@yozora/ast-util

This package contains a collect of utility functions to handle Yozora markdown ast.

Install

npm

npm install --save @yozora/ast-util

Yarn

yarn add @yozora/ast-util

pnpm

pnpm add @yozora/ast-util

Usage

Name	Description
calcDefinitionMap	Traverse yozora ast and generate a link reference definition map.
calcExcerptAst	Generate a excerpt ast from the original ast.
calcFootnoteDefinitionMap	Traverse yozora ast and generate a footnote reference definition map.
calcHeadingToc	Generate heading toc, and update the referenced Heading.identifier simultaneously
calcIdentifierSet	Generate a definition identifier set from Yozora AST.
calcIdentifierFromYastNodes	Generate a link identifier for Node list.
collectDefinitions	Collect link reference definitions in a pre-order traversal.
collectFootnoteDefinitions	Collect footnote reference definitions in a pre-order traversal.
collectNodes	Collect nodes with the specified nodeTypes (or matcher) through pre-order traversal.
defaultUrlResolver	Default url resolver
removePositions	Remove Position from AST (a shallow cloned AST will be created).
replaceFootnotesInReferences	Replace inline footnotes into footnote references and footnote reference definitions (irreversible)
resolveUrlsForAst	Traverse Yozora AST and resolve urls for aim nodes (irreversible)
searchNode	Search a node from Yozora AST in pre-order traversing
shallowCloneAst	Shallow clone the Yozora AST until the match reaches the termination condition.
shallowMutateAstInPostorder	Traverse AST and replace nodes in post-order (immutable).
shallowMutateAstInPreorder	Traverse AST and replace nodes in pre-order (immutable).
traverseAST	Traverse Yozora AST and perform a mutating operation for each matched node

Example

import { ImageType, BlockquoteType } from '@yozora/ast'
import { 
  collectDefinitions,
  collectFootnoteDefinitions,
  calcHeadingToc, 
  shallowMutateAstInPostorder, 
  traverseAST,
} from '@yozora/ast-util'

// Collect definitions.
collectDefinitions(
  root,               // Yozora ast root
  [DefinitionType],   // aim Yast types, optional
  [],                 // preset definitions, optional
)

// Collect footnote definitions.
collectFootnoteDefinitions(
  root,                     // Yozora ast root
  [FootnoteDefinitionType], // aim Yast types, optional
  [],                       // preset footnote definitions, optional
  true,                     // prefer reference type footnotes, optional.
)

// traverse the Yozora AST and set the image title to the image alt
traverseAST(
  root,                           // Yozora ast root
  [ImageType],                    // aim Yast types, required
  (node) => node.title = node.alt // mutating operation, required
)

// traverse the Yozora AST and replace the image to two images.
shallowMutateAstInPostorder(
  root, 
  [ImageType], 
  (node) => [node, node]
)

// Generate heading toc, each toc node's identifier will with the prefix 'custom-identifier-prefix-'.
// The default prefix is 'heading-'
calcHeadingToc(root, 'custom-identifier-prefix-')

// shallow clone the Yozora AST until a blockquote type node with a blockquote 
// type parent and in addition it is not the first child of its parent encountered.
const root2 = shallowCloneAst(
  root, 
  (node, parent, childIndex) => (
    parent.type === BlockquoteType && 
    childIndex > 0 && 
    node.type === BlockquoteType
  )
)

Related

• @yozora/ast
• Sourcecode