/
collections.go
1131 lines (1081 loc) · 27 KB
/
collections.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 lib
import (
"reflect"
"sort"
"strings"
"github.com/google/cel-go/cel"
"github.com/google/cel-go/checker/decls"
"github.com/google/cel-go/common"
"github.com/google/cel-go/common/ast"
"github.com/google/cel-go/common/operators"
"github.com/google/cel-go/common/types"
"github.com/google/cel-go/common/types/ref"
"github.com/google/cel-go/common/types/traits"
"github.com/google/cel-go/interpreter/functions"
"github.com/google/cel-go/parser"
expr "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
)
// Collections returns a cel.EnvOption to configure extended functions for
// handling collections.
//
// As (Macro)
//
// The as macro is syntactic sugar for [val].map(var, function)[0].
//
// Examples:
//
// {"a":1, "b":2}.as(v, v.a == 1) // return true
// {"a":1, "b":2}.as(v, v) // return {"a":1, "b":2}
// {"a":1, "b":2}.as(v, v.with({"c":3})) // return {"a":1, "b":2, "c":3}
// {"a":1, "b":2}.as(v, [v, v]) // return [{"a":1, "b":2}, {"a":1, "b":2}]
//
// # Collate
//
// Returns a list of values obtained by traversing fields in the receiver with
// the path or paths given as the string parameter. When a list is traversed all
// children are include in the resulting list:
//
// <list<dyn>>.collate(<string>) -> <list<dyn>>
// <list<dyn>>.collate(<list<string>>) -> <list<dyn>>
// <map<string,dyn>>.collate(<string>) -> <list<dyn>>
// <map<string,dyn>>.collate(<list<string>>) -> <list<dyn>>
//
// Examples:
//
// Given v:
// {
// "a": [
// {"b": 1},
// {"b": 2},
// {"b": 3}
// ],
// "b": [
// {"b": -1, "c": 10},
// {"b": -2, "c": 20},
// {"b": -3, "c": 30}
// ]
// }
//
// v.collate("a") // return [{"b": 1}, {"b": 2}, {"b": 3}]
// v.collate("a.b") // return [1, 2, 3]
// v.collate(["a.b", "b.b"]) // return [1, 2, 3, -1, -2, -3]
// v.collate(["a", "b.b"]) // return [{"b": 1 }, {"b": 2 }, {"b": 3 }, -1, -2, -3 ]
//
// If the the path to be dropped includes a dot, it can be escaped with a literal
// backslash. See drop below.
//
// # Drop
//
// Returns the value of the receiver with the object at the given paths remove:
//
// <list<dyn>>.drop(<string>) -> <list<dyn>>
// <list<dyn>>.drop(<list<string>>) -> <list<dyn>>
// <map<string,dyn>>.drop(<string>) -> <map<string,dyn>>
// <map<string,dyn>>.drop(<list<string>>) -> <map<string,dyn>>
//
// Examples:
//
// Given v:
// {
// "a": [
// {"b": 1},
// {"b": 2},
// {"b": 3}
// ],
// "b": [
// {"b": -1, "c": 10},
// {"b": -2, "c": 20},
// {"b": -3, "c": 30}
// ]
// }
//
// v.drop("a") // return {"b": [{"b": -1, "c": 10}, {"b": -2, "c": 20}, {"b": -3, "c": 30}]}
// v.drop("a.b") // return {"a": [{}, {}, {}], "b": [{"b": -1, "c": 10}, {"b": -2, "c": 20}, {"b": -3, "c": 30}]}
// v.drop(["a.b", "b.b"]) // return {"a": [{}, {}, {}], "b": [{"c": 10}, {"c": 20}, {"c": 30}]}
// v.drop(["a", "b.b"]) // return {"b": [{"c": 10}, {"c": 20}, {"c": 30}]}
//
// If the the path to be dropped includes a dot, it can be escaped with a literal
// backslash.
//
// Examples:
//
// Given v:
// {
// "dotted.path": [
// {"b": -1, "c": 10},
// {"b": -2, "c": 20},
// {"b": -3, "c": 30}
// ]
// }
//
// v.drop("dotted\\.path.b") // return {"dotted.path": [{"c": 10}, {"c": 20}, {"c": 30}]}
//
// # Drop Empty
//
// Returns the value of the receiver with all empty lists and maps removed,
// recursively
//
// <list<dyn>>.drop_empty() -> <list<dyn>>
// <map<string,dyn>>.drop_empty() -> <map<string,dyn>>
//
// Examples:
//
// Given v:
// {
// "a": [
// {},
// {},
// {}
// ],
// "b": [
// {"b": -1, "c": 10},
// {"b": -2, "c": 20},
// {"b": -3, "c": 30}
// ]
// }
//
// v.drop_empty() // return {"b":[{"b":-1, "c":10}, {"b":-2, "c":20}, {"b":-3, "c":30}]}
//
// # Flatten
//
// Returns a list of non-list objects resulting from the depth-first
// traversal of a nested list:
//
// <list<dyn>...>.flatten() -> <list<dyn>>
//
// Examples:
//
// [[1],[2,3],[[[4]],[5,6]]].flatten() // return [1, 2, 3, 4, 5, 6]
// [[{"a":1,"b":[10, 11]}],[2,3],[[[4]],[5,6]]].flatten() // return [{"a":1, "b":[10, 11]}, 2, 3, 4, 5, 6]
//
// # Max
//
// Returns the maximum value of a list of comparable objects:
//
// <list<dyn>>.max() -> <dyn>
// max(<list<dyn>>) -> <dyn>
//
// Examples:
//
// [1,2,3,4,5,6,7].max() // return 7
// max([1,2,3,4,5,6,7]) // return 7
//
// # Min
//
// Returns the minimum value of a list of comparable objects:
//
// <list<dyn>>.min() -> <dyn>
// min(<list<dyn>>) -> <dyn>
//
// Examples:
//
// [1,2,3,4,5,6,7].min() // return 1
// min([1,2,3,4,5,6,7]) // return 1
//
// # With
//
// Returns the receiver's value with the value of the parameter updating
// or adding fields:
//
// <map<K,V>>.with(<map<K,V>>) -> <map<K,V>>
//
// Examples:
//
// {"a":1, "b":2}.with({"a":10, "c":3}) // return {"a":10, "b":2, "c":3}
//
// # With Replace
//
// Returns the receiver's value with the value of the parameter replacing
// existing fields:
//
// <map<K,V>>.with(<map<K,V>>) -> <map<K,V>>
//
// Examples:
//
// {"a":1, "b":2}.with({"a":10, "c":3}) // return {"a":10, "b":2}
//
// # With Update
//
// Returns the receiver's value with the value of the parameter updating
// the map without replacing any existing fields:
//
// <map<K,V>>.with(<map<K,V>>) -> <map<K,V>>
//
// Examples:
//
// {"a":1, "b":2}.with({"a":10, "c":3}) // return {"a":1, "b":2, "c":3}
//
// # Zip
//
// Returns a map keyed on elements of a list with values from another equally
// sized list:
//
// zip(<list<K>>, <list<V>>) -> <map<K,V>>
// <list<K>>.zip(<list<V>>) -> <map<K,V>>
//
// Examples:
//
// zip(["a", "b"], [1, 2]) // return {"a":1, "b":2}
// ["a", "b"].zip([1, 2]) // return {"a":1, "b":2}
//
// # Keys
//
// Returns a list of keys from a map:
//
// keys(<map<dyn,dyn>>) -> <list<dyn>>
// <map<dyn,dyn>>.keys() -> <list<dyn>>
//
// Examples:
//
// keys({"a":1, "b":2}) // return ["a", "b"]
// {1:"a", 2:"b"}.keys() // return [1, 2]
//
// # Values
//
// Returns a list of values from a map:
//
// values(<map<dyn,dyn>>) -> <list<dyn>>
// <map<dyn,dyn>>.values() -> <list<dyn>>
//
// Examples:
//
// values({"a":1, "b":2}) // return [1, 2]
// {1:"a", 2:"b"}.values() // return ["a", "b"]
func Collections() cel.EnvOption {
return cel.Lib(collectionsLib{})
}
type collectionsLib struct{}
func (collectionsLib) CompileOptions() []cel.EnvOption {
return []cel.EnvOption{
cel.Macros(parser.NewReceiverMacro("as", 2, makeAs)),
cel.Declarations(
decls.NewFunction("collate",
decls.NewParameterizedInstanceOverload(
"list_collate_string",
[]*expr.Type{decls.NewListType(decls.Dyn), decls.String},
listV,
[]string{"V"},
),
decls.NewParameterizedInstanceOverload(
"list_collate_list_string",
[]*expr.Type{decls.NewListType(decls.Dyn), decls.NewListType(decls.String)},
listV,
[]string{"V"},
),
decls.NewParameterizedInstanceOverload(
"map_collate_string",
[]*expr.Type{mapStringDyn, decls.String},
listV,
[]string{"V"},
),
decls.NewParameterizedInstanceOverload(
"map_collate_list_string",
[]*expr.Type{mapStringDyn, decls.NewListType(decls.String)},
listV,
[]string{"V"},
),
),
decls.NewFunction("drop",
decls.NewInstanceOverload(
"list_drop_string",
[]*expr.Type{decls.NewListType(decls.Dyn), decls.String},
decls.NewListType(decls.Dyn),
),
decls.NewInstanceOverload(
"list_drop_list_string",
[]*expr.Type{decls.NewListType(decls.Dyn), decls.NewListType(decls.String)},
decls.NewListType(decls.Dyn),
),
decls.NewInstanceOverload(
"map_drop_string",
[]*expr.Type{mapKV, decls.String},
mapKV,
),
decls.NewInstanceOverload(
"map_drop_list_string",
[]*expr.Type{mapKV, decls.NewListType(decls.String)},
mapKV,
),
),
decls.NewFunction("drop_empty",
decls.NewInstanceOverload(
"list_drop_empty",
[]*expr.Type{decls.NewListType(decls.Dyn)},
decls.NewListType(decls.Dyn),
),
decls.NewInstanceOverload(
"map_drop_empty",
[]*expr.Type{mapKV},
mapKV,
),
),
decls.NewFunction("flatten",
decls.NewInstanceOverload(
"list_flatten",
[]*expr.Type{decls.NewListType(decls.Dyn)},
decls.NewListType(decls.Dyn),
),
),
decls.NewFunction("max",
decls.NewParameterizedInstanceOverload(
"list_max",
[]*expr.Type{listV},
typeV,
[]string{"V"},
),
decls.NewParameterizedOverload(
"max_list",
[]*expr.Type{listV},
typeV,
[]string{"V"},
),
),
decls.NewFunction("min",
decls.NewParameterizedInstanceOverload(
"list_min",
[]*expr.Type{listV},
typeV,
[]string{"V"},
),
decls.NewParameterizedOverload(
"min_list",
[]*expr.Type{listV},
typeV,
[]string{"V"},
),
),
decls.NewFunction("with",
decls.NewParameterizedInstanceOverload(
"map_with_map",
[]*expr.Type{mapKV, mapKV},
mapKV,
[]string{"K", "V"},
),
),
decls.NewFunction("with_update",
decls.NewParameterizedInstanceOverload(
"map_with_update_map",
[]*expr.Type{mapKV, mapKV},
mapKV,
[]string{"K", "V"},
),
),
decls.NewFunction("with_replace",
decls.NewParameterizedInstanceOverload(
"map_with_replace_map",
[]*expr.Type{mapKV, mapKV},
mapKV,
[]string{"K", "V"},
),
),
decls.NewFunction("zip",
decls.NewParameterizedInstanceOverload(
"list_zip",
[]*expr.Type{listK, listV},
mapKV,
[]string{"K", "V"},
),
decls.NewParameterizedOverload(
"zip_list",
[]*expr.Type{listK, listV},
mapKV,
[]string{"K", "V"},
),
),
decls.NewFunction("keys",
decls.NewParameterizedInstanceOverload(
"map_keys",
[]*expr.Type{mapKV},
listK,
[]string{"K"},
),
decls.NewParameterizedOverload(
"keys_map",
[]*expr.Type{mapKV},
listK,
[]string{"K"},
),
),
decls.NewFunction("values",
decls.NewParameterizedInstanceOverload(
"map_values",
[]*expr.Type{mapKV},
listV,
[]string{"V"},
),
decls.NewParameterizedOverload(
"values_map",
[]*expr.Type{mapKV},
listV,
[]string{"V"},
),
),
),
}
}
func (collectionsLib) ProgramOptions() []cel.ProgramOption {
return []cel.ProgramOption{
cel.Functions(
&functions.Overload{
Operator: "list_collate_string",
Binary: collateFields,
},
&functions.Overload{
Operator: "list_collate_list_string",
Binary: collateFields,
},
&functions.Overload{
Operator: "map_collate_string",
Binary: collateFields,
},
&functions.Overload{
Operator: "map_collate_list_string",
Binary: collateFields,
},
),
cel.Functions(
&functions.Overload{
Operator: "list_drop_string",
Binary: dropFields,
},
&functions.Overload{
Operator: "list_drop_list_string",
Binary: dropFields,
},
&functions.Overload{
Operator: "map_drop_string",
Binary: dropFields,
},
&functions.Overload{
Operator: "map_drop_list_string",
Binary: dropFields,
},
),
cel.Functions(
&functions.Overload{
Operator: "list_drop_empty",
Unary: dropEmpty,
},
&functions.Overload{
Operator: "map_drop_empty",
Unary: dropEmpty,
},
),
cel.Functions(
&functions.Overload{
Operator: "list_flatten",
Unary: flatten,
},
),
cel.Functions(
&functions.Overload{
Operator: "min_list",
Unary: min,
},
&functions.Overload{
Operator: "list_min",
Unary: min,
},
),
cel.Functions(
&functions.Overload{
Operator: "max_list",
Unary: max,
},
&functions.Overload{
Operator: "list_max",
Unary: max,
},
),
cel.Functions(
&functions.Overload{
Operator: "map_with_map",
Binary: withAll,
},
&functions.Overload{
Operator: "map_with_update_map",
Binary: withUpdate,
},
&functions.Overload{
Operator: "map_with_replace_map",
Binary: withReplace,
},
),
cel.Functions(
&functions.Overload{
Operator: "zip_list",
Binary: zipLists,
},
&functions.Overload{
Operator: "list_zip",
Binary: zipLists,
},
),
cel.Functions(
&functions.Overload{
Operator: "map_keys",
Unary: mapKeys,
},
&functions.Overload{
Operator: "keys_map",
Unary: mapKeys,
},
),
cel.Functions(
&functions.Overload{
Operator: "map_values",
Unary: mapValues,
},
&functions.Overload{
Operator: "values_map",
Unary: mapValues,
},
),
}
}
func flatten(arg ref.Val) ref.Val {
obj := arg
l, ok := obj.(traits.Lister)
if !ok {
return types.ValOrErr(obj, "no such overload")
}
dst := types.NewMutableList(types.DefaultTypeAdapter)
flattenParts(dst, l)
return dst.ToImmutableList()
}
func flattenParts(dst traits.MutableLister, val traits.Lister) {
it := val.Iterator()
for it.HasNext().Value().(bool) {
if _, ok := it.Next().(traits.Lister); !ok {
dst.Add(val)
return
}
}
it = val.Iterator()
for it.HasNext() == types.True {
flattenParts(dst, it.Next().(traits.Lister))
}
}
func withAll(dst, src ref.Val) ref.Val {
new, other, err := with(dst, src)
if err != nil {
return err
}
for k, v := range other {
new[k] = v
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
}
func withUpdate(dst, src ref.Val) ref.Val {
new, other, err := with(dst, src)
if err != nil {
return err
}
for k, v := range other {
if _, ok := new[k]; ok {
continue
}
new[k] = v
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
}
func withReplace(dst, src ref.Val) ref.Val {
new, other, err := with(dst, src)
if err != nil {
return err
}
for k, v := range other {
if _, ok := new[k]; !ok {
continue
}
new[k] = v
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
}
var refValMap = reflect.TypeOf(map[ref.Val]ref.Val(nil))
func with(dst, src ref.Val) (res, other map[ref.Val]ref.Val, maybe ref.Val) {
obj, ok := dst.(traits.Mapper)
if !ok {
return nil, nil, types.ValOrErr(obj, "no such overload")
}
val, ok := src.(traits.Mapper)
if !ok {
return nil, nil, types.ValOrErr(src, "unsupported src type")
}
new := make(map[ref.Val]ref.Val)
m, err := obj.ConvertToNative(refValMap)
if err != nil {
return nil, nil, types.NewErr("unable to convert dst to native: %v", err)
}
for k, v := range m.(map[ref.Val]ref.Val) {
new[k] = v
}
m, err = val.ConvertToNative(refValMap)
if err != nil {
return nil, nil, types.NewErr("unable to convert src to native: %v", err)
}
return new, m.(map[ref.Val]ref.Val), nil
}
// TODO: Make this configurable to allow map, list and string emptiness and null.
func dropEmpty(val ref.Val) ref.Val {
obj, ok := val.(iterator)
if !ok || !hasEmpty(obj) {
return val
}
switch obj := val.(type) {
case traits.Lister:
new := make([]ref.Val, 0, obj.Size().Value().(int64))
it := obj.Iterator()
for it.HasNext() == types.True {
elem := it.Next()
switch val := elem.(type) {
case iterator:
if val.Size() != types.IntZero {
res := dropEmpty(val)
if v, ok := res.(traits.Sizer); ok {
if v.Size() != types.IntZero {
new = append(new, res)
}
} else {
new = append(new, res)
}
}
default:
new = append(new, val)
}
}
return types.NewRefValList(types.DefaultTypeAdapter, new)
case traits.Mapper:
new := make(map[ref.Val]ref.Val)
m, err := obj.ConvertToNative(refValMap)
if err != nil {
return types.NewErr("unable to convert map to native: %v", err)
}
for k, v := range m.(map[ref.Val]ref.Val) {
switch val := v.(type) {
case iterator:
if val.Size() != types.IntZero {
res := dropEmpty(v)
if v, ok := res.(traits.Sizer); ok {
if v.Size() != types.IntZero {
new[k] = res
}
} else {
new[k] = res
}
}
default:
new[k] = v
}
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
default:
// This should never happen since non-iterator
// types will have been returned in the preamble.
return val
}
}
// hasEmpty returns whether val is a map or a list that has any zero-sized
// map or list elements recursively. Zero sized strings are not considered
// to be empty.
func hasEmpty(val iterator) bool {
it := val.Iterator()
switch val := val.(type) {
case traits.Lister:
for it.HasNext() == types.True {
elem := it.Next()
iter, ok := elem.(iterator)
if !ok {
continue
}
if iter.Size() == types.IntZero || hasEmpty(iter) {
return true
}
}
case traits.Mapper:
for it.HasNext() == types.True {
elem := val.Get(it.Next())
iter, ok := elem.(iterator)
if !ok {
continue
}
if iter.Size() == types.IntZero || hasEmpty(iter) {
return true
}
}
}
return false
}
// iterator is the common interface for lists and maps required for dropEmpty.
type iterator interface {
ref.Val
traits.Iterable
traits.Sizer
}
func dropFields(obj, fields ref.Val) ref.Val {
switch fields := fields.(type) {
case types.String:
return dropFieldPath(obj, fields)
case traits.Lister:
it := fields.Iterator()
for it.HasNext() == types.True {
obj = dropFieldPath(obj, it.Next().ConvertToType(types.StringType).(types.String))
}
return obj
}
return types.NewErr("invalid parameter type for drop: %v", fields.Type())
}
func dropFieldPath(arg ref.Val, path types.String) (val ref.Val) {
defer func() {
switch err := recover().(type) {
case *types.Err:
val = err
}
}()
if !hasFieldPath(arg, path) {
return arg
}
switch obj := arg.(type) {
case traits.Lister:
new := make([]ref.Val, 0, obj.Size().Value().(int64))
it := obj.Iterator()
for it.HasNext() == types.True {
elem := it.Next()
new = append(new, dropFieldPath(elem, path))
}
return types.NewRefValList(types.DefaultTypeAdapter, new)
case traits.Mapper:
dotIdx, escaped := pathSepIndex(string(path))
switch {
case dotIdx == 0, dotIdx == len(path)-1:
return types.NewErr("invalid parameter path for drop: %s", path)
case dotIdx < 0:
new := make(map[ref.Val]ref.Val)
m, err := obj.ConvertToNative(refValMap)
if err != nil {
return types.NewErr("unable to convert map to native: %v", err)
}
for k, v := range m.(map[ref.Val]ref.Val) {
if k.Equal(path) == types.False {
new[k] = v
}
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
default:
new := make(map[ref.Val]ref.Val)
m, err := obj.ConvertToNative(refValMap)
if err != nil {
return types.NewErr("unable to convert map to native: %v", err)
}
head := path[:dotIdx]
if escaped {
head = types.String(strings.ReplaceAll(string(head), `\.`, "."))
}
tail := path[dotIdx+1:]
for k, v := range m.(map[ref.Val]ref.Val) {
if k.Equal(head) == types.True {
new[head] = dropFieldPath(v, tail)
} else {
new[k] = v
}
}
return types.NewRefValMap(types.DefaultTypeAdapter, new)
}
default:
return obj
}
}
func hasFieldPath(arg ref.Val, path types.String) bool {
switch obj := arg.(type) {
case traits.Lister:
it := obj.Iterator()
for it.HasNext() == types.True {
if hasFieldPath(it.Next(), path) {
return true
}
}
return false
case traits.Mapper:
dotIdx, escaped := pathSepIndex(string(path))
switch {
case dotIdx == 0, dotIdx == len(path)-1:
panic(types.NewErr("invalid parameter path for drop: %s", path))
case dotIdx < 0:
m, err := obj.ConvertToNative(refValMap)
if err != nil {
panic(types.NewErr("unable to convert map to native: %v", err))
}
for k := range m.(map[ref.Val]ref.Val) {
if k.Equal(path) == types.True {
return true
}
}
return false
default:
m, err := obj.ConvertToNative(refValMap)
if err != nil {
panic(types.NewErr("unable to convert map to native: %v", err))
}
head := path[:dotIdx]
if escaped {
head = types.String(strings.ReplaceAll(string(head), `\.`, "."))
}
tail := path[dotIdx+1:]
for k, v := range m.(map[ref.Val]ref.Val) {
if k.Equal(head) == types.True {
return hasFieldPath(v, tail)
}
}
return false
}
default:
return false
}
}
func collateFields(arg, fields ref.Val) (vals ref.Val) {
defer func() {
switch err := recover().(type) {
case *types.Err:
vals = err
}
}()
switch fields := fields.(type) {
case types.String:
return types.NewRefValList(types.DefaultTypeAdapter, collateFieldPath(arg, fields))
case traits.Lister:
var elems []ref.Val
it := fields.Iterator()
for it.HasNext() == types.True {
switch field := it.Next().(type) {
case types.String:
elems = append(elems, collateFieldPath(arg, field.ConvertToType(types.StringType).(types.String))...)
default:
return types.NewErr("invalid parameter type for collate fields: %v", field.Type())
}
}
return types.NewRefValList(types.DefaultTypeAdapter, elems)
}
return types.NewErr("invalid parameter type for collate: %v", fields.Type())
}
func collateFieldPath(arg ref.Val, path types.String) []ref.Val {
var collation []ref.Val
switch obj := arg.(type) {
case traits.Lister:
it := obj.Iterator()
for it.HasNext() == types.True {
elem := it.Next()
collation = append(collation, collateFieldPath(elem, path)...)
}
return collation
case traits.Mapper:
dotIdx, escaped := pathSepIndex(string(path))
switch {
case dotIdx == 0, dotIdx == len(path)-1:
panic(types.NewErr("invalid parameter path for drop: %s", path))
case dotIdx < 0:
m, err := obj.ConvertToNative(refValMap)
if err != nil {
panic(types.NewErr("unable to convert map to native: %v", err))
}
for k, v := range m.(map[ref.Val]ref.Val) {
if k.Equal(path) == types.True {
switch v := v.(type) {
case traits.Lister:
it := v.Iterator()
for it.HasNext() == types.True {
collation = append(collation, it.Next())
}
default:
collation = append(collation, v)
}
}
}
default:
m, err := obj.ConvertToNative(refValMap)
if err != nil {
panic(types.NewErr("unable to convert map to native: %v", err))
}
head := path[:dotIdx]
if escaped {
head = types.String(strings.ReplaceAll(string(head), `\.`, "."))
}
tail := path[dotIdx+1:]
for k, v := range m.(map[ref.Val]ref.Val) {
if k.Equal(head) == types.True {
collation = append(collation, collateFieldPath(v, tail)...)
}
}
}
default:
if path == "" {
collation = []ref.Val{obj}
}
}
return collation
}
func min(arg ref.Val) ref.Val {
return compare(arg, -1)
}
func max(arg ref.Val) ref.Val {
return compare(arg, 1)
}
func compare(arg ref.Val, cmp types.Int) ref.Val {
list, ok := arg.(traits.Lister)
if !ok {
return types.NoSuchOverloadErr()
}
type comparer interface {
ref.Val
traits.Comparer
}
var min comparer
it := list.Iterator()
for it.HasNext() == types.True {
elem, ok := it.Next().(comparer)
if !ok {
return types.NoSuchOverloadErr()
}
if min == nil || elem.Compare(min) == cmp {
min = elem
}