mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-18 12:20:24 +00:00
ff3e84ad67
updating kubernetes to 1.28.0 in the main repo. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
1196 lines
32 KiB
Go
1196 lines
32 KiB
Go
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package interpreter
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import (
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"fmt"
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"github.com/google/cel-go/common/operators"
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"github.com/google/cel-go/common/overloads"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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"github.com/google/cel-go/common/types/traits"
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"github.com/google/cel-go/interpreter/functions"
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)
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// Interpretable can accept a given Activation and produce a value along with
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// an accompanying EvalState which can be used to inspect whether additional
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// data might be necessary to complete the evaluation.
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type Interpretable interface {
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// ID value corresponding to the expression node.
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ID() int64
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// Eval an Activation to produce an output.
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Eval(activation Activation) ref.Val
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}
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// InterpretableConst interface for tracking whether the Interpretable is a constant value.
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type InterpretableConst interface {
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Interpretable
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// Value returns the constant value of the instruction.
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Value() ref.Val
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}
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// InterpretableAttribute interface for tracking whether the Interpretable is an attribute.
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type InterpretableAttribute interface {
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Interpretable
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// Attr returns the Attribute value.
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Attr() Attribute
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// Adapter returns the type adapter to be used for adapting resolved Attribute values.
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Adapter() ref.TypeAdapter
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// AddQualifier proxies the Attribute.AddQualifier method.
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//
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// Note, this method may mutate the current attribute state. If the desire is to clone the
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// Attribute, the Attribute should first be copied before adding the qualifier. Attributes
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// are not copyable by default, so this is a capable that would need to be added to the
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// AttributeFactory or specifically to the underlying Attribute implementation.
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AddQualifier(Qualifier) (Attribute, error)
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// Qualify replicates the Attribute.Qualify method to permit extension and interception
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// of object qualification.
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Qualify(vars Activation, obj any) (any, error)
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// QualifyIfPresent qualifies the object if the qualifier is declared or defined on the object.
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// The 'presenceOnly' flag indicates that the value is not necessary, just a boolean status as
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// to whether the qualifier is present.
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QualifyIfPresent(vars Activation, obj any, presenceOnly bool) (any, bool, error)
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// IsOptional indicates whether the resulting value is an optional type.
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IsOptional() bool
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// Resolve returns the value of the Attribute given the current Activation.
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Resolve(Activation) (any, error)
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}
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// InterpretableCall interface for inspecting Interpretable instructions related to function calls.
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type InterpretableCall interface {
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Interpretable
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// Function returns the function name as it appears in text or mangled operator name as it
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// appears in the operators.go file.
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Function() string
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// OverloadID returns the overload id associated with the function specialization.
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// Overload ids are stable across language boundaries and can be treated as synonymous with a
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// unique function signature.
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OverloadID() string
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// Args returns the normalized arguments to the function overload.
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// For receiver-style functions, the receiver target is arg 0.
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Args() []Interpretable
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}
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// InterpretableConstructor interface for inspecting Interpretable instructions that initialize a list, map
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// or struct.
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type InterpretableConstructor interface {
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Interpretable
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// InitVals returns all the list elements, map key and values or struct field values.
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InitVals() []Interpretable
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// Type returns the type constructed.
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Type() ref.Type
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}
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// Core Interpretable implementations used during the program planning phase.
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type evalTestOnly struct {
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id int64
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InterpretableAttribute
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}
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// ID implements the Interpretable interface method.
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func (test *evalTestOnly) ID() int64 {
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return test.id
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}
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// Eval implements the Interpretable interface method.
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func (test *evalTestOnly) Eval(ctx Activation) ref.Val {
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val, err := test.Resolve(ctx)
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// Return an error if the resolve step fails
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if err != nil {
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return types.WrapErr(err)
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}
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if optVal, isOpt := val.(*types.Optional); isOpt {
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return types.Bool(optVal.HasValue())
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}
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return test.Adapter().NativeToValue(val)
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}
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// AddQualifier appends a qualifier that will always and only perform a presence test.
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func (test *evalTestOnly) AddQualifier(q Qualifier) (Attribute, error) {
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cq, ok := q.(ConstantQualifier)
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if !ok {
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return nil, fmt.Errorf("test only expressions must have constant qualifiers: %v", q)
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}
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return test.InterpretableAttribute.AddQualifier(&testOnlyQualifier{ConstantQualifier: cq})
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}
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type testOnlyQualifier struct {
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ConstantQualifier
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}
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// Qualify determines whether the test-only qualifier is present on the input object.
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func (q *testOnlyQualifier) Qualify(vars Activation, obj any) (any, error) {
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out, present, err := q.ConstantQualifier.QualifyIfPresent(vars, obj, true)
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if err != nil {
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return nil, err
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}
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if unk, isUnk := out.(types.Unknown); isUnk {
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return unk, nil
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}
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if opt, isOpt := out.(types.Optional); isOpt {
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return opt.HasValue(), nil
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}
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return present, nil
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}
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// QualifyIfPresent returns whether the target field in the test-only expression is present.
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func (q *testOnlyQualifier) QualifyIfPresent(vars Activation, obj any, presenceOnly bool) (any, bool, error) {
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// Only ever test for presence.
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return q.ConstantQualifier.QualifyIfPresent(vars, obj, true)
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}
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// QualifierValueEquals determines whether the test-only constant qualifier equals the input value.
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func (q *testOnlyQualifier) QualifierValueEquals(value any) bool {
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// The input qualifier will always be of type string
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return q.ConstantQualifier.Value().Value() == value
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}
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// NewConstValue creates a new constant valued Interpretable.
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func NewConstValue(id int64, val ref.Val) InterpretableConst {
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return &evalConst{
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id: id,
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val: val,
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}
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}
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type evalConst struct {
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id int64
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val ref.Val
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}
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// ID implements the Interpretable interface method.
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func (cons *evalConst) ID() int64 {
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return cons.id
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}
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// Eval implements the Interpretable interface method.
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func (cons *evalConst) Eval(ctx Activation) ref.Val {
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return cons.val
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}
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// Value implements the InterpretableConst interface method.
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func (cons *evalConst) Value() ref.Val {
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return cons.val
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}
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type evalOr struct {
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id int64
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lhs Interpretable
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rhs Interpretable
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}
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// ID implements the Interpretable interface method.
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func (or *evalOr) ID() int64 {
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return or.id
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}
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// Eval implements the Interpretable interface method.
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func (or *evalOr) Eval(ctx Activation) ref.Val {
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// short-circuit lhs.
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lVal := or.lhs.Eval(ctx)
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lBool, lok := lVal.(types.Bool)
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if lok && lBool == types.True {
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return types.True
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}
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// short-circuit on rhs.
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rVal := or.rhs.Eval(ctx)
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rBool, rok := rVal.(types.Bool)
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if rok && rBool == types.True {
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return types.True
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}
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// return if both sides are bool false.
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if lok && rok {
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return types.False
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}
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// TODO: return both values as a set if both are unknown or error.
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// prefer left unknown to right unknown.
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if types.IsUnknown(lVal) {
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return lVal
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}
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if types.IsUnknown(rVal) {
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return rVal
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}
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// If the left-hand side is non-boolean return it as the error.
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if types.IsError(lVal) {
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return lVal
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}
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return types.ValOrErr(rVal, "no such overload")
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}
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type evalAnd struct {
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id int64
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lhs Interpretable
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rhs Interpretable
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}
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// ID implements the Interpretable interface method.
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func (and *evalAnd) ID() int64 {
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return and.id
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}
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// Eval implements the Interpretable interface method.
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func (and *evalAnd) Eval(ctx Activation) ref.Val {
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// short-circuit lhs.
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lVal := and.lhs.Eval(ctx)
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lBool, lok := lVal.(types.Bool)
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if lok && lBool == types.False {
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return types.False
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}
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// short-circuit on rhs.
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rVal := and.rhs.Eval(ctx)
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rBool, rok := rVal.(types.Bool)
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if rok && rBool == types.False {
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return types.False
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}
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// return if both sides are bool true.
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if lok && rok {
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return types.True
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}
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// TODO: return both values as a set if both are unknown or error.
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// prefer left unknown to right unknown.
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if types.IsUnknown(lVal) {
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return lVal
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}
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if types.IsUnknown(rVal) {
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return rVal
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}
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// If the left-hand side is non-boolean return it as the error.
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if types.IsError(lVal) {
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return lVal
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}
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return types.ValOrErr(rVal, "no such overload")
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}
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type evalEq struct {
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id int64
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lhs Interpretable
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rhs Interpretable
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}
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// ID implements the Interpretable interface method.
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func (eq *evalEq) ID() int64 {
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return eq.id
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}
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// Eval implements the Interpretable interface method.
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func (eq *evalEq) Eval(ctx Activation) ref.Val {
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lVal := eq.lhs.Eval(ctx)
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rVal := eq.rhs.Eval(ctx)
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if types.IsUnknownOrError(lVal) {
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return lVal
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}
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if types.IsUnknownOrError(rVal) {
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return rVal
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}
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return types.Equal(lVal, rVal)
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}
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// Function implements the InterpretableCall interface method.
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func (*evalEq) Function() string {
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return operators.Equals
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}
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// OverloadID implements the InterpretableCall interface method.
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func (*evalEq) OverloadID() string {
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return overloads.Equals
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}
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// Args implements the InterpretableCall interface method.
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func (eq *evalEq) Args() []Interpretable {
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return []Interpretable{eq.lhs, eq.rhs}
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}
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type evalNe struct {
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id int64
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lhs Interpretable
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rhs Interpretable
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}
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// ID implements the Interpretable interface method.
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func (ne *evalNe) ID() int64 {
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return ne.id
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}
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// Eval implements the Interpretable interface method.
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func (ne *evalNe) Eval(ctx Activation) ref.Val {
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lVal := ne.lhs.Eval(ctx)
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rVal := ne.rhs.Eval(ctx)
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if types.IsUnknownOrError(lVal) {
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return lVal
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}
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if types.IsUnknownOrError(rVal) {
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return rVal
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}
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return types.Bool(types.Equal(lVal, rVal) != types.True)
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}
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// Function implements the InterpretableCall interface method.
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func (*evalNe) Function() string {
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return operators.NotEquals
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}
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// OverloadID implements the InterpretableCall interface method.
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func (*evalNe) OverloadID() string {
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return overloads.NotEquals
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}
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// Args implements the InterpretableCall interface method.
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func (ne *evalNe) Args() []Interpretable {
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return []Interpretable{ne.lhs, ne.rhs}
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}
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type evalZeroArity struct {
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id int64
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function string
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overload string
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impl functions.FunctionOp
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}
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// ID implements the Interpretable interface method.
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func (zero *evalZeroArity) ID() int64 {
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return zero.id
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}
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// Eval implements the Interpretable interface method.
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func (zero *evalZeroArity) Eval(ctx Activation) ref.Val {
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return zero.impl()
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}
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// Function implements the InterpretableCall interface method.
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func (zero *evalZeroArity) Function() string {
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return zero.function
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}
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// OverloadID implements the InterpretableCall interface method.
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func (zero *evalZeroArity) OverloadID() string {
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return zero.overload
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}
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// Args returns the argument to the unary function.
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func (zero *evalZeroArity) Args() []Interpretable {
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return []Interpretable{}
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}
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type evalUnary struct {
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id int64
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function string
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overload string
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arg Interpretable
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trait int
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impl functions.UnaryOp
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nonStrict bool
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}
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// ID implements the Interpretable interface method.
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func (un *evalUnary) ID() int64 {
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return un.id
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}
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// Eval implements the Interpretable interface method.
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func (un *evalUnary) Eval(ctx Activation) ref.Val {
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argVal := un.arg.Eval(ctx)
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// Early return if the argument to the function is unknown or error.
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strict := !un.nonStrict
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if strict && types.IsUnknownOrError(argVal) {
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return argVal
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}
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// If the implementation is bound and the argument value has the right traits required to
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// invoke it, then call the implementation.
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if un.impl != nil && (un.trait == 0 || (!strict && types.IsUnknownOrError(argVal)) || argVal.Type().HasTrait(un.trait)) {
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return un.impl(argVal)
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}
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// Otherwise, if the argument is a ReceiverType attempt to invoke the receiver method on the
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// operand (arg0).
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if argVal.Type().HasTrait(traits.ReceiverType) {
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return argVal.(traits.Receiver).Receive(un.function, un.overload, []ref.Val{})
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}
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return types.NewErr("no such overload: %s", un.function)
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}
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// Function implements the InterpretableCall interface method.
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func (un *evalUnary) Function() string {
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return un.function
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}
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// OverloadID implements the InterpretableCall interface method.
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func (un *evalUnary) OverloadID() string {
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return un.overload
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}
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// Args returns the argument to the unary function.
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func (un *evalUnary) Args() []Interpretable {
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return []Interpretable{un.arg}
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}
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type evalBinary struct {
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id int64
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function string
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overload string
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lhs Interpretable
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rhs Interpretable
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trait int
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impl functions.BinaryOp
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nonStrict bool
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}
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// ID implements the Interpretable interface method.
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func (bin *evalBinary) ID() int64 {
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return bin.id
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}
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// Eval implements the Interpretable interface method.
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func (bin *evalBinary) Eval(ctx Activation) ref.Val {
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lVal := bin.lhs.Eval(ctx)
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rVal := bin.rhs.Eval(ctx)
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// Early return if any argument to the function is unknown or error.
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strict := !bin.nonStrict
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if strict {
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if types.IsUnknownOrError(lVal) {
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return lVal
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}
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if types.IsUnknownOrError(rVal) {
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return rVal
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}
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}
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// If the implementation is bound and the argument value has the right traits required to
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// invoke it, then call the implementation.
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if bin.impl != nil && (bin.trait == 0 || (!strict && types.IsUnknownOrError(lVal)) || lVal.Type().HasTrait(bin.trait)) {
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return bin.impl(lVal, rVal)
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}
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// Otherwise, if the argument is a ReceiverType attempt to invoke the receiver method on the
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// operand (arg0).
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if lVal.Type().HasTrait(traits.ReceiverType) {
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return lVal.(traits.Receiver).Receive(bin.function, bin.overload, []ref.Val{rVal})
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}
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return types.NewErr("no such overload: %s", bin.function)
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}
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// Function implements the InterpretableCall interface method.
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func (bin *evalBinary) Function() string {
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return bin.function
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}
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// OverloadID implements the InterpretableCall interface method.
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func (bin *evalBinary) OverloadID() string {
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return bin.overload
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}
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// Args returns the argument to the unary function.
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func (bin *evalBinary) Args() []Interpretable {
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return []Interpretable{bin.lhs, bin.rhs}
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}
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type evalVarArgs struct {
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id int64
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function string
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overload string
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args []Interpretable
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trait int
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impl functions.FunctionOp
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nonStrict bool
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}
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// NewCall creates a new call Interpretable.
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func NewCall(id int64, function, overload string, args []Interpretable, impl functions.FunctionOp) InterpretableCall {
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return &evalVarArgs{
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id: id,
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function: function,
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overload: overload,
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args: args,
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impl: impl,
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}
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}
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// ID implements the Interpretable interface method.
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func (fn *evalVarArgs) ID() int64 {
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return fn.id
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}
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// Eval implements the Interpretable interface method.
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func (fn *evalVarArgs) Eval(ctx Activation) ref.Val {
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argVals := make([]ref.Val, len(fn.args))
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// Early return if any argument to the function is unknown or error.
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strict := !fn.nonStrict
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for i, arg := range fn.args {
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argVals[i] = arg.Eval(ctx)
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if strict && types.IsUnknownOrError(argVals[i]) {
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return argVals[i]
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}
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}
|
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// If the implementation is bound and the argument value has the right traits required to
|
|
// invoke it, then call the implementation.
|
|
arg0 := argVals[0]
|
|
if fn.impl != nil && (fn.trait == 0 || (!strict && types.IsUnknownOrError(arg0)) || arg0.Type().HasTrait(fn.trait)) {
|
|
return fn.impl(argVals...)
|
|
}
|
|
// Otherwise, if the argument is a ReceiverType attempt to invoke the receiver method on the
|
|
// operand (arg0).
|
|
if arg0.Type().HasTrait(traits.ReceiverType) {
|
|
return arg0.(traits.Receiver).Receive(fn.function, fn.overload, argVals[1:])
|
|
}
|
|
return types.NewErr("no such overload: %s", fn.function)
|
|
}
|
|
|
|
// Function implements the InterpretableCall interface method.
|
|
func (fn *evalVarArgs) Function() string {
|
|
return fn.function
|
|
}
|
|
|
|
// OverloadID implements the InterpretableCall interface method.
|
|
func (fn *evalVarArgs) OverloadID() string {
|
|
return fn.overload
|
|
}
|
|
|
|
// Args returns the argument to the unary function.
|
|
func (fn *evalVarArgs) Args() []Interpretable {
|
|
return fn.args
|
|
}
|
|
|
|
type evalList struct {
|
|
id int64
|
|
elems []Interpretable
|
|
optionals []bool
|
|
hasOptionals bool
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (l *evalList) ID() int64 {
|
|
return l.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (l *evalList) Eval(ctx Activation) ref.Val {
|
|
elemVals := make([]ref.Val, 0, len(l.elems))
|
|
// If any argument is unknown or error early terminate.
|
|
for i, elem := range l.elems {
|
|
elemVal := elem.Eval(ctx)
|
|
if types.IsUnknownOrError(elemVal) {
|
|
return elemVal
|
|
}
|
|
if l.hasOptionals && l.optionals[i] {
|
|
optVal, ok := elemVal.(*types.Optional)
|
|
if !ok {
|
|
return invalidOptionalElementInit(elemVal)
|
|
}
|
|
if !optVal.HasValue() {
|
|
continue
|
|
}
|
|
elemVal = optVal.GetValue()
|
|
}
|
|
elemVals = append(elemVals, elemVal)
|
|
}
|
|
return l.adapter.NativeToValue(elemVals)
|
|
}
|
|
|
|
func (l *evalList) InitVals() []Interpretable {
|
|
return l.elems
|
|
}
|
|
|
|
func (l *evalList) Type() ref.Type {
|
|
return types.ListType
|
|
}
|
|
|
|
type evalMap struct {
|
|
id int64
|
|
keys []Interpretable
|
|
vals []Interpretable
|
|
optionals []bool
|
|
hasOptionals bool
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (m *evalMap) ID() int64 {
|
|
return m.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (m *evalMap) Eval(ctx Activation) ref.Val {
|
|
entries := make(map[ref.Val]ref.Val)
|
|
// If any argument is unknown or error early terminate.
|
|
for i, key := range m.keys {
|
|
keyVal := key.Eval(ctx)
|
|
if types.IsUnknownOrError(keyVal) {
|
|
return keyVal
|
|
}
|
|
valVal := m.vals[i].Eval(ctx)
|
|
if types.IsUnknownOrError(valVal) {
|
|
return valVal
|
|
}
|
|
if m.hasOptionals && m.optionals[i] {
|
|
optVal, ok := valVal.(*types.Optional)
|
|
if !ok {
|
|
return invalidOptionalEntryInit(keyVal, valVal)
|
|
}
|
|
if !optVal.HasValue() {
|
|
delete(entries, keyVal)
|
|
continue
|
|
}
|
|
valVal = optVal.GetValue()
|
|
}
|
|
entries[keyVal] = valVal
|
|
}
|
|
return m.adapter.NativeToValue(entries)
|
|
}
|
|
|
|
func (m *evalMap) InitVals() []Interpretable {
|
|
if len(m.keys) != len(m.vals) {
|
|
return nil
|
|
}
|
|
result := make([]Interpretable, len(m.keys)+len(m.vals))
|
|
idx := 0
|
|
for i, k := range m.keys {
|
|
v := m.vals[i]
|
|
result[idx] = k
|
|
idx++
|
|
result[idx] = v
|
|
idx++
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (m *evalMap) Type() ref.Type {
|
|
return types.MapType
|
|
}
|
|
|
|
type evalObj struct {
|
|
id int64
|
|
typeName string
|
|
fields []string
|
|
vals []Interpretable
|
|
optionals []bool
|
|
hasOptionals bool
|
|
provider ref.TypeProvider
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (o *evalObj) ID() int64 {
|
|
return o.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (o *evalObj) Eval(ctx Activation) ref.Val {
|
|
fieldVals := make(map[string]ref.Val)
|
|
// If any argument is unknown or error early terminate.
|
|
for i, field := range o.fields {
|
|
val := o.vals[i].Eval(ctx)
|
|
if types.IsUnknownOrError(val) {
|
|
return val
|
|
}
|
|
if o.hasOptionals && o.optionals[i] {
|
|
optVal, ok := val.(*types.Optional)
|
|
if !ok {
|
|
return invalidOptionalEntryInit(field, val)
|
|
}
|
|
if !optVal.HasValue() {
|
|
delete(fieldVals, field)
|
|
continue
|
|
}
|
|
val = optVal.GetValue()
|
|
}
|
|
fieldVals[field] = val
|
|
}
|
|
return o.provider.NewValue(o.typeName, fieldVals)
|
|
}
|
|
|
|
func (o *evalObj) InitVals() []Interpretable {
|
|
return o.vals
|
|
}
|
|
|
|
func (o *evalObj) Type() ref.Type {
|
|
return types.NewObjectTypeValue(o.typeName)
|
|
}
|
|
|
|
type evalFold struct {
|
|
id int64
|
|
accuVar string
|
|
iterVar string
|
|
iterRange Interpretable
|
|
accu Interpretable
|
|
cond Interpretable
|
|
step Interpretable
|
|
result Interpretable
|
|
adapter ref.TypeAdapter
|
|
exhaustive bool
|
|
interruptable bool
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (fold *evalFold) ID() int64 {
|
|
return fold.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (fold *evalFold) Eval(ctx Activation) ref.Val {
|
|
foldRange := fold.iterRange.Eval(ctx)
|
|
if !foldRange.Type().HasTrait(traits.IterableType) {
|
|
return types.ValOrErr(foldRange, "got '%T', expected iterable type", foldRange)
|
|
}
|
|
// Configure the fold activation with the accumulator initial value.
|
|
accuCtx := varActivationPool.Get().(*varActivation)
|
|
accuCtx.parent = ctx
|
|
accuCtx.name = fold.accuVar
|
|
accuCtx.val = fold.accu.Eval(ctx)
|
|
// If the accumulator starts as an empty list, then the comprehension will build a list
|
|
// so create a mutable list to optimize the cost of the inner loop.
|
|
l, ok := accuCtx.val.(traits.Lister)
|
|
buildingList := false
|
|
if !fold.exhaustive && ok && l.Size() == types.IntZero {
|
|
buildingList = true
|
|
accuCtx.val = types.NewMutableList(fold.adapter)
|
|
}
|
|
iterCtx := varActivationPool.Get().(*varActivation)
|
|
iterCtx.parent = accuCtx
|
|
iterCtx.name = fold.iterVar
|
|
|
|
interrupted := false
|
|
it := foldRange.(traits.Iterable).Iterator()
|
|
for it.HasNext() == types.True {
|
|
// Modify the iter var in the fold activation.
|
|
iterCtx.val = it.Next()
|
|
|
|
// Evaluate the condition, terminate the loop if false.
|
|
cond := fold.cond.Eval(iterCtx)
|
|
condBool, ok := cond.(types.Bool)
|
|
if !fold.exhaustive && ok && condBool != types.True {
|
|
break
|
|
}
|
|
// Evaluate the evaluation step into accu var.
|
|
accuCtx.val = fold.step.Eval(iterCtx)
|
|
if fold.interruptable {
|
|
if stop, found := ctx.ResolveName("#interrupted"); found && stop == true {
|
|
interrupted = true
|
|
break
|
|
}
|
|
}
|
|
}
|
|
varActivationPool.Put(iterCtx)
|
|
if interrupted {
|
|
varActivationPool.Put(accuCtx)
|
|
return types.NewErr("operation interrupted")
|
|
}
|
|
|
|
// Compute the result.
|
|
res := fold.result.Eval(accuCtx)
|
|
varActivationPool.Put(accuCtx)
|
|
// Convert a mutable list to an immutable one, if the comprehension has generated a list as a result.
|
|
if !types.IsUnknownOrError(res) && buildingList {
|
|
if _, ok := res.(traits.MutableLister); ok {
|
|
res = res.(traits.MutableLister).ToImmutableList()
|
|
}
|
|
}
|
|
return res
|
|
}
|
|
|
|
// Optional Interpretable implementations that specialize, subsume, or extend the core evaluation
|
|
// plan via decorators.
|
|
|
|
// evalSetMembership is an Interpretable implementation which tests whether an input value
|
|
// exists within the set of map keys used to model a set.
|
|
type evalSetMembership struct {
|
|
inst Interpretable
|
|
arg Interpretable
|
|
valueSet map[ref.Val]ref.Val
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (e *evalSetMembership) ID() int64 {
|
|
return e.inst.ID()
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (e *evalSetMembership) Eval(ctx Activation) ref.Val {
|
|
val := e.arg.Eval(ctx)
|
|
if types.IsUnknownOrError(val) {
|
|
return val
|
|
}
|
|
if ret, found := e.valueSet[val]; found {
|
|
return ret
|
|
}
|
|
return types.False
|
|
}
|
|
|
|
// evalWatch is an Interpretable implementation that wraps the execution of a given
|
|
// expression so that it may observe the computed value and send it to an observer.
|
|
type evalWatch struct {
|
|
Interpretable
|
|
observer EvalObserver
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (e *evalWatch) Eval(ctx Activation) ref.Val {
|
|
val := e.Interpretable.Eval(ctx)
|
|
e.observer(e.ID(), e.Interpretable, val)
|
|
return val
|
|
}
|
|
|
|
// evalWatchAttr describes a watcher of an InterpretableAttribute Interpretable.
|
|
//
|
|
// Since the watcher may be selected against at a later stage in program planning, the watcher
|
|
// must implement the InterpretableAttribute interface by proxy.
|
|
type evalWatchAttr struct {
|
|
InterpretableAttribute
|
|
observer EvalObserver
|
|
}
|
|
|
|
// AddQualifier creates a wrapper over the incoming qualifier which observes the qualification
|
|
// result.
|
|
func (e *evalWatchAttr) AddQualifier(q Qualifier) (Attribute, error) {
|
|
cq, isConst := q.(ConstantQualifier)
|
|
if isConst {
|
|
q = &evalWatchConstQual{
|
|
ConstantQualifier: cq,
|
|
observer: e.observer,
|
|
adapter: e.InterpretableAttribute.Adapter(),
|
|
}
|
|
} else {
|
|
q = &evalWatchQual{
|
|
Qualifier: q,
|
|
observer: e.observer,
|
|
adapter: e.InterpretableAttribute.Adapter(),
|
|
}
|
|
}
|
|
_, err := e.InterpretableAttribute.AddQualifier(q)
|
|
return e, err
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (e *evalWatchAttr) Eval(vars Activation) ref.Val {
|
|
val := e.InterpretableAttribute.Eval(vars)
|
|
e.observer(e.ID(), e.InterpretableAttribute, val)
|
|
return val
|
|
}
|
|
|
|
// evalWatchConstQual observes the qualification of an object using a constant boolean, int,
|
|
// string, or uint.
|
|
type evalWatchConstQual struct {
|
|
ConstantQualifier
|
|
observer EvalObserver
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// Qualify observes the qualification of a object via a constant boolean, int, string, or uint.
|
|
func (e *evalWatchConstQual) Qualify(vars Activation, obj any) (any, error) {
|
|
out, err := e.ConstantQualifier.Qualify(vars, obj)
|
|
var val ref.Val
|
|
if err != nil {
|
|
val = types.WrapErr(err)
|
|
} else {
|
|
val = e.adapter.NativeToValue(out)
|
|
}
|
|
e.observer(e.ID(), e.ConstantQualifier, val)
|
|
return out, err
|
|
}
|
|
|
|
// QualifyIfPresent conditionally qualifies the variable and only records a value if one is present.
|
|
func (e *evalWatchConstQual) QualifyIfPresent(vars Activation, obj any, presenceOnly bool) (any, bool, error) {
|
|
out, present, err := e.ConstantQualifier.QualifyIfPresent(vars, obj, presenceOnly)
|
|
var val ref.Val
|
|
if err != nil {
|
|
val = types.WrapErr(err)
|
|
} else if out != nil {
|
|
val = e.adapter.NativeToValue(out)
|
|
} else if presenceOnly {
|
|
val = types.Bool(present)
|
|
}
|
|
if present || presenceOnly {
|
|
e.observer(e.ID(), e.ConstantQualifier, val)
|
|
}
|
|
return out, present, err
|
|
}
|
|
|
|
// QualifierValueEquals tests whether the incoming value is equal to the qualifying constant.
|
|
func (e *evalWatchConstQual) QualifierValueEquals(value any) bool {
|
|
qve, ok := e.ConstantQualifier.(qualifierValueEquator)
|
|
return ok && qve.QualifierValueEquals(value)
|
|
}
|
|
|
|
// evalWatchQual observes the qualification of an object by a value computed at runtime.
|
|
type evalWatchQual struct {
|
|
Qualifier
|
|
observer EvalObserver
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// Qualify observes the qualification of a object via a value computed at runtime.
|
|
func (e *evalWatchQual) Qualify(vars Activation, obj any) (any, error) {
|
|
out, err := e.Qualifier.Qualify(vars, obj)
|
|
var val ref.Val
|
|
if err != nil {
|
|
val = types.WrapErr(err)
|
|
} else {
|
|
val = e.adapter.NativeToValue(out)
|
|
}
|
|
e.observer(e.ID(), e.Qualifier, val)
|
|
return out, err
|
|
}
|
|
|
|
// QualifyIfPresent conditionally qualifies the variable and only records a value if one is present.
|
|
func (e *evalWatchQual) QualifyIfPresent(vars Activation, obj any, presenceOnly bool) (any, bool, error) {
|
|
out, present, err := e.Qualifier.QualifyIfPresent(vars, obj, presenceOnly)
|
|
var val ref.Val
|
|
if err != nil {
|
|
val = types.WrapErr(err)
|
|
} else if out != nil {
|
|
val = e.adapter.NativeToValue(out)
|
|
} else if presenceOnly {
|
|
val = types.Bool(present)
|
|
}
|
|
if present || presenceOnly {
|
|
e.observer(e.ID(), e.Qualifier, val)
|
|
}
|
|
return out, present, err
|
|
}
|
|
|
|
// evalWatchConst describes a watcher of an instConst Interpretable.
|
|
type evalWatchConst struct {
|
|
InterpretableConst
|
|
observer EvalObserver
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (e *evalWatchConst) Eval(vars Activation) ref.Val {
|
|
val := e.Value()
|
|
e.observer(e.ID(), e.InterpretableConst, val)
|
|
return val
|
|
}
|
|
|
|
// evalExhaustiveOr is just like evalOr, but does not short-circuit argument evaluation.
|
|
type evalExhaustiveOr struct {
|
|
id int64
|
|
lhs Interpretable
|
|
rhs Interpretable
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (or *evalExhaustiveOr) ID() int64 {
|
|
return or.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (or *evalExhaustiveOr) Eval(ctx Activation) ref.Val {
|
|
lVal := or.lhs.Eval(ctx)
|
|
rVal := or.rhs.Eval(ctx)
|
|
lBool, lok := lVal.(types.Bool)
|
|
if lok && lBool == types.True {
|
|
return types.True
|
|
}
|
|
rBool, rok := rVal.(types.Bool)
|
|
if rok && rBool == types.True {
|
|
return types.True
|
|
}
|
|
if lok && rok {
|
|
return types.False
|
|
}
|
|
if types.IsUnknown(lVal) {
|
|
return lVal
|
|
}
|
|
if types.IsUnknown(rVal) {
|
|
return rVal
|
|
}
|
|
// TODO: Combine the errors into a set in the future.
|
|
// If the left-hand side is non-boolean return it as the error.
|
|
if types.IsError(lVal) {
|
|
return lVal
|
|
}
|
|
return types.MaybeNoSuchOverloadErr(rVal)
|
|
}
|
|
|
|
// evalExhaustiveAnd is just like evalAnd, but does not short-circuit argument evaluation.
|
|
type evalExhaustiveAnd struct {
|
|
id int64
|
|
lhs Interpretable
|
|
rhs Interpretable
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (and *evalExhaustiveAnd) ID() int64 {
|
|
return and.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (and *evalExhaustiveAnd) Eval(ctx Activation) ref.Val {
|
|
lVal := and.lhs.Eval(ctx)
|
|
rVal := and.rhs.Eval(ctx)
|
|
lBool, lok := lVal.(types.Bool)
|
|
if lok && lBool == types.False {
|
|
return types.False
|
|
}
|
|
rBool, rok := rVal.(types.Bool)
|
|
if rok && rBool == types.False {
|
|
return types.False
|
|
}
|
|
if lok && rok {
|
|
return types.True
|
|
}
|
|
if types.IsUnknown(lVal) {
|
|
return lVal
|
|
}
|
|
if types.IsUnknown(rVal) {
|
|
return rVal
|
|
}
|
|
// TODO: Combine the errors into a set in the future.
|
|
// If the left-hand side is non-boolean return it as the error.
|
|
if types.IsError(lVal) {
|
|
return lVal
|
|
}
|
|
return types.MaybeNoSuchOverloadErr(rVal)
|
|
}
|
|
|
|
// evalExhaustiveConditional is like evalConditional, but does not short-circuit argument
|
|
// evaluation.
|
|
type evalExhaustiveConditional struct {
|
|
id int64
|
|
adapter ref.TypeAdapter
|
|
attr *conditionalAttribute
|
|
}
|
|
|
|
// ID implements the Interpretable interface method.
|
|
func (cond *evalExhaustiveConditional) ID() int64 {
|
|
return cond.id
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (cond *evalExhaustiveConditional) Eval(ctx Activation) ref.Val {
|
|
cVal := cond.attr.expr.Eval(ctx)
|
|
tVal, tErr := cond.attr.truthy.Resolve(ctx)
|
|
fVal, fErr := cond.attr.falsy.Resolve(ctx)
|
|
cBool, ok := cVal.(types.Bool)
|
|
if !ok {
|
|
return types.ValOrErr(cVal, "no such overload")
|
|
}
|
|
if cBool {
|
|
if tErr != nil {
|
|
return types.WrapErr(tErr)
|
|
}
|
|
return cond.adapter.NativeToValue(tVal)
|
|
}
|
|
if fErr != nil {
|
|
return types.WrapErr(fErr)
|
|
}
|
|
return cond.adapter.NativeToValue(fVal)
|
|
}
|
|
|
|
// evalAttr evaluates an Attribute value.
|
|
type evalAttr struct {
|
|
adapter ref.TypeAdapter
|
|
attr Attribute
|
|
optional bool
|
|
}
|
|
|
|
var _ InterpretableAttribute = &evalAttr{}
|
|
|
|
// ID of the attribute instruction.
|
|
func (a *evalAttr) ID() int64 {
|
|
return a.attr.ID()
|
|
}
|
|
|
|
// AddQualifier implements the InterpretableAttribute interface method.
|
|
func (a *evalAttr) AddQualifier(qual Qualifier) (Attribute, error) {
|
|
attr, err := a.attr.AddQualifier(qual)
|
|
a.attr = attr
|
|
return attr, err
|
|
}
|
|
|
|
// Attr implements the InterpretableAttribute interface method.
|
|
func (a *evalAttr) Attr() Attribute {
|
|
return a.attr
|
|
}
|
|
|
|
// Adapter implements the InterpretableAttribute interface method.
|
|
func (a *evalAttr) Adapter() ref.TypeAdapter {
|
|
return a.adapter
|
|
}
|
|
|
|
// Eval implements the Interpretable interface method.
|
|
func (a *evalAttr) Eval(ctx Activation) ref.Val {
|
|
v, err := a.attr.Resolve(ctx)
|
|
if err != nil {
|
|
return types.WrapErr(err)
|
|
}
|
|
return a.adapter.NativeToValue(v)
|
|
}
|
|
|
|
// Qualify proxies to the Attribute's Qualify method.
|
|
func (a *evalAttr) Qualify(ctx Activation, obj any) (any, error) {
|
|
return a.attr.Qualify(ctx, obj)
|
|
}
|
|
|
|
// QualifyIfPresent proxies to the Attribute's QualifyIfPresent method.
|
|
func (a *evalAttr) QualifyIfPresent(ctx Activation, obj any, presenceOnly bool) (any, bool, error) {
|
|
return a.attr.QualifyIfPresent(ctx, obj, presenceOnly)
|
|
}
|
|
|
|
func (a *evalAttr) IsOptional() bool {
|
|
return a.optional
|
|
}
|
|
|
|
// Resolve proxies to the Attribute's Resolve method.
|
|
func (a *evalAttr) Resolve(ctx Activation) (any, error) {
|
|
return a.attr.Resolve(ctx)
|
|
}
|
|
|
|
type evalWatchConstructor struct {
|
|
constructor InterpretableConstructor
|
|
observer EvalObserver
|
|
}
|
|
|
|
// InitVals implements the InterpretableConstructor InitVals function.
|
|
func (c *evalWatchConstructor) InitVals() []Interpretable {
|
|
return c.constructor.InitVals()
|
|
}
|
|
|
|
// Type implements the InterpretableConstructor Type function.
|
|
func (c *evalWatchConstructor) Type() ref.Type {
|
|
return c.constructor.Type()
|
|
}
|
|
|
|
// ID implements the Interpretable ID function.
|
|
func (c *evalWatchConstructor) ID() int64 {
|
|
return c.constructor.ID()
|
|
}
|
|
|
|
// Eval implements the Interpretable Eval function.
|
|
func (c *evalWatchConstructor) Eval(ctx Activation) ref.Val {
|
|
val := c.constructor.Eval(ctx)
|
|
c.observer(c.ID(), c.constructor, val)
|
|
return val
|
|
}
|
|
|
|
func invalidOptionalEntryInit(field any, value ref.Val) ref.Val {
|
|
return types.NewErr("cannot initialize optional entry '%v' from non-optional value %v", field, value)
|
|
}
|
|
|
|
func invalidOptionalElementInit(value ref.Val) ref.Val {
|
|
return types.NewErr("cannot initialize optional list element from non-optional value %v", value)
|
|
}
|