Drop support for Python < 3.10 and add additional Ruff rules

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5

example.py

@@ -75,10 +75,10 @@
             "parseDOM": [{"tag": "a[href]"}],
         },
         "em": {
-            "parseDOM": [{"tag": "i"}, {"tag": "em"}, {"style": "font-style=italic"}]
+            "parseDOM": [{"tag": "i"}, {"tag": "em"}, {"style": "font-style=italic"}],
         },
         "strong": {
-            "parseDOM": [{"tag": "strong"}, {"tag": "b"}, {"style": "font-weight"}]
+            "parseDOM": [{"tag": "strong"}, {"tag": "b"}, {"style": "font-weight"}],
         },
         "code": {"parseDOM": [{"tag": "code"}]},
     },

prosemirror/model/content.py

@@ -3,14 +3,11 @@
 from typing import (
     TYPE_CHECKING,
     ClassVar,
-    Dict,
-    List,
     Literal,
     NamedTuple,
     NoReturn,
     Optional,
     TypedDict,
-    Union,
     cast,
 )
 
@@ -32,11 +29,9 @@
 
 class WrapCacheEntry:
     target: "NodeType"
-    computed: Optional[List["NodeType"]]
+    computed: list["NodeType"] | None
 
-    def __init__(
-        self, target: "NodeType", computed: Optional[List["NodeType"]]
-    ) -> None:
+    def __init__(self, target: "NodeType", computed: list["NodeType"] | None) -> None:
         self.target = target
         self.computed = computed
 
@@ -57,16 +52,16 @@
 
     empty: ClassVar["ContentMatch"]
     valid_end: bool
-    next: List[MatchEdge]
-    wrap_cache: List[WrapCacheEntry]
+    next: list[MatchEdge]
+    wrap_cache: list[WrapCacheEntry]
 
     def __init__(self, valid_end: bool) -> None:
         self.valid_end = valid_end
         self.next = []
         self.wrap_cache = []
 
     @classmethod
-    def parse(cls, string: str, node_types: Dict[str, "NodeType"]) -> "ContentMatch":
+    def parse(cls, string: str, node_types: dict[str, "NodeType"]) -> "ContentMatch":
         stream = TokenStream(string, node_types)
         if stream.next() is None:
             return ContentMatch.empty
@@ -84,11 +79,14 @@
         return None
 
     def match_fragment(
-        self, frag: Fragment, start: int = 0, end: Optional[int] = None
+        self,
+        frag: Fragment,
+        start: int = 0,
+        end: int | None = None,
     ) -> Optional["ContentMatch"]:
         if end is None:
             end = frag.child_count
-        cur: Optional["ContentMatch"] = self
+        cur: "ContentMatch" | None = self
         i = start
         while cur and i < end:
             cur = cur.match_type(frag.child(i).type)
@@ -115,11 +113,14 @@
         return False
 
     def fill_before(
-        self, after: Fragment, to_end: bool = False, start_index: int = 0
-    ) -> Optional[Fragment]:
+        self,
+        after: Fragment,
+        to_end: bool = False,
+        start_index: int = 0,
+    ) -> Fragment | None:
         seen = [self]
 
-        def search(match: ContentMatch, types: List["NodeType"]) -> Optional[Fragment]:
+        def search(match: ContentMatch, types: list["NodeType"]) -> Fragment | None:
             nonlocal seen
             finished = match.match_fragment(after, start_index)
             if finished and (not to_end or finished.valid_end):
@@ -138,17 +139,17 @@
 
         return search(self, [])
 
-    def find_wrapping(self, target: "NodeType") -> Optional[List["NodeType"]]:
+    def find_wrapping(self, target: "NodeType") -> list["NodeType"] | None:
         for entry in self.wrap_cache:
             if entry.target.name == target.name:
                 return entry.computed
         computed = self.compute_wrapping(target)
         self.wrap_cache.append(WrapCacheEntry(target, computed))
         return computed
 
-    def compute_wrapping(self, target: "NodeType") -> Optional[List["NodeType"]]:
+    def compute_wrapping(self, target: "NodeType") -> list["NodeType"] | None:
         seen = {}
-        active: List[Active] = [{"match": self, "type": None, "via": None}]
+        active: list[Active] = [{"match": self, "type": None, "via": None}]
         while len(active):
             current = active.pop(0)
             match = current["match"]
@@ -181,7 +182,8 @@
 
     def edge(self, n: int) -> MatchEdge:
         if n >= len(self.next):
-            raise ValueError(f"There's no {n}th edge in this content match")
+            msg = f"There's no {n}th edge in this content match"
+            raise ValueError(msg)
         return self.next[n]
 
     def __str__(self) -> str:
@@ -217,23 +219,23 @@
 
 
 class TokenStream:
-    inline: Optional[bool]
-    tokens: List[str]
+    inline: bool | None
+    tokens: list[str]
 
-    def __init__(self, string: str, node_types: Dict[str, "NodeType"]) -> None:
+    def __init__(self, string: str, node_types: dict[str, "NodeType"]) -> None:
         self.string = string
         self.node_types = node_types
         self.inline = None
         self.pos = 0
         self.tokens = [i for i in TOKEN_REGEX.findall(string) if i.strip()]
 
-    def next(self) -> Optional[str]:
+    def next(self) -> str | None:
         try:
             return self.tokens[self.pos]
         except IndexError:
             return None
 
-    def eat(self, tok: str) -> Union[int, bool]:
+    def eat(self, tok: str) -> int | bool:
         if self.next() == tok:
             pos = self.pos
             self.pos += 1
@@ -242,17 +244,18 @@
             return False
 
     def err(self, str: str) -> NoReturn:
-        raise SyntaxError(f'{str} (in content expression) "{self.string}"')
+        msg = f'{str} (in content expression) "{self.string}"'
+        raise SyntaxError(msg)
 
 
 class ChoiceExpr(TypedDict):
     type: Literal["choice"]
-    exprs: List["Expr"]
+    exprs: list["Expr"]
 
 
 class SeqExpr(TypedDict):
     type: Literal["seq"]
-    exprs: List["Expr"]
+    exprs: list["Expr"]
 
 
 class PlusExpr(TypedDict):
@@ -282,7 +285,7 @@
     value: "NodeType"
 
 
-Expr = Union[ChoiceExpr, SeqExpr, PlusExpr, StarExpr, OptExpr, RangeExpr, NameExpr]
+Expr = ChoiceExpr | SeqExpr | PlusExpr | StarExpr | OptExpr | RangeExpr | NameExpr
 
 
 def parse_expr(stream: TokenStream) -> Expr:
@@ -341,16 +344,13 @@
     min_ = parse_num(stream)
     max_ = min_
     if stream.eat(","):
-        if stream.next() != "}":
-            max_ = parse_num(stream)
-        else:
-            max_ = -1
+        max_ = parse_num(stream) if stream.next() != "}" else -1
     if not stream.eat("}"):
         stream.err("Unclosed braced range")
     return {"type": "range", "min": min_, "max": max_, "expr": expr}
 
 
-def resolve_name(stream: TokenStream, name: str) -> List["NodeType"]:
+def resolve_name(stream: TokenStream, name: str) -> list["NodeType"]:
     types = stream.node_types
     type = types.get(name)
     if type:
@@ -395,39 +395,41 @@
 
 class Edge(TypedDict):
     term: Optional["NodeType"]
-    to: Optional[int]
+    to: int | None
 
 
 def nfa(
     expr: Expr,
-) -> List[List[Edge]]:
-    nfa_: List[List[Edge]] = [[]]
+) -> list[list[Edge]]:
+    nfa_: list[list[Edge]] = [[]]
 
     def node() -> int:
         nonlocal nfa_
         nfa_.append([])
         return len(nfa_) - 1
 
     def edge(
-        from_: int, to: Optional[int] = None, term: Optional["NodeType"] = None
+        from_: int,
+        to: int | None = None,
+        term: Optional["NodeType"] = None,
     ) -> Edge:
         nonlocal nfa_
         edge: Edge = {"term": term, "to": to}
         nfa_[from_].append(edge)
         return edge
 
-    def connect(edges: List[Edge], to: int) -> None:
+    def connect(edges: list[Edge], to: int) -> None:
         for edge in edges:
             edge["to"] = to
 
-    def compile(expr: Expr, from_: int) -> List[Edge]:
+    def compile(expr: Expr, from_: int) -> list[Edge]:
         if expr["type"] == "choice":
             return list(
                 reduce(
                     lambda out, expr: [*out, *compile(expr, from_)],
                     expr["exprs"],
-                    cast(List[Edge], []),
-                )
+                    cast(list[Edge], []),
+                ),
             )
         elif expr["type"] == "seq":
             i = 0
@@ -452,14 +454,14 @@
             return [edge(from_), *compile(expr["expr"], from_)]
         elif expr["type"] == "range":
             cur = from_
-            for i in range(expr["min"]):
+            for _i in range(expr["min"]):
                 next = node()
                 connect(compile(expr["expr"], cur), next)
                 cur = next
             if expr["max"] == -1:
                 connect(compile(expr["expr"], cur), cur)
             else:
-                for i in range(expr["min"], expr["max"]):
+                for _i in range(expr["min"], expr["max"]):
                     next = node()
                     edge(cur, next)
                     connect(compile(expr["expr"], cur), next)
@@ -477,9 +479,9 @@
 
 
 def null_from(
-    nfa: List[List[Edge]],
+    nfa: list[list[Edge]],
     node: int,
-) -> List[int]:
+) -> list[int]:
     result = []
 
     def scan(n: int) -> None:
@@ -499,21 +501,21 @@
 
 class DFAState(NamedTuple):
     state: "NodeType"
-    next: List[int]
+    next: list[int]
 
 
-def dfa(nfa: List[List[Edge]]) -> ContentMatch:
+def dfa(nfa: list[list[Edge]]) -> ContentMatch:
     labeled = {}
 
-    def explore(states: List[int]) -> ContentMatch:
+    def explore(states: list[int]) -> ContentMatch:
         nonlocal labeled
-        out: List[DFAState] = []
+        out: list[DFAState] = []
         for node in states:
             for item in nfa[node]:
                 term, to = item.get("term"), item.get("to")
                 if not term:
                     continue
-                set: Optional[List[int]] = None
+                set: list[int] | None = None
                 for t in out:
                     if t[0] == term:
                         set = t[1]
@@ -530,7 +532,7 @@
             states = out[i][1]
             find_by_key = ",".join(str(s) for s in states)
             state.next.append(
-                MatchEdge(out[i][0], labeled.get(find_by_key) or explore(states))
+                MatchEdge(out[i][0], labeled.get(find_by_key) or explore(states)),
             )
         return state
 
@@ -555,6 +557,6 @@
         if dead:
             stream.err(
                 f'Only non-generatable nodes ({", ".join(nodes)}) in a required '
-                "position (see https://prosemirror.net/docs/guide/#generatable)"
+                "position (see https://prosemirror.net/docs/guide/#generatable)",
             )
         i += 1

prosemirror/model/diff.py

@@ -1,4 +1,4 @@
-from typing import TYPE_CHECKING, Optional, TypedDict
+from typing import TYPE_CHECKING, TypedDict
 
 from prosemirror.utils import text_length
 
@@ -13,7 +13,7 @@ class Diff(TypedDict):
     b: int
 
 
-def find_diff_start(a: "Fragment", b: "Fragment", pos: int) -> Optional[int]:
+def find_diff_start(a: "Fragment", b: "Fragment", pos: int) -> int | None:
     i = 0
     while True:
         if a.child_count == i or b.child_count == i:
@@ -36,7 +36,9 @@ def find_diff_start(a: "Fragment", b: "Fragment", pos: int) -> Optional[int]:
                     (
                         index_a
                         for ((index_a, char_a), (_, char_b)) in zip(
-                            enumerate(child_a.text), enumerate(child_b.text)
+                            enumerate(child_a.text),
+                            enumerate(child_b.text),
+                            strict=True,
                         )
                         if char_a != char_b
                     ),
@@ -52,9 +54,7 @@ def find_diff_start(a: "Fragment", b: "Fragment", pos: int) -> Optional[int]:
         i += 1
 
 
-def find_diff_end(
-    a: "Fragment", b: "Fragment", pos_a: int, pos_b: int
-) -> Optional[Diff]:
+def find_diff_end(a: "Fragment", b: "Fragment", pos_a: int, pos_b: int) -> Diff | None:
     i_a, i_b = a.child_count, b.child_count
     while True:
         if i_a == 0 or i_b == 0:
@@ -94,7 +94,10 @@ def find_diff_end(
 
         if child_a.content.size or child_b.content.size:
             inner = find_diff_end(
-                child_a.content, child_b.content, pos_a - 1, pos_b - 1
+                child_a.content,
+                child_b.content,
+                pos_a - 1,
+                pos_b - 1,
             )
             if inner:
                 return inner