mirror of https://gitea.com/gitea/tea.git
128 lines
2.5 KiB
Go
128 lines
2.5 KiB
Go
package emoji
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import (
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"fmt"
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"regexp"
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"strings"
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"unicode"
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)
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var (
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flagRegex = regexp.MustCompile(`^:flag-([a-zA-Z]{2}):$`)
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)
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// Parse replaces emoji aliases (:pizza:) with unicode representation.
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func Parse(input string) string {
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var matched strings.Builder
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var output strings.Builder
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for _, r := range input {
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// when it's not `:`, it might be inner or outer of the emoji alias
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if r != ':' {
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// if matched is empty, it's the outer of the emoji alias
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if matched.Len() == 0 {
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output.WriteRune(r)
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continue
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}
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matched.WriteRune(r)
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// if it's space, the alias's not valid.
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// reset matched for breaking the emoji alias
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if unicode.IsSpace(r) {
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output.WriteString(matched.String())
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matched.Reset()
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}
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continue
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}
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// r is `:` now
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// if matched is empty, it's the beginning of the emoji alias
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if matched.Len() == 0 {
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matched.WriteRune(r)
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continue
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}
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// it's the end of the emoji alias
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match := matched.String()
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alias := match + ":"
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// check for emoji alias
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if code, ok := Find(alias); ok {
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output.WriteString(code)
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matched.Reset()
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continue
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}
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// not found any emoji
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output.WriteString(match)
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// it might be the beginning of the another emoji alias
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matched.Reset()
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matched.WriteRune(r)
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}
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// if matched not empty, add it to output
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if matched.Len() != 0 {
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output.WriteString(matched.String())
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matched.Reset()
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}
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return output.String()
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}
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// Map returns the emojis map.
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// Key is the alias of the emoji.
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// Value is the code of the emoji.
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func Map() map[string]string {
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return emojiMap
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}
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// AppendAlias adds new emoji pair to the emojis map.
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func AppendAlias(alias, code string) error {
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if c, ok := emojiMap[alias]; ok {
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return fmt.Errorf("emoji already exist: %q => %+q", alias, c)
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}
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for _, r := range alias {
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if unicode.IsSpace(r) {
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return fmt.Errorf("emoji alias is not valid: %q", alias)
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}
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}
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emojiMap[alias] = code
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return nil
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}
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// Exist checks existence of the emoji by alias.
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func Exist(alias string) bool {
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_, ok := Find(alias)
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return ok
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}
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// Find returns the emoji code by alias.
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func Find(alias string) (string, bool) {
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if code, ok := emojiMap[alias]; ok {
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return code, true
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}
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if flag := checkFlag(alias); len(flag) > 0 {
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return flag, true
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}
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return "", false
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}
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// checkFlag finds flag emoji for `flag-[CODE]` pattern
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func checkFlag(alias string) string {
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if matches := flagRegex.FindStringSubmatch(alias); len(matches) == 2 {
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flag, _ := CountryFlag(matches[1])
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return flag.String()
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}
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return ""
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}
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