699 lines
21 KiB
Rust
699 lines
21 KiB
Rust
pub mod html;
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mod attr;
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mod block;
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mod inline;
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mod lex;
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mod span;
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mod tree;
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use span::Span;
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pub use attr::Attributes;
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type CowStr<'s> = std::borrow::Cow<'s, str>;
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const EOF: char = '\0';
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#[derive(Debug, PartialEq, Eq)]
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pub enum Event<'s> {
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/// Start of a container.
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Start(Container<'s>, Attributes<'s>),
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/// End of a container.
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End(Container<'s>),
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/// A string object, text only.
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Str(CowStr<'s>),
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/// An atomic element.
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Atom(Atom),
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum Container<'s> {
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/// A blockquote element.
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Blockquote,
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/// A list.
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List(List),
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/// An item of a list
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ListItem,
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/// A description list element.
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DescriptionList,
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/// Details describing a term within a description list.
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DescriptionDetails,
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/// A footnote definition.
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Footnote { tag: &'s str },
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/// A table element.
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Table,
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/// A row element of a table.
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TableRow,
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/// A block-level divider element.
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Div { class: Option<&'s str> },
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/// A paragraph.
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Paragraph,
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/// A heading.
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Heading { level: usize },
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/// A cell element of row within a table.
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TableCell,
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/// A term within a description list.
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DescriptionTerm,
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/// A block with raw markup for a specific output format.
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RawBlock { format: &'s str },
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/// A block with code in a specific language.
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CodeBlock { lang: Option<&'s str> },
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/// An inline divider element.
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Span,
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/// An inline link with a destination URL.
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Link(CowStr<'s>, LinkType),
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/// An inline image with a source URL. Inner Str objects compose the alternative text.
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Image(CowStr<'s>, SpanLinkType),
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/// An inline verbatim string.
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Verbatim,
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/// An inline or display math element.
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Math { display: bool },
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/// Inline raw markup for a specific output format.
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RawInline { format: &'s str },
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/// A subscripted element.
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Subscript,
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/// A superscripted element.
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Superscript,
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/// An inserted inline element.
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Insert,
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/// A deleted inline element.
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Delete,
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/// An inline element emphasized with a bold typeface.
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Strong,
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/// An emphasized inline element.
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Emphasis,
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/// A highlighted inline element.
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Mark,
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/// An quoted inline element, using single quotes.
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SingleQuoted,
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/// A quoted inline element, using double quotes.
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DoubleQuoted,
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}
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impl<'s> Container<'s> {
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/// Is a block element.
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fn is_block(&self) -> bool {
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match self {
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Self::Blockquote
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| Self::List(..)
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| Self::ListItem
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| Self::DescriptionList
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| Self::DescriptionDetails
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| Self::Footnote { .. }
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| Self::Table
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| Self::TableRow
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| Self::Div { .. }
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| Self::Paragraph
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| Self::Heading { .. }
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| Self::DescriptionTerm
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| Self::TableCell
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| Self::RawBlock { .. }
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| Self::CodeBlock { .. } => true,
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Self::Span
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| Self::Link(..)
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| Self::Image(..)
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| Self::Verbatim
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| Self::Math { .. }
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| Self::RawInline { .. }
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| Self::Subscript
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| Self::Superscript
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| Self::Insert
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| Self::Delete
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| Self::Strong
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| Self::Emphasis
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| Self::Mark
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| Self::SingleQuoted
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| Self::DoubleQuoted => false,
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}
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}
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/// Is a block element that may contain children blocks.
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fn is_block_container(&self) -> bool {
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match self {
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Self::Blockquote
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| Self::List(..)
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| Self::ListItem
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| Self::DescriptionList
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| Self::DescriptionDetails
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| Self::Footnote { .. }
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| Self::Table
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| Self::TableRow
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| Self::Div { .. } => true,
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Self::Paragraph
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| Self::Heading { .. }
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| Self::TableCell
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| Self::DescriptionTerm
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| Self::RawBlock { .. }
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| Self::CodeBlock { .. }
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| Self::Span
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| Self::Link(..)
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| Self::Image(..)
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| Self::Verbatim
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| Self::Math { .. }
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| Self::RawInline { .. }
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| Self::Subscript
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| Self::Superscript
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| Self::Insert
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| Self::Delete
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| Self::Strong
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| Self::Emphasis
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| Self::Mark
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| Self::SingleQuoted
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| Self::DoubleQuoted => false,
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}
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}
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum SpanLinkType {
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Inline,
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Reference,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum LinkType {
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Span(SpanLinkType),
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AutoLink,
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Email,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum List {
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Unordered,
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Ordered { kind: OrderedListKind, start: u32 },
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Description,
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Task,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum OrderedListKind {
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/// Decimal numbering, e.g. `1)`.
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Decimal,
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/// Lowercase alphabetic numbering, e.g. `a)`.
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AlphaLower,
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/// Uppercase alphabetic numbering, e.g. `A)`.
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AlphaUpper,
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/// Lowercase roman numbering, e.g. `iv)`.
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RomanLower,
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/// Uppercase roman numbering, e.g. `IV)`.
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RomanUpper,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum OrderedListStyle {
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/// Number is followed by a period, e.g. `1.`.
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Period,
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/// Number is followed by a closing parenthesis, e.g. `1)`.
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Paren,
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/// Number is enclosed by parentheses, e.g. `(1)`.
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ParenParen,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub enum Atom {
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/// A horizontal ellipsis, i.e. a set of three periods.
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Ellipsis,
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/// An en dash.
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EnDash,
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/// An em dash.
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EmDash,
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/// A thematic break, typically a horizontal rule.
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ThematicBreak,
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/// A space that must not break a line.
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NonBreakingSpace,
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/// A newline that may or may not break a line in the output.
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Softbreak,
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/// A newline that must break a line in the output.
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Hardbreak,
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/// An escape character, not visible in output.
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Escape,
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/// A blank line, not visible in output.
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Blankline,
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}
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impl<'s> Container<'s> {
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fn from_leaf_block(content: &str, l: block::Leaf) -> Self {
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match l {
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block::Leaf::Paragraph => Self::Paragraph,
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block::Leaf::Heading => Self::Heading {
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level: content.len(),
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},
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block::Leaf::CodeBlock => panic!(),
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_ => todo!(),
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}
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}
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fn from_container_block(content: &'s str, c: block::Container) -> Self {
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match c {
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block::Container::Blockquote => Self::Blockquote,
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block::Container::Div => panic!(),
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block::Container::Footnote => Self::Footnote { tag: content },
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block::Container::ListItem => todo!(),
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}
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}
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}
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#[derive(Clone)]
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struct InlineChars<'s, 't> {
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src: &'s str,
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inlines: std::slice::Iter<'t, Span>,
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next: std::str::Chars<'s>,
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}
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// Implement inlines.flat_map(|sp| sp.of(self.src).chars())
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impl<'s, 't> InlineChars<'s, 't> {
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fn new(src: &'s str, inlines: &'t [Span]) -> Self {
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Self {
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src,
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inlines: inlines.iter(),
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next: "".chars(),
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}
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}
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}
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impl<'s, 't> Iterator for InlineChars<'s, 't> {
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type Item = char;
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fn next(&mut self) -> Option<Self::Item> {
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(&mut self.inlines)
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.flat_map(|sp| sp.of(self.src).chars())
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.next()
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}
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}
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trait DiscontinuousString<'s> {
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type Chars: Iterator<Item = char>;
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fn src(&self, span: Span) -> CowStr<'s>;
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fn chars(&self) -> Self::Chars;
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}
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impl<'s> DiscontinuousString<'s> for &'s str {
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type Chars = std::str::Chars<'s>;
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fn src(&self, span: Span) -> CowStr<'s> {
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span.of(self).into()
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}
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fn chars(&self) -> Self::Chars {
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str::chars(self)
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}
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}
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impl<'s> DiscontinuousString<'s> for InlineSpans<'s> {
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type Chars = InlineChars<'s, 'static>;
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/// Borrow if continuous, copy if discontiunous.
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fn src(&self, span: Span) -> CowStr<'s> {
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let mut a = 0;
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let mut s = String::new();
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for sp in &self.spans {
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let b = a + sp.len();
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if span.start() < b {
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let r = if a <= span.start() {
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if span.end() <= b {
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// continuous
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return CowStr::Borrowed(
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&sp.of(self.src)[span.start() - a..span.end() - a],
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);
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}
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(span.start() - a)..sp.len()
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} else {
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0..sp.len().min(span.end() - a)
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};
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s.push_str(&sp.of(self.src)[r]);
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}
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a = b;
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}
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assert_eq!(span.len(), s.len());
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CowStr::Owned(s)
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}
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fn chars(&self) -> Self::Chars {
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// SAFETY: do not call set_spans while chars is in use
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unsafe { std::mem::transmute(InlineChars::new(self.src, &self.spans)) }
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}
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}
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#[derive(Default)]
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struct InlineSpans<'s> {
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src: &'s str,
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spans: Vec<Span>,
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}
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impl<'s> InlineSpans<'s> {
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fn new(src: &'s str) -> Self {
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Self {
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src,
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spans: Vec::new(),
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}
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}
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fn set_spans(&mut self, spans: impl Iterator<Item = Span>) {
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// avoid allocating new vec if size is sufficient
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self.spans.clear();
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self.spans.extend(spans);
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}
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}
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pub struct Parser<'s> {
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src: &'s str,
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tree: block::Tree,
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inlines: InlineSpans<'s>,
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inline_parser: Option<inline::Parser<InlineChars<'s, 'static>>>,
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inline_start: usize,
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block_attributes: Attributes<'s>,
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}
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impl<'s> Parser<'s> {
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#[must_use]
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pub fn new(src: &'s str) -> Self {
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Self {
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src,
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tree: block::parse(src),
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inlines: InlineSpans::new(src),
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inline_parser: None,
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inline_start: 0,
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block_attributes: Attributes::new(),
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}
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}
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}
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impl<'s> Parser<'s> {
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fn inline(&self, inline: inline::Event) -> Event<'s> {
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match inline.kind {
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inline::EventKind::Enter(c) | inline::EventKind::Exit(c) => {
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let t = match c {
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inline::Container::Span => Container::Span,
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inline::Container::Verbatim => Container::Verbatim,
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inline::Container::InlineMath => Container::Math { display: false },
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inline::Container::DisplayMath => Container::Math { display: true },
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inline::Container::RawFormat => Container::RawInline {
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format: match self.inlines.src(inline.span) {
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CowStr::Owned(_) => panic!(),
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CowStr::Borrowed(s) => s,
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},
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},
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inline::Container::Subscript => Container::Subscript,
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inline::Container::Superscript => Container::Superscript,
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inline::Container::Insert => Container::Insert,
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inline::Container::Delete => Container::Delete,
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inline::Container::Emphasis => Container::Emphasis,
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inline::Container::Strong => Container::Strong,
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inline::Container::Mark => Container::Mark,
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inline::Container::SingleQuoted => Container::SingleQuoted,
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inline::Container::DoubleQuoted => Container::DoubleQuoted,
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inline::Container::InlineLink => Container::Link(
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match self.inlines.src(inline.span) {
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CowStr::Owned(s) => s.replace('\n', "").into(),
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s @ CowStr::Borrowed(_) => s,
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},
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LinkType::Span(SpanLinkType::Inline),
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),
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inline::Container::InlineImage => Container::Image(
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match self.inlines.src(inline.span) {
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CowStr::Owned(s) => s.replace('\n', "").into(),
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s @ CowStr::Borrowed(_) => s,
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},
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SpanLinkType::Inline,
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),
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_ => todo!("{:?}", c),
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};
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if matches!(inline.kind, inline::EventKind::Enter(_)) {
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Event::Start(t, Attributes::new())
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} else {
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Event::End(t)
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}
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}
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inline::EventKind::Atom(a) => match a {
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inline::Atom::Ellipsis => Event::Atom(Atom::Ellipsis),
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inline::Atom::EnDash => Event::Atom(Atom::EnDash),
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inline::Atom::EmDash => Event::Atom(Atom::EmDash),
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inline::Atom::Nbsp => Event::Atom(Atom::NonBreakingSpace),
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inline::Atom::Softbreak => Event::Atom(Atom::Softbreak),
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inline::Atom::Hardbreak => Event::Atom(Atom::Hardbreak),
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inline::Atom::Escape => Event::Atom(Atom::Escape),
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},
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inline::EventKind::Str => Event::Str(self.inlines.src(inline.span)),
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inline::EventKind::Attributes => todo!(),
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}
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}
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}
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impl<'s> Iterator for Parser<'s> {
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type Item = Event<'s>;
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fn next(&mut self) -> Option<Self::Item> {
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if let Some(parser) = &mut self.inline_parser {
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if let Some(inline) = parser.next() {
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// SAFETY: cannot set lifetime 's on self due to trait
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return Some(self.inline(inline));
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}
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self.inline_parser = None;
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}
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for ev in &mut self.tree {
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let content = ev.span.of(self.src);
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let event = match ev.kind {
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tree::EventKind::Atom(a) => match a {
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block::Atom::Blankline => Event::Atom(Atom::Blankline),
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block::Atom::ThematicBreak => Event::Atom(Atom::ThematicBreak),
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block::Atom::Attributes => {
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self.block_attributes.parse(&content);
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dbg!(&self.block_attributes);
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continue;
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}
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},
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tree::EventKind::Enter(c) => match c {
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block::Node::Leaf(l) => {
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self.inlines.set_spans(self.tree.inlines());
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self.inline_parser = Some(inline::Parser::new(self.inlines.chars()));
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self.inline_start = ev.span.end();
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let container = match l {
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block::Leaf::CodeBlock { .. } => {
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self.inline_start += 1; // skip newline
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Container::CodeBlock {
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lang: (!ev.span.is_empty()).then(|| content),
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}
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}
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_ => Container::from_leaf_block(content, l),
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};
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Event::Start(container, self.block_attributes.take())
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}
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block::Node::Container(c) => {
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let container = match c {
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block::Container::Div { .. } => Container::Div {
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class: (!ev.span.is_empty()).then(|| content),
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},
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_ => Container::from_container_block(content, c),
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};
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Event::Start(container, self.block_attributes.take())
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}
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},
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tree::EventKind::Exit(c) => match c {
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block::Node::Leaf(l) => Event::End(Container::from_leaf_block(content, l)),
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block::Node::Container(c) => {
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Event::End(Container::from_container_block(content, c))
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}
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},
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tree::EventKind::Inline => unreachable!(),
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};
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return Some(event);
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}
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None
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}
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}
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#[cfg(test)]
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mod test {
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use super::Atom::*;
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use super::Attributes;
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use super::Container::*;
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use super::CowStr;
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use super::Event::*;
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use super::LinkType;
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use super::SpanLinkType;
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macro_rules! test_parse {
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($src:expr $(,$($token:expr),* $(,)?)?) => {
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#[allow(unused)]
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let actual = super::Parser::new($src).collect::<Vec<_>>();
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let expected = &[$($($token),*,)?];
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assert_eq!(
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actual,
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expected,
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concat!(
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"\n",
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"\x1b[0;1m====================== INPUT =========================\x1b[0m\n",
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"\x1b[2m{}",
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"\x1b[0;1m================ ACTUAL vs EXPECTED ==================\x1b[0m\n",
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"{}",
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"\x1b[0;1m======================================================\x1b[0m\n",
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),
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$src,
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{
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let a = actual.iter().map(|n| format!("{:?}", n)).collect::<Vec<_>>();
|
|
let b = expected.iter().map(|n| format!("{:?}", n)).collect::<Vec<_>>();
|
|
let max = a.len().max(b.len());
|
|
let a_width = a.iter().map(|a| a.len()).max().unwrap_or(0);
|
|
a.iter()
|
|
.map(AsRef::as_ref)
|
|
.chain(std::iter::repeat(""))
|
|
.zip(b.iter().map(AsRef::as_ref).chain(std::iter::repeat("")))
|
|
.take(max)
|
|
.map(|(a, b)|
|
|
format!(
|
|
"\x1b[{}m{:a_width$}\x1b[0m {}= \x1b[{}m{}\x1b[0m\n",
|
|
if a == b { "2" } else { "31" },
|
|
a,
|
|
if a == b { '=' } else { '!' },
|
|
if a == b { "2" } else { "32" },
|
|
b,
|
|
a_width = a_width,
|
|
)
|
|
)
|
|
.collect::<String>()
|
|
},
|
|
);
|
|
};
|
|
}
|
|
|
|
#[test]
|
|
fn empty() {
|
|
test_parse!("");
|
|
}
|
|
|
|
#[test]
|
|
fn heading() {
|
|
test_parse!(
|
|
"#\n",
|
|
Start(Heading { level: 1 }, Attributes::new()),
|
|
End(Heading { level: 1 }),
|
|
);
|
|
test_parse!(
|
|
"# abc\ndef\n",
|
|
Start(Heading { level: 1 }, Attributes::new()),
|
|
Str("abc".into()),
|
|
Atom(Softbreak),
|
|
Str("def".into()),
|
|
End(Heading { level: 1 }),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn blockquote() {
|
|
test_parse!(
|
|
">\n",
|
|
Start(Blockquote, Attributes::new()),
|
|
Atom(Blankline),
|
|
End(Blockquote),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn para() {
|
|
test_parse!(
|
|
"para",
|
|
Start(Paragraph, Attributes::new()),
|
|
Str("para".into()),
|
|
End(Paragraph),
|
|
);
|
|
test_parse!(
|
|
"pa ra",
|
|
Start(Paragraph, Attributes::new()),
|
|
Str("pa ra".into()),
|
|
End(Paragraph),
|
|
);
|
|
test_parse!(
|
|
"para0\n\npara1",
|
|
Start(Paragraph, Attributes::new()),
|
|
Str("para0".into()),
|
|
End(Paragraph),
|
|
Atom(Blankline),
|
|
Start(Paragraph, Attributes::new()),
|
|
Str("para1".into()),
|
|
End(Paragraph),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn verbatim() {
|
|
test_parse!(
|
|
"`abc\ndef",
|
|
Start(Paragraph, Attributes::new()),
|
|
Start(Verbatim, Attributes::new()),
|
|
Str("abc\ndef".into()),
|
|
End(Verbatim),
|
|
End(Paragraph),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"> `abc\n",
|
|
"> def\n", //
|
|
),
|
|
Start(Blockquote, Attributes::new()),
|
|
Start(Paragraph, Attributes::new()),
|
|
Start(Verbatim, Attributes::new()),
|
|
Str("abc\ndef".into()),
|
|
End(Verbatim),
|
|
End(Paragraph),
|
|
End(Blockquote),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn raw_inline() {
|
|
test_parse!(
|
|
"``raw\nraw``{=format}",
|
|
Start(Paragraph, Attributes::new()),
|
|
Start(RawInline { format: "format" }, Attributes::new()),
|
|
Str("raw\nraw".into()),
|
|
End(RawInline { format: "format" }),
|
|
End(Paragraph),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn link_inline() {
|
|
test_parse!(
|
|
"[text](url)",
|
|
Start(Paragraph, Attributes::new()),
|
|
Start(
|
|
Link("url".into(), LinkType::Span(SpanLinkType::Inline)),
|
|
Attributes::new()
|
|
),
|
|
Str("text".into()),
|
|
End(Link("url".into(), LinkType::Span(SpanLinkType::Inline))),
|
|
End(Paragraph),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"> [text](url\n",
|
|
"> url)\n", //
|
|
),
|
|
Start(Blockquote, Attributes::new()),
|
|
Start(Paragraph, Attributes::new()),
|
|
Start(
|
|
Link("urlurl".into(), LinkType::Span(SpanLinkType::Inline)),
|
|
Attributes::new()
|
|
),
|
|
Str("text".into()),
|
|
End(Link("urlurl".into(), LinkType::Span(SpanLinkType::Inline))),
|
|
End(Paragraph),
|
|
End(Blockquote),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn attr_block() {
|
|
test_parse!(
|
|
"{.some_class}\npara\n",
|
|
Start(Paragraph, [("class", "some_class")].into_iter().collect()),
|
|
Str("para".into()),
|
|
End(Paragraph),
|
|
);
|
|
}
|
|
}
|