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builtin.go
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builtin.go
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package gctrl
import (
"bytes"
"errors"
"fmt"
"regexp"
"sort"
"strings"
"text/tabwriter"
)
func (this *Controller) registerBuiltInFuncs() {
this.MustRegister(this.listFuncs, "_list", "return registered function list "+
"(case insensitive, wildcard '*' supported)")
}
func (this *Controller) listFuncs(name string) (string, error) {
metaList, err := filterFuncs(this.funcMap, name)
if err != nil {
return "", err
}
if len(metaList) == 0 {
return "", errors.New("no results")
}
sort.Slice(metaList, func(i int, j int) bool {
return metaList[i].name < metaList[j].name
})
sort.SliceStable(metaList, func(i int, j int) bool {
return strings.ToLower(metaList[i].name) < strings.ToLower(metaList[j].name)
})
return formatFuncList(metaList), nil
}
func filterFuncs(funcMap map[string]*funcMeta, arg string) ([]*funcMeta, error) {
var exp string
if arg != "" {
exp = `(?i)\b` + strings.Replace(arg, "*", ".*", -1) + `\b`
}
reg, err := regexp.Compile(exp)
if err != nil {
return nil, fmt.Errorf("invalid argument '%s'", arg)
}
var metaList []*funcMeta
for name, meta := range funcMap {
if reg.MatchString(name) {
metaList = append(metaList, meta)
}
}
return metaList, nil
}
func formatFuncList(metaList []*funcMeta) string {
var buf bytes.Buffer
tw := tabwriter.NewWriter(&buf, 0, 0, 4, ' ', 0)
for _, meta := range metaList {
fmt.Fprintf(tw, "\n%s\t%v\t// %s", meta.name, meta.fn.Type(), meta.desc)
}
tw.Flush()
return buf.String()
}