102 lines
2 KiB
JavaScript
102 lines
2 KiB
JavaScript
/**
|
|
* @typedef {import('micromark-util-types').Code} Code
|
|
* @typedef {import('micromark-util-types').Construct} Construct
|
|
* @typedef {import('micromark-util-types').State} State
|
|
* @typedef {import('micromark-util-types').TokenizeContext} TokenizeContext
|
|
* @typedef {import('micromark-util-types').Tokenizer} Tokenizer
|
|
*/
|
|
|
|
import {factorySpace} from 'micromark-factory-space'
|
|
import {markdownLineEnding, markdownSpace} from 'micromark-util-character'
|
|
/** @type {Construct} */
|
|
export const thematicBreak = {
|
|
name: 'thematicBreak',
|
|
tokenize: tokenizeThematicBreak
|
|
}
|
|
|
|
/**
|
|
* @this {TokenizeContext}
|
|
* @type {Tokenizer}
|
|
*/
|
|
function tokenizeThematicBreak(effects, ok, nok) {
|
|
let size = 0
|
|
/** @type {NonNullable<Code>} */
|
|
let marker
|
|
return start
|
|
|
|
/**
|
|
* Start of thematic break.
|
|
*
|
|
* ```markdown
|
|
* > | ***
|
|
* ^
|
|
* ```
|
|
*
|
|
* @type {State}
|
|
*/
|
|
function start(code) {
|
|
effects.enter('thematicBreak')
|
|
// To do: parse indent like `markdown-rs`.
|
|
return before(code)
|
|
}
|
|
|
|
/**
|
|
* After optional whitespace, at marker.
|
|
*
|
|
* ```markdown
|
|
* > | ***
|
|
* ^
|
|
* ```
|
|
*
|
|
* @type {State}
|
|
*/
|
|
function before(code) {
|
|
marker = code
|
|
return atBreak(code)
|
|
}
|
|
|
|
/**
|
|
* After something, before something else.
|
|
*
|
|
* ```markdown
|
|
* > | ***
|
|
* ^
|
|
* ```
|
|
*
|
|
* @type {State}
|
|
*/
|
|
function atBreak(code) {
|
|
if (code === marker) {
|
|
effects.enter('thematicBreakSequence')
|
|
return sequence(code)
|
|
}
|
|
if (size >= 3 && (code === null || markdownLineEnding(code))) {
|
|
effects.exit('thematicBreak')
|
|
return ok(code)
|
|
}
|
|
return nok(code)
|
|
}
|
|
|
|
/**
|
|
* In sequence.
|
|
*
|
|
* ```markdown
|
|
* > | ***
|
|
* ^
|
|
* ```
|
|
*
|
|
* @type {State}
|
|
*/
|
|
function sequence(code) {
|
|
if (code === marker) {
|
|
effects.consume(code)
|
|
size++
|
|
return sequence
|
|
}
|
|
effects.exit('thematicBreakSequence')
|
|
return markdownSpace(code)
|
|
? factorySpace(effects, atBreak, 'whitespace')(code)
|
|
: atBreak(code)
|
|
}
|
|
}
|