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matcher.go
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matcher.go
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package options
import (
"fmt"
"regexp"
"strings"
"github.com/reedom/copygen/cli/models"
)
// IsMatchOptionCategory determines if a given string is a match option category.
func IsMatchOptionCategory(c string) bool {
return c == CategoryAutomatch || c == CategoryMap || c == CategoryTag
}
// IsMatchOptionSet determines if a match option is already set for a given field.
func IsMatchOptionSet(field models.Field) bool {
return field.Options.Automatch || field.Options.Map != "" || field.Options.Tag != ""
}
const (
CategoryAutomatch = "automatch"
// FormatAutomatch represents an end-user facing format for automatch options.
// <option> refers to the "automatch" option.
FormatAutomatch = "<option>:<whitespaces><regex>"
)
// ParseAutomatch parses a automatch option.
func ParseAutomatch(option string) (*Option, error) {
splitoption := strings.Fields(option)
if len(splitoption) == 0 {
return nil, fmt.Errorf("there is an unspecified %s option at an unknown line", CategoryAutomatch)
} else if len(splitoption) != 1 {
return nil, fmt.Errorf("there is a misconfigured %s option: %q.\nIs it in format %s?", CategoryAutomatch, option, FormatAutomatch)
}
fieldRe, err := regexp.Compile("^" + splitoption[0] + "$")
if err != nil {
return nil, fmt.Errorf("an error occurred compiling the regex for the field in the %s option: %q\n%w", CategoryAutomatch, option, err)
}
return &Option{
Category: CategoryAutomatch,
Regex: map[int]*regexp.Regexp{0: fieldRe},
Value: true,
}, nil
}
// SetAutomatch sets a field's automatch option.
func SetAutomatch(field *models.Field, option Option) {
if IsMatchOptionSet(*field) {
return
}
if option.Regex[0] != nil && option.Regex[0].MatchString(field.FullNameWithoutPointer("")) {
field.Options.Automatch = true
}
}
const (
CategoryMap = "map"
// FormatMap represents an end-user facing format for map options.
// <option> refers to the "map" option.
FormatMap = "<option>:<whitespaces><regex><whitespaces><field>"
)
// ParseMap parses a map option.
func ParseMap(option string) (*Option, error) {
splitoption := strings.Fields(option)
if len(splitoption) == 0 {
return nil, fmt.Errorf("there is an unspecified %s option at an unknown line", CategoryMap)
} else if len(splitoption) != 2 {
return nil, fmt.Errorf("there is a misconfigured %s option: %q.\nIs it in format %s?", CategoryMap, option, FormatMap)
}
fromRe, err := regexp.Compile("^" + splitoption[0] + "$")
if err != nil {
return nil, fmt.Errorf("an error occurred compiling the regex for the from field in the %s option: %q\n%w", CategoryMap, option, err)
}
// map options are compared in the matcher
return &Option{
Category: CategoryMap,
Regex: map[int]*regexp.Regexp{0: fromRe},
Value: splitoption[1],
}, nil
}
// SetMap sets a field's map option.
func SetMap(field *models.Field, option Option) {
if IsMatchOptionSet(*field) {
return
}
if option.Regex[0] != nil && option.Regex[0].MatchString(field.FullNameWithoutPointer("")) {
if value, ok := option.Value.(string); ok {
field.Options.Map = value
}
}
}
const (
CategoryTag = "tag"
// FormatTag represents an end-user facing format for tag options.
// <option> refers to the "tag" option.
FormatTag = "<option>:<whitespaces><regex><whitespaces><tag>"
)
// ParseTag parses a tag option.
func ParseTag(option string) (*Option, error) {
splitoption := strings.Fields(option)
if len(splitoption) == 0 {
return nil, fmt.Errorf("there is an unspecified %s option at an unknown line", CategoryTag)
} else if len(splitoption) != 2 {
return nil, fmt.Errorf("there is a misconfigured %s option: %q.\nIs it in format %s?", CategoryTag, option, FormatTag)
}
fieldRe, err := regexp.Compile("^" + splitoption[0] + "$")
if err != nil {
return nil, fmt.Errorf("an error occurred compiling the regex for the field in the %s option: %q\n%w", CategoryTag, option, err)
}
return &Option{
Category: CategoryTag,
Regex: map[int]*regexp.Regexp{0: fieldRe},
Value: splitoption[1],
}, nil
}
// SetTag sets a field's tag option.
func SetTag(field *models.Field, option Option) {
if IsMatchOptionSet(*field) {
return
}
if option.Regex[0] != nil && option.Regex[0].MatchString(field.FullNameWithoutPointer("")) {
if optionvalue, ok := option.Value.(string); ok {
for tagcat, tagmeta := range field.Tags {
// match the tag by it's category.
// i.e api == api in `api:"id"`.
if optionvalue == tagcat {
// gets the name of any valid tag.
// i.e `api:id` in `api:"id", api:"name"` (invalid).
for tagname := range tagmeta {
field.Options.Tag = tagcat + ":" + tagname
return
}
}
}
}
}
}