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cli.go
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cli.go
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package cli
import (
"github.com/c-bata/go-prompt"
"github.com/sunist-c/genius-invokation-simulator-cli/advisor"
"strings"
)
// Completer go-prompt的提示接口
func Completer(d prompt.Document) []prompt.Suggest {
return Complete(d, rootAdvisor, parseArgs(d.TextBeforeCursor()))
}
// parseArgs 解析当前命令行参数,分割为若干个字符串
func parseArgs(arg string) []string {
splits := strings.Split(arg, " ")
args := make([]string, 0, len(splits))
for i := range splits {
if i != len(splits)-1 && splits[i] == "" {
continue
}
args = append(args, splits[i])
}
return args
}
// Complete 递归解析Advisor的语法树结构,进行提示,O(n)
func Complete(d prompt.Document, adv advisor.Advisor, args []string) (suggestions []prompt.Suggest) {
adv.SyncDocument(&d)
if len(args) <= 1 {
return adv.Suggestions()
}
for len(args) > 1 {
if nextAdvisor := adv.ParseEntrance(args[0]); nextAdvisor != nil {
return Complete(d, nextAdvisor, args[1:])
} else {
invalidAdvisor := advisor.InvalidAdvisor()
invalidAdvisor.SyncDocument(&d)
return invalidAdvisor.Suggestions()
}
}
invalidAdvisor := advisor.InvalidAdvisor()
invalidAdvisor.SyncDocument(&d)
return invalidAdvisor.Suggestions()
}
// FindHandler 递归解析Advisor的语法树结构,查找命令的执行函数,O(n)
func FindHandler(adv advisor.Advisor, args []string) (handler func(argument string)) {
defer func() {
if handler == nil {
logger.Errorf("no handler detected")
handler = func(argument string) {}
}
}()
if len(args) <= 1 {
return adv.Handler()
}
for len(args) > 1 {
if nextAdvisor := adv.ParseEntrance(args[0]); nextAdvisor != nil {
return FindHandler(nextAdvisor, args[1:])
} else {
return adv.Handler()
}
}
return adv.Handler()
}