1 files changed, 82 insertions, 0 deletions
diff --git a/packages/markdown-it-14.1.0/lib/rules_block/lheading.mjs b/packages/markdown-it-14.1.0/lib/rules_block/lheading.mjs
new file mode 100644
index 0000000..ee3b9a3
--- /dev/null
+++ b/packages/markdown-it-14.1.0/lib/rules_block/lheading.mjs
@@ -0,0 +1,82 @@
+// lheading (---, ===)
+
+export default function lheading (state, startLine, endLine/*, silent */) {
+  const terminatorRules = state.md.block.ruler.getRules('paragraph')
+
+  // if it's indented more than 3 spaces, it should be a code block
+  if (state.sCount[startLine] - state.blkIndent >= 4) { return false }
+
+  const oldParentType = state.parentType
+  state.parentType = 'paragraph' // use paragraph to match terminatorRules
+
+  // jump line-by-line until empty one or EOF
+  let level = 0
+  let marker
+  let nextLine = startLine + 1
+
+  for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
+    // this would be a code block normally, but after paragraph
+    // it's considered a lazy continuation regardless of what's there
+    if (state.sCount[nextLine] - state.blkIndent > 3) { continue }
+
+    //
+    // Check for underline in setext header
+    //
+    if (state.sCount[nextLine] >= state.blkIndent) {
+      let pos = state.bMarks[nextLine] + state.tShift[nextLine]
+      const max = state.eMarks[nextLine]
+
+      if (pos < max) {
+        marker = state.src.charCodeAt(pos)
+
+        if (marker === 0x2D/* - */ || marker === 0x3D/* = */) {
+          pos = state.skipChars(pos, marker)
+          pos = state.skipSpaces(pos)
+
+          if (pos >= max) {
+            level = (marker === 0x3D/* = */ ? 1 : 2)
+            break
+          }
+        }
+      }
+    }
+
+    // quirk for blockquotes, this line should already be checked by that rule
+    if (state.sCount[nextLine] < 0) { continue }
+
+    // Some tags can terminate paragraph without empty line.
+    let terminate = false
+    for (let i = 0, l = terminatorRules.length; i < l; i++) {
+      if (terminatorRules[i](state, nextLine, endLine, true)) {
+        terminate = true
+        break
+      }
+    }
+    if (terminate) { break }
+  }
+
+  if (!level) {
+    // Didn't find valid underline
+    return false
+  }
+
+  const content = state.getLines(startLine, nextLine, state.blkIndent, false).trim()
+
+  state.line = nextLine + 1
+
+  const token_o    = state.push('heading_open', 'h' + String(level), 1)
+  token_o.markup   = String.fromCharCode(marker)
+  token_o.map      = [startLine, state.line]
+
+  const token_i    = state.push('inline', '', 0)
+  token_i.content  = content
+  token_i.map      = [startLine, state.line - 1]
+  token_i.children = []
+
+  const token_c    = state.push('heading_close', 'h' + String(level), -1)
+  token_c.markup   = String.fromCharCode(marker)
+
+  state.parentType = oldParentType
+
+  return true
+}