fix: alert token also need line offset since it is based on blockquote (#16)

Author: galaxian85

lib/common/utils.js

@@ -290,14 +290,27 @@ function normalizeReference(str) {
 }
 
 function getLineOffset(state) {
-  if (state.env.parentToken.parentType === 'blockquote') {
+  if (isInBlockquote(state)) {
     const blockState = state.env.state_block;
     return blockState.lineOffsets[state.currentLine] ?? 0;
   } else {
     return 0;
   }
 }
 
+function isInBlockquote(state) {
+  let count = 0;
+  for (let i = state.env.parentTokenIndex; i >= 0; i--) {
+    const token = state.env.parentState.tokens[i];
+    if (token.type === 'blockquote_open' || token.type === 'alert_open') {
+      count++;
+    } else if (token.type === 'blockquote_close' || token.type === 'alert_close') {
+      count--;
+    }
+  }
+  return count > 0;
+}
+
 function trimLeftOffset(str) {
   return str.length - str.trimLeft().length;
 }