X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/bae9e47884fdc3fc1a81fb4844572a832fcfb2ce..ab7f9b241429bd675b437d2437799de75d2f409b:/workspace/src/part13.rs?ds=sidebyside

diff --git a/workspace/src/part13.rs b/workspace/src/part13.rs
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-// Rust-101, Part 13: Slices, Arrays, External Dependencies
-// =================
-
-
-// ## Slices
-pub fn sort<T: PartialOrd>(data: &mut [T]) {
-    if data.len() < 2 { return; }
-
-    // We decide that the element at 0 is our pivot, and then we move our cursors through the rest of the slice,
-    // making sure that everything on the left is no larger than the pivot, and everything on the right is no smaller.
-    let mut lpos = 1;
-    let mut rpos = data.len();
-    /* Invariant: pivot is data[0]; everything with index (0,lpos) is <= pivot; [rpos,len) is >= pivot; lpos < rpos */
-    loop {
-        // **Exercise 13.1**: Complete this Quicksort loop. You can use `swap` on slices to swap two elements.
-        unimplemented!()
-    }
-
-    // Once our cursors met, we need to put the pivot in the right place.
-    data.swap(0, lpos-1);
-
-    // Finally, we split our slice to sort the two halves. The nice part about slices is that splitting them is cheap:
-    let (part1, part2) = data.split_at_mut(lpos);
-    unimplemented!()
-}
-
-// **Exercise 13.2*: Since `String` implements `PartialEq`, you can now change the function `output_lines` in the previous part
-// to call the sort function above. If you did exercise 12.1, you will have slightly more work. Make sure you sort by the matched line
-// only, not by filename or line number!
-
-// Now, we can sort, e.g., an vector of numbers.
-fn sort_nums(data: &mut Vec<i32>) {
-    sort(&mut data[..]);
-}
-
-// ## Arrays
-fn sort_array() {
-    let mut data: [f64; 5] = [1.0, 3.4, 12.7, -9.12, 0.1];
-    sort(&mut data);
-}
-
-// ## External Dependencies
-
-
-// I disabled the following module (using a rather bad hack), because it only compiles if `docopt` is linked. However, before enabling it,
-// you still have get the external library into the global namespace. This is done with `extern crate docopt;`, and that statement *has* to be
-// in `main.rs`. So please go there, and enable this commented-out line. Then remove the attribute of the following module.
-#[cfg(feature = "disabled")]
-pub mod rgrep {
-    // Now that `docopt` is linked and declared in `main.rs`, we can import it with `use`. We also import some other pieces that we will need.
-    use docopt::Docopt;
-    use part12::{run, Options, OutputMode};
-    use std::process;
-
-    // The USAGE string documents how the program is to be called. It's written in a format that `docopt` can parse.
-    static USAGE: &'static str = "
-Usage: rgrep [-c] [-s] <pattern> <file>...
-
-Options:
-    -c, --count  Count number of matching lines (rather than printing them).
-    -s, --sort   Sort the lines before printing.
-";
-
-    // This function extracts the rgrep options from the command-line arguments.
-    fn get_options() -> Options {
-        // Parse argv and exit the program with an error message if it fails. This is taken from the [`docopt` documentation](http://burntsushi.net/rustdoc/docopt/).
-        let args = Docopt::new(USAGE).and_then(|d| d.parse()).unwrap_or_else(|e| e.exit());
-        // Now we can get all the values out.
-        let count = args.get_bool("-c");
-        let sort = args.get_bool("-s");
-        let pattern = args.get_str("<pattern>");
-        let files = args.get_vec("<file>");
-        if count && sort {
-            println!("Setting both '-c' and '-s' at the same time does not make any sense.");
-            process::exit(1);
-        }
-
-        // We need to make the strings owned to construct the `Options` instance.
-        Options {
-            files: files.iter().map(|file| file.to_string()).collect(),
-            pattern: pattern.to_string(),
-            output_mode: if count { OutputMode::Count } else if sort { OutputMode::SortAndPrint } else { OutputMode::Print },
-        }
-    }
-
-    // Finally, we can call the `run` function from the previous part on the options extracted using `get_options`. Edit `main.rs` to call this function.
-    // You can now use `cargo run -- <pattern> <files>` to call your program, and see the argument parser and the threads we wrote previously in action!
-    pub fn main() {
-        run(get_options());
-    }
-}
-
-// **Exercise 13.3**: Wouldn't it be nice if rgrep supported regular expressions? There's already a crate that does all the parsing and matching on regular
-// expression, it's called [regex](https://crates.io/crates/regex). Add this crate to the dependencies of your workspace, add an option ("-r") to switch
-// the pattern to regular-expression mode, and change `filter_lines` to honor this option. The documentation of regex is available from its crates.io site.
-