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// Package parsers provides helper functions to parse and validate different type
// of string. It can be hosts, unix addresses, tcp addresses, filters, kernel
// operating system versions.
package parsers // import "github.com/docker/docker/pkg/parsers"
import (
"fmt"
"strconv"
"strings"
)
// ParseKeyValueOpt parses and validates the specified string as a key/value
// pair (key=value).
func ParseKeyValueOpt(opt string) (key string, value string, err error) {
k, v, ok := strings.Cut(opt, "=")
if !ok {
return "", "", fmt.Errorf("unable to parse key/value option: %s", opt)
}
return strings.TrimSpace(k), strings.TrimSpace(v), nil
}
// ParseUintListMaximum parses and validates the specified string as the value
// found in some cgroup file (e.g. `cpuset.cpus`, `cpuset.mems`), which could be
// one of the formats below. Note that duplicates are actually allowed in the
// input string. It returns a `map[int]bool` with available elements from `val`
// set to `true`. Values larger than `maximum` cause an error if max is non zero,
// in order to stop the map becoming excessively large.
// Supported formats:
//
// 7
// 1-6
// 0,3-4,7,8-10
// 0-0,0,1-7
// 03,1-3 <- this is gonna get parsed as [1,2,3]
// 3,2,1
// 0-2,3,1
func ParseUintListMaximum(val string, maximum int) (map[int]bool, error) {
return parseUintList(val, maximum)
}
// ParseUintList parses and validates the specified string as the value
// found in some cgroup file (e.g. `cpuset.cpus`, `cpuset.mems`), which could be
// one of the formats below. Note that duplicates are actually allowed in the
// input string. It returns a `map[int]bool` with available elements from `val`
// set to `true`.
// Supported formats:
//
// 7
// 1-6
// 0,3-4,7,8-10
// 0-0,0,1-7
// 03,1-3 <- this is gonna get parsed as [1,2,3]
// 3,2,1
// 0-2,3,1
func ParseUintList(val string) (map[int]bool, error) {
return parseUintList(val, 0)
}
func parseUintList(val string, maximum int) (map[int]bool, error) {
if val == "" {
return map[int]bool{}, nil
}
availableInts := make(map[int]bool)
split := strings.Split(val, ",")
errInvalidFormat := fmt.Errorf("invalid format: %s", val)
for _, r := range split {
if !strings.Contains(r, "-") {
v, err := strconv.Atoi(r)
if err != nil {
return nil, errInvalidFormat
}
if maximum != 0 && v > maximum {
return nil, fmt.Errorf("value of out range, maximum is %d", maximum)
}
availableInts[v] = true
} else {
minS, maxS, _ := strings.Cut(r, "-")
min, err := strconv.Atoi(minS)
if err != nil {
return nil, errInvalidFormat
}
max, err := strconv.Atoi(maxS)
if err != nil {
return nil, errInvalidFormat
}
if max < min {
return nil, errInvalidFormat
}
if maximum != 0 && max > maximum {
return nil, fmt.Errorf("value of out range, maximum is %d", maximum)
}
for i := min; i <= max; i++ {
availableInts[i] = true
}
}
}
return availableInts, nil
}
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