85 lines
2.5 KiB
Python
85 lines
2.5 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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"""A `graph` must have `string` attribute and an immediate node of `graph` view must be `field`."""
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if arch.xpath('//graph[not (@string)]'):
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return False
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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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"""A `tree` must have `string` attribute and an immediate node of `tree` view must be `field` or `button`."""
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if arch.xpath('//tree[not (@string)]'):
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return False
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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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"""A `name` attribute must be in a `field` node."""
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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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"""A `for` and `string` attribute must be on a `label` node."""
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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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