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ast: Separate validation from properties

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James Westman 2021-10-31 22:51:48 -05:00
parent bfd9daf6a9
commit 53ad4ec69d
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GPG key ID: CE2DBA0ADB654EA6
3 changed files with 125 additions and 113 deletions
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61
gtkblueprinttool/ast.py
View file

@ -31,22 +31,40 @@ from .xml_emitter import XmlEmitter
class UI(AstNode):
""" The AST node for the entire file """
@validate()
@property
def gir(self):
gir = GirContext()
self._gir_errors = []
try:
gir.add_namespace(self.children[GtkDirective][0].gir_namespace)
except CompileError as e:
self._gir_errors.append(e)
for i in self.children[Import]:
try:
gir.add_namespace(i.gir_namespace)
except CompileError as e:
self._gir_errors.append(e)
return gir
@validate()
def gir_errors(self):
# make sure gir is loaded
self.gir
if len(self._gir_errors):
raise MultipleErrors(self._gir_errors)
@validate()
def at_most_one_template(self):
if len(self.children[Template]) > 1:
raise CompileError(f"Only one template may be defined per file, but this file contains {len(self.templates)}",
self.children[Template][1].group.start)
def emit_xml(self, xml: XmlEmitter):
xml.start_tag("interface")
for x in self.children:
@ -56,10 +74,8 @@ class UI(AstNode):
class GtkDirective(AstNode):
@validate("version")
def gir_namespace(self):
if self.tokens["version"] in ["4.0"]:
return get_namespace("Gtk", self.tokens["version"])
else:
def gtk_version(self):
if self.tokens["version"] not in ["4.0"]:
err = CompileError("Only GTK 4 is supported")
if self.version.startswith("4"):
err.hint("Expected the GIR version, not an exact version number. Use `using Gtk 4.0;`.")
@ -67,6 +83,12 @@ class GtkDirective(AstNode):
err.hint("Expected `using Gtk 4.0;`")
raise err
@property
def gir_namespace(self):
return get_namespace("Gtk", self.tokens["version"])
def emit_xml(self, xml: XmlEmitter):
xml.put_self_closing("requires", lib="gtk", version=self.tokens["version"])
@ -79,8 +101,12 @@ class Import(AstNode):
class Template(AstNode):
@validate("namespace", "class_name")
def gir_parent(self):
def gir_parent_exists(self):
if not self.tokens["ignore_gir"]:
self.root.gir.validate_class(self.tokens["class_name"], self.tokens["namespace"])
@property
def gir_parent(self):
return self.root.gir.get_class(self.tokens["class_name"], self.tokens["namespace"])
@ -106,6 +132,11 @@ class Template(AstNode):
class Object(AstNode):
@validate("namespace", "class_name")
def gir_class_exists(self):
if not self.tokens["ignore_gir"]:
self.root.gir.validate_class(self.tokens["class_name"], self.tokens["namespace"])
@property
def gir_class(self):
if not self.tokens["ignore_gir"]:
return self.root.gir.get_class(self.tokens["class_name"], self.tokens["namespace"])
@ -141,7 +172,7 @@ class Child(AstNode):
class ObjectContent(AstNode):
@validate()
@property
def gir_class(self):
if isinstance(self.parent, Template):
return self.parent.gir_parent
@ -164,12 +195,13 @@ class ObjectContent(AstNode):
class Property(AstNode):
@validate()
@property
def gir_property(self):
if self.gir_class is not None:
return self.gir_class.properties.get(self.tokens["name"])
@validate()
@property
def gir_class(self):
parent = self.parent.parent
if isinstance(parent, Template):
@ -179,6 +211,7 @@ class Property(AstNode):
else:
raise CompilerBugError()
@validate("name")
def property_exists(self):
if self.gir_class is None:
@ -233,12 +266,13 @@ class Property(AstNode):
class Signal(AstNode):
@validate()
@property
def gir_signal(self):
if self.gir_class is not None:
return self.gir_class.signals.get(self.name)
return self.gir_class.signals.get(self.tokens["name"])
@validate()
@property
def gir_class(self):
parent = self.parent.parent
if isinstance(parent, Template):
@ -248,6 +282,7 @@ class Signal(AstNode):
else:
raise CompilerBugError()
@validate("name")
def signal_exists(self):
if self.gir_class is None:
@ -262,7 +297,7 @@ class Signal(AstNode):
if self.gir_signal is None:
raise CompileError(
f"Class {self.gir_class.full_name} does not contain a signal called {self.name}",
f"Class {self.gir_class.full_name} does not contain a signal called {self.tokens['name']}",
did_you_mean=(self.tokens["name"], self.gir_class.signals.keys())
)

93
gtkblueprinttool/ast_utils.py
View file

@ -52,6 +52,7 @@ class AstNode:
def __init_subclass__(cls):
cls.completers = []
cls.validators = [getattr(cls, f) for f in dir(cls) if hasattr(getattr(cls, f), "_validator")]
@property
@ -66,9 +67,9 @@ class AstNode:
return list(self._get_errors())
def _get_errors(self):
for name, attr in self._attrs_by_type(Validator):
for validator in self.validators:
try:
getattr(self, name)
validator(self)
except AlreadyCaughtError:
pass
except CompileError as e:
@ -111,70 +112,40 @@ class AstNode:
return None
class Validator:
def __init__(self, func, token_name=None, end_token_name=None):
self.func = func
self.token_name = token_name
self.end_token_name = end_token_name
def __get__(self, instance, owner):
if instance is None:
return self
key = "_validation_result_" + self.func.__name__
if key + "_err" in instance.__dict__:
# If the validator has failed before, raise a generic Exception.
# We want anything that depends on this validation result to
# fail, but not report the exception twice.
raise AlreadyCaughtError()
if key not in instance.__dict__:
try:
instance.__dict__[key] = self.func(instance)
except CompileError as e:
# Mark the validator as already failed so we don't print the
# same message again
instance.__dict__[key + "_err"] = True
# If the node is only partially complete, then an error must
# have already been reported at the parsing stage
if instance.incomplete:
return None
# This mess of code sets the error's start and end positions
# from the tokens passed to the decorator, if they have not
# already been set
if self.token_name is not None and e.start is None:
group = instance.group.tokens.get(self.token_name)
if self.end_token_name is not None and group is None:
group = instance.group.tokens[self.end_token_name]
e.start = group.start
if (self.token_name is not None or self.end_token_name is not None) and e.end is None:
e.end = instance.group.tokens[self.end_token_name or self.token_name].end
# Re-raise the exception
raise e
except Exception as e:
# If the node is only partially complete, then an error must
# have already been reported at the parsing stage
if instance.incomplete:
return None
else:
raise e
# Return the validation result (which other validators, or the code
# generation phase, might depend on)
return instance.__dict__[key]
def validate(*args, **kwargs):
def validate(token_name=None, end_token_name=None, skip_incomplete=False):
""" Decorator for functions that validate an AST node. Exceptions raised
during validation are marked with range information from the tokens. Also
creates a cached property out of the function. """
def decorator(func):
return Validator(func, *args, **kwargs)
def inner(self):
if skip_incomplete and self.incomplete:
return
try:
func(self)
except CompileError as e:
# If the node is only partially complete, then an error must
# have already been reported at the parsing stage
if self.incomplete:
return
# This mess of code sets the error's start and end positions
# from the tokens passed to the decorator, if they have not
# already been set
if token_name is not None and e.start is None:
group = self.group.tokens.get(token_name)
if end_token_name is not None and group is None:
group = self.group.tokens[end_token_name]
e.start = group.start
if (token_name is not None or end_token_name is not None) and e.end is None:
e.end = self.group.tokens[end_token_name or token_name].end
# Re-raise the exception
raise e
inner._validator = True
return inner
return decorator

60
gtkblueprinttool/gir.py
View file

@ -203,6 +203,12 @@ class Namespace(GirNode):
def signature(self):
return f"namespace {self.name} {self.version}"
def get_type(self, name):
""" Gets a type (class, interface, enum, etc.) from this namespace. """
return self.classes.get(name) or self.interfaces.get(name)
def lookup_class(self, name: str):
if "." in name:
ns, cls = name.split(".")
@ -254,43 +260,43 @@ class GirContext:
self.namespaces[namespace.name] = namespace
def get_class(self, name: str, ns:str=None) -> Class:
if ns is None:
options = [namespace.classes[name]
for namespace in self.namespaces.values()
if name in namespace.classes]
def get_type(self, name: str, ns: str) -> GirNode:
ns = ns or "Gtk"
if len(options) == 1:
return options[0]
elif len(options) == 0:
raise CompileError(
f"No imported namespace contains a class called {name}",
hints=[
"Did you forget to import a namespace?",
"Did you check your spelling?",
"Are your dependencies up to date?",
],
)
else:
raise CompileError(
f"Class name {name} is ambiguous",
hints=[
f"Specify the namespace, e.g. `{options[0].ns.name}.{name}`",
f"Namespaces with a class named {name}: {', '.join([cls.ns.name for cls in options])}",
],
)
if ns not in self.namespaces:
return None
return self.namespaces[ns].get_type(name)
def get_class(self, name: str, ns: str) -> T.Optional[Class]:
type = self.get_type(name, ns)
if isinstance(type, Class):
return type
def validate_class(self, name: str, ns: str) -> Class:
""" Raises an exception if there is a problem looking up the given
class (it doesn't exist, it isn't a class, etc.) """
ns = ns or "Gtk"
else:
if ns not in self.namespaces:
raise CompileError(
f"Namespace `{ns}` was not imported.",
did_you_mean=(ns, self.namespaces.keys()),
)
if name not in self.namespaces[ns].classes:
type = self.get_type(name, ns)
if type is None:
raise CompileError(
f"Namespace {ns} does not contain a class called {name}.",
did_you_mean=(name, self.namespaces[ns].classes.keys()),
)
elif not isinstance(type, Class):
raise CompileError(
f"{ns}.{name} is not a class.",
did_you_mean=(name, self.namespaces[ns].classes.keys()),
)
return self.namespaces[ns].classes[name]