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| +This example shows how to write a lazy transformer.
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| +
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| +This lazy tranformer implements a ROT13 converter. ROT13 (ROTate 13)
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| +is a classic substitution cipher which replaces each letter in the source
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| +file with the corresponding letter 13 places later in the alphabet.
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| +The source file should have a ".txt" extension and the converted file
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| +is created with a ".shhhh" extension.
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| +
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| +Generally, only transformers that take a long time to run should be made lazy.
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| +This transformer is not particularly slow, but imagine that it might be used
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| +to convert the entire library of congress–laziness would then be a virtue.
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| +
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| +For more information, see Writing a Lazy Transformer at:
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| +https://www.dartlang.org/tools/pub/transformers/lazy-transformer.html
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