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smarter match finding

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This commit is contained in:
Frederik Palmø 2021-10-24 14:18:41 +02:00
parent 4bcd7a2801
commit 066d927f3b
5 changed files with 125 additions and 41 deletions
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36
.vscode/launch.json vendored Normal file
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@ -0,0 +1,36 @@
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"type": "lldb",
"request": "launch",
"name": "Debug executable 'eyes'",
"cargo": {
"args": ["build", "--bin=eyes", "--package=eyes"],
"filter": {
"name": "eyes",
"kind": "bin"
}
},
"args": [],
"cwd": "${workspaceFolder}"
},
{
"type": "lldb",
"request": "launch",
"name": "Debug unit tests in executable 'eyes'",
"cargo": {
"args": ["test", "--no-run", "--bin=eyes", "--package=eyes"],
"filter": {
"name": "eyes",
"kind": "bin"
}
},
"args": [],
"cwd": "${workspaceFolder}"
}
]
}

1
Cargo.toml
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@ -2,5 +2,6 @@
name = "eyes"
version = "0.1.0"
edition = "2018"
license-file="LICENSE.txt"
[dependencies]

0
LICENSE → LICENSE.txt
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109
src/lib.rs
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@ -1,30 +1,42 @@
pub struct Parser<'a> {
_input: &'a str,
_pattern: &'a str,
captures: Vec<&'a str>,
}
impl<'a> Parser<'a> {
pub fn new(input: &'a str, pattern: &'a str) -> Self {
let splits = pattern
pub fn new(input: &'a str, template: &'a str) -> Self {
let patterns = template
.split("{}")
.filter(|pat| pat != &"")
.collect::<Vec<_>>();
let mut captures = vec![input];
for pat in splits {
captures = captures
.iter()
.map(|sub| sub.split(pat))
.flatten()
.collect();
for (i, pat) in patterns.iter().enumerate() {
let last = captures.pop().unwrap();
let (mut left, mut right) = last.split_once(pat).unwrap();
// if the right side of the split doesn't contain the pattern,
// we don't have to check if we can expand the match
if right.contains(pat) {
let mut pattern_index = right.find(pat).unwrap() + left.len();
let next_pattern_index = right.find(patterns[i + 1]).unwrap() + left.len();
while next_pattern_index > pattern_index {
let (left_side, _) = input.split_at(pattern_index + 1);
left = left_side;
let (_, right_side) = input.split_at(pattern_index + 1 + pat.len());
right = right_side;
pattern_index = right.find(pat).unwrap_or(input.len()) + left.len();
}
}
Self {
_input: input,
_pattern: pattern,
captures: captures[1..].to_vec(),
if !left.is_empty() {
captures.push(left);
}
captures.push(right);
}
Self { captures }
}
pub fn captures(&self) -> Vec<&'a str> {
@ -36,15 +48,11 @@ impl<'a> Parser<'a> {
macro_rules! parse {
($input: expr, $pattern: tt, $($type:ty),*) => {
{
let mut parser = eyes::Parser::new($input, $pattern);
let mut captures = parser.captures();
captures.reverse();
let parser = $crate::Parser::new($input, $pattern);
let captures = parser.captures();
let mut iter = captures.iter();
(
$({
captures.pop().unwrap().parse::<$type>().unwrap()
},)*
)
($(iter.next().unwrap().parse::<$type>().unwrap()),*)
}
};
}
@ -53,15 +61,56 @@ macro_rules! parse {
macro_rules! try_parse {
($input: expr, $pattern: tt, $($type:ty),*) => {
{
let mut parser = eyes::Parser::new($input, $pattern);
let mut captures = parser.captures();
captures.reverse();
let parser = $crate::Parser::new($input, $pattern);
let captures = parser.captures();
let mut iter = captures.iter();
(
$({
captures.pop().unwrap().parse::<$type>()
},)*
)
($(iter.next().unwrap().parse::<$type>()),*)
}
};
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn simple_test() {
// Test where the patterns in the template are all different
let input = "#lol @ 338,7643: 20.2x24.5";
let template = "#{} @ {},{}: {}x{}";
println!("input: '{}'", input);
println!("pattern: '{}'", template);
let (id, x, y, w, h) = parse!(input, template, String, isize, isize, f64, f64);
println!("id: {:?}", id);
println!("x: {:?}", x);
println!("y: {:?}", y);
println!("w: {:?}", w);
println!("h: {:?}", h);
assert_eq!((id.as_str(), x, y, w, h), ("lol", 338, 7643, 20.2, 24.5));
}
#[test]
fn tries_to_expand_correctly() {
let input = "turn off 660,55 through 986,197";
let template = "{} {},{} through {},{}";
println!("input: '{}'", input);
println!("pattern: '{}'", template);
let (op, x1, y1, x2, y2) = try_parse!(input, template, String, usize, usize, usize, usize);
println!("op: {:?}", op);
println!("p1: {:?}", (&x1, &y1));
println!("p2: {:?}", (&x2, &y2));
assert_eq!(
(op.unwrap().as_str(), x1, y1, x2, y2),
("turn off", Ok(660), Ok(55), Ok(986), Ok(197))
);
}
}

18
src/main.rs
View file

@ -1,17 +1,15 @@
use eyes::*;
fn main() {
let input = "#loll1 @ 338,764: 20x24";
let pattern = "#{} @ {},{}: {}x{}";
let input = "turn off 660,55 through 986,197";
let template = "{} {},{} through {},{}";
println!("input: {}", input);
println!("pattern: {}", pattern);
println!("input: '{}'", input);
println!("pattern: '{}'", template);
let (id, x, y, w, h) = parse!(input, pattern, String, f64, f32, usize, isize);
let (op, x1, y1, x2, y2) = try_parse!(input, template, String, usize, usize, usize, usize);
println!("id: {:?}", id);
println!("x: {:?}", x);
println!("y: {:?}", y);
println!("w: {:?}", w);
println!("h: {:?}", h);
println!("op: {:?}", op);
println!("p1: {:?}", (x1, y1));
println!("p2: {:?}", (x2, y2));
}