383 lines
11 KiB
JavaScript
383 lines
11 KiB
JavaScript
/**
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* @typedef {import('micromark-util-types').Construct} Construct
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* @typedef {import('micromark-util-types').ContainerState} ContainerState
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* @typedef {import('micromark-util-types').InitialConstruct} InitialConstruct
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* @typedef {import('micromark-util-types').Initializer} Initializer
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* @typedef {import('micromark-util-types').Point} Point
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* @typedef {import('micromark-util-types').State} State
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* @typedef {import('micromark-util-types').Token} Token
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* @typedef {import('micromark-util-types').TokenizeContext} TokenizeContext
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* @typedef {import('micromark-util-types').Tokenizer} Tokenizer
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*/
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/**
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* @typedef {[Construct, ContainerState]} StackItem
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*/
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import {factorySpace} from 'micromark-factory-space'
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import {markdownLineEnding} from 'micromark-util-character'
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import {splice} from 'micromark-util-chunked'
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/** @type {InitialConstruct} */
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export const document = {
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tokenize: initializeDocument
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}
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/** @type {Construct} */
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const containerConstruct = {
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tokenize: tokenizeContainer
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}
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/**
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* @this {TokenizeContext}
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* @type {Initializer}
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*/
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function initializeDocument(effects) {
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const self = this
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/** @type {Array<StackItem>} */
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const stack = []
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let continued = 0
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/** @type {TokenizeContext | undefined} */
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let childFlow
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/** @type {Token | undefined} */
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let childToken
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/** @type {number} */
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let lineStartOffset
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return start
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/** @type {State} */
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function start(code) {
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// First we iterate through the open blocks, starting with the root
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// document, and descending through last children down to the last open
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// block.
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// Each block imposes a condition that the line must satisfy if the block is
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// to remain open.
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// For example, a block quote requires a `>` character.
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// A paragraph requires a non-blank line.
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// In this phase we may match all or just some of the open blocks.
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// But we cannot close unmatched blocks yet, because we may have a lazy
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// continuation line.
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if (continued < stack.length) {
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const item = stack[continued]
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self.containerState = item[1]
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return effects.attempt(
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item[0].continuation,
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documentContinue,
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checkNewContainers
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)(code)
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}
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// Done.
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return checkNewContainers(code)
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}
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/** @type {State} */
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function documentContinue(code) {
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continued++
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// Note: this field is called `_closeFlow` but it also closes containers.
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// Perhaps a good idea to rename it but it’s already used in the wild by
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// extensions.
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if (self.containerState._closeFlow) {
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self.containerState._closeFlow = undefined
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if (childFlow) {
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closeFlow()
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}
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// Note: this algorithm for moving events around is similar to the
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// algorithm when dealing with lazy lines in `writeToChild`.
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const indexBeforeExits = self.events.length
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let indexBeforeFlow = indexBeforeExits
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/** @type {Point | undefined} */
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let point
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// Find the flow chunk.
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while (indexBeforeFlow--) {
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if (
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self.events[indexBeforeFlow][0] === 'exit' &&
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self.events[indexBeforeFlow][1].type === 'chunkFlow'
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) {
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point = self.events[indexBeforeFlow][1].end
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break
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}
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}
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exitContainers(continued)
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// Fix positions.
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let index = indexBeforeExits
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while (index < self.events.length) {
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self.events[index][1].end = Object.assign({}, point)
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index++
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}
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// Inject the exits earlier (they’re still also at the end).
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splice(
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self.events,
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indexBeforeFlow + 1,
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0,
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self.events.slice(indexBeforeExits)
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)
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// Discard the duplicate exits.
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self.events.length = index
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return checkNewContainers(code)
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}
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return start(code)
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}
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/** @type {State} */
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function checkNewContainers(code) {
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// Next, after consuming the continuation markers for existing blocks, we
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// look for new block starts (e.g. `>` for a block quote).
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// If we encounter a new block start, we close any blocks unmatched in
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// step 1 before creating the new block as a child of the last matched
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// block.
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if (continued === stack.length) {
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// No need to `check` whether there’s a container, of `exitContainers`
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// would be moot.
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// We can instead immediately `attempt` to parse one.
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if (!childFlow) {
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return documentContinued(code)
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}
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// If we have concrete content, such as block HTML or fenced code,
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// we can’t have containers “pierce” into them, so we can immediately
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// start.
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if (childFlow.currentConstruct && childFlow.currentConstruct.concrete) {
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return flowStart(code)
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}
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// If we do have flow, it could still be a blank line,
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// but we’d be interrupting it w/ a new container if there’s a current
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// construct.
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// To do: next major: remove `_gfmTableDynamicInterruptHack` (no longer
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// needed in micromark-extension-gfm-table@1.0.6).
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self.interrupt = Boolean(
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childFlow.currentConstruct && !childFlow._gfmTableDynamicInterruptHack
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)
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}
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// Check if there is a new container.
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self.containerState = {}
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return effects.check(
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containerConstruct,
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thereIsANewContainer,
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thereIsNoNewContainer
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)(code)
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}
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/** @type {State} */
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function thereIsANewContainer(code) {
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if (childFlow) closeFlow()
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exitContainers(continued)
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return documentContinued(code)
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}
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/** @type {State} */
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function thereIsNoNewContainer(code) {
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self.parser.lazy[self.now().line] = continued !== stack.length
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lineStartOffset = self.now().offset
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return flowStart(code)
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}
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/** @type {State} */
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function documentContinued(code) {
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// Try new containers.
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self.containerState = {}
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return effects.attempt(
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containerConstruct,
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containerContinue,
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flowStart
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)(code)
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}
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/** @type {State} */
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function containerContinue(code) {
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continued++
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stack.push([self.currentConstruct, self.containerState])
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// Try another.
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return documentContinued(code)
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}
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/** @type {State} */
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function flowStart(code) {
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if (code === null) {
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if (childFlow) closeFlow()
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exitContainers(0)
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effects.consume(code)
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return
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}
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childFlow = childFlow || self.parser.flow(self.now())
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effects.enter('chunkFlow', {
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contentType: 'flow',
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previous: childToken,
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_tokenizer: childFlow
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})
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return flowContinue(code)
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}
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/** @type {State} */
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function flowContinue(code) {
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if (code === null) {
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writeToChild(effects.exit('chunkFlow'), true)
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exitContainers(0)
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effects.consume(code)
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return
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}
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if (markdownLineEnding(code)) {
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effects.consume(code)
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writeToChild(effects.exit('chunkFlow'))
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// Get ready for the next line.
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continued = 0
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self.interrupt = undefined
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return start
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}
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effects.consume(code)
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return flowContinue
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}
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/**
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* @param {Token} token
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* @param {boolean | undefined} [eof]
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* @returns {undefined}
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*/
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function writeToChild(token, eof) {
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const stream = self.sliceStream(token)
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if (eof) stream.push(null)
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token.previous = childToken
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if (childToken) childToken.next = token
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childToken = token
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childFlow.defineSkip(token.start)
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childFlow.write(stream)
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// Alright, so we just added a lazy line:
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//
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// ```markdown
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// > a
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// b.
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//
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// Or:
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//
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// > ~~~c
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// d
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//
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// Or:
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//
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// > | e |
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// f
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// ```
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//
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// The construct in the second example (fenced code) does not accept lazy
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// lines, so it marked itself as done at the end of its first line, and
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// then the content construct parses `d`.
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// Most constructs in markdown match on the first line: if the first line
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// forms a construct, a non-lazy line can’t “unmake” it.
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//
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// The construct in the third example is potentially a GFM table, and
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// those are *weird*.
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// It *could* be a table, from the first line, if the following line
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// matches a condition.
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// In this case, that second line is lazy, which “unmakes” the first line
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// and turns the whole into one content block.
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//
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// We’ve now parsed the non-lazy and the lazy line, and can figure out
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// whether the lazy line started a new flow block.
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// If it did, we exit the current containers between the two flow blocks.
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if (self.parser.lazy[token.start.line]) {
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let index = childFlow.events.length
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while (index--) {
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if (
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// The token starts before the line ending…
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childFlow.events[index][1].start.offset < lineStartOffset &&
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// …and either is not ended yet…
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(!childFlow.events[index][1].end ||
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// …or ends after it.
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childFlow.events[index][1].end.offset > lineStartOffset)
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) {
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// Exit: there’s still something open, which means it’s a lazy line
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// part of something.
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return
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}
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}
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// Note: this algorithm for moving events around is similar to the
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// algorithm when closing flow in `documentContinue`.
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const indexBeforeExits = self.events.length
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let indexBeforeFlow = indexBeforeExits
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/** @type {boolean | undefined} */
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let seen
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/** @type {Point | undefined} */
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let point
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// Find the previous chunk (the one before the lazy line).
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while (indexBeforeFlow--) {
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if (
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self.events[indexBeforeFlow][0] === 'exit' &&
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self.events[indexBeforeFlow][1].type === 'chunkFlow'
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) {
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if (seen) {
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point = self.events[indexBeforeFlow][1].end
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break
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}
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seen = true
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}
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}
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exitContainers(continued)
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// Fix positions.
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index = indexBeforeExits
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while (index < self.events.length) {
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self.events[index][1].end = Object.assign({}, point)
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index++
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}
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// Inject the exits earlier (they’re still also at the end).
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splice(
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self.events,
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indexBeforeFlow + 1,
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0,
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self.events.slice(indexBeforeExits)
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)
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// Discard the duplicate exits.
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self.events.length = index
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}
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}
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/**
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* @param {number} size
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* @returns {undefined}
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*/
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function exitContainers(size) {
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let index = stack.length
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// Exit open containers.
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while (index-- > size) {
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const entry = stack[index]
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self.containerState = entry[1]
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entry[0].exit.call(self, effects)
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}
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stack.length = size
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}
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function closeFlow() {
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childFlow.write([null])
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childToken = undefined
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childFlow = undefined
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self.containerState._closeFlow = undefined
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}
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}
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/**
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* @this {TokenizeContext}
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* @type {Tokenizer}
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*/
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function tokenizeContainer(effects, ok, nok) {
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// Always populated by defaults.
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return factorySpace(
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effects,
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effects.attempt(this.parser.constructs.document, ok, nok),
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'linePrefix',
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this.parser.constructs.disable.null.includes('codeIndented') ? undefined : 4
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)
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}
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