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|
package cli
import (
"fmt"
"strconv"
)
type Parser interface {
Match([]string) ([]string, bool)
Capture([]string) ([]string, map[string]string)
}
type CompleteParser struct {
parsers []Parser
}
func (self CompleteParser) Match(values []string) ([]string, bool) {
remainingValues := values
for _, parser := range self.parsers {
var ok bool
remainingValues, ok = parser.Match(remainingValues)
if !ok {
return remainingValues, false
}
}
return remainingValues, len(remainingValues) == 0
}
func (self CompleteParser) Capture(values []string) ([]string, map[string]string) {
remainingValues := values
data := map[string]string{}
for _, parser := range self.parsers {
var captured map[string]string
remainingValues, captured = parser.Capture(remainingValues)
for key, value := range captured {
data[key] = value
}
}
return remainingValues, data
}
func (self CompleteParser) String() string {
return fmt.Sprintf("CompleteParser %v", self.parsers)
}
type EqualParser struct {
value string
}
func (self EqualParser) Match(values []string) ([]string, bool) {
if len(values) == 0 {
return values, false
}
if self.value == values[0] {
return values[1:], true
}
return values, false
}
func (self EqualParser) Capture(values []string) ([]string, map[string]string) {
remainingValues, _ := self.Match(values)
return remainingValues, nil
}
func (self EqualParser) String() string {
return fmt.Sprintf("EqualParser '%s'", self.value)
}
type CaptureGroupParser struct {
value string
}
func (self CaptureGroupParser) Match(values []string) ([]string, bool) {
if len(values) == 0 {
return values, false
}
return values[1:], true
}
func (self CaptureGroupParser) key() string {
return self.value[1:len(self.value) - 1]
}
func (self CaptureGroupParser) Capture(values []string) ([]string, map[string]string) {
if remainingValues, ok := self.Match(values); ok {
return remainingValues, map[string]string{self.key(): values[0]}
}
return values, nil
}
func (self CaptureGroupParser) String() string {
return fmt.Sprintf("CaptureGroupParser '%s'", self.value)
}
type BoolFlagParser struct {
pattern string
key string
omitValue bool
defaultValue bool
}
func (self BoolFlagParser) Match(values []string) ([]string, bool) {
if self.omitValue {
if len(values) == 0 {
return values, false
}
if self.pattern == values[0] {
return values[1:], true
}
return values, false
} else {
if len(values) < 2 {
return values, false
}
if self.pattern != values[0] {
return values, false
}
// Check that value is a valid boolean
if _, err := strconv.ParseBool(values[1]); err != nil {
return values, false
}
return values[2:], true
}
}
func (self BoolFlagParser) Capture(values []string) ([]string, map[string]string) {
remainingValues, ok := self.Match(values)
if !ok && !self.omitValue {
return remainingValues, map[string]string{self.key: fmt.Sprintf("%t", self.defaultValue)}
}
return remainingValues, map[string]string{self.key: fmt.Sprintf("%t", ok)}
}
func (self BoolFlagParser) String() string {
return fmt.Sprintf("BoolFlagParser '%s'", self.pattern)
}
type StringFlagParser struct {
pattern string
key string
defaultValue string
}
func (self StringFlagParser) Match(values []string) ([]string, bool) {
if len(values) < 2 {
return values, false
}
if self.pattern != values[0] {
return values, false
}
return values[2:], true
}
func (self StringFlagParser) Capture(values []string) ([]string, map[string]string) {
remainingValues, ok := self.Match(values)
if ok {
return remainingValues, map[string]string{self.key: values[1]}
}
return values, map[string]string{self.key: self.defaultValue}
}
func (self StringFlagParser) String() string {
return fmt.Sprintf("StringFlagParser '%s'", self.pattern)
}
type IntFlagParser struct {
pattern string
key string
defaultValue int64
}
func (self IntFlagParser) Match(values []string) ([]string, bool) {
if len(values) < 2 {
return values, false
}
if self.pattern != values[0] {
return values, false
}
// Check that value is a valid integer
if _, err := strconv.ParseInt(values[1], 10, 64); err != nil {
return values, false
}
return values[2:], true
}
func (self IntFlagParser) Capture(values []string) ([]string, map[string]string) {
remainingValues, ok := self.Match(values)
if ok {
return remainingValues, map[string]string{self.key: values[1]}
}
return values, map[string]string{self.key: fmt.Sprintf("%d", self.defaultValue)}
}
func (self IntFlagParser) String() string {
return fmt.Sprintf("IntFlagParser '%s'", self.pattern)
}
type FlagParser struct {
parsers []Parser
}
func (self FlagParser) Match(values []string) ([]string, bool) {
remainingValues := values
var oneOrMoreMatches bool
for _, parser := range self.parsers {
var ok bool
remainingValues, ok = parser.Match(remainingValues)
if ok {
oneOrMoreMatches = true
}
}
// Recurse while we have one or more matches
if oneOrMoreMatches {
return self.Match(remainingValues)
}
return remainingValues, true
}
func (self FlagParser) Capture(values []string) ([]string, map[string]string) {
data := map[string]string{}
remainingValues := values
for _, parser := range self.parsers {
var captured map[string]string
remainingValues, captured = parser.Capture(remainingValues)
for key, value := range captured {
// Skip value if it already exists and new value is an empty string
if _, exists := data[key]; exists && value == "" {
continue
}
data[key] = value
}
}
return remainingValues, data
}
func (self FlagParser) String() string {
return fmt.Sprintf("FlagParser %v", self.parsers)
}
type ShortCircuitParser struct {
parsers []Parser
}
func (self ShortCircuitParser) Match(values []string) ([]string, bool) {
remainingValues := values
for _, parser := range self.parsers {
var ok bool
remainingValues, ok = parser.Match(remainingValues)
if ok {
return remainingValues, true
}
}
return remainingValues, false
}
func (self ShortCircuitParser) Capture(values []string) ([]string, map[string]string) {
if len(self.parsers) == 0 {
return values, nil
}
for _, parser := range self.parsers {
if _, ok := parser.Match(values); ok {
return parser.Capture(values)
}
}
// No parsers matched at this point,
// just return the capture value of the first one
return self.parsers[0].Capture(values)
}
func (self ShortCircuitParser) String() string {
return fmt.Sprintf("ShortCircuitParser %v", self.parsers)
}
|
