Add containerPhrasing, containerFlow helpers on state

lib/handle/blockquote.js

@@ -6,7 +6,6 @@
  * @typedef {import('../types.js').Map} Map
  */
 
-import {containerFlow} from '../util/container-flow.js'
 import {track} from '../util/track.js'
 
 /**
@@ -22,7 +21,7 @@ export function blockquote(node, _, state, info) {
   tracker.move('> ')
   tracker.shift(2)
   const value = state.indentLines(
-    containerFlow(node, state, tracker.current()),
+    state.containerFlow(node, tracker.current()),
     map
   )
   exit()

lib/handle/emphasis.js

@@ -6,7 +6,6 @@
  */
 
 import {checkEmphasis} from '../util/check-emphasis.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 import {track} from '../util/track.js'
 
 emphasis.peek = emphasisPeek
@@ -28,7 +27,7 @@ export function emphasis(node, _, state, info) {
   const tracker = track(info)
   let value = tracker.move(marker)
   value += tracker.move(
-    containerPhrasing(node, state, {
+    state.containerPhrasing(node, {
       before: value,
       after: marker,
       ...tracker.current()

lib/handle/heading.js

@@ -6,7 +6,6 @@
  */
 
 import {formatHeadingAsSetext} from '../util/format-heading-as-setext.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 import {track} from '../util/track.js'
 
 /**
@@ -23,7 +22,7 @@ export function heading(node, _, state, info) {
   if (formatHeadingAsSetext(node, state)) {
     const exit = state.enter('headingSetext')
     const subexit = state.enter('phrasing')
-    const value = containerPhrasing(node, state, {
+    const value = state.containerPhrasing(node, {
       ...tracker.current(),
       before: '\n',
       after: '\n'
@@ -54,7 +53,7 @@ export function heading(node, _, state, info) {
   // we’ve tracked one too many characters.
   tracker.move(sequence + ' ')
 
-  let value = containerPhrasing(node, state, {
+  let value = state.containerPhrasing(node, {
     before: '# ',
     after: '\n',
     ...tracker.current()

lib/handle/link-reference.js

@@ -6,7 +6,6 @@
  */
 
 import {association} from '../util/association.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 import {safe} from '../util/safe.js'
 import {track} from '../util/track.js'
 
@@ -25,7 +24,7 @@ export function linkReference(node, _, state, info) {
   let subexit = state.enter('label')
   const tracker = track(info)
   let value = tracker.move('[')
-  const text = containerPhrasing(node, state, {
+  const text = state.containerPhrasing(node, {
     before: value,
     after: ']',
     ...tracker.current()

lib/handle/link.js

@@ -8,7 +8,6 @@
 
 import {checkQuote} from '../util/check-quote.js'
 import {formatLinkAsAutolink} from '../util/format-link-as-autolink.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 import {safe} from '../util/safe.js'
 import {track} from '../util/track.js'
 
@@ -37,7 +36,7 @@ export function link(node, _, state, info) {
     exit = state.enter('autolink')
     let value = tracker.move('<')
     value += tracker.move(
-      containerPhrasing(node, state, {
+      state.containerPhrasing(node, {
         before: value,
         after: '>',
         ...tracker.current()
@@ -53,7 +52,7 @@ export function link(node, _, state, info) {
   subexit = state.enter('label')
   let value = tracker.move('[')
   value += tracker.move(
-    containerPhrasing(node, state, {
+    state.containerPhrasing(node, {
       before: value,
       after: '](',
       ...tracker.current()

lib/handle/list-item.js

@@ -8,7 +8,6 @@
 
 import {checkBullet} from '../util/check-bullet.js'
 import {checkListItemIndent} from '../util/check-list-item-indent.js'
-import {containerFlow} from '../util/container-flow.js'
 import {track} from '../util/track.js'
 
 /**
@@ -49,7 +48,7 @@ export function listItem(node, parent, state, info) {
   tracker.shift(size)
   const exit = state.enter('listItem')
   const value = state.indentLines(
-    containerFlow(node, state, tracker.current()),
+    state.containerFlow(node, tracker.current()),
     map
   )
   exit()

lib/handle/list.js

@@ -5,7 +5,6 @@
  * @typedef {import('../types.js').Info} Info
  */
 
-import {containerFlow} from '../util/container-flow.js'
 import {checkBullet} from '../util/check-bullet.js'
 import {checkBulletOther} from '../util/check-bullet-other.js'
 import {checkBulletOrdered} from '../util/check-bullet-ordered.js'
@@ -106,7 +105,7 @@ export function list(node, parent, state, info) {
   }
 
   state.bulletCurrent = bullet
-  const value = containerFlow(node, state, info)
+  const value = state.containerFlow(node, info)
   state.bulletLastUsed = bullet
   state.bulletCurrent = bulletCurrent
   exit()

lib/handle/paragraph.js

@@ -5,8 +5,6 @@
  * @typedef {import('../types.js').Info} Info
  */
 
-import {containerPhrasing} from '../util/container-phrasing.js'
-
 /**
  * @param {Paragraph} node
  * @param {Parent | undefined} _
@@ -17,7 +15,7 @@ import {containerPhrasing} from '../util/container-phrasing.js'
 export function paragraph(node, _, state, info) {
   const exit = state.enter('paragraph')
   const subexit = state.enter('phrasing')
-  const value = containerPhrasing(node, state, info)
+  const value = state.containerPhrasing(node, info)
   subexit()
   exit()
   return value

lib/handle/root.js

@@ -6,8 +6,6 @@
  */
 
 import {phrasing} from 'mdast-util-phrasing'
-import {containerFlow} from '../util/container-flow.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 
 /**
  * @param {Root} node
@@ -19,7 +17,7 @@ import {containerPhrasing} from '../util/container-phrasing.js'
 export function root(node, _, state, info) {
   // Note: `html` nodes are ambiguous.
   const hasPhrasing = node.children.some((d) => phrasing(d))
-  const fn = hasPhrasing ? containerPhrasing : containerFlow
+  const fn = hasPhrasing ? state.containerPhrasing : state.containerFlow
   // @ts-expect-error: `root`s are supposed to have one type of content
-  return fn(node, state, info)
+  return fn.call(state, node, info)
 }

lib/handle/strong.js

@@ -6,7 +6,6 @@
  */
 
 import {checkStrong} from '../util/check-strong.js'
-import {containerPhrasing} from '../util/container-phrasing.js'
 import {track} from '../util/track.js'
 
 strong.peek = strongPeek
@@ -28,7 +27,7 @@ export function strong(node, _, state, info) {
   const tracker = track(info)
   let value = tracker.move(marker + marker)
   value += tracker.move(
-    containerPhrasing(node, state, {
+    state.containerPhrasing(node, {
       before: value,
       after: marker,
       ...tracker.current()

lib/index.js

@@ -1,16 +1,23 @@
 /**
+ * @typedef {import('./types.js').Enter} Enter
+ * @typedef {import('./types.js').Info} Info
+ * @typedef {import('./types.js').Join} Join
+ * @typedef {import('./types.js').FlowContent} FlowContent
  * @typedef {import('./types.js').Node} Node
  * @typedef {import('./types.js').Options} Options
+ * @typedef {import('./types.js').Parent} Parent
+ * @typedef {import('./types.js').PhrasingContent} PhrasingContent
  * @typedef {import('./types.js').State} State
- * @typedef {import('./types.js').Join} Join
- * @typedef {import('./types.js').Enter} Enter
+ * @typedef {import('./types.js').TrackFields} TrackFields
  */
 
 import {zwitch} from 'zwitch'
 import {configure} from './configure.js'
 import {handle as handlers} from './handle/index.js'
 import {join} from './join.js'
 import {unsafe} from './unsafe.js'
+import {containerPhrasing} from './util/container-phrasing.js'
+import {containerFlow} from './util/container-flow.js'
 import {indentLines} from './util/indent-lines.js'
 
 /**
@@ -28,6 +35,8 @@ export function toMarkdown(tree, options = {}) {
   const state = {
     enter,
     indentLines,
+    containerPhrasing: containerPhrasingBound,
+    containerFlow: containerFlowBound,
     stack: [],
     unsafe: [],
     join: [],
@@ -104,3 +113,40 @@ function joinDefinition(left, right) {
     return 0
   }
 }
+
+/**
+ * Serialize the children of a parent that contains phrasing children.
+ *
+ * These children will be joined flush together.
+ *
+ * @this {State}
+ *   Info passed around about the current state.
+ * @param {Parent & {children: Array<PhrasingContent>}} parent
+ *   Parent of flow nodes.
+ * @param {Info} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined together.
+ */
+function containerPhrasingBound(parent, info) {
+  return containerPhrasing(parent, this, info)
+}
+
+/**
+ * Serialize the children of a parent that contains flow children.
+ *
+ * These children will typically be joined by blank lines.
+ * What they are joined by exactly is defined by `Join` functions.
+ *
+ * @this {State}
+ *   Info passed around about the current state.
+ * @param {Parent & {children: Array<FlowContent>}} parent
+ *   Parent of flow nodes.
+ * @param {TrackFields} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined by (blank) lines.
+ */
+function containerFlowBound(parent, info) {
+  return containerFlow(parent, this, info)
+}

lib/types.js

@@ -43,7 +43,6 @@
  * @returns {string}
  *   Padded line.
  *
-
  * @callback IndentLines
  *   Pad serialized markdown.
  * @param {string} value
@@ -53,6 +52,29 @@
  * @returns {string}
  *   Padded value.
  *
+ * @callback ContainerPhrasing
+ *   Serialize the children of a parent that contains phrasing children.
+ *
+ *   These children will be joined flush together.
+ * @param {Parent & {children: Array<PhrasingContent>}} parent
+ *   Parent of flow nodes.
+ * @param {Info} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined together.
+ *
+ * @callback ContainerFlow
+ *   Serialize the children of a parent that contains flow children.
+ *
+ *   These children will typically be joined by blank lines.
+ *   What they are joined by exactly is defined by `Join` functions.
+ * @param {Parent & {children: Array<FlowContent>}} parent
+ *   Parent of flow nodes.
+ * @param {TrackFields} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined by (blank) lines.
+ *
  * @callback Enter
  *   Enter something.
  * @param {ConstructName} name
@@ -73,6 +95,10 @@
  *   Positions of child nodes in their parents.
  * @property {IndentLines} indentLines
  *   Pad serialized markdown.
+ * @property {ContainerPhrasing} containerPhrasing
+ *   Serialize the children of a parent that contains phrasing children.
+ * @property {ContainerFlow} containerFlow
+ *   Serialize the children of a parent that contains flow children.
  * @property {Enter} enter
  *   Enter a construct (returns a corresponding exit function).
  * @property {Options} options

lib/util/container-flow.js

@@ -10,9 +10,13 @@ import {track} from './track.js'
 
 /**
  * @param {Parent & {children: Array<FlowContent>}} parent
+ *   Parent of flow nodes.
  * @param {State} state
+ *   Info passed around about the current state.
  * @param {TrackFields} info
+ *   Info on where we are in the document we are generating.
  * @returns {string}
+ *   Serialized children, joined by (blank) lines.
  */
 export function containerFlow(parent, state, info) {
   const indexStack = state.indexStack
@@ -44,38 +48,42 @@ export function containerFlow(parent, state, info) {
     }
 
     if (index < children.length - 1) {
-      results.push(tracker.move(between(child, children[index + 1])))
+      results.push(
+        tracker.move(between(child, children[index + 1], parent, state))
+      )
     }
   }
 
   indexStack.pop()
 
   return results.join('')
+}
 
-  /**
-   * @param {Node} left
-   * @param {Node} right
-   * @returns {string}
-   */
-  function between(left, right) {
-    let index = state.join.length
-
-    while (index--) {
-      const result = state.join[index](left, right, parent, state)
+/**
+ * @param {Node} left
+ * @param {Node} right
+ * @param {Parent} parent
+ * @param {State} state
+ * @returns {string}
+ */
+function between(left, right, parent, state) {
+  let index = state.join.length
 
-      if (result === true || result === 1) {
-        break
-      }
+  while (index--) {
+    const result = state.join[index](left, right, parent, state)
 
-      if (typeof result === 'number') {
-        return '\n'.repeat(1 + result)
-      }
+    if (result === true || result === 1) {
+      break
+    }
 
-      if (result === false) {
-        return '\n\n<!---->\n\n'
-      }
+    if (typeof result === 'number') {
+      return '\n'.repeat(1 + result)
     }
 
-    return '\n\n'
+    if (result === false) {
+      return '\n\n<!---->\n\n'
+    }
   }
+
+  return '\n\n'
 }