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// Copyright 2023 The Bazel Authors. All rights reserved.
//
// 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 pythonconfig
import (
"fmt"
"sort"
"strings"
)
// StringSet satisfies the flag.Value interface. It constructs a set backed by
// a hashmap by parsing the flag string value using the provided separator.
type StringSet struct {
set map[string]struct{}
separator string
}
// NewStringSet constructs a new StringSet with the given separator.
func NewStringSet(separator string) *StringSet {
return &StringSet{
set: make(map[string]struct{}),
separator: separator,
}
}
// String satisfies flag.Value.String.
func (ss *StringSet) String() string {
keys := make([]string, 0, len(ss.set))
for key := range ss.set {
keys = append(keys, key)
}
return fmt.Sprintf("%v", sort.StringSlice(keys))
}
// Set satisfies flag.Value.Set.
func (ss *StringSet) Set(s string) error {
list := strings.Split(s, ss.separator)
for _, v := range list {
trimmed := strings.TrimSpace(v)
if trimmed == "" {
continue
}
ss.set[trimmed] = struct{}{}
}
return nil
}
// Contains returns whether the StringSet contains the provided element or not.
func (ss *StringSet) Contains(s string) bool {
_, contains := ss.set[s]
return contains
}
// StringMapList satisfies the flag.Value interface. It constructs a string map
// by parsing the flag string value using the provided list and map separators.
type StringMapList struct {
mapping map[string]string
listSeparator string
mapSeparator string
}
// NewStringMapList constructs a new StringMapList with the given separators.
func NewStringMapList(listSeparator, mapSeparator string) *StringMapList {
return &StringMapList{
mapping: make(map[string]string),
listSeparator: listSeparator,
mapSeparator: mapSeparator,
}
}
// String satisfies flag.Value.String.
func (sml *StringMapList) String() string {
return fmt.Sprintf("%v", sml.mapping)
}
// Set satisfies flag.Value.Set.
func (sml *StringMapList) Set(s string) error {
list := strings.Split(s, sml.listSeparator)
for _, v := range list {
trimmed := strings.TrimSpace(v)
if trimmed == "" {
continue
}
mapList := strings.SplitN(trimmed, sml.mapSeparator, 2)
if len(mapList) < 2 {
return fmt.Errorf(
"%q is not a valid map using %q as a separator",
trimmed, sml.mapSeparator,
)
}
key := mapList[0]
if _, exists := sml.mapping[key]; exists {
return fmt.Errorf("key %q already set", key)
}
val := mapList[1]
sml.mapping[key] = val
}
return nil
}
// Get returns the value for the given key.
func (sml *StringMapList) Get(key string) (string, bool) {
val, exists := sml.mapping[key]
return val, exists
}
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