import grp, os, pwd
from point2 import Point

def resolve_token(w):
    c = w.logical_cursor()
    p = Point(0, c.y)
    return w.get_next_token_by_type(p, 'name')
def resolve_name(w):
    t = resolve_token(w)
    return t.string
def resolve_path(w):
    name = resolve_name(w)
    path = os.path.join(w.buffer.path, name)
    return path

def find_name(w, s):
    found = False
    w.goto(Point(0, 0))
    c = w.logical_cursor()
    while not found and c.y < len(w.buffer.lines):
        t = resolve_token(w)
        if t.string == s:
            found = True
            break
        w.goto(Point(c.x, c.y + 1))
        c = w.logical_cursor()
    if not found:
        w.goto(Point(0, 0))

def valid_owner(owner):
    if not owner:
        return False
    elif owner.isdigit():
        return True
    try:
        pwd.getpwnam(owner)
        return True
    except:
        return False
def valid_group(group):
    if not group:
        return False
    elif group.isdigit():
        return True
    try:
        grp.getgrnam(group)
        return True
    except:
        return False