🎉 initiate project *astro_rewrite*

node_modules/micromark-core-commonmark/dev/lib/thematic-break.js

@@ -0,0 +1,119 @@
+/**
+ * @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'
+import {codes} from 'micromark-util-symbol/codes.js'
+import {constants} from 'micromark-util-symbol/constants.js'
+import {types} from 'micromark-util-symbol/types.js'
+import {ok as assert} from 'uvu/assert'
+
+/** @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(types.thematicBreak)
+    // To do: parse indent like `markdown-rs`.
+    return before(code)
+  }
+
+  /**
+   * After optional whitespace, at marker.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function before(code) {
+    assert(
+      code === codes.asterisk ||
+        code === codes.dash ||
+        code === codes.underscore,
+      'expected `*`, `-`, or `_`'
+    )
+    marker = code
+    return atBreak(code)
+  }
+
+  /**
+   * After something, before something else.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function atBreak(code) {
+    if (code === marker) {
+      effects.enter(types.thematicBreakSequence)
+      return sequence(code)
+    }
+
+    if (
+      size >= constants.thematicBreakMarkerCountMin &&
+      (code === codes.eof || markdownLineEnding(code))
+    ) {
+      effects.exit(types.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(types.thematicBreakSequence)
+    return markdownSpace(code)
+      ? factorySpace(effects, atBreak, types.whitespace)(code)
+      : atBreak(code)
+  }
+}