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from zope.interface import Interface
from zope.interface import Attribute
class ITALExpressionErrorInfo(Interface):
type = Attribute("type",
"The exception class.")
value = Attribute("value",
"The exception instance.")
lineno = Attribute("lineno",
"The line number the error occurred on in the source.")
offset = Attribute("offset",
"The character offset at which the error occurred.")
class ITALIterator(Interface): # pragma: no cover
"""A TAL iterator
Not to be confused with a Python iterator.
"""
def next():
"""Advance to the next value in the iteration, if possible
Return a true value if it was possible to advance and return
a false value otherwise.
"""
class ITALESIterator(ITALIterator): # pragma: no cover
"""TAL Iterator provided by TALES
Values of this iterator are assigned to items in the repeat namespace.
For example, with a TAL statement like: tal:repeat="item items",
an iterator will be assigned to "repeat/item". The iterator
provides a number of handy methods useful in writing TAL loops.
The results are undefined of calling any of the methods except
'length' before the first iteration.
"""
def index():
"""Return the position (starting with "0") within the iteration
"""
def number():
"""Return the position (starting with "1") within the iteration
"""
def even():
"""Return whether the current position is even
"""
def odd():
"""Return whether the current position is odd
"""
def parity():
"""Return 'odd' or 'even' depending on the position's parity
Useful for assigning CSS class names to table rows.
"""
def start():
"""Return whether the current position is the first position
"""
def end():
"""Return whether the current position is the last position
"""
def letter():
"""Return the position (starting with "a") within the iteration
"""
def Letter():
"""Return the position (starting with "A") within the iteration
"""
def roman():
"""Return the position (starting with "i") within the iteration
"""
def Roman():
"""Return the position (starting with "I") within the iteration
"""
def item():
"""Return the item at the current position
"""
def length():
"""Return the length of the sequence
Note that this may fail if the TAL iterator was created on a Python
iterator.
"""