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Ruby method that builds XPath which finds fields within tables as labeled by the table headers
# Only works with column oriented tables
# Doesn't support colspan
def tabular_field(locator)
preceding_cells = 'count(ancestor::td[1]/preceding-sibling::td)'
preceding_headers = "count(ancestor::table[1]/thead/th[normalize-space(.) = '#{locator}']/preceding-sibling::th)"
".//input[#{preceding_cells} = #{preceding_headers}]"
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