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format.go
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format.go
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package entity
import (
"reflect"
"strings"
"unicode/utf8"
"github.com/gotd/td/tg"
)
// Builder builds message string and text entities.
type Builder struct {
entities []tg.MessageEntityClass
message strings.Builder
}
// GrowText grows internal buffer capacity.
func (b *Builder) GrowText(n int) {
b.message.Grow(n)
}
// GrowEntities grows internal buffer capacity.
func (b *Builder) GrowEntities(n int) {
if n < 0 {
panic("entity.Builder.GrowEntities: negative count")
}
buf := make([]tg.MessageEntityClass, len(b.entities), 2*cap(b.entities)+n)
copy(buf, b.entities)
b.entities = buf
}
func (b *Builder) reset() {
b.message.Reset()
b.entities = nil
}
// Complete returns build result and resets builder.
func (b *Builder) Complete() (string, []tg.MessageEntityClass) {
msg := b.message.String()
entities := b.entities
b.reset()
if len(entities) == 0 {
return msg, nil
}
if len(entities) > 1 {
last := entities[len(entities)-1]
offset := last.GetOffset()
entityText := msg[offset : offset+last.GetLength()]
trimed := strings.TrimSpace(entityText)
if len(trimed) != len(entityText) {
reflect.ValueOf(&entities[len(entities)-1]).Elem().Elem().Elem().
FieldByName("Length").
SetInt(int64(len(trimed)))
}
}
return msg, entities
}
type formatter func(offset, limit int) tg.MessageEntityClass
func (b *Builder) appendMessage(s string, format formatter) *Builder {
offset := b.message.Len()
if offset == 0 { // This is a first line.
s = strings.TrimSpace(s)
}
length := utf8.RuneCountInString(s)
b.entities = append(b.entities, format(offset, length))
b.message.WriteString(s)
return b
}
// Plain formats message as plain text.
func (b *Builder) Plain(s string) *Builder {
b.message.WriteString(s)
return b
}
// Mention formats message as Mention message entity.
// See https://core.telegram.org/constructor/messageEntityMention.
func (b *Builder) Mention(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityMention{Offset: offset, Length: limit}
})
}
// Hashtag formats message as Hashtag message entity.
// See https://core.telegram.org/constructor/messageEntityHashtag.
func (b *Builder) Hashtag(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityHashtag{Offset: offset, Length: limit}
})
}
// BotCommand formats message as BotCommand message entity.
// See https://core.telegram.org/constructor/messageEntityBotCommand.
func (b *Builder) BotCommand(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityBotCommand{Offset: offset, Length: limit}
})
}
// URL formats message as Url message entity.
// See https://core.telegram.org/constructor/messageEntityUrl.
func (b *Builder) URL(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityURL{Offset: offset, Length: limit}
})
}
// Email formats message as Email message entity.
// See https://core.telegram.org/constructor/messageEntityEmail.
func (b *Builder) Email(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityEmail{Offset: offset, Length: limit}
})
}
// Bold formats message as Bold message entity.
// See https://core.telegram.org/constructor/messageEntityBold.
func (b *Builder) Bold(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityBold{Offset: offset, Length: limit}
})
}
// Italic formats message as Italic message entity.
// See https://core.telegram.org/constructor/messageEntityItalic.
func (b *Builder) Italic(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityItalic{Offset: offset, Length: limit}
})
}
// Code formats message as Code message entity.
// See https://core.telegram.org/constructor/messageEntityCode.
func (b *Builder) Code(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityCode{Offset: offset, Length: limit}
})
}
// Pre formats message as Pre message entity.
// See https://core.telegram.org/constructor/messageEntityPre.
func (b *Builder) Pre(s, lang string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityPre{Offset: offset, Length: limit, Language: lang}
})
}
// TextURL formats message as TextUrl message entity.
// See https://core.telegram.org/constructor/messageEntityTextUrl.
func (b *Builder) TextURL(s, url string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityTextURL{Offset: offset, Length: limit, URL: url}
})
}
// MentionName formats message as MentionName message entity.
// See https://core.telegram.org/constructor/messageEntityMentionName.
func (b *Builder) MentionName(s string, userID int) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityMentionName{Offset: offset, Length: limit, UserID: userID}
})
}
// Phone formats message as Phone message entity.
// See https://core.telegram.org/constructor/messageEntityPhone.
func (b *Builder) Phone(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityPhone{Offset: offset, Length: limit}
})
}
// Cashtag formats message as Cashtag message entity.
// See https://core.telegram.org/constructor/messageEntityCashtag.
func (b *Builder) Cashtag(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityCashtag{Offset: offset, Length: limit}
})
}
// Underline formats message as Underline message entity.
// See https://core.telegram.org/constructor/messageEntityUnderline.
func (b *Builder) Underline(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityUnderline{Offset: offset, Length: limit}
})
}
// Strike formats message as Strike message entity.
// See https://core.telegram.org/constructor/messageEntityStrike.
func (b *Builder) Strike(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityStrike{Offset: offset, Length: limit}
})
}
// Blockquote formats message as Blockquote message entity.
// See https://core.telegram.org/constructor/messageEntityBlockquote.
func (b *Builder) Blockquote(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityBlockquote{Offset: offset, Length: limit}
})
}
// BankCard formats message as formats message entity.
// See https://core.telegram.org/constructor/messageEntityBankCard.
func (b *Builder) BankCard(s string) *Builder {
return b.appendMessage(s, func(offset, limit int) tg.MessageEntityClass {
return &tg.MessageEntityBankCard{Offset: offset, Length: limit}
})
}