = 0, statements = None):
    """Call the handler that is appropriate for this file"""
    if not statements:
        import ast
        statements = ast.StatementGroup()

    for h in handlers:
        if h['supports'](fn, data):
            return h['handle'](fn, data, include, statements)
    raise ParseError("%s is not a BitBake file" % fn)

def init(fn, data):
    for h in handlers:
        if h['supports'](fn):
            return h['init'](data)

def resolve_file(fn, d):
    if not os.path.isabs(fn):
        f = None
        bbpath = (bb.data.getVar('BBPATH', d, 1) or '').split(':')
        for p in bbpath:
            j = os.path.join(p, fn)
            if os.access(j, os.R_OK):
                abs_fn = j
                f = open(j, 'r')
                break
        if f is None:
            raise IOError("file %s not found" % fn)
    else:
        f = open(fn,'r')
        abs_fn = fn

    bb.msg.debug(2, bb.msg.domain.Parsing, "LOAD %s" % abs_fn)
    return (f, abs_fn)


from bb.parse.parse_py import __version__, ConfHandler, BBHandler