👌 Throw an error if 3rd party plugin doesn't increment line or `pos…

…` counters (previously infinite loop would likely occur)

markdown_it/parser_block.py

@@ -58,6 +58,7 @@ def __init__(self) -> None:
 
     def tokenize(self, state: StateBlock, startLine: int, endLine: int) -> None:
         """Generate tokens for input range."""
+        ok = False
         rules = self.ruler.getRules("")
         line = startLine
         maxNesting = state.md.options.maxNesting
@@ -82,10 +83,19 @@ def tokenize(self, state: StateBlock, startLine: int, endLine: int) -> None:
             # - update `state.line`
             # - update `state.tokens`
             # - return True
+            prevLine = state.line
+
             for rule in rules:
-                if rule(state, line, endLine, False):
+                ok = rule(state, line, endLine, False)
+                if ok:
+                    if prevLine >= state.line:
+                        raise Exception("block rule didn't increment state.line")
                     break
 
+            # this can only happen if user disables paragraph rule
+            if not ok:
+                raise Exception("none of the block rules matched")
+
             # set state.tight if we had an empty line before current tag
             # i.e. latest empty line should not count
             state.tight = not hasEmptyLines

markdown_it/parser_inline.py

@@ -84,6 +84,8 @@ def skipToken(self, state: StateInline) -> None:
                 ok = rule(state, True)
                 state.level -= 1
                 if ok:
+                    if pos >= state.pos:
+                        raise Exception("inline rule didn't increment state.pos")
                     break
         else:
             # Too much nesting, just skip until the end of the paragraph.
@@ -117,11 +119,14 @@ def tokenize(self, state: StateInline) -> None:
             # - update `state.pos`
             # - update `state.tokens`
             # - return true
+            prevPos = state.pos
 
             if state.level < maxNesting:
                 for rule in rules:
                     ok = rule(state, False)
                     if ok:
+                        if prevPos >= state.pos:
+                            raise Exception("inline rule didn't increment state.pos")
                         break
 
             if ok:

markdown_it/port.yaml

@@ -1,7 +1,7 @@
 - package: markdown-it/markdown-it
   version: 13.0.1
-  commit: e843acc9edad115cbf8cf85e676443f01658be08
-  date: May 3, 2022
+  commit: 49ca65bbef067c7dba63468a48c4aee3048607dc
+  date: Sep 26, 2023
   notes:
     - Rename variables that use python built-in names, e.g.
       - `max` -> `maximum`