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mod flip;
mod reduce;
mod merge;
use std::fmt;
use crate::line::Line;
#[derive(Default, Clone)]
pub struct Context {
pub header: ContextHeader,
pub data: Vec<Line>,
}
impl Context {
pub fn pop_front(&mut self) -> Option<Line> {
self.remove(0)
}
pub fn pop_back(&mut self) -> Option<Line> {
self.remove(self.size()-1)
}
pub fn remove(&mut self, index: usize) -> Option<Line> {
if index > self.size() {
return None;
}
let line = self.data.remove(index);
if index == 0 {
self.header.file1_l += 1;
self.header.file2_l += 1;
}
match line {
Line::Context(_) => {
self.header.file1_s -= 1;
self.header.file2_s -= 1;
}
Line::Insert(_) => {
self.header.file2_s -= 1;
}
Line::Delete(_) => {
self.header.file1_s -= 1;
}
}
Some(line)
}
pub fn shift(&mut self, offset: isize) {
if offset > 0 {
self.header.file1_l += offset as usize;
}
if offset < 0 {
self.header.file1_l -= -offset as usize;
}
}
pub fn size(&self) -> usize {
self.data.len()
}
pub fn offset(&self) -> isize {
(self.header.file2_s as isize) - (self.header.file1_s as isize)
}
pub fn opening_context_size(&self) -> usize {
self.data.iter().take_while(|element| if let Line::Context(_) = element {
true
} else {
false
}).count()
}
pub fn closing_context_size(&self) -> usize {
self.data.iter().rev().take_while(|element| if let Line::Context(_) = element {
true
} else {
false
}).count()
}
pub fn has_changes(&self) -> bool {
for line in self.data.iter() {
match line {
Line::Context(_) => continue,
_ => return true,
}
}
false
}
pub fn update(&mut self) {
let mut s1 = 0;
let mut s2 = 0;
for line in self.data.iter() {
match line {
Line::Context(_) => {
s1 += 1;
s2 += 1;
},
Line::Insert(_) => s2 += 1,
Line::Delete(_) => s1 += 1,
}
}
self.header.file1_s = s1;
self.header.file2_s = s2;
}
}
impl fmt::Display for Context {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
writeln!(f, "{}", self.header)?;
for line in self.data.iter() {
writeln!(f, "{}", line)?;
}
Ok(())
}
}
#[derive(Default, Clone, Copy)]
pub struct ContextHeader {
pub file1_l: usize,
pub file1_s: usize,
pub file2_l: usize,
pub file2_s: usize,
}
impl fmt::Display for ContextHeader {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "@@ -{},{} +{},{} @@", self.file1_l, self.file1_s, self.file2_l, self.file2_s)
}
}