diff options
Diffstat (limited to '')
| -rw-r--r-- | src/construct/definition.rs | 44 |
1 files changed, 37 insertions, 7 deletions
diff --git a/src/construct/definition.rs b/src/construct/definition.rs index 3291f7f..48d1192 100644 --- a/src/construct/definition.rs +++ b/src/construct/definition.rs @@ -31,16 +31,46 @@ //! ``` //! //! Definitions in markdown do not, on their own, relate to anything in HTML. -//! When connected with a link (reference), they together relate to the `<a>` +//! When matched with a link (reference), they together relate to the `<a>` //! element in HTML. //! The definition forms its `href`, and optionally `title`, attributes. -//! See [*§ 4.5.1 The `a` element*][html] in the HTML spec for more info. +//! See [*§ 4.5.1 The `a` element*][html-a] in the HTML spec for more info. +//! Definitions can also match with image (reference), in which case they +//! form an `<img>` element, where the definition contributes the `src`, and +//! optionally `title`, attributes. +//! See [*§ 4.8.3 The `img` element*][html-img] in the HTML spec for more info. //! //! The `label`, `destination`, and `title` parts are interpreted as the //! [string][] content type. //! That means that [character escapes][character_escape] and //! [character references][character_reference] are allowed. //! +//! Definitions match to references through their label. +//! To match, both labels must be equal after normalizing with +//! [`normalize_identifier`][normalize_identifier]. +//! One definitions can match to multiple references. +//! Multiple definitions with the same, normalized, identifier are ignored: the +//! first definition is preferred. +//! To illustrate, the definition with a destination of `x` wins: +//! +//! ```markdown +//! [a]: x +//! [a]: y +//! +//! [a] +//! ``` +//! +//! Importantly, while labels *can* include [string][] content (character +//! escapes and character references), these are not considered when matching. +//! To illustrate, neither definition matches the reference: +//! +//! ```markdown +//! [a&b]: x +//! [a\&b]: y +//! +//! [a&b] +//! ``` +//! //! For info on how to encode characters in URLs, see //! [`partial_destination`][destination]. //! For info on how to characters are encoded as `href` on `<a>` or `src` on @@ -75,12 +105,12 @@ //! [character_escape]: crate::construct::character_escape //! [character_reference]: crate::construct::character_reference //! [destination]: crate::construct::partial_destination -//! [sanitize_uri]: crate::util::sanitize_uri -//! [html]: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-a-element -//! -//! <!-- To do: link link (reference) --> +//! [sanitize_uri]: crate::util::sanitize_uri::sanitize_uri +//! [normalize_identifier]: crate::util::normalize_identifier +//! [html-a]: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-a-element +//! [html-img]: https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element //! -//! <!-- To do: describe how references and definitions match --> +//! <!-- To do: link link/image (reference) --> use crate::construct::{ partial_destination::{start as destination, Options as DestinationOptions}, |