1 files changed, 127 insertions, 0 deletions
diff --git a/packages/markdown-it-14.1.0/lib/rules_inline/strikethrough.mjs b/packages/markdown-it-14.1.0/lib/rules_inline/strikethrough.mjs
new file mode 100644
index 0000000..45f3c1b
--- /dev/null
+++ b/packages/markdown-it-14.1.0/lib/rules_inline/strikethrough.mjs
@@ -0,0 +1,127 @@
+// ~~strike through~~
+//
+
+// Insert each marker as a separate text token, and add it to delimiter list
+//
+function strikethrough_tokenize (state, silent) {
+  const start = state.pos
+  const marker = state.src.charCodeAt(start)
+
+  if (silent) { return false }
+
+  if (marker !== 0x7E/* ~ */) { return false }
+
+  const scanned = state.scanDelims(state.pos, true)
+  let len = scanned.length
+  const ch = String.fromCharCode(marker)
+
+  if (len < 2) { return false }
+
+  let token
+
+  if (len % 2) {
+    token         = state.push('text', '', 0)
+    token.content = ch
+    len--
+  }
+
+  for (let i = 0; i < len; i += 2) {
+    token         = state.push('text', '', 0)
+    token.content = ch + ch
+
+    state.delimiters.push({
+      marker,
+      length: 0,     // disable "rule of 3" length checks meant for emphasis
+      token: state.tokens.length - 1,
+      end: -1,
+      open: scanned.can_open,
+      close: scanned.can_close
+    })
+  }
+
+  state.pos += scanned.length
+
+  return true
+}
+
+function postProcess (state, delimiters) {
+  let token
+  const loneMarkers = []
+  const max = delimiters.length
+
+  for (let i = 0; i < max; i++) {
+    const startDelim = delimiters[i]
+
+    if (startDelim.marker !== 0x7E/* ~ */) {
+      continue
+    }
+
+    if (startDelim.end === -1) {
+      continue
+    }
+
+    const endDelim = delimiters[startDelim.end]
+
+    token         = state.tokens[startDelim.token]
+    token.type    = 's_open'
+    token.tag     = 's'
+    token.nesting = 1
+    token.markup  = '~~'
+    token.content = ''
+
+    token         = state.tokens[endDelim.token]
+    token.type    = 's_close'
+    token.tag     = 's'
+    token.nesting = -1
+    token.markup  = '~~'
+    token.content = ''
+
+    if (state.tokens[endDelim.token - 1].type === 'text' &&
+        state.tokens[endDelim.token - 1].content === '~') {
+      loneMarkers.push(endDelim.token - 1)
+    }
+  }
+
+  // If a marker sequence has an odd number of characters, it's splitted
+  // like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
+  // start of the sequence.
+  //
+  // So, we have to move all those markers after subsequent s_close tags.
+  //
+  while (loneMarkers.length) {
+    const i = loneMarkers.pop()
+    let j = i + 1
+
+    while (j < state.tokens.length && state.tokens[j].type === 's_close') {
+      j++
+    }
+
+    j--
+
+    if (i !== j) {
+      token = state.tokens[j]
+      state.tokens[j] = state.tokens[i]
+      state.tokens[i] = token
+    }
+  }
+}
+
+// Walk through delimiter list and replace text tokens with tags
+//
+function strikethrough_postProcess (state) {
+  const tokens_meta = state.tokens_meta
+  const max = state.tokens_meta.length
+
+  postProcess(state, state.delimiters)
+
+  for (let curr = 0; curr < max; curr++) {
+    if (tokens_meta[curr] && tokens_meta[curr].delimiters) {
+      postProcess(state, tokens_meta[curr].delimiters)
+    }
+  }
+}
+
+export default {
+  tokenize: strikethrough_tokenize,
+  postProcess: strikethrough_postProcess
+}