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|
package cli
import (
"fmt"
"regexp"
"strings"
)
type Flags map[string][]Flag
var handlers []*Handler
type Handler struct {
Pattern string
Flags Flags
Callback func(Context)
Description string
}
func (self *Handler) getParser() Parser {
var parsers []Parser
for _, pattern := range splitPattern(self.Pattern) {
if isOptional(pattern) {
name := optionalName(pattern)
parser := getFlagParser(self.Flags[name])
parsers = append(parsers, parser)
} else if isCaptureGroup(pattern) {
parsers = append(parsers, CaptureGroupParser{pattern})
} else {
parsers = append(parsers, EqualParser{pattern})
}
}
return CompleteParser{parsers}
}
func SetHandlers(h []*Handler) {
handlers = h
}
func AddHandler(pattern string, flags Flags, callback func(Context), desc string) {
handlers = append(handlers, &Handler{
Pattern: pattern,
Flags: flags,
Callback: callback,
Description: desc,
})
}
func findHandler(args []string) *Handler {
for _, h := range handlers {
if _, ok := h.getParser().Match(args); ok {
return h
}
}
return nil
}
func Handle(args []string) bool {
h := findHandler(args)
if h == nil {
return false
}
_, data := h.getParser().Capture(args)
fmt.Println(data)
ctx := Context{
args: data,
handlers: handlers,
}
h.Callback(ctx)
return true
}
func filterHandlers(handlers []*Handler, prefix string) []*Handler {
matches := []*Handler{}
for _, h := range handlers {
pattern := strings.Join(stripOptionals(splitPattern(h.Pattern)), " ")
if strings.HasPrefix(pattern, prefix) {
matches = append(matches, h)
}
}
return matches
}
// Split on spaces but ignore spaces inside <...> and [...]
func splitPattern(pattern string) []string {
re := regexp.MustCompile(`(<[^>]+>|\[[^\]]+]|\S+)`)
matches := []string{}
for _, value := range re.FindAllStringSubmatch(pattern, -1) {
matches = append(matches, value[1])
}
return matches
}
func isCaptureGroup(arg string) bool {
return strings.HasPrefix(arg, "<") && strings.HasSuffix(arg, ">")
}
func isOptional(arg string) bool {
return strings.HasPrefix(arg, "[") && strings.HasSuffix(arg, "]")
}
func optionalName(s string) string {
return s[1:len(s) - 1]
}
// Strip optional groups from pattern
func stripOptionals(pattern []string) []string {
newArgs := []string{}
for _, arg := range pattern {
if !isOptional(arg) {
newArgs = append(newArgs, arg)
}
}
return newArgs
}
|
