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Merge remote-tracking branch 'origin/pr/197'

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Carol (Nichols || Goulding) 2016-08-18 09:38:25 -04:00
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src/bin/link2print.rs Normal file
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extern crate regex;
use std::collections::HashMap;
use std::io;
use std::io::{Read, Write};
use regex::{Regex, Captures};
fn main() {
write_md(parse_links(parse_references(read_md())));
}
fn read_md() -> String {
let mut buffer = String::new();
match io::stdin().read_to_string(&mut buffer) {
Ok(_) => buffer,
Err(error) => panic!(error),
}
}
fn write_md(output: String) {
write!(io::stdout(), "{}", output).unwrap();
}
fn parse_references(buffer: String) -> (String, HashMap<String, String>) {
let mut ref_map = HashMap::new();
// TODO: Currently doesn't handle "title" in following line
let re = Regex::new(r###"(?m)\n?^ {0,3}\[([^]]+)\]:[[:blank:]]*(.*)$"###).unwrap();
let output = re.replace_all(&buffer, |caps: &Captures| {
let key = caps.at(1).unwrap().to_owned().to_uppercase();
let val = caps.at(2).unwrap().to_owned();
if ref_map.insert(key, val).is_some() {
panic!("Did not expect markdown page to have duplicate reference");
}
"".to_string()
});
(output, ref_map)
}
fn parse_links((buffer, ref_map): (String, HashMap<String, String>)) -> String {
// TODO: check which punctuation is allowed by spec
let re = Regex::new(r###"(?:(?P<pre>(?:```(?:[^`]|`[^`])*`?\n```\n)|(?:[^[]`[^`\n]+[\n]?[^`\n]*`))|(?:\[(?P<name>[^]]+)\](?:(?:\([[:blank:]]*(?P<val>[^")]*[^ ])(?:[[:blank:]]*"[^"]*")?\))|(?:\[(?P<key>[^]]*)\]))?))"###).unwrap();
let output = re.replace_all(&buffer, |caps: &Captures| {
match caps.name("pre") {
Some(pre_section) => format!("{}", pre_section.to_owned()),
None => {
let name = caps.name("name").unwrap().to_owned();
let val = match caps.name("val") {
// [name](link)
Some(value) => value.to_owned(),
None => {
match caps.name("key") {
Some(key) => {
match key {
// [name][]
"" => format!("{}", ref_map.get(&name.to_uppercase()).unwrap()),
// [name][reference]
_ => format!("{}", ref_map.get(&key.to_uppercase()).unwrap()),
}
}
// [name] as reference
None => format!("{}", ref_map.get(&name.to_uppercase()).unwrap()),
}
}
};
format!("{} at *{}*", name, val)
}
}
});
output
}
#[cfg(test)]
mod tests {
fn parse(source: String) -> String {
super::parse_links(super::parse_references(source))
}
#[test]
fn parses_inline_link() {
let source = r"This is a [link](http://google.com) that should be expanded".to_string();
let target = r"This is a link at *http://google.com* that should be expanded".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_multiline_links() {
let source = r"This is a [link](http://google.com) that
should appear expanded. Another [location](/here/) and [another](http://gogogo)"
.to_string();
let target = r"This is a link at *http://google.com* that
should appear expanded. Another location at */here/* and another at *http://gogogo*"
.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_reference() {
let source = r"This is a [link][theref].
[theref]: http://example.com/foo
more text"
.to_string();
let target = r"This is a link at *http://example.com/foo*.
more text"
.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_implicit_link() {
let source = r"This is an [implicit][] link.
[implicit]: /The Link/"
.to_string();
let target = r"This is an implicit at */The Link/* link.".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_refs_with_one_space_indentation() {
let source = r"This is a [link][ref]
[ref]: The link"
.to_string();
let target = r"This is a link at *The link*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_refs_with_two_space_indentation() {
let source = r"This is a [link][ref]
[ref]: The link"
.to_string();
let target = r"This is a link at *The link*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_refs_with_three_space_indentation() {
let source = r"This is a [link][ref]
[ref]: The link"
.to_string();
let target = r"This is a link at *The link*".to_string();
assert_eq!(parse(source), target);
}
#[test]
#[should_panic]
fn rejects_refs_with_four_space_indentation() {
let source = r"This is a [link][ref]
[ref]: The link"
.to_string();
let target = r"This is a link at *The link*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_optional_inline_title() {
let source = r###"This is a titled [link](http://example.com "My title")."###.to_string();
let target = r"This is a titled link at *http://example.com*.".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_title_with_puctuation() {
let source = r###"[link](http://example.com "It's Title")"###.to_string();
let target = r"link at *http://example.com*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_name_with_punctuation() {
let source = r###"[I'm here](there)"###.to_string();
let target = r###"I'm here at *there*"###.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_name_with_utf8() {
let source = r###"[user’s forum](the user’s forum)"###.to_string();
let target = r###"user’s forum at *the user’s forum*"###.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_reference_with_punctuation() {
let source = r###"[link][the ref-ref]
[the ref-ref]:http://example.com/ref-ref"###
.to_string();
let target = r###"link at *http://example.com/ref-ref*"###.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_reference_case_insensitively() {
let source = r"[link][Ref]
[ref]: The reference"
.to_string();
let target = r"link at *The reference*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_link_as_reference_when_reference_is_empty() {
let source = r"[link as reference][]
[link as reference]: the actual reference"
.to_string();
let target = r"link as reference at *the actual reference*".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_link_without_reference_as_reference() {
let source = r"[link] is alone
[link]: The contents"
.to_string();
let target = r"link at *The contents* is alone".to_string();
assert_eq!(parse(source), target);
}
#[test]
#[ignore]
fn parses_link_without_reference_as_reference_with_asterisks() {
let source = r"*[link]* is alone
[link]: The contents"
.to_string();
let target = r"*link* at *The contents* is alone".to_string();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_links_in_pre_sections() {
let source = r###"```toml
[package]
name = "hello_cargo"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
[dependencies]
```
"###
.to_string();
let target = source.clone();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_links_in_quoted_sections() {
let source = r###"do not change `[package]`."###.to_string();
let target = source.clone();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_links_in_quoted_sections_containing_newlines() {
let source = r"do not change `this [package]
is still here` [link](ref)"
.to_string();
let target = r"do not change `this [package]
is still here` link at *ref*"
.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_links_in_pre_sections_while_still_handling_links() {
let source = r###"```toml
[package]
name = "hello_cargo"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
[dependencies]
```
Another [link]
more text
[link]: http://gohere
"###
.to_string();
let target = r###"```toml
[package]
name = "hello_cargo"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
[dependencies]
```
Another link at *http://gohere*
more text
"###
.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_quotes_in_pre_sections() {
let source = r###"```bash
$ cargo build
Compiling guessing_game v0.1.0 (file:///projects/guessing_game)
src/main.rs:23:21: 23:35 error: mismatched types [E0308]
src/main.rs:23 match guess.cmp(&secret_number) {
^~~~~~~~~~~~~~
src/main.rs:23:21: 23:35 help: run `rustc --explain E0308` to see a detailed explanation
src/main.rs:23:21: 23:35 note: expected type `&std::string::String`
src/main.rs:23:21: 23:35 note: found type `&_`
error: aborting due to previous error
Could not compile `guessing_game`.
```
"###
.to_string();
let target = source.clone();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_short_quotes() {
let source = r"to `1` at index `[0]` i".to_string();
let target = source.clone();
assert_eq!(parse(source), target);
}
#[test]
fn ignores_pre_sections_with_final_quote() {
let source = r###"```bash
$ cargo run
Compiling points v0.1.0 (file:///projects/points)
error: the trait bound `Point: std::fmt::Display` is not satisfied [--explain E0277]
--> src/main.rs:8:29
8 |> println!("Point 1: {}", p1);
|> ^^
<std macros>:2:27: 2:58: note: in this expansion of format_args!
<std macros>:3:1: 3:54: note: in this expansion of print! (defined in <std macros>)
src/main.rs:8:5: 8:33: note: in this expansion of println! (defined in <std macros>)
note: `Point` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string
note: required by `std::fmt::Display::fmt`
```
`here` is another [link](the ref)
"###.to_string();
let target = r###"```bash
$ cargo run
Compiling points v0.1.0 (file:///projects/points)
error: the trait bound `Point: std::fmt::Display` is not satisfied [--explain E0277]
--> src/main.rs:8:29
8 |> println!("Point 1: {}", p1);
|> ^^
<std macros>:2:27: 2:58: note: in this expansion of format_args!
<std macros>:3:1: 3:54: note: in this expansion of print! (defined in <std macros>)
src/main.rs:8:5: 8:33: note: in this expansion of println! (defined in <std macros>)
note: `Point` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string
note: required by `std::fmt::Display::fmt`
```
`here` is another link at *the ref*
"###.to_string();
assert_eq!(parse(source), target);
}
#[test]
fn parses_adam_p_cheatsheet() {
let source = r###"[I'm an inline-style link](https://www.google.com)
[I'm an inline-style link with title](https://www.google.com "Google's Homepage")
[I'm a reference-style link][Arbitrary case-insensitive reference text]
[I'm a relative reference to a repository file](../blob/master/LICENSE)
[You can use numbers for reference-style link definitions][1]
Or leave it empty and use the [link text itself][].
URLs and URLs in angle brackets will automatically get turned into links.
http://www.example.com or <http://www.example.com> and sometimes
example.com (but not on Github, for example).
Some text to show that the reference links can follow later.
[arbitrary case-insensitive reference text]: https://www.mozilla.org
[1]: http://slashdot.org
[link text itself]: http://www.reddit.com"###
.to_string();
let target = r###"I'm an inline-style link at *https://www.google.com*
I'm an inline-style link with title at *https://www.google.com*
I'm a reference-style link at *https://www.mozilla.org*
I'm a relative reference to a repository file at *../blob/master/LICENSE*
You can use numbers for reference-style link definitions at *http://slashdot.org*
Or leave it empty and use the link text itself at *http://www.reddit.com*.
URLs and URLs in angle brackets will automatically get turned into links.
http://www.example.com or <http://www.example.com> and sometimes
example.com (but not on Github, for example).
Some text to show that the reference links can follow later.
"###
.to_string();
assert_eq!(parse(source), target);
}
}