def reduce_DUNDERSOURCE(self, *kids):
self.val = qlast.Path(steps=[qlast.Source()])
def _normalize_view_ptr_expr(
shape_el: qlast.ShapeElement,
view_scls: s_nodes.Node,
*,
path_id: irast.PathId,
is_insert: bool = False,
is_update: bool = False,
view_rptr: typing.Optional[context.ViewRPtr] = None,
ctx: context.CompilerContext) -> s_pointers.Pointer:
steps = shape_el.expr.steps
is_linkprop = False
is_mutation = is_insert or is_update
# Pointers may be qualified by the explicit source
# class, which is equivalent to Expr[IS Type].
is_polymorphic = len(steps) == 2
scls = view_scls.peel_view()
ptrsource = scls
qlexpr = None
if is_polymorphic:
source = qlast.TypeFilter(expr=qlast.Path(steps=[qlast.Source()]),
type=qlast.TypeName(maintype=steps[0]))
lexpr = steps[1]
ptrsource = schemactx.get_schema_type(steps[0], ctx=ctx)
elif len(steps) == 1:
lexpr = steps[0]
is_linkprop = lexpr.type == 'property'
if is_linkprop:
if view_rptr is None:
raise errors.EdgeQLError(
'invalid reference to link property '
'in top level shape',
context=lexpr.context)
if view_rptr.ptrcls is None:
derive_ptrcls(view_rptr, target_scls=view_scls, ctx=ctx)
ptrsource = scls = view_rptr.ptrcls
source = qlast.Source()
else:
raise RuntimeError(
f'unexpected path length in view shape: {len(steps)}')
ptrname = (lexpr.ptr.module, lexpr.ptr.name)
ptrcls_is_derived = False
compexpr = shape_el.compexpr
if compexpr is None and is_insert and shape_el.elements:
# Nested insert short form:
# INSERT Foo { bar: Spam { name := 'name' }}
# Expand to:
# INSERT Foo { bar := (INSERT Spam { name := 'name' }) }
if lexpr.target is not None:
ptr_target = schemactx.get_schema_type(lexpr.target, ctx=ctx)
else:
ptr_target = None
base_ptrcls = ptrcls = setgen.resolve_ptr(
ptrsource,
ptrname,
s_pointers.PointerDirection.Outbound,
target=ptr_target,
ctx=ctx)
compexpr = qlast.InsertQuery(subject=qlast.Path(steps=[
qlast.ObjectRef(name=ptrcls.target.name.name,
module=ptrcls.target.name.module)
]),
shape=shape_el.elements)
if compexpr is None:
if lexpr.target is not None:
ptr_target = schemactx.get_schema_type(lexpr.target, ctx=ctx)
else:
ptr_target = None
base_ptrcls = ptrcls = setgen.resolve_ptr(
ptrsource,
ptrname,
s_pointers.PointerDirection.Outbound,
target=ptr_target,
ctx=ctx)
base_ptr_is_computable = ptrcls in ctx.source_map
if ptr_target is not None and ptr_target != base_ptrcls.target:
# This happens when a union type target is narrowed by an
# [IS Type] construct. Since the derived pointer will have
# the correct target, we don't need to do anything, but
# remove the [IS] qualifier to prevent recursion.
lexpr.target = None
else:
ptr_target = ptrcls.target
if ptrcls in ctx.pending_cardinality:
# We do not know the parent's pointer cardinality yet.
ptr_cardinality = None
else:
ptr_cardinality = ptrcls.cardinality
if shape_el.elements:
sub_view_rptr = context.ViewRPtr(
ptrsource if is_linkprop else view_scls,
ptrcls=ptrcls,
is_insert=is_insert,
is_update=is_update)
sub_path_id = path_id.extend(ptrcls, target=ptrcls.target)
ctx.path_scope.attach_path(sub_path_id)
if is_update:
for subel in shape_el.elements or []:
is_prop = (isinstance(subel.expr.steps[0], qlast.Ptr)
and subel.expr.steps[0].type == 'property')
if not is_prop:
raise errors.EdgeQLError(
'only references to link properties are allowed '
'in nested UPDATE shapes',
context=subel.context)
ptr_target = _process_view(scls=ptr_target,
path_id=sub_path_id,
view_rptr=sub_view_rptr,
elements=shape_el.elements,
is_update=True,
ctx=ctx)
else:
ptr_target = _process_view(scls=ptr_target,
path_id=sub_path_id,
view_rptr=sub_view_rptr,
elements=shape_el.elements,
ctx=ctx)
ptrcls = sub_view_rptr.derived_ptrcls
if ptrcls is None:
ptrcls_is_derived = False
ptrcls = sub_view_rptr.ptrcls
else:
ptrcls_is_derived = True
if (shape_el.where or shape_el.orderby or shape_el.offset
or shape_el.limit or base_ptr_is_computable or is_polymorphic):
if qlexpr is None:
qlexpr = qlast.Path(steps=[source, lexpr])
qlexpr = astutils.ensure_qlstmt(qlexpr)
qlexpr.where = shape_el.where
qlexpr.orderby = shape_el.orderby
qlexpr.offset = shape_el.offset
qlexpr.limit = shape_el.limit
else:
try:
base_ptrcls = ptrcls = setgen.resolve_ptr(
ptrsource,
ptrname,
s_pointers.PointerDirection.Outbound,
ctx=ctx)
ptr_name = ptrcls.shortname
except errors.EdgeQLReferenceError:
if is_mutation:
raise
base_ptrcls = ptrcls = None
ptr_module = (ptrname[0] or ctx.derived_target_module
or scls.name.module)
ptr_name = sn.SchemaName(module=ptr_module, name=ptrname[1])
qlexpr = astutils.ensure_qlstmt(compexpr)
with ctx.newscope(fenced=True) as shape_expr_ctx:
# Put current pointer class in context, so
# that references to link properties in sub-SELECT
# can be resolved. This is necessary for proper
# evaluation of link properties on computable links,
# most importantly, in INSERT/UPDATE context.
shape_expr_ctx.view_rptr = context.ViewRPtr(
ptrsource if is_linkprop else view_scls,
ptrcls=ptrcls,
ptrcls_name=ptr_name,
ptrcls_is_linkprop=is_linkprop,
is_insert=is_insert,
is_update=is_update)
shape_expr_ctx.path_scope.unnest_fence = True
if is_mutation:
shape_expr_ctx.expr_exposed = True
irexpr = dispatch.compile(qlexpr, ctx=shape_expr_ctx)
irexpr.context = compexpr.context
if base_ptrcls is None:
base_ptrcls = ptrcls = shape_expr_ctx.view_rptr.ptrcls
derived_ptrcls = shape_expr_ctx.view_rptr.derived_ptrcls
if derived_ptrcls is not None:
ptrcls_is_derived = True
ptrcls = derived_ptrcls
ptr_cardinality = None
ptr_target = irutils.infer_type(irexpr, ctx.schema)
if ptr_target is None:
msg = 'cannot determine expression result type'
raise errors.EdgeQLError(msg, context=shape_el.context)
if is_mutation and not ptr_target.assignment_castable_to(
base_ptrcls.target, schema=ctx.schema):
# Validate that the insert/update expression is
# of the correct class.
lname = f'({ptrsource.name}).{ptrcls.shortname.name}'
expected = [repr(str(base_ptrcls.target.name))]
raise edgedb_error.InvalidPointerTargetError(
f'invalid target for link {str(lname)!r}: '
f'{str(ptr_target.name)!r} (expecting '
f'{" or ".join(expected)})')
if qlexpr is not None or ptr_target is not ptrcls.target:
if not ptrcls_is_derived:
if is_linkprop:
rptrcls = view_rptr.derived_ptrcls
if rptrcls is None:
rptrcls = derive_ptrcls(view_rptr,
target_scls=view_scls,
ctx=ctx)
src_scls = rptrcls
else:
src_scls = view_scls
ptrcls = schemactx.derive_view(ptrcls,
src_scls,
ptr_target,
is_insert=is_insert,
is_update=is_update,
derived_name_quals=[view_scls.name],
ctx=ctx)
if qlexpr is not None:
ctx.source_map[ptrcls] = (qlexpr, ctx)
ptrcls.computable = True
if not is_mutation:
if ptr_cardinality is None:
if compexpr is not None:
ctx.pending_cardinality.add(ptrcls)
elif ptrcls is not base_ptrcls:
ctx.pointer_derivation_map[base_ptrcls].append(ptrcls)
ptrcls.cardinality = None
else:
ptrcls.cardinality = ptr_cardinality
if ptrcls.is_protected_pointer() and qlexpr is not None:
msg = f'cannot assign to {ptrcls.shortname.name}'
raise errors.EdgeQLError(msg, context=shape_el.context)
return ptrcls