def parse(str):
"""Parse a string into an XML document."""
from lib.easy.regex import grp, rep, opt, alt, matchone, matchall
id = '[A-Za-z_][A-Za-z0-9_:-]*'
string = alt('"[^"]*"', "'[^']*'")
ws = r'[\n\r\t ]*'
wsr = r'[\n\r\t ]+'
attr = grp(id, 'name') + ws + '=' + ws + grp(string, 'value')
attr_anon = id + ws + '=' + ws + string
tag = '<' + ws + grp(id, 'name') + alt(ws, wsr + grp(rep(attr_anon + ws, '+'), 'attrs')) + opt(grp('/', 'end')) + ws + '>'
tag_anon = '<' + ws + id + alt(ws, wsr + rep(attr_anon + ws, '+')) + opt('/') + ws + '>'
tagend = '<' + ws + '/' + ws + grp(id, 'name') + ws + '>'
tagend_anon = '<' + ws + '/' + ws + id + ws + '>'
declaration = '<[?!][^<>]+>'
data_elem = alt(grp('[^<&]+', 'char'), '&' + grp(rep('[a-z]', '+'), 'name') + ';')
data_elem_anon = alt('[^<&]+', '&' + rep('[a-z]', '+') + ';')
data = rep(data_elem_anon, '+')
handler = ParseHandler()
def parse_data(data):
def fn(match):
if 'char' in match:
return match['char']
else:
return _xml_entities[match['name']]
return ''.join(map(fn, matchall(data_elem, data)))
for i in matchall(alt(grp(tag_anon, 'tag'), grp(tagend_anon, 'tagend'), grp(data, 'data'), declaration), str):
# XML entities and declarations are ignored
if 'tag' in i:
match = matchone(tag, i['tag'])
attrs = { }
if 'attrs' in match:
for j in matchall(attr + ws, match['attrs']):
attrs[j['name']] = parse_data(j['value'][1:-1])
if 'end' in match:
handler.tag(match['name'], attrs)
else:
handler.tag_start(match['name'], attrs)
elif 'tagend' in i:
handler.tag_end(matchone(tagend, i['tagend'])['name'])
elif 'data' in i:
handler.data(parse_data(i['data']))
return handler.result
def parse_data(data): def fn(match): if 'char' in match: return match['char'] else: return _xml_entities[match['name']] return ''.join(map(fn, matchall(data_elem, data)))
