def make_array(
elements: typing.List[irast.Base], *,
ctx: context.ContextLevel) -> irast.Array:
arr = irast.Array(elements=elements)
arr.stype = inference.infer_type(arr, env=ctx.env)
return arr
def ql_typeref_to_ir_typeref(
ql_t: qlast.TypeExpr, *,
ctx: context.ContextLevel) -> typing.Union[irast.Array, irast.TypeRef]:
types = _ql_typeexpr_to_ir_typeref(ql_t, ctx=ctx)
if len(types) > 1:
return irast.Array(elements=types)
else:
return types[0]
def compile_Array(expr: qlast.Base, *,
ctx: context.ContextLevel) -> irast.Base:
elements = [dispatch.compile(e, ctx=ctx) for e in expr.elements]
# check that none of the elements are themselves arrays
for el, expr_el in zip(elements, expr.elements):
if isinstance(irutils.infer_type(el, ctx.schema), s_types.Array):
raise errors.EdgeQLError(f'nested arrays are not supported',
context=expr_el.context)
return setgen.generated_set(irast.Array(elements=elements), ctx=ctx)
def compile_TypeCast(expr: qlast.Base, *,
ctx: context.ContextLevel) -> irast.Base:
target_typeref = typegen.ql_typeref_to_ir_typeref(expr.type, ctx=ctx)
if (isinstance(expr.expr, qlast.Array) and not expr.expr.elements
and target_typeref.maintype == 'array'):
ir_expr = irast.Array()
elif isinstance(expr.expr, qlast.Parameter):
pt = typegen.ql_typeref_to_type(expr.type, ctx=ctx)
param_name = expr.expr.name
if param_name not in ctx.env.query_parameters:
if ctx.env.query_parameters:
first_key: str = next(iter(ctx.env.query_parameters))
if first_key.isdecimal():
if not param_name.isdecimal():
raise errors.QueryError(
f'expected a positional argument',
context=expr.expr.context)
else:
if param_name.isdecimal():
raise errors.QueryError(f'expected a named argument',
context=expr.expr.context)
ctx.env.query_parameters[param_name] = pt
else:
param_first_type = ctx.env.query_parameters[param_name]
if not param_first_type.explicitly_castable_to(pt, ctx.env.schema):
raise errors.QueryError(
f'cannot cast '
f'{param_first_type.get_displayname(ctx.env.schema)} to '
f'{pt.get_displayname(ctx.env.schema)}',
context=expr.expr.context)
param = irast.Parameter(stype=pt,
name=param_name,
context=expr.expr.context)
return setgen.ensure_set(param, ctx=ctx)
else:
with ctx.new() as subctx:
# We use "exposed" mode in case this is a type of a cast
# that wants view shapes, e.g. a std::json cast. We do
# this wholesale to support tuple and array casts without
# having to analyze the target type (which is cumbersome
# in QL AST).
subctx.expr_exposed = True
ir_expr = dispatch.compile(expr.expr, ctx=subctx)
new_stype = typegen.ql_typeref_to_type(expr.type, ctx=ctx)
return cast.compile_cast(ir_expr,
new_stype,
ctx=ctx,
srcctx=expr.expr.context)
def compile_TypeCast(expr: qlast.Base, *,
ctx: context.ContextLevel) -> irast.Base:
maintype = expr.type.maintype
if (isinstance(expr.expr, qlast.EmptyCollection)
and maintype.name == 'array'):
ir_expr = irast.Array()
else:
ir_expr = dispatch.compile(expr.expr, ctx=ctx)
return setgen.ensure_set(_cast_expr(expr.type,
ir_expr,
ctx=ctx,
source_context=expr.expr.context),
ctx=ctx)
def process_type_ref_expr(
expr: irast.Base) -> typing.Union[irast.Array, irast.TypeRef]:
if isinstance(expr.expr, irast.Tuple):
elems = []
for elem in expr.expr.elements:
ref_elem = process_type_ref_elem(elem.val, elem.context)
elems.append(ref_elem)
expr = irast.Array(elements=elems)
else:
expr = process_type_ref_elem(expr, expr.context)
return expr
def _cast_array_literal(ir_set: irast.Set, orig_stype: s_types.Type,
new_stype: s_types.Type, *,
srcctx: parsing.ParserContext,
ctx: context.ContextLevel) -> irast.Base:
orig_typeref = irutils.type_to_typeref(ctx.env.schema, orig_stype)
new_typeref = irutils.type_to_typeref(ctx.env.schema, new_stype)
direct_cast = _find_cast(orig_stype, new_stype, srcctx=srcctx, ctx=ctx)
if direct_cast is None:
if not new_stype.is_array():
raise errors.QueryError(
f'cannot cast {orig_stype.get_displayname(ctx.env.schema)!r} '
f'to {new_stype.get_displayname(ctx.env.schema)!r}',
context=srcctx) from None
el_type = new_stype.get_subtypes()[0]
else:
el_type = new_stype
casted_els = []
for el in ir_set.expr.elements:
el = compile_cast(el, el_type, ctx=ctx, srcctx=srcctx)
casted_els.append(el)
new_array = setgen.generated_set(irast.Array(elements=casted_els,
stype=orig_stype),
ctx=ctx)
if direct_cast is not None:
return _cast_to_ir(new_array,
direct_cast,
orig_stype,
new_stype,
ctx=ctx)
else:
cast_ir = irast.TypeCast(
expr=new_array,
from_type=orig_typeref,
to_type=new_typeref,
sql_cast=True,
)
return setgen.ensure_set(cast_ir, ctx=ctx)
def compile_cast(ir_expr: irast.Base, new_stype: s_types.Type, *,
srcctx: parsing.ParserContext,
ctx: context.ContextLevel) -> irast.OperatorCall:
if isinstance(ir_expr, irast.EmptySet):
# For the common case of casting an empty set, we simply
# generate a new EmptySet node of the requested type.
return irutils.new_empty_set(ctx.env.schema,
stype=new_stype,
alias=ir_expr.path_id.target_name.name)
elif irutils.is_untyped_empty_array_expr(ir_expr):
# Ditto for empty arrays.
return setgen.generated_set(irast.Array(elements=[], stype=new_stype),
ctx=ctx)
ir_set = setgen.ensure_set(ir_expr, ctx=ctx)
orig_stype = ir_set.stype
if orig_stype == new_stype:
return ir_set
elif orig_stype.is_object_type() and new_stype.is_object_type():
# Object types cannot be cast between themselves,
# as cast is a _constructor_ operation, and the only
# valid way to construct an object is to INSERT it.
raise errors.QueryError(
f'cannot cast object type '
f'{orig_stype.get_displayname(ctx.env.schema)!r} '
f'to {new_stype.get_displayname(ctx.env.schema)!r}, use '
f'`...[IS {new_stype.get_displayname(ctx.env.schema)}]` instead',
context=srcctx)
if isinstance(ir_set.expr, irast.Array):
return _cast_array_literal(ir_set,
orig_stype,
new_stype,
srcctx=srcctx,
ctx=ctx)
elif orig_stype.is_tuple():
return _cast_tuple(ir_set,
orig_stype,
new_stype,
srcctx=srcctx,
ctx=ctx)
elif orig_stype.issubclass(ctx.env.schema, new_stype):
# The new type is a supertype of the old type,
# and is always a wider domain, so we simply reassign
# the stype.
return _inheritance_cast_to_ir(ir_set, orig_stype, new_stype, ctx=ctx)
elif new_stype.issubclass(ctx.env.schema, orig_stype):
# The new type is a subtype, so may potentially have
# a more restrictive domain, generate a cast call.
return _inheritance_cast_to_ir(ir_set, orig_stype, new_stype, ctx=ctx)
elif orig_stype.is_array():
return _cast_array(ir_set,
orig_stype,
new_stype,
srcctx=srcctx,
ctx=ctx)
else:
json_t = ctx.env.schema.get('std::json')
if (new_stype.issubclass(ctx.env.schema, json_t)
and ir_set.path_id.is_objtype_path()):
# JSON casts of objects are special: we want the full shape
# and not just an identity.
viewgen.compile_view_shapes(ir_set, ctx=ctx)
return _compile_cast(ir_expr,
orig_stype,
new_stype,
srcctx=srcctx,
ctx=ctx)
def compile_Array(
expr: qlast.Base, *, ctx: context.ContextLevel) -> irast.Base:
elements = [dispatch.compile(e, ctx=ctx) for e in expr.elements]
return setgen.generated_set(irast.Array(elements=elements), ctx=ctx)
