diff --git a/check.sh b/check.sh
new file mode 100644
index 00000000..e4a33528
--- /dev/null
+++ b/check.sh
@@ -0,0 +1,4 @@
+isort .
+black .
+mypy --strict .
+pytest .
diff --git a/src/generator/tl_parser/__init__.py b/src/generator/tl_parser/__init__.py
new file mode 100644
index 00000000..68a94be1
--- /dev/null
+++ b/src/generator/tl_parser/__init__.py
@@ -0,0 +1,20 @@
+from ._impl.tl.definition import Definition
+from ._impl.tl.flag import Flag
+from ._impl.tl.parameter import Parameter, TypeDefNotImplemented
+from ._impl.tl.parameter_type import FlagsParameter, NormalParameter
+from ._impl.tl.ty import Type
+from ._impl.tl_iterator import FunctionDef, TypeDef
+from ._impl.tl_iterator import iterate as parse_tl_file
+
+__all__ = [
+    "Definition",
+    "Flag",
+    "Parameter",
+    "TypeDefNotImplemented",
+    "FlagsParameter",
+    "NormalParameter",
+    "Type",
+    "FunctionDef",
+    "TypeDef",
+    "parse_tl_file",
+]
diff --git a/src/generator/tl_parser/_impl/__init__.py b/src/generator/tl_parser/_impl/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/src/generator/tl_parser/_impl/tl/__init__.py b/src/generator/tl_parser/_impl/tl/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/src/generator/tl_parser/_impl/tl/definition.py b/src/generator/tl_parser/_impl/tl/definition.py
new file mode 100644
index 00000000..b18ee320
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/definition.py
@@ -0,0 +1,118 @@
+from dataclasses import dataclass
+from typing import List, Self, Set
+
+from ..utils import infer_id
+from .parameter import Parameter, TypeDefNotImplemented
+from .parameter_type import FlagsParameter, NormalParameter
+from .ty import Type
+
+
+@dataclass
+class Definition:
+    namespace: List[str]
+    name: str
+    id: int
+    params: List[Parameter]
+    ty: Type
+
+    @classmethod
+    def from_str(cls, definition: str) -> Self:
+        if not definition or definition.isspace():
+            raise ValueError("empty")
+
+        parts = definition.split("=")
+        if len(parts) < 2:
+            raise ValueError("missing type")
+
+        left, ty_str, *_ = map(str.strip, parts)
+        try:
+            ty = Type.from_str(ty_str)
+        except ValueError as e:
+            if e.args[0] == "empty":
+                raise ValueError("missing type")
+            else:
+                raise
+
+        if (pos := left.find(" ")) != -1:
+            name, middle = left[:pos], left[pos:].strip()
+        else:
+            name, middle = left.strip(), ""
+
+        parts = name.split("#")
+        if len(parts) < 2:
+            name, id_str = parts[0], None
+        else:
+            name, id_str, *_ = parts
+
+        namespace = name.split(".")
+        if not all(namespace):
+            raise ValueError("missing name")
+
+        name = namespace.pop()
+
+        if id_str is None:
+            id = infer_id(definition)
+        else:
+            try:
+                id = int(id_str, 16)
+            except ValueError:
+                raise ValueError("invalid id")
+
+        type_defs: List[str] = []
+        flag_defs = []
+        params = []
+
+        for param_str in middle.split():
+            try:
+                param = Parameter.from_str(param_str)
+            except TypeDefNotImplemented as e:
+                type_defs.append(e.name)
+                continue
+
+            if isinstance(param.ty, FlagsParameter):
+                flag_defs.append(param.name)
+            elif not isinstance(param.ty, NormalParameter):
+                raise NotImplementedError
+            elif param.ty.ty.generic_ref and param.ty.ty.name not in type_defs:
+                raise ValueError("missing def")
+            elif param.ty.flag and param.ty.flag.name not in flag_defs:
+                raise ValueError("missing def")
+
+            params.append(param)
+
+        if ty.name in type_defs:
+            ty.generic_ref = True
+
+        return cls(
+            namespace=namespace,
+            name=name,
+            id=id,
+            params=params,
+            ty=ty,
+        )
+
+    @property
+    def full_name(self) -> str:
+        ns = ".".join(self.namespace) + "." if self.namespace else ""
+        return f"{ns}{self.name}"
+
+    def __str__(self) -> str:
+        res = ""
+        for ns in self.namespace:
+            res += f"{ns}."
+        res += f"{self.name}#{self.id:x}"
+
+        def_set: Set[str] = set()
+        for param in self.params:
+            if isinstance(param.ty, NormalParameter):
+                def_set.update(param.ty.ty.find_generic_refs())
+
+        type_defs = list(sorted(def_set))
+        for type_def in type_defs:
+            res += f" {{{type_def}:Type}}"
+
+        for param in self.params:
+            res += f" {param}"
+
+        res += f" = {self.ty}"
+        return res
diff --git a/src/generator/tl_parser/_impl/tl/definition_test.py b/src/generator/tl_parser/_impl/tl/definition_test.py
new file mode 100644
index 00000000..d8f2fcea
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/definition_test.py
@@ -0,0 +1,198 @@
+from pytest import mark, raises
+
+from .definition import Definition
+from .flag import Flag
+from .parameter import Parameter
+from .parameter_type import FlagsParameter, NormalParameter
+from .ty import Type
+
+
+def test_parse_empty_def() -> None:
+    with raises(ValueError) as e:
+        Definition.from_str("")
+    e.match("empty")
+
+
+@mark.parametrize("defn", ["foo#bar = baz", "foo#? = baz", "foo# = baz"])
+def test_parse_bad_id(defn: str) -> None:
+    with raises(ValueError) as e:
+        Definition.from_str(defn)
+    e.match("invalid id")
+
+
+def test_parse_no_name() -> None:
+    with raises(ValueError) as e:
+        Definition.from_str(" = foo")
+    e.match("missing name")
+
+
+@mark.parametrize("defn", ["foo", "foo ="])
+def test_parse_no_type(defn: str) -> None:
+    with raises(ValueError) as e:
+        Definition.from_str(defn)
+    e.match("missing type")
+
+
+def test_parse_unimplemented() -> None:
+    with raises(ValueError) as e:
+        Definition.from_str("int ? = Int")
+    e.match("not implemented")
+
+
+@mark.parametrize(
+    ("defn", "id"),
+    [
+        (
+            "rpc_answer_dropped msg_id:long seq_no:int bytes:int = RpcDropAnswer",
+            0xA43AD8B7,
+        ),
+        (
+            "rpc_answer_dropped#123456 msg_id:long seq_no:int bytes:int = RpcDropAnswer",
+            0x123456,
+        ),
+    ],
+)
+def test_parse_override_id(defn: str, id: int) -> None:
+    assert Definition.from_str(defn).id == id
+
+
+def test_parse_valid_definition() -> None:
+    defn = Definition.from_str("a#1=d")
+    assert defn.name == "a"
+    assert defn.id == 1
+    assert len(defn.params) == 0
+    assert defn.ty == Type(
+        namespace=[],
+        name="d",
+        bare=True,
+        generic_ref=False,
+        generic_arg=None,
+    )
+
+    defn = Definition.from_str("a=d<e>")
+    assert defn.name == "a"
+    assert defn.id != 0
+    assert len(defn.params) == 0
+    assert defn.ty == Type(
+        namespace=[],
+        name="d",
+        bare=True,
+        generic_ref=False,
+        generic_arg=Type.from_str("e"),
+    )
+
+    defn = Definition.from_str("a b:c = d")
+    assert defn.name == "a"
+    assert defn.id != 0
+    assert len(defn.params) == 1
+    assert defn.ty == Type(
+        namespace=[],
+        name="d",
+        bare=True,
+        generic_ref=False,
+        generic_arg=None,
+    )
+
+    defn = Definition.from_str("a#1 {b:Type} c:!b = d")
+    assert defn.name, "a"
+    assert defn.id, 1
+    assert len(defn.params), 1
+    assert isinstance(defn.params[0].ty, NormalParameter)
+    assert defn.params[0].ty.ty.generic_ref
+    assert defn.ty == Type(
+        namespace=[],
+        name="d",
+        bare=True,
+        generic_ref=False,
+        generic_arg=None,
+    )
+
+
+def test_parse_multiline_definition() -> None:
+    defn = """
+        first#1 lol:param
+            = t;
+        """
+
+    assert Definition.from_str(defn).id, 1
+
+    defn = """
+        second#2
+            lol:String
+        = t;
+        """
+
+    assert Definition.from_str(defn).id, 2
+
+    defn = """
+        third#3
+
+            lol:String
+
+        =
+                    t;
+        """
+
+    assert Definition.from_str(defn).id, 3
+
+
+def test_parse_complete() -> None:
+    defn = "ns1.name#123 {X:Type} flags:# pname:flags.10?ns2.Vector<!X> = ns3.Type"
+    assert Definition.from_str(defn) == Definition(
+        namespace=["ns1"],
+        name="name",
+        id=0x123,
+        params=[
+            Parameter(
+                name="flags",
+                ty=FlagsParameter(),
+            ),
+            Parameter(
+                name="pname",
+                ty=NormalParameter(
+                    ty=Type(
+                        namespace=["ns2"],
+                        name="Vector",
+                        bare=False,
+                        generic_ref=False,
+                        generic_arg=Type(
+                            namespace=[],
+                            name="X",
+                            bare=False,
+                            generic_ref=True,
+                            generic_arg=None,
+                        ),
+                    ),
+                    flag=Flag(name="flags", index=10),
+                ),
+            ),
+        ],
+        ty=Type(
+            namespace=["ns3"],
+            name="Type",
+            bare=False,
+            generic_ref=False,
+            generic_arg=None,
+        ),
+    )
+
+
+@mark.parametrize(
+    "defn",
+    [
+        "name param:!X = Type",
+        "name {X:Type} param:!Y = Type",
+        "name param:flags.0?true = Type",
+        "name foo:# param:flags.0?true = Type",
+    ],
+)
+def test_parse_missing_def(defn: str) -> None:
+    with raises(ValueError) as e:
+        Definition.from_str(defn)
+
+    e.match("missing def")
+
+
+def test_test_to_string() -> None:
+    defn = "ns1.name#123 {X:Type} flags:# pname:flags.10?ns2.Vector<!X> = ns3.Type"
+    assert str(Definition.from_str(defn)), defn
diff --git a/src/generator/tl_parser/_impl/tl/flag.py b/src/generator/tl_parser/_impl/tl/flag.py
new file mode 100644
index 00000000..23a39c1f
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/flag.py
@@ -0,0 +1,23 @@
+from dataclasses import dataclass
+from typing import Self
+
+
+@dataclass
+class Flag:
+    name: str
+    index: int
+
+    @classmethod
+    def from_str(cls, ty: str) -> Self:
+        if (dot_pos := ty.find(".")) != -1:
+            try:
+                index = int(ty[dot_pos + 1 :])
+            except ValueError:
+                raise ValueError("invalid flag")
+            else:
+                return cls(name=ty[:dot_pos], index=index)
+        else:
+            raise ValueError("invalid flag")
+
+    def __str__(self) -> str:
+        return f"{self.name}.{self.index}"
diff --git a/src/generator/tl_parser/_impl/tl/parameter.py b/src/generator/tl_parser/_impl/tl/parameter.py
new file mode 100644
index 00000000..c32e93df
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/parameter.py
@@ -0,0 +1,40 @@
+from dataclasses import dataclass
+from typing import Self
+
+from .parameter_type import BaseParameter
+
+
+class TypeDefNotImplemented(NotImplementedError):
+    def __init__(self, name: str):
+        super().__init__(f"typedef not implemented: {name}")
+        self.name = name
+
+
+@dataclass
+class Parameter:
+    name: str
+    ty: BaseParameter
+
+    @classmethod
+    def from_str(cls, param: str) -> Self:
+        if param.startswith("{"):
+            if param.endswith(":Type}"):
+                raise TypeDefNotImplemented(param[1 : param.index(":")])
+            else:
+                raise ValueError("missing def")
+
+        parts = param.split(":")
+        if not parts:
+            raise ValueError("empty")
+        elif len(parts) == 1:
+            raise ValueError("not implemented")
+        else:
+            name, ty, *_ = parts
+
+        if not name:
+            raise ValueError("empty")
+
+        return cls(name=name, ty=BaseParameter.from_str(ty))
+
+    def __str__(self) -> str:
+        return f"{self.name}:{self.ty}"
diff --git a/src/generator/tl_parser/_impl/tl/parameter_test.py b/src/generator/tl_parser/_impl/tl/parameter_test.py
new file mode 100644
index 00000000..d491f24b
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/parameter_test.py
@@ -0,0 +1,97 @@
+from pytest import mark, raises
+
+from .flag import Flag
+from .parameter import Parameter, TypeDefNotImplemented
+from .parameter_type import FlagsParameter, NormalParameter
+from .ty import Type
+
+
+@mark.parametrize("param", [":noname", "notype:", ":"])
+def test_empty_param(param: str) -> None:
+    with raises(ValueError) as e:
+        Parameter.from_str(param)
+    e.match("empty")
+
+
+@mark.parametrize("param", ["", "no colon", "colonless"])
+def test_unknown_param(param: str) -> None:
+    with raises(ValueError) as e:
+        Parameter.from_str(param)
+    e.match("not implemented")
+
+
+@mark.parametrize("param", ["foo:bar?", "foo:?bar", "foo:bar?baz", "foo:bar.baz?qux"])
+def test_bad_flags(param: str) -> None:
+    with raises(ValueError) as e:
+        Parameter.from_str(param)
+    e.match("invalid flag")
+
+
+@mark.parametrize("param", ["foo:<bar", "foo:bar<"])
+def test_bad_generics(param: str) -> None:
+    with raises(ValueError) as e:
+        Parameter.from_str(param)
+    e.match("invalid generic")
+
+
+def test_type_def_param() -> None:
+    with raises(TypeDefNotImplemented) as e:
+        Parameter.from_str("{a:Type}")
+    e.match("typedef not implemented: a")
+
+
+def test_unknown_def_param() -> None:
+    with raises(ValueError) as e:
+        Parameter.from_str("{a:foo}")
+    e.match("missing def")
+
+
+def test_valid_param() -> None:
+    assert Parameter.from_str("foo:#") == Parameter(name="foo", ty=FlagsParameter())
+    assert Parameter.from_str("foo:!bar") == Parameter(
+        name="foo",
+        ty=NormalParameter(
+            ty=Type(
+                namespace=[], name="bar", bare=True, generic_ref=True, generic_arg=None
+            ),
+            flag=None,
+        ),
+    )
+    assert Parameter.from_str("foo:bar.1?baz") == Parameter(
+        name="foo",
+        ty=NormalParameter(
+            ty=Type(
+                namespace=[], name="baz", bare=True, generic_ref=False, generic_arg=None
+            ),
+            flag=Flag(
+                name="bar",
+                index=1,
+            ),
+        ),
+    )
+    assert Parameter.from_str("foo:bar<baz>") == Parameter(
+        name="foo",
+        ty=NormalParameter(
+            ty=Type(
+                namespace=[],
+                name="bar",
+                bare=True,
+                generic_ref=False,
+                generic_arg=Type.from_str("baz"),
+            ),
+            flag=None,
+        ),
+    )
+    assert Parameter.from_str("foo:bar.1?baz<qux>") == Parameter(
+        name="foo",
+        ty=NormalParameter(
+            ty=Type(
+                namespace=[],
+                name="baz",
+                bare=True,
+                generic_ref=False,
+                generic_arg=Type.from_str("qux"),
+            ),
+            flag=Flag(name="bar", index=1),
+        ),
+    )
diff --git a/src/generator/tl_parser/_impl/tl/parameter_type.py b/src/generator/tl_parser/_impl/tl/parameter_type.py
new file mode 100644
index 00000000..f7a3c584
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/parameter_type.py
@@ -0,0 +1,39 @@
+from abc import ABC
+from dataclasses import dataclass
+from typing import Optional, Union
+
+from .flag import Flag
+from .ty import Type
+
+
+class BaseParameter(ABC):
+    @staticmethod
+    def from_str(ty: str) -> Union["FlagsParameter", "NormalParameter"]:
+        if not ty:
+            raise ValueError("empty")
+        if ty == "#":
+            return FlagsParameter()
+        if (pos := ty.find("?")) != -1:
+            ty, flag = ty[pos + 1 :], Flag.from_str(ty[:pos])
+        else:
+            flag = None
+        return NormalParameter(ty=Type.from_str(ty), flag=flag)
+
+
+@dataclass
+class FlagsParameter(BaseParameter):
+    def __str__(self) -> str:
+        return "#"
+
+
+@dataclass
+class NormalParameter(BaseParameter):
+    ty: Type
+    flag: Optional[Flag]
+
+    def __str__(self) -> str:
+        res = ""
+        if self.flag is not None:
+            res += f"{self.flag}?"
+        res += str(self.ty)
+        return res
diff --git a/src/generator/tl_parser/_impl/tl/ty.py b/src/generator/tl_parser/_impl/tl/ty.py
new file mode 100644
index 00000000..f8ef4b2d
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/ty.py
@@ -0,0 +1,55 @@
+from dataclasses import dataclass
+from typing import Iterator, List, Optional, Self
+
+
+@dataclass
+class Type:
+    namespace: List[str]
+    name: str
+    bare: bool
+    generic_ref: bool
+    generic_arg: Optional[Self]
+
+    @classmethod
+    def from_str(cls, ty: str) -> Self:
+        stripped = ty.lstrip("!")
+        ty, generic_ref = stripped, stripped != ty
+
+        if (pos := ty.find("<")) != -1:
+            if not ty.endswith(">"):
+                raise ValueError("invalid generic")
+            ty, generic_arg = ty[:pos], Type.from_str(ty[pos + 1 : -1])
+        else:
+            generic_arg = None
+
+        namespace = ty.split(".")
+        if not all(namespace):
+            raise ValueError("empty")
+
+        name = namespace.pop()
+        bare = name[0].islower()
+
+        return cls(
+            namespace=namespace,
+            name=name,
+            bare=bare,
+            generic_ref=generic_ref,
+            generic_arg=generic_arg,
+        )
+
+    def __str__(self) -> str:
+        res = ""
+        for ns in self.namespace:
+            res += f"{ns}."
+        if self.generic_ref:
+            res += "!"
+        res += self.name
+        if self.generic_arg is not None:
+            res += f"<{self.generic_arg}>"
+        return res
+
+    def find_generic_refs(self) -> Iterator[str]:
+        if self.generic_ref:
+            yield self.name
+        if self.generic_arg is not None:
+            yield from self.generic_arg.find_generic_refs()
diff --git a/src/generator/tl_parser/_impl/tl/ty_test.py b/src/generator/tl_parser/_impl/tl/ty_test.py
new file mode 100644
index 00000000..ffb884e5
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl/ty_test.py
@@ -0,0 +1,91 @@
+from typing import Optional
+
+from pytest import mark, raises
+
+from .ty import Type
+
+
+def test_empty_simple() -> None:
+    with raises(ValueError) as e:
+        Type.from_str("")
+    e.match("empty")
+
+
+def test_simple() -> None:
+    assert Type.from_str("foo") == Type(
+        namespace=[], name="foo", bare=True, generic_ref=False, generic_arg=None
+    )
+
+
+@mark.parametrize("ty", [".", "..", ".foo", "foo.", "foo..foo", ".foo."])
+def test_check_empty_namespaced(ty: str) -> None:
+    with raises(ValueError) as e:
+        Type.from_str(ty)
+        e.match("empty")
+
+
+def test_check_namespaced() -> None:
+    assert Type.from_str("foo.bar.baz") == Type(
+        namespace=["foo", "bar"],
+        name="baz",
+        bare=True,
+        generic_ref=False,
+        generic_arg=None,
+    )
+
+
+@mark.parametrize(
+    "ty",
+    [
+        "foo",
+        "Foo.bar",
+        "!bar",
+    ],
+)
+def test_bare(ty: str) -> None:
+    assert Type.from_str(ty).bare
+
+
+@mark.parametrize(
+    "ty",
+    [
+        "Foo",
+        "Foo.Bar",
+        "!foo.Bar",
+    ],
+)
+def test_bare_not(ty: str) -> None:
+    assert not Type.from_str(ty).bare
+
+
+@mark.parametrize(
+    "ty",
+    [
+        "!f",
+        "!Foo",
+        "!X",
+    ],
+)
+def test_generic_ref(ty: str) -> None:
+    assert Type.from_str(ty).generic_ref
+
+
+def test_generic_ref_not() -> None:
+    assert not Type.from_str("f").generic_ref
+
+
+@mark.parametrize(
+    ("ty", "generic"),
+    [
+        ("foo.bar", None),
+        ("foo<bar>", "bar"),
+        ("foo<bar.Baz>", "bar.Baz"),
+        ("foo<!bar.Baz>", "!bar.Baz"),
+        ("foo<bar<baz>>", "bar<baz>"),
+    ],
+)
+def test_generic_arg(ty: str, generic: Optional[str]) -> None:
+    if generic is None:
+        assert Type.from_str(ty).generic_arg is None
+    else:
+        assert Type.from_str(ty).generic_arg == Type.from_str(generic)
diff --git a/src/generator/tl_parser/_impl/tl_iterator.py b/src/generator/tl_parser/_impl/tl_iterator.py
new file mode 100644
index 00000000..e8de44b8
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl_iterator.py
@@ -0,0 +1,47 @@
+from typing import Iterator, Type
+
+from .tl.definition import Definition
+from .utils import remove_tl_comments
+
+DEFINITION_SEP = ";"
+CATEGORY_MARKER = "---"
+FUNCTIONS_SEP = f"{CATEGORY_MARKER}functions---"
+TYPES_SEP = f"{CATEGORY_MARKER}types---"
+
+
+class TypeDef(Definition):
+    pass
+
+
+class FunctionDef(Definition):
+    pass
+
+
+def iterate(contents: str) -> Iterator[TypeDef | FunctionDef | Exception]:
+    contents = remove_tl_comments(contents)
+    index = 0
+    cls: Type[TypeDef] | Type[FunctionDef] = TypeDef
+    while index < len(contents):
+        if (end := contents.find(DEFINITION_SEP, index)) == -1:
+            end = len(contents)
+
+        definition = contents[index:end].strip()
+        index = end + len(DEFINITION_SEP)
+
+        if not definition:
+            continue
+
+        if definition.startswith(CATEGORY_MARKER):
+            if definition.startswith(FUNCTIONS_SEP):
+                cls = FunctionDef
+                definition = definition[len(FUNCTIONS_SEP) :].strip()
+            elif definition.startswith(TYPES_SEP):
+                cls = TypeDef
+                definition = definition[len(FUNCTIONS_SEP) :].strip()
+            else:
+                raise ValueError("bad separator")
+
+        try:
+            yield cls.from_str(definition)
+        except Exception as e:
+            yield e
diff --git a/src/generator/tl_parser/_impl/tl_iterator_test.py b/src/generator/tl_parser/_impl/tl_iterator_test.py
new file mode 100644
index 00000000..53ea1c95
--- /dev/null
+++ b/src/generator/tl_parser/_impl/tl_iterator_test.py
@@ -0,0 +1,29 @@
+from pytest import raises
+
+from .tl_iterator import FunctionDef, TypeDef, iterate
+
+
+def test_parse_bad_separator() -> None:
+    with raises(ValueError) as e:
+        for _ in iterate("---foo---"):
+            pass
+    e.match("bad separator")
+
+
+def test_parse_file() -> None:
+    items = list(
+        iterate(
+            """
+            // leading; comment
+            first#1 = t; // inline comment
+            ---functions---
+            second and bad;
+            third#3 = t;
+            // trailing comment
+            """
+        )
+    )
+    assert len(items) == 3
+    assert isinstance(items[0], TypeDef) and items[0].id == 1
+    assert isinstance(items[1], ValueError)
+    assert isinstance(items[2], FunctionDef) and items[2].id == 3
diff --git a/src/generator/tl_parser/_impl/utils.py b/src/generator/tl_parser/_impl/utils.py
new file mode 100644
index 00000000..ca4e160f
--- /dev/null
+++ b/src/generator/tl_parser/_impl/utils.py
@@ -0,0 +1,20 @@
+import re
+import zlib
+
+
+def remove_tl_comments(contents: str) -> str:
+    return re.sub(r"//[^\n]*(?=\n)", "", contents)
+
+
+def infer_id(definition: str) -> int:
+    representation = (
+        definition.replace(":bytes ", ": string")
+        .replace("?bytes ", "? string")
+        .replace("<", " ")
+        .replace(">", "")
+        .replace("{", "")
+        .replace("}", "")
+    )
+
+    representation = re.sub(r" \w+:flags\.\d+\?true", "", representation)
+    return zlib.crc32(representation.encode("ascii"))
diff --git a/src/generator/tl_parser/_impl/utils_test.py b/src/generator/tl_parser/_impl/utils_test.py
new file mode 100644
index 00000000..cbbbb8f7
--- /dev/null
+++ b/src/generator/tl_parser/_impl/utils_test.py
@@ -0,0 +1,41 @@
+from .utils import infer_id, remove_tl_comments
+
+
+def test_remove_comments_noop() -> None:
+    data = "hello\nworld"
+    assert remove_tl_comments(data) == data
+
+    data = " \nhello\nworld\n "
+    assert remove_tl_comments(data) == data
+
+
+def test_remove_comments_leading() -> None:
+    input = " // hello\n world "
+    expected = " \n world "
+    assert remove_tl_comments(input) == expected
+
+
+def test_remove_comments_trailing() -> None:
+    input = " \nhello \n // world \n \n "
+    expected = " \nhello \n \n \n "
+    assert remove_tl_comments(input) == expected
+
+
+def test_remove_comments_many() -> None:
+    input = "no\n//yes\nno\n//yes\nno\n"
+    expected = "no\n\nno\n\nno\n"
+    assert remove_tl_comments(input) == expected
+
+
+def test_check_infer_id() -> None:
+    defn = "rpc_answer_dropped msg_id:long seq_no:int bytes:int = RpcDropAnswer"
+    assert infer_id(defn) == 0xA43AD8B7
+
+    defn = "msgs_ack msg_ids:Vector<long> = MsgsAck"
+    assert infer_id(defn) == 0x62D6B459
+
+    defn = "invokeAfterMsg {X:Type} msg_id:long query:!X = X"
+    assert infer_id(defn) == 0xCB9F372D
+
+    defn = "inputMessagesFilterPhoneCalls flags:# missed:flags.0?true = MessagesFilter"
+    assert infer_id(defn) == 0x80C99768