parent
6869645e86
commit
23da54d894
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@ -1,296 +1,3 @@
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% Rust Documentation
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`rustdoc` is the built-in tool for generating documentation. It integrates
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with the compiler to provide accurate hyperlinking between usage of types and
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their documentation. Furthermore, by not using a separate parser, it will
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never reject your valid Rust code.
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# Creating Documentation
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Documenting Rust APIs is quite simple. To document a given item, we have "doc
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comments":
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~~~
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# #![allow(unused_attribute)]
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// the "link" crate attribute is currently required for rustdoc, but normally
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// isn't needed.
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#![crate_id = "universe"]
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#![crate_type="lib"]
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//! Tools for dealing with universes (this is a doc comment, and is shown on
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//! the crate index page. The ! makes it apply to the parent of the comment,
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//! rather than what follows).
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# mod workaround_the_outer_function_rustdoc_inserts {
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/// Widgets are very common (this is a doc comment, and will show up on
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/// Widget's documentation).
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pub struct Widget {
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/// All widgets have a purpose (this is a doc comment, and will show up
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/// the field's documentation).
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purpose: String,
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/// Humans are not allowed to understand some widgets
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understandable: bool
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}
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pub fn recalibrate() {
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//! Recalibrate a pesky universe (this is also a doc comment, like above,
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//! the documentation will be applied to the *parent* item, so
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//! `recalibrate`).
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/* ... */
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}
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# }
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~~~
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Documentation can also be controlled via the `doc` attribute on items. This is
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implicitly done by the compiler when using the above form of doc comments
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(converting the slash-based comments to `#[doc]` attributes).
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~~~
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#[doc = "
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Calculates the factorial of a number.
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Given the input integer `n`, this function will calculate `n!` and return it.
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"]
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pub fn factorial(n: int) -> int { if n < 2 {1} else {n * factorial(n - 1)} }
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# fn main() {}
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~~~
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The `doc` attribute can also be used to control how rustdoc emits documentation
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in some cases.
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```
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// Rustdoc will inline documentation of a `pub use` into this crate when the
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// `pub use` reaches across crates, but this behavior can also be disabled.
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#[doc(no_inline)]
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pub use std::option::Option;
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# fn main() {}
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```
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Doc comments are markdown, and are currently parsed with the
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[hoedown][hoedown] library. rustdoc does not yet do any fanciness such as
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referencing other items inline, like javadoc's `@see`. One exception to this
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is that the first paragraph will be used as the "summary" of an item in the
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generated documentation:
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~~~
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/// A whizbang. Does stuff. (this line is the summary)
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///
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/// Whizbangs are ...
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struct Whizbang;
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~~~
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To generate the docs, run `rustdoc universe.rs`. By default, it generates a
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directory called `doc`, with the documentation for `universe` being in
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`doc/universe/index.html`. If you are using other crates with `extern crate`,
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rustdoc will even link to them when you use their types, as long as their
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documentation has already been generated by a previous run of rustdoc, or the
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crate advertises that its documentation is hosted at a given URL.
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The generated output can be controlled with the `doc` crate attribute, which
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is how the above advertisement works. An example from the `libstd`
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documentation:
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~~~
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#[doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "http://www.rust-lang.org/favicon.ico",
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html_root_url = "http://doc.rust-lang.org/")];
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~~~
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The `html_root_url` is the prefix that rustdoc will apply to any references to
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that crate's types etc.
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rustdoc can also generate JSON, for consumption by other tools, with
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`rustdoc --output-format json`, and also consume already-generated JSON with
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`rustdoc --input-format json`.
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rustdoc also supports personalizing the output from crates' documentation,
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similar to markdown options.
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- `--html-in-header FILE`: includes the contents of `FILE` at the
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end of the `<head>...</head>` section.
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- `--html-before-content FILE`: includes the contents of `FILE`
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directly after `<body>`, before the rendered content (including the
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search bar).
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- `--html-after-content FILE`: includes the contents of `FILE`
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after all the rendered content.
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# Using the Documentation
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The web pages generated by rustdoc present the same logical hierarchy that one
|
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writes a library with. Every kind of item (function, struct, etc) has its own
|
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color, and one can always click on a colored type to jump to its
|
||||
documentation. There is a search bar at the top, which is powered by some
|
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JavaScript and a statically-generated search index. No special web server is
|
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required for the search.
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[hoedown]: https://github.com/hoedown/hoedown
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# Testing the Documentation
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`rustdoc` has support for testing code examples which appear in the
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documentation. This is helpful for keeping code examples up to date with the
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source code.
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To test documentation, the `--test` argument is passed to rustdoc:
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~~~ {.sh}
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rustdoc --test crate.rs
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~~~
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## Defining tests
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Rust documentation currently uses the markdown format, and rustdoc treats all
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code blocks as testable-by-default unless they carry a language tag of another
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language. In order to not run a test over a block of code, the `ignore` string
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can be added to the three-backtick form of markdown code block.
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~~~md
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```
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// This is a testable code block
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```
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```rust{.example}
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// This is rust and also testable
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```
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```ignore
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// This is not a testable code block
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```
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// This is a testable code block (4-space indent)
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```sh
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# this is shell code and not tested
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```
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~~~
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You can specify that the test's execution should fail with the `should_fail`
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directive.
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~~~md
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```should_fail
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// This code block is expected to generate a panic when run
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```
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~~~
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You can specify that the code block should be compiled but not run with the
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`no_run` directive.
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~~~md
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```no_run
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// This code will be compiled but not executed
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```
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~~~
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Lastly, you can specify that a code block be compiled as if `--test`
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were passed to the compiler using the `test_harness` directive.
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~~~md
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```test_harness
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#[test]
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fn foo() {
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panic!("oops! (will run & register as a failed test)")
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}
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```
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~~~
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Rustdoc also supplies some extra sugar for helping with some tedious
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documentation examples. If a line is prefixed with `# `, then the line
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will not show up in the HTML documentation, but it will be used when
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testing the code block (NB. the space after the `#` is required, so
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that one can still write things like `#[derive(Eq)]`).
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~~~md
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```
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# /!\ The three following lines are comments, which are usually stripped off by
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# the doc-generating tool. In order to display them anyway in this particular
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# case, the character following the leading '#' is not a usual space like in
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# these first five lines but a non breakable one.
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# // showing 'fib' in this documentation would just be tedious and detracts from
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# // what's actually being documented.
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# fn fib(n: int) { n + 2 }
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spawn(move || { fib(200); })
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```
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~~~
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The documentation online would look like `spawn(move || { fib(200); })`, but when
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testing this code, the `fib` function will be included (so it can compile).
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Rustdoc will automatically add a `main()` wrapper around your code, and in the right
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place. For example:
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```
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/// ```
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/// use std::rc::Rc;
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///
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/// let five = Rc::new(5);
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/// ```
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# fn foo() {}
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```
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This will end up testing:
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```
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fn main() {
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use std::rc::Rc;
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let five = Rc::new(5);
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}
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```
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Here's the full algorithm:
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1. Given a code block, if it does not contain `fn main`, it is wrapped in `fn main() { your_code }`
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2. Given that result, if it contains no `extern crate` directives but it also
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contains the name of the crate being tested, then `extern crate <name>` is
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injected at the top.
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3. Some common `allow` attributes are added for documentation examples at the top.
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## Running tests (advanced)
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Running tests often requires some special configuration to filter tests, find
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libraries, or try running ignored examples. The testing framework that rustdoc
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uses is built on crate `test`, which is also used when you compile crates with
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rustc's `--test` flag. Extra arguments can be passed to rustdoc's test harness
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with the `--test-args` flag.
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~~~console
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# Only run tests containing 'foo' in their name
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$ rustdoc --test lib.rs --test-args 'foo'
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# See what's possible when running tests
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$ rustdoc --test lib.rs --test-args '--help'
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~~~
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When testing a library, code examples will often show how functions are used,
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and this code often requires `use`-ing paths from the crate. To accommodate this,
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rustdoc will implicitly add `extern crate <crate>;` where `<crate>` is the name of
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the crate being tested to the top of each code example. This means that rustdoc
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must be able to find a compiled version of the library crate being tested. Extra
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search paths may be added via the `-L` flag to `rustdoc`.
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# Standalone Markdown files
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As well as Rust crates, rustdoc supports rendering pure Markdown files
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into HTML and testing the code snippets from them. A Markdown file is
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detected by a `.md` or `.markdown` extension.
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There are 4 options to modify the output that Rustdoc creates.
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- `--markdown-css PATH`: adds a `<link rel="stylesheet">` tag pointing to `PATH`.
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- `--html-in-header FILE`: includes the contents of `FILE` at the
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||||
end of the `<head>...</head>` section.
|
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- `--html-before-content FILE`: includes the contents of `FILE`
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||||
directly after `<body>`, before the rendered content (including the
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title).
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- `--html-after-content FILE`: includes the contents of `FILE`
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directly before `</body>`, after all the rendered content.
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All of these can be specified multiple times, and they are output in
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the order in which they are specified. The first line of the file being rendered must
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be the title, prefixed with `%` (e.g. this page has `% Rust
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Documentation` on the first line).
|
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Like with a Rust crate, the `--test` argument will run the code
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examples to check they compile, and obeys any `--test-args` flags. The
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tests are named after the last `#` heading.
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This has been moved [into the book](book/documentation.html).
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|
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|
@ -28,6 +28,7 @@
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* [Traits](traits.md)
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* [Threads](threads.md)
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* [Error Handling](error-handling.md)
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* [Documentation](documentation.md)
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* [III: Advanced Topics](advanced.md)
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* [FFI](ffi.md)
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* [Unsafe Code](unsafe.md)
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|
|
|
@ -0,0 +1,296 @@
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|||
% Rust Documentation
|
||||
|
||||
`rustdoc` is the built-in tool for generating documentation. It integrates
|
||||
with the compiler to provide accurate hyperlinking between usage of types and
|
||||
their documentation. Furthermore, by not using a separate parser, it will
|
||||
never reject your valid Rust code.
|
||||
|
||||
# Creating Documentation
|
||||
|
||||
Documenting Rust APIs is quite simple. To document a given item, we have "doc
|
||||
comments":
|
||||
|
||||
~~~
|
||||
# #![allow(unused_attribute)]
|
||||
// the "link" crate attribute is currently required for rustdoc, but normally
|
||||
// isn't needed.
|
||||
#![crate_id = "universe"]
|
||||
#![crate_type="lib"]
|
||||
|
||||
//! Tools for dealing with universes (this is a doc comment, and is shown on
|
||||
//! the crate index page. The ! makes it apply to the parent of the comment,
|
||||
//! rather than what follows).
|
||||
|
||||
# mod workaround_the_outer_function_rustdoc_inserts {
|
||||
/// Widgets are very common (this is a doc comment, and will show up on
|
||||
/// Widget's documentation).
|
||||
pub struct Widget {
|
||||
/// All widgets have a purpose (this is a doc comment, and will show up
|
||||
/// the field's documentation).
|
||||
purpose: String,
|
||||
/// Humans are not allowed to understand some widgets
|
||||
understandable: bool
|
||||
}
|
||||
|
||||
pub fn recalibrate() {
|
||||
//! Recalibrate a pesky universe (this is also a doc comment, like above,
|
||||
//! the documentation will be applied to the *parent* item, so
|
||||
//! `recalibrate`).
|
||||
/* ... */
|
||||
}
|
||||
# }
|
||||
~~~
|
||||
|
||||
Documentation can also be controlled via the `doc` attribute on items. This is
|
||||
implicitly done by the compiler when using the above form of doc comments
|
||||
(converting the slash-based comments to `#[doc]` attributes).
|
||||
|
||||
~~~
|
||||
#[doc = "
|
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Calculates the factorial of a number.
|
||||
|
||||
Given the input integer `n`, this function will calculate `n!` and return it.
|
||||
"]
|
||||
pub fn factorial(n: int) -> int { if n < 2 {1} else {n * factorial(n - 1)} }
|
||||
# fn main() {}
|
||||
~~~
|
||||
|
||||
The `doc` attribute can also be used to control how rustdoc emits documentation
|
||||
in some cases.
|
||||
|
||||
```
|
||||
// Rustdoc will inline documentation of a `pub use` into this crate when the
|
||||
// `pub use` reaches across crates, but this behavior can also be disabled.
|
||||
#[doc(no_inline)]
|
||||
pub use std::option::Option;
|
||||
# fn main() {}
|
||||
```
|
||||
|
||||
Doc comments are markdown, and are currently parsed with the
|
||||
[hoedown][hoedown] library. rustdoc does not yet do any fanciness such as
|
||||
referencing other items inline, like javadoc's `@see`. One exception to this
|
||||
is that the first paragraph will be used as the "summary" of an item in the
|
||||
generated documentation:
|
||||
|
||||
~~~
|
||||
/// A whizbang. Does stuff. (this line is the summary)
|
||||
///
|
||||
/// Whizbangs are ...
|
||||
struct Whizbang;
|
||||
~~~
|
||||
|
||||
To generate the docs, run `rustdoc universe.rs`. By default, it generates a
|
||||
directory called `doc`, with the documentation for `universe` being in
|
||||
`doc/universe/index.html`. If you are using other crates with `extern crate`,
|
||||
rustdoc will even link to them when you use their types, as long as their
|
||||
documentation has already been generated by a previous run of rustdoc, or the
|
||||
crate advertises that its documentation is hosted at a given URL.
|
||||
|
||||
The generated output can be controlled with the `doc` crate attribute, which
|
||||
is how the above advertisement works. An example from the `libstd`
|
||||
documentation:
|
||||
|
||||
~~~
|
||||
#[doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
|
||||
html_favicon_url = "http://www.rust-lang.org/favicon.ico",
|
||||
html_root_url = "http://doc.rust-lang.org/")];
|
||||
~~~
|
||||
|
||||
The `html_root_url` is the prefix that rustdoc will apply to any references to
|
||||
that crate's types etc.
|
||||
|
||||
rustdoc can also generate JSON, for consumption by other tools, with
|
||||
`rustdoc --output-format json`, and also consume already-generated JSON with
|
||||
`rustdoc --input-format json`.
|
||||
|
||||
rustdoc also supports personalizing the output from crates' documentation,
|
||||
similar to markdown options.
|
||||
|
||||
- `--html-in-header FILE`: includes the contents of `FILE` at the
|
||||
end of the `<head>...</head>` section.
|
||||
- `--html-before-content FILE`: includes the contents of `FILE`
|
||||
directly after `<body>`, before the rendered content (including the
|
||||
search bar).
|
||||
- `--html-after-content FILE`: includes the contents of `FILE`
|
||||
after all the rendered content.
|
||||
|
||||
# Using the Documentation
|
||||
|
||||
The web pages generated by rustdoc present the same logical hierarchy that one
|
||||
writes a library with. Every kind of item (function, struct, etc) has its own
|
||||
color, and one can always click on a colored type to jump to its
|
||||
documentation. There is a search bar at the top, which is powered by some
|
||||
JavaScript and a statically-generated search index. No special web server is
|
||||
required for the search.
|
||||
|
||||
[hoedown]: https://github.com/hoedown/hoedown
|
||||
|
||||
# Testing the Documentation
|
||||
|
||||
`rustdoc` has support for testing code examples which appear in the
|
||||
documentation. This is helpful for keeping code examples up to date with the
|
||||
source code.
|
||||
|
||||
To test documentation, the `--test` argument is passed to rustdoc:
|
||||
|
||||
~~~ {.sh}
|
||||
rustdoc --test crate.rs
|
||||
~~~
|
||||
|
||||
## Defining tests
|
||||
|
||||
Rust documentation currently uses the markdown format, and rustdoc treats all
|
||||
code blocks as testable-by-default unless they carry a language tag of another
|
||||
language. In order to not run a test over a block of code, the `ignore` string
|
||||
can be added to the three-backtick form of markdown code block.
|
||||
|
||||
~~~md
|
||||
```
|
||||
// This is a testable code block
|
||||
```
|
||||
|
||||
```rust{.example}
|
||||
// This is rust and also testable
|
||||
```
|
||||
|
||||
```ignore
|
||||
// This is not a testable code block
|
||||
```
|
||||
|
||||
// This is a testable code block (4-space indent)
|
||||
|
||||
```sh
|
||||
# this is shell code and not tested
|
||||
```
|
||||
~~~
|
||||
|
||||
You can specify that the test's execution should fail with the `should_fail`
|
||||
directive.
|
||||
|
||||
~~~md
|
||||
```should_fail
|
||||
// This code block is expected to generate a panic when run
|
||||
```
|
||||
~~~
|
||||
|
||||
You can specify that the code block should be compiled but not run with the
|
||||
`no_run` directive.
|
||||
|
||||
~~~md
|
||||
```no_run
|
||||
// This code will be compiled but not executed
|
||||
```
|
||||
~~~
|
||||
|
||||
Lastly, you can specify that a code block be compiled as if `--test`
|
||||
were passed to the compiler using the `test_harness` directive.
|
||||
|
||||
~~~md
|
||||
```test_harness
|
||||
#[test]
|
||||
fn foo() {
|
||||
panic!("oops! (will run & register as a failed test)")
|
||||
}
|
||||
```
|
||||
~~~
|
||||
|
||||
Rustdoc also supplies some extra sugar for helping with some tedious
|
||||
documentation examples. If a line is prefixed with `# `, then the line
|
||||
will not show up in the HTML documentation, but it will be used when
|
||||
testing the code block (NB. the space after the `#` is required, so
|
||||
that one can still write things like `#[derive(Eq)]`).
|
||||
|
||||
~~~md
|
||||
```
|
||||
# /!\ The three following lines are comments, which are usually stripped off by
|
||||
# the doc-generating tool. In order to display them anyway in this particular
|
||||
# case, the character following the leading '#' is not a usual space like in
|
||||
# these first five lines but a non breakable one.
|
||||
# // showing 'fib' in this documentation would just be tedious and detracts from
|
||||
# // what's actually being documented.
|
||||
# fn fib(n: int) { n + 2 }
|
||||
|
||||
spawn(move || { fib(200); })
|
||||
```
|
||||
~~~
|
||||
|
||||
The documentation online would look like `spawn(move || { fib(200); })`, but when
|
||||
testing this code, the `fib` function will be included (so it can compile).
|
||||
|
||||
Rustdoc will automatically add a `main()` wrapper around your code, and in the right
|
||||
place. For example:
|
||||
|
||||
```
|
||||
/// ```
|
||||
/// use std::rc::Rc;
|
||||
///
|
||||
/// let five = Rc::new(5);
|
||||
/// ```
|
||||
# fn foo() {}
|
||||
```
|
||||
|
||||
This will end up testing:
|
||||
|
||||
```
|
||||
fn main() {
|
||||
use std::rc::Rc;
|
||||
let five = Rc::new(5);
|
||||
}
|
||||
```
|
||||
|
||||
Here's the full algorithm:
|
||||
|
||||
1. Given a code block, if it does not contain `fn main`, it is wrapped in `fn main() { your_code }`
|
||||
2. Given that result, if it contains no `extern crate` directives but it also
|
||||
contains the name of the crate being tested, then `extern crate <name>` is
|
||||
injected at the top.
|
||||
3. Some common `allow` attributes are added for documentation examples at the top.
|
||||
|
||||
## Running tests (advanced)
|
||||
|
||||
Running tests often requires some special configuration to filter tests, find
|
||||
libraries, or try running ignored examples. The testing framework that rustdoc
|
||||
uses is built on crate `test`, which is also used when you compile crates with
|
||||
rustc's `--test` flag. Extra arguments can be passed to rustdoc's test harness
|
||||
with the `--test-args` flag.
|
||||
|
||||
~~~console
|
||||
# Only run tests containing 'foo' in their name
|
||||
$ rustdoc --test lib.rs --test-args 'foo'
|
||||
|
||||
# See what's possible when running tests
|
||||
$ rustdoc --test lib.rs --test-args '--help'
|
||||
~~~
|
||||
|
||||
When testing a library, code examples will often show how functions are used,
|
||||
and this code often requires `use`-ing paths from the crate. To accommodate this,
|
||||
rustdoc will implicitly add `extern crate <crate>;` where `<crate>` is the name of
|
||||
the crate being tested to the top of each code example. This means that rustdoc
|
||||
must be able to find a compiled version of the library crate being tested. Extra
|
||||
search paths may be added via the `-L` flag to `rustdoc`.
|
||||
|
||||
# Standalone Markdown files
|
||||
|
||||
As well as Rust crates, rustdoc supports rendering pure Markdown files
|
||||
into HTML and testing the code snippets from them. A Markdown file is
|
||||
detected by a `.md` or `.markdown` extension.
|
||||
|
||||
There are 4 options to modify the output that Rustdoc creates.
|
||||
|
||||
- `--markdown-css PATH`: adds a `<link rel="stylesheet">` tag pointing to `PATH`.
|
||||
- `--html-in-header FILE`: includes the contents of `FILE` at the
|
||||
end of the `<head>...</head>` section.
|
||||
- `--html-before-content FILE`: includes the contents of `FILE`
|
||||
directly after `<body>`, before the rendered content (including the
|
||||
title).
|
||||
- `--html-after-content FILE`: includes the contents of `FILE`
|
||||
directly before `</body>`, after all the rendered content.
|
||||
|
||||
All of these can be specified multiple times, and they are output in
|
||||
the order in which they are specified. The first line of the file being rendered must
|
||||
be the title, prefixed with `%` (e.g. this page has `% Rust
|
||||
Documentation` on the first line).
|
||||
|
||||
Like with a Rust crate, the `--test` argument will run the code
|
||||
examples to check they compile, and obeys any `--test-args` flags. The
|
||||
tests are named after the last `#` heading.
|
Loading…
Reference in New Issue