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parse_mode.go
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parse_mode.go
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package tg
import (
"encoding"
"fmt"
"html"
"regexp"
"strings"
)
type ParseMode interface {
encoding.TextMarshaler
fmt.Stringer
// Change separator for next calls
Sep(v string) ParseMode
// Text joins the given strings with new line seprator
Text(v ...string) string
// Line joins the given strings with space seprator
Line(v ...string) string
// Bold
Bold(v ...string) string
// Italic
Italic(v ...string) string
// Underline
Underline(v ...string) string
// Deleted (Striketrough)
Strike(v ...string) string
// Spoiler
Spoiler(v ...string) string
// Link
Link(title, url string) string
// Code
Code(v ...string) string
// Preformated text
Pre(v ...string) string
// Escape
Escape(v string) string
}
func regexpReplacer(re *regexp.Regexp, repl string) func(string) string {
return func(s string) string {
return re.ReplaceAllString(s, repl)
}
}
var (
// HTML is ParseMode that uses HTML tags
HTML ParseMode = parseMode{
name: "HTML",
separator: " ",
bold: parseModeTag{"<b>", "</b>"},
italic: parseModeTag{"<i>", "</i>"},
underline: parseModeTag{"<u>", "</u>"},
strike: parseModeTag{"<s>", "</s>"},
spoiler: parseModeTag{"<tg-spoiler>", "</tg-spoiler>"},
code: parseModeTag{"<code>", "</code>"},
pre: parseModeTag{"<pre>", "</pre>"},
linkTemplate: `<a href="{url}">{title}</a>`,
escape: html.EscapeString,
}
// MD is ParseMode that uses Markdown tags.
// Warning: this is legacy mode, use MarkdownV2 (MD2) instead.
MD ParseMode = parseMode{
name: "Markdown",
separator: " ",
bold: parseModeTag{"*", "*"},
italic: parseModeTag{"_", "_"},
code: parseModeTag{"`", "`"},
pre: parseModeTag{"```", "```"},
linkTemplate: `[{title}]({url})`,
escape: regexpReplacer(regexp.MustCompile(`([_*\x60\[])`), `\$1`),
}
// MD2 is ParseMode that uses MarkdownV2 tags.
MD2 ParseMode = parseMode{
name: "MarkdownV2",
separator: " ",
bold: parseModeTag{"*", "*"},
italic: parseModeTag{"_", "_"},
underline: parseModeTag{"__", "__"},
strike: parseModeTag{"~", "~"},
spoiler: parseModeTag{"||", "||"},
code: parseModeTag{"`", "`"},
pre: parseModeTag{"```", "```"},
linkTemplate: `[{title}]({url})`,
escape: regexpReplacer(regexp.MustCompile(`([_*\[\]()~\x60>#\+\-=|{}.!])`), `\$1`),
}
)
type parseMode struct {
separator string
name string
bold parseModeTag
italic parseModeTag
underline parseModeTag
strike parseModeTag
spoiler parseModeTag
code parseModeTag
pre parseModeTag
linkTemplate string
escape func(string) string
}
type parseModeTag struct {
start string
end string
}
func (pmt parseModeTag) wrap(content string) string {
return pmt.start + content + pmt.end
}
func (pm parseMode) Text(v ...string) string {
return strings.Join(v, "\n")
}
func (pm parseMode) Line(v ...string) string {
return strings.Join(v, " ")
}
func (pm parseMode) MarshalText() ([]byte, error) {
return []byte(pm.String()), nil
}
func (pm parseMode) String() string {
return pm.name
}
func (pm parseMode) Sep(sep string) ParseMode {
pm.separator = sep
return pm
}
// Bold
func (pm parseMode) Bold(v ...string) string {
return pm.bold.wrap(strings.Join(v, pm.separator))
}
// Italic
func (pm parseMode) Italic(v ...string) string {
return pm.italic.wrap(strings.Join(v, pm.separator))
}
// Underline. Warning: this is not supported by Markdown, use MarkdownV2.
func (pm parseMode) Underline(v ...string) string {
return pm.underline.wrap(strings.Join(v, pm.separator))
}
// Strike. Warning: this is not supported by Markdown, use MarkdownV2.
func (pm parseMode) Strike(v ...string) string {
return pm.strike.wrap(strings.Join(v, pm.separator))
}
// Spoiler. Warning: this is not supported by Markdown, use MarkdownV2.
func (pm parseMode) Spoiler(v ...string) string {
return pm.spoiler.wrap(strings.Join(v, pm.separator))
}
// Link
func (pm parseMode) Link(title string, url string) string {
return strings.NewReplacer(
"{title}", title,
"{url}", url,
).Replace(pm.linkTemplate)
}
// Code
func (pm parseMode) Code(v ...string) string {
return pm.code.wrap(strings.Join(v, pm.separator))
}
// Preformated text
func (pm parseMode) Pre(v ...string) string {
return pm.pre.wrap(strings.Join(v, pm.separator))
}
func (pm parseMode) Escape(v string) string {
return pm.escape(v)
}