🎉 initiate project *astro_rewrite*

node_modules/micromark-core-commonmark/lib/heading-atx.js

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+/**
+ * @typedef {import('micromark-util-types').Construct} Construct
+ * @typedef {import('micromark-util-types').Resolver} Resolver
+ * @typedef {import('micromark-util-types').State} State
+ * @typedef {import('micromark-util-types').Token} Token
+ * @typedef {import('micromark-util-types').TokenizeContext} TokenizeContext
+ * @typedef {import('micromark-util-types').Tokenizer} Tokenizer
+ */
+
+import {factorySpace} from 'micromark-factory-space'
+import {
+  markdownLineEnding,
+  markdownLineEndingOrSpace,
+  markdownSpace
+} from 'micromark-util-character'
+import {splice} from 'micromark-util-chunked'
+/** @type {Construct} */
+export const headingAtx = {
+  name: 'headingAtx',
+  tokenize: tokenizeHeadingAtx,
+  resolve: resolveHeadingAtx
+}
+
+/** @type {Resolver} */
+function resolveHeadingAtx(events, context) {
+  let contentEnd = events.length - 2
+  let contentStart = 3
+  /** @type {Token} */
+  let content
+  /** @type {Token} */
+  let text
+
+  // Prefix whitespace, part of the opening.
+  if (events[contentStart][1].type === 'whitespace') {
+    contentStart += 2
+  }
+
+  // Suffix whitespace, part of the closing.
+  if (
+    contentEnd - 2 > contentStart &&
+    events[contentEnd][1].type === 'whitespace'
+  ) {
+    contentEnd -= 2
+  }
+  if (
+    events[contentEnd][1].type === 'atxHeadingSequence' &&
+    (contentStart === contentEnd - 1 ||
+      (contentEnd - 4 > contentStart &&
+        events[contentEnd - 2][1].type === 'whitespace'))
+  ) {
+    contentEnd -= contentStart + 1 === contentEnd ? 2 : 4
+  }
+  if (contentEnd > contentStart) {
+    content = {
+      type: 'atxHeadingText',
+      start: events[contentStart][1].start,
+      end: events[contentEnd][1].end
+    }
+    text = {
+      type: 'chunkText',
+      start: events[contentStart][1].start,
+      end: events[contentEnd][1].end,
+      contentType: 'text'
+    }
+    splice(events, contentStart, contentEnd - contentStart + 1, [
+      ['enter', content, context],
+      ['enter', text, context],
+      ['exit', text, context],
+      ['exit', content, context]
+    ])
+  }
+  return events
+}
+
+/**
+ * @this {TokenizeContext}
+ * @type {Tokenizer}
+ */
+function tokenizeHeadingAtx(effects, ok, nok) {
+  let size = 0
+  return start
+
+  /**
+   * Start of a heading (atx).
+   *
+   * ```markdown
+   * > | ## aa
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function start(code) {
+    // To do: parse indent like `markdown-rs`.
+    effects.enter('atxHeading')
+    return before(code)
+  }
+
+  /**
+   * After optional whitespace, at `#`.
+   *
+   * ```markdown
+   * > | ## aa
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function before(code) {
+    effects.enter('atxHeadingSequence')
+    return sequenceOpen(code)
+  }
+
+  /**
+   * In opening sequence.
+   *
+   * ```markdown
+   * > | ## aa
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function sequenceOpen(code) {
+    if (code === 35 && size++ < 6) {
+      effects.consume(code)
+      return sequenceOpen
+    }
+
+    // Always at least one `#`.
+    if (code === null || markdownLineEndingOrSpace(code)) {
+      effects.exit('atxHeadingSequence')
+      return atBreak(code)
+    }
+    return nok(code)
+  }
+
+  /**
+   * After something, before something else.
+   *
+   * ```markdown
+   * > | ## aa
+   *       ^
+   * ```
+   *
+   * @type {State}
+   */
+  function atBreak(code) {
+    if (code === 35) {
+      effects.enter('atxHeadingSequence')
+      return sequenceFurther(code)
+    }
+    if (code === null || markdownLineEnding(code)) {
+      effects.exit('atxHeading')
+      // To do: interrupt like `markdown-rs`.
+      // // Feel free to interrupt.
+      // tokenizer.interrupt = false
+      return ok(code)
+    }
+    if (markdownSpace(code)) {
+      return factorySpace(effects, atBreak, 'whitespace')(code)
+    }
+
+    // To do: generate `data` tokens, add the `text` token later.
+    // Needs edit map, see: `markdown.rs`.
+    effects.enter('atxHeadingText')
+    return data(code)
+  }
+
+  /**
+   * In further sequence (after whitespace).
+   *
+   * Could be normal “visible” hashes in the heading or a final sequence.
+   *
+   * ```markdown
+   * > | ## aa ##
+   *           ^
+   * ```
+   *
+   * @type {State}
+   */
+  function sequenceFurther(code) {
+    if (code === 35) {
+      effects.consume(code)
+      return sequenceFurther
+    }
+    effects.exit('atxHeadingSequence')
+    return atBreak(code)
+  }
+
+  /**
+   * In text.
+   *
+   * ```markdown
+   * > | ## aa
+   *        ^
+   * ```
+   *
+   * @type {State}
+   */
+  function data(code) {
+    if (code === null || code === 35 || markdownLineEndingOrSpace(code)) {
+      effects.exit('atxHeadingText')
+      return atBreak(code)
+    }
+    effects.consume(code)
+    return data
+  }
+}