primo-app/src/libraries/prosemirror/inputrules.js

primo is an all-in-one ide, cms, component library, and static site generator

import {inputRules, wrappingInputRule, textblockTypeInputRule, smartQuotes, emDash, ellipsis} from "prosemirror-inputrules"

// : (NodeType) → InputRule
// Given a blockquote node type, returns an input rule that turns `"> "`
// at the start of a textblock into a blockquote.
function blockQuoteRule(nodeType) {
  return wrappingInputRule(/^\s*>\s$/, nodeType)
}

// : (NodeType) → InputRule
// Given a list node type, returns an input rule that turns a number
// followed by a dot at the start of a textblock into an ordered list.
function orderedListRule(nodeType) {
  return wrappingInputRule(/^(\d+)\.\s$/, nodeType, match => ({order: +match[1]}),
                           (match, node) => node.childCount + node.attrs.order == +match[1])
}

// : (NodeType) → InputRule
// Given a list node type, returns an input rule that turns a bullet
// (dash, plush, or asterisk) at the start of a textblock into a
// bullet list.
function bulletListRule(nodeType) {
  return wrappingInputRule(/^\s*([-+*])\s$/, nodeType)
}

// : (NodeType) → InputRule
// Given a code block node type, returns an input rule that turns a
// textblock starting with three backticks into a code block.
function codeBlockRule(nodeType) {
  return textblockTypeInputRule(/^```$/, nodeType)
}

// : (NodeType, number) → InputRule
// Given a node type and a maximum level, creates an input rule that
// turns up to that number of `#` characters followed by a space at
// the start of a textblock into a heading whose level corresponds to
// the number of `#` signs.
export function headingRule(nodeType, maxLevel) {
  return textblockTypeInputRule(new RegExp("^(#{1," + maxLevel + "})\\s$"),
                                nodeType, match => ({level: match[1].length}))
}

// : (Schema) → Plugin
// A set of input rules for creating the basic block quotes, lists,
// code blocks, and heading.
export function buildInputRules(schema) {
  let rules = smartQuotes.concat(ellipsis, emDash), type
  if (type = schema.nodes.blockquote) rules.push(blockQuoteRule(type))
  if (type = schema.nodes.ordered_list) rules.push(orderedListRule(type))
  if (type = schema.nodes.bullet_list) rules.push(bulletListRule(type))
  if (type = schema.nodes.code_block) rules.push(codeBlockRule(type))
  if (type = schema.nodes.heading) rules.push(headingRule(type, 6))
  return inputRules({rules})
}