Here is a function that generates tuples from the xml content:
def nodes_from_leo_xml(contents):
'''
Parses contents as xml Leo document and returns
a generator of the tuples
(parent_gnx, gnx, childIndex, h, b, ua, descendentUas)
suitable to be piped to the build_tree function.
'''
xroot = read_xml(contents)
v_elements = xroot.find('vnodes')
t_elements = xroot.find('tnodes')
bodies, uas = get_bodies_and_uas(t_elements)
heads = {}
def viter(parent_gnx, i, xv):
gnx = xv.attrib.get('t')
d_uas = xv.attrib.get('descendentVnodeUnknownAttributes')
d_uas = d_uas and resolve_ua('xxx', d_uas) # key is not important
here
h = heads.get(gnx)
if not h:
h = xv[0].text or ''
heads[gnx] = h
yield parent_gnx, gnx, i, h, bodies[gnx], uas[gnx], d_uas
for j, ch in enumerate(xv[1:]):
yield from viter(gnx, j, ch)
else:
yield parent_gnx, gnx, i, heads[gnx], bodies[gnx], uas[gnx],
d_uas
for i, xv in enumerate(v_elements):
yield from viter('hidden-root-vnode-gnx', i, xv)
Now all three paste commands: (paste-node, paste-retaining-clones and
paste-as-template) can reuse these functions. Each of them will use
nodes_from_leo_xml to generate tuples and then paste-node will reassign
on-the-fly all indices, paste-retaining-clones will pass the generated
tuples without change, and paste-as-template will change some of the
indices on-the-fly.
The next thing I am going to do is to write a function for generating
tuples from the external @file files. I hope this function can be used
inside nodes_from_leo_xml to include tuples from the @file files
on-the-fly. That way we would have a function to fully load Leo document
along with all the external files. The same need to be done with the
importers: create a function which generates tuples from the @auto files.
Handling the descendentVnodeUnknownAttributes will be the next goal after
all kinds of external files can generate tuples.
This is far from being production ready, but it shows great potential so
far.
Vitalije
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