// 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))]
#[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;
}
}