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func.go
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func.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ast
import (
config "istio.io/api/policy/v1beta1"
)
// FunctionMetadata contains type metadata for functions.
type FunctionMetadata struct {
// Name is the name of the function.
Name string
// Instance indicates that this is an instance method.
Instance bool
// TargetType is the type of the instance method target, if this function is an instance method.
TargetType config.ValueType
// ReturnType is the return type of the function.
ReturnType config.ValueType
// ArgumentTypes is the types of the arguments in the order that is expected by the function.
ArgumentTypes []config.ValueType
}
func intrinsics() []FunctionMetadata {
return []FunctionMetadata{
{
Name: "EQ",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "NEQ",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "LT",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "LEQ",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "GT",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "GEQ",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "OR",
ReturnType: config.VALUE_TYPE_UNSPECIFIED,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "LOR",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.BOOL, config.BOOL},
},
{
Name: "LAND",
ReturnType: config.BOOL,
ArgumentTypes: []config.ValueType{config.BOOL, config.BOOL},
},
{
Name: "INDEX",
ReturnType: config.STRING,
ArgumentTypes: []config.ValueType{config.STRING_MAP, config.STRING},
},
{
Name: "conditional",
ReturnType: config.VALUE_TYPE_UNSPECIFIED,
ArgumentTypes: []config.ValueType{config.BOOL, config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "ADD",
ReturnType: config.VALUE_TYPE_UNSPECIFIED,
ArgumentTypes: []config.ValueType{config.VALUE_TYPE_UNSPECIFIED, config.VALUE_TYPE_UNSPECIFIED},
},
{
Name: "size",
ReturnType: config.INT64,
ArgumentTypes: []config.ValueType{config.STRING},
},
}
}
// FuncMap generates a full function map, combining the intrinsic functions needed for type-checking,
// along with external functions that are supplied as the functions parameter.
func FuncMap(functions []FunctionMetadata) map[string]FunctionMetadata {
m := make(map[string]FunctionMetadata)
for _, fn := range intrinsics() {
m[fn.Name] = fn
}
for _, fn := range functions {
m[fn.Name] = fn
}
return m
}