// Copyright 2015 Google Inc. All rights reserved. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. //! Pull parser for [CommonMark](https://commonmark.org). This crate provides a [Parser](struct.Parser.html) struct //! which is an iterator over [Event](enum.Event.html)s. This iterator can be used //! directly, or to output HTML using the [HTML module](html/index.html). //! //! By default, only CommonMark features are enabled. To use extensions like tables, //! footnotes or task lists, enable them by setting the corresponding flags in the //! [Options](struct.Options.html) struct. //! //! # Example //! ```rust //! use pulldown_cmark::{Parser, Options, html}; //! //! let markdown_input = "Hello world, this is a ~~complicated~~ *very simple* example."; //! //! // Set up options and parser. Strikethroughs are not part of the CommonMark standard //! // and we therefore must enable it explicitly. //! let mut options = Options::empty(); //! options.insert(Options::ENABLE_STRIKETHROUGH); //! let parser = Parser::new_ext(markdown_input, options); //! //! // Write to String buffer. //! let mut html_output = String::new(); //! html::push_html(&mut html_output, parser); //! //! // Check that the output is what we expected. //! let expected_html = "

Hello world, this is a complicated very simple example.

\n"; //! assert_eq!(expected_html, &html_output); //! ``` // When compiled for the rustc compiler itself we want to make sure that this is // an unstable crate. #![cfg_attr(rustbuild, feature(staged_api, rustc_private))] #![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))] // Forbid unsafe code unless the SIMD feature is enabled. #![cfg_attr(not(feature = "simd"), forbid(unsafe_code))] #![warn(missing_debug_implementations)] #[cfg(feature = "serde")] use serde::{Deserialize, Serialize}; pub mod html; mod entities; pub mod escape; mod firstpass; mod linklabel; mod parse; mod puncttable; mod scanners; mod strings; mod tree; use std::{convert::TryFrom, fmt::Display}; pub use crate::parse::{BrokenLink, BrokenLinkCallback, LinkDef, OffsetIter, Parser, RefDefs}; pub use crate::strings::{CowStr, InlineStr}; /// Codeblock kind. #[derive(Clone, Debug, PartialEq)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum CodeBlockKind<'a> { Indented, /// The value contained in the tag describes the language of the code, which may be empty. #[cfg_attr(feature = "serde", serde(borrow))] Fenced(CowStr<'a>), } impl<'a> CodeBlockKind<'a> { pub fn is_indented(&self) -> bool { matches!(*self, CodeBlockKind::Indented) } pub fn is_fenced(&self) -> bool { matches!(*self, CodeBlockKind::Fenced(_)) } } /// Tags for elements that can contain other elements. #[derive(Clone, Debug, PartialEq)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum Tag<'a> { /// A paragraph of text and other inline elements. Paragraph, /// A heading. The first field indicates the level of the heading, /// the second the fragment identifier, and the third the classes. Heading(HeadingLevel, Option<&'a str>, Vec<&'a str>), BlockQuote, /// A code block. CodeBlock(CodeBlockKind<'a>), /// A list. If the list is ordered the field indicates the number of the first item. /// Contains only list items. List(Option), // TODO: add delim and tight for ast (not needed for html) /// A list item. Item, /// A footnote definition. The value contained is the footnote's label by which it can /// be referred to. #[cfg_attr(feature = "serde", serde(borrow))] FootnoteDefinition(CowStr<'a>), /// A table. Contains a vector describing the text-alignment for each of its columns. Table(Vec), /// A table header. Contains only `TableCell`s. Note that the table body starts immediately /// after the closure of the `TableHead` tag. There is no `TableBody` tag. TableHead, /// A table row. Is used both for header rows as body rows. Contains only `TableCell`s. TableRow, TableCell, // span-level tags Emphasis, Strong, Strikethrough, /// A link. The first field is the link type, the second the destination URL and the third is a title. Link(LinkType, CowStr<'a>, CowStr<'a>), /// An image. The first field is the link type, the second the destination URL and the third is a title. Image(LinkType, CowStr<'a>, CowStr<'a>), } #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum HeadingLevel { H1 = 1, H2, H3, H4, H5, H6, } impl Display for HeadingLevel { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { match self { Self::H1 => write!(f, "h1"), Self::H2 => write!(f, "h2"), Self::H3 => write!(f, "h3"), Self::H4 => write!(f, "h4"), Self::H5 => write!(f, "h5"), Self::H6 => write!(f, "h6"), } } } /// Returned when trying to convert a `usize` into a `Heading` but it fails /// because the usize isn't a valid heading level #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)] pub struct InvalidHeadingLevel(usize); impl TryFrom for HeadingLevel { type Error = InvalidHeadingLevel; fn try_from(value: usize) -> Result { match value { 1 => Ok(Self::H1), 2 => Ok(Self::H2), 3 => Ok(Self::H3), 4 => Ok(Self::H4), 5 => Ok(Self::H5), 6 => Ok(Self::H6), _ => Err(InvalidHeadingLevel(value)), } } } /// Type specifier for inline links. See [the Tag::Link](enum.Tag.html#variant.Link) for more information. #[derive(Clone, Debug, PartialEq, Copy)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum LinkType { /// Inline link like `[foo](bar)` Inline, /// Reference link like `[foo][bar]` Reference, /// Reference without destination in the document, but resolved by the broken_link_callback ReferenceUnknown, /// Collapsed link like `[foo][]` Collapsed, /// Collapsed link without destination in the document, but resolved by the broken_link_callback CollapsedUnknown, /// Shortcut link like `[foo]` Shortcut, /// Shortcut without destination in the document, but resolved by the broken_link_callback ShortcutUnknown, /// Autolink like `` Autolink, /// Email address in autolink like `` Email, } impl LinkType { fn to_unknown(self) -> Self { match self { LinkType::Reference => LinkType::ReferenceUnknown, LinkType::Collapsed => LinkType::CollapsedUnknown, LinkType::Shortcut => LinkType::ShortcutUnknown, _ => unreachable!(), } } } /// Markdown events that are generated in a preorder traversal of the document /// tree, with additional `End` events whenever all of an inner node's children /// have been visited. #[derive(Clone, Debug, PartialEq)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum Event<'a> { /// Start of a tagged element. Events that are yielded after this event /// and before its corresponding `End` event are inside this element. /// Start and end events are guaranteed to be balanced. #[cfg_attr(feature = "serde", serde(borrow))] Start(Tag<'a>), /// End of a tagged element. #[cfg_attr(feature = "serde", serde(borrow))] End(Tag<'a>), /// A text node. #[cfg_attr(feature = "serde", serde(borrow))] Text(CowStr<'a>), /// An inline code node. #[cfg_attr(feature = "serde", serde(borrow))] Code(CowStr<'a>), /// An HTML node. #[cfg_attr(feature = "serde", serde(borrow))] Html(CowStr<'a>), /// A reference to a footnote with given label, which may or may not be defined /// by an event with a `Tag::FootnoteDefinition` tag. Definitions and references to them may /// occur in any order. #[cfg_attr(feature = "serde", serde(borrow))] FootnoteReference(CowStr<'a>), /// A soft line break. SoftBreak, /// A hard line break. HardBreak, /// A horizontal ruler. Rule, /// A task list marker, rendered as a checkbox in HTML. Contains a true when it is checked. TaskListMarker(bool), } /// Table column text alignment. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] pub enum Alignment { /// Default text alignment. None, Left, Center, Right, } bitflags::bitflags! { /// Option struct containing flags for enabling extra features /// that are not part of the CommonMark spec. pub struct Options: u32 { const ENABLE_TABLES = 1 << 1; const ENABLE_FOOTNOTES = 1 << 2; const ENABLE_STRIKETHROUGH = 1 << 3; const ENABLE_TASKLISTS = 1 << 4; const ENABLE_SMART_PUNCTUATION = 1 << 5; /// Extension to allow headings to have ID and classes. /// /// `# text { #id .class1 .class2 }` is interpreted as a level 1 heading /// with the content `text`, ID `id`, and classes `class1` and `class2`. /// Note that attributes (ID and classes) should be space-separated. const ENABLE_HEADING_ATTRIBUTES = 1 << 6; } }