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62 lines
1.7 KiB
62 lines
1.7 KiB
from __future__ import unicode_literals
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__all__ = [
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'explode_text_fragments',
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]
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class _ExplodedList(list):
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"""
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Wrapper around a list, that marks it as 'exploded'.
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As soon as items are added or the list is extended, the new items are
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automatically exploded as well.
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"""
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def __init__(self, *a, **kw):
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super(_ExplodedList, self).__init__(*a, **kw)
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self.exploded = True
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def append(self, item):
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self.extend([item])
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def extend(self, lst):
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super(_ExplodedList, self).extend(explode_text_fragments(lst))
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def insert(self, index, item):
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raise NotImplementedError # TODO
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# TODO: When creating a copy() or [:], return also an _ExplodedList.
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def __setitem__(self, index, value):
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"""
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Ensure that when `(style_str, 'long string')` is set, the string will be
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exploded.
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"""
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if not isinstance(index, slice):
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index = slice(index, index + 1)
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value = explode_text_fragments([value])
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super(_ExplodedList, self).__setitem__(index, value)
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def explode_text_fragments(fragments):
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"""
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Turn a list of (style_str, text) tuples into another list where each string is
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exactly one character.
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It should be fine to call this function several times. Calling this on a
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list that is already exploded, is a null operation.
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:param fragments: List of (style, text) tuples.
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"""
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# When the fragments is already exploded, don't explode again.
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if getattr(fragments, 'exploded', False):
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return fragments
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result = []
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for style, string in fragments:
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for c in string:
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result.append((style, c))
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return _ExplodedList(result)
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