70 lines
1.1 KiB
Go
70 lines
1.1 KiB
Go
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package importas
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import (
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"errors"
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"fmt"
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"regexp"
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)
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type Config struct {
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RequiredAlias map[string]string
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Rules []*Rule
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DisallowUnaliased bool
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}
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func (c *Config) CompileRegexp() error {
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rules := make([]*Rule, 0, len(c.RequiredAlias))
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for path, alias := range c.RequiredAlias {
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reg, err := regexp.Compile(fmt.Sprintf("^%s$", path))
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if err != nil {
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return err
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}
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rules = append(rules, &Rule{
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Regexp: reg,
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Alias: alias,
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})
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}
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c.Rules = rules
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return nil
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}
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func (c *Config) findRule(path string) *Rule {
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for _, rule := range c.Rules {
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if rule.Regexp.MatchString(path) {
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return rule
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}
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}
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return nil
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}
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func (c *Config) AliasFor(path string) (string, bool) {
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rule := c.findRule(path)
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if rule == nil {
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return "", false
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}
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alias, err := rule.aliasFor(path)
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if err != nil {
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return "", false
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}
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return alias, true
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}
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type Rule struct {
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Alias string
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Regexp *regexp.Regexp
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}
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func (r *Rule) aliasFor(path string) (string, error) {
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str := r.Regexp.FindString(path)
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if len(str) > 0 {
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return r.Regexp.ReplaceAllString(str, r.Alias), nil
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}
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return "", errors.New("mismatch rule")
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}
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