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expressions: Validate lookup expressions

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James Westman 2022-04-30 15:20:05 -05:00
parent cc1d2ab78f
commit 76a482affb
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8 changed files with 50 additions and 9 deletions
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36
blueprintcompiler/language/expression.py
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@ -50,12 +50,26 @@ class IdentExpr(AstNode):
def is_this(self):
return self.parent_by_type(Scope).this_name == self.tokens["ident"]
@validate()
def exists(self):
if self.is_this:
return
scope = self.parent_by_type(Scope)
if self.tokens["ident"] not in scope.variables:
raise CompileError(
f"Could not find object with ID '{self.tokens['ident']}'",
did_you_mean=(self.tokens['ident'], scope.variables.keys()),
)
@property
def gir_type(self):
scope = self.parent_by_type(Scope)
if self.is_this:
return self.parent_by_type(Scope).this_type
else:
return None
return scope.this_type
elif self.tokens["ident"] in scope.variables:
return scope.variables[self.tokens["ident"]].gir_class
def emit_xml(self, xml: XmlEmitter):
if self.is_this:
@ -93,7 +107,21 @@ class LookupOp(InfixExpr):
@property
def gir_type(self):
return None
if parent_type := self.lhs.gir_type:
if prop := parent_type.properties.get(self.tokens["property"]):
return prop.type
@validate("property")
def property_exists(self):
if parent_type := self.lhs.gir_type:
if not (isinstance(parent_type, gir.Class) or isinstance(parent_type, gir.Interface)):
raise CompileError(f"Type {parent_type.full_name} does not have properties")
elif self.tokens["property"] not in parent_type.properties:
raise CompileError(
f"{parent_type.full_name} does not have a property called {self.tokens['property']}",
hints=["Do you need to cast the previous expression?"],
did_you_mean=(self.tokens['property'], parent_type.properties.keys()),
)
def emit_xml(self, xml: XmlEmitter):
if isinstance(self.lhs, IdentExpr) and self.lhs.is_this: