81 lines
2.2 KiB
Python
81 lines
2.2 KiB
Python
""" View validation code (using assertions, not the RNG schema). """
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import logging
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_logger = logging.getLogger(__name__)
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def valid_page_in_book(arch):
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"""A `page` node must be below a `book` node."""
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return not arch.xpath('//page[not(ancestor::notebook)]')
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def valid_field_in_graph(arch):
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""" Children of ``graph`` can only be ``field`` """
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for child in arch.xpath('/graph/child::*'):
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if child.tag != 'field':
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return False
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return True
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def valid_field_in_tree(arch):
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""" Children of ``tree`` view must be ``field`` or ``button``."""
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for child in arch.xpath('/tree/child::*'):
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if child.tag not in ('field', 'button'):
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return False
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return True
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def valid_att_in_field(arch):
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""" ``field`` nodes must all have a ``@name`` """
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return not arch.xpath('//field[not(@name)]')
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def valid_att_in_label(arch):
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""" ``label`` nodes must have a ``@for`` or a ``@string`` """
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return not arch.xpath('//label[not(@for or @string)]')
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def valid_att_in_form(arch):
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return True
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def valid_type_in_colspan(arch):
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"""A `colspan` attribute must be an `integer` type."""
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for attrib in arch.xpath('//*/@colspan'):
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try:
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int(attrib)
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except:
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return False
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return True
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def valid_type_in_col(arch):
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"""A `col` attribute must be an `integer` type."""
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for attrib in arch.xpath('//*/@col'):
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try:
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int(attrib)
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except:
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return False
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return True
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def valid_view(arch):
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if arch.tag == 'form':
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for pred in [valid_page_in_book, valid_att_in_form, valid_type_in_colspan,
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valid_type_in_col, valid_att_in_field, valid_att_in_label]:
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if not pred(arch):
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_logger.error('Invalid XML: %s', pred.__doc__)
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return False
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elif arch.tag == 'graph':
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for pred in [valid_field_in_graph, valid_att_in_field]:
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if not pred(arch):
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_logger.error('Invalid XML: %s', pred.__doc__)
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return False
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elif arch.tag == 'tree':
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for pred in [valid_field_in_tree, valid_att_in_field]:
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if not pred(arch):
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_logger.error('Invalid XML: %s', pred.__doc__)
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return False
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return True
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