mirror of https://github.com/rust-lang/book
56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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extern crate regex;
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use std::io;
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use std::io::{Read, Write};
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use regex::{Regex, Captures};
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use std::collections::HashSet;
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fn main () {
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let mut buffer = String::new();
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if let Err(e) = io::stdin().read_to_string(&mut buffer) {
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panic!(e);
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}
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let mut refs = HashSet::new();
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// capture all links and link references
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let regex = r"\[([^\]]+)\](?:(?:\[([^\]]+)\])|(?:\([^\)]+\)))(?i)<!-- ignore -->";
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let link_regex = Regex::new(regex).unwrap();
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let first_pass = link_regex.replace_all(&buffer, |caps: &Captures| {
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// save the link reference we want to delete
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if let Some(reference) = caps.at(2) {
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refs.insert(reference.to_owned());
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}
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// put the link title back
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caps.at(1).unwrap().to_owned()
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});
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// search for the references we need to delete
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let ref_regex = Regex::new(r"\n\[([^\]]+)\]:\s.*\n").unwrap();
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let out = ref_regex.replace_all(&first_pass, |caps: &Captures| {
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let capture = caps.at(1).unwrap().to_owned();
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// check if we've marked this reference for deletion...
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if refs.contains(capture.as_str()) {
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return "".to_string();
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}
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//... else we put back everything we captured
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caps.at(0).unwrap().to_owned()
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});
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write!(io::stdout(), "{}", out).unwrap();
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}
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