def process_view(
*,
stype: s_objtypes.ObjectType,
path_id: irast.PathId,
elements: List[qlast.ShapeElement],
view_rptr: Optional[context.ViewRPtr]=None,
view_name: Optional[sn.SchemaName]=None,
is_insert: bool=False,
is_update: bool=False,
ctx: context.ContextLevel) -> s_objtypes.ObjectType:
cache_key = (stype, tuple(elements))
view_scls = ctx.shape_type_cache.get(cache_key)
if view_scls is not None:
return view_scls
with ctx.newscope(fenced=True, temporary=True) as scopectx:
scopectx.path_scope.attach_path(path_id)
view_path_id_ns = None
if ctx.expr_exposed or is_insert or is_update:
view_path_id_ns = irast.WeakNamespace(ctx.aliases.get('ns'))
scopectx.path_id_namespace |= {view_path_id_ns}
scopectx.path_scope.add_namespaces({view_path_id_ns})
view_scls = _process_view(
stype=stype, path_id=path_id, elements=elements,
view_rptr=view_rptr, view_name=view_name,
is_insert=is_insert, is_update=is_update,
path_id_namespace=view_path_id_ns, ctx=scopectx
)
ctx.shape_type_cache[cache_key] = view_scls
return view_scls
def declare_view(
expr: qlast.Base, alias: str, *,
fully_detached: bool=False,
temporary_scope: bool=True,
ctx: context.ContextLevel) -> irast.Set:
with ctx.newscope(temporary=temporary_scope, fenced=True) as subctx:
if not fully_detached:
cached_view_set = ctx.expr_view_cache.get((expr, alias))
# Detach the view namespace and record the prefix
# in the parent statement's fence node.
view_path_id_ns = irast.WeakNamespace(ctx.aliases.get('ns'))
subctx.path_id_namespace |= {view_path_id_ns}
ctx.path_scope.add_namespaces((view_path_id_ns,))
else:
cached_view_set = None
if ctx.stmt is not None:
subctx.stmt = ctx.stmt.parent_stmt
if cached_view_set is not None:
subctx.view_scls = setgen.get_set_type(cached_view_set, ctx=ctx)
view_name = subctx.view_scls.get_name(ctx.env.schema)
else:
if isinstance(alias, s_name.SchemaName):
basename = alias
else:
basename = s_name.SchemaName(module='__derived__', name=alias)
view_name = s_name.SchemaName(
module=ctx.derived_target_module or '__derived__',
name=s_name.get_specialized_name(
basename,
ctx.aliases.get('w')
)
)
subctx.toplevel_result_view_name = view_name
view_set = dispatch.compile(astutils.ensure_qlstmt(expr), ctx=subctx)
if not fully_detached:
# The view path id _itself_ should not be in the nested namespace.
# The fully_detached case should be handled by the caller.
view_set.path_id = view_set.path_id.replace_namespace(
ctx.path_id_namespace)
ctx.aliased_views[alias] = setgen.get_set_type(view_set, ctx=ctx)
ctx.path_scope_map[view_set] = subctx.path_scope
ctx.expr_view_cache[expr, alias] = view_set
return view_set
def newctx() -> Iterator[context.ContextLevel]:
with ctx.new() as subctx:
subctx.class_view_overrides = {}
subctx.partial_path_prefix = None
subctx.modaliases = qlctx.modaliases.copy()
subctx.aliased_views = qlctx.aliased_views.new_child()
source_stype = get_set_type(source, ctx=ctx)
if source_scls.is_view(ctx.env.schema):
scls_name = source_stype.get_name(ctx.env.schema)
subctx.aliased_views[scls_name] = None
subctx.source_map = qlctx.source_map.copy()
subctx.view_nodes = qlctx.view_nodes.copy()
subctx.view_map = qlctx.view_map.new_child()
source_scope = pathctx.get_set_scope(rptr.source, ctx=ctx)
if source_scope and source_scope.namespaces:
subctx.path_id_namespace |= source_scope.namespaces
if path_id_ns is not None:
subctx.path_id_namespace |= {path_id_ns}
pending_pid_ns: Set[irast.AnyNamespace] = {
irast.WeakNamespace(ctx.aliases.get('ns')),
}
if path_id_ns is not None and same_scope:
pending_pid_ns.add(path_id_ns)
subctx.pending_stmt_own_path_id_namespace = (
frozenset(pending_pid_ns))
subns = set(pending_pid_ns)
self_view = ctx.view_sets.get(source_stype)
if self_view:
if self_view.path_id.namespace:
subns.update(self_view.path_id.namespace)
inner_path_id = self_view.path_id.merge_namespace(
subctx.path_id_namespace | subns)
else:
if source.path_id.namespace:
subns.update(source.path_id.namespace)
if inner_source_path_id is not None:
# The path id recorded in the source map may
# contain namespaces referring to a temporary
# scope subtree used by `process_view()`.
# Since we recompile the computable expression
# using the current path id namespace, the
# original source path id needs to be fixed.
inner_path_id = inner_source_path_id \
.strip_namespace(qlctx.path_id_namespace) \
.merge_namespace(subctx.path_id_namespace)
else:
inner_path_id = pathctx.get_path_id(source_stype,
ctx=subctx)
inner_path_id = inner_path_id.merge_namespace(subns)
subctx.pending_stmt_full_path_id_namespace = frozenset(subns)
remapped_source = new_set_from_set(rptr.source,
rptr=rptr.source.rptr,
preserve_scope_ns=True,
ctx=ctx)
subctx.view_map[inner_path_id] = remapped_source
yield subctx
def declare_view(
expr: qlast.Expr,
alias: s_name.Name,
*,
factoring_fence: bool = False,
fully_detached: bool = False,
must_be_used: bool = False,
path_id_namespace: Optional[FrozenSet[str]] = None,
ctx: context.ContextLevel,
) -> irast.Set:
pinned_pid_ns = path_id_namespace
with ctx.newscope(fenced=True) as subctx:
subctx.path_scope.factoring_fence = factoring_fence
if path_id_namespace is not None:
subctx.path_id_namespace = path_id_namespace
if not fully_detached:
cached_view_set = ctx.expr_view_cache.get((expr, alias))
# Detach the view namespace and record the prefix
# in the parent statement's fence node.
view_path_id_ns = irast.WeakNamespace(ctx.aliases.get('ns'))
subctx.path_id_namespace |= {view_path_id_ns}
ctx.path_scope.add_namespaces({view_path_id_ns})
else:
cached_view_set = None
if ctx.stmt is not None:
subctx.stmt = ctx.stmt.parent_stmt
if cached_view_set is not None:
subctx.view_scls = setgen.get_set_type(cached_view_set, ctx=ctx)
view_name = subctx.view_scls.get_name(ctx.env.schema)
assert isinstance(view_name, s_name.QualName)
else:
if isinstance(alias, s_name.QualName):
basename = alias
else:
basename = s_name.QualName(module='__derived__',
name=alias.name)
if (isinstance(alias, s_name.QualName)
and subctx.env.options.schema_view_mode):
view_name = basename
subctx.recompiling_schema_alias = True
else:
view_name = s_name.QualName(
module=ctx.derived_target_module or '__derived__',
name=s_name.get_specialized_name(basename,
ctx.aliases.get('w')))
subctx.toplevel_result_view_name = view_name
view_set = dispatch.compile(astutils.ensure_qlstmt(expr), ctx=subctx)
assert isinstance(view_set, irast.Set)
ctx.path_scope_map[view_set] = context.ScopeInfo(
path_scope=subctx.path_scope,
pinned_path_id_ns=pinned_pid_ns,
)
if not fully_detached:
# The view path id _itself_ should not be in the nested namespace.
# The fully_detached case should be handled by the caller.
if path_id_namespace is None:
path_id_namespace = ctx.path_id_namespace
view_set.path_id = view_set.path_id.replace_namespace(
path_id_namespace)
view_type = setgen.get_set_type(view_set, ctx=ctx)
ctx.aliased_views[alias] = view_type
ctx.expr_view_cache[expr, alias] = view_set
if must_be_used:
ctx.must_use_views[view_type] = (alias, expr.context)
return view_set
