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viettranx
31ba182b40
Zalo API does not support any markup rendering. LLM output containing markdown artifacts (**bold**, `code`, headers, etc.) was sent as-is, making messages hard to read. Add StripMarkdown() to convert markdown to clean plain text, and inject a system prompt hint instructing the model to output plain text on Zalo channels.
73 lines
2.4 KiB
Go
73 lines
2.4 KiB
Go
package zalo
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import (
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"regexp"
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"strings"
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)
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// StripMarkdown removes markdown formatting artifacts from text, producing
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// clean plain text suitable for Zalo which does not support any markup.
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func StripMarkdown(text string) string {
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if text == "" {
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return text
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}
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// 1. Strip fenced code blocks — keep content, remove ``` delimiters
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text = reFencedCode.ReplaceAllString(text, "$1")
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// 2. Strip inline code backticks
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text = reInlineCode.ReplaceAllString(text, "$1")
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// 3. Strip images  — remove entirely
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text = reImage.ReplaceAllString(text, "")
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// 4. Strip links [text](url) → text (url)
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text = reLink.ReplaceAllString(text, "$1 ($2)")
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// 5. Strip bold+italic (***text*** or ___text___)
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text = reBoldItalicStar.ReplaceAllString(text, "$1")
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text = reBoldItalicUnder.ReplaceAllString(text, "$1")
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// 6. Strip bold (**text** or __text__)
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text = reBoldStar.ReplaceAllString(text, "$1")
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text = reBoldUnder.ReplaceAllString(text, "$1")
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// 7. Strip strikethrough ~~text~~
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text = reStrikethrough.ReplaceAllString(text, "$1")
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// 8. Strip headers (lines starting with #)
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text = reHeader.ReplaceAllString(text, "$1")
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// 9. Strip horizontal rules
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text = reHorizontalRule.ReplaceAllString(text, "")
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// 10. Strip blockquotes
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text = reBlockquote.ReplaceAllString(text, "$1")
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// 11. Replace bullet markers with •
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text = reBullet.ReplaceAllString(text, "${1}• ")
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// Clean up excessive blank lines (3+ → 2)
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text = reExcessiveNewlines.ReplaceAllString(text, "\n\n")
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return strings.TrimSpace(text)
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}
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var (
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reFencedCode = regexp.MustCompile("(?s)```[a-zA-Z0-9]*\\n?(.*?)```")
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reInlineCode = regexp.MustCompile("`([^`]+)`")
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reImage = regexp.MustCompile(`!\[[^\]]*\]\([^)]+\)`)
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reLink = regexp.MustCompile(`\[([^\]]+)\]\(([^)]+)\)`)
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reBoldItalicStar = regexp.MustCompile(`\*{3}(.+?)\*{3}`)
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reBoldItalicUnder = regexp.MustCompile(`_{3}(.+?)_{3}`)
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reBoldStar = regexp.MustCompile(`\*{2}(.+?)\*{2}`)
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reBoldUnder = regexp.MustCompile(`_{2}(.+?)_{2}`)
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reStrikethrough = regexp.MustCompile(`~~(.+?)~~`)
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reHeader = regexp.MustCompile(`(?m)^#{1,6}\s+(.+)$`)
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reHorizontalRule = regexp.MustCompile(`(?m)^[\s]*[-*_]{3,}[\s]*$`)
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reBlockquote = regexp.MustCompile(`(?m)^>\s?(.*)$`)
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reBullet = regexp.MustCompile(`(?m)^(\s*)[-*+]\s+`)
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reExcessiveNewlines = regexp.MustCompile(`\n{3,}`)
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)
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