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language: Add expression literals

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Add expression literals, so you can set properties of type
Gtk.Expression.
This commit is contained in:
James Westman 2024-12-24 12:54:23 -06:00
parent b9f58aeab5
commit 8c6f8760f7
29 changed files with 268 additions and 21 deletions
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30
blueprintcompiler/language/expression.py
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@ -81,6 +81,16 @@ class LiteralExpr(ExprBase):
or self.root.is_legacy_template(self.literal.value.ident)
)
@property
def is_this(self) -> bool:
from .values import IdentLiteral
return (
not self.is_object
and isinstance(self.literal.value, IdentLiteral)
and self.literal.value.ident == "item"
)
@property
def literal(self):
from .values import Literal
@ -91,6 +101,15 @@ class LiteralExpr(ExprBase):
def type(self) -> T.Optional[GirType]:
return self.literal.value.type
@validate()
def item_validations(self):
if self.is_this:
if not isinstance(self.rhs, CastExpr):
raise CompileError('"item" must be cast to its object type')
if not isinstance(self.rhs.rhs, LookupOp):
raise CompileError('"item" can only be used for looking up properties')
class LookupOp(InfixExpr):
grammar = [".", UseIdent("property")]
@ -285,6 +304,9 @@ expr.children = [
def decompile_lookup(
ctx: DecompileCtx, gir: gir.GirContext, cdata: str, name: str, type: str
):
if ctx.parent_node is not None and ctx.parent_node.tag == "property":
ctx.print("expr ")
if t := ctx.type_by_cname(type):
type = decompile.full_name(t)
else:
@ -304,6 +326,8 @@ def decompile_lookup(
if constant is not None:
if constant == ctx.template_class:
ctx.print("template." + name)
elif constant == "":
ctx.print("item as <" + type + ">." + name)
else:
ctx.print(constant + "." + name)
return
@ -318,6 +342,9 @@ def decompile_lookup(
def decompile_constant(
ctx: DecompileCtx, gir: gir.GirContext, cdata: str, type: T.Optional[str] = None
):
if ctx.parent_node is not None and ctx.parent_node.tag == "property":
ctx.print("expr ")
if type is None:
if cdata == ctx.template_class:
ctx.print("template")
@ -330,6 +357,9 @@ def decompile_constant(
@decompiler("closure", skip_children=True)
def decompile_closure(ctx: DecompileCtx, gir: gir.GirContext, function: str, type: str):
if ctx.parent_node is not None and ctx.parent_node.tag == "property":
ctx.print("expr ")
if t := ctx.type_by_cname(type):
type = decompile.full_name(t)
else: