56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
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package dice
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import (
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"errors"
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"fmt"
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"regexp"
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"strings"
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)
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type RollResult interface {
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fmt.Stringer
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Description() string
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Int() int
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}
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type roller interface {
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Pattern() *regexp.Regexp
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Roll([]string) (RollResult, error)
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}
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type basicRollResult struct {
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desc string
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}
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func (r basicRollResult) Description() string { return strings.Trim(r.desc, " \t\r\n") }
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var rollHandlers []roller
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func addRollHandler(handler roller) {
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rollHandlers = append(rollHandlers, handler)
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}
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/*
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open - regexp.MustCompile(`([0-9]+)d([0-9]+)(e)?o$`)
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sil - regexp.MustCompile(`([0-9]+)d([0-9]+)(e)?s$`)
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*/
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func Roll(desc string) (RollResult, string, error) {
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for _, rollHandler := range rollHandlers {
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rollHandler.Pattern().Longest()
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if r := rollHandler.Pattern().FindStringSubmatch(desc); r != nil {
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result, err := rollHandler.Roll(r)
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if err != nil {
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return nil, "", err
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}
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indexes := rollHandler.Pattern().FindStringSubmatchIndex(desc)
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reason := strings.Trim(desc[indexes[0]+len(r[0]):], " \t\r\n")
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return result, reason, nil
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}
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}
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return nil, "", errors.New("Bad roll format: " + desc)
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}
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