libfic: New function to analyze number flag

libfic/flag_key.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"regexp"
 	"sort"
+	"strconv"
 	"strings"
 	"time"
 
@@ -47,6 +48,43 @@ type FlagKey struct {
 	BonusGain int32 `json:"bonus_gain"`
 }
 
+func AnalyzeNumberFlag(t string) (min, max, step *float64, err error) {
+	fields := strings.Split(t, ",")
+
+	if len(fields) != 4 || fields[0] != "number" {
+		err = errors.New("this is not a flag of type 'number'")
+		return
+	}
+
+	if len(fields[1]) > 0 {
+		min = new(float64)
+		*min, err = strconv.ParseFloat(fields[1], 64)
+		if err != nil {
+			return
+		}
+	}
+
+	if len(fields[2]) > 0 {
+		max = new(float64)
+		*max, err = strconv.ParseFloat(fields[2], 64)
+		if err != nil {
+			return
+		}
+	}
+
+	if len(fields[3]) > 0 {
+		step = new(float64)
+		*step, err = strconv.ParseFloat(fields[3], 64)
+		if err != nil {
+			return
+		}
+	} else {
+		*step = 1
+	}
+
+	return
+}
+
 // GetFlagKeys returns a list of key's flags comming with the challenge.
 func (e *Exercice) GetFlagKeys() ([]*FlagKey, error) {
 	if rows, err := DBQuery("SELECT id_flag, id_exercice, ordre, label, type, placeholder, help, unit, ignorecase, notrim, multiline, validator_regexp, sort_re_grps, cksum, choices_cost, bonus_gain FROM exercice_flags WHERE id_exercice = ?", e.Id); err != nil {