Trait Sink

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pub trait Sink: Sized {
    type Out;

    // Required methods
    fn process_change(&mut self, before: Range<u32>, after: Range<u32>);
    fn finish(self) -> Self::Out;

    // Provided method
    fn with_counter(self) -> Counter<Self> { ... }
}

Available on crate feature blob only.

Expand description

Trait for processing the edit-scripts computed with diff

Required Associated Types§

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type Out

Required Methods§

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fn process_change(&mut self, before: Range<u32>, after: Range<u32>)

This method is called whenever a diff algorithm finds a change between the two processed input file. A change is a continous subsequence of tokens before that needs to be replaced by a different contious subsequence of tokens after to construct the seconds file from the first.

These token subsequences are passed to this function in in ** strictly montonically increasing order**. That means that for two subsequenct calls process_change(before1, after1) and process_change(before2, after2) the following always holds:

assert!(before1.end < before2.start);
assert!(after1.end < after2.start);

§Paramters

before - the position of the removed token subsequence in the orignal file.
after - the position of the inserted token subsequence in the destination file.

§Notes

A Sink has no function to indicate that a section of a file remains unchanged. However due to the montonically increasing calls, implementations can easily determine which subsequences remain unchanged by saving before.end/after.end. The range between before.start/after.end and the previous before.end/after.end is always unchanged.

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