112 lines
2.5 KiB
Rust
112 lines
2.5 KiB
Rust
use crate::algorithms::hook::DiffHook;
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use std::convert::Infallible;
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/// Utility enum to capture a diff operation.
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///
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/// This is used by [`Capture`](crate::algorithms::Capture).
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#[derive(Debug, PartialEq, Eq, Hash, Clone, Copy)]
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pub enum DiffOp {
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/// A segment is equal (see [`DiffHook::equal`])
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Equal {
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old_index: usize,
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new_index: usize,
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len: usize,
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},
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/// A segment was deleted (see [`DiffHook::delete`])
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Delete {
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old_index: usize,
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old_len: usize,
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new_index: usize,
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},
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/// A segment was inserted (see [`DiffHook::insert`])
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Insert {
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old_index: usize,
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new_index: usize,
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new_len: usize,
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},
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/// A segment was replaced (see [`DiffHook::replace`])
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Replace {
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old_index: usize,
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old_len: usize,
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new_index: usize,
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new_len: usize,
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},
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}
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/// A [`DiffHook`] that captures all diff operations.
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#[derive(Default, Clone)]
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pub struct Capture(Vec<DiffOp>);
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impl Capture {
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/// Creates a new capture hook.
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pub fn new() -> Capture {
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Capture::default()
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}
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/// Converts the capture hook into a vector.
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pub fn into_vec(self) -> Vec<DiffOp> {
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self.0
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}
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/// Accesses the captured operations.
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pub fn ops(&self) -> &[DiffOp] {
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&self.0
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}
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}
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impl DiffHook for Capture {
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type Error = Infallible;
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fn equal(&mut self, old_index: usize, new_index: usize, len: usize) -> Result<(), Self::Error> {
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self.0.push(DiffOp::Equal {
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old_index,
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new_index,
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len,
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});
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Ok(())
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}
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fn delete(
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&mut self,
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old_index: usize,
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old_len: usize,
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new_index: usize,
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) -> Result<(), Self::Error> {
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self.0.push(DiffOp::Delete {
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old_index,
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old_len,
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new_index,
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});
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Ok(())
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}
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fn insert(
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&mut self,
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old_index: usize,
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new_index: usize,
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new_len: usize,
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) -> Result<(), Self::Error> {
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self.0.push(DiffOp::Insert {
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old_index,
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new_index,
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new_len,
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});
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Ok(())
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}
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fn replace(
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&mut self,
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old_index: usize,
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old_len: usize,
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new_index: usize,
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new_len: usize,
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) -> Result<(), Self::Error> {
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self.0.push(DiffOp::Replace {
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old_index,
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old_len,
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new_index,
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new_len,
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});
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Ok(())
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}
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}
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