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86
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aaronmk
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# XML "function" nodes that evaluate their contents to text
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111
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aaronmk
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import datetime
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300
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aaronmk
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import exc
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86
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aaronmk
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import xml_dom
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280
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aaronmk
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class SyntaxException(Exception):
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def __init__(self, cause=None):
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288
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aaronmk
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Exception.__init__(self, 'Invalid syntax in XML function: '+str(cause))
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278
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aaronmk
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86
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aaronmk
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def map_items(func, items):
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return [(name, func(value)) for name, value in items]
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278
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aaronmk
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def conv_items(type_, items):
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try: return map_items(type_, items)
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except ValueError, e: raise SyntaxException(e)
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113
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aaronmk
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def alt(items):
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items = list(items)
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items.sort()
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return items[0][1] # value of lowest-numbered item
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86
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aaronmk
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def range_(items):
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278
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aaronmk
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items = dict(conv_items(float, items))
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326
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aaronmk
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try:
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to = items['to']
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from_ = items['from']
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except KeyError, e: raise SyntaxException(e)
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return str(to - from_)
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86
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aaronmk
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def avg(items):
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count = 0
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sum_ = 0.
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278
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aaronmk
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for name, value in conv_items(float, items):
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86
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aaronmk
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count += 1
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sum_ += value
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return str(sum_/count)
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def date(items):
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items = dict(items)
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287
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aaronmk
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if 'date' in items:
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str_ = items['date']
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324
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aaronmk
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try: year = float(str_)
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except ValueError:
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try: import dateutil.parser
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except ImportError: return str_
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try: date = dateutil.parser.parse(str_)
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except ValueError, e: raise SyntaxException(e)
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else: date = (datetime.date(int(year), 1, 1) +
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datetime.timedelta(round((year % 1.)*365)))
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287
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aaronmk
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else:
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778
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aaronmk
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def get_part(part, default=1):
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val = items.get(part, default)
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if val == 0: val = default
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return val
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year = get_part('year', 1900)
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month = get_part('month')
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day = get_part('day')
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287
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aaronmk
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try:
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324
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aaronmk
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year = int(year)
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287
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aaronmk
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month = int(month)
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day = int(day)
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720
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aaronmk
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date = datetime.date(year, month, day)
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287
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aaronmk
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except ValueError, e: raise SyntaxException(e)
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721
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aaronmk
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try: return date.strftime('%Y-%m-%d')
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except ValueError, e: raise SyntaxException(e)
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86
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aaronmk
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328
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aaronmk
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_name_parts_slices_items = [
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('first', slice(None, 1)),
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('middle', slice(1, -1)),
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('last', slice(-1, None)),
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]
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name_parts_slices = dict(_name_parts_slices_items)
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name_parts = [name for name, slice_ in _name_parts_slices_items]
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89
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aaronmk
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def name(items):
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items = dict(items)
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102
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aaronmk
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parts = []
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328
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aaronmk
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for part in name_parts:
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if part in items: parts.append(items[part])
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102
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aaronmk
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return ' '.join(parts)
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328
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aaronmk
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def name_part(items):
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out_items = []
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for part, value in items:
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try: slice_ = name_parts_slices[part]
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except KeyError, e: raise SyntaxException(e)
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else: out_items.append((part, ' '.join(value.split(' ')[slice_])))
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return name(out_items)
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86
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aaronmk
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# Function names must start with _ to avoid collisions with real tags
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144
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aaronmk
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# Functions take arguments (items)
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113
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aaronmk
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funcs = {'_alt': alt, '_range': range_, '_avg': avg, '_date': date,
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328
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aaronmk
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'_name': name, '_namePart': name_part}
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86
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aaronmk
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447
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aaronmk
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def process(node, on_error=exc.raise_):
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457
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aaronmk
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for child in xml_dom.NodeElemIter(node): process(child, on_error)
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139
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aaronmk
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name = node.tagName
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280
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aaronmk
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if name.startswith('_') and name in funcs:
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try: value = funcs[name](xml_dom.NodeTextEntryIter(node))
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288
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aaronmk
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except SyntaxException, e:
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448
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aaronmk
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str_ = str(node)
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exc.add_msg(e, 'function:\n'+str_)
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xml_dom.replace(node, node.ownerDocument.createComment('\n'+str_))
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447
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aaronmk
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on_error(e)
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280
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aaronmk
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else: xml_dom.replace_with_text(node, value)
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